Intumescent compositions obtained by reacting polyisocyanates with phosphorus-containing products, polyesters and cyanuric acid and/or cyanuric acid derivatives

Abstract

The present invention relates to intumescent compositions, which may be foamed, and which are obtained by reacting: (1) polyisocyanates with (2) phosphorus-containing condensation products having at least one hydroxyl group obtainable by condensing (i) primary or secondary aliphatic, cycloaliphatic, aromatic, araliphatic or heterocyclic monoamines and/or polyamines, which mono- or polyamines may contain OH-groups; (ii) carbonyl compounds; and, (iii) dialkyl phosphites, and (3) polyesters containing hydroxyl groups and having OH-numbers of from 140 to 300, obtained by reacting polycarboxylic acids containing from 2 to 10 carbon atoms with at least 2 polyols selected from two different groups of the following three: (a) hydroxyl compounds containing more than three OH groups and having molecular weights of up to 200, (b) hydroxyl compounds containing three OH groups and having molecular weights of up to 150, (c) hydroxyl compounds containing two OH-groups and having molecular weights of up to 80, with the proviso that at least one polyol is selected from group (a), and (4) cyanuric acid and/or cyanuric acid derivatives and (5) optionally water and/or other organic compounds containing isocyanate-reactive hydrogen atoms.

Dependencies are inferred from the claim text.