Blends of thermoplastic copolyester elastomers with vinyl chloride polymers

Claim 2

A uniform blend of about 5-95% by weight vinyl chloride polymer having a tensile modulus of at least about 50,000 p.s.i. and about 95-5% by weight of at least one .Iadd.elastomeric .Iaddend.thermoplastic segmented copolyester .[.polymer.]. containing (1) about 5-90 weight percent long chain ester units derived from at least one long chain glycol having a molecular weight of about 600--6000 and having a melting point of less than about 60°C. and a carbon-to-oxygen ratio of at least about 2 and at least one low molecular weight dicarboxylic acid having a molecular weight less than about 300 and (2) about 10-95 weight percent short chain ester units derived from at least one low molecular weight diol having a molecular weight of less than about 250 and at least one low molecular weight dicarboxylic acid having a molecular weight of less than about 300, said long chain ester units and short chain ester units randomly joined head-to-tail through ester linkages, said long chain ester units being represented by the formula ##EQU4##and said short chain ester units being represented by the formula ##EQU5##where G is a divalent radical remaining after the removal of terminal hydroxyl groups from said long chain glycol; R is a divalent radical remaining after removal of carboxyl groups from said dicarboxylic acid; and D is a divalent radical remaining after removal of hydroxyl from said low molecular weight diol .[...]..Iadd.; said copolyester having an inherent viscosity of at least 0.6..Iaddend.

Claim 3

The blend of claim 1 wherein the copolyester has a melting point of less than about 215°C.

Claim 4

The blend of claim 1 wherein the copolyester has 30-65 weight long chain ester units.

Claim 5

The blend of claim 1 wherein the long chain glycols are selected from the group consisting of poly(tetramethylene oxide)glycol, poly(1,2-propylene oxide)glycol, poly(ethylene oxide)glycol and poly(1,2-propylene oxide) glycol capped with ethylene oxide units.

Claim 6

The blends of claim 1 wherein the low molecular weight dicarboxylic acids are aromatic dicarboxylic acids containing 8-16 carbon atoms.

Claim 7

The blends of claim 1 wherein the low molecular weight diols are aliphatic diols containing 2-8 carbon atoms.

Claim 8

The blends of claim 1 wherein the vinyl chloride polymer is a vinyl chloride homopolymer or copolymer containing up to about 30% by weight of units from vinyl acetate or vinylidene chloride.

Claim 9

The blends of claim 1 containing 5-25% copolyester.

Claim 10

The blends of claim 1 containing about 10-50% copolyester.

Claim 11

The blends of claim 1 containing 30-60% copolyester.

Claim 12

The blends of claim 1 containing about 60-90% copolyester.

Claim 13

The blend of claim 1 wherein the copolyester is prepared by ester interchange of about 4.5 moles dimethyl terephthalate, 1.3 moles dimethyl isophthalate, 1 mole polytetramethylene glycol having a number average molecular weight of about 980, and excess 1,4-butanediol in the presence of a catalyst and a stabilizer, and polycondensation of the reaction product at about 250°C.

Claim 14

The blend of claim 1 wherein the copolyester is prepared by ester interchange of about 3.5 moles dimethyl terephthalate, 1 mole polytetramethyleneether glycol having a number average molecular weight of about 980, and excess 1,4 butanediol in the presence of a catalyst and a stabilizer.Iadd., .Iaddend.and polycondensation of the resulting reaction product at about 250°C.

Claim 15

The blend of claim 1 wherein the copolyester is prepared by ester interchange of about 7.9 moles dimethyl terephthalate, about 1 mole polytetramethyleneether glycol having a number average molecular weight of about 980, and excess 1,4-butanediol in the presence of a catalyst and a stabilizer.Iadd., .Iaddend.and polycondensation of the resulting reaction product at about 250°C. .Iadd.15. The blend of claim 1 wherein said copolyester has an inherent viscosity of 0.8-1.5. .Iaddend..Iadd.16. In a composition wherein a thermoplastic vinyl chloride polymer is uniformly blended with an elastomeric thermoplastic segmented copolyester, the improvement wherein said copolyester contains 1) 30 to 65% by weight of long-chain ester units derived from at least one long-chain glycol having a molecular weight of 600 to 6000 and at least one dicarboxylic acid having a molecular weight of less than 300, and 2) 70 to 35% by weight of short-chain ester units derived from at least one diol having a molecular weight of less than 250 and at least one dicarboxylic acid having a molecular weight of less than 300, and has an inherent viscosity of at least 0.6. .Iaddend..Iadd.17. The composition of claim 16 wherein the long-chain glycol is poly(tetramethylene oxide)glycol. .Iaddend..Iadd.18. The composition of claim 16 wherein the vinyl chloride polymer is polyvinyl chloride and the blend contains 30 to 60% by weight of copolyester. .Iaddend..Iadd.19. The composition of claim 16 wherein said copolyester has an inherent viscosity of 0.8-1.5. .Iaddend.