Heat resistant high impact polymer compositions and method of making same
CA 1197939 A · Owner: Atlantic Richfield Company · Inventors: Triplett, Jacob; Lordi, Frank E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
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 …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 10, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2002.
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Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.