National Starch and Chemical Investment Holding Corporation

Velayudhan N Kumar

Patrick G Jobe

Perincheery Aravindakshan

A process for preparing a modified polysaccharide graft copolymer complex which comprises the steps of:

Polysaccharide graft-polymers and the use in papermaking thereof

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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Bombay, India

Velayudhan N Kumar