JP5925487B2 - Hinge cap with elastic piece - Google Patents

Description

  The present invention relates to a cap capable of pouring the contents of a container without removing it from the container, and in particular, a hinge cap having an elastic piece integrally formed from a synthetic resin characterized by a hinge mechanism used for the cap. About.

  Containers are usually used for storing or transporting articles or materials. The contents of the container include various things such as viscous liquid materials such as mayonnaise, ketchup, sauce and jelly, liquid materials having relatively high fluidity such as juice and alcoholic beverages, and granular materials. There are a wide variety of container shapes in overall shape and partial shape, and metal, synthetic resin, rubber, paper, ceramics, glass, etc. are used as the material of the container, and these composites and laminates are also used. used.

  For example, as a synthetic resin container, a direct blow molded container obtained by extruding a synthetic resin cylindrical parison and then blow-molding into a container shape in a molding die, or an injection obtained by injection molding Molded containers and the like are known. The layer structure of the synthetic resin container includes a single layer container or a multilayer container, and the synthetic resin material includes polyolefin such as polyethylene and polypropylene, polyester such as polyethylene terephthalate, polyamide such as nylon, and the like. . As a multilayer synthetic resin container, a multi-layer structure having polyolefin as a surface layer (outer layer and / or inner layer) and a barrier layer such as an ethylene / vinyl alcohol copolymer (EVOH) as an intermediate layer is used. Widely used.

  Examples of the metal container include a container formed by winding a thin metal plate such as aluminum or steel into a substantially cylindrical shape, or a metal thick plate formed by deep drawing in a substantially cup shape. In addition, as the paper container, there is a paper container in which a plate-shaped paper material is wound to have a substantially cylindrical shape or a prism shape.

  Among these containers, containers (hereinafter sometimes referred to as “bottles”) having a neck having a smaller diameter than the trunk (hereinafter also referred to as “mouth neck”) are known, and usually the top part. (It means the upper part when the bottle is set upright.) Has an opening for filling or pouring the contents. A lid or cap (hereinafter sometimes collectively referred to as “cap”) having the same diameter as the neck (mouth neck) of the container is attached to the opening. As a material for the cap, metal, synthetic resin, paper, or the like, or a composite material or a laminated material thereof is used.

  As caps attached to the openings, there are a cap that can be removed from the container to pour out the contents of the container and a cap that can pour out the contents of the container without removing it from the container.

  As shown in FIG. 1, the cap body (1) attached to the mouth-and-neck portion of the container and the overcap covering the top of the cap body (as shown in FIG. 1) can be poured out without removing from the container. 2) and a hinge cap provided with a hinge mechanism (3) for connecting the overcap (2) to the cap body (1) so as to be swingable between a closed state and an open state. ing. In general, the inner peripheral surface of the cap body (1) is provided with a screw portion (1a) for screwing with the outer peripheral surface of the mouth neck portion of the container, and the outer peripheral surface is knurled to prevent slipping ( It is also referred to as “notch processing” (not shown).

  The hinge cap swings the overcap (2) about the swing axis of the hinge mechanism (3) to open the cover, as shown in FIG. A spout (4) for pouring the contents can be formed. Such a hinge cap is widely used as a container cap for liquid seasonings and the like in recent years because it is not necessary to remove the entire cap from the container when the contents of the container are poured out. It can be integrally molded from a synthetic resin.

  As a hinge mechanism (3) of the hinge cap, a mechanism called a so-called three-point hinge mechanism is known (Patent Documents 1 to 3). As shown in FIG. 3, the three-point hinge mechanism includes a hinge body (3a) that connects the cap body (1) and the overcap (2) to each other so as to be able to swing, and overcaps (2 ) In a closed state or in an open state, the pair of elastic pieces (3b) is used.

  In the hinge mechanism (3) of the three-point hinge mechanism (hereinafter sometimes referred to as “three-point hinge mechanism (3)”), when the overcap (2) is swung from the open state to the closed state, the overcap Until the cap (2) reaches a predetermined position (sometimes referred to as “thought point” or “dead point”), the elastic piece (3b) gradually extends, and in this process, the overcap (2) is You will feel resistance to swing. When the overcap (2) exceeds the speculative point, the elastic piece (3b) contracts by its own elastic restoring force and pulls the overcap (2) in the direction of the closed state. Feeling of resistance (click feeling) when the overcap (2) crosses the thought point, operating characteristics when moving from the thought point to the closed state, or moving from the thought point to the open state (snap property) ) Is determined by the size, elastic modulus, elongation and the like of the elastic piece. When the tensile force at the thought point has a certain level, the snapping property or the click feeling is good. If the tensile force at the thought point is too large, it will be difficult to open and close the overcap (2). On the other hand, if the tensile force at the thought point is too small, the overcap (2) will not open and close clearly. The cap (2) may not be reliably closed.

  However, if the tensile force by the elastic piece (3b) is excessively increased in order to improve the snapping or clicking feeling of the three-point hinge mechanism (3), the stress generated in the elastic piece (3b) increases. Moreover, since the elastic piece (3b) has different elongation amounts between the side close to the hinge body (3a) and the opposite side, the stress distribution tends to be non-uniform. Furthermore, twisting and local stress concentration may occur in the elastic piece (3b) depending on the connection state and position. The twist, large stress and stress concentration of the elastic piece (3b) cause early fatigue damage of the elastic piece (3b).

  In order to suppress the twist of the elastic piece (3b), the entire three-point hinge mechanism (3) protrudes outward from the side surfaces of the overcap (2) and the cap body (1), or a large stress is generated. However, the area of the elastic piece (3b) may be increased so that the durability is maintained. However, when the hinge mechanism (3) is protruded or the elastic piece (3b) is enlarged, the fingertip hits the hinge mechanism (3), which impairs the operability of the cap. Therefore, for example, in Patent Document 4, each end of the elastic piece (3b) is joined along the outer peripheral surface of the cap skirt (corresponding to “cap body (1)”) and the overcap (2). A hinge cap provided with a hinge mechanism (3) with good snapping, durability, and operability is disclosed in which the thickness of the elastic piece (3b) is gradually increased toward the end.

  As with other lids and caps, the hinge cap is used after the contents are filled into the container in the manufacturing process of the container filled with the contents (hereinafter sometimes referred to as “filled container”). It is attached to the mouth and neck. As an apparatus for attaching a cap to a container, for example, an apparatus as shown in FIG. 7 is known (Patent Document 4). In this apparatus, caps (c) sequentially fed from a cap supply unit (hereinafter sometimes referred to as “hopper”) not shown are aligned by cap supply means (d) such as an inclined chute. The caps (c) are transferred to the capper (e) one by one through the cap support device (D) that is a transfer device. The capper (e) grips the cap (c) with the gripper (f), moves to above the filling container (b), and then moves the cap (c) gripped by the gripper (f) to the filling container (b). The cap (c) is fitted or screwed to the mouth and neck while being brought into contact with the mouth and neck. Next, usually, the cap (c) held by the gripper (f) is rotated, so that the cap (c) is screwed into the mouth-neck portion of the filling container (b) and attached to the mouth-neck portion, and the gripper (f ) Is released from the cap (c), and the filled container (b) to which the cap (c) is attached is manufactured. As the cap supply means (d), in addition to the inclined one shown in the figure, one that supplies the cap (c) almost vertically, one that supplies the cap (c) by rotating the sprocket or gear, Various devices are known, such as those that transport c) in parallel and those that transport caps (c) stacked one above the other, and have various diameters, shapes, or lengths, such as chutes. Are known.

  In recent years, in order to improve productivity, the speed of manufacturing apparatuses for filling containers has been increased, and the apparatus for attaching the cap (c) to the containers is also required to increase the operation speed. Accordingly, in the cap supply means (d), the cap (c) is required to be transferred while being aligned quickly and reliably.

  The hinge cap including the cap body (1), the overcap (2), and the hinge mechanism (3) is normally supplied and transferred in the cap supply means (d) in a closed state. In addition to the cap body (1) and the overcap (2), the hinge cap includes a hinge mechanism (3) that slidably connects the cap body (1) and the overcap (2). Projections or protrusions exist in c). In the cap supply means (d), the cap (c) may come into contact with or catch on the inner surface of the cap supply means (d), and the hinge mechanisms (3) of the plurality of hinge caps interfere with each other. In some cases, quick and reliable alignment and transfer are difficult to perform.

  In particular, the hinge mechanism (3) is a three-point hinge mechanism including a hinge body (3a) and a pair of elastic pieces (3b). And the cap body (1) may protrude outward from the side surface, or the area of the elastic piece (3b) may be increased. In addition, there are cases where it is difficult to transport while aligning reliably. Accordingly, in the hinge cap in which the hinge mechanism (3) is a three-point hinge mechanism, in addition to the above-described problem that the fingertip hits the hinge mechanism (3) and impairs the operability of the cap, Quick and reliable alignment and sliding transfer are difficult, and the posture and position of the cap (c) delivered to the capper (e) are out of a predetermined range. In some cases, the hinge is provided in the cap supply means (d). Since the cap is clogged or the supply of the cap (c) to the capper (e) is delayed, the production device for the filling container (b) may be stopped. There is also a need for sexual resolution.

  On the other hand, for synthetic resin containers, a lubricant (slip agent) is added to the raw material resin in order to improve the slipperiness of the inner and outer surfaces of the container (Patent Document 5). The lubricant is usually added to a raw material resin by a master batch method or kneaded. When the synthetic resin container is a multilayer container, a lubricant is often added to the surface layer (outermost layer or innermost layer). As the lubricant, for example, fatty acid amide is widely used, and specifically, oleic acid amide, stearic acid amide, behenic acid amide (behenic acid amide) and the like are used. These lubricants have been used in a mixture of two or more.

Japanese Patent Publication No. 3-53182 Japanese Utility Model Publication No. 63-7657 Japanese Patent Laid-Open No. 9-66955 JP-A-8-119386 Japanese Patent Laid-Open No. 6-72422

  The subject of the present invention is a three-point molded integrally from synthetic resin that has good snapping properties, durability and operability, and has good transportability in cap supply in the step of attaching the cap to the container. It is providing the hinge cap provided with a hinge mechanism.

  As a result of earnest research on solving the above-mentioned problems, the present inventors have determined that the thickness of the elastic piece of the three-point hinge mechanism is a specific one in the hinge cap formed integrally from synthetic resin, and the hinge mechanism The present inventors have found that the problem can be solved by making the composition of the resin material forming the material specific.

That is, according to the present invention, the cap body attached to the neck of the container, the overcap covering the top of the cap body, and the overcap with the cap body in a closed state and an open state A hinge cap integrally formed from a synthetic resin and having a hinge mechanism that is slidably connected between the following: a) to c):
a) The hinge mechanism is
a-1) a hinge body that rotatably supports the overcap with respect to the cap body, and a pair of elastic pieces disposed on both sides of the hinge body;
a-2) having a recess in the vicinity of the upper surface of the connecting portion between the protruding portion of the cap body and the protruding portion of the overcap along the direction of the swing axis;
b) The elastic piece is
b-1) Both ends are connected along the outer peripheral surface of the cap body and the outer peripheral surface of the overcap, respectively,
b-2) The thickness at the end is larger than the thickness at the center, and the ratio of the thickness at the end to the thickness at the center is in the range of 1.05 to 5,
b-3) The position where the thickness of the elastic piece is minimum exists between the central portion and the end portion, and the ratio of the minimum thickness of the elastic piece to the thickness of the central portion of the elastic piece is 0.7-0. in the range of .99, and, c) the hinge mechanism, Ri Do fatty acid amide having a carbon Motoni double bonds (a) from 130-4,000 ppm content to synthetic resin, all of the carbon-carbon double bond is not A hinge cap comprising an elastic piece characterized in that it is a saturated cis structure is provided. In the present invention, “molded integrally from synthetic resin” means molded integrally from a resin material containing additives and compounding agents ordinarily used in molding synthetic resins in addition to synthetic resins. Means that.

Moreover, according to this invention, a hinge cap provided with the elastic piece of following (1)-(11) is provided as an embodiment.
(1) the cap body, the overcap and the hinge mechanism, Ri Do from fatty acid amide (A) of 130 to 4000 ppm containing synthesized resin having an unsaturated cis structure carbon double bond, and all of the carbon-carbon double bond A hinge cap comprising the elastic piece , wherein is an unsaturated cis structure .
(2) The fatty acid amide (A) having the unsaturated cis structure carbon double bond is the following (A ₁ ), (A ₂ ) and (A ₃ ):
(A ₁ ) H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10);
(A ₂ ) H ₂ N—CO — (— CH ₂ —) _m−2 —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10) And (A ₃ ) H ₂ N—CO — (— CH ₂ —) _{k + 4} —CH═CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10); ;
A hinge cap comprising the elastic piece containing at least one fatty acid amide represented by one formula selected from the group consisting of:
(3) The fatty acid amide (A) having an unsaturated cis structure carbon double bond is the fatty acid amide represented by the formula (A ₁ ), and the (A ₂ ) or (A ₃ ) A hinge cap comprising the elastic piece, which is a mixture with at least one fatty acid amide represented by the formula:
(4) A hinge cap comprising the elastic piece, wherein m in the fatty acid amide represented by the formula (A ₂ ) is m = n + 1 or m = n−1.
(5) A hinge cap comprising the elastic piece, wherein k in the fatty acid amide represented by the formula (A ₃ ) is k = n.
(6) The fatty acid amide (A) having an unsaturated cis structure carbon double bond is represented by the above formula (A ₁ ) and the following (A ₁₁ ):
(A ₁₁ ) H ₂ N—CO — (— CH ₂ —) _j —CH═CH — (— CH ₂ —) _j —CH ₃ (where j is an integer in the range of 6 ≦ j ≦ 10, j ≠ n.);
A hinge cap comprising the elastic piece, which is a mixture with a fatty acid amide represented by the formula:
(7) The elastic piece, wherein the fatty acid amide (A) having an unsaturated cis structure carbon double bond contains a compound having 2 to 4 bonds of unsaturated cis structure carbon double bonds in the molecular structure. A hinge cap comprising:
(8) A hinge cap provided with the elastic piece, wherein the synthetic resin containing the fatty acid amide (A) having an unsaturated cis structure carbon double bond further contains a saturated fatty acid amide.
(9) A hinge cap provided with the elastic piece, wherein the synthetic resin contains polyolefin.
(10) A hinge cap comprising the elastic piece, wherein the polyolefin is a propylene-based resin.
(11) A hinge cap including the elastic piece that is heat-fixed in a closed state.

According to the present invention, the cap body attached to the mouth and neck of the container, the overcap covering the top of the cap body, and the overcap between the closed state and the open state with respect to the cap body A hinge cap that is integrally formed from a synthetic resin and includes a hinge mechanism that is pivotably connected, and includes the following a) to c):
a) The hinge mechanism has a hinge body that rotatably supports the overcap with respect to the cap body, and a pair of elastic pieces disposed on both sides of the hinge body,
b) The elastic piece is
b-1) Both ends are connected along the outer peripheral surface of the cap body and the outer peripheral surface of the overcap, respectively,
b-2) The thickness at the end is greater than the thickness at the center,
b-3) The position where the thickness of the elastic piece is minimum exists between the center and the end, and
c) The hinge mechanism is made of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond,
The hinge cap provided with an elastic piece characterized in that the snapping, durability, and operability are good, and in the process of attaching the cap to the container, the transferability in the cap supply is good. There is an effect that it is possible to provide a hinge cap including a three-point hinge mechanism formed integrally from resin.

It is a partial cross section side view which shows a hinge cap provided with the elastic piece of this invention in a closed state. It is a partial cross section side view which shows a hinge cap provided with the elastic piece of this invention in an open state. It is a top view in the open state of a hinge cap provided with the elastic piece of this invention. It is an enlarged plan view which shows an example of the hinge mechanism of a hinge cap provided with the elastic piece of FIG. It is sectional drawing which follows an II line | wire of FIG. 4 which shows an example of the hinge main body in a hinge mechanism. It is sectional drawing which follows an II-II line | wire of FIG. 4 which shows an example of the elastic piece in a hinge mechanism. 1 is a schematic diagram of a specific example of a device for attaching a cap to a container.

I. Hinge Cap A hinge cap including the elastic piece of the present invention includes a cap body (1) attached to the mouth and neck of a container, an overcap (2) covering the top of the cap body (1), and the cap body (1 ) Including a hinge mechanism (3) for slidably connecting the overcap (2) between a closed state and an open state, and an elastic piece integrally formed from a synthetic resin It is a cap. In describing the present invention with reference to the drawings, the same numbers and symbols in the drawings as those used in the description of the prior art are used.

1. Cap body The cap body (1) attached to the mouth and neck of the container is a cup-like member that is directly attached to the mouth and neck of the container by fitting or screwing. As shown in FIGS. 1 and 2, the cap body (1) usually further includes a substantially cylindrical portion surrounding the mouth and neck portion, and a top plate portion that abuts on the tip surface (upper end) of the mouth and neck portion. Also good. An opening is formed at the center of the top plate portion, and this opening forms a spout (4) for pouring the contents of the container. A substantially cylindrical member may protrude from the top plate portion of the cap body (1) so as to surround the spout (4), thereby facilitating pouring the contents of the container. In addition, from the viewpoint of preventing the contents of the container from being spoiled, an oxygen gas barrier single layer or multilayer sheet or film (not shown) is provided on the inner surface of the top plate portion that is in contact with the contents of the container as necessary. May be provided. A screw part (1a) is provided on the inner peripheral surface of the cap body (1) to be screwed with the outer peripheral surface of the mouth neck of the container, and the outer peripheral surface is subjected to knurling (notching) to prevent slipping. Also good.

  The size of the cap body (1) in the hinge cap provided with the elastic piece of the present invention is not particularly limited. Usually, the substantially cylindrical portion surrounding the mouth-and-neck portion has a diameter (outer diameter and inner diameter) of 10 to 80 mm and a height. The size of the overcap (2) and the hinge mechanism (3) can be determined according to the size of the cap body (1).

2. Overcap The overcap (2) that covers the top of the cap body (1) covers the top plate of the cap body (1) and closes the spout (4). And is swingably attached to the cap body (1). As shown in FIGS. 1 and 2, the inner surface of the overcap (2) (the surface on the cap body (1) side in the closed state in FIG. 1) is formed on the top plate portion of the cap body (1) when the lid is closed. A cylindrical member that is fitted in the opened opening and prevents the contents of the container from leaking from the spout (4) may be provided. Further, in order to maintain the overcap (2) in the closed state, a locking means (not shown) may be provided. Although the locking means is not limited, for example, a locking ring is provided on the outer peripheral portion of the top plate portion of the cap body (1), and the inner peripheral surface of the overcap (2) is locked using elastic deformation. You may make it become.

3. Hinge mechanism In a hinge cap comprising the elastic piece of the present invention, a hinge mechanism (3) for connecting the overcap (2) to the cap body (1) so as to be swingable between a closed state and an open state. ) Is a so-called three-point hinge mechanism, which is arranged on the hinge body (3a) for rotatably supporting the overcap (2) with respect to the cap body (1) and on both sides of the hinge body (3a). And a pair of elastic pieces (3b).

4). As shown schematically in FIGS. 4 and 5, the hinge body (3a) includes a portion (3a ₁ ) projecting outward along the upper edge of the substantially cylindrical portion of the cap body (1). A portion (3a ₂ ) projecting outward along the upper edge of the overcap (2) (the edge on the side in contact with the cap body (1) when the lid is closed), and these portions (3a ₁ ) And (3a ₂ ) are integrally coupled at a substantially central position. The overcap (2) is rocked about the horizontal axis on the coupling surface as a rocking shaft. In this embodiment, as shown in FIG. 5, each part (3a ₁ ) and (3a ₂ ) of the hinge body (3a) has a substantially triangular prism shape so that the coupling part is the thinnest. In the example of FIG. 5, a recess (3a ₃ ) is formed in the vicinity of the upper surface of the coupling portion along the direction of the swing axis. The recess (3a ₃ ) allows the hinge body ( The resistance to the folding of 3a) and the locking of the overcap (2) is reduced. The size, thickness, recess (3a ₃ ), etc. of the hinge body (3a) correspond to the sizes of the cap body (1) and the overcap (2), and the cap body (1) and the overcap (2). As long as the rotation is not hindered, it can be determined as appropriate.

5. Elastic piece The pair of elastic pieces (3b) disposed on both sides of the hinge body (3a) has both ends corresponding to the outer peripheral surface of the cap main body (1) and the outer peripheral surface of the overcap (2), respectively. It is connected along. In the opened state, it extends in a substantially arc shape between the cap body (1) and the overcap (2), for example, as schematically shown in FIGS. Moreover, the both ends of each elastic piece (3b) are joined to the step part currently formed in the outer peripheral surface of a cap main body (1) and an overcap (2), respectively, and a joining edge part is formed. As shown in FIG. 4, the joining end of each elastic piece (3b) and the cap body (1) and the overcap (2) is the outer peripheral surface of the cap body (1) and the overcap (2). An arc is formed along. However, the joining end portion does not need to form an arc, and may be linear along the outer peripheral surface of the cap body (1) or the overcap (2). The size of the elastic piece (3b) and the size and shape of the step portions formed on the outer peripheral surfaces of the cap body (1) and the overcap (2) are as follows. ) And can be appropriately determined within a range that does not hinder the rotation of the cap body (1) and the overcap (2).

  In the hinge mechanism (3) in the hinge cap including the elastic piece of the present invention, each elastic piece (3b) has a thickness at the end portion larger than a thickness at the center portion, and the thickness of the elastic piece (3b) is the smallest. Is located between the center and end of the elastic piece. In addition, the cross-sectional shape of an elastic piece (3b) is not specifically limited, For example, a center part can be made into a rectangular shape.

  In the elastic piece (3b), when the overcap (2) is swung from the open state to the closed state, the linear distance between the joint ends of the cap body (1) and the overcap (2) is considered. It gradually gets longer until the point. Since the synthetic resin forming the elastic piece (3b) is a material having elasticity, the elastic restoring force increases as the distance between the joint ends increases. Therefore, from the open state to the thought point, the overcap (2) is subjected to a tensile force for returning to the open state.

  Next, when the overcap (2) reaches the thought point, the distance between the joining ends of the elastic piece (3b) is maximized. At this time, the elastic piece (3b) is substantially linear. When the overcap (2) is further swung, a tensile force is applied to the overcap (2) in the direction of closing the cover. Thereby, even if the hand is released from the overcap (2), the overcap (2) automatically swings in the closed state. Finally, the overcap (2) is manually fitted to the cap body (1), so that the hinge cap is in the closed state shown in FIG. At this time, the elastic piece (3b) protrudes outward.

  Even when the overcap (2) is swung from the closed state to the open state, resistance is added to the swing of the overcap (2) up to the thought point. In 2), it swings in the direction of the open lid state and stabilizes in that state.

  In the hinge mechanism (3) in the hinge cap including the elastic piece of the present invention, each elastic piece (3b) has a thickness at the end portion larger than a thickness at the center portion, and the thickness of the elastic piece (3b) is the smallest. Is located between the center and end of the elastic piece.

  When the overcap (2) is swung, a larger stress is generated at the joint end of the elastic piece (3b) of the hinge mechanism (3). By making the thickness at the end of the elastic piece (3b) larger than the thickness at the center, the stress distribution of the elastic piece (3b) is made uniform, and the durability of the elastic piece (3b) and the hinge mechanism (3) is improved. improves. Needless to say, the ratio of the thickness at the end of the elastic piece (3b) to the thickness at the center (hereinafter sometimes referred to as “end / center thickness ratio”) is greater than 1, but usually 1. It is appropriate to define the shape of the hinge body (3a) to be in the range of 05 to 5, and the ratio is preferably 1.07 to 4, more preferably 1.1 to 3.5, and still more preferably. It is the range of 1.12-3. If the ratio is too small, the stress applied to the end of the elastic piece (3b) increases, and the durability of the elastic piece (3b) and the hinge mechanism (3) may be reduced. If the ratio is too large, the central portion of the elastic piece (3b) cannot withstand stress, and the durability of the elastic piece (3b) and the hinge mechanism (3) may be reduced.

  Further, since the position where the thickness of the elastic piece (3b) is the minimum exists between the central portion and the end portion of the elastic piece (3b), the snapping property when the overcap (2) is swung or The click feeling is good. That is, by adjusting the position where the thickness of the elastic piece (3b) is minimum and / or the ratio of the minimum thickness of the elastic piece (3b) to the thickness of the central portion of the elastic piece (3b), The tensile force can be adjusted, and the snapping property or click feeling when the overcap (2) is swung can be optimized. Needless to say, the ratio of the minimum thickness of the elastic piece (3b) to the thickness of the central portion of the elastic piece (3b) (hereinafter sometimes referred to as “minimum portion / central thickness ratio”) is less than 1. In general, it is appropriate to determine the shape of the elastic piece so as to be in the range of 0.7 to 0.99, and the ratio is preferably 0.75 to 0.97, more preferably 0.77 to 0. .96, more preferably in the range of 0.8 to 0.95. If the ratio is too small, the change in tensile force when the overcap (2) is swung may not be gentle, and an uncomfortable feeling may be felt. If the ratio is too large, the change in tensile force when the overcap (2) is swung may be monotonous and the snapping property or click feeling may not be good. The ratio of the distance from the central portion of the elastic piece (3b) to the distance between the central portion and the end of the elastic piece (3b) at the position where the thickness of the elastic piece (3b) is minimum (hereinafter referred to as “thickness”). It is appropriate to determine the shape of the elastic piece so that it is 0.001 or more and less than 1 and is usually in the range of 0.05 to 0.95. Is preferably in the range of 0.1 to 0.9, more preferably 0.2 to 0.8, and still more preferably 0.3 to 0.7. If the ratio is too small, the position where the thickness of the elastic piece (3b) is minimum is too close to the central portion of the elastic piece (3b), so the change in tensile force when the overcap (2) is swung. May be monotonous and have poor snapping or clicking feeling. If the ratio is too large, the position where the thickness of the elastic piece (3b) is minimum is too close to the end of the elastic piece (3b) where a large stress is generated when the overcap (2) is swung. There exists a possibility that durability of an elastic piece (3b) and a hinge mechanism (3) may fall.

II. Hinge cap integrally molded from a synthetic resin A hinge cap including an elastic piece of the present invention is integrally molded from a synthetic resin including a cap body (1), an overcap (2), and a hinge mechanism (3). Hinge cap. As described above, “synthetic resin” means a resin material containing an additive, a compounding agent and the like in addition to the synthetic resin.

  The composition of the resin material forming the cap body (1), the overcap (2), and the hinge mechanism (3) may be the same or different, but is the same from the viewpoints of moldability and handleability. Preferably, the composition is In addition, the composition of the resin material may be the same or uniform for each of the cap body (1), the overcap (2), and / or the hinge mechanism (3), and each of them may be non-uniform. It may be of a simple composition. A so-called gradient material in which the composition of the resin continuously changes may be used. For example, the composition of the hinge body (3a) and the elastic piece (3b) of the hinge mechanism (3) may be the same or different. The cap body (1), the overcap (2), or the hinge mechanism (3) may be a single layer or a laminated layer. For example, an oxygen gas barrier sheet or film, a reinforcing sheet, a film, or the like is laminated. It may be a thing.

1. Synthetic Resin A hinge cap including the elastic piece of the present invention is a hinge cap integrally formed from a synthetic resin, including a cap body (1), an overcap (2), and a hinge mechanism (3). As the synthetic resin, a synthetic resin conventionally used in a synthetic resin cap, particularly a hinge cap or a synthetic resin molded container, can be employed. Specifically, synthetic resins containing, as main resin components, polyolefins such as ethylene resins and propylene resins; polyesters such as polyethylene terephthalate, polyglycolic acid and polylactic acid; polyamides such as nylon 66 and nylon 612; Can be adopted. Preferably, the synthetic resin contains polyolefin as a main resin component.

  In addition to the main resin component described above, the hinge cap provided with the elastic piece of the present invention is within the range not impairing the object of the present invention, as desired, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene Other resin components such as methyl acrylate copolymer and maleic anhydride-modified polyolefin can be contained as a modifier or moldability improver. The content of these other resin components is usually 20% by mass or less, preferably 10% by mass or less, more preferably 5% by mass or less in the resin component in the resin material.

[Polyolefin]
Polyolefin preferably used as a synthetic resin for forming a hinge cap including the elastic piece of the present invention is an olefin monomer such as ethylene, propylene, butene, or pentene (hereinafter sometimes simply referred to as “olefin”). These are homopolymers or copolymers. Preferably, it is an ethylene-based resin or a propylene-based resin, and when importance is attached to repeated fatigue resistance, a propylene-based resin can be used.

[Ethylene resin]
The ethylene-based resin is an ethylene homopolymer or an ethylene copolymer containing ethylene as a main component, and the copolymer is a copolymer of ethylene with another olefin and / or another unsaturated monomer. It is a polymer. Preferred ethylene resins include low density polyethylene, high density polyethylene, metallocene catalyzed ethylene polyolefin, and the like.

The low density polyethylene is generally a polyethylene having a density of 0.910 to 0.930 g / cm ³ , preferably 0.912 to 0.928 g / cm ³ . In addition, the density of polyethylene is measured based on JIS K6922-2. As the low density polyethylene, one having an MFR (measured at a temperature of 190 ° C. and a load of 21.18 N) is usually 1 to 100 g / 10 minutes, preferably about 10 to 50 g / 10 minutes. In addition, those having a polydispersity (Mw / Mn), which is an index of molecular weight distribution, in the range of usually from 1.2 to 6, preferably from 1.5 to 4 are effective in improving moldability. In addition, MFR of polyethylene is measured based on JIS K6922-2, and polydispersity (Mw / Mn) which is an index of molecular weight distribution is measured based on JIS K7252.

  As low-density polyethylene, in addition to so-called Ziegler-Natta catalyst, high-pressure polyethylene (soft polyethylene), copolymers of ethylene and other olefins such as linear low-density polyethylene (LLDPE) are also used. can do. A synthetic product can be used as the low density polyethylene, but a commercially available product may be used. Commercially available products include Novatec LD (registered trademark) manufactured by Nippon Polyethylene Co., Ltd., and low density polyethylene manufactured by Mitsui DuPont Polychemical Co., Ltd.

High density polyethylene is generally polyethylene having a density of 0.942 g / cm ³ or more. Usually, it is polyethylene with a density of 0.980 g / cm ³ or less, preferably 0.945 to 0.970 g / cm ³ , more preferably 0.948 to 0.965 g / cm ³ . As the high density polyethylene, one having an MFR (measured at a temperature of 190 ° C. and a load of 21.18 N) is usually 1 to 100 g / 10 minutes, preferably about 10 to 50 g / 10 minutes. Moreover, what has polydispersity (Mw / Mn) in the range of 1.2-6 normally, preferably 1.5-4 is effective at the point of a moldability improvement. The high-density polyethylene can be a synthetic product, but can also be selected from commercially available products. A commercially available product is a low-pressure high-density polyethylene obtained using a so-called Ziegler-Natta catalyst (hereinafter sometimes referred to as “Ziegler catalyst”), which is well known as a catalyst for stereoregular polymerization of α-olefins. There are Novatec HD (registered trademark) manufactured by Nippon Polyethylene Co., Ltd. and Hi-Zex (registered trademark) manufactured by Prime Polymer Co., Ltd.

  Metallocene-catalyzed ethylene-based polyolefin means an ethylene-based resin obtained by using a metallocene catalyst. Ethylene or a mixed monomer containing ethylene as a main component and α-olefin as a subcomponent is present in the presence of a metallocene catalyst. It is an ethylene-based resin obtained by polymerizing below. Therefore, the metallocene-catalyzed ethylene-based polyolefin contains polyethylene or an ethylene / α-olefin copolymer obtained by performing a polymerization reaction in the presence of a metallocene catalyst. As the α-olefin, those having 3 to 10 carbon atoms are preferable, and propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, heptene-1, octene-1, and the like are preferable. Can be mentioned. These α-olefins are preferably present in the copolymer in an amount of 3 to 15 mol%.

Metallocene-catalyzed ethylene-based polyolefins are characterized by a narrow molecular weight distribution, and in the present invention, those having a polydispersity (Mw / Mn) of usually 1.2 to 6, preferably 1.5 to 4 are used. Is done. For the purpose of improving moldability, those having relatively long chain branches introduced during polymerization or in subsequent steps are also preferably used. The metallocene-catalyzed ethylene-based polyolefin usually has a density of about 0.890 to 0.920 g / cm ³ , preferably about 0.892 to 0.918 g / cm ³ , and MFR (temperature 190 ° C., load 21.18 N). ) Is usually 1 to 100 g / 10 min, preferably about 10 to 50 g / 10 min. As the metallocene-catalyzed ethylene-based polyolefin, a synthetic product can be used, but it can also be selected from commercially available products. Examples of commercially available products include Exelen (registered trademark) manufactured by Sumitomo Chemical Co., Ltd. and Harmolex (registered trademark) manufactured by Nippon Polyethylene Co., Ltd.

[Propylene resin]
In the present invention, the propylene-based resin particularly preferably used is a propylene homopolymer or a propylene copolymer containing propylene as a main component, and the copolymer includes propylene and other olefins such as ethylene. (Α-olefin) and / or copolymers with other unsaturated monomers. Preferred propylene-based resins include Ziegler-catalyzed propylene homopolymers or Ziegler-catalyzed propylene random copolymers, metallocene-catalyzed propylene homopolymers or metallocene-catalyzed propylene random copolymers, metallocene-catalyzed propylene-based block copolymers, and the like.

  The Ziegler-catalyzed propylene homopolymer or Ziegler-catalyzed propylene random copolymer is a propylene homopolymer or propylene random copolymer obtained using a Ziegler-Natta catalyst. The Ziegler-catalyzed propylene random copolymer has a propylene monomer unit content in the copolymer of 100 to 94% by mass (excluding 100% by mass), preferably 99.7 to 95% by mass, more preferably 99.5 to 95.5% by mass, and the content of α-olefin monomer units is 0 to 6% by mass (excluding 0% by mass), preferably 0.3 to 5% by mass, more preferably 0. A random copolymer having a ratio of 0.5 to 4.5% by mass. Examples of the α-olefin copolymerized with propylene include ethylene and / or an α-olefin having 4 to 20 carbon atoms, specifically, ethylene, butene-1, pentene-1, hexene-1, octene. -1,4-methylpentene-1 and the like. Two or more of the α-olefins can be used in combination.

The Ziegler-catalyzed propylene homopolymer or Ziegler-catalyzed propylene random copolymer has a density in the range of usually 0.880 to 0.930 g / cm ³ , preferably 0.885 to 0.925 g / cm ³ , An MFR (measured at a temperature of 190 ° C. and a load of 21.18 N) is usually 1 to 100 g / 10 minutes, preferably about 10 to 50 g / 10 minutes. The polydispersity (Mw / Mn) is usually in the range of 1.2 to 6, preferably 1.5 to 4, and is effective in terms of improving moldability. As the Ziegler-catalyzed propylene homopolymer or Ziegler-catalyzed propylene random copolymer, a synthetic product can be used, but a commercially available product may be used. Examples of commercially available products include Novatec PP (registered trademark) manufactured by Nippon Polypro Co., Ltd., Sumitomo Nobren (registered trademark) manufactured by Sumitomo Chemical Co., Ltd., Sun Allomer (registered trademark) manufactured by Sun Allomer Co., Ltd., and Prime Polymer Co., Ltd. Prime Polypro (registered trademark).

  The metallocene-catalyzed propylene homopolymer or metallocene-catalyzed propylene random copolymer is a propylene homopolymer or propylene random copolymer obtained using a metallocene catalyst. In the metallocene-catalyzed propylene random copolymer, the content of propylene monomer units in the copolymer is 100 to 94% by mass (excluding 100% by mass), preferably 99.7 to 95% by mass, more preferably. 99.5 to 95.5% by mass, and the content of α-olefin monomer units is 0 to 6% by mass (excluding 0% by mass), preferably 0.3 to 5% by mass, more preferably 0. A random copolymer having a ratio of 0.5 to 4.5% by mass. Examples of the α-olefin copolymerized with propylene include ethylene and / or an α-olefin having 4 to 20 carbon atoms, specifically, ethylene, butene-1, pentene-1, hexene-1, octene. -1,4-methylpentene-1 and the like. Two or more of the α-olefins can be used in combination.

The metallocene-catalyzed propylene homopolymer or metallocene-catalyzed propylene random copolymer usually has a density of about 0.880 to 0.930 g / cm ³ , preferably about 0.885 to 0.925 g / cm ³ , and MFR (Measured at a temperature of 190 ° C. and a load of 21.18 N) is usually 1 to 100 g / 10 minutes, preferably about 10 to 50 g / 10 minutes. Moreover, what has polydispersity (Mw / Mn) in the range of 1.2-6 normally, preferably 1.5-4 is effective at the point of a moldability improvement. As the metallocene-catalyzed propylene homopolymer or the metallocene-catalyzed propylene random copolymer, a synthetic product can be used, but it can also be selected from commercially available products. Examples of commercially available products include Wintec (registered trademark) manufactured by Nippon Polypro Co., Ltd.

  The metallocene-catalyzed propylene-based block copolymer is a block copolymer obtained by using a metallocene catalyst and comprising a polymer block made of polypropylene and a polymer block made of ethylene / propylene copolymer. . Specifically, a polymer block made of polypropylene (hereinafter sometimes referred to as “PP block”) and a polymer block made of propylene / ethylene copolymer (hereinafter sometimes referred to as “EP block”). Are block copolymers obtained by using a metallocene catalyst, each of which is bonded to one or more blocks, and the cyclic fatigue resistance is improved by propylene / ethylene copolymer while maintaining the rigidity of polypropylene. It is a block copolymer known per se that exhibits a high balance of rigidity and impact resistance.

The metallocene-catalyzed propylene-based block copolymer usually has a density of about 0.880 to 0.930 g / cm ³ , preferably about 0.885 to 0.925 g / cm ³ , and MFR (temperature 190 ° C., load 21. 18N) is usually 1 to 100 g / 10 min, preferably about 10 to 50 g / 10 min. Moreover, what has polydispersity (Mw / Mn) in the range of 1.2-6 normally, preferably 1.5-4 is effective at the point of a moldability improvement. A synthetic product can be used as the metallocene-catalyzed propylene-based block copolymer, but it can also be selected from commercially available products. Examples of commercially available products include Novatec PP (registered trademark) manufactured by Nippon Polypro Co., Ltd., Sumitomo Nobren (registered trademark) manufactured by Sumitomo Chemical Co., Ltd., Sun Allomer (registered trademark) manufactured by Sun Allomer Co., Ltd., and Prime Polymer Co., Ltd. Examples include Prime Polypro (registered trademark) and Kernel (registered trademark) manufactured by Nippon Polyethylene Corporation.

  The hinge cap integrally molded from synthetic resin is a synthetic resin obtained by using a Ziegler catalyst or a metallocene catalyst. The energy dispersive X-ray detection is performed on the resin pellet specimen scraped from the hinge cap. Qualitative analysis is performed using a scanning electron microscope equipped with a detector to detect a trace amount of elemental species of the catalyst remaining in the specimen, and the group IVa Ti, which is a transition metal in the fourth period of the periodic table, Appearance peak corresponding to the energy of the group Va which is the transition metal of the periodicity or the energy of the Cr of the group VIa which is the transition metal of the fourth period is confirmed (Ziegler catalyst), or the transition metal of the fifth period of the periodic table This is confirmed by confirming the presence of a peak corresponding to the energy of Zr of Group IVa or Hf of Group IVa which is a transition metal of the sixth period (metallocene catalyst). It is possible.

2. Fatty acid amide having an unsaturated cis structure carbon double bond In the hinge cap provided with the elastic piece of the present invention, the hinge mechanism (3) contains 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond. Made of synthetic resin. That is, in the hinge cap provided with the elastic piece of the present invention, at least the hinge mechanism (3) includes, in addition to the synthetic resin, the fatty acid amide (A) having an unsaturated cis structure carbon double bond, the hinge mechanism (3 ) To 100-4500 ppm with respect to the total mass of the synthetic resin. It is preferable that the cap body (1), the overcap (2) and the hinge mechanism (3) are made of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond. . The fatty acid amide (A) having an unsaturated cis-structured carbon double bond (hereinafter sometimes referred to as “unsaturated fatty acid amide of (A)”) means at least one bond of carbon diamide in the molecular structure of the fatty acid amide. An unsaturated fatty amide having a heavy bond, wherein all of the carbon double bonds are unsaturated cis-structured carbon double bonds.

  The hinge cap provided with the elastic piece of the present invention has at least a hinge mechanism (3) made of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond, thereby providing a snap property, It is possible to provide a hinge cap integrally formed from a synthetic resin, which has good durability and operability and has good transportability in cap supply in the step of attaching the cap to the container. The content of the unsaturated fatty acid amide (A) is preferably 110 to 4400 ppm, more preferably 115 to 4300 ppm, still more preferably 120 to 4200 ppm, and particularly preferably 125 to 4100 ppm. In addition, when the unsaturated fatty acid amide (A) is a mixture of fatty acid amides having two or more types of unsaturated cis structure carbon double bonds as described later, the total content of fatty acid amides is within the above range. Need to be included.

  When the content of the unsaturated fatty acid amide in (A) is in the above range, in the step of attaching the cap to the container, the transportability in supplying the cap can be improved. When the content of the unsaturated fatty acid amide of (A) is out of the above range, the hinge cap provided with the elastic piece is clogged in the cap supply means in the step of attaching the cap to the container, or the elastic piece to the capper is removed. There is a possibility that troubles such as stopping of the filling container manufacturing apparatus may occur due to the supply of the hinge cap provided.

  Fatty acid amides, particularly fatty acid amides having unsaturated bonds are known to function as lubricants for synthetic resins, but if unsaturated fatty acid amides have carbon double bonds with a trans structure, resin materials The unsaturated fatty acid amide having the trans structure is insufficient in the uniform blending of the hinge structure (3) and, in some cases, the outer surface of the hinge cap including the cap body (1) and the overcap (2) In some cases, the resin may come off or precipitate due to local foaming. As a result, the surface gloss and touch of the outer surface of the hinge cap such as the hinge mechanism (3) deteriorate, the hinge mechanism (3), etc. The slipperiness of the hinge cap may deteriorate, and in the process of attaching the cap to the container, the transportability in supplying the cap may not be good.

  The unsaturated fatty acid amide of (A) is preferably an unsaturated fatty acid amide having one bond of a carbon double bond having an unsaturated cis structure in the molecular structure. In addition, the unsaturated fatty acid amide of (A) may be an unsaturated fatty acid amide having a plurality of unsaturated cis-structured carbon double bonds in the molecular structure, and an unsaturated cis-structured carbon double bond in the molecular structure. , Preferably 6 bonds or less, more preferably 5 bonds or less, and still more preferably 4 bonds or less. Therefore, the unsaturated fatty acid amide (A) may contain a compound having an unsaturated cis structure carbon double bond having 2 to 4 bonds of unsaturated cis structure carbon double bonds in the molecular structure. .

[Unsaturated fatty acid amide having one carbon double bond of unsaturated cis structure in the molecular structure]
Examples of the unsaturated fatty acid amide (A) having one bond of a carbon double bond having an unsaturated cis structure include the following formulas (A ₁ ) to (A ₃ ):
(A ₁ ) H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10);
(A ₂ ) H ₂ N—CO — (— CH ₂ —) _m−2 —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10) And (A ₃ ) H ₂ N—CO — (— CH ₂ —) _{k + 4} —CH═CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10); ;
And at least one fatty acid amide compound represented by one formula selected from the group consisting of: (Hereinafter, (the fatty acid amide of the formula of _{A 1),} there may be referred to as "Formula _{(A 1} fatty acid amides)", further may be simply referred to as "Formula _{(A 1)". (A} 2) The same applies to the fatty acid amide represented by the formula (A ₃ ).)

Examples of the unsaturated fatty acid amide (A) having a preferred unsaturated cis-structured carbon double bond include compounds represented by the following formulas (A ₁ ) to (A ₃ ).

Formula (A ₁ ): H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10)
cis-8,9-hexadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₆ —CH ₃ ] (corresponding to n = 6)
cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] (corresponding to n = 7)
cis-10, 11-eicosenoamide [H ₂ N—CO — (— CH ₂ —) ₈ —CH═CH — (— CH ₂ —) ₈ —CH ₃ ] (corresponding to n = 8)
cis-11,12-ethaeicosenoamide [H ₂ N—CO — (— CH ₂ —) ₉ —CH═CH — (— CH ₂ —) ₉ —CH ₃ ] (corresponding to n = 9)
cis-12, 13- tetraeicosenoamide (corresponding to n = 10) _{[H 2 N-CO - (-} CH 2 -) 10 -CH = CH - (- - CH 2) 10 -CH 3 ]

Formula (A ₂ ): H ₂ N—CO — (— CH ₂ —) _{m− 2} —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is in the range of 6 ≦ m ≦ 10) integer)
cis-6,7-tetradecenoamide _{[H 2 N-CO - (-} CH 2 -) 4 -CH = CH - (- CH 2 -) 6 -CH 3 ] (corresponding to m = 6)
cis-7,8-hexadecenoamide [H ₂ N—CO — (— CH ₂ —) ₅ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] (corresponding to m = 7)
cis-8,9-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₈ —CH ₃ ] (corresponding to m = 8)
cis-9,10-eicosenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₉ —CH ₃ ] (corresponding to m = 9)
cis-10, 11- ethaeicosenoamide (corresponding to m = 10) _{[H 2 N-CO - (-} CH 2 -) 8 -CH = CH - (- - CH 2) 10 -CH 3 ]

Formula (A ₃ ): H ₂ N—CO — (— CH ₂ —) _{k + 4} —CH═CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10)
cis-12,13-eicosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₀ —CH═CH — (— CH ₂ —) ₆ —CH ₃ ] (corresponding to k = 6)
cis-13,14-docosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₁ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] (corresponding to k = 7)
cis-14,15- tetracosenoamide (corresponding to k = 8) _{[H 2 N-CO - (-} CH 2 -) 12 -CH = CH - 8 -CH 3 (- - CH 2) ]
cis-15,16-hexacosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₃ —CH═CH — (— CH ₂ —) ₉ —CH ₃ ] (corresponding to k = 9)
cis-16,17- octacosenoamide (corresponding to k = 10) _{[H 2 N-CO - (-} CH 2 -) 14 -CH = CH - (- - CH 2) 10 -CH 3 ]

[Unsaturated fatty acid amide having 2 to 4 carbon double bonds of unsaturated cis structure in the molecular structure]
The unsaturated fatty acid amide of (A), which is a compound having 2 to 4 bonds of unsaturated cis structure carbon double bonds in the molecular structure, includes, for example, an unsaturated cis structure carbon double bond in the molecular structure. The following compounds having 4 bonds are exemplified.

cis-5,6-8,9-11,12-14,15-arachidonic acid amide [H ₂ N—CO — (— CH ₂ —) ₃ —CH═CH—CH ₂ —CH═CH—CH ₂ — _{CH = CH-CH 2 -CH =} CH - (- CH 2 -) 4 -CH 3 ]

  The unsaturated fatty acid amide of (A), which is a compound having 2 to 4 carbon double bonds of unsaturated cis structure in the molecular structure, can be used alone or with other unsaturated fatty acid amides of (A) It can also be used as a mixture.

[Mixture of (A) unsaturated fatty acid amide]
As the unsaturated fatty acid amide of (A), a fatty acid amide of the above formulas (A ₁ ) to (A ₃ ), or a carbon double bond of an unsaturated cis structure of 2 to 4 bonds in the molecular structure. The use of one type of unsaturated fatty acid amide selected from fatty acid amides can provide the desired effect, but even if a mixture of two or more types of unsaturated fatty acid amides (A) is used. Good. The mixture of unsaturated fatty acid amides (A) preferably contains the fatty acid amide of the above formula (A ₁ ).

Accordingly, a preferred mixture of unsaturated fatty acid amides of (A) includes the fatty acid amide of the above formula (A ₁ ) and at least one fatty acid amide represented by the above formula of (A ₂ ) or (A ₃ ) And a mixture. The proportion of the fatty acid amide of the formula (A ₁ ) in the mixture is 0.05 to 99.95% by mass, preferably 0.1 to 99.9% by mass, more preferably 0.15 to 99.85% by mass. It is. Therefore, the ratio of the fatty acid amide of the formula (A ₂ ) or the fatty acid amide of the formula (A ₃ ) is 99.95 to 0.05% by mass, preferably 99.9 to 0.1% by mass, Preferably it is 99.85-0.15 mass%.

In particular, the mixture of unsaturated fatty acid amides of (A) is a fatty acid amide of formula (A ₁ ), ie H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ — ) _N —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10) and the fatty acid amide of the above formula (A ₂ ), that is, H ₂ N—CO — (— CH ₂ —) _{m— 2} -CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10), and m = n + 1 or m = n−1 And a mixture thereof.

Specifically, the formula (A ₁ ) is cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] ( n = 7), and
Formula _{(A 2)} is, cis-6,7-tetradecenoamide _{[H 2 N-CO - (-} CH 2 -) 4 -CH = CH - (- CH 2 -) 6 -CH 3 ] (m = 6 = n -1) or cis-8,9-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₈ —CH ₃ ] (m = 8 = (equivalent to n + 1) can be preferably used, and cis-10, 11-ethaeicosenoamide [H ₂ N—CO — (— CH ₂ —) ₈ —CH═CH — (— CH ₂ —) ₁₀ Mixtures of combinations with —CH ₃ ] (m = 10) can also be used.

In addition, the mixture of unsaturated fatty acid amides of (A) is a fatty acid amide of the above formula (A ₁ ), that is, H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ — ) _N- CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10) and the fatty acid amide of the above formula (A ₃ ), that is, H ₂ N—CO — (— CH ₂ —) _{k + 4} − CH = CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10), and is preferably a mixture with the fatty acid amide in which k = n. .

Specifically, the formula (A ₁ ) is cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] ( n = 7), and the formula (A ₃ ) is cis-13,14-docosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₁ —CH═CH — (— CH ₂ —) ₇ — CH ₃ ] (corresponding to k = 7 = n) is preferably used.

Furthermore, as the mixture of unsaturated fatty acid amides of (A), a mixture of two or more compounds belonging to the fatty acid amides of formula (A ₁ ) and having different values of n can be used. That is, (A ₁ ) H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10) And (A ₁₁ ) H ₂ N—CO — (— CH ₂ —) _j —CH═CH — (— CH ₂ —) _j —CH ₃ (where j is an integer in the range of 6 ≦ j ≦ 10) , J ≠ n)).

Specifically, for example, as formula (A ₁ ), cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ] (Corresponding to n = 7) and formula (A ₁₁ ), cis-8,9-hexadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₆ A mixture with —CH ₃ ] (corresponding to j = 6) can be preferably used.

Furthermore, the unsaturated fatty acid amide of (A) which is a compound having 2 to 4 carbon double bonds of unsaturated cis structure in the molecular structure is mixed with other unsaturated fatty acid amides of (A). It can also be used. As the other unsaturated fatty acid amides (A), the fatty acid amides of the above formulas (A ₁ ) to (A ₃ ) are preferably used, and the fatty acid amides of the formula (A ₁ ) are particularly preferable. Specifically, cis-5,6-8,9-11,12-14,15-arachidonic acid amide [H ₂ N—CO — (— CH ₂ —) ₃ —CH═CH—CH ₂ —CH═ _{CH-CH 2 -CH = CH-} CH 2 -CH = CH - (- CH 2 -) and 4 -CH _3], a mixture of cis-9,10-octadecenoamide represented by the formula _{(a 1)} and It can be preferably used.

[Method for producing unsaturated fatty acid amide (A)]
In the hinge cap provided with the elastic piece of the present invention, as the unsaturated fatty acid amide (A) contained in at least the hinge mechanism (3), a commercially available product may be used, or the commercially available product may be a mixture or an impurity. May be obtained by separating the desired unsaturated fatty acid amide by an operation such as extraction. Also, for example, the fatty acid amide of the above formula (A ₂ ), that is, (A ₂ ) H ₂ N—CO — (— CH ₂ —) _m−2 —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10) can be produced by the following method, and may be obtained as a synthetic product.

The following (formula a) having a CH ₃ O—CO— terminal group and a hydroxyl group terminal or a carboxylic acid terminal at the α, ω positions and a (m−1) -linked methylene group (—CH ₂ —) _m−1 ) As a starting material. ((Formula a) illustrates a compound having a hydroxyl terminal.)
(Formula _{a) CH 3 O-CO -} (- CH 2 -) m-1 -OH

The hydroxyl terminal of the compound represented by the formula (a) is bromine-substituted using carbon tetrabromide (CBr ₄ ), and then methyl cyanide (CH ₃ ) using triphenylphosphine (PPh ₃ , triphenylphosphine). CN) Bromine is reacted with PPh ₃ in a solvent to give an ionic intermediate of formula (b).
(Formula b) [CH ₃ O—CO — (— CH ₂ —) _m−1 -PPh ₃ ] ⁺ + Br ⁻

The ionic intermediate (formula b) is reacted with decyl aldehyde, and the PPh ₃ group is terminated with an alkyl group having an unsaturated cis-structured carbon double bond. , ω structure compound.
(Formula _{c) CH 3 O-CO -} (- CH 2 -) m-2 -CH = CH - (- CH 2 -) m -CH 3

Next, lithium hydroxide is reacted with the CH ₃ O—CO— terminal group of the α, ω structure compound of the formula (c) to form a hydroxyl terminal, which is saturated with ammonium in a solvent of oxalyl chrolide and methylene chloride. The fatty acid amide having an unsaturated cis structure carbon double bond represented by the following (formula d), that is, a fatty acid amide of (A ₂ ) is synthesized.
(Wherein _{d) H 2 N-CO -} (- CH 2 -) m-2 -CH = CH - (- CH 2 -) m -CH 3
By changing m (where m is an integer in the range of 6 ≦ m ≦ 10), a fatty acid amide having an unsaturated cis structure carbon double bond having a desired carbon number is obtained using this synthetic route. Can do.

In the synthesis of fatty acid amide having an unsaturated carbon double bond, as is well known, a compound having an unsaturated cis structure carbon double bond and a compound having an unsaturated trans structure carbon double bond are simultaneously prepared. As a result, chromatographic development is performed using a mixed solvent having a concentration gradient of 100% by mass (initial development) to 40% by mass of ethyl acetate and hexane, and isomerism of unsaturated cis structure and unsaturated trans structure is achieved. Separate the body. At that time, using a proton ¹ H-NMR nuclear magnetic resonance apparatus, identification according to the chemical shift value is performed based on a standard substance made by Aldorich for the fraction solution at each chromatography development time. Identify the fluid. The fraction solution is dried under reduced pressure to recover the desired fatty acid amide having an unsaturated cis structure carbon double bond.

3. Other compounding agents At least the hinge mechanism (3) in the cap body (1), the overcap (2), and the hinge mechanism (3) of the hinge cap provided with the elastic piece integrally molded from the synthetic resin of the present invention. However, it is essential that the unsaturated fatty acid amide of (A) is contained in an amount of 100 to 4500 ppm, and, if necessary, as other compounding agents, reinforcing materials, fillers, antioxidants, photodegradation inhibitors In addition, additives such as antistatic agents, ultraviolet absorbers, or nucleating agents can be blended. As the reinforcing material or filler, talc, calcium carbonate, titanium oxide, carbon black, mica and the like can be used. What is necessary is just to select the quantity of the optimal range according to the objective of an additive in the range of 0.01-100 mass parts normally with respect to 100 mass parts of synthetic resins. For example, the reinforcing material or filler can be blended in an amount of usually 10 to 100 parts by mass, preferably 15 to 80 parts by mass, and more preferably 20 to 60 parts by mass. Depending on the type of the additive, it may be usually 0.01 to 10 parts by mass, preferably 0.05 to 5 parts by mass, more preferably 0.1 to 2 parts by mass.

  In particular, as other compounding agents, other compounds known as lubricants can be used. The lubricant is preferably a saturated fatty acid amide. In the hinge cap provided with the elastic piece of the present invention, at least the hinge mechanism (3) contains a predetermined amount of the unsaturated fatty acid amide (A), and the saturated fatty acid amide. By containing, the effect that the transportability in cap supply can be further improved is exhibited. As the saturated fatty acid amide, a compound usually used as a lubricant can be used, for example, butyramide, valeric acid amide, caproic acid amide, caprylic acid amide, capric acid amide, lauric acid amide, myristic acid amide, Examples include palmitic acid amide, stearic acid amide, arachidic acid amide, and behenic acid amide, and stearic acid amide and behenic acid amide are preferable. The content in the case of containing a saturated fatty acid amide is preferably 10% by mass or less, more preferably 8% by mass or less, and still more preferably, with respect to the total amount of the unsaturated fatty acid amide (A) and the saturated fatty acid amide. The lower limit of the content is about 0.5% by mass, and if it is 1% by mass, a sufficient effect can be realized.

III. Evaluation of hinge cap provided with elastic piece The hinge cap provided with the elastic piece of the present invention has good snapping property, durability and operability, and good transferability in cap supply in the step of attaching the cap to the container. It is a hinge cap provided with an elastic piece of a three-point hinge mechanism integrally formed from a certain synthetic resin.

[Evaluation of transportability in cap supply (chute clogging evaluation)]
It can be evaluated by the following method that the hinge cap provided with the elastic piece has good transportability of cap supply in the step of attaching the cap to the container, for example, as schematically shown in FIG. That is, 10,000 hinge caps (c) that have been previously closed are put into a hopper (not shown), and the square shape of a square of 40 mm in length and 40 mm in width and 500 mm in length is formed from the hopper. The hinge cap (c) in the closed state is continuously put into the conduit (chute) at a supply rate of 2 pieces / second and transferred to the capper device using the delivery device (D). In this series of transfer steps, the number of times (out of 10,000) that the chute is clogged with the chute is counted. The measurement is performed three times, and the average value is used as the number of times of shoot clogging, and shoot clogging is evaluated according to the following criteria. If the chute clogging evaluation is “◯”, it can be said that the cap supply transportability is good in the process of attaching the cap to the container.
<Shoot clogging evaluation>
Choke clogging evaluation ○: Shoot clogging times 0-2 times Chute clogging evaluation ×: Shoot clogging times 3 times or more

[Evaluation of snap properties]
The snapping property of the hinge cap provided with the elastic piece can be determined by the following determination based on the click feeling evaluation. That is, a test in which the hinge mechanism (3) of the integrally formed hinge cap is swung from the closed state to the open state and then swung from the open state to the closed state is repeated 50 times. A test subject (age 18-60) performs a sensibility evaluation as to whether or not a pleasant click feeling is felt. A majority of the subjects determine that the click feeling is good for the hinge cap provided with the elastic piece evaluated that the pleasant click feeling persists.

IV. Manufacturing method of hinge cap integrally molded from synthetic resin The manufacturing method of the hinge cap provided with the elastic piece of the present invention is not particularly limited. For example, a synthetic resin and a fatty acid amide having an unsaturated cis structure carbon double bond ( A) If necessary, a resin material containing other materials is added to a cavity-shaped mold corresponding to the hinge cap including the cap body (1), the overcap (2), and the hinge mechanism (3). It can be manufactured by injection molding, compression molding, cast molding, vacuum molding, pressure molding, powder molding and other resin molding methods.

  The hinge cap provided with the elastic piece of the present invention includes a hinge mechanism (3) of a so-called three-point hinge mechanism, and each elastic piece (3b) of the hinge mechanism (3) has a thickness at the end portion at the center portion. The position at which the thickness of the elastic piece (3b) is minimum is present between the central portion and the end portion of the elastic piece (3b), and the hinge mechanism (3) is unsaturated. It is characterized by comprising a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having a cis structure carbon double bond. Therefore, in manufacturing a hinge cap including the elastic piece of the present invention, a cavity-shaped mold corresponding to the hinge mechanism (3) is used, and a fatty acid amide having an unsaturated cis structure carbon double bond ( It is required to reliably supply a synthetic resin containing 100 to 4500 ppm of A) to a cavity-shaped mold corresponding to the hinge mechanism (3).

  In order to manufacture the hinge cap provided with the elastic piece of the present invention from the viewpoints of shape accuracy, ease of molding, etc., the cap body (1) and the overcap (2) that have been opened at about 180 degrees. And forming the cap body (1), the overcap (2), and the hinge mechanism (3) integrally using a cavity-shaped mold corresponding to the hinge cap including the hinge mechanism (3). Is preferred. In particular, it is preferable to integrally mold a hinge cap including an elastic piece by injection molding.

  Further, after the hinge cap integrally molded from the synthetic resin is taken out from the mold by the above-described molding method, the hinge mechanism (3) is usually swung to close the hinge cap provided with the elastic piece. Then, by heat-fixing in the closed state, the shape and dimensions of the hinge cap provided with the elastic piece are adjusted and stable, and the transportability and snapability in cap supply are further improved. In the heat setting, heat treatment is performed at a temperature of 30 to 80 ° C., preferably 35 to 75 ° C., more preferably 40 to 70 ° C. by a method known per se such as storage in a constant temperature room or hot air blowing. The time for performing the heat setting can be appropriately selected according to the temperature of the heat treatment and other conditions, but is usually 0.5 hours to 3 months, preferably 5 hours to 1 month, more preferably 1 day to 2 weeks. do it.

  EXAMPLES The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited to the examples. The measuring method of the characteristic or physical property of a hinge cap provided with the resin raw material and an elastic piece in an Example and a comparative example is as follows.

[Density, MFR and polydispersity]
The density and MFR (temperature 190 ° C., load 21.18 N) of the synthetic resin were measured according to JIS K6922-2. The polydispersity (Mw / Mn) was measured according to JIS K7252.

[Shoot clogging evaluation]
It was evaluated by the following method that the hinge cap provided with the elastic piece had good cap supply transportability in the step of attaching the cap to the container. That is, a hinge cap having 10,000 pieces of elastic pieces previously closed is put into a hopper, and a rectangular column-shaped conduit (chute) having a square cross section of 40 mm in length and 40 mm in width and 500 mm in length from the hopper. ), The hinge cap (c) including the elastic piece in the closed state is continuously charged at a supply speed of 2 pieces / second and transferred to the capper device using the delivery device (D). In this series of transfer steps, the number of times of chute clogging in the chute (out of 10,000) was counted. Measurement was performed three times, and the average value was taken as the number of times of shoot clogging, and shoot clogging was evaluated according to the following criteria.
<Shoot clogging evaluation>
Choke clogging evaluation ○: Shoot clogging times 0-2 times Chute clogging evaluation ×: Shoot clogging times 3 times or more

[Click feeling evaluation]
The test of repeating the operation of swinging the hinge mechanism (3) of the integrally formed hinge cap from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. The subjects (aged 18 to 60) perform a sensibility evaluation as to whether or not a pleasant click feeling can be felt, and the majority of the subjects feel the click on the hinge cap provided with the elastic piece evaluated that the pleasant click feeling is sustained. It was determined to be good.

[Example 1]
Ziegler-catalyzed propylene homopolymer [Prime Polypro (registered trademark) manufactured by Prime Polymer Co., Ltd., density 0.90 g / cm ³ , MFR (measured at 190 ° C. temperature, load 21.18 N) 33 g / 10 min, polydispersity ( Mw / Mn) = 3], cis-13,14-docosenoamide [H ₂ N—CO — (— CH ₂ —) ₁₁ − as a fatty acid amide (A) having an unsaturated cis structure carbon double bond CH = CH — (— CH ₂ —) ₇ —CH ₃ ; unsaturated fatty acid amide of formula (A ₃ )] (98.0% by mass) and cis-9,10-octadecenoamide [H ₂ N—CO — (— CH ₂ —) ₇ —CH═CH — (— CH ₂ —) ₇ —CH ₃ ; a mixture of unsaturated fatty acid amides of formula (A ₁ )] (2.0% by mass) into a Ziegler-catalyzed propylene homopolymer. On the other hand, it is blended so that it becomes 4000 ppm. To give a resin composition containing an unsaturated fatty acid amide.

  The obtained resin composition containing the unsaturated fatty acid amide of (A) is supplied to an injection molding machine, and the cap body (1), the overcap (2), and the hinge that are in the open state of 180 degrees are provided. Using a cavity-shaped mold corresponding to the hinge cap provided with the mechanism (3), the hinge cap provided with the elastic piece was integrally formed by injection molding.

The shape and size of the cap body (1), the overcap (2), and the hinge mechanism (3) of the hinge cap provided with the elastic piece were as follows.
1) Cap body (1): A substantially cylindrical shape having an outer diameter of 37 mm, an inner diameter of 32 mm, and a height of 27 mm. Outlet diameter 10mm
2) Overcap (2): substantially cylindrical shape with an outer diameter of 37 mm, an inner diameter of 33 mm, and a height of 9 mm 3) Hinge mechanism (3)
Hinge body (3a): Width (oscillating axis direction) 10mm, length 4mm, center (minimum) thickness 0.1mm, end thickness 0.3mm
Elastic piece (3b): width 2.5 mm, length 6 mm
Edge / center thickness ratio: 1.50
Minimum part / central part thickness ratio: 0.900
Minimum thickness distance ratio: 0.45

  After the hinge cap provided with the elastic piece formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung to place the hinge cap provided with the elastic piece in a closed state at a temperature of 40 ° C. for one week. Heat-fixed by heat treatment.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the heat-fixed elastic piece, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. However, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of chute clogging evaluation performed on the hinge cap provided with this elastic piece.

[Example 2]
The fatty acid amide (A) having an unsaturated cis structure carbon double bond is converted into cis-9,10-octadecenoamide [unsaturated fatty acid amide of the formula (A ₁ )] (85.0% by mass) and cis-8,9- hexadecenoamide [H ₂ N—CO — (— CH ₂ —) ₆ —CH═CH — (— CH ₂ —) ₆ —CH ₃ ; unsaturated fatty acid amide of formula (A ₁₁ )] (15.0 mass%) Except for the change to the mixture and mix to 130 ppm, and the change of the hinge cap shape with 0.885 as the minimum / center thickness ratio in the elastic piece (3b) of the hinge mechanism (3) In the same manner as in Example 1, a hinge cap provided with an elastic piece was integrally formed by injection molding.

  After the hinge cap provided with the elastic piece formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung to place the hinge cap provided with the elastic piece in a closed state at a temperature of 40 ° C. for one week. Heat-fixed by heat treatment.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the heat-fixed elastic piece, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. However, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of chute clogging evaluation performed on the hinge cap provided with this elastic piece.

[Example 3]
The fatty acid amide (A) having an unsaturated cis-structured carbon double bond was changed to single use of cis-13,14-docosenoamide [unsaturated fatty acid amide of formula (A ₃ )] and blended so as to be 3500 ppm. Except for changes, a hinge cap including an elastic piece was integrally formed by injection molding in the same manner as in Example 2.

  After the hinge cap provided with the elastic piece formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung to place the hinge cap provided with the elastic piece in a closed state at a temperature of 40 ° C. for one week. Heat-fixed by heat treatment.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the heat-fixed elastic piece, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. However, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of chute clogging evaluation performed on the hinge cap provided with this elastic piece.

[Example 4]
Instead of the Ziegler-catalyzed propylene homopolymer of Example 1, a Ziegler-catalyzed propylene random copolymer (manufactured by Sun Allomer Co., Ltd., density 0.90 g / cm ³ , MFR (measured at a temperature of 190 ° C. and a load of 21.18 N)) 30 g / 10 min, change of synthetic resin using polydispersity (Mw / Mn) = 3], change of blending of fatty acid amide (A) having an unsaturated cis structure carbon double bond to 3500 ppm, and The elastic piece is obtained by injection molding in the same manner as in Example 1 except that the shape of the hinge cap is changed to 0.930 as the minimum portion / center thickness ratio in the elastic piece (3b) of the hinge mechanism (3). A hinge cap provided with was integrally molded.

  After the hinge cap provided with the elastic piece formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung to place the hinge cap provided with the elastic piece in a closed state at a temperature of 40 ° C. for one week. Heat-fixed by heat treatment.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the heat-fixed elastic piece, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. However, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of chute clogging evaluation performed on the hinge cap provided with this elastic piece.

[Example 5]
The fatty acid amide (A) having an unsaturated cis structure carbon double bond is converted into cis-9,10-octadecenoamide [formula (A ₁ )] (50.0 mass%) and cis-10,11-ethaeicosenoamide [H ₂ N _{-CO - (- CH 2 -)} 8 -CH = CH - (- CH 2 -) 10 -CH 3 ]; changed to a mixture of formula _{(a 2)} of the unsaturated fatty acid amide] (50.0 wt%) Except for changes in the composition so as to be 500 ppm, and changes in the shape of the hinge cap in which the thickness ratio of the minimum part / center part of the elastic piece (3b) of the hinge mechanism (3) is 0.900. In the same manner as in No. 4, a hinge cap provided with an elastic piece was integrally formed by injection molding.

  After the hinge cap provided with the elastic piece formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung to place the hinge cap provided with the elastic piece in a closed state at a temperature of 40 ° C. for one week. Heat-fixed by heat treatment.

For the hinge cap provided with the heat-fixed elastic piece, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. However, it was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of chute clogging evaluation performed on the hinge cap provided with this elastic piece.

[Example 6]
Unsaturated cis structure fatty acid amide having a carbon double bond (A), to change to a single use of cis-13,14-docosenoamide [unsaturated fatty acid amide of formula (A _3)], was set to be 2000ppm formulation And the hinge cap provided with the elastic piece formed by injection molding is taken out of the mold, and then the hinge mechanism (3) is swung so that the hinge cap provided with the elastic piece is in a closed state. A hinge cap provided with an elastic piece was integrally formed by injection molding in the same manner as in Example 5 except that the heat setting performed by heat treatment at 40 ° C. for 1 week was not performed.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the molded elastic piece, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. It was determined that a pleasant click feeling persisted and the click feeling was good. In addition, Table 1 shows the results of chute clogging evaluation performed on the hinge cap provided with this elastic piece.

[Comparative Example 1]
The fatty acid amide (A) having an unsaturated cis structure carbon double bond is converted into cis-9,10-octadecenoamide [unsaturated fatty acid amide of the formula (A ₁ )] (85.0% by mass) and cis-8,9- Change to a mixture of hexadecenoamide [unsaturated fatty acid amide of formula (A ₁₁ )] (15.0% by mass) to 5500 ppm, and the elastic piece (3b) of the hinge mechanism (3) The position where the thickness is minimum does not exist between the central portion and the end portion of the elastic piece (3b), that is, the position where the thickness of the elastic piece (3b) is minimum is at the central portion of the elastic piece (3b). Therefore, the hinge cap provided with the elastic piece is integrated by injection molding in the same manner as in Example 4 except that the shape of the hinge cap is changed to 1.000 as the minimum thickness / center thickness ratio of the elastic piece. Molded.

  After the hinge cap provided with the elastic piece formed by injection molding is taken out from the mold, the hinge mechanism (3) is swung to place the hinge cap provided with the elastic piece in a closed state at a temperature of 40 ° C. for one week. Heat-fixed by heat treatment.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the heat-fixed elastic piece, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. However, a slightly stronger click feeling was felt. In addition, Table 1 shows the results of chute clogging evaluation performed on the hinge cap provided with this elastic piece.

[Comparative Example 2]
The fatty acid amide (A) having an unsaturated cis structure carbon double bond corresponds to the trans-9,10-octadecenoamide [trans structure of the unsaturated fatty acid amide of the formula (A ₁ ). ] Change to (single use), change the composition to 2000ppm, and swing out the hinge mechanism (3) after removing the hinge cap with the elastic piece formed by injection molding from the mold The hinge cap provided with an elastic piece by injection molding in the same manner as in Comparative Example 1 except that the hinge cap was closed and the heat setting performed by heat treatment at 40 ° C. for 1 week was not performed. Was integrally molded.

[Click feeling evaluation and chute clogging evaluation]
For the hinge cap provided with the molded elastic piece, the operation of swinging the hinge mechanism (3) from the closed state to the open state and then swinging from the open state to the closed state was repeated 50 times. I felt a slightly stronger click feeling. In addition, Table 1 shows the results of chute clogging evaluation performed on the hinge cap provided with this elastic piece.

  From the results of Table 1, the cap body (1), the overcap (2), and the hinge integrally molded from a synthetic resin containing 130 to 4000 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond A hinge cap provided with an elastic piece integrally formed from a synthetic resin and provided with a mechanism (3), wherein each elastic piece (3b) has a thickness at an end larger than a thickness at a central portion, and an elastic piece The hinge cap provided with the elastic piece of Examples 1 to 6 in which the position where the thickness of (3b) is the minimum exists between the central portion and the end portion of the elastic piece (3b) has a pleasant click feeling. As a result, the snap property was excellent, and the chute clogging evaluation was “◯”, suggesting that the cap supply transportability was good in the step of attaching the cap to the container.

  On the other hand, in any case, the position where the thickness at the end of the elastic piece (3b) in the hinge mechanism (3) is larger than the thickness at the center and the thickness of the elastic piece (3b) is minimum, The hinge cap of Comparative Example 1 which does not exist between the central portion and the end portion of the elastic piece, and further contains a fatty acid amide (A) having an unsaturated cis structure carbon double bond in a large amount of 5500 ppm, and Furthermore, the hinge cap of Comparative Example 2 that does not contain the fatty acid amide (A) having an unsaturated cis-structured carbon double bond has a strong click feeling and a shoot clogging evaluation of “x”. It was suggested that the cap supply transferability is not good in the cap attachment process.

The present invention relates to a cap main body attached to the mouth and neck of a container, an overcap covering the top of the cap main body, and the overcap swinging between a closed state and an open state with respect to the cap main body A hinge cap integrally formed from a synthetic resin, having a hinge mechanism that can be connected, and includes the following a) to c):
a) The hinge mechanism has a hinge body that rotatably supports the overcap with respect to the cap body, and a pair of elastic pieces disposed on both sides of the hinge body,
b) The elastic piece is
b-1) Both ends are connected along the outer peripheral surface of the cap body and the outer peripheral surface of the overcap, respectively,
b-2) The thickness at the end is greater than the thickness at the center,
b-3) The position where the thickness of the elastic piece is minimum exists between the center and the end, and
c) The hinge mechanism is made of a synthetic resin containing 100 to 4500 ppm of fatty acid amide (A) having an unsaturated cis structure carbon double bond,
By being a hinge cap with an elastic piece characterized by
There can be provided a hinge cap provided with an elastic piece of a three-point hinge mechanism integrally molded from a synthetic resin, which has good snapping property, durability and operability, and good transferability in cap supply. So the industrial applicability is high.

1: Cap body 1a: Screw part 2: Overcap 3: Hinge mechanism 3a: Hinge body 3a ₁ : A part 3a projecting outward along the upper edge of the substantially cylindrical part of the cap body ₂ : Overcap Portion 3a ₃ projecting outward along the upper edge: Recess 3b: Elastic piece 4: Spout D: Cap support device (delivery device)
b: container c: cap d: cap supply means e: capper f: gripper

Claims (12)

A cap main body attached to the mouth and neck of the container, an overcap covering the top of the cap main body, and the overcap connected to the cap main body so as to be swingable between a closed state and an open state A hinge cap integrally formed from a synthetic resin and having a hinge mechanism, which includes the following a) to c):
a) The hinge mechanism is
a- 1) having a hinge body that rotatably supports the overcap with respect to the cap body, and a pair of elastic pieces disposed on both sides of the hinge body,
a-2) having a recess in the vicinity of the upper surface of the connecting portion between the protruding portion of the cap body and the protruding portion of the overcap along the direction of the swing axis;
b) The elastic piece is
b-1) Both ends are connected along the outer peripheral surface of the cap body and the outer peripheral surface of the overcap, respectively,
b-2) The thickness at the end is larger than the thickness at the center, and the ratio of the thickness at the end to the thickness at the center is in the range of 1.05 to 5,
b-3) The position where the thickness of the elastic piece is minimum exists between the central portion and the end portion, and the ratio of the minimum thickness of the elastic piece to the thickness of the central portion of the elastic piece is 0.7-0. .99, and
wherein c) said hinge mechanism, Ri Do fatty acid amide having a carbon Motoni double bonds (A) from 130-4000 ppm-containing synthesized resin, all of the carbon-carbon double bond is unsaturated cis structure, that A hinge cap provided with an elastic piece. Wherein the cap body, the overcap and the hinge mechanism, fatty acid amides having carbon Motoni double bonds (A) Ri Do from 130 to 4,000 ppm content to synthetic resin, all of the carbon-carbon double bonds in unsaturated cis structure is there,
A hinge cap comprising the elastic piece according to claim 1. The fatty acid amide (A) having an unsaturated cis structure carbon double bond is represented by the following (A ₁ ), (A ₂ ) and (A ₃ ):
(A ₁ ) H ₂ N—CO — (— CH ₂ —) _n —CH═CH — (— CH ₂ —) _n —CH ₃ (where n is an integer in the range of 6 ≦ n ≦ 10);
(A ₂ ) H ₂ N—CO — (— CH ₂ —) _m−2 —CH═CH — (— CH ₂ —) _m —CH ₃ (where m is an integer in the range of 6 ≦ m ≦ 10) And (A ₃ ) H ₂ N—CO — (— CH ₂ —) _{k + 4} —CH═CH — (— CH ₂ —) _k —CH ₃ (where k is an integer in the range of 6 ≦ k ≦ 10); ;
The hinge cap provided with the elastic piece of Claim 1 or 2 containing the at least 1 sort (s) of fatty acid amide represented by one formula chosen from the group which consists of these. The fatty acid amide (A) having an unsaturated cis structure carbon double bond is represented by the fatty acid amide represented by the formula (A ₁ ) and the formula (A ₂ ) or (A ₃ ). A hinge cap comprising an elastic piece according to claim 3, wherein the hinge cap is a mixture with at least one fatty acid amide. The hinge cap provided with the elastic piece according to claim 4, wherein m in the fatty acid amide represented by the formula (A ₂ ) is m = n + 1 or m = n−1. The hinge cap provided with the elastic piece according to claim 4, wherein k in the fatty acid amide represented by the formula (A ₃ ) is k = n. The fatty acid amide (A) having an unsaturated cis structure carbon double bond is a fatty acid amide represented by the above formula (A ₁ ), and the following (A ₁₁ ):
(A ₁₁ ) H ₂ N—CO — (— CH ₂ —) _j —CH═CH — (— CH ₂ —) _j —CH ₃ (where j is an integer in the range of 6 ≦ j ≦ 10, j ≠ n.);
A hinge cap comprising an elastic piece according to claim 4, which is a mixture with a fatty acid amide represented by the formula: The fatty acid amides with unsaturated cis structure carbon double bond (A) is any of claims 1 to 7 containing a compound having two bonds to 4 bonds carbon double bonds of the unsaturated cis structure in a molecular structure A hinge cap comprising the elastic piece according to claim 1. The hinge cap provided with the elastic piece according to any one of claims 1 to 8, wherein the synthetic resin containing the fatty acid amide (A) having an unsaturated cis structure carbon double bond further contains a saturated fatty acid amide. . The hinge cap provided with the elastic piece according to any one of claims 1 to 9, wherein the synthetic resin contains polyolefin. The hinge cap provided with the elastic piece according to claim 10, wherein the polyolefin is a propylene resin. A hinge cap comprising the elastic piece according to any one of claims 1 to 11, wherein the hinge cap is heat-set in a closed state.

Images