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US 4,379,877 AGranted
Fire retardant thermoplastic molding compositions
AssigneeAtlantic Richfield Company
InventorUsama E. Younes
Life of this patent
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Abstract
A thermoplastic molding composition which comprises a homogeneous mixture of two thermoplastic copolymers is disclosed. In one of its more specific aspects, this invention pertains to a homogeneous mixture of a copolymer of a monovinyl aromatic monomer and an alpha, beta-unsaturated cyclic anhydride and a phosphorus-containing alternating copolymer.
Claims3
A thermoplastic molding composition comprising a homogeneous mixture of a copolymer of a monovinyl aromatic monomer and an alpha, beta-unsaturated cyclic anhydride and an alternating copolymer having the formula:
- ##STR4## wherein R.sup.1 represents a halogen, a (C.sub.1 to C.sub.10) alkyl or halogenated (C.sub.1 to C.sub.10) alkyl group, hydroxy, a (C.sub.1 to C.sub.10) alkoxy or halogenated (C.sub.1 to C.sub.10) alkoxy group, an aryl or halogenated aryl group, and an aryloxy or halogenated aryloxy group;
- X may or may not be present and represents oxygen or sulfur;
- W represents at least one monomer selected from the group consisting of dienes, styrenes, vinylidene chloride, vinyl esters, acrylic and methacrylic esters, and acrylonitrile;
- each R.sup.2 separately represents hydrogen, a (C.sub.1 to C.sub.4) alkyl group, or an aryl group;
- n represents an integer equal to or greater than 2;
- each m separately represents an integer from 1 to 20, and b represents an integer from 2 to 1000.
3 more elements
Dependencies are inferred from the claim text.