Decoloration of polyisocyanates containing isocyanurate and diretdione groups

US5919887A · kind A · utility

Assignee

• BASF SE

Inventors

• Hermann Graf · Berlin, DE
• Ernst Deuker · Ludwigshafen, DE
• Stefan Wolff · Sunnyvale, US
• Ludwig Schuster · Schifferstadt, DE
• Serge Wack · Ludwigshafen, DE
• Richard Hardt · Bischofswerda, DE

Key dates

• Filing date: May 19, 1997
• Grant date: Jul 6, 1999
• Expiry date: May 19, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/798
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for decoloring polyisocyanates containing isocyanurate and uretdione groups comprises treating the demonomerized polyisocyanates containing isocyanurate and uretdione groups with oxygen.