US 4,542,185 A · Graft copolymers of alkyl methacrylates--alkyl acrylates onto diene--alkyl acrylate copolymers and their use as impact modifiers

Abstract

The impact resistance of resin compositions consisting of a thermoplastic polymer, particularly a homopolymer or copolymer of vinyl chloride can be improved by an impact additive of the graft copolymer type. The graft copolymer impact additive consists of a backbone composed of a statistical copolymer of butadiene or isoprene, an alkyl acrylate of a C.sub.2 to C.sub.12 alkyl, and optionally a polyfunctional cross-linking agent, onto which are grafted the chains of a statistical copolymer of an alkyl methacrylate of a C.sub.1 to C.sub.4 alkyl, particularly methyl methacrylate, and an alkyl acrylate of a C.sub.1 to C.sub.8 alkyl, particularly ethyl acrylate. The backbone of the graft copolymer impact additive comprises 0.5-35% by weight butadiene or isoprene, and up to 10 mole % of the cross-linking agent, while the graft chains of the graft copolymer comprise 5 to 50 mole % of the alkyl acrylate of a C.sub.1 to C.sub.8 alkyl, and the weight ratio between the grafted chains and the backbone can range from 10 to 200%. The resin compositions are particularly useful to improve impact strength at low temperatures.

Claims39

Dependent claims

A synthetic resin composition having improved impact strength which comprises

(a) a thermoplastic polymer
(b) from 0.5 to 50 parts by weight per 100 parts by weight of thermoplastic polymer of a graft copolymer impact additive which comprises
(i) a backbone consisting essentially of a statistical copolymer of butadiene or isoprene with an alkyl acrylate of C.sub.2 to C.sub.12 alkyl, wherein the butadiene or isoprene represents from about 0.5 to about 35% of the weight of the backbone;
(ii) a copolymer grafted onto said backbone, said grafted copolymer consisting essentially of a statistical copolymer of C.sub.1 -C.sub.4 alkyl methacrylate with a C.sub.1 -C.sub.8 alkyl acrylate, said alkyl acrylate comprising a molar proportion of from 5 to 50%, said grafted copolymer representing from 10 to 200% of the weight of the backbone.

1 more element

Dependencies are inferred from the claim text.

Graft copolymers of alkyl methacrylates--alkyl acrylates onto diene--alkyl acrylate copolymers and their use as impact modifiers

Life of this patent

Graft copolymers of alkyl methacrylates--alkyl acrylates onto diene--alkyl acrylate copolymers and their use as impact modifiers

Life of this patent

Abstract

Claims39