Dispersing agents, their use and solids coated therewith

Dispersing agents or salts, thereof, comprising:

• the reaction product of
• A. one or more polyisocyanates having an average functionality of from 2.0 to 5, with
• B a mixture of
• B.sub.1 at least one monohydroxyl compounds selected from the group consisting of monohydroxyl compounds with an aliphatic hydrocarbon, monohydroxyl compounds with an aliphatic hydrocarbon substituted with aryl groups, monohydroxyl compounds with an aliphatic hydrocarbon substituted with halogen groups, monohydroxyl compounds with a cycloaliphatic hydrocarbon, monohydroxyl compounds with a cycloaliphatic hydrocarbon substituted with aryl groups, and monohydroxyl compounds with a cycloaliphatic hydrocarbon substituted with halogen groups, and
• B.sub.2 at least one monohydroxy-monocarboxylic acid compound, the monohydroxy-monocarboxylic acid compound obtained by esterification of hydrocarboxylic acids or by reaction of a diol with at least one dicarboxylic acid or anhydride compound,
• to form an intermediate, followed by reacting the intermediate with
• C. a compound containing at least one basic ring nitrogen and a group which is capable of reacting with an isocyanate group,
• wherein about 30-70% of the isocyanate groups of the polyisocyanates are reacted with B.sub.1 and B.sub.2 and about 30-70% with C.