Magenta toner, developer, toner cartridge, process cartridge, image forming apparatus, and image forming method
View Patent ↗A magenta toner including toner particles containing a colorant and a binder resin is provided. The colorant contains C.I. Pigment Red 122 and C.I. Pigment Yellow 180 and a mass ratio of the C.I. Pigment Red 122 and the C.I. Pigment Yellow 180 is in the range of 99:1 to 10000:1. The binder resin contains a polyester resin and a polyester resin having a repeating unit obtained from a Bisphenol A alkylene oxide adduct expressed by the following chemical formula is used as the polyester resin: wherein m and n independently represent an integer of 2 to 4, and x and y independently represent a positive number.
1. A magenta toner comprising toner particles having a colorant and a binder resin, wherein
the colorant contains C.I. Pigment Red 122 and C.I. Pigment Yellow 180, and a mass ratio of the C.I. Pigment Red 122 and the C.I. Pigment Yellow 180 is in the range of 99:1 to 10000:1,
the binder resin contains a polyester resin, and
a polyester resin containing a repeating unit obtained from a Bisphenol A alkylene oxide adduct expressed by the following chemical formula 1 is used as the polyester resin:
wherein m and n independently represent an integer of from 2 to 4, and x and y independently represent a positive number.
2. The magenta toner according to claim 1 , wherein a volume-average particle diameter of the toner particles is in the range of from about 8 μm to about 15 μm.
3. The magenta toner according to claim 1 , wherein a shape factor SF1 of the toner particles is in the range of from about 140 to about 160.
4. The magenta toner according to claim 1 , wherein the toner particles contain a hydrocarbon wax as a release agent.
5. The magenta toner according to claim 4 , wherein the hydrocarbon wax is selected from paraffin waxes, microcrystalline waxes, Fischer-Tropsch waxes, petroleum waxes, and modified products thereof.
6. The magenta toner according to claim 1 , wherein a glass transition temperature of the magenta toner is in the range of from about 35° C. to about 50° C.
7. The magenta toner according to claim 1 , wherein the mass ratio of the C.I. Pigment Red 122 and the C.I. Pigment Yellow 180 is in the range of 500:1 to 5000:1.
8. The magenta toner according to claim 1 , wherein the polyester resin has a ratio of the repeating unit obtained from the Bisphenol A alkylene oxide adduct to a repeating unit obtained from overall diol components, which is equal to or more than 80 mol %.
9. The magenta toner according to claim 1 , wherein the toner particles are formed by kneading a toner-forming material including the colorant and the binder resin to form a kneaded material and pulverizing the kneaded material.
10. An electrostatic latent image developer comprising the magenta toner according to claim 1 .
11. The electrostatic latent image developer according to claim 10 , wherein a glass transition temperature of the magenta toner is in the range of from about 35° C. to about 50° C.
12. The electrostatic latent image developer according to claim 10 , wherein the colorant of the magenta toner contains the C.I. Pigment Red 122 and the C.I. Pigment Yellow 180 in the range of mass ratio of 500:1 to 5000:1.
13. A process cartridge for an image forming apparatus, comprising:
an image holding member; and
a developing unit that develops an electrostatic latent image formed on the surface of the image holding member with a developer to form a toner image,
wherein the developer is the electrostatic latent image developer according to claim 10 .
14. The process cartridge for an image forming apparatus according to claim 13 , wherein the colorant of the magenta toner contains the C.I. Pigment Red 122 and the C.I. Pigment Yellow 180 in the range of mass ratio of 500:1 to 5000:1.
15. An image forming apparatus comprising:
an image holding member;
a charging unit that charges the surface of the image holding member;
a latent image forming unit that forms an electrostatic latent image on the surface of the image holding member;
a developing unit that develops the electrostatic latent image formed on the surface of the image holding member with a developer to form a toner image; and
a transfer unit that transfers the developed toner image to a transfer medium,
wherein the developer is the electrostatic latent image developer according to claim 10 .
16. The image forming apparatus according to claim 15 , wherein the colorant of the magenta toner contains the C.I. Pigment Red 122 and the C.I. Pigment Yellow 180 in the range of mass ratio of 500:1 to 5000:1.
17. An image forming method comprising:
charging the surface of an image holding member;
forming an electrostatic latent image on the surface of the image holding member;
developing the electrostatic latent image formed on the surface of the image holding member with a developer to form a toner image; and
transferring the developed toner image to a transfer medium,
wherein the developer is the electrostatic latent image developer according to claim 10 .
18. The image forming method according to claim 17 , wherein the colorant of the magenta toner contains the C.I. Pigment Red 122 and the C.I. Pigment Yellow 180 in the range of mass ratio of 500:1 to 5000:1.
19. A toner cartridge comprising a toner containing chamber,
wherein the toner containing chamber contains the magenta toner according to claim 1 .