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AssigneeBayer Aktiengesellschaft
InventorsGerhard Grogler, Richard Kopp, Heinrich Hess, Werner Rasshofer
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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.
A process for the production of solid polyamines stabilized by a polyadduct covering and showing retarded reactivity comprising reacting
Stabilized, solid, finely divided polyamines with retarded activity which have a polyadduct covering prepared by partial surface reaction with water-insoluble, difunctional and/or higher functional polyisocyanates, which polyamines have a residual amino group content of from at least 75% to less than 99.9% of the amino groups originally present in the unstabilized polyamine, suspended in relatively high molecular weight polyhydroxyl compounds having molecular weights of from 62 to 10,000 and/or relatively high molecular weight polyamino compounds having molecular weights of from 32 to 10,000.
Dependencies are inferred from the claim text.