Toner comprising polyester, process for making the toner and uses thereof
AssigneeFujifilm Imaging Colorants Limited
InventorsDaniel Patrick Morris, John Dylan Morgan, Martin Russell Edwards, Miguel Angel Rodriguez-Vazquez, Mohammed Nawaz, Zoonia Mehmood
Life of this patent
Estimating the term…
Abstract
A process for preparing a toner comprising a binder resin and a colorant, wherein the binder resin comprises a polyester resin having an acid value (AV) greater than 5 mg KOH/g, the process comprising: providing an aqueous dispersion of self-dispersed polyester resin particles and associating the polyester resin particles by means of a change in the pH of the dispersion.
Claims15
A process for preparing a toner comprising a binder resin and a colorant, wherein the binder resin comprises a polyester resin having an acid value greater than 5 mg KOH/g, the process comprising:
- providing an aqueous dispersion of neutralised self-dispersed polyester resin particles and colorant particles stabilised by an ionic surfactant, wherein the acid groups on the polyester resin and the ionic surfactant in the dispersion are reversibly ionisable or de-ionisable;
- associating the polyester resin particles and colorant particles by means of a change in the pH of the dispersion which causes the neutralised acid groups of the polyester and ionic surfactant to convert from an ionic to a non-ionic state;
- and
- a further step of heating, stirring or heating and stirring the associated particles at a temperature from 5 to 25° C. below the glass transition temperature of the binder.
Dependencies are inferred from the claim text.