Electrostatic image-developing toner external additive, method for producing the same, and toner
An electrostatic charge image, external additive technology, applied in the direction of developer, electrography, optics, etc., can solve the problems of decreased fluidity of toner, difficulty in dispersing, and influence of toner chargeability, etc., and achieves excellent storage properties Effect
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Embodiment 1
[0078] The BET specific surface area obtained by hydrolyzing silane at high temperature is 200m 2 / g, a primary particle size of 10nm, and a bulk density of 45g / L fumed silica are subjected to the following treatment methods. 200 g of fumed silica was charged into a high-speed mixer (volume 10 L), and operated at a rotation speed of 1,500 rpm. When the rotation is stable, 25 g of short-chain siloxane from which water and methanol have been removed from the hydrolyzate of dimethyldimethoxysilane as a hydrophobizing agent, 0.5 g of hexamethyldisilazane and 550g of methanol was mixed, and the bulk density of the obtained wet granulation was 352g / L. Next, the methanol component of the obtained wet granulated product was removed by a dryer to obtain a dry granulated product with a loose bulk density of 210 g / L. Next, 100 g of the dried granulated material was put into a 2 L flask, and heated at 250° C. for 2.5 hours. The bulk density of the toner external additive composed of the...
Embodiment 2
[0080] The BET specific surface area obtained by hydrolyzing silane at high temperature is 200m 2 / g, a primary particle size of 10nm, and a bulk density of 45g / L fumed silica are subjected to the following treatment methods. 200 g of fumed silica was charged into a high-speed mixer (volume 10 L), and operated at a rotation speed of 1,500 rpm. When the rotation was stable, 75 g of short-chain siloxane from which water and methanol were removed from the hydrolyzate of dimethyldimethoxysilane as a hydrophobizing agent was sprayed for 20 seconds, and then 300 g of pure water was sprayed for 60 seconds. The bulk density of the obtained wet granulated material was 362 g / L. Next, the obtained wet granulated product was dehydrated with a drier to obtain a dry granulated product having a loose bulk density of 198 g / L. Next, 100 g of the dried granulated material was put into a 2 L flask, and heated at 250° C. for 2.5 hours. The bulk density of the toner external additive composed o...
Embodiment 3
[0082] The BET specific surface area obtained by hydrolyzing silane at high temperature is 200m 2 / g, a primary particle size of 10nm, and a bulk density of 45g / L fumed silica are subjected to the following treatment methods. 200 g of fumed silica was charged into a high-speed mixer (volume 10 L), and operated at a rotation speed of 1,500 rpm. When the rotation is stable, 12 g of pure water is sprayed for 10 seconds. Then, a mixture obtained by mixing 32 g of hexamethyldisilazane and 450 g of methanol as a hydrophobizing agent was sprayed over 2 minutes. The bulk density of the obtained wet granulated material was 364 g / L. Next, methanol and water in the obtained wet granulated product were removed using a drier to obtain a dry granulated product with a bulk density of 220 g / L. Next, 100 g of the dried granulated material was put into a 2 L flask, and heated at 250° C. for 2.5 hours. The bulk density of the toner external additive composed of the obtained granulated silica...
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