摘要:
A process for making glycidyl ethers of novolac resins, particularly phenol or cresol novolacs, with low hydrolyzable chlorine and low ionic chloride content, said resins prepared by reaction of a novolac resin with epichlorohydrin in an alkaline medium, comprises dissolving the crude epoxy novolac resin in an inert organic solvent, treating the solution obtained with an excess amount of an alkali metal alkoxide, neutralizing the excess alkali with a weak acid, removing the alkali metal chloride formed by filtration in the presence of a filter aid and isolating the epoxy novolac resin by distillation of the solvent.
摘要:
An improved process for making glycidyl ethers of novolac resins, particularly cresol and phenol novolacs, by reaction of the novolac with a solid alkali metal hydroxide in excess epichlorohydrin and in the presence of an alcohol cosolvent where the reaction mixture contains a small amount of water, wherein the improvement comprises carrying out the etherification and dehydrochlorination in a combined one step process, in the absence of a catalyst specific for chlorohydrin formation, and using the solid alkali metal hydroxide in the form of tiny beads.