Negatively chargeable toner with specified fine particles added externally
US5776646A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1997 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09708
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to: PA1 (1) negatively chargeable toner particles with inorganic fine particles externally added thereto, the inorganic fine particles having a specified number-mean particle size and a specified chargeability, and PA1 (2) toner particles with silica fine particles and titania fine particles added to the toner particles in specified quantities and respectively having a specified number-mean particle size and a specified degree of hydrophobicity and, in combination therewith, inorganic particles having a specified number-mean particle size added to the toner particles. The toner of the present invention has good environmental stability, non-sticking characteristic, and good storage stability, and is capable of forming good images without aggregation noise and free of fogging after repetition of copy. The toner is suitable for full-color image formation in particular.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.