Process for production of liquid developer, and liquid...

G - Physics – 03 – G

Patent

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G03G 9/12 (2006.01)

Patent

CA 2610287

Disclosed is a process for production of a liquid developer for use in electrophotograph or electrostatic recording by coacervation method. The process can produce a liquid developer in which a coloring agent (e.g., a pigment) is included completely within a resin particle by distillation of a solvent while retaining the state where the coloring agent are finely dispersed and the resulting colored resin particle is small in particle size and has an excellent dispersion stability, and which has excellent optical properties. The process comprises preparing a mixture containing a pigment, a resin having a fixability, a solvent (A) which can dissolve the resin therein, a hydrocarbon solvent (B) which cannot dissolve the resin therein and has an SP value lower than that of the solvent (A), at least one dispersing agent (A) which is soluble in both of the solvents (A) and (B), and at least one dispersing agent (B) which is soluble in the solvent (A) but insoluble or poorly soluble in the solvent (B), and distilling away the solvent (A) from the mixture to cause the resin dissolved in the mixture to precipitate, whereby a colored resin particle having the pigment included therein is dispersed in the solvent (B).

L~invention concerne un processus de production d~un développeur liquide pour une utilisation dans l~enregistrement électrophotographique ou électrostatique par un procédé de coacervation. Le processus permet d~obtenir un développeur liquide dans lequel un agent colorant (par exemple un pigment) est inclus complètement dans une particule de résine par distillation d~un solvant tout en conservant l~état dans lequel l~agent colorant est finement dispersé et la particule de résine colorée résultante présente une faible taille de particule et présente une excellente stabilité de dispersion et d~excellentes propriétés optiques. Le processus consiste à préparer un mélange contenant un pigment, une résine d~une certaine fixabilité, un solvant (A) capable de dissoudre la résine, un solvant hydrocarbure (B) incapable de dissoudre la résine et ayant une valeur SP inférieure à celle du solvant (A), au moins un agent dispersif (A) qui est soluble à la fois dans le solvant (A) et le solvant (B), et au moins un agent dispersif qui est soluble dans le solvant (A) mais insoluble ou faiblement soluble dans le solvant (B), et à distiller le solvant (A) par rapport au mélange pour provoquer la précipitation de la résine dissoute dans le mélange, pour alors disperser une particule de résine colorée englobant le pigment dans le solvant (B).

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