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Urethane-based pressure-sensitive adhesive and surface protective film using the pressure-sensitive adhesive

A technology based on pressure-sensitive adhesives and polyurethane-based resins, used in polyurea/polyurethane adhesives, adhesives, pressure-sensitive films/sheets, etc. question

Active Publication Date: 2014-03-26
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, conventional urethane-based pressure-sensitive adhesives involve problems of poor initial wettability of pressure-sensitive adhesives
Easy to produce adhesive residue on the adherend
[0011] In addition, the wetting rate of conventional polyurethane-based pressure-sensitive adhesives may not be large
Also, in surface protection films using conventional urethane-based pressure-sensitive adhesives in their pressure-sensitive adhesive layers, unevenness in appearance may occur due to orange peel

Method used

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  • Urethane-based pressure-sensitive adhesive and surface protective film using the pressure-sensitive adhesive
  • Urethane-based pressure-sensitive adhesive and surface protective film using the pressure-sensitive adhesive
  • Urethane-based pressure-sensitive adhesive and surface protective film using the pressure-sensitive adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0228] 100 parts by weight of the polyol (A) were PREMINOL S3015 (manufactured by ASAHI GLASS CO., LTD., Mn=15000), which is a polyol having 3 OH groups, a polyfunctional isocyanate compound (B) 13 parts by weight of an adduct of trimethylolpropane / toluene diisocyanate trimer (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: CORONATE L), 0.04 parts by weight of a catalyst (manufactured by NIHON KAGAKUSANGYO CO., LTD., trade name: Nacem Ferric Iron) and 210 parts by weight of ethyl acetate as a dilution solvent were mixed, and then dispersed using stirring with a mixer to provide a polyurethane-based pressure-sensitive adhesive composition. The obtained polyurethane-based pressure-sensitive adhesive composition was applied to a base material "Lumirror S10" (thickness: 38 μm, manufactured by Toray Industries, Inc.) formed of polyester resin with a dipping roller so that the After drying, its thickness was 12 μm, and then the composition was cured and dried un...

Embodiment 2

[0232] A pressure-sensitive adhesive layer formed of a polyurethane-based pressure-sensitive adhesive (2) was produced on a substrate in the same manner as in Example 1 except that 100 parts by weight of PREMINOL S3011 (manufactured by Asahi Glass Co., Ltd., Mn=10000) was used as polyol (A); and 10 parts by weight of trimethylolpropane / toluene diisocyanate trimer adduct (manufactured by Japan Polyurethane Industry Co., Ltd. , trade name: CORONATE L) was used as the polyfunctional isocyanate compound (B).

[0233] Next, the silicone-treated surface of a 25 μm-thick substrate formed of a polyester resin and one surface of which was silicone-treated was attached to the surface of the pressure-sensitive adhesive layer to provide a surface protective film ( 2).

[0234] Table 1 shows the evaluation results.

Embodiment 3

[0236] A pressure-sensitive adhesive layer formed of a polyurethane-based pressure-sensitive adhesive (3) was produced on a substrate in the same manner as in Example 1 except that 75 parts by weight of PREMINOL S3015 (manufactured by Asahi Glass Co., Ltd., Mn=15000) and 25 parts by weight of SANNIXGP-1500 (manufactured by Sanyo Chemical Industries, Ltd., Mn=1500) which is a polyol having 3 OH groups used as polyol (A); and 28 parts by weight of trimethylolpropane / toluene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: CORONATE L) was used as polyfunctional isocyanate compound (B).

[0237] Next, the silicone-treated surface of a 25 μm-thick substrate formed of a polyester resin and one surface of which was silicone-treated was attached to the surface of the pressure-sensitive adhesive layer to provide a surface protective film ( 3).

[0238] Table 1 shows the evaluation results.

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Abstract

Provided is a urethane-based pressure-sensitive adhesive. Also provided is a surface protective film using such urethane-based pressure-sensitive adhesive. Further provided is an optical member or electronic member to which such surface protective film is attached. The urethane-based pressure-sensitive adhesive of the present invention is a urethane-based pressure-sensitive adhesive including a polyurethane-based resin, in which: the polyurethane-based resin includes a polyurethane-based resin obtained by curing a composition containing a polyol (A) and a polyfunctional isocyanate compound (B); and the polyol (A) contains a polyol (A1) having 3 OH groups and a number-average molecular weight Mn of 8,000 to 20,000.

Description

technical field [0001] The present invention relates to a polyurethane-based pressure-sensitive adhesive. Although the polyurethane-based pressure-sensitive adhesive of the present invention is generally known to have a high degree of increase in adhesion over time, the pressure-sensitive adhesive is excellent in reworkability and extremely excellent in initial wettability. For example, when the polyurethane-based pressure-sensitive adhesive of the present invention is attached to an adherend immediately after the separator is peeled off, the entrainment of air bubbles can be effectively suppressed because the pressure-sensitive adhesive is extremely excellent in initial wettability. The present invention also relates to a surface protective film using such a polyurethane-based pressure-sensitive adhesive. The surface protective film of the present invention comprises a base material layer and a pressure-sensitive adhesive layer, and is preferably used, for example, in an app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J7/02C09J7/38
CPCC08G18/4829C08G18/5021C08G18/792C08G18/794C08G18/222C08G18/4816C08G18/482C08G2170/40C09J7/38Y10T428/2896Y10T428/2848C09J175/04C09J7/22G02B5/003G02B5/005C09J2301/302C09J2203/00B32B7/12
Inventor 佐佐木翔悟伊关亮徐创矢内田翔泽崎良平安藤雅彦
Owner NITTO DENKO CORP
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