US5384172A
Expired / Lapsed
US
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Multi-layer plastic fuel tank
Assignee: Tonen Chemical Corp
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Filing: 1993-08-23
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Granted: 1995-01-24
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Expires: 2013-08-23
Abstract
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.
Inventors
- 👤 Yutaka Takado
- 👤 Toshikazu Nakasato
- 👤 Tetsuro Nogata
- 👤 Eiji Tezuka
- 👤 Toshio Yokoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:04
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/36; B29C48/395; B29C48/50; B29C48/505; B29C48/565; B29C48/67; B29C49/00; B29C49/22; B32B1/00; B32B27/32; B32B27/34; B29C48/09; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0633; B29K2077/00; B29K2096/00; B29K2096/02; B29K2105/00; B29K2105/26; B29L; B29L2031/00; B29L2031/712; B29L2031/7172; B32B2307/00; B32B2307/70; B32B2307/718; B32B2309/00; B32B2309/02; B32B2309/08; B32B2309/10; B32B2309/105; B32B2323/00; B32B2323/04; B32B2323/043; B32B2377/00; B32B2439/00; B32B2439/40; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
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 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 μm; 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 μm; the ratio of the total thicknesses of said layers (a), (b) and (c) being 99-60:0.5-20:0.5-20.
Claim 2
Dependent Claim
143 words
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 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 μm; 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 μm; the ratio of the total thicknesses of said layers (a), (b) and (c) being 99-60:0.5-20:0.5-20.
Claim 3
Dependent Claim
46 words
The blow-molded, multi-layer plastic fuel tank according to claim 1, wherein the high-density polyethylene layers contain 100 parts by weight of virgin high-density polyethylene and 20-200 parts by weight of regenerated high-density polyethylene obtained from a blow-molded, multi-layer plastic fuel tank as defined in claim 1.
Claim 4
Dependent Claim
22 words
The blow-molded, multi-layer plastic fuel tank according to claim 1, wherein the high-density polyethylene layers have a total thickness of 1.5-5.0 mm.
Claim 5
Dependent Claim
143 words
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 μm; 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 μm 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.
Claim 6
Dependent Claim
143 words
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 μm; 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 μm 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.
Claim 7
Dependent Claim
42 words
The blow-molded, multi-layer, plastic fuel tank according to claim 4, consisting of an inner and an outer high-density polyethylene layer, a central polyamide layer, and a modified high-density polyethylene layer between the central polyamide layer and the inner and outer polyethylene layers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-23 | 2006-07-25 | 2007-01-24 | $7700.00 | Window Closed / Lapsed |