Low shear toner aggregation processes
US5650255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1996 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Sep 3, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0819
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An in situ chemical process for the preparation of toner comprised of PA1 (i) the provision of a latex, which latex is comprised of polymeric resin particles, an ionic surfactant and a nonionic surfactant; PA1 (ii) providing a pigment dispersion, which dispersion is comprised of a pigment solution, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant, and optionally a charge control agent; PA1 (iii) mixing said pigment dispersion with said latex with a stirrer equipped with an impeller, stirring at speeds of from about 100 to about 900 rpm for a period of from about 10 minutes to about 150 minutes; PA1 (iv) heating the above resulting blend of latex and pigment mixture to a temperature below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates; PA1 (v) adding further aqueous ionic surfactant or stabilizer in the range amount of from about 0.1 percent to 5 percent by weight of reactants to stabilize the above electrostatically bound toner size aggregates; PA1 (vi) heating said electrostatically bound toner sized aggregates above about the Tg of the resin to form toner size particl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.