Propylene polymer, propylene block copolymer, process for preparing said polymer and said block copolymer, and propylene polymer composition
CA 2100999 C · Owner: Shinozaki, Tetsunori · Inventors: Shinozaki, Tetsunori; Kioka, Mamoru; Kawakita, Kazumitsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are a propylene polymer having a high crystallinity of a boiled heptane-insoluble component contained therein, a high stereoregularity and an extremely long mesochain (continuous propylene units wherein directions of .alpha.-methyl carbons are the same as each other) and a process for preparing said polymer. Also disclosed are a propylene block copolymer containing a crystalline polypropylene portion having a high crystallinity of a boiled heptane-insoluble component contained therein a, high stereoregularity and an extremely long mesochain and, a process for preparing said copolymer. Further disclosed is a propylene polymer composition comprising the above propylene polymer or …
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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 July 21, 1993 and granted June 17, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2015.
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