A process for the preparation of perfluoropolyethers acyl-fluoride ended by reduction of the corresponding peroxidic perfluoropolyethers
CA 2435911 C · Owner: Tonelli, Claudio · Inventors: Di Meo, Antonella; Picozzi, Rosaldo; Tonelli, Claudio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of perfluoropolyethers of for- mula: T-CFX'-O-R f-CFX-COF (I) wherein: T = COF F, C1-C3 perfluoroalkyl; X, X' = -F, -CF3; R f = -(C2F4O)m(CF2CF(CF3)O)n(CF2O)p(CF(CF3)O)q- the sum n+m+p+q ranges from 2 to 200, by reduction with hydrogen of the corresponding peroxidic perfluoropolyethers in the presence of a catalyst formed by metals of the VIII group supported on metal fluorides at a temperture from 20°C to 140°C, and at a pressure between 1 and 50 atm.
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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 24, 2003 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2025.
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