Process for the preparation of foams characterized by isocyanurate and urethane linkages
CA 1086448 A · Owner: Basf Wyandotte Corporation · Inventors: Narayan, Thirumurti
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract Of The Invention Foams characterized by isocyanurate and urethane linkages are prepared by condensing: (a) an organic poly-isocyanate with a polyol or (b) a quasi-prepolymer in the presence of a blowing agent and a catalytically effective amount of an alkali metal salt of an organic sulfinic acid. The catalysts of the invention offer the advantages of longer cream times and fully cured foams in acceptable times thus finding particular utility in pour-in-place and slab stock foaming applications.
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 September 23, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 1997.
- 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.