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US 11,687,013 B2Granted
Toner for electrostatic charge image development, toner stored unit, image forming apparatus, and image forming method
AssigneeRicoh Company, Ltd.
InventorsToshihiko Sugiyama, Minoru Masuda, Yuka Mizoguchi, Hideki Sugiura
Life of this patent
Estimating the term…
Abstract
A toner for electrostatic charge image development, wherein a spin-spin relaxation time of the toner at 90° C. is 0.30 msec or more but 1.50 msec or less, and a spin-spin relaxation time of the toner at 50° C. is 0.0185 msec or more but 0.0300 msec or less, the spin-spin relaxation time of the toner at 90° C. and the spin-spin relaxation time of the toner at 50° C. being obtained by Hahn echo method of pulse NMR analysis.
Claims15
A toner for electrostatic charge image development,
- wherein a spin-spin relaxation time of the toner at 90° C. is 0.30 msec or more but 1.50 msec or less, and a spin-spin relaxation time of the toner at 50° C. is 0.0185 msec or more but 0.0300 msec or less, the spin-spin relaxation time of the toner at 90° C. and the spin-spin relaxation time of the toner at 50° C. being obtained by Hahn echo method of pulse NMR analysis,
- wherein the toner comprises a non-crystalline polyester resin and a crystalline polyester resin,
- wherein the toner has a domain-matrix structure in which the non-crystalline polyester resin is a matrix, and the crystalline polyester resin is a domain, and
- wherein an amount of the crystalline polyester resin is 10% by mass or more but 20% by mass or less relative to an amount of the toner.
1 more element
An image forming apparatus, comprising:
- an electrostatic latent image bearer;
- an electrostatic latent image forming unit configured to form an electrostatic latent image on the electrostatic latent image bearer;
- and
- a developing unit including a toner and configured to develop, using the toner, the electrostatic latent image formed on the electrostatic latent image bearer, to form a toner image,
- wherein the toner is a toner for electrostatic charge image development,
- wherein a spin-spin relaxation time of the toner at 90° C. is 0.30 msec or more but 1.50 msec or less, and a spin-spin relaxation time of the toner at 50° C. is 0.0185 msec or more but 0.0300 msec or less, the spin-spin relaxation time of the toner at 90° C. and the spin-spin relaxation time of the toner at 50° C. being obtained by Hahn echo method of pulse NMR analysis,
- wherein the toner comprises a non-crystalline polyester resin and a crystalline polyester resin, and wherein the toner has a domain-matrix structure in which the non-crystalline polyester resin is a matrix, and the crystalline polyester resin is a domain, and
- wherein an amount of the crystalline polyester resin is 10% by mass or more but 20% by mass or less relative to an amount of the toner.
5 more elements
An image forming method, comprising:
- forming an electrostatic latent image on an electrostatic latent image bearer;
- and
- developing, using a toner, the electrostatic latent image formed on the electrostatic latent image bearer, to form a toner image,
- wherein the toner is a toner for electrostatic charge image development,
- wherein a spin-spin relaxation time of the toner at 90° C. is 0.30 msec or more but 1.50 msec or less, and a spin-spin relaxation time of the toner at 50° C. is 0.0185 msec or more but 0.0300 msec or less, the spin-spin relaxation time of the toner at 90° C. and the spin-spin relaxation time of the toner at 50° C. being obtained by Hahn echo method of pulse NMR analysis,
- wherein the toner comprises a non-crystalline polyester resin and a crystalline polyester resin, and wherein the toner has a domain-matrix structure in which the non-crystalline polyester resin is a matrix, and the crystalline polyester resin is a domain, and
- wherein an amount of the crystalline polyester resin is 10% by mass or more but 20% by mass or less relative to an amount of the toner.
4 more elements
Dependencies are inferred from the claim text.