Encapsulated electrostatographic toner particles and a process for producing such toners
US5294513A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1992 |
| Grant date | Mar 15, 1994 |
| Priority date | — |
| Expiry date | Feb 3, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09328
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Encapsulated electrostatographic toner particles and a process for making toner particles. The toner particles comprise a pressure fixable core encapsulated in a pressure rupturable shell with the outer surface of the shell being hydrophobic. Preferably, the outer surface of the shell is rendered hydrophobic by having a thermosetting resin precipitated thereon. The process for producing electrostatographic toner particles comprises preparing a core material, encapsulating a discrete portion of the core material in a shell by interfacial polycondensation, and then treating the outer surfaces of the shells with a thermosetting resin to render them hydrophobic. This enables the particles to be formed as a free-flowing, dry powder without requiring costly spray drying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.