Process for preparing surface-treated pigments

Claim 1

A PROCESS FOR TREATING PIGMENTS TO IMPART TO THEM IMPROVED DISPERSIBILITY IN ORGANIC SOLVENTS, LACQUERS AND SYNTHETIC MATERIALS, SAID PIGMENTS HAVING POSITIVE SURFACE CHARGES WHEN DISPERSED IN WATER, WHICH COMPRISES FORMING IN AN AQUEOUS MEDIUM A DISPERSION OF THE PIGMENT TO BE TREATED, THEN INCORPORATING INTO SAID DISPERSION A 1 TO 5% AQUEOUS SOLUTION OF 0.1 TO 30% BY WEIGHT, BASED ON THE PIGMENT WEIGHT, OF A FIRST MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKALI AND AMMONIUM SALTS OF SATURATED, UNSATURATED AND POLYMERIZED ALIPHATIC, ARYLATED ALIPHATIC, AROMATIC AND HYDROAROMATIC CARBOXYLIC ACIDS CONTAINING AT LEASAT 6 CARBON ATOMS, ALKYL- ARYL- AND MIXED ALKYL-ARYL SULFONATES, SULFATES, PHOSPHATES AND POLYPHOSPHATES, THE CONDENSATION PRODUCTS OF ALKYLOXY-, ARYLOXY- AND AMINO-SULFONIC ACIDS WITH FATTY ACIDS CONTAINING FROM 8 TO 18 CARBON ATOMS, THE SULFONATED DERIVATIVES OF CONDENSATION PRODUCTS OF FATTY ACIDS CONTAINING FROM 8 TO 18 CARBON ATOMS WITH AROMATIC DIAMINES, THE SEMIESTERS AND N-ALKYLSEMIAMIDE DERIVATIVES OF ALIPHATIC, ARYLATED ALIPHATIC, AROMATIC AND HYDROAROMATIC POLYCARBOXYLIC ACIDS, ALKOXO ACIDS OF ALKY BORATES, AND MIXTURES THEREOF, INCORPORATING INTO SAID DISPERSION A 0.1 TO 2 N AQUEOUS SOLUTION CONTAINING 0.05 TO 5% BY WEIGHT, BASED ON THE PIGMENT WEIGHT OF A SECOND MEMBER SELECTED FROM THE GROUP CONSISTING OF BORIC ACID, ALKALI BORATES, ALKALI STANNATES, ALKALI ANTIMONITES, ALKALI ANTIMONATES, ALKALI ARSENITES, ALKALI ARSENATES, ALKALI ALUMINATES, ALKALI ZINCATES, ALKALI PLUMBITES, ALKALI CHROMITES, AND MIXTURES THEREOF, INCORPORATING INTO SAID DISPERSION A 0.1 TO 2 N AQUEOUS SOLUTION OF 1 TO 2 EQUIVALENTS, BASED ON THE AMOUNT OF SAID SECOND MEMBER, OF SALTS SOLUBLE IN WATER OF CATIONS SELECTED FROM THE GROUP CONSISTING OF LEAD, MERCURY, COPPER, CADMIUM, DIVALENT TIN, COBALT, NICKEL, DIVALENT IRON, ZINC, MANGANESE, MAGNESIU, CALCIUM, STRONTIU, BARIU, TRIVALENT IRON, CHROMIUM, ALUMINUM, TETRAVALENT TIN, TITANIUM AND MIXTURES THEREOF, AND THEREAFTER SEPARATING THE PIGMENT FROM SAID AQUEOUS MEDIUM.