Polymerization method for preparing conductive polymer

Patent metadata

Field	Value
Publication number	US-10109421-B2
Application number	US-201514661662-A
Country	US
Kind code	B2
Filing date	Mar 18, 2015
Priority date	Jan 25, 2012
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A improved process for preparing a conductive polymer dispersion is provided as is an improved method for making capacitors using the conductive polymer. The process includes providing a monomer solution and shearing the monomer solution with a rotor-stator mixing system comprising a perforated stator screen having perforations thereby forming droplets of said monomer. The droplets of monomer are then polymerized during shearing to form the conductive polymer dispersion.

First claim

The invention claimed is:

1. A process for preparing a conductive polymer dispersion comprising:
providing a monomer;
mechanically mixing said monomer to form droplets comprising said monomer; and
polymerizing said monomer in said droplet with an oxidizer thereby forming particles of intrinsically conductive polymer with a particle size of no more than 200 nm.

2. The process for preparing a conductive polymer dispersion of claim 1 further comprising providing a polyanion with said monomer.

3. The process for preparing a conductive polymer dispersion of claim 2 wherein said polyanion is polystyrene sulfonic acid.

4. The process for preparing a conductive polymer dispersion of claim 3 wherein said polystyrene sulfonic acid has a molecular weight of at least 500 to no more than 200,000.

5. The process for preparing a conductive polymer dispersion of claim 1 wherein at least one conductive polymer is an optionally substituted polypyrrole, an optionally substituted polyaniline or an optionally substituted polythiophene.

6. The process for preparing a conductive polymer dispersion of claim 5 wherein said conductive polymer is polyethlenedioxythiophene.

7. The process for preparing a conductive polymer dispersion of claim 1 further comprising:
providing at least one steric stabilizer with said monomer.

8. The process for preparing a conductive polymer dispersion of claim 7 wherein said steric stabilizer is selected from the group consisting of polyethylene oxide, fully hydrolyzed poly(vinyl alcohol), partially hydrolyzed poly(vinyl alcohol), poly(vinyl pyrollidone), hydroxyethyl cellulose, ethoxylated alkyl phenols, ethoxylated acetylenic diols, and polyethylene oxide copolymers.

9. The process for preparing a conductive polymer dispersion of claim 8 wherein said steric stabilizer is polyethylene oxide.

Assignees

• Kemet Electronics Corp

Inventors

• Chacko Antony P
• Shi Yaru
• Ols John

Classifications

• C08G2261/3323

  derived from other monocyclic systems · CPC title

• H01G9/028

  Organic semiconducting electrolytes, e.g. TCNQ · CPC title

• C08G75/06

  from cyclic thioethers · CPC title

• H01G4/08 Primary

  Inorganic dielectrics · CPC title

• H01G4/005

  Electrodes · CPC title