Patent US2977582A successfully refreshed from Google Patents.
US4800129A
Expired / Lapsed
US
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Multi-layer plastic container
Assignee: EIDP Inc
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Filing: 1987-03-26
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Granted: 1989-01-24
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Expires: 2007-03-26
Abstract
Abstract Thermoformed multi-layer structures comprising at least a first and a second layer, the first layer comprising a blend of amorphous polyamides having a Tg greater than about 120° C. and one or more semicrystalline aliphatic polyamide and the second layer comprising a structural thermoplastic resin.
Inventors
- 👤 Gedeon I. Deak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:39
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/14; B29C51/002; B29K; B29K2077/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31736; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31786
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A thermoformed multi-layer structure comprising at least a first and second layer, said first layer comprising a blend of 70-85% of an amorphous polyamide having a Tg greater than about 120° C. which is a hexamethylenediamine iso/terephthalamide with a ratio of iso- to tere- phthalamide in the range of about 60/40 to 100/0, with 15-30% of one or more semicrystalline aliphatic polyamides and said second layer comprising one or more structural thermoplastic resins.
Claim 2
Dependent Claim
73 words
A thermoformed multi-layer structure comprising at least a first and second layer, said first layer comprising a blend of 70-85% of an amorphous polyamide having a Tg greater than about 120° C. which is a hexamethylenediamine iso/terephthalamide with a ratio of iso- to tere- phthalamide in the range of about 60/40 to 100/0, with 15-30% of one or more semicrystalline aliphatic polyamides and said second layer comprising one or more structural thermoplastic resins.
Claim 3
Dependent Claim
23 words
A thermoformed multi-layer structure of claim 1 where the blend in said first layer comprises 70% amorphous polyamide and 30% semicrystalline aliphatic polyamide.
Claim 4
Dependent Claim
21 words
A thermoformed multi-layer structure of claim 1 where said structural thermoplastic resin has a Tg of less than about 110° C.
Claim 5
Dependent Claim
46 words
A thermoformed multi-layer structure of claim 1 where said structural thermoplastic resin is selected from polyethylene terephthalate, polystyrene, polyvinyl chloride, linear and branched polyethylenes, co- and terpolymers of ethylene with vinyl acetate acrylic acid or methacrylic acid, and ionomers obtained by partially neutralizing such acid copolymers.
Claim 6
Dependent Claim
24 words
A thermoformed multilayer structure of claim 1 in which a layer of adhesive resin is interposed between said first layer and said second layer.
Claim 7
Dependent Claim
24 words
A thermoformed multi-layer structure of claim 1 where the ratio of nitrogen to carbon atoms in said semicrystalline aliphatic polyamide is at least 0.12.
Claim 8
Dependent Claim
24 words
A thermoformed multi-layer structure of claim 6 where said semicrystalline aliphatic polyamide is selected from nylon 6, nylon 66.6, nylon 6,10 and copolymers thereof.
Claim 9
Dependent Claim
23 words
A thermoformed multi-layer structure of claim 1 where said semicrystalline aliphatic polyamide is selected from nylon-6, nylon 66.6, nylon 6,10 and copolymers thereof.
Claim 10
Dependent Claim
44 words
A thermoformed multi-layer structure of claim 8 where said thermoplastic resin is selected from polyethylene terephthalate, polyvinyl chloride, linear and branched polyethylenes, co- and terpolymers of ethylene with vinyl acetate acrylic acid or methacrylic acid, and ionomers obtained by partially neutralizing such acid copolymers.
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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) | 1992-01-24 | 1992-07-25 | 1993-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-24 | 1996-07-25 | 1997-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-24 | 2000-07-25 | 2001-01-24 | $7700.00 | Window Closed / Lapsed |