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Acrylic adhesive composition, acrylic adhesive sheet, and method for bonding the adhesive sheet to coated surface of automobile

An acrylic, composition technology, applied in the direction of bonding method, adhesive type, ester copolymer adhesive, etc., can solve the problems of reduced adhesive force, reduced adhesiveness, and unobtainable adhesive sheets.

Inactive Publication Date: 2010-02-17
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with conventional paints made of acrylic-melamine cross-linked products, the above-mentioned surfaces made of acid rain-resistant paints tend to have reduced adhesion
In addition, due to the presence of low surface tension substances such as silicone on the surface of the coating film, the wettability of the silicone-based surface conditioner and the adhesive sheet decreases, and the adhesive force decreases. This tendency is particularly pronounced when a large amount of surface conditioner is added.
[0005] That is, the current situation is that an adhesive sheet that can exhibit sufficient adhesion to the recent new acid rain-resistant automotive coatings has not yet been obtained.

Method used

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  • Acrylic adhesive composition, acrylic adhesive sheet, and method for bonding the adhesive sheet to coated surface of automobile
  • Acrylic adhesive composition, acrylic adhesive sheet, and method for bonding the adhesive sheet to coated surface of automobile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167](Synthesis of Copolymerized Oligomer (B1))

[0168] 148.5 parts by weight of cyclohexyl methacrylate, 1.5 parts by weight of single-end modified silicone oil ("X-22-2426" produced by Shin-Etsu Silicone Co., Ltd.), 4.5 parts by weight of 2-mercapto Ethanol, 0.3 parts by weight of 2,2'-azobisisobutyronitrile (AIBN), and 154.5 parts by weight of toluene were put into the flask. Polymerization was carried out at 70°C for 2 hours, followed by further aging at 80°C for 1 hour. Thereafter, toluene was distilled off from the reaction liquid, and it was further dried with a reduced-pressure drier to obtain a copolymerized oligomer (B1).

[0169] According to GPC (gel permeation chromatography), the copolymerized oligomer (B 1) had a polystyrene-equivalent weight-average molecular weight (the same applies hereinafter) of 4000, and a Tg (theoretical value) of 64°C.

[0170] (Preparation of Alkyl (Meth)acrylate Partial Polymer (A1) (UV Paste))

[0171] 0.05 parts by weight of tra...

Embodiment 2

[0184] Except that the acrylic adhesive composition was prepared by adding 10 parts by weight of the copolymerized oligomer (B1), the PET film-based acrylic adhesive sheet (I-d) and the acrylic foam-based adhesive sheet were obtained in the same manner as in Example 1. material acrylic adhesive sheet (II-d).

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Abstract

Disclosed is an acrylic adhesive composition which enables to form an adhesive layer exhibiting excellent adhesion to a coating film, which is likely to cause adhesion failure due to bleeding of a surface modifying agent or the like, without requiring a cleaning process or the like. Specifically disclosed is an acrylic adhesive composition characterized by containing (a) a vinyl monomer mainly composed of a (meth)acrylic acid alkyl ester monomer (a1) having an alkyl group with 2-14 carbon atoms or a partially polymerized product thereof, and (b) a (meth)acrylic acid ester copolymerized oligomer having a weight average molecular weight of 1,000-30,000, which contains, as monomer components, 96-99.5% by weight of a (meth)acrylic acid alkyl ester (b1) and 0.1-4% by weight of a silicone oil (b2) having a (meth)acryloyl group.

Description

technical field [0001] This invention relates to acrylic adhesive compositions. More specifically, it relates to an active energy ray-curable adhesive composition used as an adhesive layer or the like of an adhesive sheet for bonding a painted surface of an automobile. In addition, the present invention relates to an acrylic adhesive sheet using the adhesive composition and a method of adhering the adhesive sheet to a painted surface of an automobile. Background technique [0002] In the past, for the exterior decoration of automobiles, the protection and decoration of the vehicle body, adhesive tapes or adhesive sheets based on foams were used (hereinafter, "adhesive tapes or adhesive sheets" are simply collectively referred to as "adhesive sheets"). ”) to paste trim, boards, etc. As such an adhesive sheet to be bonded to a coating film for an automobile, for example, a foam for a foam that is excellent in adhesive strength and shear force by dispersing glass microbubbles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J4/02B29C65/50B32B27/00C09J5/00C09J7/02C09J11/06
CPCC09J133/08C08L2312/06C08L83/04C09J2205/106C08K7/22C09J7/0217C09J2205/11C09J7/385C08L83/00Y10T428/2878C09J2301/41C09J2301/412
Inventor 冈本昌之白井光义上杉正纪近藤隆丹羽理仁井口伸儿
Owner NITTO DENKO CORP
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