Production method of toner
US6335138B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 2000 |
| Grant date | Jan 1, 2002 |
| Priority date | — |
| Expiry date | Jan 7, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09725
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A production method of toner particles has steps of mixing a binder resin and a colorant, melting and kneading the mixture, pulverizing the kneaded material, and classifying the pulverized materials to give a colored resin particles. Then the colored resin particles are mixed with silica particles having an average primary particle size of 16 to 28 nm with the number of particles (A) that are less than 15 nm in particle size, the number of particles (B) that are between 15 and 30 nm in particle size and the number of particles (C) that are larger than 30 nm in particle size having the relation of (B)/(A)>4 and (B)/(C)>4. To obtain toner particles, the resultant mixture is heat-treated to make the colored resin particles spherical and to make the silica particles fixed on the surface of the colored resin particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.