Use of high percent solids for improved liquid toner preparation
US4923778A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1988 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Dec 23, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Process for preparation of toner particles for electrostatic liquid developers utilizing a single vessel wherein (A) a thermoplastic resin and hydrocarbon liquid having a Kauri-butanol value of less than 120 at a total of solids of at least 22% by weight are dispersed in the vessel by moving particulate media (crating shear) at elevated temperature to plasticize and liquify the resin, (B) while the particulate media are maintained in continuous motion the dispersion is cooled whereby the resin precipitates in the form of toner particle having an average by area particle size of 10 .mu.m or less, and (C) the particulate media are removed. Liquid electrostatic developers are prepared by the addition of a charge director compound. The liquid developers are prepared in a shorter time that previously known processes. The liquid developers are useful for preparation of copies and proofs of various colors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.