Dispersants

摘要

The present invention provides a dispersant of formula (1): T-V-(A)n, -U-Z-W, Formula (1) wherein, T is a polymerization terminating group; V is a direct bond or divalent linking group; A is the residue of one or more different hydroxy carboxylic acids or lactones thereof, U is a direct bond or a divalent linkage; Z is the residue of a polyamine or polyimine; W is the residue of an oxide or urea; 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)n, -U-.

主权项

1. 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 C1 to C20 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-C2-20-alkenylene carboxylic acids or hydroxyl-C1-20-alkylene carboxylic acid or lactones thereof forming a polyester segment (A)m; U is a direct bond or a divalent linkage of the structure —CH2—CH(R2)—C(═O)—O—R3—O— wherein R2 is hydrogen or methyl and R3 is ethyl and being the residue of hydroxyethyl(meth)acrylate linking Z to (A)m; Z is polyvinylamine, polyallylamine or a poly(C2-4-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-.