Production process of toner for development of electrostatic latent image
US5952144A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Dec 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09392
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for producing a toner for development of electrostatic latent images, which is composed of colored polymer particles and has a low fixing temperature, good permeability through OHP and excellent shelf stability, by subjecting a monomer composition containing at least a polymerizable monomer and a colorant to suspension polymerization in an aqueous dispersion medium containing a dispersing agent comprises at least two steps of: (1) the first step of subjecting a monomer composition for core component containing at least one monomer for core component, which is capable of forming a polymer having a glass transition temperature not higher than 80.degree. C., and a colorant to suspension polymerization in the aqueous dispersion medium until the conversion of the monomer into the polymer reaches at least 80%, thereby preparing colored polymer particles serving as the core component; and (2) the second step of adding at least one monomer for shell component, which is capable of forming a polymer having a glass transition temperature higher than that of the polymer of the core component, or a monomer composition for shell component containing said monomer, and a water-soluble ra…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.