Patent ID: 8618332
Filing Date: 2013-12-31
Classification: C07C,C08F,G03F

Abstract:
1. A process for preparation of powdery crystalline mixtures of alphahydroxycarbonyl derivatives of alpha-methylstyrene dimers comprising: dissolving a mixture of alpha-hydroxycarbonyl derivatives of oligomers of alpha-methylstyrene in a solvent having a polarity of from about 0.1 to about 0.7, at a ratio of solvent to mixture of alphahydroxycarbonyl derivatives of oligomers of alpha-methylstyrene of from about 0.2 to about 4; maintaining the mixture of alpha-hydroxycarbonyl derivatives of oligomers of alpha -methylstyrene in the solvent at a temperature no higher than about 40° C. for from about 10 to about 120 hours; collecting by filtration a solid precipitate and washing it with at least 1 part by weight of a solvent having polarity from about 0 to about 0.1; and removing the solvent.