US4963419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer film having improved heat sealing characteristics
Assignee: Viskase Corp
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Filing: 1987-05-13
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Granted: 1990-10-16
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Expires: 2007-05-13
Abstract
Abstract A multilayer film is disclosed having improved heat sealing characteristics, comprising a first outer layer containing a heat sealable thermoplastic polymer having substantial freedom from cross-linking bonds, and a second layer containing a cross-linked ethylene polymer. In one embodiment the multilayer film is suitable for use in packaging primal and subprimal meat cuts, said film comprising a first outer layer containing a heat sealable thermoplastic polymer; a core layer comprising an oxygen barrier film; and a second outer layer comprising an ethylene polymer having siloxane cross-linking bonds. In another embodiment the multilayer film contains a second core layer containing an ethylene vinyl acetate copolymer, which is located between the barrier core layer and the second outer layer.
Inventors
- 👤 Stanley Lustig
- 👤 Jeffrey M. Schuetz
- 👤 Stephen J. Vicik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:17
CPC Classifications
B; B32; B32B; B32B1/00; B32B1/08; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/732; B32B2323/00; B32B2323/04; B32B2331/00; B32B2331/04; B32B2439/00; B32B2439/70; B32B2597/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T428/31587; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
46 words
A multilayer film having improved heat sealing characteristics, which comprises (a) a first outer layer containing a heat sealable thermoplastic polymer having substantial freedom from cross-linking bonds, and (b) a second layer having poor heat sealability and containing a cross-linked ethylene polymer containing siloxane cross-linking bonds.
Claim 2
Dependent Claim
46 words
A multilayer film having improved heat sealing characteristics, which comprises (a) a first outer layer containing a heat sealable thermoplastic polymer having substantial freedom from cross-linking bonds, and (b) a second layer having poor heat sealability and containing a cross-linked ethylene polymer containing siloxane cross-linking bonds.
Claim 3
Dependent Claim
14 words
The multilayer film of claim 1 wherein said second layer is an outer layer.
Claim 4
Dependent Claim
32 words
The multilayer film of claim 2 wherein said second layer is selected from the group consisting of low density polyethylene, high density polyethylene, very low density polyethylene and linear low density polyethylene.
Claim 5
Dependent Claim
31 words
The multilayer film of claim 2 wherein said second layer comprises a copolymer of ethylene and a monomer selected from the group consisting of vinyl acetate, ethyl acrylate and acrylic acid.
Claim 6
Dependent Claim
18 words
The multilayer film of claim 2 wherein said second layer comprises a polyethylene blend containing high density polyethylene.
Claim 7
Dependent Claim
32 words
The multilayer film of claim 2 wherein said second layer is selected from the group consisting of low density polyethylene, high density polyethylene, very low density polyethylene and linear low density polyethylene.
Claim 8
Dependent Claim
32 words
The multilayer film of claim 1 wherein and said second layer comprises a copolymer of ethylene and a monomer selected from the group consisting of vinyl acetate, ethyl acrylate and acrylic acid.
Claim 9
Dependent Claim
18 words
The multilayer film of claim 1 wherein said second layer comprises a polyethylene blend containing high density polyethylene.
Claim 10
Dependent Claim
15 words
The multilayer film of claim 1 containing a third layer of an oxygen barrier film.
Claim 11
Dependent Claim
43 words
The multilayer film of claim 1 wherein said first outer layer comprises a heat sealable polymer selected from the group consisting of an ethylene vinyl acetate copolymer, an ionomer, a propylene-ethylene copolymer, a very low density polyethylene, and a linear low density polyethylene.
Claim 12
Dependent Claim
17 words
The multilayer film of claim 10 wherein said first outer layer comprises an ethylene vinyl acetate copolymer.
Claim 13
Dependent Claim
56 words
A multilayer film, suitable for use in packaging primal and subprimal meat cuts and having improved heat sealing characteristics, said film comprising: (a) A first outer layer containing a heat sealable thermoplastic polymer; (b) A core layer comprising an oxygen barrier film; and (c) A second outer layer comprising an ethylene polymer having siloxane cross-linking bonds.
Claim 14
Dependent Claim
56 words
A multilayer film, suitable for use in packaging primal and subprimal meat cuts and having improved heat sealing characteristics, said film comprising: (a) A first outer layer containing a heat sealable thermoplastic polymer; (b) A core layer comprising an oxygen barrier film; and (c) A second outer layer comprising an ethylene polymer having siloxane cross-linking bonds.
Claim 15
Dependent Claim
43 words
The multilayer film of claim 12 wherein said first outer layer comprises a heat sealable polymer selected from the group consisting of an ethylene vinyl acetate copolymer, an ionomer, a propylene-ethylene copolymer, a very low density polyethylene, and a linear low density polyethylene.
Claim 16
Dependent Claim
17 words
The multilayer film of claim 13 wherein said first outer layer comprises an ethylene vinyl acetate copolymer.
Claim 17
Dependent Claim
40 words
The multilayer film of claim 14 wherein said first outer layer comprises an ethylene vinyl acetate copolymer blended with an ethylene polymer selected from the group consisting of high density polyethylene, very low density polyethylene, and linear low density polyethylene.
Claim 18
Dependent Claim
36 words
The multilayer film of claim 12 wherein said core layer is selected from the group consisting of (a) a vinylidene chloride-vinyl chloride copolymer, (b) a vinylidene chloride-methyl acrylate copolymer, and (c) an ethylene vinyl alcohol copolymer.
Claim 19
Dependent Claim
36 words
The multilayer film of claim 12 wherein said second outer layer comprises an ethylene polymer selected from the group consisting of low density polyethylene, high density polyethylene, very low density polyethylene, and linear low density polyethylene.
Claim 20
Dependent Claim
32 words
The multilayer film of claim 12 wherein said second outer layer comprises a copolymer of ethylene and a monomer selected from the group consisting of vinyl acetate, ethyl acrylate and acrylic acid.
Claim 21
Dependent Claim
19 words
The multilayer film of claim 12 wherein said second outer layer comprises a polyethylene blend containing high density polyethylene.
Claim 22
Dependent Claim
23 words
The multilayer film of claim 19 wherein the high density polyethylene is blended with very low density polyethylene or linear low density polyethylene.
Claim 23
Dependent Claim
66 words
A multilayer film, suitable for use in packaging primal meat cuts and having improved heat sealing characteristics, said film comprising: (a) A first outer layer containing a heat sealable thermoplastic polymer; (b) A first core layer comprising an oxygen barrier film; (c) A second core layer comprising an ethylene vinyl acetate copolymer; and, (d) A second outer layer comprising an ethylene polymer containing siloxane cross-linking bonds.
Claim 24
Dependent Claim
66 words
A multilayer film, suitable for use in packaging primal meat cuts and having improved heat sealing characteristics, said film comprising: (a) A first outer layer containing a heat sealable thermoplastic polymer; (b) A first core layer comprising an oxygen barrier film; (c) A second core layer comprising an ethylene vinyl acetate copolymer; and, (d) A second outer layer comprising an ethylene polymer containing siloxane cross-linking bonds.
Claim 25
Dependent Claim
43 words
The multilayer film of claim 23 wherein said first outer layer comprises a heat sealable polymer selected from the group consisting of an ethylene vinyl acetate copolymer, an ionomer, a propylene-ethylene copolymer, a very low density polyethylene, and a linear low density polyethylene.
Claim 26
Dependent Claim
17 words
The multilayer film of claim 24 wherein said first outer layer comprises an ethylene vinyl acetate copolymer.
Claim 27
Dependent Claim
40 words
The multilayer film of claim 23 wherein said first outer layer comprises an ethylene vinyl acetate copolymer blended with a polyethylene polymer selected from the group consisting of high density polyethylene, very low density polyethylene, and linear low density polyethylene.
Claim 28
Dependent Claim
36 words
The multilayer film of claim 21 wherein said core layer is selected from the group consisting of (a) a vinylidene chloride-vinyl chloride copolymer, (b) a vinylidene chloride-methyl acrylate copolymer, and (c) an ethylene vinyl alcohol copolymer.
Claim 29
Dependent Claim
20 words
The multilayer film of claim 21 wherein said second core layer comprises a blend of two ethylene vinyl acetate copolymers.
Claim 30
Dependent Claim
22 words
The multilayer film of claim 21 wherein said second core layer comprises a blend of ethylene vinyl acetate copolymer and a polyurethane.
Claim 31
Dependent Claim
36 words
The multilayer film of claim 21 wherein said second outer layer comprises an ethylene polymer selected from the group consisting of low density polyethylene, high density polyethylene, very low density polyethylene, and linear low density polyethylene.
Claim 32
Dependent Claim
32 words
The multilayer film of claim 21 wherein said second outer layer comprises a copolymer of ethylene and a monomer selected from the group consisting of vinyl acetate, ethyl acrylate and acrylic acid.
Claim 33
Dependent Claim
19 words
The multilayer film of claim 21 wherein said second outer layer comprises a polyethylene blend containing high density polyethylene.
Claim 34
Dependent Claim
23 words
The multilayer film of claim 30 wherein the high density polyethylene is blended with very low density polyethylene or linear low density polyethylene.
Claim 35
Dependent Claim
17 words
A plastic bag fabricated from a multilayer film in accordance with any of claims 1 through 31.
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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) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |