Retention and drainage aid for papermaking

D - Textiles – Paper – 21 – H

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9/42, 9/59

D21H 21/10 (2006.01) D21H 17/66 (2006.01) D21H 17/28 (2006.01) D21H 17/32 (2006.01) D21H 17/37 (2006.01)

Patent

CA 1324703

TITLE RETENTION AND DRAINAGE AID FOR PAPERMAKING ABSTRACT An improvement in a papermaking process in which an aqueous paper furnish containing cellulosic pulp, and optionally also mineral fillers is formed and dried, the improvement being the addition of a drainage and retention aid comprising a water soluble alkali metal polyaluminosilicate microgels formed from the reaction of polysilicic acid and an alkali metal aluminate, the polyaluminosilicate having an alumina/silica mole ratio greater than about 1/100, together with a cationic polymer selected from the group consisting of cationic starch, cationic guar and cationic polyacrylamide.

588153

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