Dispersant and compositions thereof

1. 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 C 1-50 -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 C 2-4 -alkyleneoxy;

T or T′ is independently C 2-4 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 C 1-50 -optionally substituted hydrocarbyl or C 1-50 -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.

2. The composition of claim 1 , wherein Z of Formula (1) is a residue of an inorganic acidic polar head group of a sulphur or phosphorus acidic moiety.

3. The composition of claim 2 , wherein the sulphur or phosphorus acidic moiety comprises —SO 3 H or —PO 3 H 2 , or ester, or salt derivatives thereof.

4. The composition of claim 1 , wherein Y is a mixture of C 3-4 -alkyleneoxy where the chain represented by (Y) x is in part —CH 2 CH 2 CH 2 CH 2 O—, —CH 2 CH(CH 3 )O— or —CH 2 —CH(CH 2 —CH 3 )—O—, with up to 75% ethyleneoxy groups present.

5. The composition as claimed in claim 1 wherein the organic liquid comprises at least 0.1% by weight of a polar organic liquid based on the total organic liquid.

6. The composition as claimed in claim 1 wherein the particulate solid is a pigment.