| abstract |
A NON-AQUEOUS PSEUDO-DISPERSION OF POLYMERIC PARTICLES IS FORMED BY POLYMERIZING AT LEAST ONE ETHYLENICALLY UNSATURATED MONOMER IN A DISPERSING LIQUID OF ALIPHATIC HYDROCARBON AND AN ACTIVE SOLVENT FOR THE POLYMER IN THE PRESENCE OF A POLYMERIZABLE ETHYLENICALLY UNSATURATED CARBOXYLIC ACID, AN IMINE, AND A DISPERSION STABILIZER WHICH IS A BRANCHED COPOLYMER HAVING TWO TYPES OF POLYMERIC COMPONENTS OF WHICH ONE TYPE IS SOLVATED BY THE DISPERSING LIQUID AND THE OTHER TYPE IS AN ANCHOR POLYMER OF DIFFERENT POLARITY TO THE FIRST TYPE AND BEING RELATIVELY NON-SOLVATABLE BY THE DISPERSING LIQUID AND BEING CAPABLE OF BEING ANCHORED TO THE POLYMERIZED PARTICLES OF THE ETHYLENICALLY UNSATURATED MONOMER AND SAID ANCHOR POLYMER CONTAINING PENDANT GROUPS CAPABLE OF COPOLYMERIZING WITH ETHYLENICALLY UNSATURATED MONOMERS. THE RESULTING POLYMER IS STABLE UPON THE ADDITION OF LARGE AMOUNTS OF ACTIVE OR COALESCING SOLVENTS. IN ADDITION TO THE IMPORTANCE OF THIS POLYMER AS A PROTECTIVE COATING, IT IS AN EXCELLENT DISPERSANT FOR THE GRINDING OF PIGMENTS AND ESPECIALLY CARBON BLACK PIGMENTS. |