Non-magnetic mono-component developer
US5981132A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Dec 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09708
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
1. A non-magnetic mono-component developer comprising: PA1 toner particles containing at least a binder resin and a coloring agent and having a volume mean particle size D of 4 to 10 .mu.m; PA1 first inorganic fine particles having a mean primary particle size of 1 to 40 nm, the quantity of addition of the first inorganic fine particles being 0.1 to 2% by weight relative to the quantity of the toner particles; PA1 second inorganic fine particles having a mean primary particle size of 40 to 100 nm and not less than 10 nm larger than the first inorganic fine particles, the quantity of addition of the second inorganic fine particles being 0.1 to 2.5% by weight relative to the quantity of the toner particles, the total quantity of addition of the first and second inorganic fine particles being 0.8 to 3% by weight relative to the quantity of the toner particles; and PA1 third inorganic fine particles having a mean primary particle size of 100 nm to 1000 D/16 nm and not less than 10 nm larger than the second inorganic fine particles, the quantity of addition of the third inorganic fine particles being 0.3 to 3% by weight relative to the quantity of the toner particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.