Abstract: A dispersion of solid inorganic particles in an aqueous medium which is stable to a range of pH's and added electrolyte wherein the dispersing agent is a water soluble copolymer derivable from a hydrophilic oligomer and certain defined olefinically unsaturated acids.

Abstract: A method for the preparation of colloidally stable particles of inorganic solid at high concentration which method comprises at least the step of precipitating from an aqueous medium the particles of the inorganic solid in the presence of a copolymer which comprises repeating units derived from:Component A: a hydrophilic oligomer or polymer bearing an addition-polymerizable olefinically-unsaturated group;Component B: an olefinically-unsaturated compound capable of copolymerizing with Component A and bearing a mineral acid group or a dicarboxylic acid group, or a carboxylic acid and a further group capable of hydrogen-bonding.