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AssigneeTeraoka Seisakusho Co., Ltd.
InventorsYasushi TSUCHIYA, Shoko OKAMURA
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An acrylic pressure-sensitive adhesive composition contains a pressure-sensitive adhesive composition including an acrylic copolymer (A) wherein a theoretical glass transition temperature (theoretical Tg, unit K) thereof is referred to as “a”, and a crosslinking agent (B) wherein a weight average molecular weight (×104) thereof is referred to as “b”, and wherein an amount of a monomer (AHTg) having a glass transition temperature (Tg′) of 273 K or higher and 437 K or lower included in a monomer component of the acrylic copolymer (A) (a percentage with respect to a mass of all monomer components, unit %) is referred to as “c”, wherein a pressure-sensitive adhesiveness index represented by an inverse of the cube root of the product of a·b·c is 1.5×10−2 or more and 2.0×10−2 or less.
A pressure-sensitive adhesive composition comprising:
The pressure-sensitive adhesive composition according to claim 4, wherein the monomer component of the acrylic copolymer (A) includes 50% by mass or more and 90% by mass or less of the alkyl (meth)acrylate ester (A1) including an alkyl group having 4 or more and 12 or less carbon atoms, 3% by mass or more and 10% by mass or less of the alkyl (meth)acrylate ester (A2) including an alkyl group having 1 or more and 3 or less carbon atoms, 1% by mass or more and 10% by mass or less of the carboxyl group-containing monomer (A3), and 0.1% by mass or more and 0.5% by mass or less of the hydroxyl group-containing monomer (A4) in 100% by mass of all monomer components.
The pressure-sensitive adhesive composition according to claim 5, wherein a total amount of the carboxyl group-containing monomer (A3) and the hydroxyl group-containing monomer (A4) is 10.5% by mass or less.
The pressure-sensitive adhesive composition according to claim 5, wherein the monomer component of the acrylic copolymer includes 10% by mass or less of a vinyl compound monomer (A5) other than the monomer components (A1) to (A4).
Dependencies are inferred from the claim text.