Patent US4755419A successfully refreshed from Google Patents.
US4755419A
Expired / Lapsed
US
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Oxygen barrier oriented shrink film
Assignee: Cryovac LLC
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Filing: 1986-03-21
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Granted: 1988-07-05
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Expires: 2006-03-21
Abstract
Abstract A coextruded multiple layer oriented film comprises a core layer of ethylene vinyl alcohol copolymer, and two intermediate layers each comprising a polyamide. Two outer layers comprising polymeric materials or blends of polymeric materials such as (a) linear low and linear medium density polyethylene, and EVA, and (b) blends of polypropylene and ethylene propylene copolymer are adhered to the intermediate polyamide layers by means of modified polymeric adhesive materials. A multilayer film with a combination of oxygen barrier properties, toughness, shrinkability, and good optical properties is obtained.
Inventors
- 👤 Gautam P. Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:13
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; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
118 words
A biaxially oriented coextruded film having at least seven layers arranged symmetrically comprising: (a) a core layer comprising an ethylene vinyl alcohol copolymer; (b) two intermediate layers each comprising a polyamide; (c) two outer layers each comprising a blend of polymeric material taken from the group consisting of (i) a blend of a linear low density polyethylene, a linear medium density polyethylene, and an ethylene vinyl acetate copolymer, and (ii) a blend of an ethylene propylene copolymer and a polypropylene; (d) two layers, each comprising an adhesive polymeric material, which adhere each of said intermediate layers to a respective outer layer; and (e) said film having a total thickness of from about 0.5 mils to about 2 mils.
Claim 2
Dependent Claim
118 words
A biaxially oriented coextruded film having at least seven layers arranged symmetrically comprising: (a) a core layer comprising an ethylene vinyl alcohol copolymer; (b) two intermediate layers each comprising a polyamide; (c) two outer layers each comprising a blend of polymeric material taken from the group consisting of (i) a blend of a linear low density polyethylene, a linear medium density polyethylene, and an ethylene vinyl acetate copolymer, and (ii) a blend of an ethylene propylene copolymer and a polypropylene; (d) two layers, each comprising an adhesive polymeric material, which adhere each of said intermediate layers to a respective outer layer; and (e) said film having a total thickness of from about 0.5 mils to about 2 mils.
Claim 3
Dependent Claim
32 words
A biaxially oriented multilayer film according to claim 1 wherein said core layer comprises an ethylene vinyl alcohol copolymer with an ethylene content of from about 28% to about 49% by weight.
Claim 4
Dependent Claim
18 words
A biaxially oriented multilayer film according to claim 1 wherein said polyamide comprises a nylon 6/nylon 12 copolymer.
Claim 5
Dependent Claim
51 words
A biaxially oriented multilayer film according to claim 1 wherein the adhesive polymeric material comprises a linear low density polyethylene-based, acid or acid anhydride-modified polymeric material when the outer layer is blend (i), and a polypropylene-based, acid or acid anhydride - modified polymeric material when the outer layer is blend (ii).
Claim 6
Dependent Claim
71 words
A biaxially oriented multilayer film according to claim 1 wherein each of said outer layers comprises a blend of (1) from about 40%, by weight, to about 60%, by weight, of a linear low density polyethylene, (2) from about 20%, by weight, to about 30%, by weight, of a linear medium density polyethylene, and (3) from about 20%, by weight, to about 30%, by weight, of an ethylene vinyl acetate copolymer.
Claim 7
Dependent Claim
46 words
A biaxially oriented film according to claim 5 wherein said blend comprises (1) about 50%, by weight, of a linear low density polyethylene, (2) about 25%, by weight, of a linear medium density polyethylene, and (3) about 25%, by weight, of an ethylene vinyl acetate copolymer.
Claim 8
Dependent Claim
45 words
A biaxially oriented film according to claim 1 wherein each of said outer layers comprises a blend of (1) from about 85% to about 96%, by weight, of an ethylene propylene copolymer, and (2) from about 4% to about 15%, by weight, of a polypropylene.
Claim 9
Dependent Claim
32 words
A biaxially oriented multilayer film accoriding to claim 7 wherein said blend comprises (1) about 90%, by weight, of an ethylene propylene copolymer, and (2) about 10%, by weight, of a polypropylene.
Claim 10
Dependent Claim
25 words
A biaxially oriented multilayer film according to claim 1 wherein said film has a total thickness of from about 0.5 mils to about 1.5 mils.
Claim 11
Dependent Claim
20 words
A biaxially oriented multilayer film according to claim 9 wherein said film has a total thickness of about one mil.
Claim 12
Dependent Claim
66 words
An oriented coextruded film having at least seven layers arranged symmetrically comprising: (a) a core layer comprising an ethylene vinyl alcohol copolymer; (b) two intermediate layers each comprising a polyamide; (c) two outer layers each comprising a polymeric material or blend of polymeric materials; and (d) two layers, each comprising an adhesive polymeric material, which adhere each of said intermediate layers to a respective outer layer.
Claim 13
Dependent Claim
66 words
An oriented coextruded film having at least seven layers arranged symmetrically comprising: (a) a core layer comprising an ethylene vinyl alcohol copolymer; (b) two intermediate layers each comprising a polyamide; (c) two outer layers each comprising a polymeric material or blend of polymeric materials; and (d) two layers, each comprising an adhesive polymeric material, which adhere each of said intermediate layers to a respective outer layer.
Claim 14
Dependent Claim
30 words
An oriented film according to claim 11 wherein said core layer comprises an ethylene vinyl alcohol copolymer with an ethylene content of from about 28% to about 49% by weight.
Claim 15
Dependent Claim
16 words
An oriented film according to claim 11 wherein said polyamide comprises a nylon 6/nylon 12 copolymer.
Claim 16
Dependent Claim
57 words
An oriented film according to claim 11 wherein said two outer layers each comprise a blend of polymeric materials taken from the group consisting of (i) a blend of a linear low density polyethylene, a linear medium density polyethylene, and an ethylene vinyl acetate copolymer, and (ii) a blend of an ethylene propylene copolymer and a polypropylene.
Claim 17
Dependent Claim
53 words
An oriented film according to claim 11, wherein the adhesive polymeric material comprises a linear low density polyethylene-based, acid or acid anhydride-modified polymeric material when the outer layer is blend (i) of claim 4, and a polypropylene-based, acid or acid anhydride-modified polymeric material when the outer layer is blend (ii) of claim 4.
Claim 18
Dependent Claim
101 words
An oriented coextruded film having at least seven layers arranged symmetrically comprising: (a) a core layer comprising an ethylene vinyl alcohol copolymer; (b) two intermediate layers each comprising a polyamide; (c) two outer layers each comprising a blend of polymeric material taken from the group consisting of (i) a blend of a linear low density polyethylene, a linear medium density polyethylene, and an ethylene vinyl acetate copolymer, and (ii) a blend of an ethylene propylene copolymer and a polypropylene; and (d) two layers, each comprising an adhesive polymeric material, which adhere each of said intermediate layers to a respective outer layer.
Claim 19
Dependent Claim
101 words
An oriented coextruded film having at least seven layers arranged symmetrically comprising: (a) a core layer comprising an ethylene vinyl alcohol copolymer; (b) two intermediate layers each comprising a polyamide; (c) two outer layers each comprising a blend of polymeric material taken from the group consisting of (i) a blend of a linear low density polyethylene, a linear medium density polyethylene, and an ethylene vinyl acetate copolymer, and (ii) a blend of an ethylene propylene copolymer and a polypropylene; and (d) two layers, each comprising an adhesive polymeric material, which adhere each of said intermediate layers to a respective outer layer.
Claim 20
Dependent Claim
31 words
An oriented multilayer film according to claim 16 wherein aid core layer comprises an ethylene vinyl alcohol copolymer with an ethylene content of from about 28% to about 49% by weight.
Claim 21
Dependent Claim
17 words
An oriented multilayer film according to claim 16 wherein said polyamide comprises a nylon 6/nylon 12 copolymer.
Claim 22
Dependent Claim
47 words
An oriented film according to claim 16 wherein the adhesive polymeric material comprises a linear low density polyethylene-based, acid or acid anhydride-modified polymeric material when the outer layer is blend (i), and a polypropylene-based, acid or acid anhydride-modified polymeric material when the outer layer is blend (ii).
Claim 23
Dependent Claim
69 words
An oriented film according to claim 16 wherein each of said outer layers comprises a blend of (1) from about 40%, by weight, to about 60%, by weight, of a linear low density polyethylene, (2) from about 20%, by weight, to about 30%, by weight, of a linear medium density polyethylene, and (3) from about 20%, by weight, to about 30%, by weight, of an ethylene vinyl acetate copolymer.
Claim 24
Dependent Claim
45 words
An oriented film according to claim 20 wherein said blend comprises (1) about 50%, by weight, of a linear low density polyethylene, (2) about 25%, by weight, of a linear medium density polyethylene, and (3) about 25%, by weight, of an ethylene vinyl acetate copolymer.
Claim 25
Dependent Claim
44 words
An oriented film according to claim 16 wherein each of said outer layers comprises a blend of (1) from about 85% to about 96%, by weight, of an ethylene propylene copolymer, and (2) from about 4% to about 15%, by weight, of a polypropylene.
Claim 26
Dependent Claim
30 words
An oriented film according to claim 22 wherein said blend comprises (1) about 90%, by weight, of an ethylene propylene copolymer, and (2) about 10%, by weight, of a polypropylene.
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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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |