Toner, image forming apparatus, image forming method, and toner stored unit

Patent metadata

Field	Value
Publication number	US-10310399-B2
Application number	US-201515536531-A
Country	US
Kind code	B2
Filing date	Nov 26, 2015
Priority date	Dec 19, 2014
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

Provided is a toner including at least a binder resin, and having peak ratio W/R of from 0.20 to 0.70 when measured with FT-IR according to ATR method, W/R being a ratio of height W of maximum spectral peak attributed to bisphenol A skeleton of the toner and observed at from 1,480 cm−1 to 1,520 cm−1 to height R of maximum spectral peak attributed to carbonyl group of the toner and observed at from 1,700 cm−1 to 1,750 cm−1, wherein molecular weight distribution of the toner obtained by GPC of THF-soluble component of the toner has main peak in a range of from 1,000 to 10,000, half value width of the molecular weight distribution is a molecular weight of 20,000 or less, and content of a THF-insoluble component in the toner is from 5% by mass to 40% by mass.

First claim

The invention claimed is:

1. A toner, comprising
a binder resin comprising a polyester resin,
wherein an alcohol component constituting the polyester resin comprises a bisphenol A component,
wherein the toner has a peak ratio W/R of from 0.20 to 0.70 when measured according to a Fourier Transform InfraRed spectroscopic analysis (FT-IR) method according to an Attenuated Total Reflection (ATR) method, where the peak ratio W/R is a ratio of a height W of a maximum spectral peak attributed to a bisphenol A skeleton of the toner and observed at from 1,480 cm −1 to 1,520 cm −1 to a height R of a maximum spectral peak attributed to a carbonyl group of the toner and observed at from 1,700 cm −1 to 1,750 cm −1 ,
wherein a molecular weight distribution of the toner obtained by Gel Permeation Chromatography (GPC) of a tetrahydrofuran (THF)-soluble component of the toner has a main peak in a range of from 1,000 to 10,000, and a half value width of the molecular weight distribution is a molecular weight of 20,000 or less, and
wherein a content of a THF-insoluble component in the toner is from 5% by mass to 40% by mass.

2. The toner according to claim 1 ,
wherein the toner has a peak ratio W′/R′ of from 0.06 to 0.70 when measured according to a Fourier Transform InfraRed spectroscopic analysis (FT-IR) method according to infrared spectroscopy (KBr tablet method), where the peak ratio W′/R′ is a ratio of a height W′ of a spectral peak of the toner observed at from 1,480 cm −1 to 1,520 cm −1 to a height R′ of a spectral peak of the toner observed at from 1,700 cm −1 to 1,750 cm −1 .

3. The toner according to claim 2 ,
wherein the peak ratio W/R and the peak ratio W′/R′ satisfies a relationship below,
W′/R′≤W/R.

4. The toner according to claim 2 ,
wherein a ratio (W/R)/(W′/R′) of the peak ratio W/R to the peak ratio W′/R′ is from 1.0 to 2.0.

5. The toner according to claim 1 ,
wherein a content of the bisphenol A component in a THF-soluble alcohol component of the toner is from 20 mol % to 100 mol %,
wherein a content of the bisphenol A component in a THF-insoluble alcohol component of the toner is from 0 mol % to 80 mol %, and
wherein the content of the bisphenol A in the THF-soluble alcohol component is greater than the content of the bisphenol A in the THF-insoluble alcohol component.

6. The toner according to claim 1 ,
wherein the content of the THF-insoluble component in the toner is from 10% by mass to 35% by mass.

7. An image forming method, comprising:
forming an electrostatic latent image over an electrostatic latent image bearer;
developing the electrostatic latent image formed over the electrostatic latent image bearer with a toner according to claim 1 to form a toner image,
transferring the toner image formed over the electrostatic latent image bearer onto a recording medium; and
fixing the toner image transferred onto the recording medium.

8. A toner stored unit, comprising
a toner,
wherein the toner stored unit stores the toner,
wherein the toner comprises a binder resin comprising a polyester resin,
wherein an alcohol component constituting the polyester resin comprises a bisphenol A component,
wherein the toner has a peak ratio W/R of from 0.20 to 0.70 when measured according to a Fourier Transform InfraRed spectroscopic analysis (FT-IR) method according to an Attenuated Total Reflection (ATR) method, where the peak ratio W/R is a ratio of a height W of a maximum spectral peak attributed to a bisphenol A skeleton of the toner and observed at from 1,480 cm −1 to 1,520 cm −1 to a height R of a maximum spectral peak attributed to a carbonyl group of the toner and observed at from 1,700 cm −1 to 1,750 cm −1 ,
wherein a molecular weight distribution of the toner obtained by Gel Permeation Chromatography (GPC) of a tetrahydrofuran (THF)-soluble component of the toner has a main peak in a range of from 1,000 to 10,000, and a half value width of the molecular weight distribution is a molecular weight of 20,000 or less, and
wherein a content of a THF-insoluble component in the toner is from 5% by mass to 40% by mass.

9. An image forming apparatus, comprising:
an electrostatic latent image bearer;
a charging unit configured to electrically charge the electrostatic latent image bearer;
an electrostatic latent image forming unit configured to form an electrostatic latent image over the electrically charged electrostatic latent image bearer;
a developing unit configured to develop the electrostatic latent image formed over the electrostatic latent image bearer with a toner to form a toner image;
a transfer unit configured to transfer the toner image formed over the electrostatic latent image bearer onto a recording medium; and
a fixing unit configured to fix the toner image transferred onto the recording medium,
wherein the toner comprises a binder resin comprising a polyester resin,
wherein an alcohol component constituting the polyester resin comprises a bisphenol A component,
wherein the toner has a peak ratio W/R of from 0.20 to 0.70 when measured according to a Fourier Transform InfraRed spectroscopic analysis (FT-IR) method according to an Attenuated Total Reflection (ATR) method, where the peak ratio W/R is a ratio of a height W of a maximum spectral peak attributed to a bisphenol A skeleton of the toner and observed at from 1,480 cm −1 to 1,520 cm −1 to a height R of a maximum spectral peak attributed to a carbonyl group of the toner and observed at from 1,700 cm −1 to 1,750 cm −1 ,
wherein a molecular weight distribution of the toner obtained by Gel Permeation Chromatography (GPC) of a tetrahydrofuran (THF)-soluble component of the toner has a main peak in a range of from 1,000 to 10,000, and a half value width of the molecular weight distribution is a molecular weight of 20,000 or less, and
wherein a content of a THF-insoluble component in the toner is from 5% by mass to 40% by mass.

Assignees

• Matsushita Natsuko
• Suzuki Tomomi
• Ogino Kohtaroh
• Moriya Tohru
• Ricoh Co Ltd

Inventors

• Matsushita Natsuko
• Suzuki Tomomi
• Ogino Kohtaroh
• Moriya Tohru

Classifications

• G03G9/0821 Primary

  characterised by physical parameters (magnetic parameters G03G9/083) · CPC title

• G03G9/081

  by mixing the toner components in a liquefied state; melt kneading; reactive mixing · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/08795

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

• G03G15/08

  using a solid developer, e.g. powder developer · CPC title