Patent ID: 8859677

Claim:
A polyester amine dispersant of formula (1): wherein, T-V-(A) m -U- is a polyester chain T is a polyester polymerisation terminating group containing R—C(═O)— or R—O— where R is a C 1 to C 20 hydrocarbyl group and T is derived from an ester forming reaction of a carboxylic acid or an alcohol; V is a direct bond connecting T to (A) m ; A is an oxyalkylenecarbonyl unit derived from one or more different hydroxyl-C 2-20 -alkenylene carboxylic acids or hydroxyl-C 1-20 -alkylene carboxylic acid or lactones thereof forming a polyester segment (A) m ; U is a direct bond or a divalent linkage of the structure —CH 2 —CH(R 2 )—C(═O)—O—R 3 —O— wherein R 2 is hydrogen or methyl and R 3 is ethyl and being the residue of hydroxyethyl(meth)acrylate linking Z to (A) m ; Z is polyvinylamine, polyallylamine or a poly(C 2-4 -alkyleneimine) of number average molecular weight of 1,000 to 100,0000 g/mole that has been linked to (A) m via U; W is the reaction product of an amino or imino group of Z with a) urea at 100 to 150° C. or b) oxygen to form an N-oxide; m is from 2 to 2000; and x is from 1 up to the maximum number of available amino and/or imino groups in Z which do not carry the group T-V-(A) m -U-.