# US 2014/0193597 A1 · Resin fuel tube

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- Number: US 2014/0193597 A1
- Document ID: US20140193597A1
- Status: Published application
- Kind: A1
- Application number: 14/202,632
- Filed: 2014-03-10
- Published: 2014-07-10
- Earliest claimed: 2012-03-26
- Assignees: Tokai Rubber Industries, Ltd.
- Applicants: Tokai Rubber Industries, Ltd.
- Inventors: Takashi Yajima; Koji Mizutani; Kazutaka Katayama
- Web page: https://patentgrep.com/patent/US20140193597A1

## CPC

- F16L 11/06: with homogeneous wall (F16L11/11 takes precedence)
- B32B 1/08: Tubular products
- B32B 27/08: of synthetic resin
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE}
- B32B 27/327: {comprising polyolefins obtained by a metallocene or single-site catalyst}
- B32B 27/34: comprising polyamides
- C08L 23/10: Homopolymers or copolymers of propene
- F02M 37/0017: {related to fuel pipes or their connections, e.g. joints or sealings (F02M55/004 takes precedence)}
- F16L 11/111: {with homogeneous wall}
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2314/06: Metallocene or single site catalysts
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A resin fuel tube is provided, which includes at least one resin layer, wherein the resin layer is made of a resin composition comprising: (A) a polypropylene prepared through polymerization with the use of a metallocene catalyst; and (B) a polypropylene material having a melting point of 137° C. to 160° C., the resin composition having a mixing weight ratio of the components (A) and (B) satisfying (A)/(B)=95/5 to 50/50, wherein the resin layer has a structure such that a soft structural portion (Y) of the component (A) intrudes into a space between crystalline structural portions (X) of the component (B). Therefore, the resin fuel tube is light-weight, excellent in impact resistance and heat resistance, free from fuel leakage, and usable in an atmosphere at 130° C. or higher, for example, in an automotive engine room or the like.

## Claims

### Claim 1

A resin fuel tube comprising at least one resin layer,
wherein the resin layer is made of a resin composition comprising:
(A) a polypropylene prepared through polymerization with the use of a metallocene catalyst; and
(B) a polypropylene material having a melting point of 137° C. to 160° C.,
the resin composition having a mixing weight ratio of the components (A) and (B) satisfying (A)/(B) is from 95/5 to 50/50,
wherein the resin layer has a structure such that a soft structural portion (Y) of the component (A) intrudes into a space between crystalline structural portions (X) of the component (B).

### Claim 2 (depends on 1)

The resin fuel tube according to claim 1, wherein the resin composition forming the resin layer further comprises an ionic liquid.