Blends of elastomeric polyetherester copolymers with thermoplastic polycarbonates

Claim 2

An improved copolyetherester-containing blend which has improved processability and tensile strength consisting essentially of an admixture of copolyetherester with polycarbonate and, optionally, a poly(alkylene terephthalate).

Claim 3

The improved copolyetherester-containing blend of claim 1 wherein the copolyetherester consists essentially of a multiplicity of recurring intralinear long-chain and short-chain ester units connected head-to-tail through ester linkages, said long-chain ester units being represented by the following structure: and said short-chain ester units being represented by the following structure: wherein G is a divalent radical remaining after removal of terminal hydroxy groups from poly(alkylene oxide) glycols having a carbon-to-oxygen ratio of about 2.0-4.3 and a molecular weight between about 400-6000; R is a divalent radical remaining after removal of carboxyl groups from one or more dicarboxylic acids having a molecular weight less than about 300; and D is a divalent radical remaining after removal of hydroxyl groups from one or more saturated or unsaturated, low molecular weight diols having a molecular weight less than about 250, with the provisions that the short-chain ester units constitute about 15-95% by weight, preferably 25-90% by weight, of the copolyetherester.

Claim 4

The improved copolyetherester-containing blend of claim 1 wherein the copolyetherester is derived from butane diol, poly(tetramethylene oxide) glycol and dimethylterephthalate.

Claim 5

The improved copolyetherester-containing blend of claim 1 wherein the copolyetherester is derived from butane diol, hexane diol, poly(tetramethylene oxide) glycol and dimethyltetephthalate.

Claim 6

The improved copolyetherester-containing blend of claim 2 wherein the copolyetherester is derived from butane diol, butenediol, poly(tetramethylene oxide) glycol and dimethylterephthalate.

Claim 7

The improved copolyetherester-containing blend of claim 1 wherein the property improving amount of polycarbonate is from about 5 to about 100 parts by weight based on 100 parts by weight of the copolyetherester.

Claim 8

The improved copolyetherester-containing blend of claim 1 wherein the polycarbonate is a aromatic polycarbonate derived from 2,2-bis(4-hydroxyphenyl) propane.

Claim 9

The improved copolyetherester-containing blend of claim 1 wherein the poly(alkylene terephthalate) is present and an amount from about 0 to about 85% by weight based on the combination of poly(alkylene terephthalte) and polycarbonate.

Claim 10

The improved copolyetherester-containing blend of claim 1 wherein the poly(alkylene terephthalate) is present in an amount from about 0 to about 75% by weight based on the combination of poly(alkylene terephthalate) and polycarbonate.

Claim 11

The improved copolyetherester-containing blend of claim 1 wherein the poly(alkylene terephthalate) is present in an amount from about 0 to about 50% by weight based on the combination of poly(alkylene terephthalate) and polycarbonate.

Claim 12

The improved copolyetherester-containi- 4 blend of claim 8 wherein the poly(alkylenr terephthalate) is poly(butylene terephthalate).

Claim 13

The improved copolyetherester-containing blend of claim 1 which further consists of up to 60% by weight of an inorganic filler or reinforcing agent selected from the group consisting essentially of carbon powder, clay, mica, and chopped fiberglass.

Claim 14

The improved copolyetherester-containing blend of claim 1 which further consists of an effective flame retarding amount of a flame retardant concentrate.

Claim 15

The improved'copolyetherester-containing blend of claim 13 wherein the flame retardant composition is derived from brominated phenols.

Claim 16

The copolyetherester-containing blend of claim 14 which further consists of a flame retardant synergist.