Control of particle growth with complexing agents

Details Control of particle growth with complexing agents Control of particle growth with complexing agents

G - Physics

03

G

G03G 9/08 (2006.01)

Patent

CA 2541055

A method of making particles suitable for use as toners includes forming a mixture of sulfonated polyester resin, a colorant dispersion and optionally a wax dispersion, homogenizing the mixture, adding a coagulant to the mixture to aggregate the mixture to form aggregated particles, and coalescing the aggregated particles to form coalesced particles. In the method, when a predetermined average particle size is achieved during the aggregation and/or coalescing step, a complexing agent that complexes with ions of the coagulant is added in an amount effective to substantially halt any further particle growth. The complexing agent is believed to halt further growth by complexing with free coagulant ions still in the solution.

Une méthode de fabrication de particules pouvant servir de toners comprend la formation d'un mélange de résine de polyester sulfoné, une dispersion de colorant et éventuellement une dispersion de cire, l'homogénéisation du mélange, l'ajout d'un coagulant au mélange pour agréger le mélange afin de former des particules agrégées, et la coalescence des particules agrégées pour former des particules coalescées. Dans la méthode, quand on obtient une taille de particule moyenne prédéterminée durant l'étape d'agrégation et/ou de coalescence, un agent complexant qui forme un complexe avec les ions de l'agent coagulant est ajouté en une quantité efficace pour stopper sensiblement toute croissance supplémentaire des particules. L'agent complexant est censé stopper la croissance supplémentaires par complexation avec des ions coagulants libres qui se trouvent dans la solution.

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