Graft copolymer pigment dispersant

摘要

A pigment dispersant comprising a graft copolymer is described. The graft copolymer comprises a backbone having polymerized vinyl imidazole groups and side chains from macromonomers. The vinyl imidazole comprises 2 percent to 20 percent by weight of the graft copolymer and the macromonomer comprises 55 percent to 85 percent by weight of the graft copolymer. The pigment dispersant is useful for forming pigment dispersions that can be used in solvent borne coating compositions.

主权项

1. A pigment dispersant comprising a graft copolymer having a polymeric backbone and side chains attached to the backbone, wherein the graft copolymer is formed from a monomer mixture comprising;
a) in the range of from 2 percent to 20 percent by weight of vinyl imidazole monomer, wherein the vinyl imidazole monomer forms the backbone of the graft copolymer; and b) in the range of from 55 percent to 85 percent by weight of a macromonomer, wherein the macromonomer forms the side chains of the graft copolymer; andwherein the monomer mixture comprises less than 0.5 percent of acid functional monomers by weight based on the total weight of all of the monomers of the graft copolymer, wherein the macromonomer comprises polymerized ethylenically unsaturated monomers, and the percentages by weight are based on the total weight of the graft copolymer.