Developing agent and method for producing the same
A manufacturing method and developer technology, which can be applied in the directions of developer, electrography, optics, etc., can solve the problems of difficulty in use, inability to obtain a toner that fully satisfies fixability, color development, and erasability, etc.
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Embodiment 1
[0169] Mix 1.7 parts of color-developing particle C1 dispersion, 15 parts of toner component particle R1 dispersion, 83 parts and 7 parts of deionized water, and add 5 parts of aluminum sulfate 5% aqueous solution while stirring at 6500 rpm with a homogenizer (manufactured by IKA) Thereafter, the temperature was raised to 40° C. while stirring at 800 rpm in a 1 L stirring tank equipped with paddle blades. After standing at 40°C for 1 hour, 10 parts of a 10% aqueous solution of polycarboxylate sodium salt was added, heated to 68°C, left standing for 1 hour, and then cooled to obtain a colorless toner dispersion.
[0170] Next, the toner dispersion was repeatedly subjected to filtration and ion-exchanged water washing until the conductivity of the filtrate reached 50 μS / cm. Thereafter, the toner was frozen in a refrigerator at -20° C. to turn the toner blue, and dried in a vacuum dryer until the water content was 1.0% by weight or less to obtain dry particles.
[0171] After dr...
Embodiment 2
[0187] Mix 1.7 parts of color-developing particle C2 dispersion, 15 parts of toner component particle R1 dispersion, 83 parts and 7 parts of ion-exchanged water, and add 5 parts of aluminum sulfate 5% aqueous solution while stirring at 6500 rpm with a homogenizer (manufactured by IKA) Thereafter, the temperature was raised to 40° C. while stirring at 800 rpm in a 1 L stirring tank equipped with paddle blades. After standing at 40° C. for 1 hour, 10 parts of a 10% polycarboxylate sodium salt aqueous solution was added, heated to 68° C., left standing for 1 hour, and then cooled to obtain a cyan toner dispersion.
[0188] Next, the toner dispersion was repeatedly subjected to filtration and ion-exchanged water washing until the conductivity of the filtrate reached 50 μS / cm. Afterwards, it was dried by a vacuum dryer until the moisture content accounted for 1.0% by weight or less, and dried particles were obtained.
[0189] After drying, 2 parts by weight of hydrophobic silica a...
Embodiment 3
[0194] Mix 1.7 parts of color-developing particle C2 dispersion, 15 parts of toner component particle R1 dispersion, 83 parts and 7 parts of ion-exchanged water, and add 5 parts of aluminum sulfate 5% while stirring at 6500 rpm with a homogenizer (manufactured by IKA) After the aqueous solution, the temperature was raised to 40° C. while stirring at 800 rpm in a 1 L stirring tank equipped with paddle blades. After standing at 40°C for 1 hour, 10 parts of a 10% polycarboxylate sodium salt aqueous solution was added, heated to 90°C, left standing for 1 hour, and then cooled to obtain a colorless toner dispersion.
[0195] Next, the toner dispersion was repeatedly subjected to filtration and ion-exchanged water washing until the conductivity of the filtrate reached 50 μS / cm. Thereafter, the toner was frozen in a refrigerator at -20° C. to turn the toner into a blue color, and dried in a vacuum dryer until the moisture content was 1.0% by weight or less to obtain dry particles.
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