Toner, developer, toner cartridge, process cartridge, image forming apparatus, and image forming method
A toner cartridge and toner image technology, applied in the directions of developer, electrography, optics, etc., can solve the problems of fixed image density changes, toner particles adhered to non-image areas, etc., and achieve uneven distribution inhibitory effect
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preparation example Construction
[0124]The preparation method of the specific silica particles is not particularly limited as long as the method can obtain silica particles having an average particle diameter of 70 nm to 400 nm, a specific gravity of 1.0 to 1.9, and an average circularity of 0.5 to 0.9. For example, specific silica particles can be produced by a method using water glass as a raw material to obtain a silica sol; or a so-called wet method in which a silicon compound typified by alkoxysilane is used as a raw material And form particles by sol-gel method.
[0125] However, for the dry method of producing silica particles by calcining silica followed by pulverization and classification, the specific gravity of such silica particles generally exceeds 1.9, and thus cannot be considered from the viewpoint of specific gravity. Specific silica particles are produced. On the other hand, for the method of forming particles by a sol-gel method using a silicon compound typified by alkoxysilane as a raw ma...
Embodiment 1
[0230]
[0231] [Preparation of Toner Particles]
[0232] (Preparation of polyester resin dispersion)
[0233] · Ethylene glycol (manufactured by Wako Pure Chemical Industries): 37 parts
[0234] ・Neopentyl glycol (manufactured by Wako Pure Chemical Industries): 65 parts
[0235] 1,9-nonanediol (manufactured by Wako Pure Chemical Industries): 32 parts
[0236] · Terephthalic acid (manufactured by Wako Pure Chemical Industries): 96 parts
[0237] The above-mentioned monomers were placed in a flask; the temperature was raised to 200° C. within one hour; after it was confirmed that the inside of the reaction system had been uniformly stirred, 1.2 parts of dibutyltin oxide was added thereto. In addition, while distilling off the formed water, the temperature was raised from 200°C to 240°C in 6 hours, and the dehydration condensation reaction was continued at 240°C for 4 hours, thereby obtaining an acid value of 9.4 mg-KOH / g , A polyester resin having a weight average molecul...
Embodiment 2 to 8 and comparative example 1 to 5
[0283] Toners (2) to (8) of Examples 2 to 8 and toners (101) to (105) of Comparative Examples 1 to 5 were prepared in the same manner as the preparation of toner (1), except The point is that the silica particles (1) added externally to the toner particles (1) are changed to silica particles (2) to (8) and silica particles (101) to (105 ).
[0284] Physical properties of the obtained silica particles (2) to (8) and silica particles (101) to (105) were examined in the same manner as the silica particles (1).
[0285] The average particle diameter (D 50V ), average circularity [100 / SF2] and specific gravity are shown in the column of "Physical Properties" under "Silica Particles" in Table 1.
[0286] Further, Developers (2) to (8) and Developers (101) to (105) were prepared in the same manner as the preparation of Developer (1), except that Toners (2) to (8) and toners (101) to (105) replace toner (1).
[0287] Stain evaluation was performed in the same manner as in Example ...
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