Image forming system comprising effective imaging apparatus and toner pairing

• US 8,971,764 B2
• Filed: 03/29/2013
• Issued: 03/03/2015
• Est. Priority Date: 03/29/2013
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Klenkler, Richard A., McGuire, Gregory, Vella, Sarah J., Song, Guiqin, Liu, Yu, Cote, Adrien P.
• Primary Examiner(s): GRAY, FRANCIS C
• Application Number:
  US13/853,970
• Publication Number:
  US 20140294443A1
• Time in Patent Office: 704 Days
• Field of Search: 399/159, 399/252, 399/253, 399/343, 399/350, 430/62, 430/108.6, 430/123.3
• US Class Current: 399/159
• CPC Class Codes: G03G 15/08 using a solid developer, e.g. powder developer
• CPC Class Codes: G03G 21/0011 using a blade; Details of cleaning blades, e.g. blade shape, layer forming
• CPC Class Codes: G03G 2215/00957 Compositions
• CPC Class Codes: G03G 9/09791 Metallic soaps of higher carboxylic acids

Abstract

The presently disclosed embodiments relate generally to image forming systems comprising imaging apparatus members and toner compositions. More specifically, the present embodiments relate to an improved BCR xerographic system comprising (1) a cleaning blade comprising a material having a certain Share A Hardness; (2) a photoreceptor having a surface with a specified Young'"'"'s Modulus and; and (3) a toner lubricant additive. The combined system demonstrates a significant increase an overall service life of the system.

Claims

1. An image forming system comprising:

an image forming apparatus for forming images further comprising

an imaging member having a charge retentive-surface for developing an electrostatic latent image thereon, wherein a surface of the imaging member has a Young'"'"'s Modulus of 2 GPa or greater,

a charging unit comprising a charging roller disposed within charging distance of the surface of the imaging member, and

a cleaning blade for cleaning the surface of the imaging member, wherein the cleaning blade comprises a material having a Shore A Hardness of 76 or greater; and

a toner composition for use in the image forming apparatus to form the images further comprising

toner parent particles, and

one or more additives comprising a lubricating stearate having a mode particle size of about 7 microns or less and a polymethylmethacrylate having a particle size of from about 0.3 μ

m to about 1.0 μ

n;

wherein printed images formed with the image forming system do not exhibit deletion.

2. The system of claim 1, wherein the lubricating stearate comprises zinc stearate.

3. The image forming system of claim 1, wherein the surface of the imaging member has a Young'"'"'s Modulus of from about 3 to about 4.5 GPa.

4. The image forming system of claim 1, wherein the surface of the imaging member has a water contact angle of 90°

or greater.

5. The image forming system of claim 4, wherein the surface of the imaging member has a water contact angle of from about 90°

to about 100°

.

6. The imaging forming system of claim 1, wherein the cleaning blade comprises a material having a Shore A Hardness of from about 76 to about 85.

7. The image forming system of claim 1, wherein the cleaning blade comprises an elastomeric material selected from the group consisting of urethanes, butadienes, fluoro-elastomers, fluorosilicone, and mixtures thereof.

8. The image forming system of claim 1, wherein the zinc stearate has a mode particle size of about 6 microns or less.

9. The image forming system of claim 1, wherein the zinc stearate has a mode particle size of from about 4 to about 7 microns.

10. The image forming system of claim 1, wherein zinc stearate is present in an amount of from about 2.00 weight percent to about 0.01 weight percent by the total weight of the toner composition.

11. The image forming system of claim 1, wherein the zinc stearate is present in a weight ratio to the toner parent particle of from about 2.00:

100 to about 0.01;

100.

12. The image forming system of claim 1, wherein polymethylmethacrylate is present in an amount of from about 2.00 weight percent to about 0.01 weight percent by the total weight of the toner composition.

13. The image forming system of claim 1, wherein the polymethylmethacrylate is present in a weight ratio to the toner parent particle of from about 2.00:

100 to about 0.01;

100.

14. An image forming system comprising:

an image forming apparatus for forming images further comprising

an imaging member having a charge retentive-surface for developing an electrostatic latent image thereon, wherein the imaging member comprises;

a substrate,

one or more photoconductive layers disposed on the substrate, and

an overcoat layer disposed on the one or more photoconductive layers, wherein a surface of the overcoat layer has a Young'"'"'s Modulus of 2 GPa or greater,

a charging unit comprising a charging roller disposed within charging distance of the surface of the imaging member, and

a cleaning blade for cleaning the surface of the imaging member, wherein the cleaning blade comprises a material having a Shore A Hardness of 76 or greater; and

a toner composition for use in the image forming apparatus to form the images further comprising

toner parent particles, and

one or more additives comprising zinc stearate having a mode particle size of about 7 microns or less and a polymethylmethacrylate having a particle size of from about 0.3 μ

m to about 1.0 μ

m.

15. The image forming system of claim 14, wherein the overcoat layer comprises a crosslinked organic matrix.

16. The image forming system of claim 14, wherein the overcoat layer comprises an inorganic oxide.

17. An image forming system comprising:

an image forming apparatus for forming images further comprising

an imaging member having a charge retentive-surface for developing an electrostatic latent image thereon, wherein a surface of the imaging member has a Young'"'"'s Modulus of 2 GPa or greater,

a charging unit comprising a charging roller disposed within charging distance of the surface of the imaging member, and

a cleaning blade for cleaning the surface of the imaging member, wherein the cleaning blade comprises a material having a Shore A Hardness of 76 or greater; and

a lubricant additive for lubricating the surface of the imaging member comprising a zinc stearate having a mode particle size 6 microns or less; and

a toner additive comprising a polymethylmethacrylate having a particle size of from about 0.3 μ

m to about 1.0 μ

m.