Process for the production of blocked polyisocyanates containing carbodiimide groups, the polyisocyanates obtainable by this process and their use for the production of plastics

US5126479A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Willi Dunwald · Leverkusen, DE
• Reinhard Halpaap · Odenthal, DE
• Josef Pedain · Cologne, DE

Key dates

• Filing date: May 15, 1989
• Grant date: Jun 30, 1992
• Expiry date: May 15, 2009

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01B3/302
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the production of organic compounds containing (i) carbodiimide and/or uretone imine groups and (ii) blocked isocyanate groups, wherein about 10 to 90% of the isocyanate groups of an organic polyisocyanate are blocked by reaction with a monofunctional blocking agent for isocyanate groups, and subsequently about 65 to 100% of the free isocyanate groups still remaining are converted into carbodiimide groups with elimination of the carbodiimide. The present invention also relates to the organic compounds obtainable by this process and to their use for the production of plastics by reaction with compounds containing isocyanate-reactive groups by the isocyanate polyaddition process.