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Removable water-dispersible acrylic pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet

An acrylic, dispersed technology, applied in the direction of polymer adhesive additives, non-polymer adhesive additives, adhesive types, etc., can solve the problems of adverse effects on optical properties of optical components, pollution, seepage, etc. Achieves excellent re-peelability, excellent low-contamination properties, and prevents the effect of rising over time

Active Publication Date: 2012-10-17
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, silicone-based antifoaming agents have problems in that they are poor in uniform dispersibility in the adhesive composition, and locally form highly hydrophobic portions, which become starting points and cause shrinkage when the adhesive composition is applied. Deformation (crawling)
In addition, there is also a problem that the compatibility between the silicone-based antifoaming agent and the acrylic emulsion polymer is poor, and after the adhesive layer is formed, it bleeds to the surface of the adhesive layer, causing contamination of the adherend.
Especially in the application of surface protection films for optical components, contamination may affect optical characteristics, so it becomes a serious problem
[0012] On the other hand, there is a problem that although the antifoaming agent containing hydrophobic silica has excellent uniform dispersibility in the adhesive composition, the hydrophobic silica contained in it forms secondary aggregates, and the Defects in silica particles
At this time, there is also a problem that silica particles clog the filter and reduce production efficiency.
[0013] In addition, in surface protection film applications (especially surface protection film applications for optical members), the adhesive remains on the surface of the adherend (optical member, etc.) when the adhesive sheet is peeled off (so-called "adhesive residue"), Contamination of the surface of the adherend caused by the transfer of components contained in the adhesive layer to the surface of the adherend, etc., causing adverse effects on the optical characteristics of the optical member, etc.

Method used

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  • Removable water-dispersible acrylic pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet
  • Removable water-dispersible acrylic pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet
  • Removable water-dispersible acrylic pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] Preparation of Acrylic Emulsion Polymer (A)

[0189] Mix 90 parts by weight of water, and 96 parts by weight of 2-ethylhexyl acrylate (2EHA) shown in Table 1, 4 parts by weight of acrylic acid (AA), 3 parts by weight of nonionic anionic reactive emulsifier (ADEKA) in the container CORPORATION, trade name "ADEKA REASOAP SE-10N"), and then stirred and mixed by a homomixer to prepare a monomer emulsion.

[0190] Next, 50 parts by weight of water, 0.01 part by weight of a polymerization initiator (ammonium persulfate), and 10% by weight of the monomer emulsion prepared above were added to a reaction vessel equipped with a cooling pipe, a nitrogen gas introduction pipe, a thermometer, and a stirrer. The amount was emulsion polymerized at 75°C for 1 hour while stirring. Then, 0.05 parts by weight of a polymerization initiator (ammonium persulfate) was further added, and then the remaining whole monomer emulsion (corresponding to 90% by weight) was added over 3 hours while ...

Embodiment 2、3、5～8

[0195] Embodiment 2, 3, 5~8, comparative example 1~6

[0196] In the same manner as in Example 1, a re-peelable water-dispersed acrylic pressure-sensitive adhesive composition was prepared using the formulation shown in Table 1 to obtain a pressure-sensitive adhesive sheet.

Embodiment 4

[0198] As shown in Table 1, a monomer emulsion was prepared in the same manner as in Example 1, changing the type and compounding amount of the raw material monomers.

[0199] Except having used the said monomer emulsion, it carried out similarly to Example 1, and obtained the re-peelable water dispersion-type acrylic-type adhesive composition and the adhesive sheet.

[0200] Evaluation

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Abstract

A removable water-dispersible acrylic pressure-sensitive adhesive composition according to the present invention includes an acrylic emulsion polymer (A) including, as essential constitutive monomers, a (meth)acrylic alkyl ester in a content of 70 to 99.5 percent by weight, and a carboxyl-containing unsaturated monomer in a content of 0.5 to 10 percent by weight, each based on the total amount of constitutive monomers; a waterw-insoluble crosslinking agent (B); an acetylenic diol compound (C); and a compound (D) represented by chemical formula CR a O-(PO) l -(EO) m -(PO) n -R b ]. The acetylenic diol compound (C) has a HLB value of less than 13.

Description

technical field [0001] The present invention relates to a repeelable water-dispersible acrylic adhesive composition. More specifically, the present invention relates to a re-peelable water-dispersed acrylic adhesive capable of reducing appearance defects such as dents, having excellent appearance characteristics, and excellent performance in preventing adhesive strength from increasing over time. combination. Moreover, this invention relates to the PSA sheet provided with the PSA layer formed from this PSA composition. Background technique [0002] In the manufacturing and processing of optical members (optical materials) represented by optical films such as polarizing plates, retardation plates, and anti-reflective plates, in order to prevent surface damage, contamination, improve cutting processability, and suppress cracks, etc., in optical members A surface protection film is attached to the surface (see Patent Documents 1 and 2). As these surface protection films, gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/06C09J133/08C09J11/06C09J11/08C09J7/02
CPCC08F238/00C08F2/24C09J7/0207C09J133/00C09J7/00C09J7/0217C09J133/08C09J7/385Y10T428/2891C08F220/1808C08F220/06C09J7/22C09J7/40C09J133/04C09J2203/318C09J2301/302
Inventor 天野立巳森本有三井数马高岛杏子
Owner NITTO DENKO CORP
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