Patent US4684573A successfully refreshed from Google Patents.
US4684573A
Expired / Lapsed
US
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High oxygen barrier composite film
Assignee: Cryovac LLC
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Filing: 1986-03-10
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Granted: 1987-08-04
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Expires: 2006-03-10
Abstract
Abstract High oxygen barrier characteristics over a wide range of humidity conditions are obtained by providing a combination of ethylene vinyl alcohol copolymer and vinylidene chloride copolymer in separate component films of a composite film.
Inventors
- 👤 Walter B. Mueller
- 👤 Henry G. Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:59
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; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
105 words
A thermoplastic, composite film comprising: (a) a first component film comprising an abuse-resistant layer; (b) a second component film adhered to one surface of the first component film; (c) a third component film adhered to a surface of the second component film opposite said first component film; and (d) a fourth component film adhered to a surface of the third component film opposite said second component film and comprising a heat sealable layer; wherein one of said second and third component films comprises an individually extruded vinylidene chloride copolymer, and the other of said second and third component films comprises an ethylene vinyl alcohol copolymer.
Claim 2
Dependent Claim
105 words
A thermoplastic, composite film comprising: (a) a first component film comprising an abuse-resistant layer; (b) a second component film adhered to one surface of the first component film; (c) a third component film adhered to a surface of the second component film opposite said first component film; and (d) a fourth component film adhered to a surface of the third component film opposite said second component film and comprising a heat sealable layer; wherein one of said second and third component films comprises an individually extruded vinylidene chloride copolymer, and the other of said second and third component films comprises an ethylene vinyl alcohol copolymer.
Claim 3
Dependent Claim
14 words
The film of claim 1 wherein said second component film is a coextruded film.
Claim 4
Dependent Claim
22 words
The film of claim 1 wherein said first, second, third and fourth component films are bonded together by means of corona bonding.
Claim 5
Dependent Claim
19 words
The film according to claim 1 wherein the first component film forms the outside component of the composite film.
Claim 6
Dependent Claim
18 words
The film according to claim 1 wherein the fourth component film forms the inside of the composite film.
Claim 7
Dependent Claim
65 words
The composite film according to claim 1 wherein the first and third surface layers of the first component film, the sixth or surface layer of the second component film, the first and sixth surface layers of the third component film, and the first and third surface layers of the fourth component film are ethylene vinyl acetate copolymer wherein the vinyl acetate content is about 3.5%.
Claim 8
Dependent Claim
289 words
A composite film comprising: a first component film comprising (a) a first or surface layer of ethylene vinyl acetate copolymer, (b) a second or core layer of linear low density polyethylene, and (c) a third or surface layer of ethylene vinyl acetate copolymer; a second component film adhered to a surface of the first component film and comprising (a) a first or surface layer of a blend of polyethylene and ethylene vinyl acetate copolymer, (b) a second or interior layer of a blend of polyethylene and ethylene vinyl acetate copolymer, (c) a third or interior adhesive layer, (d) a fourth or interior layer of ethylene vinyl alcohol copolymer, (e) a fifth or interior adhesive layer, and (f) a sixth or surface layer of ethylene vinyl acetate copolymer; a third component film adhered to a surface of the second component film opposite said first component film and comprising (a) a first or surface layer of ethylene vinyl acetate copolymer, (b) a second or interior layer of linear low density polyethylene, (c) a third or interior layer of ethylene vinyl acetate copolymer, (d) a fourth or barrier layer of vinylidene chloride copolymer, (e) a fifth or interior layer of ethylene vinyl acetate copolymer, and (f) a sixth or surface layer of ethylene vinyl acetate copolymer; and a fourth component film adhered to a surface of the third component film opposite said second component film and comprising (a) a first or surface layer of ethylene vinyl acetate copolymer, (b) a second or core layer of linear low density polyethylene, and (c) a third or surface layer of ethylene vinyl acetate copolymer; wherein the first, second, third, and fourth component films are individually extruded and then bonded together to produce the composite film.
Claim 9
Dependent Claim
289 words
A composite film comprising: a first component film comprising (a) a first or surface layer of ethylene vinyl acetate copolymer, (b) a second or core layer of linear low density polyethylene, and (c) a third or surface layer of ethylene vinyl acetate copolymer; a second component film adhered to a surface of the first component film and comprising (a) a first or surface layer of a blend of polyethylene and ethylene vinyl acetate copolymer, (b) a second or interior layer of a blend of polyethylene and ethylene vinyl acetate copolymer, (c) a third or interior adhesive layer, (d) a fourth or interior layer of ethylene vinyl alcohol copolymer, (e) a fifth or interior adhesive layer, and (f) a sixth or surface layer of ethylene vinyl acetate copolymer; a third component film adhered to a surface of the second component film opposite said first component film and comprising (a) a first or surface layer of ethylene vinyl acetate copolymer, (b) a second or interior layer of linear low density polyethylene, (c) a third or interior layer of ethylene vinyl acetate copolymer, (d) a fourth or barrier layer of vinylidene chloride copolymer, (e) a fifth or interior layer of ethylene vinyl acetate copolymer, and (f) a sixth or surface layer of ethylene vinyl acetate copolymer; and a fourth component film adhered to a surface of the third component film opposite said second component film and comprising (a) a first or surface layer of ethylene vinyl acetate copolymer, (b) a second or core layer of linear low density polyethylene, and (c) a third or surface layer of ethylene vinyl acetate copolymer; wherein the first, second, third, and fourth component films are individually extruded and then bonded together to produce the composite film.
Claim 10
Dependent Claim
74 words
The process for making a composite film comprising: (a) melt forming a first component film including an abuse-resistant layer; (b) melt forming a second component film including a layer of vinylidene chloride copolymer; (c) melt forming a third component film including a layer of ethylene vinyl alcohol copolymer, and (d) melt forming a fourth component film including a heat-sealable layer; and (e) joining together and bonding said first, second, third, and fourth component films.
Claim 11
Dependent Claim
74 words
The process for making a composite film comprising: (a) melt forming a first component film including an abuse-resistant layer; (b) melt forming a second component film including a layer of vinylidene chloride copolymer; (c) melt forming a third component film including a layer of ethylene vinyl alcohol copolymer, and (d) melt forming a fourth component film including a heat-sealable layer; and (e) joining together and bonding said first, second, third, and fourth component films.
Claim 12
Dependent Claim
238 words
The process for making a composite film comprising: (a) melt forming a first component film of a first or surface layer of ethylene vinyl acetate copolymer, a second or core layer of linear low density polyethylene, and a third or surface layer of ethylene vinyl acetate copolymer; (b) melt forming a second component film comprising a first or surface layer of a blend of polyethylene and ethylene vinyl acetate copolymer, a second or interior layer of a blend of polyethylene and ethylene vinyl acetate copolymer, a third or adhesive layer, a fourth or interior layer of ethylene vinyl alcohol copolymer, a fifth or interior adhesive layer, and a sixth or surface layer of ethylene vinyl acetate copolymer; (c) melt forming a third component film comprising a first or surface layer of ethylene vinyl acetate copolymer, a second or interior layer of linear low density polyethylene, a third or interior layer of ethylene vinyl acetate copolymer, a fourth or barrier layer of vinylidene chloride copolymer, a fifth or interior layer of ethylene vinyl acetate copolymer, and a sixth or surface layer of ethylene vinyl acetate copolymer; (d) melt forming a fourth component film comprising a first or surface layer of ethylene vinyl acetate copolymer, a second or core layer of linear low density polyethylene, and a third or surface layer of ethylene vinyl acetate copolymer; and (e) joining together and bonding said first, second, third, and fourth component films.
Claim 13
Dependent Claim
238 words
The process for making a composite film comprising: (a) melt forming a first component film of a first or surface layer of ethylene vinyl acetate copolymer, a second or core layer of linear low density polyethylene, and a third or surface layer of ethylene vinyl acetate copolymer; (b) melt forming a second component film comprising a first or surface layer of a blend of polyethylene and ethylene vinyl acetate copolymer, a second or interior layer of a blend of polyethylene and ethylene vinyl acetate copolymer, a third or adhesive layer, a fourth or interior layer of ethylene vinyl alcohol copolymer, a fifth or interior adhesive layer, and a sixth or surface layer of ethylene vinyl acetate copolymer; (c) melt forming a third component film comprising a first or surface layer of ethylene vinyl acetate copolymer, a second or interior layer of linear low density polyethylene, a third or interior layer of ethylene vinyl acetate copolymer, a fourth or barrier layer of vinylidene chloride copolymer, a fifth or interior layer of ethylene vinyl acetate copolymer, and a sixth or surface layer of ethylene vinyl acetate copolymer; (d) melt forming a fourth component film comprising a first or surface layer of ethylene vinyl acetate copolymer, a second or core layer of linear low density polyethylene, and a third or surface layer of ethylene vinyl acetate copolymer; and (e) joining together and bonding said first, second, third, and fourth component films.
Claim 14
Dependent Claim
27 words
The process for preparing a composite film according to claims 8 or 9 wherein the first, second, third, and fourth component films are bonded by corona bonding.
References Cited (Backward Citations)
GB2014471A
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GB2014476A
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GB2106471A
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GB2121062A
Cited
US4405667A
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US4501798A
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US4576988A
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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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |