Dispersant and compositions thereof

A composition comprising a particulate solid, an organic medium and a compound with an alkyleneoxy compound with an inorganic acidic polar head group (Z), wherein the compound is defined by Formula (I) and salts thereof:

• U—(Y)x-T-N(G)r—(B—Z)q (Formula 1)
• wherein
• U is independently R′—N-(G′)-T′-O—, or R—O—;
• R or R′ may be the same or different and are independently H or C1-50-optionally substituted hydrocarbyl, or hydrocarbonyl group (acyl group), or the residue of an epoxide, or the residue of an optionally substituted (meth) acrylic ester or amide group;
• Y is C2-4-alkyleneoxy;
• T or T′ is independently C2-4 alkylene;
• B is a methylene group;
• Z is an inorganic acidic polar head group, such as, a sulphur or phosphorous acidic polar head group;
• G and G′ may be the same or different and are independently H or C1-50-optionally substituted hydrocarbyl or C1-50-optionally substituted hydrocarbyl or hydrocarbonyl group or the residue of an epoxide, or the residue of an optionally substituted (meth) acrylic ester or amide group;
• r is zero or 1;
• q is 1 or 2, with the proviso that when q is 2, r is zero;
• and
• x is from 2 to 90
• wherein said organic medium is an organic liquid free of water or a plastics material.