Process for the production of deactivated suspensions of finely-divided polyisocyanates in relatively high molecular weight compounds, deactivated suspensions and use thereof for the production of polyurethanes

US4619985A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Heinrich Hess · Cologne, DE
• Gerhard Grogler · Leverkusen, DE
• Richard Kopp · Cologne, DE
• James-Michael Barnes · Breitscheid, DE

Key dates

• Filing date: May 8, 1985
• Grant date: Oct 28, 1986
• Expiry date: May 8, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S528/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to a process for the production of suspensions of finely-divided polyisocyanates which are obtainable by the surface reaction with from 0.1 to 25 equivalent percent of reactive group per NCO of stabilizers in relatively high molecular weight polyols and/or relatively high molecular weight polyamines having molecular weights from 400 to 6,000 optionally with addition of lower molecular weight polyols and/or aromatic amines having molecular weights of from 60 to 399, which are characterized in that unreacted quantities of stabilizers in the suspension are subsequently partially or completely deactivated by addition of substances having an acylating and/or neutralizing and/or alkylating effect and/or adsorbing effect as "deactivators". In particular, mono- and/or polyisocyanates are used as "deactivators". Deactivated suspensions obtainable in this way do not exhibit rising thickening temperatures during the production of polyurethanes, in particular in large-volume shaped articles. The present invention also relates to deactivated suspensions obtainable by the present process and to the use thereof for polyurethane production.