High-impact polyester/styrene-maleic anhydride copolymer blends

Claim 1

Molding composition consisting of a blend of (a) 70 weight percent to 30 weight percent copolyester consisting of repeating units from terephthalic acid, repeating units from 1,4-cyclohexanedimethanol present in the amount of 25 to 90 mol % and repeating units from a second glycol having 2 to 6 carbon atoms present in the amount of 75 to 10 mol %, wherein the total mol % of glycol is equal to 100 mol %, and (b) 30 weight percent to 70 weight percent thermoplastic rubber-modified vinyl aromatic polymer composition having a notched Izod impact strength at 23° C. of at least 3.5 ft./lb./in. and a flexural modulus of no more than 325,000 psi comprising: (1) from 60 to 93% by weight of a non-equimolar copolymer of 70 to 98% by weight based on copolymer of a vinyl aromatic monomer, and from 2 to 30% by weight based on copolymer of an unsaturated dicarboxylic acid moiety copolymerizable therewith, and (2) from 7 to 40% by weight of at least two differing rubbery additives which were present during the copolymerization of the monomers of component (1) wherein said rubbery additives comprise from 5 to 20% by weight based on total composition of at least one high conjugated diene-vinyl aromatic copolymer and from 2 to 20% by weight based on total composition of at least one high vinyl aromatic conjugated diene copolymer, with the further limitations that said at least one high conjugated diene-vinyl aromatic copolymer comprises from about 60 to about 98% by weight of the conjugated diene, and that said at least one high vinyl aromatic conjugated diene copolymer is a block copolymer which comprises a greater amount of vinyl aromatic than conjugated diene monomer.