Polyalkylene terephthalate and organopolysiloxane-polycarbonate block copolymer blends

Claim 2

An improved high impact low warp polymer blend comprising a polyalkylene terephthalate resin, an organopolysiloxane-polycarbonate block copolymer, and a calcium carbonate filler.

Claim 3

The claim 1 blend, where on a weight basis at least 5 parts of the copolymer is present per 100 parts of resin, and less than 35 parts of the carbonate is present per 100 parts of resin and copolymer.

Claim 4

The claim 2 blend, where 5-30 parts of the copolymer and 5-30 parts of the carbonate are present.

Claim 5

The claim 3 blend where 10-25 parts of the copolymer and 10-25 parts of the carbonate are present.

Claim 6

The claim 1 blend, where said copolymer is of the formula ##STR5## where X is an integer equal to 1 to 1000, inclusive, preferably 2 to 100, n is a number average equal to 1 to 100, inclusive, preferably 5 to 40, a is a number average equal to 1.1 to 100, m is equal to 1, and Z is an integer equal to 1 to 1000, inclusive, preferably 5 to 12, E is a member selected from the class of hydrogen, lower alkyl radicals and halogen radicals and mixtures thereof, R is a member selected from the class of hydrogen, monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, and R' is a member selected from the class of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and cyanoalkyl radicals.

Claim 7

The claim 5 blend, where X equals about 7; Y equals about 8 to 10; Z equals about 1; a equals about 2; n equals about 10; and m equals about 1.

Claim 8

The claim 5 blend where X equals about 10; Y equals about 8 to 10; Z equals about 1; a equals about 2; n equals about 20; and m equals about 1.

Claim 9

The claim 5 blend where X equals about 5; Y equals about 8 to 10; Z equals about 1; a equals about 2; n equals about 20; and m equals about 1.

Claim 10

The claim 1 blend where the particle size of the carbonate is less than 40 microns.

Claim 11

The claim 2 blend where less than 20 parts of fiber glass reinforcing filler per 100 parts of resin and copolymer is present.