Flow carbonate polymer blends
AssigneeThe Dow Chemical Company
InventorsHoang T. Pham, Cheryl L. Weckle, Jamie J. Stanley, Joseph M. Ceraso
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Abstract
Disclosed is a polymer blend composition containing an aromatic carbonate polymer and a rubber-modified monovinylidene aromatic copolymer comprising a star-branched rubber and optionally, a linear rubber. The polymer blend compositions according to the invention have a desirable balance of processability and when molded, impact strength.
Claims29
A polymer blend composition comprising, in admixture:
- (a) an aromatic carbonate polymer and
- (b) a rubber-modified copolymer comprising
- (i) a continuous matrix phase comprising a copolymer of a monovinylidene aromatic monomer and an ethylenically unsaturated nitrile monomer and
- (ii) a rubber comprising
- (1) a star-branched rubber having three or more arms, said arms comprising one or more 1, 3-butadiene homopolymer and
- (2) optionally, a linear rubber,
- wherein the rubber is dispersed as discrete rubber particles in the matrix.
A method for preparing a polymer blend composition comprising the step of combining:
- (a) an aromatic carbonate polymer and
- (b) a rubber-modified copolymer comprising
- (i) a continuous matrix phase comprising a copolymer of a monovinylidene aromatic monomer and an ethylenically unsaturated nitrile monomer and
- (ii) a rubber comprising
- (1) a star-branched rubber having three or more arms, said arms comprising one or more 1, 3-butadiene homopolymer and
- (2) optionally, a linear rubber,
- wherein the rubber is dispersed as discrete rubber particles in the matrix.
A method for producing a molded or extruded article of a polymer blend composition comprising the steps of:
- (A) preparing a carbonate polymer composition comprising
- (a) an aromatic carbonate polymer and
- (b) a rubber-modified copolymer comprising
- (i) a continuous matrix phase comprising a copolymer of a monovinylidene aromatic monomer and an ethylenically unsaturated nitrile monomer and
- (ii) a rubber comprising
- (1) a star-branched rubber having three or more arms, said arms comprising one or more 1, 3-butadiene homopolymer and
- (2) optionally, a linear rubber,
- wherein the rubber is dispersed as discrete rubber particles in the matrix, and
- (B) molding or extruding said carbonate polymer composition into a molded or extruded article.
Dependencies are inferred from the claim text.