# US 7,744,778 B2 · Polymeric surfactant for high dielectric polymer composites, method of preparing the same and high dielectric polymer composite comprising the same

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- Number: US 7,744,778 B2
- Document ID: US7744778B2
- Status: Granted
- Kind: B2
- Application number: 11/961,011
- Filed: 2007-12-20
- Published: 2008-08-07
- Granted: 2010-06-29
- Earliest claimed: 2007-02-06
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Eun Sung Lee; Sang Mock Lee; Young Hun Byun; Jin Young Bae
- Web page: https://patentgrep.com/patent/US7744778B2

## CPC

- H01G 4/206: {inorganic and synthetic material}
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)

## Abstract

Disclosed is a polymeric surfactant for high dielectric polymer composites, a method of preparing the same, and a high dielectric polymer composite including the same. The polymeric surfactant for high dielectric polymer composites, which includes a head portion having high affinity for a conductive material and a tail portion having high affinity for a polymer resin, forms a passivation layer surrounding the conductive material in the high dielectric polymer composite including the polymeric surfactant, thus ensuring and controlling a high dielectric constant.

## Claims

### Claim 1

A polymer composite, comprising:
a polymeric surfactant including a tail portion composed of a backbone and one or more first side chains connected to the backbone, wherein the first side chains are hydrophilic or hydrophobic,
a head portion connected to the backbone containing a side chain having an arylamine functional group,
wherein the polymeric surfactant is represented by Formula 10 below:
wherein in Formula 10, x, z and w each range from 1 to 50,
e ranges from 1 to 20, and
n ranges from 1 to 50;
wherein the polymeric surfactant has a number average molecular weight of from 1,000 to 30,000;
a conductive material selected from a group consisting of carbon black, carbon nanotubes, carbon nanowires, carbon fibers, and graphite; and
a polymer resin;
wherein the head portion is bound to the conductive material through chemical reaction and the tail portion is oriented toward the polymer resin.

### Claim 2 (depends on 1)

The polymer composite as set forth in claim 1, wherein the polymer resin comprises one or more selected from a group consisting of epoxy, polyimide, silicon polyimide, silicone, polyurethane, and benzocyclobutene.

### Claim 3 (depends on 1)

The polymer composite as set forth in claim 1, wherein the polymer composite comprises 10˜80 parts by weight of the polymeric surfactant based on 100 parts by weight of the conductive material; and 50˜98 vol % of the polymer resin based on a total volume of the polymer composite.

### Claim 4 (depends on 1)

A capacitor, comprising the polymer composite of claim 1.