Toner production method

摘要

A method for producing a toner that comprises toner particles, each of which comprises a binder resin, which comprises a resin (A) capable of forming a crystalline structure, and a colorant, the method including: a pressure holding step of, after preparing toner particles, holding the toner particles for 5 minutes or more at a pressure of 2.0 MPa or more under conditions of a temperature T1 (° C.) represented by formula (1):
20≦T1≦Tp2  (1)
(wherein, Tp2 represents the onset temperature of the maximum endothermic peak derived from the resin (A)), wherein a peak temperature Tp1 of the maximum endothermic peak derived from the resin (A) during the first temperature rise of the toner particles as determined by differential scanning calorimetric measurement is 50° C. to 90° C.

主权项

1. A toner production method, comprising:
(i) a step of producing untreated toner particles, each of which comprises a binder resin and a colorant, the binder resin containing a resin (A) capable of forming a crystalline structure; and (ii) a pressure treatment step of obtaining treated toner particles by holding the untreated toner particles for 5 minutes or more in a state in which pressure of 2.0 MPa or more is applied to the untreated toner particles under conditions of a temperature T1 (° C.) defined by formula (1):
20≦T1≦Tp2  (1) (wherein, Tp2 represents an onset temperature (° C.) of the maximum endothermic peak derived from the resin (A) on an endothermic curve during a first temperature rise of the untreated toner particles as determined by differential scanning calorimetric measurement), wherein a peak temperature Tp1 of the maximum endothermic peak derived from the resin (A) on the endothermic curve during the first temperature rise of the untreated toner particles as determined by differential scanning calorimetric measurement is from at least 50° C. to not more than 90° C., and wherein the untreated toner particles are obtained by any one of (I) to (VI): (I) the untreated toner particles are obtained by performing,
a step of obtaining a resin composition by dissolving or dispersing the binder resin comprising the resin (A) and the colorant in an organic solvent able to dissolve the binder resin;a step of obtaining a dispersion by dispersing the resin composition in a dispersion medium comprising carbon dioxide at from at least 1.0 MPa to not more than 20.0 Mpa;a step of removing the organic solvent from the dispersion; anda step of reducing a pressure to atmospheric pressure, (II) the untreated toner particles are obtained by performing,
a step of obtaining a resin composition by dissolving or dispersing the binder resin comprising the resin (A) and the colorant in an organic solvent able to dissolve the binder resin;a step of obtaining a dispersion by dispersing the resin composition in an aqueous medium; anda step of removing the organic solvent from the dispersion via the aqueous medium, (III) the untreated toner particles are obtained by performing,
a step of obtaining a binder resin fine particle dispersion by dispersing the binder resin comprising the resin (A) in an aqueous medium or an organic solvent that does not dissolve the binder resin;a step of obtaining a colorant fine particle dispersion by dispersing the colorant in aqueous medium or an organic solvent that does not dissolve the binder resin;a step of forming aggregated particles by mixing the binder resin fine particle dispersion and the colorant fine particle dispersion; anda step of heating the aggregated particles at a temperature equal to or higher than a melting point or a glass transition temperature of the binder resin to fuse the aggregated particles, (IV) the untreated toner particles are obtained by performing,
a step of obtaining a polymerizable monomer composition by mixing a polymerizable monomer, the resin (A) and the colorant;a step of forming liquid droplets of the polymerizable monomer composition by dispersing the polymerizable monomer composition in an aqueous medium comprising a dispersion stabilizer; anda step of polymerizing the polymerizable monomer comprised in liquid droplets of the polymerizable monomer composition, (V) the untreated toner particles are obtained by performing,
a step of obtaining a polymerizable monomer composition by mixing a polymerizable monomer, a polymerizable monomer that is a precursor of the resin (A), and the colorant;a step of forming liquid droplets of the polymerizable monomer composition by dispersing the polymerizable monomer composition in an aqueous medium comprising a dispersion stabilizer; anda step of polymerizing the polymerizable monomer comprised in the polymerizable monomer composition, and (VI) the untreated toner particles are obtained by performing,
a step of obtaining a kneaded product by melting and kneading the binder resin comprising the resin (A) and the colorant; anda step of pulverizing the kneaded product.