Process for the production of stabilized polyisocyanates, the polyisocyanates so-stabilized and their use in the production of polyurethanes

US4483974A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerhard Grogler · Leverkusen, DE
• Heinrich Hess · Cologne, DE
• Richard Kopp · Cologne, DE

Key dates

• Filing date: Jul 18, 1983
• Grant date: Nov 20, 1984
• Expiry date: Jul 18, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2991
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of solid polyisocyanates stabilized by a polymer coating and showing retarded reactivity comprising reacting PA1 (1) one or more solid polyisocyanates in particulate form, said polyisocyanates having melting points above 30.degree. C., and PA1 (2) from 0.1 to 25 equivalent percent of amine per isocyanate equivalent of an organic compound having a molecular weight of from 32 to 6000, said organic compound being selected from the group consisting of PA2 (a) di- or higher functional compounds containing 2 or more aliphatically-bound primary and/or secondary amino groups, PA2 (b) compounds containing one or more terminal --CO--, --NH--, --NH.sub.2 -- groups, PA2 (c) hydrazines, and PA2 (d) mixtures thereof said reaction being conducted at a temperature below the melting temperature of said solid polyisocyanate, and being conducted in the presence of PA1 (3) a liquid medium selected from the group consisting of PA2 (a) organic compounds containing one or more hydroxy groups and having molecular weights of from 62 to 6000, PA2 (b) organic compounds containing 2 or more aromatically-bound amino groups and having molecular weights of from 108 to 6000, PA2 (c) o…