US4729926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging material for long-term storage of shelf stable food products and method of making same
Assignee: Cryovac LLC
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Filing: 1986-12-04
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Granted: 1988-03-08
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Expires: 2006-12-04
Abstract
Abstract A thermoplastic laminate suitable for long-term storage of shelf stable food products includes a first substrate comprising a layer of ethylene vinyl alcohol copolymer and a layer of a polyamide; and a second substrate bonded to the first substrate and comprising a vinylidene chloride copolymer. Polyamide may be included in a separate and distinct third substrate disposed between the first and second substrates.
Inventors
- 👤 Randal M. Koteles
- 👤 John G. Bradfute
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:14
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/185; B29C48/09; B29C48/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31728; Y10T428/31732; Y10T428/31739; Y10T428/31743; Y10T428/3175; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
55 words
A thermoplastic laminate comprising: (a) a first substrate comprising a layer of ethylene vinyl alcohol copolymer, a layer of a polyamide, and an outer layer of linear low density polyethylene; and (b) a second substrate bonded to the first substrate and comprising a vinylidene chloride copolymer, and an outer layer of linear low density polyethylene.
Claim 2
Dependent Claim
55 words
A thermoplastic laminate comprising: (a) a first substrate comprising a layer of ethylene vinyl alcohol copolymer, a layer of a polyamide, and an outer layer of linear low density polyethylene; and (b) a second substrate bonded to the first substrate and comprising a vinylidene chloride copolymer, and an outer layer of linear low density polyethylene.
Claim 3
Dependent Claim
50 words
A laminate according to claim 1 wherein the first substrate comprises: (a) a first layer comprising a polyamide; (b) a second layer comprising an ethylene vinyl alcohol copolymer; (c) a third layer comprising a polyamide; (d) a tie layer; and (e) a sealant layer comprising a linear low density polyethylene.
Claim 4
Dependent Claim
29 words
A laminate according to claim 2 wherein the first substrate further comprises an additional layer disposed between the tie layer and sealant layer and comprising a low density polyethylene.
Claim 5
Dependent Claim
37 words
A laminate according to claim 2 wherein the first substrate further comprises an additional layer comprising a polyamide, said additional layer disposed on the surface of the first layer, and in bonding relationship to the second substrate.
Claim 6
Dependent Claim
14 words
A laminate according to claim 1 wherein the vinylidene chloride copolymer is a coating.
Claim 7
Dependent Claim
54 words
A laminate according to claim 1 wherein the second substrate comprises: (a) a sealant layer comprising a linear low density polyethylene; (b) intermediate layers each comprising an ethylene-unsaturated ester copolymer; (c) a core layer of vinylidene chloride copolymer disposed between the intermediate layers; and (d) an inner bonding layer comprising an ethylene-unsaturated ester copolymer.
Claim 8
Dependent Claim
22 words
A laminate according to claim 1 wherein the second substrate is bonded to the first substrate by means of a lamination adhesive.
Claim 9
Dependent Claim
55 words
A thermoplastic laminate comprising: (a) a first substrate comprising a layer of an ethylene vinyl alcohol copolymer and a layer of a polyamide; (b) a second substrate comprising a vinylidene chloride copolymer; and (c) a third substrate disposed between and bonded by a lamination adhesive to the first and second substrates and comprising a polyamide.
Claim 10
Dependent Claim
55 words
A thermoplastic laminate comprising: (a) a first substrate comprising a layer of an ethylene vinyl alcohol copolymer and a layer of a polyamide; (b) a second substrate comprising a vinylidene chloride copolymer; and (c) a third substrate disposed between and bonded by a lamination adhesive to the first and second substrates and comprising a polyamide.
Claim 11
Dependent Claim
50 words
A laminate according to claim 8 wherein the first substrate comprises: (a) a first layer comprising a polyamide; (b) a second layer comprising an ethylene vinyl alcohol copolymer; (c) a third layer comprising a polyamide; (d) a tie layer; and (e) a sealant layer comprising a linear low density polyethylene.
Claim 12
Dependent Claim
29 words
A laminate according to claim 9 wherein the first substrate further comprises an additional layer disposed between the tie layer and sealant layer and comprising a low density polyethylene.
Claim 13
Dependent Claim
31 words
A laminate according to claim 8 wherein the second substrate comprises: (a) a sealant layer comprising a linear low density polyethylene, and (b) a bonding layer comprising a vinylidene chloride copolymer.
Claim 14
Dependent Claim
18 words
A laminate according to claim 11 wherein the vinylidene chloride copolymer is a coating on the sealant layer.
Claim 15
Dependent Claim
54 words
A laminate according to claim 8 wherein the second substrate comprises: (a) a sealant layer comprising a linear low density polyethylene; (b) intermediate layers each comprising an ethylene-unsaturated ester copolymer; (c) a core layer of vinylidene chloride copolymer disposed between the intermediate layers; and (d) an inner bonding layer comprising an ethylene-unsaturated ester copolymer.
Claim 16
Dependent Claim
16 words
A laminate according to claim 8 wherein the polyamide of the third substrate is biaxially oriented.
Claim 17
Dependent Claim
63 words
A process for making a thermoplastic laminate comprising: (a) coextruding a first substrate comprising a layer of ethylene vinyl alcohol, a layer of a polyamide, and an outer layer of linear low density polyethylene; (b) extruding a second substrate comprising a vinylidene chloride copolymer and an outer layer of linear low density polyethylene; and (c) adhering the first substrate to the second substrate.
Claim 18
Dependent Claim
63 words
A process for making a thermoplastic laminate comprising: (a) coextruding a first substrate comprising a layer of ethylene vinyl alcohol, a layer of a polyamide, and an outer layer of linear low density polyethylene; (b) extruding a second substrate comprising a vinylidene chloride copolymer and an outer layer of linear low density polyethylene; and (c) adhering the first substrate to the second substrate.
Claim 19
Dependent Claim
67 words
A process for making a thermoplastic laminate comprising: (a) extruding a first substrate comprising a layer of an ethylene vinyl alcohol copolymer and a layer of a polyamide; (b) extruding a second substrate comprising a vinylidene chloride copolymer; (c) extruding a third substrate comprising a polyamide; and (d) adhering the first and second substrates to opposite surfaces of the third substrate by means of a lamination adhesive.
Claim 20
Dependent Claim
67 words
A process for making a thermoplastic laminate comprising: (a) extruding a first substrate comprising a layer of an ethylene vinyl alcohol copolymer and a layer of a polyamide; (b) extruding a second substrate comprising a vinylidene chloride copolymer; (c) extruding a third substrate comprising a polyamide; and (d) adhering the first and second substrates to opposite surfaces of the third substrate by means of a lamination adhesive.
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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) | 1991-03-08 | 1991-09-07 | 1992-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-08 | 1995-09-07 | 1996-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-08 | 1999-09-07 | 2000-03-08 | $7700.00 | Window Closed / Lapsed |