Grafting polyolefin blends and use of the graft copolymer blends as an adhesion promoter and for the preparation of ionomers
AssigneeBASF SE
InventorsNorbert Hasenbein, Guenther Schweier, Hans Gropper, Rainer A. Werner
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Abstract
Ethylenically unsaturated carboxylic acids and/or carboxylic anhydrides are grafted onto polyolefin blends by a process in which the polyolefin blend consists of from 5 to 49 parts by weight of an ethylene/propylene block copolymer having an ethylene content of less than or equal to 20% by weight and from 51 to 95 parts by weight of a homopolymer or copolymer of ethylene, and the resulting graft copolymer blends are used as adhesion promoters, in particular for polyethylene/adhesion promotor/steel composites, and for the preparation of ionomers.
Claims6
A process for preparing a graft copolymer of grafting monomers selected from the group consisting of ethylenically unsaturated carboxylic acids, carboxylic anhydrides and mixtures thereof and a polyolefin blend of from 51 to 95 parts by weight of a homopolymer or copolymer of ethylene (A) and from 5 to 49 parts by weight of an ethylene/propylene block copolymer (B), which differs from (A), having an ethylene content of less than or about equal to 20% by weight and a propylene content of greater than or equal to 80% by weight, said process comprising:
- mixing 0.01 to 0.5% by weight, based on the polyolefin blend, of said monomers with the polyolefin blend in a molten state;
- and
- carrying out the grafting reaction at a temperature of from 21.degree. C. to 300.degree. C. and under a pressure of from 1 to 500 bar in the absence of a free-radical initiator.
Dependencies are inferred from the claim text.