Toner particle processing

Patent metadata

Field	Value
Publication number	US-9086641-B2
Application number	US-201313939911-A
Country	US
Kind code	B2
Filing date	Jul 11, 2013
Priority date	Jul 11, 2013
Publication date	Jul 21, 2015
Grant date	Jul 21, 2015

Abstract

A process includes adding a particulate toner additive to toner particles to form a slurry, filtering the slurry to form a filter cake, the particulate toner additive functioning as a filtration aid, and washing the filter cake, after the washing step the toner particles have a portion of the particulate toner additive adhered thereto, and de-agglomerating/drying the toner particles with the additive, after the drying step the toner particles have a portion of the particulate toner additive adhered thereto.

First claim

What is claimed is:

1. A process comprising:
adding a particulate poly(methyl methacrylate) to toner particles to form a slurry;
filtering the slurry to form a filter cake; and
washing the filter cake; and drying the filter cake;
wherein after the washing and drying steps the toner particles have a portion of the particulate poly(methyl methacrylate) adhered thereto.

2. The process of claim 1 , wherein the particulate poly(methyl methacrylate) is present in an amount in a range from about 0.1 percent to about 10 percent by weight of the solid loading of the slurry.

3. The process of claim 1 , wherein the particulate poly(methyl methacrylate) has an average particle size in a range from about 0.15 microns to about 1.5 microns.

4. The process of claim 1 , wherein the toner particles comprise a volume-median particle size (D 50v ) in a range from about 3 microns to about 9 microns.

5. The process of claim 1 , wherein the toner particles comprise a volume-median particle size in a range from about 3 to about 4 microns.

6. A process comprising:
adding a particulate poly(methyl methacrylate) to super-fine toner particles to form a slurry;
filtering the slurry to form a filter cake;
washing the filter cake; and drying the toner particles;
wherein after the washing and drying steps the super-fine toner particles have a portion of the particulate poly(methyl methacrylate) adhered thereto.

7. The process of claim 6 , wherein the particulate poly(methyl methacrylate) is present in an amount in a range from about 0.1 percent to about 10 percent by weight of the solid loading of the slurry.

8. The process of claim 6 , wherein the particulate poly(methyl methacrylate) has an average particle size in a range from about 0.15 microns to about 1.5 microns.

9. The process of claim 6 , wherein the super-fine toner particles comprise a volume-median particle size in a range from about 3 to about 4 microns.

Assignees

• Xerox Corp

Inventors

• Malachowski Steven M
• Young Eric Joseph
• Schneider Jay L

Classifications

• G03G9/0815 Primary

  Post-treatment · CPC title

• G03G9/09725

  Silicon-oxides; Silicates · CPC title

• G03G9/097

  Plasticisers; Charge controlling agents · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/09708

  Inorganic compounds · CPC title