Process for coating substrates with polyurethane ureas
CA 1333140 C · Owner: Thoma, Wilhelm · Inventors: Thoma, Wilhelm; Pedain, Josef; Kling, Waldemar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for coating substrates with polyurethane ureas which is characterized in that a substrate is coated with a product, which has been obtained by the reaction of A) a prepolymer based on an aromatic polyisocyanate containing on average two ketoxime-blocked NCO groups and having an average molecular weight of about 500 to 15,000 with B) a chain-extending agent corresponding to the formula, H2N-R'-NH2, in which R' is an aliphatic or cycloaliphatic radical in the presence of solvents at temperatures above 50°C and at an equivalent ratio of blocked NCO groups to NH2 groups of 1.43 to 1.02, wherein after about 40 to 90% of the available amino groups …
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 November 22, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 22, 2011.
- 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.