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Removable water-dispersible acrylic-based adhesive composition and adhesive sheet

An acrylic, dispersion-type technology, applied in the direction of acidic copolymer adhesives, non-polymer adhesive additives, adhesive types, etc., can solve the difficult to meet the requirements of surface protection film improvement, and has not yet achieved re-peelability, etc. problem, to achieve the effect of excellent anti-whitening pollution, excellent anti-static performance, and low pollution

Inactive Publication Date: 2014-05-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, as mentioned above, the above-mentioned problems have not been solved in a balanced manner. In the technical field related to electronic equipment, where static electricity and contamination are particularly serious problems, it is currently difficult to meet the demand for further improvement of surface protection films having antistatic properties and the like. , no re-peelable water-dispersed acrylic adhesive has been obtained

Method used

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  • Removable water-dispersible acrylic-based adhesive composition and adhesive sheet
  • Removable water-dispersible acrylic-based adhesive composition and adhesive sheet
  • Removable water-dispersible acrylic-based adhesive composition and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0236] (Preparation of Acrylic Emulsion Polymer)

[0237] Mix 90 parts by weight of water, 96 parts by weight of 2-ethylhexyl acrylate (2EHA), 4 parts by weight of acrylic acid (AA) as shown in Table 1, and a reactive nonionic anionic emulsifier (Daiichi Kogyo Pharmaceutical Co., Ltd. Co., Ltd., trade name "Aquaron HS-1025") 3 parts by weight, and then stirred and mixed with a high-speed mixer to prepare a monomer emulsion.

[0238] Then, 50 parts by weight of water, 0.01 part by weight of a polymerization initiator (ammonium persulfate) and an amount corresponding to 10% by weight of the monomer emulsion were added to a reaction vessel with a condenser tube, a nitrogen gas introduction tube, a thermometer and a stirrer. , emulsion polymerization was carried out at 65° C. for 1 hour while stirring. Then, 0.05 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...

Embodiment 1-2～1-10

[0243]

[0244] As shown in Table 1, a monomer emulsion was prepared in the same manner as in Example 1-1, changing the raw material monomers and compounding amounts, and the like. In addition, additives not described in the table were prepared in the same compounding quantities as in Example 1-1. In addition, using the monomer emulsion, a re-peelable water-dispersed acrylic pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet were obtained in the same manner as in Example 1-1.

[0245] [evaluate]

[0246] The re-peelable 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.

[0247]

[0248] The prepared adhesive sheet was cut into a size of 70 mm in width and 130 mm in length, and after the separator was peeled off, i...

Embodiment 2-1

[0279] (Preparation of Acrylic Emulsion Polymer)

[0280] Mix 90 parts by weight of water, 92 parts by weight of 2-ethylhexyl acrylate (2EHA) as shown in Table 2, 4 parts by weight of acrylic acid (AA), and 4 parts by weight of methyl methacrylate (MMA) in the container. 3 parts by weight of a nonionic anionic emulsifier (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd., trade name "Aquaron HS-1025"), and then stirred and mixed with a high-speed mixer to prepare a monomer emulsion.

[0281] Then, 50 parts by weight of water, 0.01 part by weight of a polymerization initiator (ammonium persulfate) and an amount corresponding to 10% by weight of the monomer emulsion were added to a reaction vessel with a condenser tube, a nitrogen gas introduction tube, a thermometer and a stirrer. , emulsion polymerization was carried out at 65° C. for 1 hour while stirring. Then, 0.05 parts by weight of a polymerization initiator (ammonium persulfate) was further added, and the remaining...

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Abstract

Provided is a water-dispersible acrylic-based adhesive composition which offers excellent antistatic properties (anti-peeling-static properties), removability, adhesion (adhesiveness), and performance in preventing an elevation in peel force (cohesion) over time, and which is able to form an adhesive layer offering excellent low-contamination properties for an adherend, in particular excellent prevention of whitening contamination occurring on an adherend in a high-humidity environment (whitening contamination prevention properties). Also provided is an adhesive sheet having an adhesive layer made using the adhesive composition. This removable water-dispersible acrylic-based adhesive composition is characterized in containing: an acrylic emulsion polymer, containing at least an alkyl (meth)acrylate ester (A) and a carboxyl group-containing unsaturated monomer (B) at 0.5 to 10 wt%, as raw material monomers; and an alkylene oxide group-containing polysiloxane.

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. Specifically, the present invention relates to an adhesive capable of forming antistatic properties, re-peelability, adhesiveness (adhesiveness), anti-peeling force (adhesive force) increase over time, and low contamination to an adherend. A water-dispersible acrylic pressure-sensitive adhesive composition for re-peeling of a mixture layer. In addition, the present invention relates to a PSA sheet provided with a PSA layer comprising the PSA composition. Background technique [0002] In the manufacturing and processing of optical members (optical materials) such as polarizing plates, retardation plates, and anti-reflection films, for the purpose of preventing surface scratches and stains, improving cutting processability, and suppressing cracks, etc., A surface protection film is past...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J7/02C09J11/06C09J183/12C09J7/38C09J7/22
CPCC08G77/46C09J133/02C09J133/08C09J2203/318C09J2433/00C09J2483/00G02F2202/28C09J7/38C09J7/22Y10T428/2891Y10T428/31663C09J2301/414C08F220/1808C08F220/06C08F220/14B32B27/30C09J11/02C09J11/06C09J133/06
Inventor 米崎幸介天野立巳森本有三井数马高岛杏子
Owner NITTO DENKO CORP
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