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US 4,900,786 AGranted
Polyphenylene ether/rubber modified polystyrene composition suitable for blow molding large parts
AssigneeGeneral Electric Company
InventorsVisvaldis Abolins, Alexandros Hasson
Life of this patent
Estimating the term…
Abstract
Polyphenylene ether/rubber modified polystyrene compositions are uniquely suitable for flow molding large, e.g., 10 pounds or more, parts when the rubber modified polystyrene contains at least 12 percent by weight of particulate rubber, the rubber particles have an average diameter of greater than about 3 microns, and the compositions have an R* value of greater than about 16. R* is the ratio of the low shear rate viscosity to the high shear rate viscosity at the optimum processing temperature.
Claims7
A thermoplastic composition suitable for blow molding large parts, said composition comprising:
- (a) from about 5 to about 95 parts by weight of a polyphenylene ether resin;
- and
- (b) from about 95 to about 5 parts by weight of a rubber modified high impact polystyrene resin having a particulate rubber content of greater than about 12 percent by weight, based on the weight of component (b), the rubber particles having an average diameter of greater than about 3 microns, said composition having an R* value of greater than about 16, the R* value being defined as the ratio of the low shear rate viscosity and the high shear rate viscosity at the optimum processing temperature as determined in a viscometer.
Dependencies are inferred from the claim text.