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AssigneeSavin Corporation
InventorsBenzion Landa, Peretz Ben-Auraham, Joseph Hall, George A. Gibson
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A liquid composition for developing latent electrostatic images comprising toner particles associated with a pigment dispersed in a nonpolar liquid. The salient feature of the invention is that the toner particles are formed with a plurality of fibers or tendrils from a thermoplastic polymer and carry a charge of a polarity opposite to the polarity of the latent electrostatic image. The polymer is insoluble or insolvatable in the dispersant liquid at room temperature. The toner particles are formed by plasticizing the polymer and pigment at elevated temperature and then either permitting a sponge to form and wet-grinding pieces of the sponge or diluting the plasticized polymer-pigment while cooling and constantly stirring to prevent the forming of a sponge while cooling. When cool, the diluted composition will have a concentration of toner particles formed with a plurality of fibers.
A toner constituent utilizable with a nonpolar liquid for developing latent electrostatic images by electrophoretic movement through said liquid including in combination a particle of thermoplastic polymer formed with a plurality of integral fibers extending therefrom, said fibers being adapted to mat with like fibers of other like particles during development, and means for imparting a charge of predetermined polarity to said particles.
A liquid composition for developing latent electrostatic images including in combination a major amount of a nonpolar, nontoxic liquid having a volume resistivity in excess of 10.sup.9 ohm centimeters, a dielectric constant below 3.0, and a vapor pressure of less than 10 millimeters of mercury at 25.degree. C.;
A liquid composition for developing latent electrostatic images including in combination a major amount of a nonpolar liquid having a volume resistivity in excess of 10.sup.9 ohm centimeters, a dielectric constant below 3.0, and a vapor pressure of less than 10 millimeters of mercury at 25.degree. C.;
A liquid composition for developing latent electrostatic images including in combination a major amount of nonpolar, nontoxic liquids having a volume resistivity in excess of 10.sup.9 ohm centimeters, a dielectric constant below, 3.0, and a vapor pressure of less than 10 millimeters of mercury at 25.degree. C.;
A liquid composition for developing latent electrostatic images including in combination a major amount of nonpolar liquid having a volume resistivity in excess of 10.sup.9 ohm centimeters, a dielectric constant below 3.0, and a vapor pressure of less than 10 millimeters of mercury at 25.degree. C.;
A toner constituent utilizable with a nonpolar liquid for developing latent electrostatic images by electrophoretic movements through said liquid including in combination a toner particle comprising thermoplastic polymer formed with a plurality of integral fibers extending therefrom, said fibers being adapted to mat with like fibers of other like particles during development, and means for imparting a charge of predetermined polarity to said particles
Dependencies are inferred from the claim text.