Patent ID: 6413306
Filing Date: 2002-07-02
Classification: B01F,C08F,C09B,C09D

Abstract:
A pigment dispersion, useful for forming coating compositions, containing dispersed pigment, a non-aqueous carrier liquid and an ABC-block polymer dispersant; wherein:the ABC block polymer has a number average molecular weight of about 5,000-20,000 and contains a polymeric A segment, a polymeric B segment and a polymeric C segment; wherein the polymeric A segment of the block polymer consists essentially of polymerized monomers selected from the group consisting of alkyl (meth)acrylate monomers having 1-12 carbon atoms in the alkyl group, aryl (meth)acrylate monomers, cycloalkyl (meth)acrylate monomers or mixtures of any of the above; the polymeric B segment of the block polymer consists essentially of polymerized alkyl amino alkyl (meth)acrylate monomers having 1-4 carbon atoms in the alkyl group quaternized with an alkylating agent; and the polymeric C segment of the block polymer consists essentially of polymerized monomers of hydroxy alkyl (meth)acrylate having 1-4 carbon atoms in the alkyl group and polymerized monomers selected from the group consisting of alkyl (meth)acrylate monomers having 1-12 carbon atoms in the alkyl group, aryl (meth)acrylate monomers, cycloalkyl (meth)acrylates monomers and any mixtures thereof and optionally contains polymerized monomers selected from the group consisting of glycidyl (meth)acrylates and polyalkylene glycol (meth)acrylate; wherein the weight ratio of pigment to dispersant in the dispersion is about 1/100-200/100.