Graft polymers with a polyurethane graft base, processes for the

Details Graft polymers with a polyurethane graft base, processes for the Graft polymers with a polyurethane graft base, processes for the

1991-12-18

1993-04-13

Seidleck, James J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525454, C08L 7504

Patent

active

052023940

ABSTRACT:
Graft polymers in which carboxylic acid vinyl esters and if appropriate other ethylenically unsaturated monomers are grafted polymerically onto polyurethane graft bases by means of grafting polymerization initiated by free radicals, and hydrolysis products of the graft polymers can be obtained by grafting carboxylic acid vinyl esters with 3 to 20 carbon atoms and if appropriate other ethylenically unsaturated polymerizable monomers, which are copolymerizable if appropriate, in amounts of 10 to 99% by weight, based on the graft polymer, onto a polyurethane graft base by grafting polymerization initiated by free radicals, and if appropriate subsequently partly or completely hydrolyzing the vinyl ester units and if appropriate other hydrolyzable monomer units in the grafted-on polymer radicals of the graft polymers by hydrolysis and/or alcoholysis. Preferred vinyl esters to be grafted on are vinyl acetate and/or vinyl propionate and if appropriate vinyl versatate. The grafting polymerization is carried out in solution or in bulk and can also be carried out in emulsion or suspension.

REFERENCES:
patent: 4521546 (1985-06-01), O'Connor et al.
patent: 4914142 (1990-04-01), Takarabe et al.
patent: 4923929 (1990-05-01), Ohwada et al.

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