Abstract: The invention relates to a dispersing agent or salts thereof, comprising the reaction product of:A one or more polyisocyanates with an average functionality of about 2 to about 5, withB a compound of the type Y--R--X, wherein Y represents a ring structure with at least one nitrogen atom in the ring, R represents a chain of at least three atoms and X has the meaning O--R.sup.1 or N(R.sup.1) (R.sup.2), wherein R.sup.1 is H or a group of the formula R.sup.3 --Z, wherein R.sup.3 represents a chain with at least two atoms and Z represents OH or NH.sub.2, and R.sup.2 represents a group of the formula R.sup.3 --Z, which compound is obtainable through reaction of an acrylate compound or an epoxide compound with a cyclic compound which has at least one group of the structure ##STR1## in the ring.

Abstract: The invention relates to a polymer suitable as a dispersant, built up fromA) 0-80 mol % of one or more monomers having the formula ##STR1## in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be the same or different and represent H or alkyl,B) 0-70 mol % of one or more monomers having the formula ##STR2## in which R.sub.5, R.sub.6 and R.sub.7 may be the same or different and represent H or alkyl and R.sub.8 is alkyl or substituted alkyl, and the alkyl group R.sub.

Abstract: The present invention relates to dispersing agents or their salts, comprisingA the reaction product of one or more polyisocyanates having an average functionality of from 2.0 to 5, withB at least a monohydroxyl compound,C at least a dicarboxylic acid compound andD a compound containing at least one basic ring nitrogen and an isocyanate-reactive group, in which of the isocyanate groups about 30-70% are reacted with B and C together and about 30-70% with D.

Abstract: The present invention relates to dispersing agents or their salts, comprisingA the reaction product of one or more polyisocyanates having an average functionality of from 2.0 to 5, withB a mixture from B.sub.1 monohydroxyl compounds and B.sub.2 monohydroxy-, monocarboxylic acid compounds, or monoamino-, monocarboxylic acid compounds andC a compound containing at least one basic ring nitrogen and an isocyanate-reactive group, in which of the isocyanate groups about 30-70% are reacted with B and about 30-70% with C,and the preparation of such dispersing agents.