Acid catalyzed copolymerization of water and epoxy resin and uses thereof
CA 2387070 A1 · Owner: Air Products And Chemicals, Inc. · Inventors: Dickenson, John Bartram; Walker, Frederick Herbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Non-gelled polymeric polyols are prepared by the acid catalyzed copolymerization of epoxy resins and water. When the starting resin is an epoxy resin, derived from bisphenol-A, the resulting product has much lower levels of bisphenol-A, and diglycidyl ether of bisphenol-A (DGEBA) compared to traditional epoxy resins of, comparable molecular weight prepared by the advancement process. The product can, be cured with OH reactive crosslinkers such as amino resins and polyisocyanates to, yield thermosetting coatings with useful properties.
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 May 21, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2024.
- 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.