Fuel filler pipe

Patent metadata

Field	Value
Publication number	US-2022379578-A1
Application number	US-202117333234-A
Country	US
Kind code	A1
Filing date	May 28, 2021
Priority date	May 28, 2021
Publication date	Dec 1, 2022
Grant date	—

Abstract

Provided is a fuel filler pipe including: an inner layer that contains a fluorine-containing copolymer having a carbonyl group-containing group and having a melting point of 250° C. or lower; an intermediate layer that contains a non-fluorine copolymer having a unit based on ethylene and a unit based on vinyl alcohol; and an outer layer that contains a polyolefin, wherein the inner layer, the intermediate layer, and the outer layer are directly laminated in that order, and the outer layer is a layer that contains a polyolefin having a unit based on an acid anhydride or is a layer in which a layer that contains a polyolefin having a unit based on an acid anhydride and a layer that contains a polyolefin having no unit based on an acid anhydride are directly laminated.

First claim

1 . A fuel filler pipe comprising:
an inner layer that contains a fluorine-containing copolymer having a unit based on tetrafluoroethylene and a unit based on ethylene, having a carbonyl group-containing group, and having a melting point of 250° C. or lower; an intermediate layer that contains a non-fluorine copolymer having a unit based on ethylene and a unit based on vinyl alcohol; and an outer layer that contains a polyolefin, wherein the inner layer, the intermediate layer, and the outer layer are directly laminated in that order, and the outer layer is a layer that contains a polyolefin having a unit based on an acid anhydride or is a layer in which a layer that contains a polyolefin having a unit based on an acid anhydride and a layer that contains a polyolefin having no unit based on an acid anhydride are directly laminated.

2 . The fuel filler pipe according to claim 1 ,
wherein the carbonyl group-containing group contained in the fluorine-containing copolymer is a carbonyl group-containing group derived from a unit based on a monomer having a carbonyl group-containing group.

3 . The fuel filler pipe according to claim 1 ,
wherein the carbonyl group-containing group contained in the fluorine-containing copolymer is an acid anhydride group derived from a unit based on a monomer having an acid anhydride group.

4 . The fuel filler pipe according to claim 1 ,
wherein the fluorine-containing copolymer is contained in an amount of 80% to 100% by mass with respect to a total mass of the inner layer, the non-fluorine copolymer is contained in an amount of 80% to 100% by mass with respect to a total mass of the intermediate layer, and the polyolefin is contained in an amount of 80% to 100% by mass with respect to a total mass of the outer layer.

5 . The fuel filler pipe according to claim 1 ,
wherein the inner layer contains a conductive filler.

6 . The fuel filler pipe according to claim 5 ,
wherein a surface resistivity of the inner layer is 10 3 Ω/sq. or lower.

7 . The fuel filler pipe according to claim 1 ,
wherein a surface resistivity of the inner layer is 10 5 Ω/sq. or lower.

8 . The fuel filler pipe according to claim 1 ,
wherein, in the intermediate layer, the non-fluorine copolymer contains 25 to 50 mol % of a unit based on ethylene with respect to a total unit forming the non-fluorine copolymer.

9 . The fuel filler pipe according to claim 1 ,
wherein, in the intermediate layer, the unit based on vinyl alcohol forming the non-fluorine copolymer is obtained by saponifying 99% or more of a unit based on vinyl acetate.

10 . The fuel filler pipe according to claim 1 ,
wherein a total thickness of the inner layer, the intermediate layer, and the outer layer is 1.0 to 20.0 mm.

11 . The fuel filler pipe according to claim 10 ,
wherein a thickness of the inner layer is 10% to 30% of a thickness of the outer layer.

12 . The fuel filler pipe according to claim 11 ,
wherein a thickness of the intermediate layer is 10% to 30% of the thickness of the outer layer.

13 . The fuel filler pipe according to claim 1 ,
wherein an ester bond is present at both a first interface between the inner layer and the intermediate layer and a second interface between the intermediate layer and the outer layer.

14 . The fuel filler pipe according to claim 13 ,
wherein the ester bond is an ester bond formed from an acid anhydride group and a hydroxy group.

15 . The fuel filler pipe according to claim 1 ,
wherein a peel strength is 30 N/cm or greater at both a first interface between the inner layer and the intermediate layer and a second interface between the intermediate layer and the outer layer.

16 . The fuel filler pipe according to claim 1 ,
wherein a fuel permeability coefficient of the inner layer determined using CE10 at 60° C., which is a test fuel of isooctane:toluene:ethanol (volume ratio)=45:45:10 by a cup method below, is 6.0 g·mm/(m 2 ·24 hr) or less, (cup method) a test piece having a thickness of 100 m is prepared, and in accordance with the cup method specified in JIS Z 0208-1976, 4.6 g of a specified test fuel is placed in a cup having a permeation area of 11.33 cm 2 , an upper part of the cup is covered with the test piece, loss in mass after being kept at 60° C. for 10 days is recorded, and the fuel permeability coefficient of a polymer is determined using the following equation,
Fuel permeability coefficient=loss in mass (g)×thickness of test piece (mm)/(permeation area (m 2 )×number of permeation days).

17 . The fuel filler pipe according to claim 1 ,
wherein a surface resistivity of the inner layer after enclosing the CE10 and exposure at a temperature of 40° C. for 1000 hours is 10 5 Ω/sq. or lower.

18 . The fuel filler pipe according to claim 1 ,
wherein a peel strength is 40 N/cm or greater at both a first interface between the inner layer and the intermediate layer and a second interface between the intermediate layer and the outer layer.

19 . The fuel filler pipe according to claim 1 ,
wherein, in the inner layer, a retention ratio of tensile breaking strength to initial tensile breaking strength after exposure to an atmospheric temperature of 200° C. for 1000 hours is 75% or higher.

20 . The fuel filler pipe according to claim 1 ,
wherein, in the inner layer, a retention ratio of tensile breaking elongation to initial tensile breaking elongation after exposure to an atmospheric temperature of 200° C. for 1000 hours is 75% or higher.

21 . The fuel filler pipe according to claim 1 ,
wherein, in the inner layer, a retention ratio of tensile breaking strength to initial tensile breaking strength after exposure to an atmospheric temperature of 220° C. for 1000 hours is 70% or higher.

22 . The fuel filler pipe according to claim 1 ,
wherein, in the inner layer, a retention ratio of tensile breaking elongation to initial tensile breaking elongation after exposure to an atmospheric temperature of 220° C. for 1000 hours is 65% or higher.

Assignees

• Agc Inc
• Toyoda Gosei Kk

Inventors

• Nishi Eiichi
• Sprick Katherine
• Grzybowski Thomas
• Grypinich Pierre
• PRIESTLEY-DUNN Jacquelyn
• MELVILLE Marc
• SWARTHOUT Ronnie

Classifications

• B32B2307/7265

  Non-permeable · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B27/20

  using fillers, pigments, thixotroping agents · CPC title

• B32B2250/246

  All polymers belonging to those covered by groups B32B27/32 and B32B27/30 · CPC title

• B32B1/08 Primary

  Tubular products · CPC title