Back to results
US 4,539,371 AGranted
High impact poly(p-methylstyrene) polymers
AssigneeMobil Oil Corporation
InventorBinnur Z. Gunesin
Life of this patent
Estimating the term…
Abstract
The present invention provides a method for improving the environmental stress crack resistance of high impact poly(p-methylstyrene) by blending high impact poly(p-methylstyrene) with an additive copolymer having a higher environmental stress crack resistance. The invention further provides a shaped container resistant to fats.
Claims6
A method of improving the environmental stress crack resistance of high impact poly(p-methylstyrene), comprising
- (a) melting said high impact poly(p-methylstyrene) at a temperature between 150.degree. and 250.degree. C.;
- (b) blending an additive copolymer with said melted high impact poly(p-methylstyrene) capable of imparting a higher environmental stress crack resistance to the final blend of said high impact poly(p-methylstyrene) and said additive copolymer, said additive copolymer being selected from the group comprising linear low density polyethylene, polypropylene, polycarbonate, ethylene methylacrylate acrylic acid terpolymer, polyethylene teraphalate glycol, polystyrene-polybutadiene diblock, and budadiene-paramethylstyrene diblock, said blending occurring at a temperature between 150.degree. and 250.degree. C.
Dependencies are inferred from the claim text.