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US 8,557,491 B2Granted
Toner, developer, toner container, process cartridge, and image forming method
AssigneeRicoh Company, Ltd.
InventorsTsuyoshi Sugimoto, Naohito Shimota, Hiroshi Yamashita, Naohiro Watanabe, Shinichi Wakamatsu, Masaki Watanabe
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Abstract
A toner according to the present invention contains at least a polyester resin as a binder resin, a colorant, a releasing agent, a fixing-assisting component, and a fatty acid, wherein the fixing-assisting component has a melting point of 60° C. to 120° C. and contains at least one of an esterified compound obtained by esterification of the fatty acid and an amide compound obtained by amidation of the fatty acid.
Claims10
A toner comprising:
- a polyester resin as a binder resin,
- a colorant in an amount of 1% to 15% by mass based on total amount of toner,
- a fixing-assisting component in an amount of 2% to 25% by mass based on total amount of toner,
- a fatty acid in an amount of 0.5% to 5% by mass based on total amount of toner, and
- a releasing agent in addition to the fixing-assisting component and the fatty acid, wherein the releasing agent is present in an amount of 1% to 30% by mass based on total amount of toner, wherein the releasing agent is any one of carnauba wax, cotton wax, Japan wax, rice wax, bees wax, lanolin, ozokerite, cerecine, paraffin wax, microcrystalline wax, petrolatum, Fisher-Tropsh wax, polyethylene wax, polypropylene wax, ketone wax, ether wax, poly-n-stearyl methacrylate, poly-n-lauryl methacrylate, a copolymer of n-stearyl acrylate-ethyl methacrylate, and a crystalline polymer having a long-chain alkyl group at its side chain;
- wherein the fixing-assisting component has a melting point of 60° C. to 120° C. and comprises at least is any one of an esterified compound obtained by esterification of the fatty acid and an amide compound obtained by amidation of the fatty acid.
3 more elements
A developer comprising:
- a toner,
- wherein the toner comprises at least a polyester resin as a binder resin, a colorant in an amount of 1% to 15% by mass based on total amount of toner, a fixing-assisting component in an amount of 2% to 25% by mass based on total amount of toner, a fatty acid in an amount of 0.5% to 5% by mass based on total amount of toner, and a releasing agent in addition to the fixing-assisting compound and the fatty acid, wherein the releasing agent is present in an amount of 1% to 30% by mass based on total amount of toner, wherein the releasing agent is any one of carnauba wax, cotton wax, Japan wax, rice wax, bees wax, lanolin, ozokerite, cerecine, paraffin wax, microcrystalline wax, petrolatum, Fisher-Tropsh wax, polyethylene wax, polypropylene wax, ketone wax, ether wax, poly-n-stearyl methacrylate, poly-n-lauryl methacrylate, a copolymer of n-stearyl acrylate-ethyl methacrylate, and a crystalline polymer having a long-chain alkyl group at its side chain, and
- wherein the fixing-assisting component has a melting point of 60° C. to 120° C. and is any one of an esterified compound obtained by esterification of the fatty acid and an amide compound obtained by amidation of the fatty acid.
Dependencies are inferred from the claim text.