Process for the preparation of flame resistant, elastic polyurethane flexible foams and low viscosity melamine polyether polyol dispersions therefor
CA 2006697 A1 · Owner: Leppkes, Reinhard · Inventors: Genz, Manfred; Ramlow, Gerhard; Leppkes, Reinhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention deals with a process for the preparation of flame resistant, elastic polyurethane flexible foams comprising, reacting:, a) organic and/or modified organic polyisocyanate; with b) higher molecular weight polyols; and c) 1,6-hexanediol and/or trimethylolpropane; in the presence of, d) melamine or mixtures of melamine and other flame retardants; e) at least one blowing agent; and, f) at least one catalyst; and optionally g) auxiliaries and/or additives. -66-, In addition the present invention deals with suitable low viscosity melamine and polyetherpolyol dispersions for the process of the present invention comprising melamine 1,6-, hexanediol and/or trimethylolpropane and …
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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
- Filed December 27, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 27, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 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
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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.