Positively chargeable toner, image forming method and image forming apparatus
US6235441A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1999 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Dec 17, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09758
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A positively chargeable toner suitable to be carried on a cylindrical developer-carrying member having a resinous surface for developing an electrostatic latent image is formed from a composition including a binder resin, an imidazole compound and a colorant. The binder resin comprises at least one member selected from the group consisting of (i) a mixture of vinyl resin having a carboxyl group and a vinyl resin having a glycidyl group, (ii) a vinyl resin having both a carboxyl group and a glycidyl group, and (iii) a vinyl resin having a carboxyl group and a glycidyl group in a form reacted with each other. The imidazole compound is a compound having an imidazo unit represented by formula (1) below: ##STR1## wherein R.sub.1 -R.sub.4 independently denote hydrogen or a substituent as specified. In some cases, two or more such imidazole units can be included in a combined form to provide the imidazole compound. The imidazole compound is effective for promoting a crosslinking reaction between the carboxyl group and the glycidyl group to provide the toner with improved fixability and anti-offset property in combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.