Title:
HYDROPHOBIC SILICA FINE PARTICLES AND ELECTROPHOTOGRAPHIC TONER COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2010/038538
Kind Code:
A1
Abstract:
Provided are silica fine particles which have small primary particle diameters and are useful as an external additive for a toner. The silica fine particles do not contain coarse agglomerate particles, which are causative of lowering in the dispersibility in a toner and/or in the fluidity of a toner, and rarely cause the separation from a toner. The silica fine particles are therefore excellent in the uniform dispersibility in a toner and in the effect of imparting fluidity to a toner, and can inhibit the occurrence of white spots on a printed image. Hydrophobic silica fine particles obtained by subjecting hydrophilic silica fine particles which are prepared by a gas-phase process and have a mean primary particle diameter of 20 to 100 nm to hydrophobization with either hexamethyldisilazane or a polysiloxane represented by general formula (I), characterized in that the content of agglomerate particles having volume-based particle diameters of 1.5 μm or above is less than a prescribed value as determined by the laser diffraction method.
Inventors:
KANEEDA MASANOBU (JP)
INOUE AKIRA (JP)
INOUE AKIRA (JP)
Application Number:
PCT/JP2009/063494
Publication Date:
April 08, 2010
Filing Date:
July 29, 2009
Export Citation:
Assignee:
NIPPON AEROSIL CO LTD (JP)
KANEEDA MASANOBU (JP)
INOUE AKIRA (JP)
KANEEDA MASANOBU (JP)
INOUE AKIRA (JP)
International Classes:
C01B33/18; G03G9/08
Foreign References:
| JP2004145325A | 2004-05-20 | |||
| JP2000258947A | 2000-09-22 | |||
| JP2004212520A | 2004-07-29 | |||
| JP2006206413A | 2006-08-10 | |||
| JP2006206414A | 2006-08-10 | |||
| JP2004145325A | 2004-05-20 | |||
| JP2006099006A | 2006-04-13 | |||
| JP2007034224A | 2007-02-08 | |||
| JP2006206414A | 2006-08-10 | |||
| DE974793C | 1961-04-27 | |||
| DE974974C | 1961-06-22 | |||
| DE909339C | 1954-04-15 | |||
| JP3229174B2 | 2001-11-12 | |||
| JPS6150882B2 | 1986-11-06 | |||
| JPS572641B2 | 1982-01-18 | |||
| JPS62171913A | 1987-07-28 | |||
| JP2008256383A | 2008-10-23 | |||
| JP2009021539A | 2009-01-29 |
Other References:
See also references of EP 2357157A4
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi (JP)
Takeshi Shigeno (JP)
Takeshi Shigeno (JP)
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