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Surface protective film

A technology for protecting films and adhesive layers, applied in the direction of pressure-sensitive films/sheets, film/sheet-like adhesives, adhesive types, etc. Insufficient grade of light peelability, etc.

Active Publication Date: 2021-09-10
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, conventional surface protection films have the problem that air bubbles are likely to be generated if they are subjected to high-temperature and high-pressure treatment after being attached to an adherend and then returned to normal temperature and pressure.
In particular, surface protection films designed in such a way that the adhesive will harden in consideration of the application in applications requiring light peeling properties have the following problems: it is easy to generate fine particles caused by foreign matter, rough edges (burrs) at the processing end, etc. Bubbles (typically bubbles with a diameter of about several millimeters)
[0006] The surface protection film described in Patent Document 2 has the problem of heavy peeling and cannot be applied to applications requiring light peelability
[0007] The surface protection film for polarizing plates described in Patent Document 3 has the problem of preventing tunnel-like floating, and the level of light peelability is not sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0317] [Example 1]: Manufacture of adhesive composition (1) and surface protection film (1)

[0318] To the solution of the acrylic copolymer (1) obtained in Production Example 1, an organosiloxane ( KF-353, manufactured by Shin-Etsu Chemical Co., Ltd.) diluted to 10% by weight solution: 2 parts by weight (0.2 parts by weight in terms of solid content), bis(tris) as an antistatic agent, alkali metal salt (ionic compound) Lithium fluoromethanesulfonyl)imide (LiN(CF 3 SO 2 ) 2 : LiTFSI, manufactured by Tokyo Chemical Industry Co., Ltd.): 0.15 parts by weight, isocyanate-based crosslinking agent (trade name "CORONATE HX", manufactured by Tosoh Corporation): 3.4 parts by weight, as a crosslinking catalyst 0.006 parts, EMBILIZER OL-1 (manufactured by Tokyo Fine Chemical CO., LTD.): 0.01 parts, a solution of the methacrylic copolymer (2) obtained in Production Example 2, which is 0.2 parts by weight in terms of solid content, and then A polyoxyalkylene glycol compound (SANNIX G...

Embodiment 2

[0321] [Example 2]: Manufacture of adhesive composition (2) and surface protection film (2)

[0322] The amount of CORONATE HX was changed to 8.1 parts by weight in terms of solid content, and the amount of GP250 was changed to 3 parts by weight. In the same manner as in Example 1, an adhesive composition (2) and a surface Protective film (2).

[0323] The results are shown in Table 1.

Embodiment 3

[0324] [Example 3]: Manufacture of adhesive composition (3) and surface protection film (3)

[0325] The amount of CORONATE HX was changed to 12.8 parts by weight in terms of solid content, and the amount of GP250 was changed to 5 parts by weight. In the same manner as in Example 1, an adhesive composition (3) and surface Protective film (3).

[0326] The results are shown in Table 1.

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PUM

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Abstract

Provided is a surface protective film which has high adhesive strength and high light peeling resistance, and with which it is possible to curb the occurrence of air bubbles when subjected to high-temperature high-pressure treatment by an autoclave or the like after being affixed to an object to be coated (preferably an object to be coated having a consistent level of water contact angle of the surface) and is subsequently returned to room temperature and normal pressure. This surface protective film contains an adhesive layer and a base material layer, and when a free induction decay signal obtained by pulse NMR measurement of the adhesive layer is separated into two components by the nonlinear least squares method, the component with a short relaxation is defined as the hard component (S) and the component with a long relaxation is defined as the soft component (L), the ratio T2(L)60 / T2(L)30 of the spin-spin relaxation T2 (L)30 of protons of the soft component (L) measured at 30 DEG C and the spin-spin relaxation T2 (L)60 of protons of the soft component (L) measured at 60DEG C falls within the range of 2.15 to 3.05, shear adhesive strength is at least 10 N / cm2, and high-speed peel force does not exceed 0.8 N / 25 mm.

Description

technical field [0001] The present invention relates to surface protection films. Background technique [0002] In the manufacturing process of optical components and electronic components, in order to prevent surface damage during processing, assembly, inspection, transportation, etc., a surface protection film is usually attached to the exposed surface. Such a surface protection film peels off from an optical member and an electronic member when surface protection is unnecessary (patent document 1). [0003] In order to press-bond the surface protection film after sticking to the adherend, high-temperature and high-pressure treatment in an autoclave or the like may be performed. After performing such high-temperature and high-pressure treatment, it is necessary to return to normal temperature and pressure. [0004] However, conventional surface protection films have a problem in that air bubbles are likely to be generated when they are subjected to high-temperature and h...

Claims

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Application Information

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IPC IPC(8): B32B27/00B32B27/30C09J11/06C09J133/06C09J175/04C09J201/00C09J7/38
CPCB32B27/00B32B27/30C09J7/38C09J11/06C09J133/06C09J175/04C09J201/00C09J7/385C08K5/37C08F220/28C08J5/18
Inventor 越智元气山形真人
Owner NITTO DENKO CORP
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