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Solvent-type removable adhesive composition and removable adhesive product

A re-peeling and adhesive technology, which is applied in the direction of film/sheet adhesives, adhesives, etc., can solve the problems of increased haze, no adhesion, and contamination by adherends

Inactive Publication Date: 2012-01-25
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the Tg of the high Tg polymer is too high, due to the inherently low level of adhesive force, the adhesiveness becomes almost non-existent at low temperatures, cross-linking progresses over time, and adhesion to the adherend becomes impossible. bad situation
[0007] In addition, generally different types of polymers are incompatible even if they are blended, except for a small number of exceptions, and even if they are the same (meth)acrylic polymer, phase separation will occur
Adhesives with poor solubility in this way may have large haze when used as a coating, making them unsuitable as protective films for optical applications.
Furthermore, in order to prepare a protective film, when the adhesive composition is diluted with a solvent to a suitable viscosity for coating, it may become more likely to separate, and the adhesive composition may phase separate after being left for about a day, and it may be necessary to stir and mix again or change. problem of not being able to use
[0008] In addition, when the adhesive product is peeled from the adherend under harsh conditions, a part of the adhesive will remain on the adherend and cause the adherend to be contaminated, so it is required to improve the re-peelability
In addition, there is room for improvement in terms of adaptability (wettability) to adherends

Method used

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  • Solvent-type removable adhesive composition and removable adhesive product
  • Solvent-type removable adhesive composition and removable adhesive product
  • Solvent-type removable adhesive composition and removable adhesive product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] The present invention will be described in detail below through examples, but the present invention is not limited to these examples. In addition, in the following, if there is no special reason, "%" means "mass %", and "parts" means "mass parts".

Synthetic example 1

[0077] Synthesis example 1 (two-stage polymerization)

[0078] Use 70 parts of vinyl acetate (VAC) as a monomer for high Tg polymers and 210 parts of ethyl acetate as a solvent, mix well, and add to a thermometer, agitator, inert gas introduction tube, reflux condensation Flask and dropping funnel. Nitrogen gas was introduced while the internal temperature of the flask was raised to 75°C, and 0.09 parts of "Naipa (registered trademark) BMT-K40" (manufactured by Nippon Oil & Fat Co., Ltd.; m-toluyl peroxide and benzene peroxide as a polymerization initiator) The mixture of formyl) was put into the flask to initiate polymerization.

[0079] After 1.5 hours from the initiation of the reaction, 0.25 parts of "ABN-E" (manufactured by Nippon Durajin Industry Co., Ltd.; 2,2'-azobis (2-methylbutyronitrile)), and further aging at 76°C for 1.5 hours to obtain a polyvinyl acetate solution. The polymerization rate of vinyl acetate at this point in time was 73%.

[0080] Next, as monomers for...

Synthetic example 2

[0081] Synthesis example 2 (two-stage polymerization)

[0082] Use 100 parts of VAC as a monomer for high Tg polymer, and 185 parts of ethyl acetate as a solvent, mix well, and add to a thermometer, agitator, inert gas introduction tube, reflux condenser, and dropping funnel In the flask. While blowing nitrogen gas, the internal temperature of the flask was raised to 75°C, and 0.05 parts of the "ABN-E" was put into the flask to initiate polymerization.

[0083] Then, two-stage polymerization was carried out in exactly the same manner as in Synthesis Example 1, and adhesive polymer solution No. 2 was obtained. As a result of observing the adhesive layer obtained from this adhesive polymer solution No. 2 with an optical microscope, it was confirmed that it had a sea-island structure.

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Abstract

Disclosed is a solvent-type removable adhesive composition which comprises a high-Tg polymer (A) having a glass transition temperature (Tg) of 0 DEG C or higher, a low-Tg polymer (B) having a Tg lower than that of the high-Tg polymer and also having a pressure-sensitive adhesion property, and a solvent. In an adhesive layer produced by using the adhesive composition, the high-Tg polymer (A) and the low-Tg polymer (B) are not dissolved in each other and form a sea-island structure, wherein the high-Tg polymer (A) forms an island phase and the low-Tg polymer (B) forms a sea phase. The composition enables to form an adhesive layer having an excellent high-speed peeling property when used as a surface protection film for an optical film.

Description

Technical field [0001] The present invention relates to an adhesive product for re-peeling that is peeled off after being attached to an adherend and exhibits good peelability even under high-speed peeling, and a solvent for preparing the adhesive product Type adhesive composition. More specifically, it relates to an adhesive product for re-peeling used to protect the surface of optical members such as optical polarizers (TAC), retardation plates, EMI (electromagnetic wave) protective films, anti-glare films, and anti-reflection films. Background technique [0002] In liquid crystal displays and plasma displays, optical films with various functions, such as optical polarizers (TAC), retardation plates, EMI (electromagnetic wave) protective films, anti-glare films, and anti-reflection films, are laminated and used . In order to prevent damage to the surface of these optical films in the display manufacturing process or performance inspection stage, a protective film is attached ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J201/00C09J7/02
Inventor 齐藤允彦冈茂
Owner NIPPON SHOKUBAI CO LTD