Ion exchangers modified with mercapto amines
CA 1318331 C · Owner: Bachem, Norbert · Inventors: Bachem, Norbert; Rudolph, Udo; Wulff, Claus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for preparing an anhydrous ion exchanger modified with a mercapto amine which, process comprises drying an acid ion exchanger resin having a total capacity of acid functions of from 0.7 to 2.1 mval/ml of ion exchanger in the water-moist form with a water content of about 75 to 85% by weight or a total capacity of acid functions of from 3.5 to 5 mval or higher when based on 1 g of dry substance of ion exchanger, and thereafter rinsing with the phenol required for preparation of the bisphenol and thereafter neutralizing with at least 0.3 mol of a mercapto amine corresponding to formula (I) per mol of acid function of the ion exchanger at a temperature above …
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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 May 25, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 25, 2010.
- 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.