Polyisocyanate mixtures, process for their production and their use in the production of polyurethane plastics

US4456709A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Roland Richter · Cologne, DE
• Hans Hettel · Cologne, DE
• Hanns P. Muller · Leverkusen, DE

Key dates

• Filing date: Nov 23, 1983
• Grant date: Jun 26, 1984
• Expiry date: Nov 23, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to polyisocyanate mixtures which are liquid and stable in storage at room temperature and which have an NCO-content of from 36.5 to 45% by weight, consisting essentially of a mixture of from 25 to 70 parts by weight of partly trimerized 2,4-diisocyanatotoluene with from 30 to 75 parts by weight of unmodified 2,4-and/or 2,6-diisocyanatotoluene, a process for the production of these mixtures by mixing the individual components and the use of the mixtures as a synthesis component in the production of polyurethane plastics by the isocyanate-polyaddition process.