Process for the production of uretdione group-containing compounds, the compounds obtained according to this process and the use thereof in the production of polyurethane plastics material

US4929724A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Theodor Engbert · Recklinghausen, DE
• Jurg Frohlich · Burscheid, DE
• Werner Kubitza · Leverkusen, DE
• Peter Breidenbach · Baytown, US
• Gerhard Mennicken · Leverkusen, DE

Key dates

• Filing date: Oct 3, 1985
• Grant date: May 29, 1990
• Expiry date: Oct 3, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/798
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention is directed to a process for the production of uretdione group-containing compounds by dimerizing at least a part of the isocyanate groups of organic isocyanates in the presence of compounds containing phosphorus-nitrogen bonds as dimerization catalysts, characterized in that the reaction is carried out in the presence, as co-catalysts, of H-active organic compounds having a pKa-value of at least 6, which have at least one hydrogen atom bound to oxygen, sulphur or nitrogen. The invention also relates to the uretdione group-containing compounds obtained according to this process and to their use for the production of plastics materials according to the isocyanate-polyaddition process.