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摘要

Described is a flame-retardant (low-flammability) carpet (floor covering) consisting of a backing material (1), a tied-in pile yarn (2) and a back finish (3), wherein the pile yarn consists of low flammability synthetic fibres, the backing material consists of normal or low flammability synthetic fibres and the back finish consists of a polyurethane composed of the radicals of the formulae I to VII: where A1 is an aliphatic radical having from 2 to 12, preferably 4-10, in particular 4-8, carbon atoms, A2 is a phenyl radical, preferably an o-, m- or p-phenyl radical, A3 is an aliphatic radical having 2-10, preferably 4-8, carbon atoms, with n and m each being 1 or 2 and n+m being 3 or 4, preferably 3, and each of the n oxygen atoms being attached to A3, B1 is an aliphatic or cycloaliphatic radical having 2-10, preferably 4-8, carbon atoms, B2 is an aliphatic or cycloaliphatic radical having 3-6 carbon atoms, preferably an aliphatic radical having 3 or 4 carbon atoms with p being 1 or 2 and each of the p oxygen atoms being attached to B2, C1 is an aliphatic or mono- or bicyclic cycloaliphatic radical having from 2 to 12 carbon atoms, preferably 5-12 carbon atoms, and D1 is an aliphatic or mono- or bicyclic cycloaliphatic radical having from 5 to 36 carbon atoms, preferably 6-20, in particular 10-16, carbon atoms, the proportions of the radicals I to III, based on their total amount, are within the following limits: I: 40 to 80 mol%, II: 10 to 40 mol%, III: 0 to 25 mol%, the proportions of the radicals IV, V and VI, based on their total amount, are within the following limits: IV: 65 to 95 mol%, V: 0 to 19 mol%, VI: 3 to 16 mol%, the radicals of the formulae I, II and IV form polyester blocks having an average molecular weight from 400 to 6000, and the proportions of the radicals of the formula VII, based on the total amount of all the components of the polyurethane resin, are from 5 to 35 mol%, preferably from 10 to 25 mol%, and a process for producing the flame-retardant carpet. There is further described an aqueous preparation containing this polyurethane resin and its use for textile finishing.