Heat resistant thermoplastic copolymers
AssigneeArco Chemical Technology, L.P.
InventorRamesh Mallikarjun
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Abstract
Thermoplastic copolymers having excellent tensile and heat resistance properties are obtained by copolymerization of a monovinyl aromatic monomer, an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, an .alpha., .beta.-unsaturated carboxylic acid, and a C.sub.1 -C.sub.4 alkyl ester of methacrylic acid. In a preferred embodiment, a styrene/maleic anhydride/methacrylic acid/methyl methacrylate random copolymer is prepared. Impact properties are improved by incorporation of an elastomer.
Claims17
A thermoplastic copolymer comprised of
- (a) from about 40 to 97 weight percent of recurring units of a monovinyl aromatic monomer;
- (b) from about 1 to 30 weight percent of recurring units of an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride;
- (c) from about 1 to 30 weight percent of recurring units of an .alpha.,.beta.-unsaturated carboxylic acid;
- and
- (d) from about 1 to 40 weight percent of recurring units of a C.sub.1 -C.sub.4 alkyl ester of methacrylic acid;
- wherein the thermoplastic copolymer has a substantially random structure.
A thermoplastic copolymer comprised of
- (a) from about 40 to 74 weight percent of recurring units of styrene;
- (b) from about 5 to 20 weight percent of recurring units of maleic anhydride;
- (c) from about 3 to 12 weight percent of recurring units of methacrylic acid;
- and
- (d) from about 18 to 35 weight percent of recurring units of methyl methacrylate;
- wherein the thermoplastic copolymer has a substantially random structure.
A process for producing a thermoplastic copolymer having a substantially random structure comprising copolymerizing a monovinyl aromatic monomer, an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, an .alpha.,.beta.-unsaturated carboxylic acid, and a C.sub.1 -C.sub.4 alkyl ester of methacrylic acid, wherein the resulting thermoplastic copolymer is comprised of
- (a) from about 40 to 97 weight percent of recurring units of the monovinyl aromatic monomer;
- (b) from about 1 to 30 weight percent of recurring units of the .alpha.,.beta.-unsaturated dicarboxylic acid anhydride;
- (c) from about 1 to 30 weight percent of recurring units of the .alpha.,.beta.-unsaturated carboxylic acid;
- and
- (d) from about 1 to 40 weight percent of recurring units of the C.sub.1 -C.sub.4 alkyl ester of methacrylic acid.
A process for producing a thermoplastic copolymer having a substantially random structure comprising copolymerizing styrene, maleic anhydride, methacrylic acid, and methyl methacrylate in the presence of an effective amount of a free-radical initiator, wherein the resulting thermoplastic copolymer is comprised of
- (a) from about 40 to 74 weight percent of recurring units of styrene;
- (b) from about 5 to 20 weight percent of recurring units of maleic anhydride;
- (c) from about 3 to 12 weight percent of recurring units of methacrylic acid;
- and
- (d) from about 18 to 35 weight percent of recurring units of methyl methacrylate.
Dependencies are inferred from the claim text.