Polymer composites of high dielectric constant and low dielectric dissipation

Patent metadata

Field	Value
Publication number	US-2020291202-A1
Application number	US-201816487133-A
Country	US
Kind code	A1
Filing date	Apr 18, 2018
Priority date	May 12, 2017
Publication date	Sep 17, 2020
Grant date	—

Abstract

A composition comprising: a) electrically conductive fibers comprising carbon, a conductive oxide, or a metal; and having an average diameter from 1 to 20,000 nm and an average length at least five times the average diameter; and b) electrically nonconductive particles with an average diameter from 1 to 20,000 nm.

First claim

1 . A composition comprising:
a) electrically conductive fibers comprising carbon, or a conductive oxide, and having an average diameter from 1 to 20,000 nm and an average length at least five times the average diameter; b) electrically nonconductive particles with an average diameter from 1 to 20,000 nm; and c) a polysiloxane polymer matrix surrounding said electrically conductive fibers and said electrically nonconductive particles

2 . The composition of claim 1 , wherein the electrically nonconductive particles are absorbed on the electrically conductive fibers.

3 . (canceled)

4 . The composition of claim 1 in which said electrically conductive fibers have an average diameter from 3 nm to 1,000 nm and have an electrical conductivity from 10 to 1×10 8 S/m.

5 . The composition of claim 2 in which said electrically nonconductive particles have an average diameter from 5 nm to 1,000 nm and have an electrical conductivity no greater than 0.1 S/m.

6 . A method comprising:
c) creating a surface electric charge on a fibrous material by physical adsorption or chemical oxidation, d) adding a particulate material bearing opposite charge on the surface to form a mixture, and e) combining the mixture with a polysiloxane polymer or polysiloxane resin.

7 . The method of claim 6 in which the particulate material has an average diameter from 5 nm to 1,000 nm and an electrical conductivity no greater than 0.1 S/m.

8 . The method of claim 7 in which the fibrous material has an average diameter from 3 nm to 1,000 nm and have an electrical conductivity from 10 to 1×10 8 S/m.

9 . (canceled)

10 . The method of claim 7 in which a polysiloxane is formed by curing a curable siloxane material in the presence of the conductive fibrous material and the particulate material.

Assignees

• Dow Silicones Corp

Inventors

• Zhu Bizhong

Classifications

• C08K7/08

  Oxygen-containing compounds · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K2201/001

  Conductive additives · CPC title

• C08K2201/004

  Additives being defined by their length · CPC title

• C08K7/16

  Solid spheres · CPC title