Polymer blends with improved hydrolytic stability

Claim 2

A thermoplastic polymeric composition comprising, in admixture, (a) a linear aromatic polyester of monomer components consisting essentially of a bisphenol and a dicarboxylic acid, and (b) a SAN polymer.

Claim 3

The composition of claim 1 wherein said dicarboxylic acid has the formula: ##STR5## wherein Z is alkylene, --Ar-- or --Ar--Y--Ar-- where Ar is aromatic, Y is alkylene, haloalkylene, --O--, --S--, --SO 2 --, --SO 3 --, --CO--, ##STR6## wherein G is alkyl, haloalkyl, aryl, haloaryl, alkylaryl, haloalkylaryl, arylalkyl, haloarylalkyl, cycloalkyl or cyclohaloalkyl; and n is 0 or 1.

Claim 4

The composition of claim 2 wherein said dicarboxylic acid is an aromatic dicarboxylic acid.

Claim 5

The composition of claim 3 wherein said aromatic dicarboxylic acid is selected from the group consisting of isophthalic acid, terephthalic acid, and mixtures thereof.

Claim 6

The composition of claim 1 wherein said bisphenol has the formula: ##STR7## wherein Ar is aromatic, G is alkyl, haloalkyl, aryl, haloaryl, alkylaryl, haloalkylaryl, arylalkyl, haloarylalkyl, cycloalkyl, or cyclohaloalkyl; E is divalent alkylene, haloalkylene, cycloalkylene, halocycloalkylene, arylene, or haloarylene, --O--, --S--, --SO--, --SO 2 --, --SO 3 --, --CO--, ##STR8## T and T' are independently selected from the group consisting of halogen, G and OG; m is an integer from 0 to the number of replaceable hydrogen atoms on E; b is an integer from 0 to the number of replaceable hydrogen atoms on Ar, and x is 0 or 1.

Claim 7

The composition of claim 5 wherein the bisphenol is bisphenol A.

Claim 8

The composition of claim 3 wherein the polyester is a transesterification-prepared polyester.

Claim 9

The composition of claim 7 wherein the polyester is prepared by transesterification reaction of the bisphenol and a di- ester of the dicarboxylic acid and a monohydroxy phenolic compound of the benzene or naphthalene series of 6 to 20 carbon atoms.

Claim 10

The composition of claim 1 wherein said SAN polymer is essentially the only polymeric additive to the polyester.

Claim 11

The composition of claim 1 wherein the SAN polymer is a copolymer of styrene and acrylonitrile.

Claim 12

The composition of claim 1 wherein the SAN polymer is a copolymer of styrene, alpha-methyl styrene and acrylonitrile.

Claim 13

The composition of claim 1 wherein the SAN polymer is present in an amount of from about 1 to 99 parts by weight per 100 parts by weight of the mixture of the polyester and the SAN polymer.

Claim 14

The composition of claim 12 wherein the SAN polymer is present in a minor weight proportion based on the combined weight of the polyester and the SAN polymer.

Claim 15

The composition of claim 13 wherein the SAN polymer is present in an amount of from about 1 to about 30 parts per 100 parts by weight of the mixture.

Claim 16

The composition of claim 14 wherein the SAN polymer is present in an amount of from about 1 to about 15 parts per 100 parts by weight of the mixture.

Claim 17

The composition of claim 1 which also includes a filler material.

Claim 18

The composition of claim 16 wherein said filler material is particulate glass.

Claim 19

The composition of claim 17 wherein the filler material is glass fiber present in an amount of about 5 to about 70 weight percent based on the combined weight of the polyester and the SAN polymer.

Claim 20

The composition of claim 18 wherein the glass fiber contains an organic coupling agent.

Claim 21

The composition of claim 19 whrein said organic coupling agent is a silane.

Claim 22

A thermoplastic polymeric composition comprising, in admixture, (a) a linear aromatic polyester prepared by transesterification of monomer reactants consisting essentially of a bisphenol and a diphenyl ester of an aromatic dicarboxylic acid, and (b) a SAN polymer.

Claim 23

A thermoplastic polymeric composition comprising, in admixture, (a) a linear aromatic polyester prepared by transesterification of monomer reactants consisting essentially of a bisphenol and a diphenyl ester of an aromatic dicarboxylic acid, and (b) a SAN polymer.

Claim 24

A process for improving the hydrolytic stability of a linear aromatic polyester resin of component monomers consisting essentially of a bisphenol and a dicarboxylic acid which comprises adding from about 1 to about 99 parts by weight of a SAN polymer per 100 parts by weight of the resin mixture to said polymer.

Claim 25

A process for improving the hydrolytic stability of a linear aromatic polyester resin of component monomers consisting essentially of a bisphenol and a dicarboxylic acid which comprises adding from about 1 to about 99 parts by weight of a SAN polymer per 100 parts by weight of the resin mixture to said polymer.

Claim 26

A molded article formed from the composition of claim 1.

Claim 27

A molded article formed from the composition of claim 16.

Claim 28

A molded article formed from the composition of claim 19.

Claim 29

A molded article formed from the composition of claim 21.