Toner for use in compositions for developing latent electrostatic images, method of making the same, and liquid composition using the improved toner
US5192638A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1991 |
| Grant date | Mar 9, 1993 |
| Priority date | — |
| Expiry date | Sep 9, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2927
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid composition for developing latent electrostatic images comprising toner particles associated with a pigment dispersed in a nonpolar liquid. The salient feature of the invention is that the toner particles are formed with a plurality of fibers or tendrils from a thermoplastic polymer and carry a charge of a polarity opposite to the polarity of the latent electrostatic image. The polymer is insoluble or insolvatable in the dispersant liquid at room temperature. The toner particles are formed by plasticizing the polymer and pigment at elevated temperture and then either permitting a sponge to form and wet-grinding pieces of the sponge or diluting the plasticized polymer-pigment while cooling and constantly stirring to prevent the forming of a sponge while cooling. When cool, the diluted composition will have a concentation of toner particles formed with a plurality of fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.