Patent ID: 7915340
Filing Date: 2011-03-29
Classification: C08F,D21H

Abstract:
1. A process for the preparation of a cationic starch graft polymer, comprising: subjecting the following monomers a) to d) to free radical polymerization in the presence of component e), a) 20-80% by weight of acrylamide, methacrylamide or mixtures thereof, b) 3-20% by weight of at least one basic or cationic vinyl monomer, c) 0-1.5% by weight of at least one bifunctional or higher-functional, crosslinking agent, d) 0-10% by weight of at least one nonionic or anionic vinyl monomer which differs from the monomers mentioned under a) to c), e) 15-70% by weight of at least one starch or one starch derivative, wherein, in a first step, the component e), as the grafting base, is subjected to free radical polymerization in water with at least 30% by weight of the total amount of the component b) and then, in a second step, the other components a), c), d) and the remaining amount of b) are subjected to free radical polymerization in the presence of the reaction mixture formed in the first step, and the sum of a) to e) is 100% by weight.