Encapsulated magnetic pigments, processes for their preparation and their uses

A coated colored pigment particle selected from the group consisting of metallized azo reds, toluidine reds, naphthol reds, pyrazolones, rhodamines, quinacidones, phthalocyanine blues, phthalocyanine greens, carbazole violets, monoarylide yellow, diarylide yellow, chrome yellow, Red Lake C, lithol reds, lithol rubine, Bon Maroon, perylene pigments, red 2B, orange 36, diarylide orange, dianisdine orange tolyl orange and dinitroaniline, said particle having a particle diameter from about 0.1 to about 100 microns, and having a solid coating on its surface, said coating comprising a vegetable oil and oxidized polyethylene, said coated pigment particle being capable of forming a dispersion in a carrier vehicle.

A coated colored pigment particle selected from the group consisting of metallized azo reds, toluidine reds, naphthol reds, pyrazolones, rhodamines, quinacidones, phthalocyanine blues, phthalocyanine greens, carbazole violets, monoarylide yellow, diarylide yellow, chrome yellow, Red Lake C, lithol reds, lithol rubine, Bon Maroon, perylene pigments, red 2B, orange 36, diarylide orange, dianisdine orange tolyl orange and dinitroaniline, said particle having a particle diameter less than about 0.2 microns, and having a solid coating on its surface, said coating comprising a oxidized polyethylene, said coated colored pigment particle being capable of forming a dispersion in a carrier vehicle.

A coated particle capable of being dispersed in a carrier vehicle, said particle being selected from the group consisting of magnetic particles, pigments, and carbon black, having a particle diameter from about 0.1 to about 100 microns, and having a solid coating on its surface, said coating comprising oxidized polyethylene, wherein said coating has been made by the process comprising:

• (1) forming a melt comprising the oxidized polyethylene and an oil, (2) dispersing said particle in said melt, and 3) allowing the resulting dispersion to cool;
• the melt being free of volatile organic solvents and the melt being present in an amount from about 10 to about 90 percent, based on the total weight of the coated particles.