Process for the production of oligomeric polyisocyanates and their use in the production of polyurethane plastics

US4614785A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Roland Richter · Cologne, DE
• Hanns P. Muller · Leverkusen, DE
• Werner Kubitza · Leverkusen, DE
• Theodor Engbert · Recklinghausen, DE
• Gerhard Mennicken · Leverkusen, DE

Key dates

• Filing date: Aug 14, 1985
• Grant date: Sep 30, 1986
• Expiry date: Aug 14, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/79
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the production of oligomeric polyisocyanates by the dimerization or trimerization of a portion of the isocyanate groups in organic polyisocyanates in the presence of tertiary phosphines or in the presence of a peralkylated phosphorus acid triamides as catalyst, followed by termination of the dimerization and/or trimerization reaction at the required degree of oligomerization by the addition of a catalyst poison, characterized in that a sulfonyl isocyanate is used as the catalyst poison. The present invention also relates to the use of the oligomeric polyisocyanates obtained by this process, optionally in admixture with unreacted starting polyisocyanate or optionally blocked by blocking agents for isocyanate groups, as the polyisocyanate component in the production of polyurethane plastics.