JPS6053075B2 - adhesive paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to adhesive paper used in electrostatic copying, magnetic copying, etc. and general office use.

Conventional adhesive paper consisting of a release paper 3 having a top paper 1, a pressure-sensitive adhesive layer 2, and a release layer 4 as shown in FIG.
There are two types: (2) one in which high-quality paper is used as the top paper and glassine paper is used as the release paper base material, and (2) one in which high-quality paper is used for both the top paper and the release paper base material.

However, the former has problems in terms of copyability, especially when used in an electrostatic copying machine, and the latter has problems in terms of cost due to the increased amount of anchor coat and silicone applied, so neither is practical. It didn't make sense.

An object of the present invention is to provide a low-cost adhesive paper that has excellent copying suitability for electrostatic copying, magnetic copying, and the like.

More specifically, the object of the present invention is to provide a paper that has good copying properties, particularly running suitability, has appropriate surface roughness on both the top and back surfaces as an adhesive paper, and has no difference in physical properties between the top paper and the release paper. The difference is small, and even when used or stored in a high humidity environment, the difference in elongation rate between the two papers is small enough that the curling phenomenon of adhesive paper does not occur, and even when used or stored in a low humidity environment, both papers are It is an object of the present invention to provide a paper in which the difference in shrinkage rate of paper is small enough not to cause the curling phenomenon of adhesive paper.

A further object of the present invention is to provide a low-cost adhesive paper in which the adhesive or release agent is uniformly applied to the release paper base material and the amount of application is small. .
The adhesive paper of the present invention which achieves the above objects and has these properties uses, for at least one of the top paper and the release paper base material, a single-gloss paper made by a paper machine equipped with a Yankee dryer; It is obtained by forming a pressure-sensitive adhesive layer or a release surface on the glossy surface of single-gloss paper. In the present invention, the Yankee paper machine that produces single-sided glossy paper is a paper machine that has one large-diameter dryer in the drying section, and the wet paper is pressed against the Yankee dryer surface with a pressure roll to obtain a strong single-sided gloss. It is something that can be done.

The single gloss paper used in the present invention is pure white roll paper (roll paper made mainly of bleached kraft valves), S roll paper (roll paper made mainly of unbleached or semi-bleached chemical valves), and G roll paper (roll paper made mainly of unbleached or semi-bleached chemical valves). (Roll paper with 30% or more of chemical valves mixed with ground wood valves as the rest), single-gloss bleached kraft paper, pure white wrapping paper, etc. Paper made with Yankee paper machines (Fourdrinier, short-net, circular-mesh type) Bye.

Single-gloss paper made with a Yankee-style dryer is
It has long fibers and is difficult to curl. The pressure sensitive adhesive used in the present invention may be one commonly used,
Water-based natural rubber latex, synthetic rubber latex, acrylic resin emulsion; solvent-based natural rubber, synthetic rubber, polyisobutylene, polyvinyl alkyl ether, acrylic ester copolymer, etc. can be used. The release agent used in the release paper may be any commonly used release agent, such as silicone resin. In the present invention, adhesive paper in which the above-mentioned single-gloss paper is used as the release paper base material and adhesive paper in which the above-mentioned single-gloss paper is used as both the top paper and the release paper base material are particularly excellent, and have the following advantages. have

Glassine release paper exhibits greater elongation than the top paper under high humidity and curls significantly toward the top paper, and under low humidity the release paper exhibits greater shrinkage than the top paper and curls significantly toward the release paper. Conventional adhesive used. - Does not have paper deposit defects.

Therefore, the adhesive paper of the present invention has stable runnability even when used or stored in a copying machine that is placed in a poor environment, that is, under high or low humidity. In the adhesive paper of the present invention in which the above-mentioned single-gloss paper is used as at least the release paper base material, since both the top paper and the release paper base material are made of substantially the same material, curl fluctuations due to environmental changes are reduced.

In addition, since a single gloss paper is used as the release paper base material and silicone resin is coated on the glossy side of the paper, a very small amount of anchor coating treatment is applied to prevent the silicone resin from penetrating the back side. prevention, and manufacturing costs are low. Furthermore, unlike conventional adhesive paper that uses glassine paper as a release paper base, the back side of the release paper base has a smoothness comparable to or lower than that of general high-quality paper, making it suitable for copying machines. When in use, there is no slippage during paper feeding and stable running performance can be achieved. When the above-mentioned single-gloss paper is used as the top paper of the adhesive paper, it becomes easier to uniformly apply the pressure-sensitive adhesive layer, the amount of coating is reduced, and the thickness of the coating film is easily controlled, making it easier to apply the pressure-sensitive adhesive layer on the entire adhesive paper. The thickness can also be made uniform. Examples of the present invention are shown below.

Example 1 The top paper is pure white roll paper “゜Oji Paper Co., Ltd. 0K pure white゛Basic weight 4
5y/Rfl was used, and the release paper had a glossy surface with a 0K pure white basis weight of 45g/I, similar to the top paper, and this glossy surface was anchor-coated with a solvent-resistant additive. Silicone resin (Shin-Etsu Silicone Co., Ltd., KS-
705F'), and the adhesive was an acrylic pressure-sensitive adhesive (Dainippon Ink Co., Ltd., DIC Blast PSX).
-102-D) and apply the adhesive to the release paper after drying.
It was coated so as to have f/d and laminated with a top paper to obtain adhesive paper.

The thus obtained adhesive paper showed little curl variation due to environmental changes, and as a result of a copy test carried out using an electrostatic copying machine, it had good runnability. The results are shown in Table-1. Example 2 The top paper is made of high quality paper Oji Paper ゜゜゜Sunflower゛Basic weight 52
．． 3y/a was used, and the release paper was ゜゜Starback A゛Basic weight 40g/a made by Marusumi Paper Co., Ltd., which was manufactured by Marusumi Paper Co., Ltd., and the glossy surface was anchor-coated with a solvent-resistant additive.
A silicone resin was coated thereon in the same manner as in Example 1, and an acrylic pressure-sensitive adhesive was used as adhesive paper to obtain adhesive paper.

Curl fluctuations of the thus obtained adhesive paper due to environmental changes were quite small, and copying tests using an electrostatic copying machine showed that the paper had good runnability. The results are shown in Table-1.

Comparative Example 1 The top paper was made of high-quality paper, Sanyo Kokusaku Valve's "Silver Ring", basis weight 52.
3y/A was used, and the release paper was glassine paper made by Jujo Paper Industries, ゜゜゜glassine thick, basis weight 64f1/Rrt, and a solvent-resistant additive was anchor-coated thereon, and the same method as in Example 1 was applied. A silicone resin was applied to the paper, and an acrylic pressure-sensitive adhesive was used as the adhesive to obtain adhesive paper.

Table 1 shows the results of a copy test of the adhesive paper thus obtained using an electrostatic copying machine. Comparative Example 2 Foam paper (manufactured by Nippon Valve) for top paper and release paper base material
Using a basis weight of 52.3 fI/d, a release paper base material was anchor-coated with a solvent-resistant additive, and a silicone resin was coated thereon in the same manner as in Example 1, and an SBR-based adhesive was used. A pressure-sensitive adhesive was used to obtain adhesive paper.

Table 1 shows the results of a copy test of the adhesive paper thus obtained using an electrostatic copying machine.

As can be seen from the results in Table 1, the adhesive paper according to the present invention (Examples 1 and 2) has better curling properties, fixing properties, and runnability in electrostatic copying machines, and curling properties during storage compared to conventional adhesive papers (comparison). It is clear that it is much better than Examples 1 and 2).

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of adhesive paper.

Claims (1)

[Claims] 1. In an adhesive paper having a structure in which a top paper having an adhesive layer and a release paper having a release surface are laminated with the adhesive layer and the release surface in contact, at least the base material of the top paper and the release paper On the other hand, adhesive paper is characterized in that it uses single-sided paper made by a paper machine, and has an adhesive layer or a release surface formed on the binding surface of the single-sided paper.