Process for the preparation of isocyanates or isocyanate mixtures useful for the preparation of polyurethane foams

US6140382A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Manfred Gallus · Krefeld, DE
• Herbert Gebauer · Krefeld, DE
• Otto Immel · Krefeld, DE

Key dates

• Filing date: Mar 15, 1993
• Grant date: Oct 31, 2000
• Expiry date: Mar 15, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2101/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Isocyanates or isocyanate mixtures which are substantially free of color-imparting components are made by treating the isocyanate with hydrogen in the presence of a catalyst at a pressure of from about 3 to about 150 bar, a temperature of from about 100 to about 180.degree. C. for from about 15 minutes to about 4 hours. These isocyanates are particularly useful for the preparation of light-colored polyurethane rigid foams.