Process for preparation of solid pigment resin dispersion

Claim 1

A process for preparing a solid pigment dispersed composition which comprises subjecting A. a liquid composition comprising: i. at least one ethylenically unsaturated polymerizable compound selected from the group consisting of monovinyl aromatic hydrocarbons, ethylenically unsaturated carboxylic esters, acrylonitrile, methacrylonitrile, glycidyl vinyl compounds, ethylenically unsaturated compounds having at least one hydroxyl group, ethylenically unsaturated carboxylic acids, ethylenically unsaturated amides and ethylenically unsaturated compounds having at least one blocked isocyanate group, and ii. at least one resin dissolved or dispersed therein, said resin being selected from the group consisting of natural resins, rosin esters, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cellulose methyl ether, cellulose ethyl ether, xylene resins, toluene resins, petroleum resins, silicon resins, polyurethane resins, phenol resins, aminoplast resins, epoxy resins, blocked polyisocyanate resins, acrylic resins, methacrylic resins and alkyd resins having at least one mercapto group to be grafted with the ethylenically unsaturated compound, and B. at least one pigment dispersed in said liquid composition, to suspension or bulk polymerization to form a reaction mixture and recovering the product from suspension or bulk polymerization reaction mixture, the suspension polymerization being performed in the presence of a suspension stabilizer to produce a spherical particulate product, said liquid composition being color matched to said pigment before said suspension or bulk polymerization.