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Dan Van Calcar

Bernard W Wolff

Verson E Pandian

Vernon E Pandian

An aqueous surface sizing composition for sizing paper or paperboard having as essential components 50 to 70 pads of a water soluble or water dispersible hydroxylated polymer, an amount of a carboxylated polymer that is present relative to hydroxylated polymer in a ratio of 0.5:99.5 to 4:96 and not exceeding 7 pads carboxylated polymer, 0.3 to 3.0 pads of an alkali salt of a Group IV metal (e.g., zirconium, hafnium, and titanium), and sufficient water to obtain 1.5 to 2.0 percent total solids. The sizing compositions may further include polymeric additives, aqueous alkali, a pigment and a defoamer.

Use of zirconium salts to improve the surface sizing efficiency in paper

This invention relates to an improved process of surface sizing of paper and paperboard. The process consists of:

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Salem, OR, United States of America

Dan Van Calcar