Toner for developing electrostatic latent images
First Claim
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1. 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.
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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.
53 Citations
14 Claims
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1. A production method of a toner for developing an electrostatic latent image formed on an electrostatic latent image-retaining member comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. a production method of a toner for developing an electrostatic latent image formed on an electrostatic latent image-retaining member comprising:
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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=(σ
/Xm)×
100 wherein a standard deviation (σ
) is represented by the following formula;
##EQU3## wherein X1, X2 . . . Xn represent measured values of particle diameters of the sample particles, and Xm represents the mean value of the respective n measured value, andwherein 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. - View Dependent Claims (11, 12, 13, 14)
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Specification