US 12,461,461 B2
Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method
Masaki Iwase, Kanagawa (JP); Shinya Sakamoto, Kanagawa (JP); and Yumi Tanaka, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Apr. 27, 2022, as Appl. No. 17/731,231.
Claims priority of application No. 2021-157170 (JP), filed on Sep. 27, 2021.
Prior Publication US 2023/0095449 A1, Mar. 30, 2023
Int. Cl. G03G 9/087 (2006.01); G03G 9/08 (2006.01); G03G 15/08 (2006.01)
CPC G03G 9/08711 (2013.01) [G03G 9/0819 (2013.01); G03G 9/0821 (2013.01); G03G 15/08 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electrostatic charge image developing toner comprising:
toner particles that contain a binder resin and resin particles,
wherein the binder resin contains a crystalline resin and an amorphous resin,
wherein the resin particles are styrene-(meth)acrylic resin particles of crosslinked resin particles,
wherein the electrostatic charge image developing toner satisfies the following Formulas (1) to (4),
G′1(90)<1×105 Pa  Formula (1)
1×103 Pa<G′50(180)  Formula (2)
1<G′50(90)/G′50(180)<30  Formula (3)
1<G′1(90)/G′50(90)<10,  Formula (4)
where G′1 (90) represents a storage modulus G′ of the electrostatic charge image developing toner determined by measuring a dynamic viscoelasticity of the electrostatic charge image developing toner at a frequency of 1 Hz, a temperature of 90° C. and a strain of 1%,
G′50 (90) represents a storage modulus G′ of the electrostatic charge image developing toner determined by measuring the dynamic viscoelasticity of the electrostatic charge image developing toner at the frequency of 1 Hz, the temperature of 90° C. and a strain of 50%, and
G′50 (180) represents a storage modulus G′ of the electrostatic charge image developing toner determined by measuring the dynamic viscoelasticity of the electrostatic charge image developing toner at the frequency of 1 Hz, a temperature of 180° C. and the strain of 50%,
wherein the storage modulus G′ of the electrostatic charge image developing toner in a range of 30° C. or higher and 50° C. or lower is 1×108 Pa or more, and a temperature at which the storage modulus G′ of the electrostatic charge image developing toner reaches a value less than 1×105 Pa is 65° C. or higher and 90° C. or lower where the viscoelasticity of the electrostatic charge image developing toner is measured at a heating rate of 2° C./min.