DE3641581

Addition compounds suitable for use as dispersing agents and dispersion stabilizers obtainable by reacting polyisocyanates having an average functionality from 2.5 to 10 with monohydroxy compounds, reacting the resulting reaction products with compounds of Formula II G-(E)n II wherein E represents -OH, -NH2 and/or -NHR (wherein R represents an alkyl group having 1 to 4 carbon atoms), n represents 2 or 3, and G represents an aliphatic, cycloaliphatic and/or aromatic group, and further reacting the resulting reaction product with compounds of Formula III Z-Q III or IV Z-NH-Z IV wherein Q represents -OH, -NH2, -NHR (wherein R represents an alkyl group having 1 to 4 carbon atoms) or -SH, and Z represents a group which contains at least one acidic functional group, OH-group or Si(OR)m(R')3-m group (wherein R and R' represent alkyl groups having 1 to 10 carbon atoms and m=1-3). Optionally, OH-groups present in the reaction product may be further reacted with polycarboxylic acids or their anhydrides. The invention also relates to a process for producing these addition compounds, to their use, and to powdered or fibrous solids which are to be worked into liquid systems which are coated with these dispersing agents.