US4909726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact-resistant film for chub packaging
Assignee: Cryovac LLC
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Filing: 1988-09-06
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Granted: 1990-03-20
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Expires: 2008-09-06
Abstract
Abstract A multilayer film useful in chub packaging includes a heat sealable layer, an abuse layer of very low density polyethylene, a polyamide or copolyamide layer, an oxygen barrier layer, a layer comprising nylon 6 or nucleated nylon 6, and a self-weldable layer. An alternate construction can be made without the abuse layer of very low density polyethylene, and includes an additional self-weldable layer. The film is made of a double-wound lay-flat tubular film. The film exhibits excellent impact resistant properties.
Inventors
- 👤 Solomon Bekele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:42
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B32B27/36; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/30; B32B2307/31; B32B2323/00; B32B2323/04; B32B2323/046; B32B2331/00; B32B2331/04; B32B2367/00; B32B2377/00; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/1307; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
180 words
A multilayer hot blown film useful in chub packaging comprising: (a) an outer heat-sealable layer comprising a polymeric material selected from the group consisting of ethylene alpha-olefin copolymer, fractional melt index low density polyethylene, and an ethylene ester copolymer; (b) an abuse layer bonded to said heat-sealable layer and comprising an abuse-resistant polymeric material selected from the group consisting of very low density polyethylene, ethylene vinyl acetate copolymer with a fractional melt index, and ionomer; (c) a first bonding layer disposed between and bonding the abuse layer to a first intermediate layer, said bonding layer comprising a chemically modified polyolefinic adhesive; (d) a first intermediate layer comprising a copolyamide or nylon 6; (e) a core layer bonded to said first intermediate layer comprising an ethylene vinyl alcohol copolymer; (f) a second intermediate layer bonded to said core layer, and comprising a copolyamide, nylon 6 or nucleated nylon 6; and (g) a second bonding layer bonded to the second intermediate- layer comprising a self-weldable chemically modified polyolefinic adhesive; wherein the film is a lay-flat film having its self-weldable layers bonded together.
Claim 2
Dependent Claim
180 words
A multilayer hot blown film useful in chub packaging comprising: (a) an outer heat-sealable layer comprising a polymeric material selected from the group consisting of ethylene alpha-olefin copolymer, fractional melt index low density polyethylene, and an ethylene ester copolymer; (b) an abuse layer bonded to said heat-sealable layer and comprising an abuse-resistant polymeric material selected from the group consisting of very low density polyethylene, ethylene vinyl acetate copolymer with a fractional melt index, and ionomer; (c) a first bonding layer disposed between and bonding the abuse layer to a first intermediate layer, said bonding layer comprising a chemically modified polyolefinic adhesive; (d) a first intermediate layer comprising a copolyamide or nylon 6; (e) a core layer bonded to said first intermediate layer comprising an ethylene vinyl alcohol copolymer; (f) a second intermediate layer bonded to said core layer, and comprising a copolyamide, nylon 6 or nucleated nylon 6; and (g) a second bonding layer bonded to the second intermediate- layer comprising a self-weldable chemically modified polyolefinic adhesive; wherein the film is a lay-flat film having its self-weldable layers bonded together.
Claim 3
Dependent Claim
21 words
A multilayer hot blown film according to claim 1 wherein the heat-sealable ethylene ester copolymer comprises an ethylene vinyl acetate copolymer.
Claim 4
Dependent Claim
28 words
A multilayer hot blown film according to claim 2 wherein the ethylene vinyl acetate copolymer has a vinyl acetate content of between about 4% and 6% by weight.
Claim 5
Dependent Claim
27 words
A multilayer hot blown film according to claim 1 wherein the heat sealable ethylene alpha-olefin copolymer comprises a linear low density polyethylene or very low density polyethylene.
Claim 6
Dependent Claim
26 words
A multilayer hot blown film according to claim 1 wherein the first and second bonding layers comprise an ethylene vinyl acetate copolymer based chemically modified adhesive.
Claim 7
Dependent Claim
32 words
A multilayer hot blown film according to claim 1 wherein the first intermediate layer comprises a copolyamide selected from the group consisting of: (i) nylon 6/12 (ii) nylon 6/66 (iii) nylon 6/69.
Claim 8
Dependent Claim
26 words
A multilayer hot blown film according to claim 1 wherein the ethylene vinyl alcohol copolymer has an ethylene content of at least about 38 mole percent.
Claim 9
Dependent Claim
10 words
A chub package made from the film of claim 1.
Claim 10
Dependent Claim
145 words
A multilayer hot blown film useful in chub packaging comprising: (a) an outer heat sealable layer comprising a polymeric material selected from the group consisting of ethylene alpha-olefin copolymer, fractional melt index low density polyethylene, and an ethylene ester copolymer; (b) a first bonding layer disposed between and bonding the heat sealable layer to a first intermediate layer, said bonding layer comprising a chemically modified polyolefinic adhesive; (c) a first intermediate layer comprising nylon 6; (d) a core layer bonded to said first intermediate layer and comprising ethylene vinyl alcohol copolymer; (e) a second intermediate layer bonded to said core layer and comprising a copolyamide, nylon 6 or nucleated nylon 6; (f) a second bonding layer disposed between and bonding the second intermediate layer to a self-weldable layer, and comprising a chemically modified polyolefinic adhesive; and (g) a self-weldable layer comprising an ethylene ester copolymer.
Claim 11
Dependent Claim
145 words
A multilayer hot blown film useful in chub packaging comprising: (a) an outer heat sealable layer comprising a polymeric material selected from the group consisting of ethylene alpha-olefin copolymer, fractional melt index low density polyethylene, and an ethylene ester copolymer; (b) a first bonding layer disposed between and bonding the heat sealable layer to a first intermediate layer, said bonding layer comprising a chemically modified polyolefinic adhesive; (c) a first intermediate layer comprising nylon 6; (d) a core layer bonded to said first intermediate layer and comprising ethylene vinyl alcohol copolymer; (e) a second intermediate layer bonded to said core layer and comprising a copolyamide, nylon 6 or nucleated nylon 6; (f) a second bonding layer disposed between and bonding the second intermediate layer to a self-weldable layer, and comprising a chemically modified polyolefinic adhesive; and (g) a self-weldable layer comprising an ethylene ester copolymer.
Claim 12
Dependent Claim
23 words
A multilayer hot blown film according to claim 9 wherein the outer heat sealable ethylene ester copolymer comprises an ethylene vinyl acetate copolymer.
Claim 13
Dependent Claim
28 words
A multilayer hot blown film according to claim 10 wherein the ethylene vinyl acetate copolymer has a vinyl acetate content of between about 3% and 6% by weight.
Claim 14
Dependent Claim
30 words
A multilayer hot blown film according to claim 9 wherein the ethylene alpha-olefin copolymer is selected from the group consisting of linear low density polyethylene and very low density polyethylene.
Claim 15
Dependent Claim
24 words
A multilayer hot blown film according to claim 9 wherein the first bonding layer comprises an ethylene vinyl acetate copolymer based chemically modified adhesive.
Claim 16
Dependent Claim
32 words
A multilayer hot blown film according to claim 9 wherein the first intermediate layer comprises a copolyamide selected from the group consisting of: (i) nylon 6/12 (ii) nylon 6/66 (iii) nylon 6/69.
Claim 17
Dependent Claim
26 words
A multilayer hot blown film according to claim 9 wherein the ethylene vinyl alcohol copolymer has an ethylene content of at least about 38 mole percent.
Claim 18
Dependent Claim
24 words
A multilayer hot blown film according to claim 9 wherein the second bonding layer comprises an ethylene vinyl acetate copolymer based chemically modified adhesive.
Claim 19
Dependent Claim
21 words
A multilayer hot blown film according to claim 9 wherein the self-weldable ethylene ester copolymer comprises an ethylene vinyl acetate copolymer.
Claim 20
Dependent Claim
26 words
A multilayer hot blown film according to claim 17 wherein the ethylene vinyl acetate copolymer has a vinyl acetate content of between about 10% and 14%.
Claim 21
Dependent Claim
10 words
A chub package made from the film of claim 9.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |