Method for preparing acrylic acid-based adhesive and adhesive film manufactured thereby

An acrylic and adhesive technology, applied in the direction of film/sheet adhesive, adhesive type, ester copolymer adhesive, etc., can solve the problems of insufficient initial adhesive strength, yellowing, solvent residue, etc.

Active Publication Date: 2019-10-01
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the acrylic resin prepared by the existing polymerization method has a weight average molecular weight of hundreds of thousands to millions, which is relatively high, and insufficient initial adhesive strength, when the acrylic resin is applied to There is a problem with the adhesive
[0004] Therefore, in order to prepare low-molecular-weight acrylic resins, a bulk photopolymerization method that does not include a separate solvent is used, but this method has a problem in that it is difficult to control heat generation caused by the polymerization reaction.
However, even in this case, the solvent used remains, the adhesive properties of the low-molecular-weight acrylic resin deteriorate due to the chain transfer agent added for polymerization, and phenomena such as yellowing occur, making it difficult to convert the low-molecular-weight acrylic resin to Acrylic Resins for Optically Clear Adhesives
[0006] Besides, when an adhesive film is prepared by curing an adhesive containing an acrylic resin, there is a problem of deterioration in durability
Furthermore, when attaching an adhesive film to a member having a printing step, there is a problem that, without a separate curing agent, the printing step cannot be buried sufficiently by additional curing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0024] According to an exemplary embodiment of the present invention, the (meth)acrylate monomer may comprise at least one of the following: an alkyl-containing (meth)acrylate monomer, a cycloalkyl-containing (methyl) ) acrylate monomers and (meth)acrylate monomers containing polar functional groups.

[0025] In the present specification, the alkyl group may include a carbon chain structure in which an unsaturated bond does not exist in a functional group, and specifically, may include a straight or branched carbon chain structure having 1 to 20 carbon atoms.

[0026] According to an exemplary embodiment of the present invention, the alkyl-containing (meth)acrylate monomer may be one or more monomers selected from the group consisting of methacrylate, methyl (meth)acrylate , Ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, tert-butyl (meth)acrylate, (meth)acrylic acid sec-butyl, pentyl (meth)acrylate, 2-ethylhexyl (meth)acrylate...

Embodiment 1

[0073] Based on a total of 100 parts by weight of 50 parts by weight of ethylhexyl acrylate (2-EHA), 30 parts by weight of isobornyl acrylate (IBOA) and 20 parts by weight of hydroxyethyl acrylate (HEA), a preparation containing 2 parts by weight benzophenone methacrylate (BPMA), 0.05 parts by weight of photopolymerization initiator (Irgacure 184, CIBA), 1.2 parts by weight of chain transfer agent (isooctyl thioglycolate) and 20 parts by weight of solvent (acetic acid ethyl esters) mixture.

[0074] The mixture was subjected to solution photopolymerization by irradiating the mixture with a metal halide lamp at a temperature of 25° C. for about 3 hours, thereby preparing a solution containing a low molecular weight acrylic resin. In this case, the low molecular weight acrylic resin was obtained at a conversion rate of about 95%.

[0075] After mixing the solution containing the low-molecular-weight acrylic resin with the monomer for dilution (isobornyl acrylate; IBOA), the press...

Embodiment 2

[0077] An acrylic adhesive was prepared in the same manner as in Example 1, except that, based on a total of 100 parts by weight of ethylhexyl acrylate (2-EHA), isobornyl acrylate (IBOA) and hydroxyethyl acrylate (HEA), the content of BPMA was adjusted to 1 part by weight. In this case, the low molecular weight acrylic resin was obtained at a conversion rate of about 95%.

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PUM

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Abstract

The present invention relates to a method for preparing an acrylic acid-based adhesive capable of improving durability of an adhesive film through additional photo-curing and efficiently removing residual components due to solution photo-polymerization, and to an adhesive film manufactured thereby.

Description

technical field [0001] This specification claims priority and benefit from Korean Patent Application No. 10-2017-0025367 filed with the Korean Intellectual Property Office on February 27, 2017, the entire contents of which are incorporated herein by reference. [0002] The present specification relates to a method of preparing an acrylic adhesive composition which can be additionally photocured and from which solvent, residual chain transfer agent and residual photopolymerization initiator are removed, and adhesive films prepared therefrom. Background technique [0003] In the field of optically clear adhesives, acrylic resins have been used to improve the adhesive strength of an adhesive film to an adherend and to secure transparency. However, since the acrylic resin prepared by the existing polymerization method has a weight average molecular weight of hundreds of thousands to millions, which is relatively high, and insufficient initial adhesive strength, when the acrylic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08C09J133/10C09J4/00C09J7/30
CPCC09J4/00C09J7/00C08F2/48C08F2/38C08F220/1808C08F220/301C08F220/1811C08F220/20C08F220/281C09J133/08C09J133/10C08F2/06C08K5/37C09J4/06C08F220/303C09J2301/416C08F2/46C08F220/18C08F212/22C09J125/18C08F6/003C08F212/32
Inventor 崔埈满金相澴金章淳徐光洙崔源九安致官
Owner LG CHEM LTD
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