Toner for developing electrostatic latent images
AssigneeMinolta Camera Kabushiki Kaisha
InventorMasahiro Anno
Life of this patent
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Abstract
A toner for developing electrostatic latent images obtained by passing a toner composition-dispersed phase comprising at least a thermoplastic resin dissolved/dispersed in organic solvents through a microporous body to form an emulsion in an aqueous solution which is to form a continuous phase, and then removing the organic solvents from the emulsion.
Claims14
A production method of a toner for developing an electrostatic latent image formed on an electrostatic latent image-retaining member comprising:
- a first step of passing a toner composition-dispersed phase comprising a thermoplastic resin dissolved or dispersed in an organic solvent through a microporous body to form a homogeneous emulsion in a continuous phase of an aqueous solution, said microporous body having penetrated pores with an uniformity in the pore diameter distribution;
- a mechanical strength sufficient to resist deformation by the passed dispersed phase;
- a chemical inertness to the dispersed phase, the continuous phase and toner composition;
- and a higher wettability to the liquid of the continuous phase than the liquid of the dispersed phase;
- a second step of removing the organic solvent from the toner composition-dispersed phase and obtaining toner particles dispersed in the aqueous solution;
- and
- a third step of removing the aqueous solution and obtaining toner particles.
a production method of a toner for developing an electrostatic latent image formed on an electrostatic latent image-retaining member comprising:
- a first step of forming a homogeneous emulsion of a toner composition-dispersed phase in a continuous phase of an aqueous solution, said toner composition-dispersed phase comprising a thermoplastic resin dissolved or dispersed in an organic solvent;
- a second step of removing the organic solvent form the toner composition-dispersed phase and obtaining toner particles dispersed in the aqueous solution, and
- a third step of removing the aqueous solution and obtaining toner particles having a 15% or lower coefficient of fluctuation of toner particles;
- said coefficient of fluctuation defined as:
- coefficient of fluctuation=(.sigma./Xm).times.100 wherein a standard deviation (.sigma.) is represented by the following formula:
- ##EQU3## wherein X.sub.1, X.sub.2 . . . X.sub.n represent measured values of particle diameters of the sample particles, and X.sub.m represents the mean value of the respective n measured value, and
- wherein the first step is passing the toner composition-dispersed phase through a microporous body to form the homogeneous emulsion in the continuous phase, said microporous body having penetrated pores with an uniformity in the pore diameter distribution;
- a mechanical strength sufficient to resist deformation by the passed dispersed phase;
- a chemical inertness to the dispersed phase, the continuous phase and toner composition;
- and a higher wettability to the liquid of the continuous phase than the liquid of the dispersed phase.
Dependencies are inferred from the claim text.