Seiko Kagaku Kogyo Co., Ltd.

Kimihiko Goto

Shigehiko Yoshioka

Hideto Yamada

Yoshio Adachi

Kazuo Miyahana

An improved sizing is feasible by adding into a papermaking pulp slurry an aqueous dispersion prepared by mixing an aqueous solution of an ampholytic acrylamide polymer having both cationic and anionic groups with a liquid substituted succinic anhydride or with an anhydrous liquid mixture of a liquid substituted succinic anhydride and an oil-in-water type surfactant. Such a paper sizing process is very useful for making plasterboard base paper of multilayered structure composed of at least one surface layer having a high hot water resistance and at least one back layer having a good adhesiveness to plaster slush.

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hyogo, Japan

Kimihiko Goto