Modified aromatic polyisocyanates and their use for the production of rigid foamed materials

US5424386A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Herbert Gebauer · Krefeld, DE
• Pramod Gupta · Bedburg, DE
• Christian König · Echterdingen, DE

Key dates

• Filing date: Mar 31, 1993
• Grant date: Jun 13, 1995
• Expiry date: Mar 31, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2115/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyaromatic polyisocyanates are modified by reaction with 0.1 to 10 weight %, preferably 2 to 7 weight % (based on polyisocyanate) of a polyether alcohol of molecular weight 206 to 948, obtainable by the reaction of alkylene oxides with C.sub.6 -C.sub.30, preferably C.sub.8 -C.sub.20, hydrocarbons containing 1 to 3 active H atoms, and are used for the production of rigid polyurethane foamed materials.