Pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet thereof
AssigneeNitto Denko Corporation
InventorsTatsumi Amano, Masahiko Ando, Waka Sakaitani
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Abstract
A pressure-sensitive adhesive composition is described, which comprises a polyester having an improved molecular structure and can find wide applications, which polyester has both a good mechanical strength and a good flexibility, is obtained from starting material components essentially comprising an aliphatic diol having a carbonate structure in the main chain thereof, and at least one of a polyhydric alcohol having three or more hydroxyl groups and a polycarboxylic acid having three or more carboxyl groups, and has a number average molecular weight of 5,000 or more and a degree of dispersion of 2.2 or more.
Claims4
A pressure-sensitive adhesive composition which comprises a polyester obtained from starting material components comprising:
- (A) an aliphatic diol having in the main chain a structural unit represented by the following formula (1):
- wherein R represents a straight or branched hydrocarbon group having 2 to 20 carbon atoms;
- and
- (B) at least one component selected from the group consisting of (i) a polyhydric alcohol having three or more hydroxyl groups, and (ii) a polycarboxylic acid having three or more carboxyl groups;
- said polyester having a number average molecular weight of 5,000 or more, a degree of dispersion of 2.2 or more, and a storage elastic modulus at 23° C. of 1.5×105 Pa or less.
Dependencies are inferred from the claim text.