Aromatic amide dispersant

A dispersant or its salts comprising a polymer having the following structure, or salts thereof:

• n is 1, and m is equal to n in each polymer;
• R1 is independently CN, NO2, Cl, Br, CH3, NH2 or OH where a is 0 to 4;
• R2 is H, a C1-50 optionally substituted hydrocarbyl, or a C1-50 optionally substituted hydrocarbonyl group;
• G is a C1-50 hydrocarbyl group optionally substituted with heteroatoms represented as ether, ester, aldehyde, ketone, amide, urethane, alcohol or carboxylic acid groups, or a residue of an optionally substituted alkyl (meth)acrylate or (meth)acrylamide, or a ring opening product of an epoxide of the formula
• wherein R6 can individually on each occurrence be H or CH3 or C2H5 or one of the following groups:
• wherein D is C1-5 alkyl group, CN, OH, NO2, NH2, halogen, CO2H, SO3H, CH3 or OCH3;
• p is from 0 to 4;
• R3 is a linear or branched C1-50;
• T is —C(O)—CH(R4)CH2 or C1-5 hydrocarbyl chain;
• when G is C1-50 hydrocarbyl, T is —C(O)—CH(R4)CH2;
• when G is a residue of an optionally substituted alkyl (meth)acrylate or (meth)acrylamide, or a ring opening product of an epoxide, T is C1-5 hydrocarbyl chain;
• R4 is H or Me;
• Y independently in each repeat unit is C2-4 alkyleneoxy;
• Q comprises a naphthalene, a biphenyl, or a phenyl, wherein the carboxylic acid group attached to Q is attached to a carbon atom of the aromatic ring of Q;
• wherein the hydrogen of any acid in Formula I is optionally replaced by a metal, amine, or ammonium cation to place the dispersant in the form of a salt;
• and
• x is 2 to 90.