Highly impact resistant carbonate polymer blends
AssigneeThe Dow Chemical Company
InventorsCharles R. Finch, Leslie E. Wallace, Thomas E. Evans
Life of this patent
Estimating the term…
Abstract
Carbonate polymer compositions comprise extruded blends of a carbonate polymer and a copolymer consisting essentially of a monovinylidene aromatic comonomer and an .alpha.,.beta.-ethylenically unsaturated comonomer having a polar group. Optionally, a small amount of monovinylidene copolymer can be blended with said composition. Such compositions exhibit high impact strengths, improve the melt processability of the carbonate polymer and are advantageously highly transparent and exhibit low haze.
Claims20
An extruded sheet-like thermoplastic composition comprising a continuous phase comprising a carbonate polymer, and a discontinuous phase comprising a copolymer of a monovinylidene aromatic comonomer and an .alpha.,.beta.-ethylenically unsaturated comomoner having a pendant polar group and monovinylidene aromatic homopolymer;
- and wherein said copolymer is employed in amounts sufficient to improve the melt processability of the carbonate polymer;
- and wherein said discontinuous phase comprising a copolymer is in the form of laminar layers distributed within the continuous phase, which layers are essentially parallel to the surface of said sheet-like material;
- and wherein said copolymer is present in the composition in proportions such that said composition exhibits a Rheometrics Dart impact strength which nearly meets or exceeds that of the essentially pure carbonate polymer.
Dependencies are inferred from the claim text.