Process for the preparation of polyurethane foams
CA 1338411 C · Owner: Hettel, Hans · Inventors: Haas, Peter; Hettel, Hans; Jacobs, Gundolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the preparation of polyurethane foams comprising reacting polyisocyanates with compounds having a molecular weight of from 400 to 10,000 and containing at least two isocyanate-reactive hydrogen atoms, in the presence of water and/or organic blowing agents, catalysts, melamine as a flameproofing agent and, phosphonic acid ester flameproofing agents selected from the group consisting of compounds having the general formulas , , , wherein R1 ls C1-C6 alkyl, C2-C6 unsaturated aliphatic C5-C12, cycloalkyl, C7-C15 aralkyl, or C6-C12 aryl; R2 and R3 are independently C1-C6 alkyl, C2-C6 unsaturated aliphatic C5-C12, cycloalkyl, C7-C15 aralkyl, or …
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 June 18, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 2013.
- 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.