Patent ID: 6790902
Filing Date: 2004-09-14
Classification: C08F,C08K,C08L,C09D

Abstract:
A rutile titanium dioxide pigment slurry comprising an unfinished rutile titanium dioxide pigment, a dispersant and an organic amine wherein the dispersant is selected from the group consisting of (a) a graft copolymer comprising about 90 to 50% by weight of a polymeric backbone and correspondingly about 10 to 50% by weight of macromonomer side chains attached to the backbone and has a weight average molecular weight of about 5,000-100,000 and wherein (1) the polymeric backbone is hydrophobic in comparison to the side chains and consists essentially of polymerized ethylenically unsaturated hydrophobic monomers and up to 20% by weight based on the weight of the graft copolymer, of polymerized ethylenically unsaturated acid containing monomers; and (2) the side chains are hydrophilic macromonomers attached to the backbone at a single terminal point and consist essentially of polymerized ethylenically unsaturated monomers polymerized in the presence of a cobalt chain transfer agent and contain 20 to 50% by weight, based on the weight of the macromonomer, of polymerized ethylenically unsaturated acid containing monomers and have a weight average molecular weight of about 1,000 to 30,000 and wherein the acid groups of the graft copolymer are neutralized with an inorganic base or an amine; and (b) a block copolymer of type AB and BAB selected from the group consisting of BMA//MAA (10//10) and BMA//BMA/MMA (10//5/10).