Preparation of finely divided pulverulent carotinoid and retinoid compositions

US4522743A · kind A · utility

Assignee

• BASF SE

Inventors

• Dieter Horn · Heidelberg, DE
• Hans-Werner Schmidt · Bayreuth, DE
• Walter Ditter · Heidelberg, DE
• Horst Hartmann · Dresden, DE
• Erik Lueddecke · Mutterstadt, DE
• Klaus Schmieder · Schortens, DE

Key dates

• Filing date: May 10, 1982
• Grant date: Jun 11, 1985
• Expiry date: May 10, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B61/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Finely divided, pulverulent carotinoid or retinoid compositions, in which the carotinoid or retinoid essentially has a particle size of less than 0.5 micron, are prepared by a process wherein a carotinoid or retinoid is dissolved in a volatile, water-miscible, organic solvent at from 50.degree. C. to 200.degree. C., if necessary under superatmospheric pressure, within the space of less than 10 seconds. The carotinoid is immediately precipitated, in a colloidally disperse form, from the molecularly disperse solution by rapidly mixing the latter with an aqueous solution of a swellable colloid at from 0.degree. C. to 50.degree. C., and the resulting dispersion is freed from the solvent and the dispersing medium in a conventional manner.