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Polymerization process for preparing conductive polymers

A conductive polymer and mixing system technology, applied in the direction of conductive materials, conductive materials, fixed capacitor parts, etc., can solve the problems of reducing the particle size of the dispersion, affecting the long-term performance of the device, and affecting the stability of the dispersion. to reduce the number of

Active Publication Date: 2017-04-05
KEMET ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The production method described in the prior art has the disadvantage that additional process steps are required to reduce the particle size of the dispersion, such as high-pressure homogenization
The presence of any undesired electrolyte or ionic surfactants in these binders can affect the stability of the dispersion and can affect the long-term performance of the device
It is known that electrostatic stabilization has various disadvantages relative to other stabilization methods, which are described in Polymeric Materials Encyclopedia, CRC Press, Vol. 1, p. 8025

Method used

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  • Polymerization process for preparing conductive polymers
  • Polymerization process for preparing conductive polymers
  • Polymerization process for preparing conductive polymers

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0086] First, 125 g of PSSA, 3375 g of DI water, 28.5 g of 1% iron(III) sulfate, and 21.5 g of sodium bisulfate peroxide were added to a 4 L plastic bottle with a cooling jacket. The percent solids added was 1.37%. The contents were mixed using a rotor-stator mixing system with a perforated stator screen with a square hole size of 2.54 mm. Next, 11.25 g of 3,4-ethylenedioxythiophene (PEDOT) was added dropwise. The reaction mixture was sheared continuously for an additional 23 hours with the rotor-stator mixing system at varying shear rates from 3000 RPM to 6000 RPM. The resulting dispersion was treated with cation and anion exchangers and filtered. The viscosity of the dispersion was measured with a Brookfield RVII viscometer using a No. 3 spindle. Particle sizes were measured with a disc centrifugal particle sizer from CPS Instruments and are reported here as weight medians. Conductivity was measured by coating a dispersion with 8% DMSO on a glass slide, followed by dryin...

Embodiment 2

[0088] A similar experiment to Example 1 of the present invention was repeated except that the shear rate was fixed at 6000 RPM throughout the reaction.

Embodiment 3

[0090] An experiment similar to that of Example 1 of the present invention was repeated except that a perforated stator screen having a circular hole diameter of 1.6 mm was used.

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Abstract

Improved processes for preparing conductive polymer dispersions are provided, as well as improved methods of making capacitors using the conductive polymers. The process includes providing a monomer solution and shearing the monomer solution with a rotor-stator mixing system comprising a perforated stator screen with perforations to form droplets of the monomer. Subsequently, the droplets of the monomer are polymerized in a shearing process to form a conductive polymer dispersion.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Pending Provisional Patent Application No. 61 / 590,381, filed January 25, 2012, which is incorporated herein by reference. Background technique [0003] The present invention relates to an improved polymerization process for preparing conductive polymer dispersions and improved solid electrolytic capacitors formed therefrom. More specifically, the present invention relates to the preparation of improved conductive polymer dispersions with controllable particle sizes (in particular, particle sizes below about 100 nm) without the need for additional postpolymerization homogenization . [0004] Solid electrolytic capacitors are widely used throughout the electronics industry. In high-voltage applications, solid electrolytic capacitors with solid electrolytes formed from conductive polymer dispersions exhibit superior high-voltage performance compared to in-situ formed conductive polym...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/00C08G75/00C08L101/12H01B1/12C08L79/00
CPCC08L65/00H01G9/0036H01G9/028C08L25/18C08L71/02C08G2261/1424C08G2261/3321C08G2261/3323H01B1/127H01G9/0029H01G9/025C08G75/06H01G4/005H01G4/08
Inventor 约翰·奥尔斯史亚茹安东尼·P·查科
Owner KEMET ELECTRONICS CORP