Patent ID: 6315867
Filing Date: 2001-11-13
Classification: D21H

Abstract:
A method of dispersing a solid particulate material in an aqueous medium by addition to the aqueous medium of a dispersing agent wherein the solid particulate material is to be used as a filler or pigment in a sheet material which is required to come into contact with foodstuffs, wherein the dispersing agent is a composition comprising:(1) up to 0.25% by weight, based on the dry weight of the solid particulate material, of a water soluble salt of a poly(acrylic acid) having a weight average molecular weight not greater than 20,000; and(2) from 0.02% to 1.5% by weight, based on the dry weight of the solid particulate material, of an anionic polyelectrolyte which is a water soluble salt of a copolymer of acrylic acid and acrylamide having a weight average molecular weight of from 1,000 to 10,000 and a molar ratio of acrylic acid to acrylamide in the range of from 98.8:0.2 to 90:10;wherein the weight ratio of (1) to (2) present in the composition is from 1:1 to 1:5.