Arco Chemical Technology, L.p.

Elisabeth S Papazoglou

Jay S Rosenthal

A process for the preparation of moldable polymer blends having improved low temperature impact properties and reduced brittleness is disclosed. In one embodiment, a polyamide such as nylon-6 and an anhydride functionalized elastomer such as an EPDM rubber grafted with maleic anhydride are first melt-blended. The resulting composition is then blended with a thermoplastic copolymer of an .alpha.,.beta.-unsaturated carboxylic acid anhydride such as maleic anhydride and a monovinyl aromatic monomer such as styrene. The moldable polymer blends thus obtained are suitable for use as engineering resins.

Process for the preparation of polymide blends having improved low

Moldable multi-phase polyblends having excellent impact properties are disclosed which comprise blends of a polyamide, a thermoplastic copolymer of an .alpha.,.beta.-unsaturated carboxylic acid and a monovinyl aromatic monomer, and an anhydride-functionalized elastomer. The functionalized elastomers are low in unsaturation, providing polyblends having good oxidative stability, and are .alpha.,.beta.-carboxylic acid anhydride adducts of EPDM-type rubbers, hydrogenated block or random copolymers of monovinyl aromatic monomers and conjugated dienes, or hydrogenated polymers of conjugated dienes. Optimum impact properties are achieved by combining the components of the polyblends using particular melt-blending procedures.

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West Chester, PA, United States of America

Elisabeth S Papazoglou