Polyisocyanate compositions having a long shelf life and obtainable by phosgene-free methods, their preparation and their use

US5728317A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Laqua · Mutterstadt, DE
• Franz Merger · Bischofswerda, DE
• Tom Witzel · Ludwigshafen, DE
• Ursula Siebenhaar · Schifferstadt, DE
• David Agar · Rimbach, DE

Key dates

• Filing date: May 13, 1996
• Grant date: Mar 17, 1998
• Expiry date: May 13, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

(Cyclo)aliphatic polyisocyanate compositions which have a long shelf life, are obtainable by phosgene-free methods, preferably by thermal cleavage of (cyclo)aliphatic polycarbamates, and, for stabilization, contain at least one primary stabilizer (2a), preferably a sterically hindered phenol and/or an aromatic amine, or at least one secondary stabilizer (2b), preferably an organic phosphite and/or a thioether, or at least one acidic stabilizer (2c), preferably a carboxylic acid, an acyl chloride, an inorganic acid, an inorganic acid chloride and/or a diester of phosphoric acid, or a stabilizer system comprising at least 2 of the stabilizers (2a) to (2c), a process for the preparation of the (cyclo)aliphatic polyisocyanate compositions and their preferred use for the preparation of isocyanurate-containing polyisocyanates.