JP3029084B2 - Adhesive composition for forms and pressure-sensitive copying paper set - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention [relates] relates to pressure-sensitive copying paper sets with slip adhesive composition using a pressure-sensitive copying paper and it.

[0002]

2. Description of the Related Art In general, office paper such as slips and stationery using high-quality paper or pressure-sensitive copy paper as a form is widely used. For example, a slip using pressure-sensitive copying paper usually forms a set by combining upper paper, medium paper, and lower paper (pressure-sensitive copying paper), and a plurality of such sets are assembled into one book. Is composed of the slips.

[0003] As a method of setting a form, there is a method in which the form is spot-bonded or the side is line-bonded (back-bonded) with an adhesive. Until these forms are written or type-printed and used individually for paperwork, the sheets do not disassemble and can be separated without leaving adhesive or picking on the paper surface. Ideal. However, there is a problem in that even if spot or line bonding is performed using a general adhesive, it cannot be bonded well. That is, with a certain type of adhesive, the adhesive strength is weak and delamination of the paste occurs, or the adhesive is separated from one of the surfaces and separated immediately. In addition, some adhesives have a disadvantage that one of the paper surfaces is partially broken at the time of separation and transferred to the other surface because the adhesive force is too strong.

[0004] In order to solve such a problem, a method using a specific adhesive is disclosed in JP-A-49-99635,
JP-A-1-249635, JP-A-2-14129
No. 1 and JP-A-6-793, there is no problem in peeling at a low speed, but there is a problem in that if the film is rapidly removed, picking occurs on the paper surface. Further, there is a strong demand that stable adhesive strength can be maintained even at high humidity or high temperature.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an adhesive composition for forms which has excellent adhesiveness for forms and has less picking, and a pressure-sensitive copying paper set using the same. .

[0006]

The present inventors have solved the above-mentioned problems by including an aqueous adhesive and a modified silicone oil in an amount of 5 to 300% by weight based on the total solid content of the aqueous adhesive. The inventors have found that the present invention has been completed.

[0007]

The form used in the present invention is not particularly limited. For example, pressure-sensitive copying paper utilizing a color reaction between a leuco dye and a coloring agent, pressure-sensitive copying paper using a carbon sheet, or OCR A combination of paper, ink jet recording, electrophotographic recording, and the like and pressure-sensitive copying paper may be used.
Among them, the adhesive composition of the present invention is particularly excellent in setting properties for a form having a pressure-sensitive copying paper utilizing a color reaction between a leuco dye and a coloring agent. The adhesive composition of the present invention will be described for a form.

[0008] The form adhesive of the present invention may be, for example,
It has good permeability to the coated surface of pressure-sensitive copying paper consisting of medium paper and lower paper, and exhibits adhesive strength, but hardly to the uncoated surface without a coating layer. It has no permeability and acts to inhibit adhesion. Accordingly, a strong adhesive effect is exerted between the paper sheets where the coated surfaces are in contact with each other, and the adhesive force is not exerted between the sets where the non-coated surfaces are in contact with each other, but is merely a layer of the adhesive itself. Has a coupling effect of maintaining the coordination of the two, so that the practical effect is great in that this can be separated very easily for each set.

The adhesive composition of the present invention comprises a mixture of an aqueous adhesive and a modified silicone oil, and the ratio of the modified silicone oil is 5 to 5% based on the total solid content of the aqueous adhesive.
It is desirable to adjust the amount in the range of 300% by weight, more preferably in the range of 20 to 150% by weight. If the ratio of the modified silicone oil is less than 5% by weight, picking is likely to occur at the time of peeling, and if it exceeds 300% by weight, the adhesive strength of the adhesive is significantly reduced.

Specific examples of the water-based adhesive include salts of styrene-maleic anhydride copolymer, salts of ethylene-maleic anhydride copolymer, salts of isobutylene-maleic anhydride copolymer, and methyl vinyl ether-anhydride. Maleic acid copolymer salts, copolymers, polyethyleneimine, polyvinylpyrrolidone, polyacrylamide, polyvinyl alcohol, starches such as oxidized starch, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin , Casein, water-soluble adhesives such as gum arabic, natural rubber emulsion, synthetic rubber emulsion,
Styrene-butyl (meth) acrylate copolymer emulsion, styrene-butadiene copolymer emulsion,
Water-dispersible adhesives such as methyl (meth) acrylate-butadiene copolymer emulsion, vinyl acetate emulsion, ethyl (meth) acrylate-vinyl acetate emulsion, and polyurethane emulsion are exemplified. Among them, a natural rubber emulsion is preferable as the aqueous adhesive.

The modified silicone oil used in combination with the water-based adhesive is obtained by introducing an epoxy group, an amino group, a carboxyl group, or an alcoholic hydroxyl group into a side chain or terminal of dimethylpolysiloxane or hydrogenpolysiloxane. Epoxy-modified silicone oil, amino-modified silicone oil, carboxy-modified silicone oil, and alcohol-modified silicone oil are used.
Of these, epoxy-modified silicone oil and amino-modified silicone oil are preferred.

These modified silicone oils can be used after being emulsified or by introducing a hydrophilic group such as a polyether group other than the epoxy group to make them water-soluble.
Specific examples of such modified silicone oils include, for example, epoxy-modified silicone oils such as SM8715 manufactured by Toray Silicone Co., and PolonMF-11B and PolonMF-18 manufactured by Shin-Etsu Chemical Co .; SF-8421 manufactured by Toray Silicone Co., Ltd. BY16-845, BX16-86
3, epoxy polyether-modified silicone oils such as BX16-864 and BX16-865; SM-8702 manufactured by Toray Silicone Co., Ltd .; SM-8709; PolonMF-14, PolonMF-14D manufactured by Shin-Etsu Chemical Co., Ltd .;
Amino-modified silicone oil such as Polon MF-14E; alcohol-modified silicone oil such as SF-8427 manufactured by Toray Silicone; BY2 manufactured by Toray Silicone
And carboxy-modified silicone oil emulsions such as 2-820.

[0013] The specific adhesive composition for forms comprising such an aqueous adhesive and a modified silicone oil may contain, if necessary, a curing agent such as glyoxal or boric acid, or a pigment such as titanium oxide, calcium carbonate or zinc oxide. Is added.

[0014]

The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted thereto. or,
Unless otherwise specified, parts and% in the examples are parts by weight and% by weight, respectively.

[Problems to be Solved by the Invention] An object of the present invention is to use a pressure-sensitive copying paper which is excellent in adhesiveness for a form using pressure-sensitive copying paper and has less picking .
And a pressure-sensitive copying paper set using the same.

[Examples 2, 3, 4 and Comparative Examples 1, 2,
3] In Example 1, except that the solid content of the emulsion of the epoxy-modified silicone oil was changed as shown in Table 1,
A pressure-sensitive recording paper set was obtained in the same manner as in Example 1.

[Example 5] In Example 1, a solid concentration of 5% was used instead of the natural rubber emulsion having a solid concentration of 50%.
A pressure-sensitive copying paper set was obtained in the same manner as in Example 1 except that 0% styrene-butadiene-based latex was used.

Example 6 In Example 1, an amino-modified silicone oil (trade name: PolonMF-14) was used instead of the epoxy-modified silicone oil emulsion.
E, Shin-Etsu Chemical Co., Ltd.) to obtain a pressure-sensitive copying paper set in the same manner as in Example 1.

Example 7 Example 1 was repeated except that an alcohol-modified silicone oil (trade name: SF8427, manufactured by Toray Silicone Co., Ltd.) was used instead of the epoxy-modified silicone oil emulsion. A pressure-sensitive copy paper set was obtained.

[Examples 8, 9, 10 and Comparative Example 4,
5, 6] An emulsion of an epoxy-modified silicone oil having a solid content of 100 parts of a 20% aqueous solution of polyvinyl alcohol in a solid content of 30% (trade name: PolonMF-11)
B, Shin-Etsu Chemical Co., Ltd.) in the proportions shown in Table 1,
An adhesive composition for forms was obtained. This adhesive composition is glued on a self-coloring type pressure-sensitive recording sheet in a 1 mm wide line by a collating machine manufactured by Taiyo Kikai Co., Ltd., and then superposed on an optical reading sheet to set a pressure-sensitive copying paper. It was created.

Comparative Example 7 In Example 1, an emulsion of dimethylpolysiloxane oil (trade name: SH) was used instead of the emulsion of epoxy-modified silicone oil.
Pressure-sensitive copying paper set was obtained in the same manner as in Example 1 except that No. 7063, manufactured by Toray Silicone Co., Ltd.) was used.

Example 11 Optical reading paper (upper paper) provided with a microcapsule layer containing a leulo dye on the back surface, and a microcapsule layer containing a leuco dye on the back surface of a sheet provided with a color former layer In a pressure-sensitive recording set consisting of a middle sheet having a layer and a lower sheet having a developer layer, the adhesive composition of Example 1 was glued at a plurality of spots in a spot shape of 4 mm using a collating machine manufactured by Taiyo Kikai Co., Ltd. A pressure-sensitive copying paper set was prepared between the sheet and the middle sheet and between the middle sheet and the lower sheet. The adhesion between the upper paper and the middle paper was satisfactory without any problem and the peeling speed was good even when the peeling speed was increased, such as separation property, paper breakage, and adhesive residue. There was no problem in adhesiveness and separation between the middle and lower sheets.

The forms obtained in Examples 1 to 10 and Comparative Examples 1 to 7 were evaluated as described below, and the obtained results are shown in Table 1.

[Separability, Adhesion, Picking] A pressure-sensitive recording set comprising an optical reading paper (OCR paper) provided with a microcapsule layer containing a loilo dye on the back surface and a lower paper having a color developer layer is provided. At the time of peeling, the degree of separation, adhesiveness, picking, and adhesive residue uniformity of the adhesive composition were visually determined.

Judgment Criteria (Adhesiveness) A: OCR paper and lower paper are sufficiently bonded. Δ: OCR paper and lower paper are slightly adhered. X: OCR paper and lower paper hardly adhered. (Separability) A: OCR paper and lower paper can be easily separated. X: OCR paper and lower paper cannot be easily separated. (Picking) ：: The paper is not broken at all from the adhesive part when peeled Δ: The paper is slightly torn from the bonded portion when peeled. ×: The paper is torn from the bonded portion when peeled. (Uniformity of adhesive residue) ：: When peeled, the adhesive remains only on the lower paper. ×: The adhesive remains on the upper paper and the lower paper when peeled.

[0026]

[Table 1]

A is the weight ratio of the aqueous adhesive in the adhesive composition. B is the weight ratio of the modified silicone oil in the adhesive composition.

[Effect of the Invention] As is clear from the results in Table 1, the adhesive composition for forms using the pressure-sensitive copying paper of the present invention was excellent in adhesiveness and less picking.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-55-160075 (JP, A) JP-A-49-32936 (JP, A) JP-A-1-249871 (JP, A) JP-A-2- 141291 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09J 1/00-201/10 B41L 1/00-1/36 B42D 15/00 CA (STN) REGISTRY (STN)

Claims (3)

(57) [Claims] 1. An adhesive composition for forms using pressure-sensitive copying paper, comprising a water-based adhesive and a modified silicone oil in an amount of 5 to 300% by weight based on the total solid content of the water-based adhesive. 2. The pressure-sensitive copying apparatus according to claim 1, wherein the modified silicone oil is at least one selected from an epoxy-modified silicone oil and an amino-modified silicone oil.
Form adhesive composition using paper . 3. A pressure-sensitive copying paper utilizing a color reaction between a leuco dye and a color former is spot- or linearly bonded with the adhesive composition according to claim 1. Pressure-sensitive copy paper set.