Polymeric particles and a method of preparing the same

• US 5,322,887 A
• Filed: 05/18/1992
• Issued: 06/21/1994
• Est. Priority Date: 05/18/1992
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Howell, Bonnie L., Whitesides, Thomas H.
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): RAJGURU, UMAKANT K
• Application Number:
  US07/884,788
• Time in Patent Office: 764 Days
• Field of Search: 523/334, 524/781, 524/430, 524/431
• US Class Current: 524/781
• CPC Class Codes: C08J 3/05 from solid polymers
• CPC Class Codes: C08J 3/2053 the additives only being premixed with a liquid phase
• CPC Class Codes: G03G 9/0804 whereby the components are brought together in a liquid dispersing medium
• CPC Class Codes: G03G 9/0825 characterised by their structure; characterised by non-homogenuous distribution of components microcapsular toners G03G9/093
• CPC Class Codes: G03G 9/09708 Inorganic compounds

Abstract

This invention provides polymeric particles uniformly coated with colloidal cupric oxide particles by forming a suspension of polymer particles as a discontinuous phase in a continuous aqueous phase containing a colloidal cupric oxide suspension stabilizer.

Claims

1. In the method of making polymeric particles by a process which comprises the formation of a suspension of polymeric particles in an aqueous phase containing a particulate suspension stabilizer, the improvement which comprises employing colloidal cupric oxide as the particulate suspension stabilizer.

2. The method claim 1 wherein the cupric oxide particulate suspension stabilizer is formed by the addition of hydroxide ion to a Cu (+2) compound in the presence of a base.

3. The method of claim 2 wherein the base is a tertiary amine or an hydroxide.

4. The method of claim 3 wherein the tertiary amine is triethyl amine.

5. The process of claim 1 wherein a promoter is added to the aqueous phase.

6. The process of claim 5 wherein the promoter is an organic sulfonate, sulfate or carboxylate having 1 to 10 carbon atoms.

7. The process of claim 5 wherein the promoter is sodium butane sulfonate.

8. The process of claim 7 wherein calcium acetate is added to the aqueous phase.

9. The method of claim 1 wherein the polymer particles are formed by suspension polymerization.

10. The method of claim 1 wherein the polymer particles are formed by polymer suspension.