Process for the production of isocyanurate polyisocyanates, the compounds obtained by this process and their use

US5076958A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Josef Pedain · Cologne, DE
• Manfred Schonfelder · Leverkusen, DE
• Hans Hofer · Cologne, DE
• Walter Krauss · Starnberg, DE

Key dates

• Filing date: Mar 28, 1989
• Grant date: Dec 31, 1991
• Expiry date: Mar 28, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/8061
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to a process for the production of isocyanurate polyisocyanates by the partial trimerization of the isocyanate groups of aliphatic diisocyanates in the presence of catalysts which accelerate the trimerization of isocyanate groups, termination of the trimerization reaction at the particular degree of trimerization required and removal of unreacted starting diisocyanate and, optionally, other volatile constituents, characterized in that at least one diol containing ester groups and having an average molecular weight of 350 to 950 is added to the reaction mixture at any time before removal of the excess starting diisocyanate in a quantity of 1 to 50% by weight, based on the weight of the diisocyanate used as starting material, the type of reactants and the quantitative ratios between them being selected so that, on completion of the reaction, at least 10% by weight free starting diisocyanate is still present in the reaction mixture, not including any inert solvent used, and the molar ratio of isocyanurate groups to urethane groups in the end products is about 20:1 to 0.2:1. The present invention is also directed to the isocyanurate polyisocyanates obt…