JP2022013277A - Non-adsorptive packaging material and packaging bag using the same - Google Patents

Abstract

To provide a non-adsorptive packaging material which does not adsorb a flavor component and a drug effect of contents and exhibits a strong heat seal strength, and a packaging bag using the same.SOLUTION: A non-adsorptive packaging material has at least a base material layer, a gas barrier layer, a thermoplastic resin layer and a non-adsorptive coat layer formed by coating a coating agent for non-adsorptive layer formation on the thermoplastic resin layer, in which the non-adsorptive coat layer is arranged so as to be brought into contact with a content storage space, and the peripheral edge part is linearly heat sealed to form a bag. In the packaging material, the peripheral edge part is linearly heat sealed, thereby the non-adsorptive coat layer is destroyed by the heat and the pressure, the thermoplastic resins sandwiching the non-adsorptive coat layer are melted and sealed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a non-adsorptive packaging material most suitable for packaging a substance for which an aroma component or a medicinal component is desired to be retained, and a packaging bag using the same.

In recent years, as a kind of packaging bag, one composed of a single body or a laminated body based on a plastic film has become widespread, and various forms are used for a wide range of purposes, which are indispensable for modern life. It has become something like that.

For example, it is also used as a liquid bag, and is widely used in the food field such as retort foods as well as beverages. Also in the fields of medicines, cosmetics, daily necessities and toiletries, various products are crowded with the shelves of supermarkets, drug stores and convenience stores. In addition to liquid containers, various applications have been developed.

As packaging materials used for packaging these foods, pharmaceuticals, etc., in general, water vapor, oxygen, and other contents are altered in order to suppress alteration and decay of the contents and maintain their functions and properties. A laminated film having a gas barrier property that blocks the ingress of gas to be caused is used.

In many cases, a packaging bag made of a single body or a laminated body using a plastic film as a base material has a sealant layer on the innermost layer side, and the sealant layers are opposed to each other and heat-sealed to form a packaging bag. The method of making a bag is taken.

As such a sealant film, polyolefin resins such as polyethylene and polypropylene showing high sealing strength and copolymer resins such as ionomer and EMMA are used.

However, since the sealant film made of these resins easily adsorbs the components made of organic compounds such as fats and oils and fragrances, the packaging material having the sealant film as the innermost layer in contact with the contents changes the taste and aroma of the contents. It has the drawback of being easy to make. In addition, the contents are reduced due to the adsorption of aroma components, medicinal components and the like.

As a countermeasure, there is a method of using a polyacrylonitrile resin on the inner surface of the packaging bag. The conventional polyacrylonitrile film is a film having a thickness of about 20 to 30 μm formed by extrusion molding. This polyacrylonitrile film is usually laminated with another plastic film and used as a packaging material (Patent Document 1).

However, since polyacrylonitrile is a resin that is hard and brittle and has a weaker heat seal strength than polyethylene resin, it is not suitable for packaging bags for thick and heavy articles and three-dimensional objects when made into films and sheets. was there.

Therefore, it has been proposed to apply a coating agent containing polyacrylonitrile particles and polyester particles to a base material to form a thin non-adsorbent layer to obtain a packaging material (Patent Document 2). However, in the method of forming a thin non-adsorption layer on the film substrate by applying a coating agent for forming a non-adsorption layer, the coating agent is inferior in heat-sealing property in the non-adsorption layer portion, so that heat-sealing cannot be performed and the packaging bag can be used. There was a problem that it could not be done.

We also considered coating the non-adsorbent layer except for the heat-sealed portion, but it is technically impossible to coat the pattern completely, and the base film is partially exposed on the inner surface, resulting in non-adsorption property. There was a problem that it was insufficient.

Japanese Unexamined Patent Publication No. 8-143452 Japanese Unexamined Patent Publication No. 2012-184357

The present invention has been made to solve the above-mentioned problems, and is a non-adsorptive packaging material that does not adsorb aroma components and medicinal components of the contents and exhibits strong heat-sealing strength, and packaging using the same. The challenge is to provide the bag.

The invention according to claim 1 is a non-adsorbent coating formed by coating at least a base material layer, a gas barrier layer, a thermoplastic resin layer and a coating agent for forming a non-adsorbent layer on the thermoplastic resin layer. In a packaging material having a layer, the non-adsorptive coat layer is arranged so as to be in contact with the content accommodating space, and the peripheral edge portion is linearly heat-sealed to make a bag.
The peripheral portion is linearly heat-sealed, so that the non-adsorptive coat layer is destroyed by the heat and pressure, and the thermoplastic resins sandwiching the non-adsorbent coat layer are melted and sealed. It is a non-adsorptive packaging material characterized by this.

Further, in the invention according to claim 2, the coating agent for forming a non-adsorption layer contains a main agent composed of a polymer, a curing agent having a reactive functional group, and a dispersion medium.
The polymer constituting the main agent contains a nitrile group-containing acrylic monomer unit and a reactive functional group-containing acrylic monomer unit having a reactive functional group capable of reacting with the reactive functional group of the curing agent.
The curing agent is a diisocyanate compound in which the reactive functional group is an isocyanate group.
The reactive functional group-containing acrylic monomer unit is a hydroxy group-containing acrylic monomer unit.
The content of the nitrile group-containing acrylic monomer unit in the main agent is 15 to 40% by mass.
Claim 1 is characterized in that the molar ratio of the hydroxy group (A) in the main agent to the isocyanate group (B) in the curing agent, (B) / (A) is 2.0 or more and 5.0 or less. The non-adsorbent packaging material according to.

Further, according to the third aspect of the present invention, the coating agent for forming a non-adsorption layer contains a main agent composed of a polymer, a curing agent having an isocyanate group, and a dispersion medium.
The polymer constituting the main agent contains an acrylic monomer unit having a hydroxy group, and has a hydroxyl value of 30 mgKOH / g or more and 150 mgKOH / g or less.
The claim is characterized in that the molar ratio (D) / (C) of the hydroxy group (C) in the main agent to the isocyanate group (D) in the curing agent is 0.5 or more and 5.0 or less. The non-adsorbent packaging material according to 1.

The invention according to claim 4 is a packaging bag in which the non-adsorbent packaging material according to claim 1 is arranged so that the non-adsorbent coat layer is in contact with a space for accommodating the contents.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a non-adsorptive packaging material that does not adsorb aroma components and medicinal properties of the contents and exhibits strong heat-sealing strength, and a packaging bag using the same.

It is the schematic sectional drawing which shows an example about the layer structure of the packaging material which concerns on this invention. It is a front view of the packaging bag using the packaging material which concerns on this invention. It is a schematic sectional drawing which enlarges and shows the state in which the packaging material which concerns on this invention is heat-sealed by a line seal.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an embodiment of the non-adsorbent packaging material (1) according to the present invention.

As shown in FIG. 1, the non-adsorbent packaging material (1) according to the present invention includes a base material layer (10), a gas barrier layer (11), a thermoplastic resin layer (12), and a non-adsorbent coat layer (13). Are stacked in this order as the basic configuration.

<Base layer>
A plastic film can be used as the base material layer (10). The plastic film is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.). , Polyethylene, etc. can be used, and it is appropriately selected according to the product and contents.

A printing layer (14) is usually formed on the packaging material, but it is preferably formed between the base material layer (10) and the gas barrier layer (11) so that it can be seen from the outside. It is possible to improve the image as a product and display and print necessary information about the contents as needed.

There are no particular restrictions on the printing method and printing ink, but known printing methods, printability from printing inks to plastic films, designability such as color tone, adhesion, safety as a food container, etc. If it is taken into consideration, it may be appropriately selected, and for example, a gravure printing method, an offset printing method, a gravure offset printing method, a flexo printing method, or the like can be used. Above all, the gravure printing method can be preferably used in terms of the print finish and productivity.

<Gas barrier layer>
Further, a gas barrier layer (11) can be provided in the packaging material for the purpose of improving the storage stability of the contents. As a result, it is possible to suppress odor leakage of the contents to the outside and infiltration of oxygen and water vapor gas from the outside, and prevent deterioration of the contents.

As the gas barrier layer (11), a metal foil such as an aluminum foil or a laminated film of the metal foil and a plastic film can be used. In this case, excellent gas barrier properties can be obtained and light shielding properties can be obtained. Become.

Further, in the present invention, by applying a corona treatment on the gas barrier layer (11), the interlayer adhesive strength can be further improved. Further, if a stronger adhesive strength is required, an anchor coat layer can be provided.

<Thermoplastic resin layer>
The thermoplastic resin layer (12) can be sealed by fusing the thermoplastic resin layers to each other by heating and pressurizing. As the material of the thermoplastic resin layer (12), a polyolefin-based resin is generally used, specifically, a low-density polyethylene resin (LDPE), a medium-density polyethylene resin (MDPE), and a linear low-density polyethylene resin. (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, ethylene-methacrylic acid resin copolymer and other ethylene-based resins, polyethylene-polybutene blend resin, homopolypoly resin Polypropylene-based resins such as (PP), a propylene-ethylene random copolymer, a propylene-ethylene block copolymer, and a propylene-α-olefin copolymer can be used. In order to form the thermoplastic resin layer (12), a material formed on a film in advance can be laminated and laminated.

<Non-adsorbent coat layer>
The non-adsorbent coating layer (13) of the present invention is formed by applying, drying and curing the coating agent for forming a non-adsorbent layer of the present invention on the thermoplastic resin layer (12). Further, the non-adsorptive coat layer (13) is provided on the innermost layer in contact with the contents of foods, pharmaceuticals, cosmetics and the like.

The coating agent for forming a non-adsorbent layer (hereinafter abbreviated as "coating agent") of the present invention imparts non-adsorbability to a packaging material and contains a main agent, a curing agent and a dispersion medium. Here, the non-adsorptive property is a property that it is difficult to adsorb an active ingredient contained in foods, pharmaceuticals, cosmetics and the like. Examples of the active ingredient required to suppress adsorption include limonene contained in orange juice and the like as a volatile component, methyl salicylate contained in pharmaceutical products, l-menthol, dl-camphor and the like. Examples of the active ingredient that is required to suppress adsorption include various drugs used for anti-inflammatory analgesics and the like as non-volatile components, such as ketoprofen, flurbiprofen, and loxoprofen sodium hydrate.

<Coating agent for forming non-adsorption layer>
[Embodiment 1] is an example of a coating agent, and [Embodiment 2] is another example.

[Embodiment 1]
(Main agent)
The main agent is a polymer containing a nitrile group-containing acrylic monomer unit and a reactive functional group-containing acrylic monomer unit other than the nitrile group-containing acrylic monomer unit. The reactive functional group-containing acrylic monomer unit is an acrylic monomer unit having a reactive functional group (for example, a hydroxy group, a carboxyl group, an epoxy group, etc.) capable of reacting with the reactive functional group of the curing agent. Further, the main agent may contain a monomer unit other than the nitrile group-containing acrylic monomer and the reactive functional group-containing acrylic monomer unit.

Examples of the nitrile group-containing acrylic monomer include acrylonitrile and methacrylonitrile. Examples of the reactive functional group-containing acrylic monomer include a hydroxy group-containing acrylic monomer, a carboxyl group-containing acrylic monomer, and an epoxy group-containing acrylic monomer. From the viewpoint of easy control of the reaction rate, the reactive functional group-containing acrylic monomer is preferably a hydroxy group-containing acrylic monomer.

Examples of the hydroxy group-containing acrylic monomer include 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, hydroxypropyl acrylate and the like. Examples of the carboxyl group-containing acrylic monomer include acrylic acid, methacrylic acid, maleic acid, and itaconic acid. Examples of the epoxy group-containing acrylic monomer include glycidyl acrylate and glycidyl methacrylate. Other monomers include acrylic acid alkyl esters (eg, methyl acrylate, ethyl acrylate, etc.
Isopropyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, etc.), alkyl methacrylate esters (eg, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n methacrylic acid -Hexyl, lauryl methacrylate, etc.), aromatic vinyl (eg, styrene, vinyltoluene, etc.), vinyl acetate, acrylamide, N-methylolacrylamide, diacetoneacrylamide, dimethylaminoethyl methacrylate, etc. may be mentioned.

The content of the nitrile group-containing acrylic monomer unit in the main agent is preferably 15% by mass or more, and more preferably 15 to 40% by mass. When the content of the nitrile group-containing acrylic monomer unit is at least the above lower limit value, higher non-adsorption property can be obtained, and when it is at least the above upper limit value, the main agent can be easily dissolved or dispersed in the dispersion medium. , The coating agent can be easily prepared.

(Hardener)
The curing agent has a reactive functional group and reacts with the reactive functional group of the main agent to crosslink and cure the main agent. When the main agent has a hydroxy group-containing acrylic monomer unit, the curing agent is preferably a diisocyanate compound having an isocyanate group as the reactive functional group. Examples of the diisocyanate compound include aromatic diisocyanates such as tolylene diisocyanate and 4,4'-diphenylmethane diisocyanate, aliphatic diisocyanates such as xylylene diisocyanate and hexamethylene diisocyanate, and alicyclic diisocyanates such as isophorone diisocyanate. Further, it may be a polymer, derivative or mixture of these diisocyanate compounds.

The ratio of the main agent to the curing agent is the molar ratio of the reactive functional group (A) in the main agent and the reactive functional group (B) in the curing agent, and (B) / (A) is 2.0 or more and 5.0 or less. Is preferable. If (B) / (A) is at least the lower limit value, the main agent can be sufficiently cured, and if it is at least the upper limit value, blocking of the non-adsorption layer can be prevented.

(Dispersion medium)
The dispersion medium is a liquid that dissolves or disperses the main agent and the curing agent. As the dispersion medium, an alcohol solvent, a ketone solvent, an ester solvent, a glycol solvent, or a hydrocarbon solvent can be used. Examples of the alcohol solvent include methanol, ethanol, isopropanol, n-propanol, 1-butanol, 2-butanol and the like. Examples of the ketone solvent include acetone, methyl ethyl ketone, methyl isobutyl ketone, anone and the like. Examples of the ester solvent include ethyl acetate, n-propyl acetate, n-butyl acetate, isobutyl acetate and the like. Examples of the glycol-based solvent include butyl cellosolve and propylene glycol monomethyl ether. Examples of the hydrocarbon solvent include toluene, xylene, n-hexane, methylcyclohexane and the like.

[Embodiment 2]
The coating agent of the second embodiment is the same as that of the first embodiment except that the main agent and the curing agent are as follows.
(Main agent)
The main agent is a polymer containing an acrylic monomer having a hydroxy group (hereinafter, also referred to as “hydroxy group-containing acrylic monomer”) unit. The hydroxy group of the polymer reacts with the isocyanate group of the curing agent.

Examples of the hydroxy group-containing acrylic monomer forming the hydroxy group-containing acrylic monomer unit include 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, hydroxypropyl acrylate and the like. You can use more than seeds.

The polymer constituting the main agent preferably has a hydroxyl value measured based on JIS K0070 of 30 mgKOH / g or more and 150 mgKOH / g or less, and preferably 40 mgKOH / g or more and 90 mgKOH / g or less. When the hydroxyl value is at least the lower limit value, higher non-adsorption property can be obtained, and when it is at most the upper limit value, the amount of the curing agent required for crosslinking can be reduced, and the non-adsorption property formed by the coating agent can be obtained. It is possible to prevent layer blocking. The hydroxyl value of the polymer constituting the main agent can be adjusted by the content of the hydroxy group-containing acrylic monomer unit in the polymer.

As long as the hydroxyl value of the polymer constituting the main agent is within the above range, the content of the hydroxy group-containing acrylic monomer unit in the polymer is not particularly limited, but usually, the hydroxy group-containing acrylic monomer is used. The content of the unit is preferably 3 to 60% by mass, more preferably 5 to 55% by mass, and more preferably 10 to 50% by mass in 100% by mass of the total unit constituting the polymer. More preferred. In the present specification, the content of each monomer unit in the polymer is a value based on the amount of each monomer used in the polymer production, and is a value of the monomer used in the polymer production. It is the mass ratio (%) of the monomer when the total amount is 100 mass%.

(Hardener)
The curing agent has an isocyanate group and reacts with the hydroxy group of the main agent to crosslink the main agent and cure it. The curing agent is preferably a diisocyanate compound. Examples of the diisocyanate compound include aromatic diisocyanates such as tolylene diisocyanate and 4,4'-diphenylmethane diisocyanate, aliphatic diisocyanates such as xylylene diisocyanate and hexamethylene diisocyanate, and alicyclic diisocyanates such as isophorone diisocyanate. Further, it may be a polymer, derivative or mixture of these diisocyanate compounds.

The ratio of the main agent to the curing agent is such that the molar ratio of the hydroxy group (C) in the main agent and the isocyanate group (D) in the curing agent, (D) / (C) is 0.5 or more and 5.0 or less. It is preferably 0.8 or more and 3.5 or less, more preferably. If (D) / (C) is at least the lower limit value, the main agent can be sufficiently cured, and if it is at least the upper limit value, blocking of the non-adsorption layer formed by the coating agent can be prevented.

<Method of forming non-adsorbent coat layer>
Examples of the method for forming the non-adsorbent coating layer include a method of applying the above-mentioned coating agent on the surface of the thermoplastic resin (12) and drying it. The coating method is not particularly limited, and for example, a wire coating method, a roll coating method, a gravure coating method, a bar coating method, a die coating method, a curtain coating method and the like can be applied.

The coating thickness of the coating agent is preferably 0.05 to 10 μm, more preferably 0.1 to 5 μm, in terms of the thickness of the non-adsorbent layer after drying. If the coating thickness is at least the lower limit value, coating can be easily performed by a general-purpose coating device, and if it is at least the upper limit value, the coating amount is reduced, so that the cost can be sufficiently reduced.

As a drying method after coating, a hot air drying method, an infrared irradiation drying method, or the like can be applied. The drying temperature is preferably 40 to 120 ° C, more preferably 50 to 100 ° C. If the drying temperature is at least the lower limit value, the drying rate can be increased, and if it is at least the upper limit value, it is economical. After drying, a heat treatment may be applied to allow the main agent and the curing agent to sufficiently react with each other. The temperature of the heat treatment is preferably 30 to 100 ° C, more preferably 40 to 70 ° C.

<Heat sealing method>
By applying a coating agent for forming a non-adsorbent layer to the innermost layer in contact with the contents of the packaging material (1), a thin non-adsorbent coat layer is formed to form an active ingredient contained in foods, pharmaceuticals, cosmetics, etc. Adsorption is suppressed. However, since the coating agent for forming a non-adsorption layer of the present invention is inferior in heat-sealing property, it cannot be sealed by a heat-sealing method using a normal seal bar and cannot be made into a packaging bag. The heat sealing method of the present invention will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 shows a front view of a packaging bag (2) using the packaging material (1) of the present invention. In one example of the embodiment of the present invention, the outer peripheral edge of the packaging bag (2) and the inside of the outer peripheral edge are line-sealed to seal the four sides to make a bag. By applying a coating agent for forming a non-adsorbent layer to the innermost layer, laminated bodies having a thin non-adsorbent coat layer (13) formed are overlapped with each other facing each other, and all four sides are lined with a seal width of 1 mm (= a). The sealing portions are arranged in parallel at intervals of 2 mm (= b) and are heat-sealed. The number of wire seal portions (2), the seal width (a), and the seal interval (b) are not limited to these.

FIG. 3 is an enlarged view of the state of being heat-sealed by the line seal (21), and is a step in which laminated bodies having a thin non-adsorbent coat layer (13) formed are opposed to each other and superposed. A) and a step (B) in which the thermoplastic resins (12) sandwiching the non-adsorptive coat layer (13) are heat-sealed are included.

When the wire seal (21) is performed, the non-adsorbent coat layer (13) constituting the innermost layer of the laminated body and the thermoplastic resin (12) sandwiching the non-adsorbable coat layer are melted by heat and pressure, and the pressure is increased. And by adjusting the heat, only the non-adsorbent coat layer (13) is destroyed, so that the thermoplastic resins (12) are short-circuited and sealed by heat fusion. In the present embodiment, in order to strengthen the sealing portion by the thin wire seal, the wire seal is performed twice in parallel with an interval.

In a normal heat-sealing method, heat (160 to 180 ° C.), pressure (0.2 MPa), and a sealing time of 1 second are used to melt the seal width (7 to 15 mm) using a heat-sealing mold device. However, in the heat sealing method using the wire seal of the present invention, the innermost layer is not formed by performing the heat (160 to 180 ° C.) and pressure (0.5 MPa) and the sealing time of 1 second for the sealing width (1 mm). Only the adsorptive coat layer is destroyed, and it becomes possible to seal by heat fusion between the thermoplastic resins.

In this way, the non-adsorptive packaging material (1) provided with the non-adsorptive coat layer (13) of the present invention exhibits heat-sealing properties as well as non-adsorptive properties, so that packaging for packaging drugs and foods. It can be suitably used as a material. The packaging material (1) of the present invention may be used as it is in the form of a film, may be molded or processed into a bag shape, or may be used as a lid material or the like.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. In the following example, "part" means "part by mass" and "%" means "% by mass".

<Example 1>
First, the coating agent was prepared as follows.
In a reaction vessel equipped with a reflux condenser, a nitrogen introduction tube, a thermometer, a stirrer, a dropping funnel, etc., 100 parts of ethyl acetate, 300 parts of n-propyl acetate, and 300 parts of methyl ethyl ketone were charged and 90 ° C.
It was heated until it became, and the temperature was maintained. Next, while continuing to stir the inside of the reaction vessel, a mixed solution containing 80 parts of methyl methacrylate, 20 parts of 2-hydroxyethyl methacrylate and 3 parts of benzoyl peroxide was added dropwise at 90 ° C. for 3 hours. It was held for 1 hour. Then, an initiator solution prepared by dissolving 1.5 g of 2,2'-azobis (2-methylbutyronitrile) in 200 g of isopropyl alcohol was uniformly added dropwise at the boiling point over 2 hours and held for another 1 hour. As a result, the main agent was obtained. The solid content concentration of the obtained main agent is 10%, the mass average molecular weight is 32,000 (measured by GPC method by SHOWEX KF-80M manufactured by Showa Denko Corporation, polystyrene standard), and the hydroxyl value is 86 mgKOH / g (measured according to JIS K0070). The glass transition point was 94 ° C. (measured according to JIS K7121).

To 100 parts of the obtained main agent, 10 parts of a hexamethylene diisocyanate trimer solid content 75% ethyl acetate solution (manufactured by Nippon Polyurethane Industry Co., Ltd .: trade name Coronate HL) was added as a curing agent, and the mixture was stirred with a stirrer. , Obtained a coating agent. At this time, the molar ratio of the hydroxy group (A) in the main agent to the isocyanate group (B) in the curing agent was (B) / (A) = 2.0.

Next, a polyester base material 12 μm (Futamura Chemical Co., Ltd .: FE2001), an aluminum base material 7 μm (Toyo Aluminum Co., Ltd. 1N30), and a linear low-density polyethylene base material 40 μm (Futamura Chemical Co., Ltd .: XMTN) are bonded. As a non-adsorbent material, as described above, on a polyethylene base material of a laminate bonded with a main agent of an ester main chain (manufactured by Mitsui Chemicals Co., Ltd .: A525) and a curing agent (manufactured by Mitsui Chemicals Co., Ltd .: A52) as an agent. The coating agent prepared in 1 was applied using a wire bar so that the film thickness at the time of drying was 2 to 3 μm, and dried at 120 ° C. for 15 minutes to form a non-adhesive coat layer. The non-adsorption layers of the created laminated body are overlapped with each other, and the three sides are sealed so that the sealing width is 1 mm to form a three-way pouch. It was heat-sealed and sealed with a seal width of 1 mm (appearance is shown in FIG. 2).

The heat seal strength was measured with an RTF-1250 manufactured by A & D Co., Ltd. at a tensile speed of 300 m / min (JIS Z1707 compliant). In addition, under the condition of 40 ° C. and humidity-free, the product was stored for 1 month and then taken out, and the toner of the contents was taken out and the color of the liquid (white turbidity) was visually confirmed.

<Example 2>
The procedure is the same as in Example 1 except that the method for producing the coating agent is as follows.
In a reaction vessel equipped with a reflux condenser, a nitrogen introduction tube, a thermometer, and a stirrer, 100 parts of ethyl acetate, 300 parts of n-propyl acetate, and 500 parts of methyl ethyl ketone were charged and heated to 90 ° C. to maintain the temperature. .. Next, while continuing to stir the inside of the reaction vessel, a mixed solution containing 50 parts of methyl methacrylate, 20 parts of 2-hydroxyethyl methacrylate, 30 parts of acrylonitrile, and 3 parts of benzoyl peroxide was added to the reaction vessel at 90 ° C. for 3 hours. It was added dropwise and held for another 8 hours. As a result, the main agent was obtained. The solid content concentration of the obtained main agent is 10%, the mass average molecular weight is 30,000 (measured by GPC method by SHOWEX KF-80M manufactured by Showa Denko, polystyrene standard), and the hydroxyl value is 86 mgKOH / g (measured according to JIS K0070). The glass transition point was 93 ° C. (measured according to JIS K7121). To 100 parts of the main agent, 10 parts of a hexamethylene diisocyanate trimer solid content 75% ethyl acetate solution (manufactured by Nippon Polyurethane Industry Co., Ltd .: trade name Coronate HL) was added as a curing agent, and the mixture was stirred with a stirrer and coated. I got the agent. At this time, the molar ratio of the reactive functional group (C) in the main agent to the reactive functional group (D) in the curing agent was (D) / (C) = 2.0.

<Comparative Example 1>
This is the same as in Example 1 except that the line seal width at the time of creating the packaging bag is 10 mm.

<Comparative Example 2>
This is the same as in Example 1 except that the non-adsorption layer is not formed on the linear low-density polyethylene substrate.

Table 1 shows the evaluation results of the heat seal test, and Table 2 shows the appearance evaluation results of the contents.

<Discussion>
From the results of Examples 1 and 2, even if the non-adsorbent coat layer is the innermost layer, sufficient heat seal strength can be obtained by the line seal, and the color (white turbidity) of the lotion liquid remains as it is even after storage for 1 month. It was found to be retained and non-adsorbent. In Comparative Example 1, the heat seal strength was low, and it could not be made into a packaging bag. It is probable that since this was a normal wide seal, the non-adsorbent coat layer of the innermost layer could not be destroyed by heat sealing, and the seal by heat fusion of the thermoplastic resin layer could not be obtained. Further, in Comparative Example 2, since the thermoplastic resin layer is the innermost layer, the heat-sealing property is excellent, but there is no non-adsorption property, and the (medicinal effect) component in the lotion component is adsorbed by the thermoplastic resin layer. Made transparent.

From the above results, it was found that the packaging bag using the non-adsorptive packaging material of the present invention does not adsorb the aroma component and the medicinal component of the contents and exhibits strong heat-sealing strength.

1 ... Non-adsorptive packaging material 2 ... Non-adsorptive packaging bag 10 ... Base material layer 11 ... Gas barrier layer 12 ... Thermoplastic resin layer 13 ... Non-adsorptive coat layer 14 ...・ ・ Printing layer 20 ・ ・ ・ Contents 21 ・ ・ ・ Line seal part a ・ ・ ・ Line seal width b ・ ・ ・ Line seal interval

Claims (4)

It has at least a base material layer, a gas barrier layer, a thermoplastic resin layer, and a non-adsorptive coat layer formed by coating a coating agent for forming a non-adsorbent layer on the thermoplastic resin layer, and has the non-adsorbent coating layer. In a packaging material in which the sex coat layer is arranged so as to be in contact with the content storage space, and the peripheral portion is linearly heat-sealed to make a bag.
The peripheral portion is linearly heat-sealed, so that the non-adsorptive coat layer is destroyed by the heat and pressure, and the thermoplastic resins sandwiching the non-adsorbent coat layer are melted and sealed. A non-adsorptive packaging material characterized by that. The coating agent for forming a non-adsorption layer contains a main agent composed of a polymer, a curing agent having a reactive functional group, and a dispersion medium.
The polymer constituting the main agent contains a nitrile group-containing acrylic monomer unit and a reactive functional group-containing acrylic monomer unit having a reactive functional group capable of reacting with the reactive functional group of the curing agent.
The curing agent is a diisocyanate compound in which the reactive functional group is an isocyanate group.
The reactive functional group-containing acrylic monomer unit is a hydroxy group-containing acrylic monomer unit.
The content of the nitrile group-containing acrylic monomer unit in the main agent is 15 to 40% by mass.
Claim 1 is characterized in that the molar ratio of the hydroxy group (A) in the main agent to the isocyanate group (B) in the curing agent, (B) / (A) is 2.0 or more and 5.0 or less. The non-adhesive packaging material described in. The coating agent for forming a non-adsorption layer contains a main agent composed of a polymer, a curing agent having an isocyanate group, and a dispersion medium.
The polymer constituting the main agent contains an acrylic monomer unit having a hydroxy group, and has a hydroxyl value of 30 mgKOH / g or more and 150 mgKOH / g or less.
The claim is characterized in that the molar ratio (D) / (C) of the hydroxy group (C) in the main agent to the isocyanate group (D) in the curing agent is 0.5 or more and 5.0 or less. The non-adhesive packaging material according to 1. A packaging bag in which the non-adsorptive packaging material according to claim 1 is arranged so that the non-adsorbent coating layer is in contact with a space for accommodating the contents.

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