Polymers or copolymers of modified steric composition obtained by the use of a new catalytic composition
CA 1061314 A · Owner: Michelin & Cie (Compangie Generale Des Etablissements Michelin) · Inventors: De Zarauz, Yves
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymers of conjugated dienes and copolymers of conjugated dienes with vinyl aromatic compounds or with other conjugated diene a having a high content of trans-1,4 linkages and a low content of 1,2 or 3,4 linkages and an elastomeric character are prepared by use of a catalytic composition which comprises (a) an organo-lithium initiator and (b) a cocatalyst system comprising a compound of barium or strontium and an organometallic compound of a metal of Group IIB or IIIA of the Mendeleev periodic table of elements.
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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
- Granted August 28, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 28, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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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.