# US 4,395,362 A · Electroconductive resin composite material for molding

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- Number: US 4,395,362 A
- Document ID: US4395362A
- Status: Granted
- Kind: A
- Application number: 06/296,523
- Filed: 1981-08-26
- Granted: 1983-07-26
- Earliest claimed: 1981-08-26
- Assignees: Kureha Kagaku Kogyo Kabushiki Kaisha
- Inventors: Hiroaki Satoh; Masaru Hiruta
- Web page: https://patentgrep.com/patent/US4395362A

## CPC

- H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon
- C08K 3/04: Carbon
- C08K 7/06: Elements
- C08L 23/10: Homopolymers or copolymers of propene
- C08L 23/12: Polypropene
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08L 23/26: modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876)
- C08L 23/30: by oxidation
- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

An electroconductive resin composite material for molding having excellent mechanical strength and electrical properties. The resin comprises 100 parts by weight of polypropylene, from 10 to 50 parts by weight of a modified polypropylene obtained either by chemically modifying polypropylene with an organic unsaturated carboxylic acid or by copolymerizing propylene and the organic unsaturated carboxylic acid, from 5 to 65 parts by weight of carbon fiber having a diameter of 5 to 20 micrometers, the ratio of length to diameter of the fiber being not less than 10, and from 5 to 65 parts by weight of electroconductive carbon black, the specific surface area being at least 800 m.sup.2 /g.

## Claims

### Claim 1

A resin composite material consisting essentially of 100 parts by weight of polypropylene, from 10 to 50 parts by weight of a modified polypropylene, said modified polypropylene being polypropylene chemically modified with an organic unsaturated carboxylic acid of 3 to 10 carbon atoms or a copolymer of propylene and an organic unsaturated carboxylic acid of 3 to 10 carbon atoms, said modified polypropylene containing 0.5 to 8.0 mol% of said organic unsaturated carboxylic acid as carboxylic acid units, from 5 to 65 parts by weight of carbon fiber having a diameter of from 5 to 20 micrometers and a ratio of length to diameter of not less than 10 and from 5 to 65 parts by weight of electroconductive carbon black having a specific surface area of not less than 800 m.sup.2 /g.

### Claim 2 (depends on 1)

The resin composite material of claim 1, wherein the total amount of polypropylene and modified polypropylene is more than 60% by weight of the total amount of said composite material.

### Claim 3 (depends on 1)

The resin composite of claim 1 containing from 10 to 40 parts by weight of carbon fiber.

### Claim 4 (depends on 1)

The resin composite of claim 1 containing from 10 to 40 parts by weight of electroconductive carbon black.

### Claim 5 (depends on 1)

The resin composite material of claim 1 wherein the carboxyclic acid is selected from the group consisting of maleic, acrylic methacrylic, endobicyclo [2,2,1]5-heptene-2,3-dicarboxylic and itaconic acids and their anhydrides.

### Claim 6 (depends on 5)

The resin composite of claim 5 wherein the carboxylic acid is maleic acid.

### Claim 7 (depends on 1)

The resin composite of claim 1 wherein the modified polypropylene contains from 1 to 5 mol% of said organic unsaturated carboxylic acid as carboxylic acid units.