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    • 9. 发明专利
    • PRODUCTION OF CAPSULE TYPE PARTICLE
    • JPH0871405A
    • 1996-03-19
    • JP20680894
    • 1994-08-31
    • DAINIPPON INK & CHEMICALS
    • TAKAYANAGI HITOSHISAKURAI HIROKO
    • G03G9/08B01J13/00B01J13/08
    • PURPOSE: To inhibit fine particles having particle size of submicron or less and water- soluble resins from being produced as by-products in the production of capsule type particles and to prevent reduction in the amount of electrostatic charge of the toner and generation of odor from the toner at the time of using the particles as a toner by using an inorganic basic substance for neutralizing a resin which is used for phase- inversion emulsification and has acidic groups and also can be provided with anionic self water-dispersibility by neutralizing it. CONSTITUTION: In this production, as the basic substance used for the neutralization by which a resin having acidic groups neutralized with a basic substance and anionic self water-dispersibility can be obtained, an inorganic basic substance is used. Then, a mixed composition which consists of this resin having anionic self water-dispersibility, an organic solvent and a colorant as the essential components is added to an aqueous medium and subjected to phase-inversion emulsification. Thus, resin particles, in which the colorant is encapsulated, can be formed in the aqueous medium. Examples of the acidic groups in this resin include carboxyl, phosphate, sufonate and sulfate groups, etc. Examples of the inorganic basic substance include hydroxides of alkali and alkaline earth metals and ammonia.