Process for the preparation of polyglycidyl ethers of...

Details Process for the preparation of polyglycidyl ethers of... Process for the preparation of polyglycidyl ethers of...

C - Chemistry, Metallurgy

07

D

260/370.8

C07D 303/30 (2006.01) C07D 303/24 (2006.01)

Patent

CA 1144933

A B S T R A C T PROCESS FOR THE PREPARATION OF POLYGLYCIDYL ETHERS OF POLYDYDRIC PHENOLS Liquid polyglycidy]. ethers of polyhydric phenols are prepared by (A) reacting the polyhydric phenol and an excess of eplchlorohydrin in the presence of a condensation catalyst with formatlon of chlorohydrin ethers by addition reactions and glycidyl ethers and dichlorohydrin by trans- epoxidation reactions, until at least 95% of the phenolic groups have reacted, (B) distilling off epichlorohydrin and dichlorohydrin, with addition of supplementary dichloro- hydrin, at temperatures at which glycidyl ethers are reconverted into chlorohydrin ethers by reaction with di- chlorohydrin, (C) dissolving the residue after removal of volatile components in organic solvent and dehydrohalogen- ating with aqueous alkali metal hydroxide with separation of the aqueous alkali chloride solution, and isolating the polyglycidyl ether.

348636

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