Adhesive composition and adhesive sheet
A composition and adhesive technology, applied in the direction of adhesive types, ester copolymer adhesives, polymer adhesive additives, etc., can solve the problems of increased electrostatic capacitance and malfunction of the touch panel, and achieve durability Excellent wet heat whitening property and low relative dielectric constant
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[0226] Hereinafter, the present invention will be further specifically described using examples. The present invention is not limited to the following examples unless the gist is exceeded.
[0227] [Manufacture of (meth)acrylic polymer]
[0228] [Manufacturing example 1]
[0229] 147 parts by mass of ethyl acetate and 0.05 parts by mass of 2,2'-azobis(2,4-dimethylvaleronitrile) were charged into a reaction container equipped with a thermometer, a stirrer, a reflux cooler, and a device for successively dropping.
[0230] On the other hand, in another container, 420 parts by mass of 2-ethylhexyl methacrylate (2EHMA, an alkyl methacrylate having a branched chain alkyl group having 8 carbon atoms) (with respect to all structural units) was prepared. 70% by mass), 120 parts by mass of 2-ethylhexyl acrylate (2EHA, an alkyl acrylate having a branched alkyl group having 8 carbon atoms) (20% by mass relative to all structural units), and methyl 600 parts by mass of a monomer mixture...
manufacture example 2～5
[0234] In manufacture example 1, except having changed monomer composition into the composition shown in Table 1, it carried out similarly to manufacture example 1, and manufactured (meth)acrylic-type polymer A-2 - A-5.
[0235] Table 1 shows the weight average molecular weight (Mw), degree of dispersion (Mw / Mn), and glass transition temperature (Tg) of the obtained (meth)acrylic polymers A-2 to A-5.
Embodiment 1
[0253] -Preparation of Adhesive Composition-
[0254] Styrenic polymer B-1 shown in Table 3 was dissolved in ethyl acetate to prepare an ethyl acetate solution (solid content: 50% by mass) of styrene polymer B-1. 2 parts by mass of the ethyl acetate solution of the styrene-based polymer B-1 was added to 100 parts by mass of the (meth)acrylic polymer A-1 as the solid content, and ethyl acetate was further added to obtain the solid content It diluted so that it might become 45 mass %, and obtained the polymer solution containing (meth)acrylic-type polymer A-1 and styrene-type polymer B-1.
[0255] The obtained polymer solution was mixed with a cross-linking agent (trade name: Takenate (registered trademark) D-110N, polyisocyanate compound, manufactured by Mitsui Chemicals Co., Ltd.) to prepare 100 parts by mass of (methyl) An adhesive composition comprising an acrylic polymer A-1, 1 part by mass of a styrene polymer B-1 as a solid content, and 0.2 parts by mass of a crosslinkin...
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Abstract
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