Hose for fuel
AssigneesAsahi Glass Company, Limited, Ube Industries, Ltd.
InventorsEiichi Nishi, Masako Nagashima, Noriyuki Isobe, Tomoharu Nishioka, Yoshiro Iwata
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Abstract
A hose for fuel having a laminated structure comprising an inner layer (A) made of a ethylene/tetrafluoroethylene copolymer adhesive to a polyamide resin and an outer layer (B) made of a polyamide resin, is formed. Such a hose for fuel is excellent in interlaminar adhesive strength and also excellent in antistatic properties and fuel permeation-preventing properties, and particularly, the dependency of the interlaminar adhesive strength on the take-up speed during the co-extrusion molding, is small.
Claims14
A hose for fuel having a laminated structure, comprising:
- an inner layer made of an ethylene/tetrafluoroethylene copolymer and an outer layer made of a polyamide resin, wherein the inner layer adheres to the polyamide resin of the outer layer, and the outer layer is made of polyamide 12(a) that satisfies formula (1), or a mixture of polyamide 12(a) that satisfies formula (1) and polyamide 12(b) that satisfies formula (2), wherein polyamides 12(a) and 12(b) satisfy formula (3) and are polyamide resins showing an adhesive strength of at least 20 N/cm to the inner layer:
- [COOH]+[NH2]≧2×102/(17.8ηr(a)−19.1) (1)
- [COOH]+[NH2]<2×102/(17.8ηr(b)−19.1) (2)
- ηr(b)−ηr(a)≧0.3 (3)
- wherein [COOH] is the equivalent concentration of polyamide terminal carboxyl groups, [NH2] is the equivalent concentration of polyamide terminal amino groups, and ηr(a) and ηr(b) are the relative viscosities of polyamides 12(a) and 12(b), respectively.
Dependencies are inferred from the claim text.