Polyester polyols and the use of polyester polyols for producing pur cast elastomers that have an improved resistance to hydrolysis
CA 2401833 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Hoffmann, Andreas; Schneider, Michael; Barnes, James-Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to polyester polyols having an average equivalent weight ranging from 200 to 4000, which are produced by reacting .alpha..omega.dicarboxylic acids with 1,4-butanediol 1,6-hexanediol, 1,3-propanediol or 1,5pentanediol as well as with polyols having 3 to 6 hydroxyl groups. The inventive polyester polyols are used to produce PUR cast elastomers that have an improved resistance to hydrolysis.
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 February 19, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 19, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2023.
- 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.