Method for reducing the chlorine content of low molecular weight isocyanates

US6391161B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karsten Danielmeier · Solingen, DE
• Dieter Mager · Leverkusen, DE
• Reinhard Halpaap · Odenthal, DE
• Martin Brahm · Siegen, DE
• Eric Hoffman · Pittsburgh, US

Key dates

• Filing date: Mar 22, 2000
• Grant date: May 21, 2002
• Expiry date: Mar 22, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/11
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An organic isocyanate or mixture of isocyanates is treated with at least one high molecular weight ester of phosphoric acid corresponding to a specified formula to remove chlorine compounds. The isocyanates which are purified in this manner are useful for the production of coatings, polyurethane moldings and chemical intermediates.