Process for the preparation of polyisocyanates containing isocyanurate groups and their use in the production of polyurethanes

US4379905A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ingo Stemmler · Odenthal, DE
• Hanns P. Muller · Leverkusen, DE
• Kuno Wagner · Leverkusen, DE

Key dates

• Filing date: Jan 6, 1982
• Grant date: Apr 12, 1983
• Expiry date: Jan 6, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/791
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The subject of the invention is a process for the preparation of polyisocyanates containing isocyanurate groups which comprises trimerizing a proportion of the isocyanate groups of organic polyisocyanates or mixtures of di- and monoisocyanates in the presence of basic alkali metal compounds as catalysts and terminating the trimerization reaction by the addition of a catalyst poison, characterized in that the trimerization catalysts are complexes of PA0 (i) basic alkalimetal compounds and PA0 (ii) acyclic organic compounds which PA1 (a) have at least 6 alkylene oxide units of the formula --R--O--, wherein R represents C.sub.1 -C.sub.4 -alkylene, in the form of one or more polyether chains with only those chains having at least three alkylene oxide units being counted to achieve the total of at least 6 alkylene oxide units PA1 (b) contain a total of at least about 40% by weight of alkylene oxide units, the alkylene oxide units of any chains containing less than three of these units not being counted as alkylene oxide units, and PA1 (c) have a molecular weight of at least about 282. The invention also relates to the use of the process products according to the invention, optionally fr…