Process for the preparation of aliphatic polycarbonates
CA 1303286 C · Owner: Bayer Aktiengesellschaft · Inventors: Hullmann, Michael; Buysch, Hans-Josef; Bomer, Bruno
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of aliphatic polycarbonates Abstract, Process for the preparation of aliphatic polycarbonates by polymerizing cyclic aliphatic carbonates in the presence of initiators and/or catalysts in which the, initiators used are alkoxysilanes of the formula I, in which, R1, R2 and R3 independently of one another represent a C1-C4-alkyl radical, n is an integer from 1 to 6 and R4 denotes an n-valent, optionally substituted aliphatic hydrocarbon radical, and the catalysts used are the nucleophilic catalysts which are known from group transfer polymerization. Le A 25 268-Foreign countries
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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 June 9, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 2009.
- 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.