Paper containing cationic starch graft copolymers from starch, N

Details Paper containing cationic starch graft copolymers from starch, N Paper containing cationic starch graft copolymers from starch, N

1981-02-02

1982-05-18

Smith, William F.

Paper making and fiber liberation

Processes and products

Non-fiber additive

162175, D21H 328

Patent

active

043303650

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. The starch-g-coplymers are used in amounts of from about 0.05 to 2.0% by weight, based on the dry pulp. The reaction mixture itself may be added directly to the paper stock.

REFERENCES:
patent: 2759913 (1956-08-01), Hulse
patent: 2867607 (1959-01-01), Jen
patent: 2977245 (1961-03-01), Jen
patent: 3035045 (1962-05-01), Trimmel
patent: 3785921 (1974-01-01), Ide et al.
patent: 3962159 (1976-06-01), Ray-Chaudheri
patent: 4060507 (1977-11-01), Floyd et al.
patent: 4066495 (1978-01-01), Voight et al.
Chem. Abstracts, 81:54098.

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