Thermoplastic polyesters with improved shock-proof properties and impact modifying composition

Thermoplastic polyester compositions comprising, by weight, the total being 100%:

• 60 to 99% of a thermoplastic polyester;
• 1 to 40% of an impact modifier comprising:
• (a) a core-shell copolymer (A);
• (b) an ethylene copolymer (B) comprising ethylene, an unsaturated carboxylic acid anhydride and an ester of an unsaturated carboxylic acid (B1);
• and
• (c) a copolymer (C) selected from copolymers consisting of ethylene and alkyl(meth)acrylate (C1), optionally neutralized copolymers consisting of ethylene and (meth)acrylic acid ethylene (C2) and blends thereof,
• wherein the proportions by weight of (A), (B) and (C) are 15 to 80, 5 to 60 and 5 to 80%, respectively, and (A)+(B)+(C)=100%.

Polyethylene terephthalate compositions free of polycarbonate, comprising, by weight, the total being 100%:

• 60 to 99% of polyethylene terephthalate;
• 1 to 40% of an impact modifier comprising:
• (a) a core-shell copolymer (A);
• (b) an ethylene copolymer (B) comprising ethylene, an unsaturated carboxylic acid anhydride and an ester of an unsaturated carboxylic acid (B1), ethylene-unsaturated epoxide copolymers (B2) and blends thereof;
• and
• (c) a copolymer (C) selected from copolymers consisting of ethylene and alkyl(meth)acrylate (C1), copolymers consisting of ethylene and (meth)acrylic acid (C2) and blends thereof.