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Title:
SURFACE-MODIFIED SILICA POWDER AND METHOD FOR PRODUCING THE SAME, AS WELL AS TONER COMPOSITION FOR ELECTROPHOTOGRAPHY
Document Type and Number:
WIPO Patent Application WO/2012/111452
Kind Code:
A1
Abstract:
Surface-modified silica powder, wherein silica powder has been surface treated using one, two or more compounds (A) and aminosilane (B), is characterized in that the immobilization rate of compound (A) and aminosilane (B) is a total of 50% or greater, the hydrophobic percentage is 80% or greater, and the frictional charge is 200 µC/g or less by absolute value. When used as an external additive, the surface-modified silica powder of this invention is capable of stabilizing many properties, including fluidity and electrostatic properties, and greatly improving the problems of fogging and a reduction in the image, without greatly reducing properties of the developer, and the like.

Inventors:
AMANO YUKI (JP)
NAITO NAOHIRO (JP)
OKADA HISAO (JP)
OKUBO MASAKI (JP)
AOKI YOSHIKAZU (JP)
OTSUKA HIDEYUKI (JP)
Application Number:
JP2012/052445
Publication Date:
August 23, 2012
Filing Date:
February 03, 2012
Export Citation:
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Assignee:
NIPPON AEROSIL CO LTD (?1630913, JP)
HODOGAYA CHEMICAL CO LTD (?1050011, JP)
AMANO YUKI (JP)
NAITO NAOHIRO (JP)
OKADA HISAO (JP)
OKUBO MASAKI (JP)
AOKI YOSHIKAZU (JP)
OTSUKA HIDEYUKI (JP)
International Classes:
C01B33/18; G03G9/08; G03G9/087
Domestic Patent References:
WO2001021529A12001-03-29
Foreign References:
JP2009234875A2009-10-15
JP2008545606A2008-12-18
Other References:
See also references of EP 2676930A4
Attorney, Agent or Firm:
SUDA, MASAYOSHI (?1700013, JP)
Masayoshi Suda (?1700013, JP)
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Claims: