Water-in-oil dispersions of hydrophilic polymers, based on acrylic acid partially or totally salified with ammonia, their process of preparation and their application in particular in the printing pigment

摘要

These dispersions contain:… a) from 65 to 75% of a dispersed aqueous phase including 35 to 50% of a hydrophilic copolymer of M.W. higher than 3x106 based on 0 to 50% of acrylamide, 0.008 to 0.1% of bisacrylamidoacetic acid partially or completely converted into salt with ammonia;… b) from 3 to 7% of an emulsifying system exhibiting overall an HLB higher than 7;… c) the remainder to 100% using an oil phase.