PROCESS FOR THE PREPARATION OF STABILIZED POLYAMINES, STABILIZED POLYAMINES WITH RETARDED REACTIVITY AND THEIR USE FOR POLYURETHANE PRODUCTION

摘要

PROCESS FOR THE PREPARATION OF STABILIZED POLYAMINES, STABILIZED POLYAMINES WITH RETARDED REACTIVITY AND THEIR USE FOR POLYURETHANE PRODUCTION This invention relates to a process for the production of solid polyamines stabilized by a polyadduct covering and showing retarded reactivity comprising reacting (1) one or more solid organic polyamines in particulate form, said polyamines containing at least two primary and/or secondary amino groups and having melting points above 50.degree.C, and (2) from 0.1 to 25 equivalent % of isocyanate per amine equivalent of a water insoluble, difunctional and/or higher functional polyisocyanate, said reaction being conducted at a temperature below the melting point of said solid polyamine, and being conducted in the presence of (3) a liquid medium selected from the group consisting of (a) organic compounds containing two or more hydroxy groups and having molecular weights of from 62 to 10, 000, (b) plasticizers, (c) water, and (d) mixtures thereof to form a suspension of polyadduct-covered stabilized polyamines in the liquid medium.