Preparation of ion-exchange catalysts
CA 1258342 A · Owner: The Dow Chemical Company · Inventors: Fazio, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is a process for preparing an insoluble strong-acid cation-exchange resin in acid form modified by the partial neutralization of its cation- -exchange capacity with aminoalkanethiol. The process is characterized by contacting the cation-exchange resin with an N-(2-mercaptoalkyl)amide in the presence of water under reaction condition sufficient to produce the modified cation-exchange resin. The partially neutralized resin can be treated further by contacting it with an aldehyde or ketone under reaction conditions sufficient to convert the aminoalkanethiol moieties to thiazolidine moieties. These partly neutralized resins are useful as catalysts in the preparation of bisphenols …
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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
- Granted August 8, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 8, 2006.
- 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.