Process for reducing the total halide content of an epoxy resin
CA 1257446 A · Owner: The Dow Chemical Company · Inventors: Chen, Wuu N.; Wang, Chun S.; Bowden, Robert L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The total halide content of epoxy resins is reduced by heating a resin containing halide dissolved in a unique solvent system containing at least one ketone, at least one aromatic hydrocarbon and at least one compound containing at least one aliphatic hydroxyl group in the presence of an alkali metal hydroxide for a time sufficient to reduce the total halide content; washing the resin with water, a dilute aqueous solution of a weak inorganic acid or acid salt; and then recovering the resultant resin. The epoxy resin having a low halide content is used in the electronics industry as an encapsulant potting, compound electrical laminate, and the like.
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
- Granted July 11, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 11, 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.