Negatively chargable toner for electrophotography
US5612161A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1995 |
| Grant date | Mar 18, 1997 |
| Priority date | — |
| Expiry date | Dec 20, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09783
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A negatively chargable toner for electrophotography, comprising a binder, a coloring agent and a charge control agent, the charge control agent comprising a copolymer of 1 to 30% by weight of a sulfoalkyl (meth)acrylic acid monomer represented by a specific chemical formula and 99 to 70% by weight of other vinyl monomer copolymerizable therewith, the amount of the charge control agent being from 0.1 to 10 parts by weight for 100 parts by weight of the binder. The toner can be charged immediately, can stably maintain the toner properties, in particular, under the conditions of high temperatures and high humidities, can produce a good image that is free from toner scattering, fogging and the like, and can be made into a color toner capable of clearly forming a colored image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.