Process for the production of cross-linked graft copolymers
AssigneeBayer Aktiengesellschaft
InventorsUlrich Steffen, Heinrich Alberts, Leo Morbitzer
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Abstract
A process for the production of cross-linked graft copolymers by the radically initiated precipitation copolymerization of an ethylene/vinyl ester copolymer as graft base and a mixture to be grafted of one or more aromatic monovinyl compounds, acrylonitrile and/or methacrylonitrile, a cross-linking agent containing two or more carbon-carbon double bonds, and, optionally, another monoolefinically unsatured copolymerizable monomer wherein the ungrafted base is precipitated by the addition of a precipitating agent simultaneously with the precipitating cross-linked graft copolymer.
Claims6
A process for the production of a cross-linked graft copolymer by the radically initiated precipitation copolymerization of:
- (A) from 10 to 80%, by weight, of an ethylene/vinyl ester copolymer as graft base;
- and
- (B) from 90 to 20%, by weight, of a mixture to be grafted of
- (I) from 93.9 to 48%, by weight, of styrene;
- (II) from 5 to 30%, by weight, of acrylonitrile;
- (III) from 1 to 10%, by weight, of a cross-linking agent having two or more carbon-carbon double bonds, and
- (IV) from 0.1 to 12%, by weight, of another monoolefinically unsaturated copolymerizable monomer;
- such that the sum of (A) and (B) and (I) to (IV) is in each case 100%, by weight, wherein the ungrafted base is precipitated by the addition of a precipitating agent simultaneously with the precipitating cross-linked graft copolymer.
Dependencies are inferred from the claim text.