Adhesive composition, adhesive sheet, and method for producing same
AssigneesToyo Ink Sc Holdings Co., Ltd., Toyochem Co., Ltd.
InventorsYoshitaka Tone, Toru Oya, Tetsuya Natsumoto, Hiroyuki Hayashi, Naoki Takeuchi, Yutaro Kato
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Abstract
An adhesive composition that exhibits excellent adhesive performance such as curved surface adhesiveness to low-polarity adherends and constant load peeling properties in high-temperature environments, and also an adhesive sheet and a method for producing the same.
Claims11
An adhesive composition comprising an acrylic polymer (A), a polyfunctional isocyanate compound (B) and a compound (C) having a steroid skeleton, wherein
- the acrylic polymer (A) is an acrylic polymer having a carboxyl group,
- an amount of the compound (C) having the steroid skeleton is from 0.1 to 20 parts by mass per 100 parts by mass of the acrylic polymer (A),
- the compound (C) having the steroid skeleton is any one of β-sitosterol, campesterol, stigmasterol, brassicasterol, lanosterol, ergosterol, β-cholestanol, coprostanol, epicholestanol or 7-dehydrocholesterol,
- a molar ratio between an isocyanate group in the polyfunctional isocyanate compound (B) and the combined total of a hydroxyl group and the carboxyl group in the acrylic polymer (A) and a hydroxyl group in the compound (C) having the steroid skeleton is from 0.05 to 1.5, and
- a glass transition temperature of the acrylic polymer (A) is within a range from −60 to 0° C.
A method for producing an adhesive sheet by forming an adhesive layer by coating and/or bonding on one surface of a surface skin material (D), wherein
- the adhesive layer comprises an adhesive composition comprising an acrylic polymer (A), a polyfunctional isocyanate compound (B) and a compound (C) having a steroid skeleton,
- the acrylic polymer (A) is an acrylic polymer having a carboxyl group,
- an amount of the compound (C) having the steroid skeleton is from 0.1 to 20 parts by mass per 100 parts by mass of the acrylic polymer (A),
- the compound (C) having the steroid skeleton is any one of β-sitosterol, campesterol, stigmasterol, brassicasterol, lanosterol, ergosterol, β-cholestanol, coprostanol, epicholestanol or 7-dehydrocholesterol,
- a molar ratio between an isocyanate group in the polyfunctional isocyanate compound (B) and the combined total of a hydroxyl group and the carboxyl group in the acrylic polymer (A) and a hydroxyl group in the compound (C) having the steroid skeleton is from 0.05 to 1.5, and
- a glass transition temperature of the acrylic polymer (A) is within a range from −60 to 0° C.
Dependencies are inferred from the claim text.