Polyoxyalkyl amine-polyisocyarate reaction products as coagulation agents for binding agent dispersions

In an aqueous binder dispersion containing a binding agent suitable for use in the production of nonwoven fabrics, a non-ionic and/or an anionic dispersing agent and a coagulation agent, the improvement wherein the coagulation agent is present in an amount of from 0.5 to 50 parts per 100 parts of binder solids and is a polyurethane having a weight average molecular weight of from 500 to 20,000 which is the reaction product of

• (i) a polyoxyalkylated aliphatic amine containing d nitrogen atoms, where d is 1 to 5, and where d is greater than 1, each nitrogen atom is connected with the next by a (C.sub.2-4)alkylene moiety and from d+1 to d+2 polyoxy(C.sub.2-4)alkylene units, with the proviso that the molecule contains C.sub.2 oxyalkylene units and C.sub.3 and/or C.sub.4 oxyalkylene units with the C.sub.3 and/or C.sub.4 units forming the majority of oxyalkylene units, and with the further proviso that when the number of polyoxyalkylene units is d+1, the other group bound to a nitrogen atom is a (C.sub.1-6) alkyl group and
• (ii) from 0.1 mols to 2 mols per mol of (i) but not exceeding the stoichiometric amount of a polyisocyanate,
• which reaction product is optionally in quaternized form.

A coagulation agent which is the reaction product of

• (i) an amine of formula I ##STR11## wherein the sum of x+y+z is 9 to 45 and the sum of a+b+c+p+q+r is 6 to 30 whereby ##EQU4## is 0.6 to 0.9 and each of x, y and z is a whole number .gtoreq.1 and each of a, b, c, p, q and r is a whole number .gtoreq.0, and 0.2 to 1.5 mols of an aliphatic, cycloaliphatic or aromatic diisocyanate.