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Pressure-sensitive adhesive composition and pressure-sensitive adhesive product

A pressure-sensitive adhesive and composition technology, applied in the direction of adhesive type, ester copolymer adhesive, acid copolymer adhesive, etc., can solve the problem of large mixing amount of tackifier, limited mixing amount, etc. Unable to meet high standards, etc.

Inactive Publication Date: 2005-02-02
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] However, in a method of appropriately adjusting the molecular weight of an acrylic polymer, which is a base polymer of a pressure-sensitive adhesive, there is a limit in improving peeling and peeling performance (foaming and peeling resistance)
Moreover, in the method of adding a tackifier to the pressure-sensitive adhesive, since the blending amount of the tackifier is large, the transparency is reduced, and the blending amount is obviously limited.
Therefore, in this case, there are also limitations in improving the anti-shedding and peeling performance
Also with respect to tackified polymer formulations, they do not meet high standards due to their limited anti-flaking and peeling properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0100] In a separable flask, 97 parts by weight of butyl acrylate and 3 parts by weight of acrylic acid as monomer components, 0.3 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator and 233.8 parts by weight of ethyl acetate as a polymerization solvent, and the mixture was stirred for 1 hour while introducing nitrogen gas. After removing oxygen in the polymerization system in this way, the temperature was raised to 63° C., and the mixture was reacted for 10 hours to obtain a solid content of 30% by weight of an acrylic polymer solution (hereinafter sometimes referred to as “acrylic polymer Solution A"), the weight average molecular weight of the acrylate polymer in the acrylate polymer solution A (hereinafter sometimes referred to as "polymer A") was 550,000.

preparation example 2

[0102] An acrylic polymer solution with a solid content of 30% by weight (hereinafter sometimes referred to as "acrylic polymer solution B") was prepared in the same manner as in Preparation Example 1 of the acrylic polymer, except that 95 parts by weight of butyl acrylate and 5 parts by weight of acrylic acid in the body component, and 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator. The weight average molecular weight of the acrylate polymer in the acrylate polymer solution B (hereinafter sometimes referred to as "polymer B") was 700,000.

preparation example 3

[0104] An acrylic polymer solution with a solid content of 30% by weight (hereinafter sometimes referred to as "acrylic polymer solution C") was prepared in the same manner as in Preparation Example 1 of the acrylic polymer, except that 0.1 parts by weight of the initiator 2,2'-azobisisobutyronitrile. The weight average molecular weight of the acrylate polymer in the acrylate polymer solution C (hereinafter sometimes referred to as "polymer C") was 1,200,000. Therefore, the weight average molecular weight of acrylate polymer C exceeds 900,000

[0105] Preparation Example 1 of Oligomer

[0106] In a separable flask, 95 parts by weight of cyclohexyl methacrylate (the glass transition temperature of the homopolymer (polycyclohexyl methacrylate) is 66°C) and 5 parts by weight of of acrylic acid, 3 parts by weight of 2-mercaptoethanol as a chain transfer agent, 0.2 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 103.2 parts by weight of toluene...

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PUM

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Abstract

A pressure-sensitive adhesive composition contains (a) an acrylic polymer containing an alkyl (meth)acrylate whose alkyl group has from 4 to 12 carbon atoms, as a monomer major component and from 1 to 10 parts by weight, based on 100 parts by weight of the whole of the monomer components, of a carboxyl group-containing monomer as a monomer component and having a weight average molecular weight of from 500,000 to 900,000; and (b) an oligomer containing an ethylenically unsaturated monomer, in which a homopolymer formed therefrom has a glass transition temperature of from 60 to 190 DEG C. and which has a cyclic structure, as a monomer major component and from 1 to 10 parts by weight, based on 100 parts by weight of the whole of the monomer components, of a carboxyl group-containing monomer as a monomer component and having a weight average molecular weight of from 3,000 to 6,000.

Description

field of invention [0001] The present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive product. More particularly, the present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive product having excellent transparency and lifting and peeling resistance. Background of the invention [0002] In recent years, there have been applications for adhering and fixing optical films on transparent plastic substrates (for example, polycarbonate and acrylic) as substrates using pressure-sensitive adhesives or pressure-sensitive adhesive tapes or sheets resin base). In such applications, the pressure-sensitive adhesive or pressure-sensitive adhesive tape or sheet must not only be transparent to allow unhindered visibility of the transparent plastic bubbles and peelability) so that after weathering tests under severe conditions such as high temperature conditions, high temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C08L33/02C09J4/02C09J7/02C09J133/00C09J133/02C09J133/08C09J145/00
CPCC08L33/02C09J133/02C08L2205/02C08L2666/04C09J133/08
Inventor 户崎裕岸冈宏昭
Owner NITTO DENKO CORP
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