Electrostatic latent image developing toner

Patent metadata

Field	Value
Publication number	US-10120296-B2
Application number	US-201715710259-A
Country	US
Kind code	B2
Filing date	Sep 20, 2017
Priority date	Sep 29, 2016
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

An electrostatic latent image developing toner includes toner particles which comprises a binder resin and a releasing agent. A main component of the binder resin is a polyester resin. The binder resin comprises a crystalline polyester resin, an amorphous polyester resin and a hybrid vinyl resin. The hybrid vinyl resin is composed of a vinyl polymer segment and at least one segment selected from a polyester polymer segment, an urethane polymer segment and an urea polymer segment which is chemically bound to the vinyl polymer segment. A main component of the hybrid vinyl resin is the vinyl polymer segment which comprises a structural unit derived from a monomer having a specific structure. A tetrahydrofuran-soluble fraction of the toner has a main peak of a molecular weight distribution measured by gel permeation chromatography within the range of 11000 to 30000.

First claim

What is claimed is:

1. An electrostatic latent image developing toner, comprising:
toner particles which comprises a binder resin and a releasing agent,
wherein a main component of the binder resin is a polyester resin,
wherein the binder resin comprises a crystalline polyester resin, an amorphous polyester resin and a hybrid vinyl resin,
wherein the hybrid vinyl resin is composed of a vinyl polymer segment and at least one segment selected from the group consisting of a polyester polymer segment, a urethane polymer segment, and a urea polymer segment which is chemically bound to the vinyl polymer segment,
wherein a content of the vinyl polymer segment of the hybrid vinyl resin is within the range of 1 to 20 mass % with respect to the binder resin,
wherein a main component of the hybrid vinyl resin is the vinyl polymer segment which comprises a structural unit derived from a monomer of a following formula (1),
H 2 C═CR 1 —COOR 2   (1)

where R 1 is a hydrogen atom or a methyl group, and R 2 is a long-chain alkyl group of 6 carbon atoms or more, and
wherein a tetrahydrofuran-soluble fraction of the toner has a main peak of a molecular weight distribution measured by gel permeation chromatography within a range of 11000 to 30000.

2. The electrostatic latent image developing toner according to claim 1 ,
wherein an average circularity of the toner particles is within the range of 0.940 to 0.995, and
wherein a coefficient of variation of a number particle size distribution of the toner particles is equal to or less than 20%.

3. The electrostatic latent image developing toner according to claim 1 , wherein the number of carbon atoms of the long-chain alkyl group of R 2 is equal to or less than 20.

4. The electrostatic latent image developing toner according to claim 1 , wherein the number of carbon atoms of the long-chain alkyl group of R 2 is within the range of 8 to 18.

5. The electrostatic latent image developing toner according to claim 1 , wherein the long-chain alkyl group of R 2 comprises a branched structure.

6. The electrostatic latent image developing toner according to claim 1 , wherein the releasing agent comprises a hydrocarbon releasing agent.

7. The electrostatic latent image developing toner according to claim 1 , wherein the releasing agent comprises an ester releasing agent.

8. The electrostatic latent image developing toner according to claim 1 , wherein the content of the vinyl polymer segment of the hybrid vinyl resin is within the range of 5 to 20 mass % with respect to the binder resin.

9. The electrostatic latent image developing toner according to claim 1 , wherein a content of the crystalline polyester resin is within the range of 1 to 30 mass % with respect to the binder resin.

10. The electrostatic latent image developing toner according to claim 1 , wherein a content of the vinyl polymer segment in the hybrid vinyl resin is within the range of 65 to 90 mass %.

11. The electrostatic latent image developing toner according to claim 1 , wherein said at least one segment comprises the polyester polymer segment.

12. The electrostatic latent image developing toner according to claim 1 , wherein the hybrid vinyl resin is a block copolymer of the vinyl polymer segment and said at least one segment.

13. The electrostatic latent image developing toner according to claim 1 , wherein the hybrid vinyl resin comprises a main chain of the vinyl polymer segment and a side chain of said at least one segment.

14. An electrostatic latent image developing toner, comprising:
toner particles which comprises a binder resin and a releasing agent,
wherein a main component of the binder resin is a polyester resin,
wherein the binder resin comprises a crystalline polyester resin, an amorphous polyester resin and a hybrid vinyl resin,
wherein the hybrid vinyl resin is composed of a vinyl polymer segment and at least one segment selected from the group consisting of a polyester polymer segment, a urethane polymer segment, and a urea polymer segment which is chemically bound to the vinyl polymer segment,
wherein a content of the vinyl polymer segment in the hybrid vinyl resin is within the range of 65 to 90 mass %,
wherein a main component of the hybrid vinyl resin is the vinyl polymer segment which comprises a structural unit derived from a monomer of a following formula (1),
H 2 C═CR 1 —COOR 2   (1)

where R 1 is a hydrogen atom or a methyl group, and R 2 is a long-chain alkyl group of 6 carbon atoms or more, and
wherein a tetrahydrofuran-soluble fraction of the toner has a main peak of a molecular weight distribution measured by gel permeation chromatography within a range of 11000 to 30000.

15. The electrostatic latent image developing toner according to claim 14 ,
wherein an average circularity of the toner particles is within the range of 0.940 to 0.995, and
wherein a coefficient of variation of a number particle size distribution of the toner particles is equal to or less than 20%.

16. The electrostatic latent image developing toner according to claim 14 , wherein the number of carbon atoms of the long-chain alkyl group of R 2 is equal to or less than 20.

17. The electrostatic latent image developing toner according to claim 14 , wherein the number of carbon atoms of the long-chain alkyl group of R 2 is within the range of 8 to 18.

18. The electrostatic latent image developing toner according to claim 14 , wherein the long-chain alkyl group of R 2 comprises a branched structure.

19. The electrostatic latent image developing toner according to claim 14 , wherein the releasing agent comprises a hydrocarbon releasing agent.

20. The electrostatic latent image developing toner according to claim 14 , wherein the releasing agent comprises an ester releasing agent.

Assignees

• Konica Minolta Inc

Inventors

• Matsushima Kaori
• Ueda Noboru
• Hirano Shiro
• Sugama Kouji

Classifications

• G03G9/08797

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

• G03G9/08755 Primary

  Polyesters · CPC title

• G03G9/0825

  characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093) · CPC title

• G03G9/08788

  Block polymers · CPC title

• G03G9/0821

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