| abstract |
A method of dispersing a solid particulatenmaterial in an aqueous medium by addition to thenaqueous medium of a dispersing agent wherein thensolid particulate material is to be used as a fillernor pigment in a sheet material which is required toncome into contact with foodstuffs, wherein thendispersing agent is a composition comprising:n (1) up to 0.25% by weight, based on the dry weight ofnthe particulate solid material, of a water-solublensalt of a poly(acrylic acid) having a weight averagenmolecular weight not greater than 20,000, and (2) from 0.02% to 1.5% by weight, based on the drynweight of the particulate solid material, of eithern (a) an anionic polyelectrolyte which comprises anwater-soluble salt of a copolymer of acrylic acidnwith acrylamide; or (b) a water-soluble condensed phosphate salt. |