Comb polymer and use thereof as dispersing agent

A process for preparing a comb polymer having repeating units of at least one of the structures of formulae (II) to (IV)

• wherein R1 represents a polyoxyalkylene group and A represents an organic group, and wherein the comb polymer has end groups of the general formula (V)
• wherein R2 and R3 independent of each other are selected from a) organic groups having 1 to 24 carbon atoms and b) R1, the process comprising reacting
• a) a diepoxide and an amine, wherein the molar ratio of epoxide groups to amine active hydrogens of the amine is not equal to 1:1, and
• b) a monoepoxide of the formula (VII)
• if a molar excess of amine active hydrogens is employed in a), or a secondary amine of the formula HNR2R3, if a molar excess epoxide groups is employed in a), wherein the amine in a) consists of primary monoamines of the formula R1—NH2 where R1 represents is a polyoxyalkylene group terminated by a hydrocarbyl group having 1 to 10 carbon atoms or by a hydroxyl group, R2 and R3 independent of each other are selected from a) organic groups having 1 to 24 carbon atoms and b)R,-and R4 is an organic group having 2 to 20 carbon atoms and selected from hydrocarbyl groups, ether groups and ester groups.