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Adhesive sheet for protection of coating film

A technology of adhesive sheet and coating film, which is applied in the direction of film/sheet-like adhesives, adhesives, synthetic resin layered products, etc., to achieve the effect of excellent softness

Inactive Publication Date: 2014-11-26
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] That is, there is no adhesive sheet for coating film protection that has flexibility as a film, especially flexibility against the uneven surface and curved surface of the vinyl chloride sol-coated part, and is urgently desired.

Method used

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  • Adhesive sheet for protection of coating film
  • Adhesive sheet for protection of coating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] "Preparation of Coating Liquid for Composite Films"

[0108] In a reaction vessel equipped with a cooling tube, a thermometer and a stirring device, 5 parts of acrylic acid (AA), 35.5 parts of isobornyl acrylate (IBXA), 9.5 parts of n-butyl acrylate (BA), and 36.4 parts of polyoxytetramethylene glycol (PTMG) (number average molecular weight 650, manufactured by Mitsubishi Chemical Co., Ltd.) as a polyol was added dropwise with 13.6 parts of hydrogenated xylylene diisocyanate (HXDI), React at 65°C for 10 hours. Thereafter, 2 parts of 4-hydroxybutyl acrylate were added dropwise, followed by reaction at 65° C. for 1 hour to obtain a polyurethane polymer-acrylic monomer mixture.

[0109] Thereafter, 3 parts of trimethylolpropane triacrylate as a crosslinking agent, 0.15 parts of bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (Ciba Japan "IRGACURE 819" manufactured by K.K.), as an ultraviolet absorber, 1.25 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl )-5...

Embodiment 2

[0125] A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the coating liquid for composite film was changed to the one shown below.

[0126] "Preparation of Coating Liquid for Composite Films"

[0127] In a reaction vessel equipped with a cooling tube, a thermometer and a stirring device, put 8.8 parts of acrylic acid (AA) and 31.2 parts of isobornyl acrylate (IBXA) as an acrylic monomer, and 43.7 parts of polyoxytetraethylene as a polyol. Methyl glycol (PTMG) (number average molecular weight 650, manufactured by Mitsubishi Chemical Co., Ltd.) and 16.3 parts of hydrogenated xylylene diisocyanate (HXDI) were added dropwise while stirring, and reacted at 65° C. for 10 hours. Thereafter, 2 parts by weight of 2-hydroxyethyl acrylate was added dropwise, followed by reaction at 65° C. for 1 hour to obtain a polyurethane polymer-acrylic monomer mixture.

[0128] Thereafter, 0.12 parts of bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (...

Embodiment 3

[0131] A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the coating liquid for composite film was changed to the one shown below.

[0132] "Preparation of Coating Liquid for Composite Films"

[0133] In a reaction vessel equipped with a cooling tube, a thermometer and a stirring device, 6.5 parts of acrylic acid (AA), 28.3 parts of isobornyl acrylate (IBXA) and 8.7 parts of n-butyl acrylate (BA) were put in as acrylic monomers, and 32.5 parts of polyoxytetramethylene glycol (PTMG) (number average molecular weight 650, manufactured by Mitsubishi Chemical Co., Ltd.) and 1.5 parts of 1,4-butanediol were added dropwise while stirring 22.5 parts of hydrogenated benzene Dimethyl diisocyanate (HXDI), reacted at 65°C for 10 hours. Thereafter, 2.7 parts of 2-hydroxyethyl acrylate was added dropwise, followed by reaction at 65° C. for 1 hour to obtain a polyurethane polymer-acrylic monomer mixture.

[0134] Thereafter, 0.13 parts of bis(2...

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Abstract

[Problem] To provide an adhesive sheet for protecting coating films having excellent flexibility. [Means for solving] The adhesive sheet for protecting coating films comprises an adhesive layer and a base layer provided with a composite film containing at least a urethane polymer, and the adhesive sheet has a 10% modulus at 20°C of 35 N / cm or less, and a 100% modulus at 20°C of 8 N / cm or more. A breaking strength of the adhesive sheet for protecting coating films is preferably 40 N / cm or more.

Description

technical field [0001] The present invention relates to a pressure-sensitive adhesive sheet for coating film protection including a base material having a composite film containing at least a polyurethane polymer, and particularly relates to a pressure-sensitive adhesive sheet for coating film protection having good flexibility. Background technique [0002] Composite films of acrylic polymers and polyurethane polymers are described in, for example, JP-A-2003-96140, JP-A-2003-171411, JP-A-2004 as films capable of both high strength and high elongation at break. - Publication No. 10662 etc. This composite film has tough physical properties such as high strength and high elongation at break as a film, but when used as a base material for an adhesive sheet for protecting a painted surface such as an automobile paint film, for example, it has a softness as a film. Insufficient performance (especially softness to uneven surfaces and curved surfaces of vinyl chloride sol-coated p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/02B32B27/00C09J7/29
CPCC09J2433/006C09J2201/162C09J2475/006C09J7/0296C09J7/0264C09J7/22C09J7/29Y10T428/28Y10T428/14Y10T428/1452C09J2301/162
Inventor 上杉正纪白井光义甲斐诚铃木秀典井本荣一
Owner NITTO DENKO CORP
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