Process for producing toner for developing electrostatic images and apparatus therefor
US4782001A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1988 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | Mar 28, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B7/0865
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for producing toner particles for developing electrostatic latent images, comprising the steps of introducing colored solid particles containing a binder resin into a multi-division classifying zone divided into at least three sections by partitioning means, so that the particles are fallen along curved lines; collecting a coarse powder consisting primarily of coarse particles in a first divided section, a medium powder consisting primarily of particles having a particle size within a defined range in a second divided section and a fine powder consisting primarily of particles having a particle size smaller than the defined range in a third divided section; feeding the classified coarse powder to a pulverizing step; and introducing the pulverized powder into the multi-division classifying zone. An apparatus for practicing the process is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.