External additive for toner for electrophotography, toner for electrophotography, double-component developer for electrophotography, image forming process using the toner, and image-forming apparatus using the toner

An external additive for a toner for electrophotography which contains oxide fine particles which contain silicon, in which the oxide fine particles have a primary particle diameter of 30nm to 300nm in number average, a standard deviation sigma of a particle size distribution of the primary particle...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	UMEMURA, KAZUHIKO, NAKAYAMA, SHINYA, SUGIURA, HIDEKI, MOCHIZUKI, SATOSHI, ASAHINA, YASUO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES CHEMISTRY CINEMATOGRAPHY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F COMPOUNDS THEREOF DYES ELECTROGRAPHY ELECTROPHOTOGRAPHY HOLOGRAPHY INORGANIC CHEMISTRY MAGNETOGRAPHY METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-METALLIC ELEMENTS PAINTS PHOTOGRAPHY PHYSICS POLISHES PREPARATION OF CARBON BLACK TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
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Beschreibung
Zusammenfassung:	An external additive for a toner for electrophotography which contains oxide fine particles which contain silicon, in which the oxide fine particles have a primary particle diameter of 30nm to 300nm in number average, a standard deviation sigma of a particle size distribution of the primary particle diameter satisfies a relation of: R/4 ≤ sigma ≤ R, in which the R expresses the primary particle diameter, the oxide fine particles are substantially spherical having a circularity SF1 defined as equation (1) of 100 to 130 and a circularity SF2 defined as equation (2) of 100 to 125; SF1 = (L /A) x( pi /4) x 100 SF2 = (P /A) x (1/4 pi ) x 100 in the equations, "L" expresses the absolute maximum length of the oxide fine particles; "A" expresses a projected area of the oxide fine particles; and "P" expresses a maximum perimeter of the oxide fine particles.