A process for conditioning and stabilizing polyols
CA 2111286 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Reiff, Helmut; Quiring, Bernd; Scholl, Hans J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polyols are conditioned and stabilized by mixing them at 0 to 150°C with from about 0.0001 to about 1% by weight based on the quantity of, polyol, of a silylated acid corresponding to the formula: X-Si(CH3)3n, in which, X represents a neutral acid residue obtained by removal of the acidic hydrogen atoms from an n-basic acid having a maximum pKa value of 3, provided that the n-basic acid is not a hydrohalic acid and n represents an integer of from 1 to 3. The resultant polyol is characterized by good color and activity properties. The stabilized polyols are particularly useful in the production of polyurethanes, particularly polyurethane foams.
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 December 13, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 13, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2015.
- 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.