The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 1994
Filed:
May. 28, 1992
Velayudhan N Kumar, Bombay, IN;
Patrick G Jobe, West Fields, NJ (US);
National Starch and Chemical Investment Holding Corporation, Wilmington, DE (US);
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.