Preparation of epoxy resins having low undesirable halogen content
CA 1284696 C · Owner: Wang, Chun S. · Inventors: Liao, Zeng-Kun; Wang, Chun S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of glycidyl derivatives of compounds containing one or more -OH NH2 or -COOH group per, molecule, which process comprises reacting at least one compound having one or more -OH, -NH2 or -COOH group per molecule with an excess of at least one epihalohydrin in the presence of an alkali metal hydroxide and an organic solvent and continuously removing water from the reaction mixture by codistilling or azeotroping with the eiphalohydrin and solvent; characterized by conducting the reaction in the presence of a mixture of solvents which codistill with the water and epihalohydrin at least one of which, solvents is a polar aprotic solvent and wherein the amount of polar …
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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 June 4, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 4, 2008.
- 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.