Graft polymerization process

Details Graft polymerization process Graft polymerization process

C - Chemistry, Metallurgy

08

F

C08F 291/00 (2006.01) C08F 257/02 (2006.01) C08F 265/02 (2006.01) C08F 265/10 (2006.01) C08F 291/18 (2006.01) C08F 293/00 (2006.01)

Patent

CA 2249955

Graft copolymers having side chains or branches of substantially uniform length and molecular weight are prepared by a process in which the backbone polymer is treated to create carbon centered free radicals thereon, e.g. by radiation, in the presence of a stable free radical compound. The free radical sites bond to the stable free radical through thermally labile bonds, so that heating of the "labelled" polymer in the presence of polymerizable monomer causes re-formation of the carbon centered free radicals with dissociation of the polymer-stable free radical compound bond, to effect graft copolymerization of the monomer. Controlled polymerization takes place by repetition of the three steps (dissociation, monomer addition, re-association) to give a graft copolymer with substantially uniform branch chains, each capped with a stable free radical group.

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