Process for manufacture of paper
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United States of America Patent
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Mar 15, 1994
Grant Date -
N/A
app pub date -
May 28, 1992
filing date -
May 30, 1991
priority date (Note) -
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Abstract
A process for the manufacture of paper from pulp employs at least one graft copolymer of starch selected from the group consisting of starch graft-polymethacrylic acid, starch graft-polyacrylic acid, cationic starch graft-polymethacrylic acid and cationic starch graft-polyacrylic acid as a wet-end additive. The graft copolymer preferably has an add on amount of acid of from about 0.1 to about 50% based on the weight of the starch, and is typically added to cellulosic pulp in an amount of from about 0.1 to about 10% based on the weight of the pulp. Such wet-end additives are also useful in processes involving relatively high alum levels of up to about 15 or 25%, based on the weight of the pulp.
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