Fuel system part

Details Fuel system part Fuel system part

2002-01-31

2004-05-25

Short, Patricia A. (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S068000, C525S150000, C525S189000

Reexamination Certificate

active

06740707

ABSTRACT:

CROSS-REFERENCES TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2001-023454, filed Jan. 31, 2001, entitled “FUEL SYSTEM PART”. The contents of this application are incorporated herein by reference in their entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fuel system part consisting of a resin material. More particular, the present invention relates to a fuel system part having excellent fuel permeation resistance and having excellent shock impact resistance and heat resistance.
2. Discussion of the Background
Conventionally, as automobile fuel system parts such as fuel tanks and valves, there has been applied an HDPE (high density polyethylene) which is excellent in shock impact resistance and chemical resistance and can reduce cost. However, the HDPE has large intermolecular spaces and low cohesive power. Thus, there is a problem that fuel permeation properties are great. Recently, as an environmental restriction, evaporation restriction is provided, and it is required to suppress evaporation of hydrocarbon. Thus, there is a growing need for a material for fuel system parts with excellent fuel permeation resistance. However, in the conventional HDPS, it is difficult to cope with the foregoing problem for the above reasons.
Recently, although a material such as polyamide
12
or polyamide
6
is considered as a material having excellent fuel permeation resistance, such material is inferior to the HDPE in shock impact resistance, and is inferior to an alcohol-containing fuel in fuel permeation resistance.
As materials with permeation resistance to the alcohol-containing fuels, there are employed a liquid crystal polymer, polyketone, PBT, PPS and the like. However, there is a disadvantage that these materials are inferior in toughness or shock impact resistance.
The inventor found out an alloy material of a polyphenylene sulfide resin (hereinafter, referred to as a PPS resin) and an olefin-based resin as a material with very excellent fuel permeation resistance and excellent shock impact resistance and heat resistance that are reverse characteristics.
SUMMARY OF THE INVENTION
An object of the present invention is to provide fuel system part with excellent fuel permeation resistance and excellent shock impact resistance and heat resistance.
According to one aspect of the present invention, there is provided a fuel system part consisting of a resin composition, wherein the resin composition comprises (a) a polyphenylene sulfide resin and (b) an olefin based resin, wherein an amount of the (a) polyphenylene sulfide resin and the (b) olefin based resin is 80 weight % or more of the entire resin composition and the content of the (b) olefin based resin is 10 to 100 parts by weight relevant to 100 parts by weight of the (a) polyphenylene sulfide resin, and wherein the resin composition has a fuel permeability coefficient (Fuel C/ethanol=90/10) of 3.3×10
−16
mol·m/m
2
·s·Pa or less at 40° C.


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