Adhesive composition, adhesive layer, surface protective film, and optical member

A surface protection film and adhesive layer technology, applied in the direction of non-polymer adhesive additives, adhesive types, adhesive additives, etc., can solve problems such as difficult to suppress, difficult to obtain high cross-linking, to prevent Increased adhesion, excellent cross-linking stability, and high cross-linking degree

Active Publication Date: 2021-06-29
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the adhesive layer obtained by using a compound containing an iron atom as a metal catalyst can obtain high crosslinkability (crosslinkability) immediately after curing treatment (heat treatment), on the other hand, it is difficult to obtain a high crosslinkability during aging treatment. High crosslinkability (degree of crosslinking) or difficulty in suppressing color tone change of the adhesive layer due to coloration caused by iron atom-containing compounds (coloration based on metal complexes in iron atom-containing compounds)

Method used

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  • Adhesive composition, adhesive layer, surface protective film, and optical member
  • Adhesive composition, adhesive layer, surface protective film, and optical member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0109] Hereinafter, Examples etc. which specifically show the structure and effect of this invention are demonstrated, However, this invention is not limited to these Examples. In addition, the evaluation item in an Example etc. was measured as follows.

[0110]

[0111] 96.2 parts by mass of 2-ethylhexyl acrylate (2EHA), 3.8 parts by mass of hydroxyethyl acrylate (HEA), and 2 , 0.2 parts by mass of 2'-azobisisobutyronitrile, 150 parts by mass of ethyl acetate, introducing nitrogen gas while stirring slowly, keeping the liquid temperature in the flask at about 65°C and performing polymerization reaction for 6 hours, thereby preparing Acrylic polymer 1 solution (40% by mass). The weight average molecular weight (Mw) of the said acrylic polymer 1 was 540,000, and the glass transition temperature (Tg) was -68 degreeC.

[0112]

[0113] Put 98.5 parts by mass of 2-ethylhexyl acrylate (2EHA) and 1.5 parts by mass of 4-hydroxybutyl acrylate (4HBA) into a four-necked flask with...

Embodiment 2

[0126] A surface protection film was produced by the method similar to Example 1 except having used the acrylic polymer 2 instead of the acrylic polymer 1 used in Example 1.

Embodiment 3

[0128] A surface protection film was produced by the method similar to Example 1 except having used the acrylic polymer 3 instead of the acrylic polymer 1 used in Example 1.

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Abstract

The present invention relates to an adhesive composition, an adhesive layer, a surface protection film, and an optical member. The present invention provides an adhesive composition, an adhesive layer obtained by crosslinking the adhesive composition, a surface protection film obtained by forming the adhesive layer on a support, and an optical member protected by the surface protection film , the pot life of the adhesive composition is long enough, the crosslinkability (crosslinking degree) of the adhesive composition immediately after curing treatment and aging treatment is high, the color tone of the adhesive layer changes little, and can prevent The adhesive strength after pasting and storage of the adhesive layer increases. The adhesive composition of the present invention is characterized in that, relative to 100 parts by mass of the polymer (A) having an active hydrogen functional group, the adhesive composition contains an isocyanate crosslinking agent (B), 0.001 parts by mass to 0.4 parts by mass of the compound (C) having tin as the active center and 0.001 to 0.4 parts by mass of the compound (D) having iron as the active center.

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive layer, a surface protection film, and an optical member. More specifically, it relates to an adhesive composition having a sufficiently long pot life and high cross-linkability (cross-linking degree) immediately after curing treatment and after aging treatment, which can suppress changes in color tone and prevent adhesive strength after pasting storage. A rising adhesive layer, and a surface protection film obtained by forming the above-mentioned adhesive layer on a support. In particular, it is useful as a surface protection film used for the purpose of protecting the surface of optical members (such as polarizing plates, wave plates, retardation plates, optical compensation films, reflection sheets, and brightness enhancement films used in liquid crystal displays, etc.). of. Background technique [0002] In recent years, PSA sheets have been used in various aspects such as fixati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J11/06C09J7/30
CPCC09J7/30C09J11/06C09J133/066C09J2467/006C09J2433/00C08K5/205C09J183/04C09J175/04C09J133/00C09J7/20C09J11/00
Inventor 山形真人片冈贤一小川圭太夏井正赖天野立巳
Owner NITTO DENKO CORP
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