US4239826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer barrier film
Assignee: Rexam Beverage Can Co
•
Filing: 1978-12-28
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Granted: 1980-12-16
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Expires: 1998-12-28
Abstract
Abstract A delamination resistant multi-layer film comprises a core layer of vinyl alcohol polymers or copolymers such as polyvinyl alcohol or ethylene vinyl alcohol. Adhered to the core layer are one or more layers of a partially hydrolyzed vinyl acetate polymer or copolymer having functional groups in the polymer such that strong adhesion to the core layer is obtained. The core layer provides an excellent oxygen barrier, while the adjacent layers protect the core layer from degradation by exposure to water vapor. Additional layers of various polymer materials may be provided over the layers of partially hydrolyzed vinyl acetate. The film can be prepared by coextrusion techniques.
Inventors
- 👤 II Jack E. Knott
- 👤 James C. Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:10
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/306; B32B27/06; B32B27/08; B32B27/32; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
58 words
A delamination resistant multi-layer structure comprising a barrier layer of a substantially pure polymer or copolymer of vinyl alcohol having less than about 1.5 mole percent remaining vinyl acetate groups and an adjacent adherent layer consisting essentially of a partially hydrolyzed vinyl acetate polymer or copolymer which has at least about 5 mole percent remaining vinyl acetate groups.
Claim 2
Dependent Claim
58 words
A delamination resistant multi-layer structure comprising a barrier layer of a substantially pure polymer or copolymer of vinyl alcohol having less than about 1.5 mole percent remaining vinyl acetate groups and an adjacent adherent layer consisting essentially of a partially hydrolyzed vinyl acetate polymer or copolymer which has at least about 5 mole percent remaining vinyl acetate groups.
Claim 3
Dependent Claim
24 words
The multi-layer structure of claim 1 wherein the barrier layer is adhered between adherent layers of the partially hydrolyzed vinyl acetate polymer or copolymer.
Claim 4
Dependent Claim
19 words
The multi-layer structure of claim 1 wherein a further layer of a polymer is adhered to the adherent layer.
Claim 5
Dependent Claim
22 words
The multi-layer structure of claim 2 wherein a further layer of polymer is adhered to at least one of the adherent layers.
Claim 6
Dependent Claim
15 words
The multi-layer structure of claim 1 wherein the barrier layer is ethylene vinyl alcohol copolymer.
Claim 7
Dependent Claim
17 words
The multi-layer structure of claim 1 wherein the adherent layer consists essentially of partially hydrolyzed polyvinyl acetate.
Claim 8
Dependent Claim
19 words
The multi-layer structure of claim 1 wherein the adherent layer consists essentially of partially hydrolyzed ethylene vinyl acetate copolymer.
Claim 9
Dependent Claim
13 words
The multi-layer structure of claim 3 wherein the further layer is a polyolefin.
Claim 10
Dependent Claim
12 words
The multi-layer structure of claim 3 wherein the further layer is nylon.
Claim 11
Dependent Claim
15 words
The multi-layer structure of claim 3 wherein the further layer is ethylene vinyl acetate copolymer.
Claim 12
Dependent Claim
13 words
The multi-layer structure of claim 3 wherein the further layer is an ionomer.
Claim 13
Dependent Claim
56 words
A delamination resistant coextruded multi-layer structure comprising a barrier layer of substantially pure ethylene vinyl alcohol copolymer having less than about 1.5 mole percent remaining vinyl acetate groups adhered between adjacent adherent layers consisting essentially of a partially hydrolized vinyl acetate polymer or copolymer which has at least about 5 mole percent remaining vinyl acetate groups.
Claim 14
Dependent Claim
56 words
A delamination resistant coextruded multi-layer structure comprising a barrier layer of substantially pure ethylene vinyl alcohol copolymer having less than about 1.5 mole percent remaining vinyl acetate groups adhered between adjacent adherent layers consisting essentially of a partially hydrolized vinyl acetate polymer or copolymer which has at least about 5 mole percent remaining vinyl acetate groups.
Claim 15
Dependent Claim
17 words
The multi-layer structure of claim 12 wherein the adherent layers consist essentially of partially hydrolyzed polyvinyl acetate.
Claim 16
Dependent Claim
19 words
The multi-layer structure of claim 12 wherein the adherent layers consist essentially of partially hydrolyzed ethylene vinyl acetate copolymer.
Claim 17
Dependent Claim
49 words
The multi-layer structure of claim 13 further having a layer over at least one of the adherent layers comprising a polymer selected from the group consisting of polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, blends of two or more of the foregoing polymers, nylon, and ionomers.
Claim 18
Dependent Claim
49 words
The multi-layer structure of claim 14 further having a layer over at least one of the adherent layers comprising a polymer selected from the group consisting of polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, blends of two or more of the foregoing polymers, nylon, and ionomers.
Claim 19
Dependent Claim
121 words
A delamination resistant coextruded multi-layer structure comprising (a) a core layer of a substantially pure ethylene vinyl alcohol copolymer having less than about 1.5 mole percent remaining vinyl acetate groups; (b) an adherent layer adhered on each side of the core layer, the adherent layer consisting essentially of partially hydrolyzed polyvinyl acetate or partially hydrolyzed ethylene-vinyl acetate copolymer, to result in a polymer having at least about 5 mole percent remaining vinyl acetate groups; (c) an outer polymer layer over at least one of the adherent layers, the outer layers being independently selected from the group which consists of polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, blends of two or more of the foregoing polymers, nylon, and ionomers.
Claim 20
Dependent Claim
121 words
A delamination resistant coextruded multi-layer structure comprising (a) a core layer of a substantially pure ethylene vinyl alcohol copolymer having less than about 1.5 mole percent remaining vinyl acetate groups; (b) an adherent layer adhered on each side of the core layer, the adherent layer consisting essentially of partially hydrolyzed polyvinyl acetate or partially hydrolyzed ethylene-vinyl acetate copolymer, to result in a polymer having at least about 5 mole percent remaining vinyl acetate groups; (c) an outer polymer layer over at least one of the adherent layers, the outer layers being independently selected from the group which consists of polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, blends of two or more of the foregoing polymers, nylon, and ionomers.
Claim 21
Dependent Claim
43 words
A delamination resistant coextruded multi-layer structure comprising a barrier layer of substantially pure ethylene vinyl alcohol copolymer and an adjacent adherent layer which consists essentially of partially hydrolyzed ethylene vinyl acetate copolymer and having at least about 5 mole percent remaining vinyl acetate.
Claim 22
Dependent Claim
43 words
A delamination resistant coextruded multi-layer structure comprising a barrier layer of substantially pure ethylene vinyl alcohol copolymer and an adjacent adherent layer which consists essentially of partially hydrolyzed ethylene vinyl acetate copolymer and having at least about 5 mole percent remaining vinyl acetate.
Claim 23
Dependent Claim
13 words
The structure of claim 18 having about 11 mole percent remaining vinyl acetate.
Claim 24
Dependent Claim
38 words
A delamination resistant coextruded multi-layer structure comprising a barrier layer of substantially pure ethylene vinyl alcohol copolymer and an adjacent adherent layer of partially hydrolyzed polyvinyl acetate and having at least about 5 mole percent remaining vinyl acetate.
Claim 25
Dependent Claim
38 words
A delamination resistant coextruded multi-layer structure comprising a barrier layer of substantially pure ethylene vinyl alcohol copolymer and an adjacent adherent layer of partially hydrolyzed polyvinyl acetate and having at least about 5 mole percent remaining vinyl acetate.
Claim 26
Dependent Claim
13 words
The structure of claim 20 having about 13 mole percent remaining vinyl acetate.
Claim 27
Dependent Claim
9 words
A container formed from the structure of claim 1.
Claim 28
Dependent Claim
9 words
A container formed from the structure of claim 12.
Claim 29
Dependent Claim
9 words
A container formed from the structure of claim 17.
Claim 30
Dependent Claim
9 words
A container formed from the structure of claim 19.
Claim 31
Dependent Claim
9 words
A container formed from the structure of claim 21.
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |