Toner for electrostatic charge image development, electrostatic charge image developer, toner cartridge, process cartridge and image forming device
View Patent ↗A toner for electrostatic charge image development has toner mother particles including a release agent, a colorant, and a binder resin including a crystalline resin, and an external additive to the toner mother particles including at least metatitanic acid and at least one selected from the group consisting of silicon oxide and fluoropolymer particles, and the addition weight ratio of the metatitanic acid to the at least one selected from the group consisting of silicon oxide and fluoropolymer particles is from 1:0.08 to 1:8.30 is provided.
1. A toner for electrostatic charge image development, comprising:
toner mother particles including a release agent, a colorant, and a binder resin containing a crystalline resin; and
an external additive to the toner mother particles, the external additive comprising at least metatitanic acid and fluoropolymer particles,
wherein
the amount of the fluoropolymer particles included in the toner is from approximately 0.1 parts by weight to approximately 0.8 parts by weight relative to 100 parts by weight of the toner mother particles,
the weight ratio of the metatitanic acid to the fluoropolymer particles is from approximately 1:0.08 to approximately 1:8.30, and
the number average particle diameter of the metatitanic acid particles is from 20 nm to 40 nm.
2. The toner for electrostatic charge image development of claim 1 , wherein the weight-average molecular weight of the fluoropolymer particles is from approximately 200,000 to approximately 800,000.
3. The toner for electrostatic charge image development of claim 1 , wherein the colorant is a monoazo pigment or a naphthol pigment.
4. The toner for electrostatic charge image development of claim 1 , wherein the crystalline resin is a crystalline polyester resin containing a diol-derived component derived from a straight-chain aliphatic diol, the main chain portion of which has from 7 to 20 carbon atoms.
5. The toner for electrostatic charge image development of claim 1 , wherein the melting temperature of the crystalline resin is approximately from 50° C. to approximately 100° C.
6. The toner for electrostatic charge image development of claim 1 , wherein the crystalline resin has a weight-average molecular weight (Mw) of from 5000 to 60,000.
7. The toner for electrostatic charge image development of claim 1 , wherein the binder resin further includes a non-crystalline resin, and the content ratio of the crystalline resin to the non-crystalline resin by weight is from approximately 4:96 to approximately 20:80.
8. The toner for electrostatic charge image development of claim 7 , wherein the non-crystalline resin has a weight-average molecular weight (Mw) of from approximately 5000 to approximately 1,000,000.
9. The toner for electrostatic charge image development of claim 7 , wherein the non-crystalline resin has a molecular weight distribution (Mw/Mn) of from approximately 1.5 to approximately 100, Mw representing the weight-average molecular weight and Mn representing number-average molecular weight.
10. The toner for electrostatic charge image development of claim 7 , wherein the non-crystalline resin has a softening temperature of from approximately 80° C. to approximately 130° C.
11. The toner for electrostatic charge image development of claim 1 , wherein the release agent is a substance having a main endothermic peak as measured in compliance with ASTMD 3418-8 in the range of from approximately 50° C. to approximately 140° C.
12. The toner for electrostatic charge image development of claim 1 , wherein the viscosity η 1 of the release agent at 160° C. is in the range of from approximately 20 mPa·s to approximately 200 mPa·s.
13. An electrostatic charge image developer comprising the toner for electrostatic charge image development of claim 1 and a carrier.
14. The electrostatic charge image developer of claim 13 , wherein the carrier includes a core having an electrical resistance of from approximately 1×10 7.5 Ω·cm to approximately 1×10 9.5 Ω·cm.
15. A toner cartridge that is attachable to and detachable from an image forming device and that holds toner that is to be supplied to a development unit provided within the image forming device, wherein the toner is the toner for electrostatic charge image development of claim 1 .
16. The toner for electrostatic charge image development of claim 1 , wherein the weight ratio of the metatitanic acid to the fluoropolymer particles is from 1:0.20 to 1:6.00.
17. The toner for electrostatic charge image development of claim 1 , wherein the weight ratio of the metatitanic acid to the fluoropolymer particles is from 1:0.20 to 1:4.50.
18. The toner for electrostatic charge image development of claim 1 , wherein the fluoropolymer particles are selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylne/hexafluoropropylene copolymer, and tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer.
19. A toner for electrostatic charge image development, comprising:
toner mother particles including a release agent, a colorant, and a binder resin containing a crystalline resin; and
an external additive to the toner mother particles, the external additive comprising at least metatitanic acid and at least one selected from the group consisting of silicon oxide and fluoropolymer particles,
wherein
the weight ratio of the metatitanic acid to the at least one selected from the group consisting of silicon oxide and fluoropolymer particles is approximately 1:0.08 to approximately 1:8.30,
when the external additive includes fluoropolymer particles, the amount of the fluoropolymer particles included in the toner is from approximately 0.1 parts by weight to approximately 0.8 parts by weight relative to 100 parts by weight of the toner mother particles,
when the external additive includes silicon oxide, the amount of silicon oxide included in the toner is from 0.5 parts by weight to 2.5 parts by weight relative to 100 parts by weight of the toner mother particles,
the number average particle diameter of the metatitanic acid particles is from 20 nm to 40 nm, and
the toner mother particles are configured such that the toner has a core portion and a shell portion, and the toner mother particles comprise the crystalline resin at the core portion.
20. The toner for electrostatic charge image development of claim 19 , wherein the external additive comprises at least metatitanic acid and fluoropolymer particles, the fluoropolymer particles being selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylne/hexafluoropropylene copolymer, and tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer.