# US 9,518,177 B2 · Composite material for means of transport including polypropylene resin and long carbon fiber

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- Number: US 9,518,177 B2
- Document ID: US9518177B2
- Status: Granted
- Kind: B2
- Application number: 14/897,254
- Filed: 2013-09-12
- Published: 2016-05-19
- Granted: 2016-12-13
- Earliest claimed: 2013-06-21
- Assignees: Korea Institute of Industrial Technology
- Applicants: Korea Institute of Industrial Technology
- Inventors: Dong Hyun Kim; Dae Young Lim; Ki Young Kim; No Hyung Park; Hyo Jin An; Jung Soo Kim; Eun Soo Lee
- Web page: https://patentgrep.com/patent/US9518177B2

## CPC

- C08L 23/12: Polypropene
- C08K 7/02: Fibres or whiskers
- C08K 7/06: Elements
- C08L 23/10: Homopolymers or copolymers of propene
- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention relates to a composite material for a transport, including a polypropylene resin and a carbon long fiber, and more particularly, to a fiber reinforced composite material composition for a transport including 40-90 wt % of a polypropylene resin, 5-60 wt % of a carbon long fiber having a fiber diameter of 1-50 μm and a weight average fiber length of 20-150 mm, and 0.3-10 wt % of a compatibilizer. The compatibilizer includes one selected from the group consisting of an ionomer, a copolymer of propylene-polar monomer, a modification water added polymer and combinations thereof. The composite material has improved interface properties between the polypropylene resin and the carbon long fiber owing to a specific compatibilizer, improved rigidity, impact resistance and heat resistance, and may be applied to various fields requiring the fiber reinforced composite material as well as various transports including an automobile.

## Claims

### Claim 1

A fiber reinforced composite material composition for a transport, comprising 40-90 wt % of a polypropylene resin, 5-60 wt % of a carbon long fiber having a fiber diameter of 1-50 μm and a weight average fiber length of 20-150 mm, and 0.3-10 wt % of a compatibilizer,
wherein the compatibilizer is styrene based block copolymer selected from the group consisting of styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-butylene-ethylene block copolymer, styrene-ethylene-propylene-styrene block copolymer, styrene-ethylene-propylene block copolymer and combinations thereof.

### Claim 2 (depends on 1)

The fiber reinforced composite material composition for a transport of claim 1, wherein the polypropylene resin is a polypropylene single polymer or a copolymer of polypropylene and alpha olefin.

### Claim 3 (depends on 2)

The fiber reinforced composite material composition for a transport of claim 2, wherein the alpha olefin comprises one selected from the group consisting of 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene and combinations thereof.

### Claim 4 (depends on 1)

The fiber reinforced composite material composition for a transport of claim 1, wherein the fiber reinforced composite material composition for a transport satisfies physical properties as follows: a breaking strength of 50 MPa or more, a tensile modulus of 6 GPa or more, a flexural rigidity of 180 MPa or more, an impact resistance strength of 30 KJ/m2 or more, and a thermal decomposition temperature of 400° C. or more.