Resin particles, method of producing resin particles, toner, toner storage unit, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-2023279222-A1
Application number	US-202318177412-A
Country	US
Kind code	A1
Filing date	Mar 2, 2023
Priority date	Mar 7, 2022
Publication date	Sep 7, 2023
Grant date	—

Abstract

Resin particles include a binder resin in each of the resin particles. The binder resin includes a biomass-derived resin, and polyethylene terephthalate or polybutylene terephthalate. An amount A of a biomass-derived component of the biomass-derived resin and an amount B of the polyethylene terephthalate or the polybutylene terephthalate satisfy A>B. Each of the resin particles has a core-shell structure including a shell layer and a core layer. An average thickness of the shell layer is from 100 nm to 500 nm.

First claim

What is claimed is:

1 . Resin particles, each comprising:
a binder resin, wherein the binder resin includes a biomass-derived resin, and polyethylene terephthalate or polybutylene terephthalate, an amount A of a biomass-derived component of the biomass-derived resin and an amount B of the polyethylene terephthalate or the polybutylene terephthalate satisfy A>B, each of the resin particles has a core-shell structure including a shell layer and a core layer, and an average thickness of the shell layer is from 100 nm to 500 nm.

2 . The resin particles according to claim 1 ,
wherein the shell layer includes a binder resin free from the biomass-derived resin.

3 . The resin particles according to claim 1 ,
wherein the average thickness of the shell layer is from 200 nm to 300 nm.

4 . The resin particles according to claim 1 ,
wherein a sum [A+B] of the amount A of the biomass-derived component of the biomass-derived resin and the amount B of the polyethylene terephthalate or the polybutylene terephthalate relative to a total mass of the resin particles is 35% by mass or greater.

5 . The resin particles according to claim 4 ,
wherein the amount A of the biomass-derived component of the biomass-derived resin relative to the total mass of the resin particles is from 25% by mass to 35% by mass.

6 . The resin particles according to claim 1 ,
wherein the resin particles have a radiocarbon 14 C content of 10.8 pMC or greater.

7 . A method of producing resin particles, comprising:
dissolving or dispersing a binder resin including a biomass-derived resin and polyethylene terephthalate or polybutylene terephthalate in an organic solvent to prepare an oil phase, where an amount A of a biomass-derived component of the biomass-derived resin and an amount B of the polyethylene terephthalate or the polybutylene terephthalate satisfy A>B; adding an aqueous phase to the oil phase to cause phase inversion emulsification from a water-in-oil dispersion liquid to an oil-in-water dispersion liquid in which particles of the oil phase are dispersed in the aqueous phase; coagulating the particles in the oil-in-water dispersion liquid to prepare cohesive particles; and forming a shell layer on each of the cohesive particles to form resin particles according to claim 1 each having a core-shell structure, where the core-shell structure includes the shell layer and a core layer, and an average thickness of the shell layer is from 100 nm to 500 nm.

8 . A toner comprising:
the resin particles according to claim 1 ; and one or more external additives.

9 . A toner storage unit comprising:
the toner according to claim 8 ; and a unit in which the toner is stored.

10 . 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 that stores the toner according to claim 8 and is configured to develop the electrostatic latent image formed on the electrostatic latent image bearer with the toner to form a visible image.

Assignees

• Nagatomo Tsuneyasu
• Watanabe Junichi
• Mizoguchi Yuka
• Satoh Kohsuke
• Ricoh Co Ltd

Inventors

• Nagatomo Tsuneyasu
• Watanabe Junichi
• Mizoguchi Yuka
• Satoh Kohsuke

Classifications

• C08J3/126 Primary

  Polymer particles coated by polymer, e.g. core shell structures · CPC title

• C08J2467/03

  the dicarboxylic acids and dihydroxy compounds having the hydroxy and the carboxyl groups directly linked to aromatic rings · CPC title

• C08J2391/06

  Waxes · CPC title

• C08L67/00

  Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers · CPC title

• C08G63/127

  Acids containing aromatic rings · CPC title