Process for preparation of liquid toners for electrostatic imaging using polar additive
US4631244A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1986 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Feb 18, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Process for preparation of toner particles for electrostatic imaging comprising PA1 A. dispersing at an elevated temperature in a vessel a thermoplastic resin, a dispersant nonpolar liquid having a Kauri-butanol value of less than 30 and optionally a colorant, the temperature being maintained to plasticize and liquify the resin and below that at which the nonpolar liquid degrades and any component decomposes; PA1 B. cooling the dispersion, either PA2 (1) with or without stirring to form a gel or solid mass, the shredding and grinding the mass by means of particulate media in the presence of additional liquid; PA2 (2) with stirring to form a viscous mixture and grinding by means of particulate media in the presence of additional liquid; or PA2 (3) while grinding the particulate media thereby preventing formation of a gel or solid mass in the presence of additional liquid, and PA1 C. separating the dispersion of toner particles, average by area particle size less than 10 .mu.m, from particulate media, the improvement whereby there is present, at least during the grinding in step B, 0.5 to 99% by weight of a polar additive having a Kauri-butanol value of at least 30, the percentage ba…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.