| abstract |
Dispersing agents comprising the adducts of one or more compounds from each of the following classes: n (a) an organic compound containing two or more isocyanate groups, n (b) an organic compound containing two or more groups which are reactive with isocyanate groups, and n (c) a compound of the formula: n n Z--X--E (T--D).sub.n-1 Q n n wherein n Z represents --OH or --NHR, wherein R is alkyl; n X is optionally substituted alkylene; n T is alkylene; n N is a positive integer; n Q is optionally substituted alkyl; and n E is a ##STR1## group wherein R' is hydrogen or alkyl, and D is a ##STR2## group provided that only one of E and D is connected to T via the carbon atom of the carbonyl group present in D and E, and at least one of the group represented by X, T, Q, R and R 1 contains a carbon chain having more than 4 carbon atoms, a process for the manufacture of the said dispersing agents, and their use in the preparation of finely divided dispersions of solids in organic liquids. |