Process for the production of heat-resistant polyurethane urea elastomers
CA 1311575 C · Owner: Grogler, Gerhard · Inventors: Hess, Heinrich; Grogler, Gerhard; Ruckes, Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo-3078, LeA 25,609, A PROCESS FOR THE PRODUCTION OF HEAT-RESISTANT POLYURETHANE UREA ELASTOMERS ABSTRACT OF THE INVENTION, The present invention is directed to a process for the production of a polyurethane urea elastomer which comprises preparing a heterogeneous mixture of a) a diaminodiphenylurea corresponding to the formula, wherein R1, R2, R3 and R4, which may be the same or different, represent hydrogen or a C1-C6 alkyl radical and, wherein the amino groups are in the meta and/or para position to the urea group and, b) an NCO-terminated prepolymer prepared from a polyisocyanate and a polyhydroxyl, compound having a molecular weight of 400 to about 10,000, and, subsequently reacting …
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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 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
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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.