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US 5,476,745 AGranted
Process for producing toner particles
AssigneeCanon Kabushiki Kaisha
InventorsTatsuya Nakamura, Ichiro Ohsaki, Takayuki Nagatsuka, Makoto Kanbayashi, Tatsuhiko Chiba
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Abstract
The present invention provides a process for producing a toner having little remaining polymerizable monomer in it by suspension polymerization. During the latter half of the polymerization reaction, the remaining polymerizable monomers and the aqueous medium are evaporated or removed while supplying the aqueous medium, saturated vapor of the aqueous medium, saturated vapor of a water-soluble solvent, or water-soluble gas to maintain the ratio of solid-liquid constant.
Claims36
A process for producing toner particles, comprising the steps of;
- introducing into a first aqueous medium a polymerizable monomer composition containing a polymerizable monomer, to carry out granulation;
- subjecting particles of the granulated polymerizable monomer composition to polymerization reaction;
- adding to the reaction system a member selected from the group consisting of a second aqueous medium, a water-soluble solvent and a water-soluble gas;
- and
- evaporating from the reaction system the remaining polymerizable monomer, and the first aqueous medium, at the latter half of polymerization reaction or after the completion of polymerization reaction, whereby the remaining polymerizable monomer is removed from the particles.
2 more elements
Dependencies are inferred from the claim text.