Multi-layer plastic fuel tank
AssigneesTonen Chemical Corporation, Toyota Jidosha Kabushiki Kaisha
InventorsYutaka Takado, Toshikazu Nakasato, Tetsuro Nogata, Eiji Tezuka, Toshio Yokoi
Life of this patent
Estimating the term…
Abstract
A multi-layer plastic fuel tank is constituted by at least one high-density polyethylene layer, at least one polyamide layer, and at least one modified high-density polyethylene layer made of high-density polyethylene modified with an unsaturated carboxylic acid or its derivatives, which is interposed between each high-density polyethylene layer and each polyamide layer for bonding them, the polyamide layer being made of a polyamide copolymer comprising 90-60 weight % of polyamide 6 and 10-40 weight % of polyamide 66.
Claims5
A heat and impact resistant blow-molded, multi-layer plastic fuel tank consisting of an inner and an outer high-density polyethylene layer, a central polyamide gas barrier layer and a modified high-density polyethylene layer between the central polyamide layer and the inner and outer high-density polyethylene layers, wherein
- (a) said high-density polyethylene layers having a density of 0.935 g/cm.sup.3 or more and a total thickness of 1.5-5.2 mm;
- (b) said polyamide layer being made of a polyamide copolymer comprising 90-60 weight % of polyamide 6 and 10-40 weight % of polyamide 66 and having a thickness of 20-500 .mu.m;
- and
- (c) said modified high-density polyethylene layer being made of high-density polyethylene modified with an unsaturated carboxylic acid or a derivative thereof and having a total thickness of 20-500 .mu.m;
- the ratio of the total thicknesses of said layers (a), (b) and (c) being 99-60:0.5-20:0.5-20.
A heat and impact resistant, blow-molded, multi-layer, plastic fuel tank comprising:
- (a) at least one high-density polyethylene layer having a total thickness of 1.5-5 mm;
- (b) at least one polyamide gas barrier layer made of a blend of (i) a polyamide copolymer comprising 90-60 weight % of polyamide 6 and 10-40 weight % of polyamide 66 and (ii) a an olefinic elastomer modified with an unsaturated carboxylic acid or a derivative thereof, and having a total thickness of 20-500 .mu.m;
- and
- (c) at least one modified high-density polyethylene layer made of high-density polyethylene modified with an unsaturated carboxylic acid or a derivative thereof having a total thickness of 20-500 .mu.m interposed between each said high-density polyethylene layer and each said polyamide layer for bonding said high-density polyethylene layer and said polyamide layer;
- wherein the ratio of the total thicknesses of (a):(b):(c) is 99-60:0.5-20:0.5-20.
Dependencies are inferred from the claim text.