Polymer dispersions using hydrocarbons and graft copolymer dispersing agents

Claim 1

A COMPOSITION OF MATTER COMPRISING A SUBSTANTIALLY ANHYDROUS DISPERSION, IN A LIQUID ESSENTIALLY INERT HYDROCARBON MEDIUMHAVING A BOILING RANGE FROM ABOUT -50* C. TO 300*C. AND CONSISTING ESSENTIALLY OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC, AROMATIC, AND NAPHTHENIC HYDROCARBONS, OF AN ESSENTIALLY LINEAR ADDITION POLYMER OF ETHYLENICALLY UNSATURATED MOLECULES WHICH IS ESSENTIALLY INSOLUBLE IN THE MEDIUM, NOT OVER 10% BY WEIGHT OF THE DISPERSED POLYMER BEING DISSOLVED IN THE MEDIUM AND 90% TO 100% BY WEIGHT OF THE DISPERSED POLYMER BEING IN THE FORM OF DISCRETE PARTICLES HAVING A SIZE OF ABOUT 0.1 TO 10 MICRONS DISPERSED IN THE MEDIUM BY A HYDROPHOBIC POLYMERIC DISERSING AGENT COMPRISING A COMPONENT OF POLYMERIC SIZE FORMED OF A POLYMERIC PRECUSOR WHICH IS SOLUBLE IN THE MEDIUM AND A COMPONENT FORMED OF POLYMERIZED MONOMER MOLECULES OF ESSENTIALLY SIMILAR CONSTITUTION TO THAT OF POLYMERIZED MONOMER MOLECULES IN THE DISPERSED ADDITION POLYMER TO RENDER THIS LATTER COMPONENT PREFERENTIALLY SOLUBLE IN THE DISPERSED POLYMER, THE PRECURSOR BEING A HYDROCARBONSOLUBLE POLYMER CONTAINING SUFFICIENT HYDROCARBON GROUPS OF AT LEAST FOUR CARBON ATOMS TO IMPART SOLUBILITY THEREOF IN THE HYDROCARBON MEDIUM SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS AND COPOLYMERS OF AT LEAST ONE ESTER OF AN ACID OF THE FORMULA CH2=C(-COOH)-(CH2)(N-1)-H WHERE N IS AN INTEGER HAVING A VALUE OF 1 TO 2 WITH AN ALCOHOL HAVING FROM 4 TO 18 CARBON ATOMS.