Electrostatic latent image developing toner

Patent metadata

Field	Value
Publication number	US-9304421-B2
Application number	US-201414476035-A
Country	US
Kind code	B2
Filing date	Sep 3, 2014
Priority date	Sep 5, 2013
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

An electrostatic latent image developing toner includes a toner base particle which contains at least a binder resin, and has a domain-matrix structure, in which a matrix contains a styrene-acrylic resin, a domain contains an amorphous resin which is formed by combining a vinyl-based polymerized segment and a polyester-based polymerized segment, and the domain containing the amorphous resin and having a diameter of 100 nm or larger has a number-average domain diameter which falls in the range from 150 to 1000 nm.

First claim

What is claimed is:

1. An electrostatic latent image developing toner comprising a toner base particle which contains at least a binder resin, and has a domain-matrix structure, wherein
a matrix contains a styrene-acrylic resin,
a domain contains an amorphous resin which is formed by combining a vinyl-based polymerized segment and a polyester-based polymerized segment, and
the domain containing the amorphous resin and having a diameter of 100 nm or larger has a number-average domain diameter which falls in the range from 150 to 1000 nm.

2. The electrostatic latent image developing toner of claim 1 , wherein the number-average domain diameter of the toner base particle falls in the range from 300 to 800 nm.

3. The electrostatic latent image developing toner of claim 1 , wherein when a cross section of the toner base particle is dyed with ruthenium tetroxide and observed under an electron microscope, a total cross-sectional area of the domain accounts for 2 to 50% of a cross-sectional area of each the toner base particle.

4. The electrostatic latent image developing toner of claim 1 , wherein when a cross section of the toner base particle is dyed with ruthenium tetroxide and observed under an electron microscope, a total cross-sectional area of the domain accounts for 5 to 15% of a cross-sectional area of each the toner base particle.

5. The electrostatic latent image developing toner of claim 1 , wherein the binder resin contained in the toner base particle contains 5 to 70% by mass of the amorphous resin.

6. The electrostatic latent image developing toner of claim 1 , wherein the binder resin contained in the toner base particle contains 10 to 20% by mass of the amorphous resin.

7. The electrostatic latent image developing toner of claim 1 , wherein a proportion of a content of the vinyl-based polymerized segment in the amorphous resin is 5 to 30% by mass.

8. The electrostatic latent image developing toner of claim 1 , wherein assuming a radius of the toner base particle as r, and a distance from a surface of the toner base particle to an r/2 point as a near-the-surface range, 80% by volume or more of the amorphous resin resides in the near-the-surface range of the toner base particle.

9. The electrostatic latent image developing toner of claim 1 , wherein in the matrix comprising at least the styrene-acrylic resin, the domain of the amorphous resin and a domain of a mold releasing agent are scattered, and the amorphous resin and the mold releasing agent independently form the respective domains.

Assignees

• Konica Minolta Inc

Inventors

• Sekiguchi Kouji
• Nagase Tatsuya
• Hirano Shiro
• Onishi Junya
• Miyajima Kenshi
• Fujisaki Tatsuya

Classifications

• G03G9/08704

  Polyalkenes · CPC title

• G03G9/08797

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

• G03G9/08

  with toner particles · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title