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US 7,396,627 B2Granted
Method of preparing a toner, developer including the toner, container containing the toner, and image forming method and process cartridge using the toner
AssigneeRicoh Company, Ltd.
InventorsNaohiro Watanabe, Chiaki Tanaka, Masayuki Ishii, Kei Naitoh, Takuya Saito
Life of this patent
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Abstract
A method including contacting a toner including: a binder resin including an unsaturated carboxylic acid derivative monomer; a vinyl polymerizing monomer; and a colorant; to a supercritical fluid or a sub-critical fluid to remove the unsaturated carboxylic acid derivative monomer.
Claims35
A method comprising:
- contacting a polymerized toner comprising a binder resin that comprises polymerized units of at least one unsaturated carboxylic acid monomer with at least one of a supercritical fluid and a sub-critical fluid to remove unpolymerized unsaturated carboxylic acid monomer, wherein the polymerized toner has a volume-average particle diameter (Dv) of from 2 μm to 8 μm, and a ratio (Dv/Dn) of the volume-average particle diameter (Dv) to a number-average particle diameter (Dn) of not greater than 1.25.
Dependencies are inferred from the claim text.