External additive for electrostatically charged latent image developing toner
US6316155A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Mar 13, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/62
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An external additive for electrostatically charged latent image developing toner is provied. The additive includes spherical hydrophobic fine silica particles having primary particles having a particle diameter of from 0.01 to 5 .mu.m, which fine silica particles fulfill the following conditions (i) and (ii): (i) when an organic compound which is liquid at room temperature and has a dielectric constant of from 1 to 40 F/m and fine silica particles are mixed in a weight ratio of 5:1 and shaken, the fine silica particles disperse uniformly in the organic compound; and (ii) the quantity of primary particles remaining as primary particles when methanol is evaporated under heating by means of an evaporator from a dispersion prepared by dispersing the fine silica particles in methanol and thereafter the particles are held at a temperature of 100.degree. C. for 2 hours, represents at least 20% of the quantity of primary particles originally present. The external additive does not react or has no interaction with an organic photoreceptor and therefore change in quality does not occur or the photoreceptor is not scraped. Furthermore, it has a good flowability and therefore adhesion of a ton…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.