Method for producing specific crystalline modifications of polmorphous substances

US7211697B2 · kind B2 · utility

Assignee

• BAYER CROPSCIENCE AKTIENGESELLSCHAFT · DE

Inventors

• Axel Eble
• Wolfram Sirges · Düsseldorf, DE
• Ulrich Schwiedop · Monheim, DE
• Armin Heyn · Wittlich, DE

Key dates

• Filing date: May 23, 2003
• Grant date: May 1, 2007
• Expiry date: May 24, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention pertains to a process for the production of a specific crystal modification of a polymorphic, organic substance by precipitation of the specific crystal modification from the aqueous solution of the salt of the polymorphic substances using ordinary water-soluble organic solvents as additives as well as an acid or base.