Zeon Corporation

Michito Horie

Hisashi Kurokawa

A production method of a toner includes a suspension process in which a polymerizable monomer composition is dispersed in an aqueous dispersion medium; and a polymerization process in which suspension polymerization is performed with the suspension in the presence of a polymerization initiator to obtain colored resin particles. In the suspension process an inhibitor of small diameter microparticle production is contained in the aqueous dispersion medium. A minimum reaction activation energy Eof the inhibitor of small diameter microparticle production is 7 kcal/mol or less and an octanol-water partition coefficient log P is 2 or less. The minimum reaction activation energy Eis a minimum value of a reaction activation energy 'E' which is required when a phenylpropane radical represented by the following Formula 1 acts on the inhibitor of small diameter microparticle production: 

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Tokyo, Japan

Michito Horie