Process for the production of polyurethanes and a storable intermediate product for carrying out this process
CA 1190694 A · Owner: Bayer Aktiengesellschaft · Inventors: Paul, Reiner; Kopp, Richard; Rasshofer, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Optionally-foamed polyurethanes are produced by reacting polyisocyanates with organic compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight in the range from 400 to 10,000, in the presence of activators corresponding to the general formula, wherein R1, R2, R3, and R4 may be the same or different and represent C1-C20-alkyl, C5-C7-cycloalkyl C6-C14-aryl or C7-C30-alkaryl, X and X2 may be the same or different and represent halogen or a radical of the formula -OR5 -SR6 or, with the proviso that X1 and X2 cannot both represent a halogen atom, R5, R6, and R7 may be the same or different and represent a C1-C20-alkyl, C5-C7-cycloalkyl C6-C14-aryl or …
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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 July 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 2002.
- 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.