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US 8,618,332 B2Granted
Process for the preparation of crystalline mixtures of alpha-hydroxycarbonyl derivatives of alpha-methylstyrene dimers
AssigneeLamberti SPA
InventorsGiuseppe Li Bassi, Gabriele Norcini, Leonardo Federici
Life of this patent
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Abstract
Process for the preparation of the powdery crystalline mixtures of alpha-hydroxycarbonyl derivatives of alpha-methylstyrene dinners comprising the use of a solvent having polarity from 0 to 0.1.
Claims15
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.
2 more elements
A composition comprising crystalline mixtures of alpha-hydroxycarbonyl derivatives of dimers of alpha-methylstyrene having purity higher than 95% by weight and containing less than 0.1% of 2-hydroxy-2-methyl-l-phenyl-lpropanone.
Dependencies are inferred from the claim text.