The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 1984
Filed:
Aug. 15, 1983
Frank E Lordi, West Chester, PA (US);
Jacob Triplett, West Chester, PA (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
A styrenic copolymer composition having increased resistance to heat, markedly improved impact resistance and excellent processability for injection molding, extrusion, thermal formability and the like is made by the polymerization of a vinyl aromatic monomer and an ethylenically unsaturated dicarboxylic acid moiety in the presence of at least two different rubbery additives. At least one, but not all of the rubbery additives consists of a copolymer of from 40 to 95% by weight of a vinyl aromatic monomer and 5 to 60% by weight of a conjugated diene monomer. This admixture permits addition of up to about 40% or more by weight of the total product of the rubbery additives. The properties achieved offer an attractive balance found only in higher priced engineering polymer materials. The polymerization process is preferably continuous and of the free radical type. It is significant that the process affords energy conservation, even though it is adapted to handling higher concentrations of rubbery additives than hitherto found possible.