Toner for developing electrostatic image comprising color resin particles having an irregular shape
US5219697A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Mar 8, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner for developing an electrostatic image, comprising color resin particles and a particulate additive. The color resin particles contain at least a coloring agent and a binding resin. The color resin particles possess irregular surfaces but not breaks, and the irregularity may be formed by depositing and fixing onto the surface fine resin particles having an average particle size in a range of 1/200 to 1/10 of the color resin particle size. A particulate additive has an average particles size of not more than 1/10 of volume average particle size of the color resin particles. The BET specific surface area of the toner changes by 20% or less before and after the forced stirring of the toner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.