| 摘要 |
Glycidyl ethers are prepared from epichlorhydrin or dichlorhydrin reacted in alkaline medium with phenols prepared by reacting (A) a phenol with at least one free phenolic hydroxy group and at least one reactive nuclear hydrogen atom with (B) a polymerizable aromatic substance containing at least one vinyl radicle attached to a benzene nucleus. The reaction between A and B is catalysed by sulphuric, hydrochloric or toluene sulphonic acid or a Friedel-Crafts catalyst. Phenols mentioned are phenol, cresol, resorcinol diphenylopropane and the condensate from o-cresol and acetone. Vinyl compounds specified are styrene, a -methyl styrene, parachlorstyrene, vinyltoluene or divinylbenzene. For thermosetting products, which are preferred, a monohydric phenol must be reacted with a compound containing at least two vinyl groups. With a polyhydric phenol thermosetting products are obtainable with a monovinyl compound. Conventional hardening agents, e.g. phthalic anhydride or triethylene tetramine are used for curing the thermosetting products. Examples describe preparation and curing of glycidyl ethers from the reaction products of (1) diphenylolpropane with styrene; (2) the condensate of o-cresol with acetone, and styrene; (3) and (4) resorcinol and a mixture containing 55 per cent of divinyl benzene, with ethyl vinyl benzene and diethyl benzene; (5) 4,41 dihydroxydiphenylpropane and the mixture of examples (3) and (4); (6) o-cresol and divinyl benzene. |
