Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1996-04-29
1999-04-06
Lipman, Bernard
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
525179, B29D 2200, B32B 700
Patent
active
058915389
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a thermoplastic resin composition and a laminate comprising the same. Particularly, it relates to a material constituting a single-layer substance or a laminate with a fluororesin and/or a polyamide resin in the shaping of a structural material, for example, a hose, a tube, a pipe, a seal, a gasket, a packing, a sheet, a film, a roller, a bottle, a tank and a container (e.g. a dish, a pan, etc.) having excellent chemical resistance to and impermeability of a gasoline, an alcohol, an acid, etc.
DESCRIPTION OF RELATED ART
For automobile fuel piping, various materials have been studied, and metallic materials such as iron are frequently used.
In view of prevention of air pollution, the lowering of weight for the improvement of cost of fuel and the addition of methanol, ethanol or MTBE (methyl tertiary butyl ether) into gasoline have been recently conducted. However, a conventional metal pipe or tube can not meet with difficulty of the lowering of weight because of a large specific gravity of metallic material, and has a problem such as corrosion by the addition of the additional compound such as methanol into gasoline. There has been requested a material for a fuel pipe or tube, which is lightweight, high corrosion resistance, high stability to the fuel and low fuel permeability.
By the way, a fluororesin is used in various fields because of its advantages such as heat resistance, oil resistance, chemical resistance, etc. Also, it has been intensively studied to use the fluororesin as an automobile fuel piping material by utilizing the low fuel permeability. Among the fluororesins, an ethylene/fluorine-containing olefin polymer seems to be optimum as the fluororesin for automobile parts, particularly the fuel pipe or tube because the ethylene/fluorine-containing olefin polymer has not only low fuel permeability, good flexibility, good low-temperature impact resistance and good heat resistance but also low specific gravity, low cost and good processability. However, it is expensive and has a large specific gravity in comparison with a hydrocarbon resin and, therefore, further cost down and lightening of weight are requested.
On the other hand, a polyamide resin has high strength, high toughness, low specific gravity and excellent processability. Particularly, a polyamide resin having a good flexibility (e.g. polyamide 11, 12, 610, etc.) is widely used for a hose, a tube, a pipe, etc., and is frequently used for automobile parts because of the excellent gasoline resistance. However, the pipe or tube made of the polyamide resin has the disadvantages that the fuel permeability of the gasoline containing the additional compound such as methanol is large while it has low specific gravity and no corrosion. There is also a problem that the deterioration of material, such as increase in fuel permeability, decrease in strength, etc. arises for a very small amount of water contained in the fuel and a deteriorated gasoline (sour gasoline) caused by an electronic fuel injection device.
Under these circumstances, an attempt of forming a single-layer or multi-layer tubing using a blend of the fluororesin and polyamide resin is made (Japanese Patent Kokai Publication No. 140588/1992). In the tube of the blend, however, the fuel permeability can be lowered only by about the volume fraction of the contained fluororesin.
On the other hand, the laminating of the fluororesin and the polyamide resin is an effective means for making the use of characteristics such as chemical resistance, low fuel permeability, etc. while controlling the amount of comparatively expensive fluororesin to a minimum essential amount. However, it is particularly difficult for a less adhesive fluororesin to obtain high interlaminar adhesion properties in the laminate. Accordingly, the above publication (i.e. Japanese Patent Kokai Publication No. 140588/1992) discloses the lamination of the blend of the fluororesin and polyamide resin with the polyamide resin, but it does not disclose lamination w
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Harada Takeshi
Shimizu Tetsuo
Yamamoto Yoshihisa
Yamato Takafumi
Baikin Industries, Ltd.
Lipman Bernard
Sarofim N.
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