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Re-peelable aqueous dispersion-type acrylic adhesive composition and adhesive sheet

An acrylic, dispersion-type technology, applied in the direction of polymer adhesive additives, non-polymer adhesive additives, adhesive types, etc. problem, to achieve the effect of excellent anti-whitening pollution, reduced sag, and low pollution

Inactive Publication Date: 2014-07-16
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 become particularly serious problems, it is difficult to deal with antistatic products. The requirements for further improvement of the surface protection film of etc. have not yet obtained a water-dispersed acrylic adhesive with removability

Method used

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  • Re-peelable aqueous dispersion-type acrylic adhesive composition and adhesive sheet
  • Re-peelable aqueous dispersion-type acrylic adhesive composition and adhesive sheet
  • Re-peelable aqueous dispersion-type acrylic adhesive composition and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0277] (Preparation of Acrylic Emulsion Polymer)

[0278] 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.

[0279] 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 1-2～1-7、 comparative example 1-1～1-3

[0285] 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. 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.

[0286] [Evaluation]

[0287] 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 and Table 2.

[0288] (1) Stripping electrostatic voltage

[0289] 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, it was crimped to an acrylic resin plate (manufactured...

Embodiment 2-1

[0321] (Preparation of Acrylic Emulsion Polymer)

[0322] 90 parts by weight of water, 96 parts by weight of 2-ethylhexyl acrylate (2EHA), 4 parts by weight of acrylic acid (AA), 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.

[0323] 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) was added over 3 hours...

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Abstract

Provided is a re-peelable aqueous dispersion-type acrylic adhesive composition with which it is possible to form an adhesive layer that has excellent antistatic performance, adhesion properties, re-peelability, peeling stability, resistance to a rise in adhesive force, resistance to the formation of marks on an object to be adhered, particularly resistance to the formation of white marks (white mark resistance) on an object to be adhered under high-humidity conditions, and excellent appearance properties. This re-peelable aqueous dispersion-type acrylic adhesive composition is characterized by containing an acrylic emulsion polymer formed from 70 to 99.5 wt% of a (meth)acrylic acid alkyl ester and 0.5 to 10 wt% of a carboxyl group-containing unsaturated monomer as the monomer units; an ionic compound; and a polyether-type defoaming agent represented by the following formula (I). (I) HO-(PO)n1-(EO)m1-H [In formula (I), PO is an oxypropylene group, EO is an oxyethylene group, m1 is an integer between 0 and 40, n1 is an integer of at least 1, and the form of addition of EO or PO is random or block.]

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 appearance characteristics capable of forming antistatic properties, adhesive properties, re-peelability (light peeling properties), peeling stability, anti-adhesion increase over time, and reduction of dents and other appearance defects. Disclosed is a water-dispersed acrylic pressure-sensitive adhesive composition for re-peeling of a pressure-sensitive adhesive layer excellent in low sticky matter contamination. Moreover, this invention relates to the adhesive sheet provided with the adhesive layer containing the said adhesive 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 pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/00C09J7/02C09J11/06C09J133/06
CPCC09J133/06C08K3/16C08K5/0075C08K5/17C09J2203/318C09J2433/00C09J2471/00C08G2650/58C08K3/017C09J7/385C08L71/02Y10T428/2891Y10T428/31938C09J2301/408C09J11/06C09J133/00C09J11/08C09J133/08C09J133/12
Inventor 森本有天野立巳三井数马米崎幸介高岛杏子
Owner NITTO DENKO CORP
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