Patent ID: 6630276
Filing Date: 2003-10-07
Classification: B82Y,C01P,C09C,G03G,Y10T

Abstract:
An external additive for a toner, having an average primary particle diameter not greater than 100 nm and comprising:an inorganic particulate material; and a hydrophobizing agent which is present on the inorganic particulate material in an amount of Ws by weight and present as a free hydrophobizing agent in an amount of Wf by weight, wherein a residual ratio defined as a ratio {Ws/(Ws+Wf)}Ã—100 is from 40 to 98.5%, wherein at least one of a compound having an organopolysiloxane structure and a compound having a ring siloxane structure is detected when the external additive is analyzed by a pyrolysis gas chromatography mass spectroscopy method after the external additive is washed with chloroform.