Fine metal oxide powder having high dispersibility and toner composition comprising the same
AssigneeNippon Aerosil Co., Ltd.
InventorsMasamichi Murota, Toshio Morii, Hirokuni Shirono
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Abstract
Regarding the metal oxide fine powder, which is used as the additive of a powder material and is hydrophobic treated on the surface, the peak of the particle size distribution of the agglomerated particle is made to be less than the same level of average size of the powder material, so that said powder has high dispersibility in the powder material. When this metal oxide fine powder is used as the external additive, such as the toner for the, electronic photograph, the standup of the electrostatic charge, the image quality, and the cleaning characteristic are improved remarkably.
Claims11
(after amendment) a metal oxide fine powder having high dispersibility in a powder material, which is hydrophobic-treated on the surface and used as an additive of the powder material,
- wherein, a primary particle of said powder having the average size of less than 300 nm (nano meter) and the specific surface area of 10-400 m2/g by the bet method is hydrophobic-treated to have the hydrophobicity of more than 30%, and
- said hydrophobic-treated powder is pulverized or pulverizing processed to have a peak of a particle size distribution containing more than 55% of agglomerated particles and being in the range of 0.1 to 10 μm.
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Dependencies are inferred from the claim text.