| Nippon Aerosil Co., Ltd. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120085978 | SURFACE-MODIFIED METAL OXIDE POWDER AND PROCESS FOR PRODUCING SAME - Provided is a surface-modified metal oxide powder obtained by treating surface of a metal oxide powder, wherein a ratio (A/B) of an initial triboelectrostatic charge amount (A) at the time of one minute after dispersion of the surface-modified metal oxide powder into a ferrite carrier to a triboelectrostatic charge amount (B) with the lapse of 30 minutes in addition is in the range between 1.0 and 2.0, and the triboelectrostatic charge amount (B) after the lapse of time is in the range between −300 and +300 μC/g. The surface-modified metal oxide powder of the present invention has a weaker charging property and a better stability over time of a triboelectrostatic charge amount than a conventional one; and thus, when this powder is used as an external additive, various properties including flowability and electrical charging can be stabilized, and in addition, problems such as fogging and image deterioration can be drastically remedied without significantly deteriorating characteristics as a developer and the like. | 04-12-2012 |
| 20110177446 | HYDROPHOBIC SILICA MICROPARTICLES AND COMPOSITION FOR ELECTROPHOTOGRAPHIC TONER - Provided are silica microparticles having a fine primary particle size suitable for an external toner additive, the microparticles including no bulky agglomerated particles responsible for a decrease in dispersibility into toner and fluidity of toner. The microparticles are capable of preventing detachment from toner, and are superior in effects of imparting uniform dispersibility and fluidity, thereby preventing a white point on printed images from occurring. The silica microparticles are characterized in that the silica microparticles are produced using hexamethyl disilazane or organo-polysiloxane by carrying out hydrophobization of hydrophilic silica microparticles having an average primary particle size of from 20 to 100 nm produced by a gas phase method, and that a ratio of agglomerated particles having a particle size of 1.5 μm or more is less than a predetermined value by determining using laser diffractometry by a volume-based particle size measurement of the particle. | 07-21-2011 |
