| abstract |
The present invention is directed to a stable dispersion of a polyurea and/or a polyhydrazodicarbonamide in a relatively high molecular weight hydroxyl-group containing material, which dispersion has a solids content of from 5 to 50 percent by weight and which is obtained by reacting (a) an organic di- and/or polyisocyanate with (b) an amine-functional material comprising an addition product of (1) acrylonitrile and (2) a member selected from the group consisting of (i) hydrazine, (ii) aliphatic di- or polyamines containing at least two primary amino groups, (iii) cycloaliphatic di- or polyamines containing at least two primary amino groups, (iv) araliphatic di- or polyamines containing at least two primary amino groups, and (v) mixtures thereof, the ratio of (1) to (2) being at least one mol of (1) per mol of (2) and at most one mol of (1) for each nitrogen atom contained in (2) per mol of (2), the reaction of component (a) and component (b) being conducted at a temperature of from 30 DEG to 170 DEG C., at an equivalent ratio of components (a) to (b) of from 0.8:1 to 1.5:1, and in the presence of (c) a relatively high molecular weight, hydroxyl-group containing material. The invention also relates to the production and use of such dispersions. |