Toner, toner cartridge, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-2022404728-A1
Application number	US-202217575007-A
Country	US
Kind code	A1
Filing date	Jan 13, 2022
Priority date	Jun 11, 2021
Publication date	Dec 22, 2022
Grant date	—

Abstract

A toner contains a crystalline polyester resin, a non-crystalline polyester resin A having a melting temperature ranging between 99° C. to 108° C., a non-crystalline polyester resin B having a melting temperature ranging between 140° C. to 150° C., an ester wax, and a colorant. A ratio of the crystalline polyester resin is 5% mass to 15% mass to a total T of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant. A ratio of the non-crystalline polyester resin A to the total T is between 50% mass to 60% mass. A ratio of the non-crystalline polyester resin B to the total T is between 20% mass to 30% mass.

First claim

What is claimed is:

1 . A toner comprising:
a crystalline polyester resin; a non-crystalline polyester resin A having a melting temperature ranging between 99° C. to 108° C.; a non-crystalline polyester resin B having a melting temperature ranging between 140° C. to 150° C.; an ester wax; and a colorant, wherein a ratio of the crystalline polyester resin is 5 mass % to 15 mass % with respect to 100 mass % of a total of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant, a ratio of the non-crystalline polyester resin A is between 50 mass % to 60 mass % with respect to 100 mass % of the total of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant, and a ratio of the non-crystalline polyester resin B is between 20 mass % to 30 mass % with respect to 100 mass % of the total of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant.

2 . The toner of claim 1 , wherein
an ester wax residual ratio calculated by the following equation is 75% to 95%,
Ester wax residual ratio being (%)=(W 1 /W 0 )×100,
where W 0 is an endothermic amount (J/g) measured using a differential scanning calorimeter for the toner; and W 1 is an endothermic amount (J/g) measured using the differential scanning calorimeter for particles obtained by heating a dispersion liquid containing the toner, water, and a surfactant at 50° C. for 1 hour, then leaving the dispersion liquid at rest until a temperature thereof decreases to a room temperature, and then removing a supernatant liquid of the dispersion liquid to obtain a solid content, and drying the solid content.

3 . The toner of claim 2 , wherein the ester wax residual ratio is 78% to 92%.

4 . The toner of claim 1 , wherein
the toner has a ratio of the ester wax of between 3% mass to 10% mass with respect to 100% mass of the total of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant.

5 . The toner of claim 4 , wherein
the toner has a ratio of the ester wax of between 4% mass to 9% mass with respect to 100% mass of the total of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant.

6 . The toner of claim 1 , wherein the non-crystalline polyester resin A has a melting temperature of ranging between 102° C. to 105° C.

7 . The toner of claim 1 , wherein a non-crystalline polyester resin B has a melting temperature of ranging between 142° C. to 148° C.

8 . The toner of claim 1 , wherein the ratio of the crystalline polyester resin is 7 mass % to 13 mass % with respect to 100 mass % of the total of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant.

9 . The toner of claim 1 , wherein the ratio of the non-crystalline polyester resin A is between 52 mass % to 58 mass % with respect to 100 mass % of the total of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant.

10 . The toner of claim 1 , wherein the ratio of the non-crystalline polyester resin B is between 22 mass % to 28 mass % with respect to 100 mass % of the total of the crystalline polyester resin, the non-crystalline polyester resin A, the non-crystalline polyester resin B, the ester wax, and the colorant.

11 . The toner of claim 1 , wherein the toner further comprises an external additive comprising an inorganic oxide.

12 . The toner of claim 11 , wherein the inorganic oxide is surface-treated with a hydrophobizing agent.

13 . The toner of claim 1 , wherein the non-crystalline polyester resin A has a mass average molecular weight of 9.0×10 3 to 1.5×10 4 .

14 . The toner of claim 1 , wherein the non-crystalline polyester resin B has a mass average molecular weight of 2.5×10 4 to 3.4×10 4 .

15 . A toner cartridge comprising a container comprising a toner according to claim 1 .

16 . An image forming apparatus comprising a toner cartridge according to claim 15 .

Assignees

• Toshiba Tec Kk

Inventors

• Hatano Takumi

Classifications

• G03G9/08795

  characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants · CPC title

• G03G9/08782 Primary

  Waxes · CPC title

• C08G2250/00

  Compositions for preparing crystalline polymers · CPC title

• G03G9/08797

  characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature · CPC title

• G03G9/0904

  Carbon black · CPC title