JPH0459395A - Information holding sheet - Google Patents

Abstract

PURPOSE:To easily release a sheet after adhering by providing an adhesive composition layer made of an unreleasable adhesive base and a filler at least on a part of a substrate sheet surface. CONSTITUTION:As a pressure-sensitive adhesive composition which never adheres in a normal state but tends to adhere under pressure, a natural rubber latex is suitably used in view of a resistance to blocking, a heat resistance, a wear resistance, and the like. As a particulate filler having no affinity for an adhesive base agent, a material having a small affinity with the aforesaid adhesive base agent, such as zinc oxide and titanium oxide, is used. For example, in the case of a threefold postal card, a part provided with an adhesive layer 2 on the rear surface thereof is folded along a dotted line 3 to be lapped over a part 4, and a part provided with an adhesive layer 1 on the top surface thereof is folded along a dotted line part 3' to be lapped over the adhesive layer 1 to be bonded thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sheet for information carriers having two facing surfaces which are temporarily adhered but can be easily peeled off when necessary. More specifically, the present invention relates to information carrier sheets suitable for use as flexible information sheets such as folding guards, overlapping guards, and information hiding sheets, size-expandable organizing sheets, printing paper, copying paper, and the like.

2. Description of the Related Art In recent years, with the revision of the Postal Law, a postcard system with confidentiality has been put into practical use and is beginning to become popular.

This secure postcard system folds a postcard containing various information such as personal matters or print information, glues the overlapping parts, and then mails the postcard to hide the information. This is a system in which the recipient peels off the overlapped portion again to read the hidden information.

Up until now, the adhesive method with this function has been to provide an adhesive layer on one side of a laminate of two transparent films that can be peeled in the middle, and cover this adhesive layer with release paper for concealment. Affix it to the lid, fill in the required information in the communication field, remove the release paper, stack it on the communication field, and paste it. After the recipient receives it, peel it off between the two transparent films. However, methods for reading information are known. However, since this type of system includes a film laminate for adhesive, there may be a difference in level between the laminate part and other parts of the sheet surface, or an increase in the thickness of the sheet as a whole. , when writing information on the sheet surface, there are problems such as not being able to feed the information smoothly to the printer, and printing with a non-impact printer such as xerography method is also difficult, and the laminate is expensive. In addition, there is the inconvenience of having to remove the release paper before use.

Problems to be Solved by the Invention The present invention eliminates the risk of blocking caused by adhesive due to stacking of sheets during storage, and allows for easy feeding to a printer and printing with various printers when writing information. The purpose of this invention is to provide an information carrier sheet that allows the subsequent sheet to be easily peeled off, has no risk of blocking even after peeling off, and has a double-page spread portion that allows writing and printing. be.

Means for Solving the Problems As a result of intensive research to develop an information carrier sheet having the above-mentioned preferable properties, the present inventor has found that at least a portion of the surface of the base sheet is coated with a non-peelable sheet that has been commonly used in the past. The authors discovered that they could achieve this goal by providing a layer of an adhesive composition consisting of an adhesive base and a particulate filler that has no affinity for the adhesive base, and based on this knowledge, Based on this, the present invention has been completed.

That is, the present invention provides a layer of an adhesive composition comprising a non-peelable adhesive base and a fine particulate filler having no affinity for the adhesive base on at least a portion of the surface of the base sheet. The present invention provides an information carrier sheet characterized by the following.

The information carrier sheet of the present invention can be used for various types of postcards such as three-fold postcards, half-fold postcards, and partially folded postcards.
Applies to cards, etc. One of these postcards, cards, etc.
For example, in the case of the three-fold postcard shown in Figure 1,
As shown in FIG. 5, first, the part on which the adhesive layer 2 is provided on the back side is folded along the dotted line part 3 and overlapped with 4.
The part on which the adhesive layer 1 is provided is folded along the dotted line 3', and the adhesive layer 1 is overlapped and bonded. In the case of a partially folded type postcard, as shown in Figs. 6 and 7, the part on which the adhesive layer 1 is provided on one side is folded along the dotted line 3', and the adhesive layer surfaces are overlapped and glued. It is something. In the case of the type shown in FIG. 4, an adhesive layer 1.2 is provided on the overlapping surface I, and these surfaces are overlapped and bonded.

The information carrier sheet of the present invention has been explained above using as an example a case where it is used as a postcard, but it can also be widely applied to various other notification cards. After printing the information, it is folded and an adhesive layer is attached to create a sheet with information on both the front and back sides, and when necessary, the adhesive side is peeled off and the information side is spread out on the same side. Depending on the folding form of the sheet, such as organization and storage, and the purpose of use, an adhesive layer may be applied to the entire surface or part of the front and back surfaces of the sheet, or to one side of the sheet.

In addition, in order to facilitate peeling after adhesion, the stacked sheets may be configured so that a step is created at the end opposite to the folded part of the sheets to form a finger grip, or It is also possible to form an unattached part to form a finger rest part.

Next, the adhesive composition that is the adhesive layer of the information carrier sheet of the present invention will be explained.

There are three types of adhesive compositions used in the sheets of the present invention: pressure-sensitive adhesive compositions, pressure-sensitive adhesive compositions, and rewetting adhesive compositions. An appropriate one is used. These are used as ordinary adhesives, and once bonded,
It is of a type that does not peel off again.

The pressure-sensitive adhesive composition has the property of adhering under pressure without adhering under normal conditions, and there are no particular restrictions on the adhesive base, and conventional adhesives such as natural rubber, synthetic rubber, etc. Any pressure-sensitive adhesive can be selected and used from among those commonly used for pressure-sensitive adhesives, but in particular, natural rubber latex obtained by graft copolymerizing styrene and methyl methacrylate to natural rubber is It is suitable in terms of blocking resistance, heat resistance, abrasion resistance, etc.

Further, the heat-sensitive adhesive composition has the property of not adhering under normal conditions but adhering with heat or heat and pressure, and there are no particular restrictions on the adhesive base, and conventionally Any adhesive can be selected from those commonly used in heat-sensitive adhesives, and vinyl acetate polymers are particularly preferred.

Further, the rewetting adhesive composition has a property of not adhering under normal conditions but adhering upon rewetting, and a water-soluble polymer compound is usually used as the adhesive base. The water-soluble polymer compound is not particularly limited, and those conventionally used in rewetting adhesives, such as polyvinyl alcohol and polyethylene oxide, are preferably used.

In the adhesive composition, the particulate filler having no affinity with the adhesive base includes those having low affinity with the adhesive base, such as zinc oxide, titanium oxide, calcium carbonate, kaolin, and activated clay. , spherical alumina, wheat starch, silica, glass powder, shirasu balloons, etc. are used. These materials may be used alone or in combination with
Although more than one type of filler may be used in combination, a combination of silica and other fillers is particularly preferred. Further, when two or more types of particles having different particle sizes are used in combination, the surface of the adhesive layer can be easily formed into an uneven shape, which is advantageous for improving the peeling performance. By adding the silica, the coating film of the adhesive can be strengthened, and since silica is porous, the adhesive easily adheres to the surface, making it easy to adjust the adhesion and peeling force. Even when printing is performed using a non-impact printer method depending on the printer used, the silica absorbs the silicone oil, so the adhesive layer will not become unadhesive due to the silicone oil. These fine particulate fillers have an average particle diameter of 1°ta and a prx~30t
tyrs is preferably in the range of 1 to 20/7++1.

The particulate filler can be used in any of pressure-sensitive adhesive compositions, heat-sensitive adhesive compositions, and rewet adhesive compositions, but in pressure-sensitive adhesive compositions and rewet adhesive compositions. 100 to 400 parts by weight, preferably 130 to 30 parts by weight of the fine particulate filler per 100 parts by weight of the adhesive base.
It is desirable that the amount is 0 parts by weight, more preferably 150 to 250 parts by weight.

On the other hand, in the heat-sensitive adhesive composition, 45 to 100 parts by weight, preferably 55 to 90 parts by weight, based on 100 parts by weight of the adhesive base.
It is desirable to blend it in a ratio of 60 to 80 parts by weight, more preferably 60 to 80 parts by weight. If the amount of the particulate filler is less than the above range, the blocking resistance will be poor and the adhesive force will be too strong, and if it exceeds the above range, the adhesive force will tend to be too low, which is not preferable.

In the adhesive composition used in the sheet of the present invention, it is necessary to appropriately select the blending ratio of the adhesive base used and the fine particulate filler.

The information carrier sheet of the present invention can be obtained by providing a layer of the adhesive composition on at least a part of the surface of the base sheet, and in particular, the surface of the adhesive composition layer may be coated with a layer of about 1 kg7 c.
It is preferable to apply pressure at a pressure of m"-10 kg/cm2 to press the excessive protrusion on the surface of the adhesive composition layer and to further improve blocking properties and print fixing suitability. Such an information carrier sheet is, for example, As shown in FIGS. 1 to 7, there are flexible postcards such as three-fold postcards, half-fold postcards, partially folded postcards, and overlapping postcards, and organizing sheets that can be expanded in size. It is used as printing paper, copying paper, etc., and particularly preferred is one in which at least a part of the layer of the adhesive composition serves as a concealing information writing surface.

Examples Next, the present invention will be explained in more detail with reference to examples.
The present invention is not limited in any way by these examples.

Note that adhesive strength, blocking resistance, and heat and abrasion resistance were determined as follows.

(1) Adhesive strength l After heating the test sample at 180°C for 2 seconds,
Dry sealer pressure is 50 ky/C! After adjusting the adhesive strength to 112 and bonding under pressure, the peel strength was measured.

(2) Adhesive strength 2 After heating the test sample at 180°C for 2 seconds, R
Using an I tester, 0.59/m2 of silicone oil was applied, the pressure of the dry sealer was adjusted to lobkg/cm'', and the peel strength was measured.

(3) Adhesive strength 3 The test samples were pasted together and heated at 180° using a heating device.
C. After heating for 2 seconds and cooling, the peel strength was measured.

(4) Adhesive Strength 4 5 to 10 g/1 m'' of water was applied to a test sample, immediately bonded together, and after drying, the peel strength was measured.

(5) Blocking resistance test sample adhesive side together, 500 g/c
A pressure of rm'' was applied and the peel strength was measured after being left at 50°C for 30 minutes.

(6) Heat resistance and abrasion resistance The adhesive surface was abraded with metal while applying a load of 200 to 500 g/c at a temperature of 150°C, and the degree of wear was measured.

Note that a tensile tester Autograph Model AGS50 manufactured by Takasugi Seisakusho Co., Ltd. was used to measure the peel strength.

In addition, each physical property was evaluated according to the following symbols.

◎: Excellent, O: Good, △: Fair, X: Not good Sheet using pressure sensitive adhesive composition Example I Natural rubber 1001! 5 parts by weight of a terpene resin as a tackifier is added to natural rubber latex obtained by graft copolymerizing 2 parts by weight of styrene and 10 parts by weight of methyl methacrylate (MMA) to form a base adhesive. A drug was prepared. Next, 50 parts by weight of silica gel having an average particle size of 4 μm and 150 parts by weight of wheat starch having an average particle size of 15 μm were added to 100 parts by weight of this base adhesive to prepare a pressure-sensitive adhesive composition.

This adhesive composition was then applied using a wire bar for 7
After coating 072g of high-quality paper with a coating amount of 509/I11" (solid content equivalent),
A test sample was prepared by drying at C for 1 minute, and each physical property was determined. The results are shown in Table 1.

Example 2 The same procedure as in Example 1 was carried out except that the amount of wheat starch in Example 1 was changed to 250 parts by weight.

The results are shown in Table 1.

Example 3 The same procedure as in Example 1 was carried out except that the amount of silica in Example 1 was changed to 100 parts by weight, and the amount of wheat starch was changed to 200 parts by weight. The results are shown in Table 1.

Example 4 The amount of styrene in Example 1 was changed to 8 parts by weight, and the amount of MMA was changed to 1 part by weight.
The same procedure as in Example 1 was carried out except that the amount was changed to 6 parts by weight. The results are shown in Table 1.

Example 5 The same procedure as in Example 4 was carried out except that the amount of wheat starch in Example 4 was changed to 250 parts by weight.

The results are shown in Table 1.

Example 6 The same procedure as in Example 4 was carried out except that the amount of silica in Example 4 was changed to 100 parts by weight and the amount of wheat starch was changed to 200 parts by weight. The results are shown in Table 1.

Example 7 NBR latex "Nipole 5161J (product name Nippon Zeon Co., Ltd., nitrile ratio 40% solid content 41%) 1
A base adhesive was prepared by adding 100 parts by weight of Nopco B-IJ (trade name: manufactured by San Nopco Co., Ltd., aliphatic petroleum hydrocarbon resin system, solid content 46%) as a tackifier to 00 parts by weight.

Next, to 100 parts by weight of this base adhesive] 7. 50 parts by weight of silica gel with an average particle size of 4 μm and an average particle size of 15 μm
Add 150 parts by weight of wheat starch [1. A pressure sensitive adhesive composition was prepared.

Next, apply this adhesive composition to 70% using a wire bar.
KY high-quality paper was coated with a coating amount of 509/1g2 (solid content equivalent), and after I-, it was heated to 109℃ at 100℃.
7. Each physical property was determined. The results are shown in Table 1.

Example 8 The NBR latex of Example 7 was replaced with SBR latex "Two-ball LX204J (Product 62, manufactured by Nippon Zeon Co., Ltd., Mechi 1
Example 1 was carried out in the same manner as in Example 7 except that the carbon ratio was changed to 55% and the solid content was 41%. Ta. The results are shown in Table 1.

Example 9 NBI of Example 7? Latex, chlorobrene latex fDENKA CHLOROPURENE LA-
50j (Product name: Nidenki Kagaku Kogyo Co., Ltd., solid content: 50%)
) was carried out in the same manner as in Example 7 except for t-. The results are shown in Table 1.

Comparative Example 1 A comparative example was carried out in the same manner as in Example 1, except that the amount of silica in Example 1 was changed to 30 parts by weight and the amount of wheat starch was changed to 60 parts by weight. The results are shown in Table 1.

Comparative Example 2 A test was carried out in the same manner as in Example 1 except that the amount of silica in Example 1 was changed to 60 parts by weight and the amount of wheat starch was changed to 30 parts by weight.The results are shown in Table 1.

Comparative Example 3 The amount of silica in Example 1 was changed to 200 parts by weight, and the amount of wheat starch was changed to 250 parts by weight.
I2 was conducted in the same manner as 17. The results are shown in Table 1.

〔note〕

Table 1: Adhesive force is too strong and cannot be accepted Book 2: Filler falls off from the adhesive surface. Sheet using heat-sensitive adhesive composition Example 10 Vinyl acetate copolymer #3316 (Japan 71 La Co., Ltd.) 1. Add 50 parts by weight of carbonic acid carbonate with an average particle size of 2 pm to 100 parts by weight (manufactured by Akebono Co., Ltd., trade name). After preparing a heat-sensitive adhesive composition Lt-, test samples were prepared in the same manner as in Example 1, and adhesive strength 3 and blocking resistance were determined. The results are shown in Table 2.

Example 11. ．． 12 In Example IO, instead of 50 parts by weight of norsium carbonate, 70 parts by weight of wheat starch with an average particle size of 15 μm (
1) in the same manner as in Example 10, except that 90 parts by weight of titanium oxide (Example 12) with an average particle size of 1 μm was used.
7 was carried out. The results are shown in Table 2.

Example 13 In Example 1O, vinyl acetate copolymer 4≠3316
Acetic acid/Hyl copolymer X-12-068E (
Using 1001i parts (manufactured by Zyden Chemical Co., Ltd., trade name),
and instead of 50 parts by weight of calcium carbonate, an average particle size of 15
The same procedure as Example 1O was carried out except that 50 parts by weight of μm wheat starch was used. The results are shown in Table 2.

Example 14.15 In Example 13, instead of 50 parts by weight of wheat starch, 90 parts by weight of zinc oxide having an average particle size of 1 μm (Example 14)
The same procedure as in Example 3 was carried out except that 90 parts by weight of silica having an average particle size of 4 μm (Example 15) was used. The results are shown in Table 2.

Comparative Example 4 The same procedure as in Example 10 was carried out except that the amount of calcium carbonate in Example 10 was changed to 20 parts by weight. The results are shown in Table 2.

Comparative Example 5 The same procedure as in Example 11 was carried out except that the amount of wheat starch was changed to 150 parts by weight. The results are shown in Table 2.

Comparative Example 6 Comparative example 6 was carried out in the same manner as in Example 13, except that the amount of wheat starch was changed to 15 parts by weight. The results are shown in Table 2.

Comparative Example 7 The same procedure as in Example 15 was carried out except that the amount of silica was changed to 120 parts by weight. The results are shown in Table 2.

Example 16 Water-soluble polymer compound [manufactured by Hikari Kako Co., Ltd., trade name, KR
954) After preparing a rewetting adhesive composition by adding 150 parts by weight of silica with an average particle size of 4 μm to 100 parts by weight, a test sample was prepared in the same manner as in Example 1,
Adhesive strength 4 and blocking resistance were determined. The results are shown in Table 3.

Example 17.18 In Example 16, 200 parts by weight of calcium carbonate having an average particle size of 2 μm (Example 14) was used instead of 150 parts by weight of silica.
), and 250 parts by weight of titanium oxide (Example 15) having an average particle size of 1 μm was used. The results are shown in Table 3.

Example I9 A rewetting adhesive composition was prepared by adding 180 parts by weight of silica having an average particle size of 4 μm to 9100 parts by weight of polyvinyl alcohol UP 240G manufactured by C Unitika Co., Ltd. (trade name), and the same as in Example 1 was prepared. Create a test sample with
Adhesive strength 4 and blocking resistance were determined. The results are shown in Table 3.

Example 20.21 In Example 18, 220 parts by weight of calcium carbonate having an average particle size of 2 μm (Example 16) was used instead of 180 parts by weight of silica.
), 250 parts by weight of activated clay with an average particle size of 1 μm (Example 1
The same procedure as in Example 18 was carried out except that 5) was used. The results are shown in Table 3.

Comparative Example 8 The same procedure as in Example 16 was carried out except that the amount of silica was changed to 70 parts by weight.
Shown in the table.

Comparative Example 9 The same procedure as in Example 16 was carried out except that the amount of silica was changed to 450 parts by weight.

The results are shown in Table 3.

Comparative Example 10 The same procedure as Example 20 was carried out except that the amount of calcium carbonate was changed to 80 parts by weight. The results are shown in Table 3.

Comparative Example 11 The same procedure as in Example 20 was carried out except that the amount of calcium carbonate was changed to 400 parts by weight. The results are shown in Table 3.

Effects of the Invention According to the present invention, by providing a layer of a special glue composition on at least a portion of the surface of the base sheet, there is no risk of blocking caused by the adhesive when the sheets are stacked during storage, and information It can be easily fed to a printer when writing and printed on various printers, and the sheet can be easily peeled off after adhesion.
An extremely easy-to-use information carrier sheet that does not cause blocking after peeling and has a double-page spread that allows writing and printing, has a lower cost compared to those using conventional adhesive film laminates. It can be economically advantageous in terms of manufacturing cost.

[Brief explanation of drawings]

FIGS. 1 to 4 are explanatory diagrams showing examples of different aspects of the postcard system with confidentiality, respectively, and FIGS. 5 to 7 are explanatory diagrams of the folded state of FIGS. 1 to 3. , In the figure, l is the surface adhesive layer, 2 is the back adhesive layer, 3,
3' is a fold line. 2nd 3rd

Claims (1)

[Scope of Claims] 1. A layer of an adhesive composition comprising a non-peelable adhesive base and a fine particulate filler having no affinity for the adhesive base is provided on at least a part of the surface of the base sheet. An information carrier sheet characterized by the following: 2. The information carrier sheet according to claim 1, wherein the adhesive composition is a mixture of 100 parts by weight of a pressure-sensitive or rewetting type non-peelable adhesive base and 100 to 400 parts by weight of a fine particulate filler. 3 The adhesive composition is a heat-sensitive non-peelable adhesive base 10
2. The information carrier sheet according to claim 1, wherein 45 to 100 parts by weight of a fine particulate filler is blended to 0 parts by weight. 4. The information carrier sheet according to claim 1, 2 or 3, wherein at least a part of the adhesive composition layer serves as a concealing information writing surface.