Method of making graft copolymers

Details Method of making graft copolymers Method of making graft copolymers

1989-08-25

1991-12-24

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From protein or biologically active polypeptide reactant

527202, 527207, 527300, 527311, 527312, 527313, 527314, 527315, 525 59, 525246, C08H 100, C08H 502

Patent

active

050754017

ABSTRACT:
A graft copolymer is made by grafting, by a free radical reaction mechanism in aqueous solution, water soluble ethylenically unsaturated monomeric material on to a water soluble substrate having hydroxyl groups, and the free radicals are formed on the substrate using an oxidizing metal capable of being reduced by the substrate to a lower valency state (for instance cerium) and persulphate or other peroxy compound capable of oxidizing the metal back to a higher valency state. The process is preferably conducted as a reverse phase polymerization process and the invention includes also a novel reverse phase emulsion comprising a dispersion of reverse phase polymer particles of a graft copolymer of carboxymethyl cellulose, dextran or starch with acrylamide and acrylic acid and/or AMPS.

REFERENCES:
patent: 4131576 (1978-12-01), Iovine et al.
Bains "Inorganic Redox Systems in Graft Polymerization Onto Cellulosic Materials", J. Polymer Sci.: Part C, No. 37, pp. 125-151 (1972).

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