Atlantic Richfield Company

Peter S Francis

Frank E Lordi

A molded article which consists of a core comprising a copolymer of a monovinyl aromatic monomer and an alpha, beta-unsaturated cyclic anhydride and a grafted water-swollen hydrophilic polymer coating on the core is particularly suitable for use as a blood-contacting article.

Thromboresistant molded article and method for its production

Moldable compositions which comprise a high molecular weight nonequimolar copolymer of an ethylenically unsaturated dicarboxylic acid or its derivative, and at least one copolymerizable monomer and, a surface gloss enhancing agent selected from the group consisting of amides or N,N-dimethylamides of linear and saturated or unsaturated fatty acids containing 16 or more carbon atoms and low molecular weight copolymers of styrene and maleic anhydride, facilitate the production of molded articles exhibiting improved surface gloss.

Moldable compositions having improved surface gloss

A blend having advantageous toughness and impact resistance is prepared by hot working of a mixture of from about 5 to about 25% of a high impact polystyrene containing from about 4 to about 16% rubber, said high impact polystyrene having an average molecular weight which is significantly higher than the average molecular weight of the hereafter described styrene-maleic anhydride resin and about 95 to 75% of a styrene-maleic anhydride resin containing from about 80 to 94% styrene, from about 5 to 15% maleic anhydride, and from about 1 to about 5% rubber. The blend is especially useful in molding fiber-reinforced articles. The blend has outstanding toughness when green. That is, hot and freshly molded articles can be removed from the mold with minimized breakage, thus decreasing the amount of scrap arising from the breakage of a green molded item at the time of being ejected and/or removed from a mold.

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Rose Valley, PA, United States of America

Peter S Francis