Aqueous graft copolymer pigment dispersants

Details Aqueous graft copolymer pigment dispersants Aqueous graft copolymer pigment dispersants

C - Chemistry, Metallurgy

08

F

C08F 299/00 (2006.01) C08F 290/04 (2006.01) C09D 17/00 (2006.01)

Patent

CA 2157361

A pigment dispersion useful for forming coating compositions containing dispersed pigment, an aqueous carrier and a graft copolymer dispersant; wherein the graft copolymer has a weight average molecular weight of about 5,000-100,000 and has a polymeric backbone and macromonomer side chains attached to the backbone wherein 1) the polymeric backbone is hydrophobic in comparison to the side chains and contains 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 contain polymerized ethylenically unsaturated monomers and 2-100 % by weight, based on the weight of the graft copolymer, of polymerized ethylenically unsaturated acid containing monomers and have a weight average molecular weight of about 1,000-30,000 and wherein the acid groups of the graft copolymer are neutralized with an inorganic base or an amine. The graft copolymer and a process for making the graft copolymer also are disclosed.

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