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) an MBS polymer prepared by graft polymerization of methyl methacrylate, or mixture thereof with a minor proportion of an ethylenically unsaturated comonomer, copolymerizable with said methacrylate monomer, in the presence of a polybutadiene or a butadienestyrene trunk copolymer rubber or by blending a methyl methacrylate/styrene copolymer with polybutadiene or a copolymer of butadiene.

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, ##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, ##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 MBS polymer is essentially the only polymeric additive to the polyester.

Claim 11

The composition of claim 1 wherein the MBS polymer consists essentially of methyl methacrylate 1,3-butadiene and styrene monomer components.

Claim 12

The composition of claim 1 wherein the MBS polymer also contains an acrylonitrile monomer component.

Claim 13

The composition of claim 1 wherein the MBS 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 MBS polymer.

Claim 14

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

Claim 15

The composition of claim 13 wherein the MBS polymer is present in an amount of from about 5 to about 30 parts per 100 parts by weight of the mixture.

Claim 16

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

Claim 17

The composition of claim 15 wherein said filler material is particulate glass.

Claim 18

The composition of claim 16 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 MBS polymer.

Claim 19

The composition of claim 17 wherein the glass fiber contains or organic coupling agent.

Claim 20

The composition of claim 18 wherein said organic coupling agent is a silane.

Claim 21

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) and MBS polymer prepared by graft polymerization of methyl methacrylate, or mixture thereof with a minor proportion of an ethylenically unsaturated comonomer, copolymerizable with said methacrylate monomer, in the presence of a polybutadiene or a butadienestyrene trunk copolymer rubber or by blending a methyl methacrylate/styrene copolymer with polybutadiene or a copolymer of butadiene.

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) and MBS polymer prepared by graft polymerization of methyl methacrylate, or mixture thereof with a minor proportion of an ethylenically unsaturated comonomer, copolymerizable with said methacrylate monomer, in the presence of a polybutadiene or a butadienestyrene trunk copolymer rubber or by blending a methyl methacrylate/styrene copolymer with polybutadiene or a copolymer of butadiene.

Claim 23

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 an MBS polymer per 100 parts by weight of the resin mixture to said polyester, said MBS polymer being prepared by graft polymerization of methyl methacrylate, or mixture thereof with a minor proportion of an ethylenically unsaturated comonomer, copolymerizable with said methacrylate monomer, in the presence of a polybutadiene or a butadienestyrene trunk copolymer rubber or by blending a methyl methacrylate/styrene copolymer with polybutadiene or a copolymer of butadiene.

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 an MBS polymer per 100 parts by weight of the resin mixture to said polyester, said MBS polymer being prepared by graft polymerization of methyl methacrylate, or mixture thereof with a minor proportion of an ethylenically unsaturated comonomer, copolymerizable with said methacrylate monomer, in the presence of a polybutadiene or a butadienestyrene trunk copolymer rubber or by blending a methyl methacrylate/styrene copolymer with polybutadiene or a copolymer of butadiene.

Claim 25

A molded article formed from the composition of claim 1.

Claim 26

A molded article formed from the composition of claim 15.

Claim 27

A molded article formed from the composition of claim 18.

Claim 28

A molded article formed from the composition of claim 20.