Novel initiator systems containing vanadium for the (co)polymerisation of isoolefins
CA 2209651 A1 · Owner: Bohnenpoll, Martin · Inventors: Bohnenpoll, Martin; Langstein, Gerhard; Plesch, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an initiator system for the polymerisation of isoolefins having 4 to 16 carbon atoms, optionally with monomers polymerisable with iso-olefins, the system consisting of or one or more aromatic or heteroaromatic,poly-cyclic hydrocarbons and an aged organic solution of vanadium tetrachloride wherein the concentration of the vanadium tetrachloride is 0.01 mmol to 500 mmol per litre of solvent and the molar ratio of aged vanadium tetrachlorideto polycyclic hydrocarbons is in the range from 100:1 to 1:100. It is possible by means of the initiator system according to the invention to produce polyisoolefins, in particular butyl rubbers at relatively high temperatures, with …
Read the whole patent
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 4, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
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.