Process for the preparation of an olefin polymer using metallocenes having specifically substituted indenyl ligands
CA 2080576 A1 · Owner: Antberg, Martin · Inventors: Antberg, Martin; Winter, Andreas; Rohrmann, Juergen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure: Process for the preparation of an olefin polymer using metallocenes having specifically substituted indenyl liqands, A very active catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane and a, metallocene of the formula I or Ia (I) , (Ia), in which, preferably, M1 is Zr or Hf R1 and R2 are alkyl, or halogen, R3 and R4 are hydrogen or alkyl R5 and R6 are, alkyl, -(CR8R9)m-R7-(CR8R9)n is a chain with one or more members, in which R7 can also be a (substituted) heteroatom, and m+n is zero or 1.
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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 October 14, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 14, 2014.
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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.