Process for producing toners for use in electrophotography

Details Process for producing toners for use in electrophotography Process for producing toners for use in electrophotography

G - Physics

03

G

96/53

G03G 9/08 (2006.01) G03G 9/087 (2006.01)

Patent

CA 1313968

27571-19 Abstract of the Disclosure Disclosed is a process for producing toners for use in electrophotography which comprises: stirring a mixture of a radical polymerizable liquid monomer and carbon black in the presence of a peroxide polymerization initiator, thereby to disperse the carbon black uniformly and minutely in the monomer; adding an azobisnitrile polymerization initiator to the resultant monomer composition; suspension polymerizing the monomer in an aqueous medium: and recovering and drying the resultant spherical polymer particles. In a preferred manner, the suspension polymerization is carried out in an aqueous medium which contains polyvinyl alcohol as a suspending agent, and after the polymerization, the polyvinyl alcohol remaining on the polymer particles is saponified or nitrated to produce a toner with a higher quality.

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