Method and system for magnetic actuated mixing to prepare latex emulsion

• US 8,871,420 B1
• Filed: 04/10/2013
• Issued: 10/28/2014
• Est. Priority Date: 04/10/2013
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Liu, Yu, Zhou, Ke, Wang, Yulin, Lee, Frank Ping-Hay
• Primary Examiner(s): LE, HOA VAN
• Application Number:
  US13/860,474
• Publication Number:
  US 20140308612A1
• Time in Patent Office: 566 Days
• Field of Search: 430/137.19
• US Class Current: 430/137.19
• CPC Class Codes: B01F 33/251 using balls as loose mixing element
• CPC Class Codes: B01F 33/451 wherein the mixture is directly exposed to an electromagnetic field without use of a stirrer, e.g. for material comprising ferromagnetic particles or for molten metal
• CPC Class Codes: B01F 33/452 using independent floating stirring elements
• CPC Class Codes: C08K 5/05 Alcohols; Metal alcoholates
• CPC Class Codes: C08K 5/07 Aldehydes; Ketones

Abstract

A method and system for magnetic actuated mixing which use magnetic particles and magnetic field to facilitate the mixing for preparing latex emulsion. In embodiments, a suitable process includes dissolving a resin in an organic solvent, optionally adding a surfactant, adding a neutralization agent and water, adding magnetic particles, and subjecting the mixture to a magnetic actuated mixing to form a latex emulsion. In embodiments, the latex emulsion thus produced may be utilized to form a toner.

Claims

1. A method for mixing one or more materials to prepare latex particles, comprising:

a) contacting a resin with an organic solvent, an optional surfactant, and an optional neutralizing agent in a vessel to form a resin composition in the vessel;

b) contacting the resin composition with deionized water (DIW) in the vessel;

c) adding magnetic particles into the vessel; and

d) applying a varying magnetic field to the magnetic particles to move the magnetic particles to mix the resin composition in the vessel to generate a latex or emulsion, wherein the step of applying the varying magnetic field to the magnetic articles creates a plurality of localized micron or submicron mixing zones providing substantially uniform latex particles.

2. The method of claim 1, wherein a neutralization ratio of the neutralization agent in the latex or emulsion is from 25% to 500%.

3. The method of claim 1, wherein the organic solvent is selected from the group consisting of a ketone, an alcohol, an ester, an ether, a nitrile, a sulfone, a sulfoxide, a phosphoramide, a benzene, a benzene derivative, an amine, and mixtures thereof.

4. The method of claim 1, wherein the resin is selected from the group consisting of polyester, polyacrylate, polyolefin, polystyrene, polycarbonate, polyamide, polyimide, and mixtures thereof.

5. The method of claim 1, wherein the resin is a polyester.

6. The method of claim 1, wherein the latex or emulsion has a mono distribution of particle size from about 5 nm to about 1000 nm.

7. The method of claim 1, wherein the neutralizing agent is selected from the group consisting of ammonium hydroxide, sodium carbonate, potassium hydroxide, sodium hydroxide, sodium bicarbonate, lithium hydroxide, potassium carbonate, triethyl amine, triethanolamine, pyridine, pyridine derivatives, diphenylamine, diphenylamine derivatives, poly(ethylene amine), poly ethylene amine) derivatives, amine bases, and piperazine, and mixtures thereof.

8. The method of claim 1, further including collecting the magnetic particles for reusing at a later time.

9. The method of claim 1, wherein the magnetic particles are comprised of a, paramagnetic, ferrimagnetic, ferromagnetic or antiferromagnetic material.

10. The method of claim 1, wherein the magnetic particles have a non-magnetic coating.

11. The method of claim 1, wherein the magnetic particles have a particle diameter size of from about 5 nm to about 50 μ

m.

12. The method of claim 1, wherein the magnetic field has a strength of from about 500 Gauss to about 20,000 Gauss.

13. The method of claim 1, wherein the magnetic field is applied through one or more electromagnets.

14. The method of claim 1, wherein the magnetic field is applied to drive magnetic particles in a circular, up and down, left and right, or triangular motion.

15. The method of claim 1, wherein the varying magnetic field is applied by moving a permanent magnet.

16. The method of claim 1, wherein the desired latex particle size is from about 5 nm to about 1,000 nm.

17. A method for mixing one or more materials to prepare toner particles, comprising:

a) contacting a resin with an organic solvent and an optional neutralizing agent in a vessel to form a resin composition in the vessel;

b) contacting the resin composition with deionized water (DIW) in the vessel;

c) adding magnetic particles into the vessel;

d) applying a varying magnetic field to the magnetic particles to move the magnetic particles to mix the resin composition in the vessel to generate a latex or emulsion;

e) particles from a pre-toner mixture, the pre-toner mixture comprising the latex or emulsion, an optional colorant, and an optional wax; and

f) coalescing the aggregated particles to form toner particles.