FUEL HOSE

• US 20070231521A1
• Filed: 03/22/2007
• Published: 10/04/2007
• Est. Priority Date: 03/28/2006
• Status: Abandoned Application

• Current Assignee: Tokai Rubber Industries Limited
• Original Assignee: Tokai Rubber Industries Limited
• Inventors: KATAYAMA, Kazutaka, KASAHARA, Kazuhito
• Application Number:
  US11/689,807
• Publication Number:
  US 20070231521A1
• Time in Patent Office: Days
• US Class Current: 428/36.910
• CPC Class Codes: B32B 1/08 Tubular products
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2250/03 3 layers
• CPC Class Codes: B32B 2250/244 All polymers belonging to those covered by group B32B27/36
• CPC Class Codes: B32B 2264/0207 Particles made of materials belonging to B32B25/00
• CPC Class Codes: B32B 2264/0221 Thermoplastic elastomer particles
• CPC Class Codes: B32B 2264/105 Metal
• CPC Class Codes: B32B 2264/108 Carbon, e.g. graphite particles
• CPC Class Codes: B32B 2264/12 Mixture of at least two particles made of different materials
• CPC Class Codes: B32B 2270/00 Resin or rubber layer containing a blend of at least two different polymers
• CPC Class Codes: B32B 2274/00 Thermoplastic elastomer material
• CPC Class Codes: B32B 2307/202 Conductive
• CPC Class Codes: B32B 2307/21 Anti-static
• CPC Class Codes: B32B 2307/712 Weather resistant
• CPC Class Codes: B32B 2597/00 Tubular articles, e.g. hoses, pipes
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: F16L 11/04 made of rubber or flexible plastics
• CPC Class Codes: F16L 2011/047 with a diffusion barrier layer
• CPC Class Codes: Y10T 428/1393 : Multilayer [continuous layer]

Abstract

A fuel hose which is less permeable to automotive fuels and excellent in low temperature property, hydrolysis resistance, weather resistance and ozone resistance. The fuel hose comprises an inner layer which contacts a fuel being transported, a fuel-permeation-resistant layer provided on an outer peripheral surface of the inner layer and an outer layer provided on an outer peripheral surface of the fuel-permeation-resistant layer, the inner layer being formed by the following (A), the fuel-permeation-resistant layer being formed by the following (B), and the outer layer being formed by the following (C):

• (A) an alloy of elastomer components or a polyester resin softened by copolymerization;
• (B) at least one polyester resin of polybutylene naphthalate (PBN) and polybutylene terephthalate (PBT);
• (C) a polymer having flexural modulus of 350 to 650 MPa obtained by blending at least one selected from the group consisting of polymer particles each having a core-shell structure, ethylene acrylic elastomer (AEM) and a styrene-isobutylene block copolymer into polybutylene terephthalate (PBT).

Claims

1. A fuel hose comprising an inner layer which contacts a fuel being transported, a fuel-permeation-resistant layer provided on an outer peripheral surface of the inner layer and an outer layer provided on an outer peripheral surface of the fuel-permeation-resistant layer, the inner layer being formed by the following (A), the fuel-permeation-resistant layer being formed by the following (B), and the outer layer being formed by the following (C);

(A) a polyester resin softened by an alloy of elastomer components or copolymerization;

(B) at least one polyester resin of polybutylene naphthalate (PBN) and polybutylene terephthalate (PBT);

(C) a polymer having flexural modulus of 350 to 650 MPa obtained by blending at least one selected from the group consisting of polymer particles each having a core-shell structure, ethylene acrylic elastomer (AEM) and a styrene-isobutylene block copolymer into polybutylene terephthalate (PBT).

2. A fuel hose as set forth in claim 1, further comprising a layer formed by using the above-mentioned (A) provided between the fuel-permeation-resistant layer and the outer layer.

4. A fuel hose as set forth in claim 1, wherein the polymer particles each having a core-shell structure of the above-mentioned (C) have a structure that a core comprising acrylic elastomer (ACM) is covered with a shell layer comprising acrylic resin having a polar functional group.

5. A fuel hose as set forth in claim 2, wherein the polymer particles each having a core-shell structure of the above-mentioned (C) have a structure that a core comprising acrylic elastomer (ACM) is covered with a shell layer comprising acrylic resin having a polar functional group.

3. A fuel hose comprising an inner layer which contacts a fuel being transported and an outer layer provided on an outer peripheral surface of the inner layer, the inner layer being formed by the following (A) and the outer layer being formed by the following (C):

(A) a polyester resin softened by an alloy of elastomer components or copolymerization;

(C) a polymer having flexural modulus of 350 to 650 MPa obtained by blending at least one selected from the group consisting of polymer particles each having a core-shell structure, ethylene acrylic elastomer (AEM) and a styrene-isobutylene block copolymer into polybutylene terephthalate (PBT).

6. A fuel hose as set forth in claim 3, wherein the polymer particles each having a core-shell structure of the above-mentioned (C) have a structure that a core comprising acrylic elastomer (ACM) is covered with a shell layer comprising acrylic resin having a polar functional group.