The paper presents the results of investigations on the production of allyl ethers of phenolphthalein-containing novolacs, curable without release of low molecular weight substances, and cross-linked copolymers based on them.
Phthalide-containing diphenol 3-phenyl-3-(21,51-dihydroxyphenyl)phthalide was synthesised for the first time by the interaction of o-benzoylbenzoic acid chloride with hydroquinone in a dioxane solution in the presence of catalyst ZnCl2. Interaction of a mixture of the synthesised diphenol and phenol in different weight ratios (from 5:95 to 50:50) with formaldehyde in the presence of catalytic quantities of ammonia produced phenol–formaldehyde cooligomers of the resol resin type and heat-resistant crosslinked polymers based on them.
By the interaction of formaldehyde with mixtures of phenol, phenolphthalein, and phthalimidine-containing bisphenols in the presence of an acidic catalyst, new co-oligophenol formaldehyde novolacs and crosslinked copolymers based on them are produced. Their properties are studied.
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