Toner compositions and processes thereof
US5604076A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1996 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Feb 1, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0806
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for the preparation of toner compositions comprising: PA1 (i) preparing a latex or emulsion resin comprised of a polyester core encapsulated within a styrene based resin shell by heating said polyester emulsion containing an anionic surfactant with a mixture of monomers of styrene and acrylic acid, and with potassium persulfate, ammonium persulfate, sodium bisulfite, or mixtures thereof; PA1 (ii) adding a pigment dispersion, which dispersion is comprised of a pigment, a cationic surfactant, and optionally a charge control agent, followed by the sharing of the resulting blend; PA1 (iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates with a narrow particle size distribution; and PA1 (iv) heating said electrostatically bound aggregates above about the Tg of the resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.