Abstract: A color toner, comprising a binder resin and a colorant, wherein the colorant comprises organic pigment particles treated with an isocyanic ester or a silicon-containing compound.

Abstract: Toner for developing electrostatic latent images is produced by dispersing an anionic inorganic dispersant in an aqueous medium; generating cationic inorganic particles in the aqueous medium which are hard to dissolve in water so as to produce a dispersant medium of the anionic inorganic dispersant and the cationic inorganic particles; dispersing a monomer composition including at least polymerizable monomer and a cationic material into the dispersant medium and generate particles of the monomer composition; and suspension-polymerizing the monomer composition particles and produce toner.

Abstract: A process for producing a toner comprising:heating a monomer composition containing at least a polymerizable monomer and a release agent to a temperature not lower than the melting point or the softening point of said release agent todissolve the release agent in the polymerizable monomer and therebypreparing a monomer composition in which the release agent is dissolved;cooling the monomer composition to a temperature lower than the melting point or the softening point of the release agent to precipitate said release agent and therebypreparing a monomer composition containing the precipitated releasing agent particles having a number average size of 0.5 to 5 .mu.m;granulating in an aqueous dispersion medium the monomer composition to prepare a particle;carrying out suspension polymerization of the particle of the monomer composition at a temperature lower than the melting point or the softening point of the release agent.

Abstract: A dispersion stabilizer having a nitrogen-containing organic group and a water-soluble acidic substance are added to an aqueous medium. Into the aqueous medium, a monomer composition comprising at least a polymerizable monomer, an anionic polymer, a polymerization initiator and a colorant is added and dispersed therein into a prescribed particle size. The particles of the monomer composition are subjected to suspension polymerization. The resultant toner is caused to have a sharp particle size distribution and an improved anti-blocking property because of the combined effects of the dispersion stabilizer and the acidic substance contained in the aqueous medium and the anionic polymer contained in the monomer composition.

Abstract: A toner for developing electrostatic latent images is produced by a process comprising the steps of: (a) stirring at least water, hardly water-soluble inorganic fine powder and a specific compound thereby to prepare an aqueous dispersion medium; (b) adding a polymerizable monomer composition comprising at least a polymerizable monomer and a polymerization initiator to the aqueous dispersion medium; (c) forming particles of the polymerizable monomer composition in the aquoeus dispersion medium; (d) subjecting the particles of the polymerizable monomer composition to suspension polymerization, thereby to produce toner particles; and (e) removing the hardly water-soluble inorganic fine powder attached to the surfaces of the toner particles by an aqueous alkaline or acidic solution.

Abstract: A process for preparing a toner obtained by a suspension polymerization method comprises stirring a mixture containing at least a polymerizable monomer containing 5 to 500 ppm of a polymerization inhibitor dissolved in the polymerizable monomer and a colorant; preparing a polymerizable monomer composition by adding a polymerization initiator to said mixture; stirring the prepared polymerizable monomer composition; and carrying out suspension polymerization of the polymerizable monomer composition dispersed in an aqueous medium.

Abstract: An adaptive differential pulse code modulation system includes an adaptive quantizer and an adaptive predictor which have a coding characteristic optimized to a voice signal, and a quantizer and a predictor which have a coding characteristic optimized to a voice band MODEM signal. This system is normally used as a coding system optimized to the voice signal, and when this system detects a MODEM training signal, it becomes a coding system optimized to the MODEM signal.

Abstract: A presetting counter device comprising a ratchet wheel coupled to a cycle number setting dial and being stepwise rotatable for reducing the setting of the dial, an indexer engageable with the ratchet wheel in operative relation to the movement of a cyclically movable device to rotate the ratchet wheel stepwise by one pitch thereof at a time, a cycle repeating signal generator, a member movable with the ratchet wheel for actuating the signal generator and having a signal generator actuating portion with the same pitch angle as the ratchet wheel, and the ratchet wheel being adapted to be temporarily halted in the course of its stepwise rotation at a position where the signal generator is held actuated by the actuating member.