Polyether esters as flame retardants for polyurethane flexible foams
CA 2491978 C · Owner: Dreier, Thorsten · Inventors: Roers, Rolf; Meyer-Ahrens, Sven; Dreier, Thorsten
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Flexible polyurethane foams that satisfy the requirements of FMVSS 302 are produced by reacting a polyisocyanate with a polyol component that includes: (1) from 90 to 99 parts by weight of a polyether polyol having an OH value of from 20 to 200 mg KOH/g and functionality of from 2 to 4 and (2) from 1 to 10 parts by weight of a polyether ester polyol having an OH value of from 150 to 450 mg KOH/g and a functionality of from 2 to 3 in the presence of a blowing agent, catalyst and stabilizer. The foams thus produced are useful as cushioning , for furniture and automotive 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
- Filed January 7, 2005 and granted May 1, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.