Toner particles of controlled morphology

• US 20070298346A1
• Filed: 06/22/2006
• Published: 12/27/2007
• Est. Priority Date: 06/22/2006
• Status: Abandoned Application

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Wilson, John C., Ezenyilimba, Matthew C., McGrath, Gretchen S.
• Application Number:
  US11/472,779
• Publication Number:
  US 20070298346A1
• Time in Patent Office: Days
• US Class Current: 430/137.1
• CPC Class Codes: C08J 2325/14 with unsaturated esters
• CPC Class Codes: C08J 2333/06 of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C08J 2367/00 Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08J2377/12; of polyester-imides C08J2379/08; Derivatives of such polymers
• CPC Class Codes: C08J 3/07 from polymer solutions
• CPC Class Codes: C08K 5/55 Boron-containing compounds C08K5/0091 takes precedence
• CPC Class Codes: G03G 9/0804 whereby the components are brought together in a liquid dispersing medium
• CPC Class Codes: G03G 9/0815 Post-treatment
• CPC Class Codes: G03G 9/0827 characterised by their shape, e.g. degree of sphericity
• CPC Class Codes: G03G 9/08711 with esters of acrylic or methacrylic acid
• CPC Class Codes: G03G 9/08755 Polyesters
• CPC Class Codes: G03G 9/09741 cationic

Abstract

A method for the preparation of electrostatographic toner comprising the steps of: a) dissolving a polymer material and a quaternary ammonium tetraphenylborate salt in an organic solvent to form an organic phase; b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer to form a dispersion and homogenizing the resultant dispersion; c) evaporating the organic solvent and recovering a resultant product; and d) washing and drying the resultant product.

Claims

1. A method for the preparation of electrostatographic toner comprising the steps of:

a) dissolving a polymer material and a quaternary ammonium tetraphenylborate salt in an organic solvent to form an organic phase;

b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer to form a dispersion and homogenizing the resultant dispersion;

c) evaporating the organic solvent and recovering a resultant product; and

d) washing and drying the resultant product.

2. The method of claim 1 wherein the quaternary ammonium tetraphenylborate salt is selected from the group consisting of

3. The method of claim 1 wherein a charge control agent is added in step a).

4. The method of claim 1 wherein a pigment is added in step a).

5. The method of claim 4 wherein the pigment comprises from 4 to 20 weight percent of the resultant product.

6. The method of claim 1 wherein a promoter is added in the dispersing step in b).

7. The method of claim 1 wherein the solvent is selected from the group consisting of chloroform, dichloromethane, ethyl acetate, vinyl chloride, and methyl ethyl ketone.

8. The method of claim 1 wherein the amount of particulate stabilizer is between 1 to 15 parts, by weight, based on 100 parts of total solids in the toner.

9. The method of claim 1 wherein the ratio of the aqueous phase to the organic phase, by volume, ranges from 1:

1 to 9;

1.

10. The method of claim 1 wherein the organic phase contains lubricants.

11. The method of claim 1 wherein the organic phase contains waxes.

12. The method of claim 1 wherein the polymer material is a homopolymer or copolymer.

13. The method of claim 12 wherein the homopolymer or copolymer is selected from the group consisting of polyethylene, polypropylene, polyisobutylene, polyisopentylene, polytrifluoroolefins, polyamides, acrylic resins, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-ethyl methacrylate copolymers, polystyrene and copolymers of styrene with unsaturated monomers, polyesters, polyvinyl resins, ethylene-allyl alcohol copolymers, polytetrafluoroethylene, polytrifluorochloroethylene, poly(hexamethylene adipamide), poly(hexamethylene sebacamide), polycaprolactam, poly(methyl methacrylate), poly(methyl acrylate), poly(ethyl methacrylate) and poly(styrene-methyl methacrylate).

14. The method of claim 1 wherein the polymer material is polyester.

15. The method of claim 1 wherein the polymer material is butyl acrylate-styrene copolymer.