Nippon Shokubai Co., Ltd.

Naoki Tsunemine

Yasumasa Tanaka

Osamu Konosu

Akikazu Banba

The present invention provides an emulsion for pressure-sensitive adhesive, and a pressure-sensitive adhesive product which exhibits high water resistance and high adhesion properties. The emulsion for pressure-sensitive adhesive includes as essential components: a pressure-sensitive adhesive polymer (A) having a glass-transition temperature of &minus;80 to &minus;20&deg; 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 a weight-average molecular weight of 100,000 or smaller, and containing at least part of the carboxyl groups being alkali salt 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. 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 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.

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Suita, Japan

Naoki Tsunemine