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Water-dispersible acrylic adhesive composition, adhesive layer, and adhesive sheet

An acrylic, dispersion-type technology, applied in the direction of non-polymer adhesive additives, acid copolymer adhesives, polyether adhesives, etc. Mixtures and other problems, to achieve the effects of excellent appearance characteristics, excellent anti-static properties, and excellent anti-whitening pollution properties

Active Publication Date: 2014-07-30
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, as mentioned above, in any of these prior arts, the above-mentioned problems cannot be solved in a balanced manner. In the technical field related to electronic equipment, where static electricity and pollution are particularly serious problems, it is difficult to deal with antistatic products. There is a need for further improvement of the surface protection film of etc., and a water-dispersed acrylic adhesive with excellent appearance characteristics and re-peelability has not yet been obtained

Method used

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  • Water-dispersible acrylic adhesive composition, adhesive layer, and adhesive sheet
  • Water-dispersible acrylic adhesive composition, adhesive layer, and adhesive sheet
  • Water-dispersible acrylic adhesive composition, adhesive layer, and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0304] (Preparation of Acrylic Emulsion Polymer)

[0305] Mix 90 parts by weight of water, 94 parts by weight of 2-ethylhexyl acrylate (2EHA), 2 parts by weight of methyl methacrylate (MMA) and 4 parts by weight of acrylic acid (AA) as shown in Table 1. 6 parts by weight of a nonionic anionic emulsifier (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd., trade name "Aquaron HS-10") was stirred and mixed with a high-speed mixer to prepare a monomer emulsion. Then, 50 parts by weight of water, 0.01 part by weight of a polymerization initiator (ammonium persulfate) and 10 wt. amount, emulsion polymerization was carried out at 75° C. for 1 hour while stirring. Then, 0.07 parts by weight of a polymerization initiator (ammonium persulfate) was further added, and the remaining whole monomer emulsion (an amount corresponding to 90% by weight) was added over 3 hours while stirring, and reacted at 75° C. for 3 hours. Then, it was cooled to 30° C., and the pH was adjusted to 8 by ...

Embodiment 1-2～1-8 and comparative example 1-1～1-6

[0311] As shown in Table 1 and Table 2, a monomer emulsion was prepared in the same manner as in Example 1-1, changing the types and compounding amounts of the raw material monomers and emulsifiers. Moreover, using the said monomer emulsion, it carried out similarly to Example 1-1, and obtained the water dispersion type acrylic adhesive composition and the adhesive sheet. In addition, Table 1 and Table 2 show the solvent-insoluble component content and the solvent-soluble component weight average molecular weight (Mw) of the acrylic emulsion polymer obtained in each Example and Comparative Example.

[0312] [Evaluation]

[0313] The water-dispersed acrylic pressure-sensitive adhesive compositions and pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples were evaluated by the following measurement methods or evaluation methods. In addition, the evaluation results are shown in Table 1 and Table 2.

[0314] (1) Elongation at break of crosslinked acryl...

Embodiment 2-1

[0371] (Preparation of Acrylic Emulsion Polymer)

[0372] Mix 90 parts by weight of water, 94 parts by weight of 2-ethylhexyl acrylate (2EHA), 2 parts by weight of methyl methacrylate (MMA) and 4 parts by weight of acrylic acid (AA) as shown in Table 3 in the container. 6 parts by weight of a nonionic anionic emulsifier (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd., trade name "Aquaron HS-10") was stirred and mixed with a high-speed mixer to prepare a monomer emulsion. Then, 50 parts by weight of water, 0.01 part by weight of a polymerization initiator (ammonium persulfate) and 10 wt. amount, emulsion polymerization was carried out at 75° C. for 1 hour while stirring. Then, 0.07 parts by weight of a polymerization initiator (ammonium persulfate) was further added, and the remaining whole monomer emulsion (an amount corresponding to 90% by weight) was added over 3 hours while stirring, and reacted at 75° C. for 3 hours. Then, it was cooled to 30° C., and the pH was ...

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Abstract

Provided is a water-dispersible acrylic adhesive composition capable of forming an adhesive layer, which, when peeled, can prevent the buildup of electrostatic charge in the object to which the film is adhered (antistatic properties), has outstanding removability and can prevent an increase in peel force (adhesive strength) over time, while at the same time having excellent appearance (reduced visual defects caused by recesses and the like) and less contamination with respect to the object to which the film is adhered, in particular the prevention of whitening in the object to which the film is adhered when subjected to high humidity conditions (prevention of whitening-causing contamination). This water-dispersible acrylic adhesive composition is characterized by containing: an ionic compound; and an acrylic emulsion polymer comprising, as monomer components, (i) (meth) acrylic acid alkyl ester, (ii) a carboxyl group-containing unsaturated monomer, and (iii) at least one monomer selected from a group consisting of methyl methacrylate, vinyl acetate and diethylacrylamide. The content of the (meth)acrylic acid alkyl ester (i) is 70-99.5wt.% with respect to the total quantity of monomer components.

Description

technical field [0001] The present invention relates to a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a re-peelable pressure-sensitive adhesive layer. More specifically, the present invention relates to an antistatic property, re-peelability, adhesive properties, reduction of appearance defects caused by dents, etc., particularly excellent appearance properties, low contamination of adherends, and time-dependent peeling force. (Adhesive force) A water-dispersed acrylic adhesive composition of an adhesive layer having excellent rising properties. Moreover, this invention relates to the adhesive sheet provided with the adhesive layer formed from the said adhesive composition. [0002] The present invention relates to water-dispersible acrylic adhesive compositions. Specifically, the present invention relates to a water-dispersed acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer excell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/00C09J7/02C09J11/04C09J133/04C09J171/00C09J183/12C09J7/22C09J7/38
CPCC09J133/08C08L2201/50C08G77/46C08K5/0075C09J2203/318C09J2433/00C09J133/02C09J133/26C08L2201/54C09J171/02C08G2650/58C09J7/38C09J7/22C08L33/02Y10T428/2891C09J2301/408C08F220/1808C08F220/06C08F220/14C08F218/08C08F220/54B32B27/30C09J11/02C09J11/06C09J133/06
Inventor 天野立巳森本有三井数马米崎幸介高岛杏子
Owner NITTO DENKO CORP
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