Patent US3011935A successfully refreshed from Google Patents.
US4457960A
Expired / Lapsed
US
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Polymeric and film structure for use in shrink bags
Assignee: Rexam Beverage Can Co
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Filing: 1982-04-26
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Granted: 1984-07-03
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Expires: 2002-04-26
Abstract
Abstract Linear low density polyethylene is used in multiple layer, molecularly oriented films. Novel blends of linear low density polyethylene with ethylene vinyl acetate copolymer are disclosed, and used in molecularly oriented multiple layer films. Bags made from the multiple layer films are especially useful for shrink packaging, and particularly for shrink packaging of meats having large cavities.
Inventors
- 👤 David L. Newsome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:16
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B27/322; B65; B65D; B65D75/00; B65D75/002; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/0846; C08L23/0853; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/732; B32B2307/734; B32B2307/736; B32B2439/00; B32B2439/40; B32B2439/46; Y; Y10; Y10S; Y10S383/00; Y10S383/908; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1334; Y10T428/1341; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
88 words
An oriented multiple layer polymeric film, comprising: (a) a first barrier layer, said first layer having two opposing surfaces; (b) second and third layers adhered to said surfaces of said first layer, said second and third layers both having essentially the same composition; (c) a fourth layer adhered to one of said second and third layers; and (d) a fifth layer adhered to said fourth layer; said second, third and fifth layers comprising ethylene vinyl acetate, and said fourth layer comprising 10% to 100% linear low density polyethylene.
Claim 2
Dependent Claim
88 words
An oriented multiple layer polymeric film, comprising: (a) a first barrier layer, said first layer having two opposing surfaces; (b) second and third layers adhered to said surfaces of said first layer, said second and third layers both having essentially the same composition; (c) a fourth layer adhered to one of said second and third layers; and (d) a fifth layer adhered to said fourth layer; said second, third and fifth layers comprising ethylene vinyl acetate, and said fourth layer comprising 10% to 100% linear low density polyethylene.
Claim 3
Dependent Claim
16 words
An oriented film as in claim 1 wherein said barrier layer comprises polyvinyl chloride-polyvinylidene chloride copolymer.
Claim 4
Dependent Claim
16 words
An oriented film as in claim 1 wherein said barrier layer comprises ethylene vinyl alcohol copolymer.
Claim 5
Dependent Claim
92 words
An oriented multiple layer polymeric film, comprising: (a) a first barrier layer, said first layer having two opposing surfaces; (b) a second layer adhered to one said surface, said second layer being 10% to 90% linear low density polyethylene and 90% to 10% ethylene vinyl acetate; and (c) a third layer adhered to the other said surface, the composition of said third layer being selected from the group consisting of (i) ethylene vinyl acetate, and (ii) blends of 10% to 90% linear low density polyethylene with 90% to 10% ethylene vinyl acetate.
Claim 6
Dependent Claim
92 words
An oriented multiple layer polymeric film, comprising: (a) a first barrier layer, said first layer having two opposing surfaces; (b) a second layer adhered to one said surface, said second layer being 10% to 90% linear low density polyethylene and 90% to 10% ethylene vinyl acetate; and (c) a third layer adhered to the other said surface, the composition of said third layer being selected from the group consisting of (i) ethylene vinyl acetate, and (ii) blends of 10% to 90% linear low density polyethylene with 90% to 10% ethylene vinyl acetate.
Claim 7
Dependent Claim
16 words
An oriented film as in claim 4 wherein said barrier layer comprises polyvinyl chloride-polyvinylidene chloride copolymer.
Claim 8
Dependent Claim
16 words
An oriented film as in claim 4 wherein said barrier layer comprises ethylene vinyl alcohol copolymer.
Claim 9
Dependent Claim
31 words
An oriented film as in claim 5 or 6 wherein said third layer is a blend of 10% to 90% linear low density polyethylene and 90% to 10% ethylene vinyl acetate.
Claim 10
Dependent Claim
62 words
An oriented film as in claim 7 wherein said second and third layers are 20% to 40% linear low density polyethylene and 60% to 80% ethylene vinyl acetate, said ethylene vinyl acetate having a vinyl acetate content of 6% to 12% and a melt index of 0.3 to 0.9; said linear low density polyethylene having a melt index of 0.5 to 1.5.
Claim 11
Dependent Claim
198 words
An oriented multiple layer polymeric film comprising: (a) a first barrier layer, said first layer having two opposing surfaces; (b) second and third layers adhered to said surfaces of said first layer, said second and third layers both having essentially the same composition and comprising a first pair of layers; and (c) fourth and fifth layers adhered to said second and third layers on the respective surfaces opposite said first layer, said fourth and fifth layers having essentially the same composition and comprising a second pair of layers; in the combined composition of said first and second pairs of layers, at least one of said pairs comprising at least 50% of an ethylene vinyl acetate component, the remainder of said one pair being a linear low density polyethylene; and at least one of said pairs comprising at least 10% linear low density polyethylene component, the remainder of said one pair being said ethylene vinyl acetate, where the requirement for said components of at least 50% ethylene vinyl acetate and said 10% linear low density polyethylene may be met by one of said pairs having both said components or by each of said pairs having one of said components.
Claim 12
Dependent Claim
198 words
An oriented multiple layer polymeric film comprising: (a) a first barrier layer, said first layer having two opposing surfaces; (b) second and third layers adhered to said surfaces of said first layer, said second and third layers both having essentially the same composition and comprising a first pair of layers; and (c) fourth and fifth layers adhered to said second and third layers on the respective surfaces opposite said first layer, said fourth and fifth layers having essentially the same composition and comprising a second pair of layers; in the combined composition of said first and second pairs of layers, at least one of said pairs comprising at least 50% of an ethylene vinyl acetate component, the remainder of said one pair being a linear low density polyethylene; and at least one of said pairs comprising at least 10% linear low density polyethylene component, the remainder of said one pair being said ethylene vinyl acetate, where the requirement for said components of at least 50% ethylene vinyl acetate and said 10% linear low density polyethylene may be met by one of said pairs having both said components or by each of said pairs having one of said components.
Claim 13
Dependent Claim
16 words
An oriented film as in claim 9 wherein said barrier layer comprises polyvinyl chloride-polyvinylidene chloride copolymer.
Claim 14
Dependent Claim
16 words
An oriented film as in claim 9 wherein said barrier layer comprises ethylene vinyl alcohol copolymer.
Claim 15
Dependent Claim
39 words
An oriented film as in claim 9, 10, or 11 wherein said first pair of layers comprises 70% to 100% of said ethylene vinyl acetate and said second pair of layers comprises 10% to 90% linear low density polyethylene.
Claim 16
Dependent Claim
32 words
An oriented film as in claim 12 wherein said first pair of layers comprises 100% ethylene vinyl acetate and said second pair of layers comprises 50% to 90% linear low density polyethylene.
Claim 17
Dependent Claim
39 words
An oriented film as in claim 9, 10, or 11 wherein said first pair of layers comprises 50% to 100% linear low density polyethylene and said second pair of layers comprises 50% to 100% of said ethylene vinyl acetate.
Claim 18
Dependent Claim
34 words
An oriented film as in claim 14 wherein said first pair of layers comprises 90% to 100% linear low density polyethylene and said second pair of layers comprises 90% to 100% ethylene vinyl acetate.
Claim 19
Dependent Claim
20 words
An oriented film as in claim 1, 2 or 3 wherein said fourth layer is 100% linear low density polyethylene.
Claim 20
Dependent Claim
31 words
An oriented film as in claim 4, 5, 6, 9, 10, 11, 1 2, or 3 wherein the overall composition of said film comprises 20% to 30% linear low density polyethylene.
Claim 21
Dependent Claim
22 words
An oriented film as in claim 7 wherein the overall composition of said film comprises 20% to 30% linear low density polyethylene.
Claim 22
Dependent Claim
22 words
An oriented film as in claim 8 wherein the overall composition of said film comprises 20% to 30% linear low density polyethylene.
Claim 23
Dependent Claim
22 words
An oriented film as in claim 13 wherein the overall composition of said film comprises 20% to 30% linear low density polyethylene.
Claim 24
Dependent Claim
22 words
An oriented film as in claim 15 wherein the overall composition of said film comprises 20% to 30% linear low density polyethylene.
Claim 25
Dependent Claim
11 words
A shrink bag made from an oriented film of claim 17.
Claim 26
Dependent Claim
11 words
A shrink bag made from an oriented film of claim 18.
Claim 27
Dependent Claim
11 words
A shrink bag made from an oriented film of claim 19.
Claim 28
Dependent Claim
11 words
A shrink bag made from an oriented film of claim 20.
Claim 29
Dependent Claim
11 words
A shrink bag made from an oriented film 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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |