Dispersions

Claim 1

A process for the preparation of a dispersion of an inorganic pigment in a polar organic medium, said process consisting essentially of grinding the pigment in the polar organic medium in the presence of a dispersing agent, in which the dispersing agent is a tertiary amine of the formula: ##STR5## wherein each of A, B and D independently represents ##STR6## wherein each X independently represents an oxygen or a nitrogen atom provided that, where X is oxygen m+n=1 and p=1 and where X is nitrogen m+n=2 and p is from 1 to 30; each Q independently represents alkyl or --YH; and each Y independently represents a poly(lower alkylene oxy) chain containing from 3 to 50 lower alkylene oxy groups provided that, (i) at least one of A, B and D contains a poly(lower alkylene oxy) chain, (ii) at least 50% of the lower alkylene groups in each poly(lower alkylene oxy) chain is propylene and (iii) not more than one of the alkylene or alkyl groups contains more than 8 carbon atoms; or the salt of said amine with a mineral acid or with an aromatic carboxylic or sulphonic acid.