Patent ID: 7268203

Claim:
A process for preparing modified polymeric dispersing additives which comprises reacting a hyperbranched polyurethane having from 2 to 100 NCO groups and a molar mass of from 500 to 50,000 g/mol with one or more polyether derivatives selected from polyethylene glycol derivatives of the formula I and polyTHF derivatives of the formula II where in each case R is selected from hydrogen or C 1 -C 40 alkyl or C 7 -C 13 aralkyl or C 6 -C 14 aryl and n is an integer from 2 to 500, preferably from 2 to 200, and copolymers of ethylene oxide and propylene oxide or butylene oxide or terpolymers of ethylene oxide and propylene oxide and butylene oxide, it being possible for said polymers to be branched.