Thermoplastic molding compositions of rubber modified copolymers of a vinyl aromatic compound and an α,β-unsaturated cyclic anhydride

Claim 2

A thermoplastic molding composition which comprises: (a) from 40-95 parts by weight of a rubber modified copolymer of a vinyl aromatic compound and an α,β-unsaturated anhydride; (b) from 5-60 parts by weight of an emulsion graft polymerization product of an acrylic monomer alone or in admixture with a styrene monomer on a rubbery diene homopolymer or styrene-diene copolymer backbone; and (c) from 5-50 parts by weight of a polyphenylene ether resin.

Claim 3

A composition as defined in claim 1 wherein said composition includes from 5-50 parts by weight of a polyphenylene ether of the formula: ##STR4## wherein the oxygen ether atom of one unit is connected to the benzene nucleus of the next adjoining unit; n is the degree of polymerization; and each Q is a monovalent substituent selected from hydrogen, halogen, hydrocarbon radicals, halohydrocarbon radicals having at least two carbon atoms between the halogen atom and the phenyl nucleus.

Claim 4

A composition as defined in claim 1 wherein the copolymer of a vinyl aromatic compound and an unsaturated cyclic anhydride is based on a vinyl aromatic compound of the formula: ##STR5## wherein R 1 and R 2 are selected from the group consisting of lower alkyl or alkenyl groups of from 1 to 6 carbon atoms and hydrogen; R 3 and R 4 are selected from the group consisting of chloro, bromo, hydrogen and lower alkyl of from 1 to 6 carbon atoms; R 5 and R 6 are selected from the group consisting of hydrogen and lower alkyl and alkenyl groups of from 1 to 6 carbon atoms or R 5 and R 6 may be concatenated together with hydrocarbyl groups to form a naphthyl group, said compounds being free of any substituent that has a tertiary carbon atom.

Claim 5

A composition as defined in claim 1 where said rubber modified copolymer of a vinyl aromatic compound and a α,β-unsaturated cyclic anhydride comprises from 40 to 1 parts by weight of the α,β-unsaturated cyclic anhydride, from 60 to 99 parts by weight of a vinyl aromatic compound and 2 to 25 parts by weight of rubber.

Claim 6

A composition as defined in claim 1 wherein the emulsion graft polymerization product comprises (1) from 20-80% by weight of a backbone polymer of the units of butadiene or butadiene and styrene, wherein the butadiene units are present in quantities of at least 40% by weight of the backbone polymer, (2) 80-20% by weight of an acrylic monomer graft polymerized to (1); said acrylic monomer units being selected from the group consisting of lower alkyl methacrylates, alicyclic methacrylates and alkyl acrylates, and (3) 0 to 60% by weight of a styrene monomer graft polymerized to (1) or (2); sequentially or simultanesouly with the polymerization of (2).

Claim 7

A composition as defined in claim 1 which contains from 5-30 parts by weight of poly(2,6-dimethyl-1,4-phenylene) ether and from 40-80 parts by weight of a rubber modified copolymer of styrene-maleic anhydride.

Claim 8

A thermoplastic molding composition which comprises (a) from 40-95 parts by weight of a rubber modified copolymer of styrene-maleic anhydride; (b) from 5-60 parts by weight of an emulsion graft polymerization product which comprises (1) from 20-80% by weight of a backbone polymer of the units of butadiene or butadiene-styrene wherein the butadiene units are present in quantities of at least 40% by weight of the backbone polymer, (2) 80-20% by weight of an acrylic monomer graft polymerized to (1); said acrylic monomer units being selected from the group consisting of lower alkyl methacrylates and alkyl acrylates and (3) 0 to 60% by weight of a styrene monomer graft polymerized to (1) or (2); sequentially or simultaneously with the polymerization of (2); and (c) from 5 to 50 parts by weight of poly(2,6-dimethyl-1,4-phenylene) ether resin.

Claim 9

A thermoplastic molding composition which comprises (a) from 40-95 parts by weight of a rubber modified copolymer of styrene-maleic anhydride; (b) from 5-60 parts by weight of an emulsion graft polymerization product which comprises (1) from 20-80% by weight of a backbone polymer of the units of butadiene or butadiene-styrene wherein the butadiene units are present in quantities of at least 40% by weight of the backbone polymer, (2) 80-20% by weight of an acrylic monomer graft polymerized to (1); said acrylic monomer units being selected from the group consisting of lower alkyl methacrylates and alkyl acrylates and (3) 0 to 60% by weight of a styrene monomer graft polymerized to (1) or (2); sequentially or simultaneously with the polymerization of (2); and (c) from 5 to 50 parts by weight of poly(2,6-dimethyl-1,4-phenylene) ether resin.

Claim 10

A composition as defined in claim 1 including a reinforcing amount of a reinforcing filler.

Claim 11

A composition as defined in claim 1 including a flame retardant amount of a flame retardant agent.

Claim 12

A thermoplastic molding composition which comprises: (a) from 40-95 parts by weight of a rubber modified copolymer of a vinyl aromatic compound and an α,β-unsaturated anhydride that contains from 2-25 parts by weight of rubber, 60-99 parts by weight of a vinyl aromatic compound and from 40 to 1 parts by weight of the α,β-unsaturated anhydride; (b) from 5-60 parts by weight of an emulsion graft polymerization product of an acrylic monomer alone or in admixture with a styrene monomer on a rubbery diene homopolymer or styrene-diene copolymer backbone that contains 80-20% by weight of acrylic monomer, 0-60% by weight of styrene and 20-80% by weight of rubbery diene homopolymer or styrene-diene copolymer backbone; and (c) from 5-50 parts by weight of a polyphenylene ether resin.

Claim 13

A thermoplastic molding composition which comprises: (a) from 40-95 parts by weight of a rubber modified copolymer of a vinyl aromatic compound and an α,β-unsaturated anhydride that contains from 2-25 parts by weight of rubber, 60-99 parts by weight of a vinyl aromatic compound and from 40 to 1 parts by weight of the α,β-unsaturated anhydride; (b) from 5-60 parts by weight of an emulsion graft polymerization product of an acrylic monomer alone or in admixture with a styrene monomer on a rubbery diene homopolymer or styrene-diene copolymer backbone that contains 80-20% by weight of acrylic monomer, 0-60% by weight of styrene and 20-80% by weight of rubbery diene homopolymer or styrene-diene copolymer backbone; and (c) from 5-50 parts by weight of a polyphenylene ether resin.

Claim 14

A composition as defined in claim 10 which includes from 5-30 parts by weight of poly(2,6-dimethyl-1,4-phenylene) ether and from 40-80 parts by weight of the rubber modified copolymer of styrene-maleic anhydride.