Thermoplastic copolymer, method for production thereof, and thermoplastic resin composition containing the copolymer
CA 2033320 C · Owner: Hajime, Nishihara · Inventors: Hajime, Nishihara; Katsuaki, Maeda; Akihiro, Watanabe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a thermoplastic terpolymer excelling in thermal stability and transparency and possessing high mechanical strength, specifically a thermoplastic copolymer (I) composed of 30 to 70% by weight of (A) an aromatic vinyl compound unit, 4 to 40% by weight of (B) a vinyl cyanide unit and 26 to 50% by weight of (C) an N-substituted maleimide and characterized by having a narrow distribution of molecular weight divisions of copolymer composition as measured by GPC having, substantially no acetone-insoluble content possessing a weight, average molecular weight in the range of 100,000 to 300,000 and a number average molecular weight in the range of 50,000 to 150,000 and …
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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
- Filed May 30, 1990 and granted November 19, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 2012.
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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.