US 12,276,937 B2
Magenta toner and method for producing the magenta toner
Masashi Watanabe, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 17/276,580
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed Sep. 13, 2019, PCT No. PCT/JP2019/036136
§ 371(c)(1), (2) Date Mar. 16, 2021,
PCT Pub. No. WO2020/066700, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-185241 (JP), filed on Sep. 28, 2018.
Prior Publication US 2022/0050396 A1, Feb. 17, 2022
Int. Cl. G03G 9/09 (2006.01); G03G 9/08 (2006.01)
CPC G03G 9/091 (2013.01) [G03G 9/0806 (2013.01)] 7 Claims
 
1. A magenta toner comprising a binder resin and a colorant,
wherein the colorant included in the magenta toner consists of:
a magenta pigment A, which is obtained by surface-treating a pigment represented by the following formula (1) with a metal rosinate, and
another magenta pigment different from the magenta pigment A;
wherein said another magenta pigment is at least one selected from C.I. Pigment Violet 19 and C.I. Pigment Red 122;
wherein a content of the magenta pigment A is from 1 part by mass to 5 parts by mass with respect to 100 parts by mass of the binder resin;
wherein the metal rosinate is contained at from 1 part by mass to 7 parts by mass with respect to 100 parts by mass of the magenta pigment A:

OG Complex Work Unit Chemistry
where Me represents a bivalent metal,
wherein a mass ratio of the magenta pigment A and said another magenta pigment is from 60:40 to 40:60; and
wherein the magenta toner further comprises a positively-chargeable charge control resin and is a positively-chargeable toner.