Production of fine particle dye or drug preparations

US5700471A · kind A · utility

Assignee

• BASF SE

Inventors

• Lutz End · Mannheim, DE
• Dieter Horn · Heidelberg, DE
• Erik Lueddecke · Mutterstadt, DE

Key dates

• Filing date: Dec 18, 1995
• Grant date: Dec 23, 1997
• Expiry date: Dec 18, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K23/00
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Process for the production of fine-particle, essentially amorphous dye or drug preparations by converting a relatively coarse-particle dispersion or a solution into a colloidal dispersion in water, where the colloidal dispersion is generated at a temperature above the melting point of the dye or drug by admixing appropriately hot water (where appropriate under pressure) or an aqueous protective colloid solution so that an emulsion of a melt in aqueous medium is produced and is immediately spray-dried or converted by cooling into a suspension.