Patent ID: 7015261

Claim:
An additive for improving impact resistance, said additive comprising a blend of: (A) 80–20% by weight of a core/shell additive comprised of (1) 70–90% by weight of a cross linked elastomeric core compound of a) 20–100% by weight of a nucleus comprising a copolymer of n-octyl acrylate and 1,4-butanediol diacrylate, and b) surrounding said nucleus, 80–0% by weight of a covering comprising a copolymer of n-octyl acrylate and diallyl maleate, and (2) surrounding said core, 30–10% by weight of a shell grafted on to the said core, said shell composed of a polymer of an alkyl methacrylate, the alkyl group of which has a carbon number ranging from 1 to 4, and of an alkyl acrylate, the alkyl group of which has a carbon number ranging from 1 to 8, containing a molar amount of alkyl acrylate ranging from 5% to 40%, (B) 20 to 80 weight percent of a linear terpolymer which contains from 50 to 85 parts of units derived from ethylene, from 5 to 40 parts of units derived from a C1–C8 ester of (meth)acrylic acid, and from 2 to 10 parts of a copolymerizable monomer containing an epoxy group.