Preparation of cationic starch graft copolymers from starch, N,N

Details Preparation of cationic starch graft copolymers from starch, N,N Preparation of cationic starch graft copolymers from starch, N,N

1980-04-07

1981-07-14

Woodberry, Edward M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

162168NA, 162175, C08L 302

Patent

active

042785731

ABSTRACT:
Novel cationic starch-g-poly(N,N'-methylenebisacrylamide-co-amine) copolymers, useful as pigment retention aids for paper, are prepared by reacting a starch base with N,N'-methylenebisacrylamide and a polyamine or with preformed copolymer. The reactions are carried out at 15.degree. to 80.degree. C. for 0.5 to 20 hours under alkaline conditions using an aqueous slurry or dispersion of a starch base and preferably a salt such as sodium sulfate. The starch base may be derivatized, prior to the graft copolymerization, to introduce ether groups. The polyamines contain at least two amine groups selected from primary and secondary amines; preferably they contain up to 4 amine nitrogens, some of which may be unreactive tertiary amine nitrogens.

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Chem. Abstr. 81: 54098, "Water-Soluble Polycationic Coagulant for Purification of Waste Water," Fujimura et al.

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