Patent ID: 6518342
Filing Date: 2003-02-11
Classification: C08L,C09J

Abstract:
An emulsion for a pressure-sensitive adhesive comprising as essential components:a pressure-sensitive adhesive polymer (A) having a glass-transition temperature of âˆ’80 to âˆ’20Â° C., a weight-average molecular weight of 150,000 or larger, and a carboxylic acid value of 30 or smaller; a rosin derivative (B) having carboxyl groups and having a weight-average molecular weight of 100,000 or smaller, and containing at least part of the carboxyl groups in alkali form with a carboxylic acid value of 190 or larger before alkalization; and a compound (C) having a weight-average molecular weight of 100,000 or smaller, and having no carboxyl group but having at least one functional group reactive with a carboxyl group in its molecule, wherein the amount of the rosin derivative (B) is 2 to 30 mass percent when the total amount of the pressure-sensitive adhesive polymer (A) and the rosin derivative (B) in the emulsion is defined as 100 mass percent, and wherein the compound (C) is contained in the emulsion so that the functional group of the compound (C) is in an amount of 0.05 to 10 equivalent with respect to one equivalent of the carboxyl groups of the rosin derivative (B) before alkalization.