Process for the production of cold-setting polyurethane urea elastomers
CA 1311576 C · Owner: Bayer Aktiengesellschaft · Inventors: Hess, Heinrich; Ruckes, Andreas; Grogler, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo-3086, LeA 25,610, A PROCESS FOR THE PRODUCTION OF COLD- SETTING POLYURETHANE UREA ELASTOMERS, ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the production of polyurethane urea elastomers from a) NCO-terminated prepolymers based on polyisocyanates and polyethers having a molecular weight of 400 to about 10,000 and an ethylene oxide content of about 10 to 60 mole-% and, b) solid diaminodiphenyl ureas corresponding to the formula, wherein R1, R2, R3 and R4 may be the same or different and represent hydrogen or C1-C6 alkyl radicals and, wherein the amino groups are in the mand/or p-position to the urea group, characterized in that the NCO prepolymers are reacted …
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
- Granted December 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 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.