Automotive fuel hose
View Patent ↗An automotive fuel hose is disclosed including an inner layer, an intermediate layer and an outer layer provided in this order on an outer peripheral surface of an innermost layer of a fluororesin. The inner layer and the outer layer each include of an amine-modified polyamide resin, where the intermediate layer is a resin composition including the following components: (A) a polyphenylenesulfide resin as a major component; (B) an acid-modified polyolefin resin; (C) an unmodified polyolefin resin; and (D) an epoxy resin. The proportion of the component (B) in the resin composition is 4 to 12 wt % and the proportion of the component (C) in the resin composition is 4 to 12 wt %, wherein the proportion of the component (D) in the resin composition is 1.5 to 5 wt %.
1. An automotive fuel hose, comprising:
a tubular innermost layer of a fluororesin;
an inner layer provided on an outer peripheral surface of the innermost layer;
an intermediate layer provided on the inner layer; and
an outer layer provided on the intermediate layer,
wherein the inner layer and the outer layer are each composed of an amine-modified polyamide resin,
wherein the intermediate layer is composed of a resin composition including:
(A) a polyphenylenesulfide resin;
(B) 4 to 12 wt % of a modified polyolefin resin;
(C) 4 to 12 wt % of an unmodified polyolefin resin; and
(D) 1.5 to 5 wt % of an epoxy resin,
wherein the modified polyolefin resin (B) and the unmodified polyolefin resin (C) are present in a total proportion of 12 to 24 wt % in a weight ratio of (B)/(C)=3/1 to 1/3 in the resin composition, and
wherein the intermediate layer is bonded to the inner layer and the outer layer through a chemical reaction.
2. The automotive fuel hose as set forth in claim 1 , wherein the modified polyolefin resin (B) is at least one of an ethylene-α-olefin copolymer modified with maleic anhydride and an ethylene-α-olefin copolymer modified with maleic acid.
3. The automotive fuel hose as set forth in claim 1 , wherein the unmodified polyolefin resin (C) is an ethylene-α-olefin copolymer.
4. The automotive fuel hose as set forth in claim 1 , wherein the epoxy resin (D) is an o-cresol novolak epoxy resin.
5. The automotive fuel hose as set forth in claim 1 , wherein the fluororesin for the innermost layer is a fluororesin having a functional group.
6. The automotive fuel hose as set forth in claim 1 , wherein the inner layer, the intermediate layer and the outer layer are formed by coextrusion.