Porous particles with non-porous shell

• US 8,652,637 B2
• Filed: 10/11/2007
• Issued: 02/18/2014
• Est. Priority Date: 10/11/2007
• Status: Active Grant

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Massa, Dennis J., Nair, Mridula, Jones, Tamara K., Hamilton, Dale E.
• Primary Examiner(s): Seidleck, James J
• Assistant Examiner(s): POURBOHLOUL, SARIRA CAMILLA
• Application Number:
  US11/870,651
• Publication Number:
  US 20090098382A1
• Time in Patent Office: 2,322 Days
• Field of Search: 428402-40224, 4272133-21336, 264 4- 47
• US Class Current: 428/402.24
• CPC Class Codes: G03G 9/09307 specified by the shell material
• CPC Class Codes: G03G 9/09321 obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/09328 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/09342 Inorganic compounds
• CPC Class Codes: G03G 9/0935 specified by the core material
• CPC Class Codes: G03G 9/09364 obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/09371 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: G03G 9/09385 Inorganic compounds
• CPC Class Codes: G03G 9/09392 Preparation thereof
• CPC Class Codes: Y10T 428/2989 Microcapsule with solid core [includes liposome]
• CPC Class Codes: Y10T 428/2993 Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer

Abstract

The present invention is core-shell polymer particles comprising a common binder polymer for the core and the shell wherein the core has a porosity and the shell is non-porous The particles have a porosity from 10 to 70 percent.

Claims

1. A core-shell polymer particle comprising a common binder polymer for the core and the shell wherein the core has a porosity and the shell is non-porous and the particle has a porosity of from 10 to 70 percent.

2. The core-shell polymer particle of claim 1 further comprises pigments, waxes, shape control agents and charge control agents.

3. The core-shell polymer particle of claim 1 wherein the binder polymer is selected from the group consisting of polyesters;

polymers of styrenes, monoolefins, vinyl chloride, vinyl esters, methylene aliphatic monocarboxylic acid esters, vinyl ethers and vinyl ketones.

4. The core-shell polymer particle of claim 1 wherein the particle has a size of from 2 to 50 microns.

5. A core-shell toner particle comprising a common binder polymer for the core and the shell wherein the core has a porosity and the shell is non-porous and the particle has a porosity of from 10 to 70 percent.

6. The core-shell toner particle of claim 5 further comprises pigments, waxes, shape control agents and charge control agents.

7. The core-shell toner particle of claim 5 further comprising colorants.

8. The core-shell toner particle of claim 7 wherein the colorants are selected from the group consisting of carbon black, aniline blue, calcoil blue, chrome yellow, ultramarine blue, Du Pont oil red, quinoline yellow, methylene blue chloride, phthalocyanine blue, malachite green oxalate, lamp black, rose bengal, C.I. Pigment Red 48:

1, C.I. Pigment Red 122, C.I. Pigment Red 57;

1, C.I. Pigment Yellow 97, C.I. Pigment Yellow 12, C.I. Pigment Yellow 17, C.I. Pigment Blue 15;

1 and C.I. Pigment Blue 15;

3.

9. The core-shell toner particle of claim 5 further comprising release agents.

10. The core-shell toner particle of claim 5 further comprising flow aids.

11. The core-shell toner particle of claim 10 wherein the flow aids comprises from about 0.05 to about 10 weight percent of the toner binder weight.