Patent ID: 8980056
Filing Date: 2015-03-17
Classification: D21H

Abstract:
1. A dry strength additive composition comprising: an anionic and/or amphoteric polyacrylamide having a molecular weight of less than 500,000 Daltons, wherein the amphoteric polyacrylamide has a net negative charge; a cationic and/or amphoteric starch; and a cationic non-starch polymer, wherein the composition has an overall net positive charge, wherein the cationic non-starch polymer is selected from the group consisting of: a dimethylamine-epichlorohydrin polymer, a dimethyldiallylammonium chloride homopolymer or copolymer, a polymeric quaternary ammonium compound, and a combination thereof; and wherein the anionic and/or amphoteric polyacrylamide to the cationic starch is at a weight ratio range from 5:1 to 1:2.