Dispersants

摘要

The present invention relates to dispersants for dispersing a particulate solid for millbases, paints and inks. The present invention provides a composition containing a particulate solid, a polar organic medium and a compound or salts thereof for formula T-(A)m(B)n—X—Z-Q(0-p) wherein T is hydrogen or a polymerization terminating group; A is the residue of a hydroxy carboxylic acid or lactone thereof; B is the residue of an amino carboxylic acid; X is a direct bond or a divalent group; Z is an acidic or basic group or a moiety which contains an acidic or basic group; Q is an optional residue of an oxide, urea or a dibasic acid or anhydride thereof; m and n are positive integers; and p represents the number of residual amino and/or imino groups in Z.

主权项

1. A dispersant of formula 1:
T-(A)m(B)n—X—Z-Q(0-p)  Formula (1)including salts thereofwherein
-(A)m(B)n— is the reaction product of at least one hydroxy carboxylic acid or lactone thereof and at least one amino carboxylic acid at 50 C to 250 C optionally in the presence of a esterification catalyst where m and n are as described below; T is hydrogen or a polymerisation terminating group; A is an oxyalkylene carbonyl residue of a hydroxy carboxylic acid or lactone thereof; B is derived from said amino carboxylic acid; X is a direct bond or a divalent linking group; Z is a basic group of 1000 to 200,000 g/mole number average molecular weight selected from polyvinylamine or poly(C2-4-alkyleneimine) or a moiety which contains said basic group; when Z is said polyvinylamine or poly(C2-4-alkyleneimine), Q is an oxygen atom of a N-oxide reaction product of amino or imino groups of Z reacted with oxygen or a peroxide, or a reaction product of said amino or imino groups reacted with dibasic acid or anhydride thereof; m and n are non-zero positive integers m+n is from 4 to 2000; (0-p) means from the value 0 to the value p; p represents the maximum available number of amino and/or imino groups in Z which does not carry the group T-(A)m(B)nX—; when Z is a basic group selected from polyvinylamine or poly(C2-4-alkyleneimine) or a moiety which contains said basic group there may be more than one group T-(A)m(B)n—X— attached to Z and said more than one group may be chemically the same or different.