Pigment particles coated with polymer and method of preparing the same

Claim 1

A PROCESS OF PRODUCING PHTHALOCYANINE BLUE PIGMENTED COLOR MASTER BATCHES OF POLYACRYLONITRILE COATED COPPER PHTHALOCYANINE PIGMENT WHICH COMPRISES DISPERSING ABOUT 139 PARTS COPPER PHTHALOCYANINE BLUE PRESS CAKE CONTAINING ABOUT 36% PIGMENT SOLIDS AND THE REST WATER IN ABOUT 100 PARTS WATER WITH ABOUT 9 PARTS OF 50% STEARAMIDOPROPYLDIMETHYLHYDROXYETHYL AMMONIUM CHLORIDE IN ISOPROPANOL, STIRRING UNTIL THE AVERAGE PARTICLE SIZE OF THE PIGMENT IS LESS THAN ABOUT 0.5 MICRON, DILUTING WITH ABOUT 300 PARTS WATER, ADDING, UNDER NITROGEN, ABOUT 65 PARTS FRESHLY DISTILLED ACRYLONITRILE, HEATING GRADUALLY TO ABOUT 55*C., ADDING A SOLUTION OF ABOUT 7.14 PARTS OF AMMONIUM PERSULFATE AND ABOUT 4.34 PARTS OF SODIUM HYDROSULFITE IN ABOUT 100 PARTS OF WATER SLOWLY OVER ABOUT A TWO HOUR PERIOD, WHILE MAINTAINING THE TEMPERATURE BETWEEN ABOUT 62*C. AND 68*C., HOLDING AT ABOUT 62*C. FOR ABOUT AN HOUR, COOLING TO ABOUT 20*C., FILTERING, WASHING THE FILTER CAKE WITH AT LEAST SEVERAL THOUSAND PARTS OF WATER, THEREBY WASHING OUT THE STEARAMIDOPROPYLDIMETHYLHYDROXYETHYL AMMONIUM CHLORIDE, ISOPROPANOL, AND OTHER WATER SOLUBLE IMPURITIES, DRYING, AND THEN CRUSHING THE RESULTANT FILTER CAKE.