Use of polyhydroxyalkyl mono-urea for polyurethane foams, dispersions of the polyhydroxyalkyl mono-urea in polyols and tris-hydroxyalkyl mono-urea

摘要

The invention relates to 1. the use of mono- to tetra-hydroxylalkyl-mono-ureas of the general formula (HO-A ‶ n ', H2-n, N-? -NH2-n- (A-OH) n in which A is a C2-C6-alkyl group which may have OH groups.n = 0, 1 or 2 n '= 1 or 2 and where n + n' = 1,2,3 or 4, preferably 2-4, particularly preferably 3, is, as a built-in flame retardant in amounts of 3-100, preferably 11.5-50 parts by weight, based on 100 parts of higher molecular weight compounds with molecular weights of 400-10,000, for the production of flame-retardant PU foams, preferably integral or semi-rigid foams 2. Dispersions or suspensions of mono- to tetrapoly-hydroxyalkyl-mono-ureas of the above formula in high molecular weight compounds with hydroxyl, primary or secondary amino, carboxyl or hydrazide end groups, preferably in high molecular weight polyols, of the molecular weight range 400-10000, the content of poly-hydroxyalkyl urea is 4 to 50% by weight. 3.Tris-hydroxyalkyl-mono-ureas of the above formula, in which n = 2, n '= 1 and the sum of n + n' = 3.