Adhesive agent composition, adhesive agent layer, and adhesive sheet
A technology of adhesive layer and composition, applied in the direction of adhesive type, ester copolymer adhesive, film/sheet adhesive, etc., can solve the problem of reducing the dielectric constant of the adhesive
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Embodiment 1
[0186]
[0187] 50 parts by weight of cyclohexyl acrylate (CHA), 50 parts by weight of 2-ethylhexyl acrylate (2EHA), 1 part by weight of 4-hydroxybutyl acrylate (HBA), and 2,2'- as a polymerization initiator 0.1 parts by weight of azobisisobutyronitrile and 200 parts by weight of ethyl acetate were added to a four-necked flask with a stirring blade, thermometer, nitrogen introduction tube and condenser, and nitrogen was introduced while stirring slowly for 1 hour of nitrogen replacement, and then The liquid temperature in the flask was maintained at about 55° C. and polymerization reaction was carried out for 10 hours to prepare a (meth)acrylic polymer solution with a weight average molecular weight of 900,000. The Tg of the obtained (meth)acrylic polymer was -35°C.
[0188] Then, in the (meth)acrylic polymer solution obtained above, 0.5 parts by weight of the trimethylolpropane adduct of xylylene diisocyanate (Mitsui) was blended with respect to 100 parts by weight of the solid ...
Embodiment 2~10、 comparative example 1~5
[0191] The types and composition ratios of the monomers used in the preparation of the (meth)acrylic polymer solution in Example 1 were changed as shown in Table 1, except that the same operations as in Example 1 were performed to produce Adhesive sheet. The weight average molecular weight and Tg of the obtained (meth)acrylic polymer are shown in Table 1.
[0192] The above-mentioned evaluation was performed on the pressure-sensitive adhesive sheets (samples) obtained in the above-mentioned Examples and Comparative Examples. The evaluation results are shown in Table 1.
[0193]
[0194] In Table 1, CHA represents cyclohexyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., homopolymer Tg=15°C);
[0195] 2EHA means 2-ethylhexyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., homopolymer Tg=-70℃);
[0196] i-NA represents isononyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., homopolymer Tg=-58℃);
[0197] HBA stands for 4-...
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