| 摘要 |
Liquid polyglycidyl ethers of polyhydric phenols are prepared by (A) reacting the polyhydric phenol and an excess of epichlorohydrin in the presence of a condensation catalyst with formation of chlorohydrin ethers by addition reactions and glycidyl ethers and dichlorohydrin by transepoxidation reactions, until at least 95% of the phenolic groups have reacted, (B) distilling off epichlorohydrin and dichlorohydrin, with addition of supplementary dichlorohydrin, at temperatures at which glycidyl ethers are reconverted into chlorohydrin ethers by reaction with dichlorohydrin, (C) dissolving the residue after removal of volatile components in organic solvent and dehydrohalogenating with aqueous alkali metal hydroxide with separation of the aqueous alkali chloride solution, and isolating the polyglycidyl ether. |
