Patent ID: 6699363
Filing Date: 2004-03-02
Classification: C08B,C08L,D21H

Abstract:
A process comprising heating a composition, which comprises a starch, a polyacrylamide, and a multivalent cation to produce a modified-starch having an improved ash retention in paper furnish relative to a starch in the absence of a multivalent cation wherein said starch is selected from the group consisting of amphoteric starch and cationic starch; said polyacrylamide is selected from the group consisting of cationic polyacrylamide, anionic polyacrylamide, amphoteric polyacrylamide, and nonionic polyacrylamide; and the weight ratio of said starch to said polyacrylamide is greater than about 2 to 1 with the proviso that said heating is carried out at a pH above 7.0 when said cationic polyacrylamide or nonionic polyacrylamide is selected and neutralizes less than 75% of the charge of said cationic starch when said cationic starch and either said amphoteric polyacrylamide or said anionic polyacrylamide are selected.