Process for graft copolymerization of a pre-formed substrate

Details Process for graft copolymerization of a pre-formed substrate Process for graft copolymerization of a pre-formed substrate

C - Chemistry, Metallurgy

08

F

400/2004, 204/91

C08F 291/00 (2006.01) C08F 291/18 (2006.01)

Patent

CA 1166386

Abstract A process for modifying the surface characteristics of a pre-formed polymeric substrate to impart hydrophilicity, hydrophobicity, or other desired properties thereto, by peroxidizing the surface of the substrate and then allowing the active sites along the polymer chains to generate free radicals which induce graft polymerization of a suitable ethylenic monomer (or other ethylenically-unsaturated compound) onto the surface of the substrate is described. Such graft copolymerization is undertaken in the presence of variable valence metal ions in a reduced state under acidic conditions and at selected reaction times and relatively low temperatures, and in the presence of squarate ions (diketocyclobutenediol) to control tbe physical characteristics of the surface graft and to restore the metal ions to their lower valence state without at the same time producing deleterious by-products.

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