JPH0569687A - Peelable pressure sensitive adhesive composition and information carrier coated with said composition - Google Patents

Abstract

PURPOSE:To provide a sheet for information carrier which does not generate blocking, allows easy printing using a printer, can be easily peeled off after adhesion and again does not generate blocking even after being peeled off, with a pressure-sensitive adhesive composition with outstanding adhesive and peelable properties applied as a coating. CONSTITUTION:A pressure-sensitive adhesive composition is physically adjusted by adding 20 pts.wt. of silica gel with an average grain diameter of 5mum to 100 pts.wt. of pressure-sensitive base adhesive obtained by adding terpene resin viscosity-donating agent to natural rubber latex. This adhesive composition is applied to a triple-foldable sheet for postcard consisting of three sheet pieces 1, 4, 2 connected with folding perforations 5, 3 so that an adhesive layer 7 with a coat volume of 0.5g/m<2> is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peelable pressure-sensitive adhesive composition and a spread face formed by applying the pressure-sensitive adhesive composition, which is temporarily bonded but can be easily peeled off when necessary. The present invention relates to an information carrier sheet. Examples of the information carrier sheet include a folding card, a stacking card,
Examples include confidential information sheets such as information concealment cards, or dimensional-expandable organizing sheets, printing sheets, copying sheets, and the like.

[0002]

2. Description of the Related Art In recent years, with the revision of the Postal Law, a postcard system, which has a lower postage rate than a sealed letter and has the same confidentiality as a sealed letter, has been put into practical use and has begun to spread. This confidential postcard system prints or prints various inconvenient information that is inconvenient for others to fold, and overlays the various information display surfaces to bond them together so that the information is hidden and looks like a normal postcard. The concealed information displayed is read by mailing to the addressee and peeling off the adhesive surface on which the addressee has overlaid.

In such a postcard system having confidentiality, it is necessary to adhere the hidden information display surface in a peelable manner. In the conventional adhesive bonding method of this type, two transparent peelable sheets are joined together. An adhesive layer is provided on one surface of the film laminate, and the adhesive layer coated with release paper is attached to the concealing side paper piece, and the release information is printed or printed with the desired information on the concealment information display section. A known method is to remove the above-mentioned concealment side paper piece from the concealment information display part side and adhere it, and the addressee who receives it peels off the bonding surface of the two transparent films and reads the concealment information through the transparent film. Has been. Further, in order to prevent blocking during storage and transportation, an envelope form in which a pressure-sensitive adhesive prepared by mixing a specific adhesive with a minute hard substance having no thermoplasticity is applied is also proposed.

[0004]

However, in the conventional method using a laminate of two transparent films that are releasably joined together, this laminate is inevitably high in cost and is not suitable for use. The disadvantage is that the release paper has to be removed. On the other hand, in a conventional envelope form coated with a pressure-sensitive adhesive for blocking prevention, it is not possible to peel off the adhered part after once adhered,
There is a drawback that it is impossible to use it for a postcard system having confidentiality, because it is inevitable that a means for performing partial adhesion and providing a perforation for cutting and the like inside the adhered part to open it up is used.

Although a peelable pressure-sensitive adhesive has been proposed, the adjustment of the adhesive force and the peeling force is extremely delicate.
Adhesive force and peeling force changed due to various conditions such as printing, processing, printing and storage, and none of them satisfied both proper adhesion and peeling conditions.

The present invention solves the above-mentioned drawbacks in the prior art, and, first, it is a pressure-sensitive adhesive composition which does not cause blocking in inventory, is inexpensive, and has excellent adhesiveness and peelability. Secondly, by applying this pressure-sensitive adhesive composition, various printing suitability, feeding to a printer at the time of information writing, and print fixing on various printers can be easily performed, and a sheet after adhesion Can be easily peeled off, it can be peeled without damaging the printed surface and the printed image at the time of peeling, and there is no risk of blocking even after peeling, and pencils, writing inks, toner inks,
It is an object of the present invention to provide an information carrier sheet having a spread part that allows writing and printing with printing ink.

[0007]

In order to achieve the first object mentioned above, the present invention provides (a) a non-peeling adhesive base,
(B) A releasable pressure-sensitive adhesive composition containing a fine particulate filler having a non-affinity for this non-releasing adhesive base, wherein (100 parts by weight of component (a)) ( b) It is prepared by blending 20 to 130 parts by weight of the component.
As the component (a), a pressure-sensitive adhesive that does not normally adhere but can be adhered when a predetermined pressure is applied and cannot be peeled off after adhering is used, and it is generally used conventionally such as natural rubber and synthetic rubber. The natural rubber latex obtained by graft-copolymerizing styrene and methyl methacrylate on natural rubber is particularly suitable for blocking resistance, heat resistance and abrasion resistance. Is preferred.

The fine particulate filler exhibiting the non-affinity of the component (b) has a small affinity with the component (a), for example, zinc oxide, titanium oxide, calcium carbonate, kaolin, activated clay, spherical alumina. , Wheat starch, silica, glass powder, shirasu balloon and the like are used. These materials may be used alone (particularly suitable for silica) and may be used in combination of two or more kinds. Further, when two or more kinds having different particle sizes are used in combination, the surface of the adhesive layer can be easily formed in a concavo-convex shape, which is advantageous for improving the peeling performance. When silica is added, the coating film of the adhesive base can be strengthened, and the adhesive tends to adhere to the surface due to the porosity of silica, and the adhesive force and peeling force can be easily adjusted. Even when a non-impact printer is used for printing with a printer using silicone oil, silica absorbs the silicone oil, so that the adhesive layer does not become stuck due to silicone. These fine particulate fillers have an average particle size of 5 μm to 30 μm,
Preferably 7 μm to 20 μm, more preferably 10 μm
It is preferably in the range of ˜15 μm, but there may be 5 μm or less or 30 μm or more,
In this case, the fixability of toner and ink is improved. . Furthermore, the blending amount is determined in relation to the average particle size of the finely divided filler and the coating amount on the sheet, but it is also influenced by the proportion of the porous material such as silica, and the porous The same effect can be obtained even when the compounding amount is different between the case where the volatile substance is the main component and the case where the other substance is the main component, and the component (b) is added to the component (a) 100 parts by weight. 20 to 130 parts by weight is preferable, and when a porous material such as silica is mainly used, it is preferably 4
It is desirable to mix in an amount of 0 to 80 parts by weight, more preferably 50 to 60 parts by weight. If the blending amount of the component (b) is less than the above blending amount, the blocking resistance tends to be poor and the adhesive force tends to be too high. Thus, in the present invention, the (a) component and (b) used
It is necessary to appropriately select the mixing ratio with the components.

In order to achieve the above-mentioned second object, the present invention shows a non-affinity with (a) a non-peeling adhesive base and (b) with this non-peeling adhesive base. A releasable pressure-sensitive adhesive composition containing a fine-grained filler, which comprises 20 to 20 parts of (b) component per 100 parts by weight of (a) component.
The pressure sensitive adhesive composition obtained by blending 130 parts by weight and 0.5g / m ² ~5.0g / m ² coated with the information carrier sheet to sheet.

If the coating amount is 0.5 g / m ² or less, it is easy to peel off during normal handling, which causes a problem in practical use.
If it is m ² or more, the sheet is likely to be curled, and
0.5g / m
The range of ^{2 to} 5.0 g / m ² does not change the original properties of the sheet, and the smoothness is 20 to 1 according to JISP-8119.
The air permeability was 50 seconds, and the air permeability was 500 seconds or less according to JIS P-8117, which is suitable for printing.

This sheet for information carrier can be obtained by providing a layer of the above-mentioned adhesive composition on at least a part of the surface of the base sheet, and in particular, about 1 kg / cm ² to the surface of the adhesive composition layer. It is preferable to apply a pressure of 10 kg / cm ² to press excessive protrusions on the surface of the adhesive composition layer to further improve blocking properties and print fixing suitability. Such an information carrier sheet is, for example, a postcard having confidentiality such as a tri-fold postcard, a bi-fold postcard, a partially-folded type postcard and a type of postcard in which separate bodies are overlapped, and a size-extensible organizing sheet, It is used as a printing paper, a binding sheet for binding edges, and the like, and is particularly preferably applied to one in which at least a part of the layer of the adhesive composition described above is the hidden information writing surface.

When silica, activated clay, kaolin, or the like is used as the fine particulate filler, these can color with the electron-donating organic color-forming agent and form a color-developed image (color-developed image). It can also be used as a copy sheet.

[0013]

A peelable pressure-sensitive adhesive composition comprising (a) a non-peeling adhesive base and (b) a fine particulate filler having an incompatibility with the non-peeling adhesive base. A thing,
20 to 13 of (b) component per 100 parts by weight of (a) component
By blending 0 parts by weight, fine adjustment of the adhesive force is facilitated, printing suitability is excellent, blocking in stock is prevented, and feed, toner, and ink fixing in a non-impact printer are also good. the pressure sensitive adhesive composition 0.5g / m ² ~5.0g / m ² coated with the information carrier sheet may not occur a change in sheet inherent properties, ink even during peeling peeling surface, various information by the toner The peeling operation after the adhesion is surely performed without breaking.

[0014]

EXAMPLES Preferred examples of the adhesive composition of the present invention will be described below. Here, the adhesive strength, the high-advancement property, the blocking resistance and the heat resistance and abrasion resistance were determined as follows.

(1) Adhesive strength 1 180 test samples
After heating at 0 ° C. for 2 seconds, the pressure of a dry sealer (manufactured by Toppan Moore Co., Ltd.) was adjusted to 50 kg / cm ² and pressure bonding was performed, and then the peel strength was measured.

(2) Adhesive strength 2 180 test samples
After heating at ℃ for 2 seconds, 0.5g / m ^{2 of} silicone oil was applied with an RI tester, the pressure of the dry sealer was adjusted to 100 kg / cm ² and pressure bonding was performed, and then the peel strength was measured. ..

(3) High Progression The difference between the peel strength immediately after adhesion and the peel strength after storage at 50 ° C. for 3 days after adhesion was measured.

(4) Blocking resistance Adhesives of the test samples were put together, a pressure of 500 g / cm ² was applied, the mixture was allowed to stand at 50 ° C. for 30 minutes, and the peel strength was measured.

(5) Heat resistance and abrasion resistance 2 at a temperature of 150 ° C.
The surface of the adhesive was abraded with metal while applying a load of 00 to 500 g / cm ² , and the degree of wear was visually inspected.

A tensile tester Autograph AGS50 type manufactured by Shimadzu Corporation was used to measure the peel strengths of the adhesive strength 1 and 2, the high progress and the blocking resistance. Each sample has a uniform width of 25 mm, and each physical property is ◎:
Evaluation was made according to the symbols of excellent, ◯: good, Δ: acceptable, and x: not acceptable. Table 1 shows the results of the evaluations of the examples and the comparative examples described below. Generally, for adhesive strengths 1 and 2, 51
~ 100g / 25mm is very good, 31-150
g / 25 mm is good, 16-200 g / 25 mm is suitable, 15 g / 25 mm or less or 201 g / 25 mm
The above is not suitable. In addition, 30% for high progress
If it is below, it is very good, if it is 31 to 50%,
If it is 51 to 80%, it is suitable, and if it exceeds 80%, it is unsuitable. Regarding blocking resistance, 5.0 g / cm or less is extremely good, 5.1-10.0 g / cm is good, 10.1-15.0 g / cm is suitable, 15.1 g
/ Cm or more is not suitable. Furthermore, regarding heat resistance and abrasion resistance, it is extremely good if there is no change by visual observation and the worn area is 0, and it is very good if slightly worn and the worn area is 10% or less of the total area. Abrasion is recognized and the total area is 11
-30% is suitable, and a considerable amount of wear is visually observed, and it is unsuitable if the worn area is 31% or more of the total area.

Example 1 With respect to 100 parts by weight of natural rubber,
A natural rubber latex obtained by graft-copolymerizing 2 parts by weight of styrene and 10 parts by weight of methyl methacrylate,
A pressure-sensitive base adhesive was prepared by adding 5 parts by weight of a terpene resin tackifier. Next, to 100 parts by weight of this base adhesive, 20 parts by weight of silica gel having an average particle diameter of 5 μm was added to prepare an adhesive composition. Then, this adhesive composition was coated on a high-quality paper of continuous weight of 70 kg using a wire bar so that the coating amount was 0.5 g / m ² (solid content conversion), and then dried at 100 ° C. for 1 minute. Then, a test sample was prepared and each physical property was calculated.

Example 2 The procedure of Example 1 was repeated except that the amount of silica gel added in Example 1 was changed to 40 parts by weight and the coating amount was changed to 1.0 g / m ² .

Example 3 The same as Example 1 except that the average particle size of the silica gel in Example 1 was 8 μm, the addition amount was 60 parts by weight, and the coating amount was 2.0 g / m ^2. It was carried out.

Example 4 Example 4 was repeated except that the average particle size of the silica gel in Example 1 was 12 μm, the addition amount was 130 parts by weight, and the coating amount was 5.0 g / m ^2. It was carried out.

Example 5 The procedure of Example 1 was repeated, except that 10 parts by weight of corn starch having an average particle size of 15 μm was added in addition to the silica gel of Example 1.

Example 6 The procedure of Example 5 was repeated, except that the amount of corn starch added in Example 5 was changed to 40 parts by weight.

Example 7 The amount of silica gel added in Example 1 was adjusted to 30 parts by weight, 50 parts by weight of corn starch having an average particle size of 15 μm was added, and the coating amount was 1.0 g.
Example ² was carried out in the same manner as in Example 1 except that / m ² was changed.

Example 8 The amount of cornstarch in Example 7 was 100 parts by weight, and the coating amount was 5.0 g /
except for using m ² was performed in the same manner as in Example 7.

Example 9 In Example 1, the average particle size of silica gel was set to 8 μm, the addition amount was set to 50 parts by weight, and wheat starch 50 having an average particle size of 20 μm was used.
It was carried out in the same manner as in Example 1 except that parts by weight were added and the coating amount was changed to 3.0 g / m ² .

Example 10 The amount of wheat starch in Example 9 was 80 parts by weight, and the coating amount was 5.0 g / m ^2.
Example 9 was carried out in the same manner as in Example 9 except that

Example 11 The amount of silica gel added in Example 9 was 80 parts by weight, and the amount of wheat starch added was 2 parts.
Example 9 was carried out in the same manner as in Example 9 except that the amount was 0 part by weight and the coating amount was changed to 4.0 g / m ² .

Example 12 The procedure of Example 9 was repeated except that the amount of silica gel added in Example 9 was changed to 80 parts by weight and the coating amount was changed to 5.0 g / m ² .

Comparative Example 1 The procedure of Example 1 was repeated, except that the amount of silica gel added in Example 1 was changed to 15 parts by weight.

Comparative Example 2 The procedure of Example 1 was repeated except that the amount of silica gel added in Comparative Example 1 was changed to 15 parts by weight and the average particle size was changed to 12 μm.

Comparative Example 3 The procedure of Example 1 was repeated except that the amount of silica gel added in Example 1 was changed to 30 parts by weight and the coating amount was changed to 0.3 g / m ² .

Comparative Example 4 Example 4 was repeated except that the coating amount of silica gel in Example 4 was changed to 7.0 g / m ² .

Comparative Example 5 The same as Example 1 except that the amount of silica gel added in Example 1 was 150 parts by weight, the average particle size was 12 μm, and the coating amount was 5.0 g / m ^2. It was carried out.

Comparative Example 6 The procedure of Example 5 was repeated, except that the coating amount in Example 5 was changed to 0.3 g / m ² .

Comparative Example 7 The procedure of Example 8 was repeated except that the coating amount in Example 8 was changed to 7.0 g / m ² .

Comparative Example 8 The procedure of Example 10 was repeated except that the coating amount in Example 10 was changed to 6.0 g / m ² .

Comparative Example 9 Example 10 was repeated except that the amount of wheat starch added in Example 10 was changed to 100 parts by weight.
It carried out similarly to.

[0042]

[Table 1]

Next, an example in which an information carrier sheet having an adhesive layer formed by applying the adhesive composition as described above is applied to a postcard will be described with reference to the accompanying drawings. A postcard sheet to be a postcard is basically a three-fold sheet, a two-fold sheet, a folded sheet with a partial overlapping surface, and an overlap of two separate sheets. The configuration will be described. It should be noted that the application position of the adhesive is not limited to the following description, and there may be an unapplied portion, for example, the adhesive may not be applied to the marginal portion or the non-overlapping surface. Also, regarding the strength of the adhesive force in the adhesive layer, the strength may be different between the periphery and the inner part that is the hidden information description part, or the strength may be attached in a striped pattern,
Alternatively, it is possible to weaken the adhesive force at the peeling start portions such as corners and edges. Furthermore, in the case of a tri-fold sheet,
The overlapping surface on which the concealment information is not described may not be peelable, and in this case, a normal non-peeling adhesive can be used.

FIG. 1 shows a continuous sheet of one-fold three-fold postcard sheet 10, in which 100 parts by weight of the non-releasing adhesive base is applied to all the front and back surfaces without any affinity to the non-releasing adhesive base. 0.5 g of a releasable pressure-sensitive adhesive composition containing 20 to 130 parts by weight of a fine particulate filler exhibiting properties
/ M ^{2 to} 5.0 g / m ^{2 The} adhesive layer 7 formed by applying is provided. The adhesive layer 7 is preferably selected and used from those shown in each of the examples relating to the above-mentioned adhesive composition, but is not necessarily limited to those of each of the examples. As shown in FIG. 2, the address information 8 is printed on the front surface of the paper piece 1,
Concealment information 9 is printed on the surface of No. 4. Then, the piece of paper 2 is folded along the folding perforations 3 onto the piece of paper 4 so that the front surfaces overlap with each other, and the piece of paper 1 along the folding perforations 5 is overlapped with the bottom of the paper 4 such that the back surfaces overlap with each other. When pressure is applied to bond, the postcard has the concealment information 9 concealed as shown in FIG. Each piece of paper 2, 4
When the peeling is performed so as to open the eyes, the hidden information 9 is exposed and becomes visible.

FIG. 4 shows a sheet 10a for folded postcards.
The adhesive layer 7 is provided on the entire back surface, the concealment information 9 is printed on the back surface side of the paper piece 2a, and the address information 8 is printed on the front surface side of the paper piece 1a. Then, as shown in FIG. 5, by folding and adhering the respective paper pieces 1a and 2a along the folding perforations 5a such that the back surfaces overlap each other, a postcard in which the concealment information is concealed is obtained. Further, the partial folded postcard sheet 10b shown in FIG. 6 is provided with an adhesive layer 7 on a part of the surface thereof, the address information 8 is printed on the non-adhesive layer portion, and the adhesive layer 7 portion is concealed. Information (not shown) is printed. Then, as shown in FIG. 7, a small piece of paper 2b is folded and adhered to the front side of the large piece of paper 1b along the folding perforations 5b to form a postcard in which hidden information is hidden.

Furthermore, the postcard sheet 10 shown in FIG.
c is a non-overlapping surface of the paper piece 1c, in which an adhesive layer 7c is provided on the overlapping surface of the two separate paper pieces 1c, 2c and the overlapping surfaces are adhered to form a postcard. Address information 8 is printed on the paper, and concealment information 9 is printed on the surface of the paper piece 2c, which is the overlapping surface.

Next, variations of the above-described basic form will be described. However, these variations are in principle applicable to all the above-mentioned basic forms, and unless otherwise specified, only one basic form will be described. However, it does not prevent its application to other basic forms. Also, in the following description, the same components as those in the above-described embodiment will be described with the same reference numerals.

First, marginal portions are provided on both sides of each postcard sheet 10, 10a, 10c except the above-mentioned postcard sheet 10b, and the marginal holes 6 are provided at equal intervals here. As shown in FIG. 9, when each of the marginal holes 6 is formed in a perfect circle, the engagement and disengagement with the tractor pin is facilitated during transfer by the tractor, and the generation of paper dust is prevented. The perfect circle in the present specification means that the marginal hole 6 has no fine jagged irregularities on the periphery thereof, and the shape of the hole includes a shape such as a circle or an ellipse.

Further, as shown in FIG. 10, the postcard sheet 10c has a stacking surface side on each of the paper pieces 1c and 2c.
Opacity according to JIS P-8138 is 90% or more,
The concealment information 9 can be more surely concealed by providing the concealment layers 11 and 12 of preferably 95% or more, and more preferably 97% or more by means such as aluminum vapor deposition or printing. If the perforation 13 for cutting is provided at one end of the paper piece 1c, the peeling operation is easy.

FIG. 11 and FIG. 12 show the coating layer 1 for exposing the postcard sheet 10 in a superposed state and coating the adhesive layer 7 on the surface which comes into contact with the roller or the like which is the pressing means.
4 is provided. According to this configuration, the adhesive layer 7
Does not contact the roller or the like, and therefore the adhesive does not transfer to the roller or the like. The surface of the coating layer 14 is formed by coating a resin such as a transparent OP varnish, vinyl chloride, acrylic resin or the like, which is receptive to the toner and printing ink of the printer, or by bonding a resin film. It is preferable.

The postcard sheet 10a shown in FIG. 13 is obtained by applying adhesive layers 7a and 7b having different adhesive strengths, and the adhesive layer 7a having weak adhesive strength is provided on the folding perforation 5a and the peripheral portion. On the other hand, the remaining portion is provided with an adhesive layer 7b having a strong adhesive force, and further, the address information 8 is provided on the adhesive layer 7b coated surface of the paper piece 2a which is the same display surface as the concealment information 9 and the paper piece 1a described above. A transparent portion 15 is formed in a portion corresponding to the display portion of the address information 8. As shown in FIG. 14, when the folding perforations 5a are used to adhere the adhesive layers 7a and 7b of the paper pieces 1a and 2a to each other, the address information 8 can be visually recognized through the transparent portion 15. Since the adhesive layer 7a having weak adhesive force is provided on the folding perforation 5a and the peripheral portion, each paper piece 1a,
The peeling of 2a becomes easy. The transparent portion 15 may be replaced with a window portion cut out to obtain the same effect. Further, the adhesive layer 7 having a strong adhesive force on the peripheral portion
b may be printed and applied, and the concealment information 9 may be printed or printed on the inside thereof to stop the ink, and then the adhesive layer 7a having a weak adhesive force may be applied by printing onto the display portion of the concealment information 9. .. Further, as shown in FIGS. 15 and 16, when a postcard is formed by cutting out a part of the paper piece 1a corresponding to the address information 8 of the paper piece 1a, the address information 8 is exposed and visible. You may. These configurations do not necessarily have to be combined with the coating structure of the adhesive layers 7a and 7b having different adhesive strengths. In addition, the transparent portion 15 is a sheet that is formed by forming the postcard sheet 10a by a transparent or translucent sheet that satisfies the conditions such as printing, writing, and printability, and that satisfies the above-mentioned condition that is opaque except where the transparent portion 15 is formed. May be attached to each other, or the opaque portion may be formed of printing ink.

Next, another embodiment for adjusting the peeling force will be described. First, in the embodiment shown in FIG. 17, the adhesive layer 7 is entirely provided with the back surface side of the postcard sheet 1 divided into two sections of the paper pieces 1a and 2a by the folding perforations 5a as a superposing surface. The concealment information display portion 16 is formed by printing a dot-shaped print 17 (indicated by diagonal lines in the figure) on the adhesive layer 7 with a light color ink. In order to maintain the reliable adhesive strength of the adhesive layer 7, the aggregate area of the printed portions should be 75% or less of the superposed surfaces to be adhered, and preferably 5
0% or less is preferable. In the case of so-called solid printing, it is preferably 25% or less. By applying this printing 17, the adhesive force of the peripheral portion of each of the paper pieces 1a, 2a becomes stronger than the inner portion thereof. Note that the adhesive force can be adjusted by printing instead of the printing 17, or the printing configurations of the peripheral portion and the inner portion may be reversed so that the adhesive force of the peripheral portion is weaker than that of the inner portion.

In the embodiment shown in FIG. 18, each of the paper pieces 4, 2 on the front side of the postcard sheet 1 divided into three sections of the paper pieces 1, 4, 2 by the folding perforations 3, 5 is the first part. And the respective paper pieces 1 and 4 on the back side are used as the second superimposing surface, and the adhesive layer 7 is entirely provided on these superimposing surfaces. Then, the concealment information display portion 19 is provided on the first overlapping surface, while the three edges of the paper piece 2 excluding the portion along the folding perforations 3 are appropriately provided on the adhesive layer 7. The pattern is solid-printed with light-colored ink 18 (indicated by diagonal lines in the figure). Further, similar solid printing 20 is provided in a triangular shape at a corner portion of the paper piece 4 along the folding perforation 5a. As a result, the folding perforations 3 on the first overlapping surface are formed.
The adhesive force at the three edges excluding the portion along the line becomes weaker than the other portions, and particularly at the corners where the solid prints 18 and 20 overlap, the adhesive force becomes weaker. In addition, in these printing, it is more preferable from the viewpoint of releasability to use an ink or a medium ink to which a component such as a silicone resin or a wax that reduces the adhesive force is added.
Further, it is possible to adjust the adhesive force by printing instead of the solid printing 18 and 20, and various changes such as including the printed portion and the folding perforation 3 portion can be made.

When the solid printing 18, 20 and the application of the ink for reducing the adhesive force are provided in the processed portion such as the perforated portion and the marginal hole punching portion, the adhesive protrusion during the processing, the paper dust, etc. It is possible to prevent the occurrence of

In the embodiment shown in FIG. 19, the adhesive force is adjusted not by the above-mentioned printing or printing, but by the application pattern of the adhesive. The adhesive layer 7 is densely applied at the three edges except for the portion along the folding perforations 3 on the front surface side of each paper piece 4 and 2, and is roughly applied at the hidden information 9 display portion inside thereof. Therefore, the adhesive force of the dense portion 7c located in the peripheral portion is stronger than the adhesive force of the rough portion 7d located in the inner portion. It is also possible to reverse the coating pattern and weaken the adhesive force at the peripheral portion.

Although not shown, by changing the coating amount when forming the adhesive layer 7 for each superposed surface, for example, a difference of 3 g / m ^{2 or} less on the front surface side and the back surface side can be obtained. By coating, the peeling strength of the superposed surfaces can be made different. Further, a substance that suppresses the adhesive force on the adhesive layer 7, such as various waxes, silicone resins,
By applying a water-soluble polymer such as ethylene-maleic anhydride copolymer, various latexes such as vinylidene chloride, etc., wholly or partially, the releasability can be stably maintained for a long time. ..

Next, another embodiment for facilitating the peeling operation will be described. First, FIGS. 20 and 21 show a notch 2 for hooking a finger at an appropriate position on the edge of the piece of paper 1 and, if a folded part exists, at an appropriate position on the edge excluding the folded part.
1, 22 are provided. In addition, these notches 2
Initially, the slits 1 and 22 may be provided only with slits, and the addressee may peel off the slits to form the notches 21 and 22.

The embodiment shown in FIGS. 22 and 23 is applied to the three-fold postcard sheet 1, and the notch 23 is formed along the folding perforations of the paper pieces 4 and 2 that are folded in the middle of the sheet 1. , 24 are provided. According to these embodiments, the portions corresponding to the notches 23 and 24 are in the non-bonded state or the weakly bonded state, so that the peeling from this portion can be easily performed. It should be noted that, including the embodiments shown in FIGS. 19 and 20, each notch 21, 22, 23,
It is needless to say that the shape and the position of the 24 are not limited to those shown in the figure, and the finger-holding portion may be formed by forming the non-adhesive portion by changing the size of the overlapping sheet and forming the step. Is.

The embodiment shown in FIG. 24 is constructed so that the edges of the overlapping surfaces to be peeled off are bent to facilitate the peeling. That is, when the edge portion to be peeled off is bent, the adhered sheet surface is displaced to be in a peeled state, and the sheet can be easily peeled from the edge portion.

The folded portion in this case is 20 mm from the corner.
If it is set within the range, preferably within 15 mm, the deviation becomes remarkable, and the deviation is further generated when the bent portion is rounded and bent. The folding portion may be provided not only at the corner but also at the portion along the side of the edge, and in this case also, the folding portion is within 20 mm, preferably within 15 mm from the edge.

While various embodiments of the present invention have been described in various ways, it goes without saying that the present invention is not limited to the embodiments described above, and many more modifications can be made. ..

[0062]

As is apparent from the above description,
The pressure-sensitive adhesive composition of the present invention does not cause blocking in inventory, is applicable to non-impact printers, and can be manufactured at low cost. By applying a predetermined amount on at least a part of the sheet surface, blocking by the adhesive does not occur due to stacking when the sheets are stored, and it becomes easy to feed the information to the printer and print on various printers. In addition, an extremely easy-to-use information carrier sheet that can be easily peeled off after adhesion, does not cause blocking even after peeling, and has a spread part that allows writing and printing, The effect that the film can be provided at a lower cost than that using a conventional film laminate is obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a tri-fold postcard sheet.

FIG. 2 is a perspective view showing the folded state.

FIG. 3 is a cross-sectional view of the created postcard.

FIG. 4 is a plan view of a folded postcard sheet.

FIG. 5 is a perspective view showing the folded state.

FIG. 6 is a plan view of a postcard sheet that is partially folded.

FIG. 7 is a perspective view showing the folded state.

FIG. 8 is a perspective view showing a postcard sheet in which two separate pieces of paper are stacked.

FIG. 9 is a partially enlarged plan view showing an example of a marginal hole.

FIG. 10 is a cross-sectional view showing another example of postcard sheets in a superposed state.

FIG. 11 is a cross-sectional view showing another embodiment of the postcard sheet.

FIG. 12 is a cross-sectional view showing the folded state.

FIG. 13 is a plan view showing another embodiment of the postcard sheet.

FIG. 14 is a plan view showing the folded state.

FIG. 15 is a plan view showing another embodiment of the postcard sheet.

FIG. 16 is a plan view showing the folded state.

FIG. 17 is a plan view showing another embodiment of the postcard sheet.

FIG. 18 is a sectional view showing another embodiment of the same.

FIG. 19 is a sectional view showing another embodiment of the same.

FIG. 20 is a plan view showing a folded state of another embodiment of the invention.

FIG. 21 is a plan view showing a folded state of another embodiment of the invention.

FIG. 22 is a perspective view showing a folded state of another embodiment.

FIG. 23 is a perspective view showing a folded state of another embodiment of the invention.

FIG. 24 is a perspective view showing a folded state of another embodiment of the invention.

[Explanation of symbols]

1, 1a, 1b, 1c, 2, 2a, 2b, 2c, 4
Paper pieces 3, 5, 5a, 5b Perforations for folding 6 Marginal holes 7, 7a, 7b, 7c, 7d Adhesive layer 8 Address information 9 Concealment information 10, 10a, 10b, 10c Postcard sheets

Claims (3)

[Claims] 1. A peelable pressure-sensitive adhesive obtained by blending (a) a non-peeling adhesive base with (b) a fine-grained filler having an incompatibility with the non-peeling adhesive base. 20% of the component (b) per 100 parts by weight of the component (a).
A releasable pressure-sensitive adhesive composition containing 130 parts by weight. 2. The component (b) contains at least silica,
The releasable pressure-sensitive adhesive composition according to claim 1, which is contained in an amount of 20 parts by weight or more per 100 parts by weight of the component (a). The 3. A process according to claim 1 the pressure sensitive adhesive composition according, sheet coated with pressure sensitive adhesive composition characterized in that the 0.5g / m ² ~5.0g / m ² coating Information Carrier sheet.