JPH0149436B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a polyethyleneimine-long chain alkyl glycidyl ether-based stripping agent that has excellent heat resistance. PRIOR TECHNOLOGY When an adhesive tape is stored in the form of a roll, such as an adhesive tape with an adhesive layer on one side of a base material, and is unwound when used, it is easy to unwind it from its own back side. In order to do this, the back surface of the base material is subjected to a releasability imparting treatment using a releasability treatment agent. The general performance required for this removable treatment agent is:
Among various things, in particular, the release agent layer should not fall off from the base material (adhesion), and the components in the release agent layer should not migrate to the adhesive side and contaminate the adhesive surface (reducing the adhesive strength of the adhesive surface). It is important that the tape maintains releasability over time (including heat history) so that the tape can be smoothly rewound during use, and that it has adequate adhesion to its own back surface so that it can be layered. . Conventionally, as release treatment agents, heat-curable silicone-based ones, polyvinyl alcohol-octadecyl isocyanate-based ones (Japanese Patent Publication No. 7333-1983), and polyethyleneimine-octadecyl isocyanate-based ones (Japanese Patent Publication No. 17661-1977) have been used. , active hydrogen-containing polymer octadecyl isocyanate type (Japanese Patent Publication No. 34-3382), etc. were known. Problems to be Solved by the Invention However, heat-curing silicone-based tapes have superior releasability but poor adhesive strength, and their adhesive strength to their own backside is weak, making it impossible to apply tapes overlapping tapes, or to prevent tapes from being attached to rolled objects. However, there was a problem that the shape could be distorted, such as the bamboo shoot phenomenon. On the other hand, other materials such as those based on polyvinyl alcohol-octadecyl isocyanate have a problem of poor heat resistance. In other words, when an adhesive tape using a rubber-based adhesive is stored at a high temperature such as 50 to 70°C, the force required to peel it off from its own back surface during unwinding increases greatly, and the adhesive There were serious problems in practical use, such as the transition of the image to the back side. Means for Solving the Problems The present inventors have conducted intensive research in order to overcome the above problems and develop a releasability treatment agent that can perform releasability imparting treatment with excellent peel-adhesion balance and heat resistance. As a result of repeated research, it was discovered that the object could be achieved using a polyethyleneimine-long chain alkyl glycidyl ether system, and the present invention was completed. That is, the present invention provides a stripping agent comprising a reaction product of polyethyleneimine and a long-chain alkyl glycidyl ether. In the present invention, polyethyleneimine having a molecular weight of 1,000 to 100,000 is preferably used. If the molecular weight is too small, the resulting layer treated with the peelable treatment agent will have poor heat resistance, while if it is too large, it will be difficult to handle and the reaction will not proceed sufficiently. arise. On the other hand, long-chain alkyl glycidyl ethers include those in which the alkyl group has 16 to 20 carbon atoms, such as hexadecyl glycidyl ether, heptadecyl glycidyl ether, octadecyl glycidyl ether, nonadecyl glycidyl ether, and eicosyl glycidyl ether. Preferably used. The strippable treatment agent of the present invention is composed of a reaction product of polyethyleneimine and long-chain alkyl glycidyl ether, which is obtained by grafting a long-chain alkyl glycidyl ether to polyethylene imine based on an imine group and a glycidyl group. In the reaction, the long chain alkyl glycidyl ether is 0.8
It is appropriate to use it in a proportion of ~1.0 equivalent. If the equivalent ratio is too small, the resulting layer treated with the releasable treatment agent will have poor releasability (excessive adhesiveness), while if it is too large, unreacted long-chain alkyl glycidyl ether will remain. If the reaction solution is used as it is as a stock solution of a releasable treatment agent, the unreacted substances may become transferred substances and reduce the adhesive strength of the pressure-sensitive adhesive surface, which is not preferable. The obtained reaction product as a releasable treatment agent of the present invention is applied to a substrate as, for example, an organic solvent solution. Effects of the Invention According to the releasability treatment agent of the present invention, it is possible to perform releasability imparting treatment on a substrate with excellent release-adhesion balance and excellent heat resistance. Examples Example 1 Molecular weight was measured in a three-necked flask equipped with a reflux condenser.
Add 100 parts of a 20% by weight toluene solution of 1000 polyethyleneimine (parts by weight, the same applies hereinafter), add 155 parts of octadecyl glycidyl ether to make 80%
The reaction mixture was heated to ℃ and allowed to react for 10 hours under gentle stirring to obtain the desired reaction product. Next, toluene was added to the reaction solution containing this reaction product to obtain a stripping treatment agent-containing solution with a solid content of 1% by weight. Examples 2 to 5 100 parts of polyethyleneimine with a molecular weight of 1200 and 775 parts of octadecyl glycidyl ether (Example 2), 100 parts of polyethyleneimine with a molecular weight of 1800 and 620 parts of octadecyl glycidyl ether (Example 3), 100 parts of polyethyleneimine with a molecular weight of 10000 A stripping treatment agent-containing liquid was obtained in the same manner as in Example 1, except that 675 parts of eicosyl glycidyl ether (4), 100 parts of polyethyleneimine having a molecular weight of 30,000, and 840 parts of eicosyl glycidyl ether (5) were used. Comparative Example 1 A stripping treatment agent-containing liquid was obtained according to Example 1, except that 100 parts of polyethyleneimine having a molecular weight of 10,000 and 700 parts of octadecyl isocyanate were used. Comparative Example 2 A stripping agent-containing liquid was obtained in the same manner as in Example 1, except that 100 parts of polyvinyl alcohol having a molecular weight of 62,000 and a degree of saponification of 88% and 520 parts of octadecyl isocyanate were used. Evaluation test 0.05 g/m ² of the release agent obtained in the Examples and Comparative Examples was applied to one side of the corona-treated polyester film.
A film treated with releasability was obtained by coating the film in a coating amount of . Next, a polyester-based adhesive tape (manufactured by Nitto Electric Kogyo Co., Ltd., No. 31D) was attached to the treated film, and the film was left to stand for 24 hours under normal conditions or at 70℃ for 24 hours. The peeling force due to peeling was investigated. The results are shown in the table.

【table】

[Table] From the table, it can be seen that the treated layer using the peeling treatment agent of the present invention in Examples has a small increase rate in peeling force after heat treatment and has excellent heat resistance. It can be seen that the adhesive properties are excellent.

Claims (1)

[Scope of Claims] 1. A stripping treatment agent comprising a reaction product of polyethyleneimine and long-chain alkyl glycidyl ether. 2. The processing agent according to claim 1, wherein the polyethyleneimine has a molecular weight of 1,000 to 100,000, and the long chain alkyl glycidyl ether has an alkyl group of 16 to 20 carbon atoms. 3 Based on the imino group in polyethyleneimine, the long chain alkyl glycidyl ether is 0.8 to 1.0
The processing agent according to claim 1, which is blended in equivalent amounts.