Patent ID: 6808851
Filing Date: 2004-10-26
Classification: C08J,G03G

Abstract:
A process of making an emulsion aggregation toner having a reduction of wax protrusions comprising:(i) blending a latex, an aqueous colorant dispersion, a wax dispersion and a gel latex, wherein the latex comprises a non-crosslinked resin suspended in an aqueous phase in the presence of an ionic surfactant and water, the aqueous colorant dispersion comprises a colorant, water, and an ionic surfactant, the wax dispersion comprises at least one wax having a molecular weight between about 500 and about 2,500, water, and an ionic surfactant, and the gel latex comprises crosslinked resin particles suspended in an aqueous phase in the presence of an ionic surfactant and water; (ii) mixing the above blend with a coagulant; (iii) heating the mixture below about, or about equal, to the glass transition temperature (Tg) of the non-crosslinked resin to form an aggregated suspension; (iv) adding a base to increase the pH; (v) heating to above about the glass transition temperature (Tg) of the non-crosslinked resin to coalesce the said aggregated suspension; (vi) lowering the pH with an acid; and (vii) cooling to about room temperature.