US4356221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt-extruded multilayer polyethylene bag film
Assignee: Glad Products Co
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Filing: 1981-05-15
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Granted: 1982-10-26
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Expires: 2001-05-15
Abstract
Abstract A multi-layer polyethylene film especially suitable for garbage and refuse bags, comprising a first layer of at least 75 wt. % high pressure-low density polyethylene (HPLPDE), and at least a second layer of HPLDPE and low pressure-low density polyethylene (LPLDPE), in which the LPLDPE is less than about 25 wt. % of the LPLDPE plus HPLDPE total weight.
Inventors
- 👤 John Anthony
- 👤 Frank J. Velisek
- 👤 Paul D. Capponi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:10
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B32B27/32; B32B27/322; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C09; C09J; C09J123/00; C09J123/02; C09J123/04; B29C48/16; B29C48/17; B29C48/18; B29C48/21; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2995/00; B29K2995/0037; B29K2995/0063; B32B2250/00; B32B2250/02; B32B2250/03; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2439/00; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A melt-extruded multilayer polyethylene film consisting essentially of a first outer layer containing at least about 75 percent by weight, based on the weight of said first outer layer, of high pressure, low density polyethylene, and at least a second outer layer comprising a mixture of high pressure, low density polyethylene and low pressure, low density polyethylene, said high pressure, low density polyethylene and said low pressure, low density polyethylene having a density below about 0.93 grams per cubic centimeter.
Claim 2
Dependent Claim
80 words
A melt-extruded multilayer polyethylene film consisting essentially of a first outer layer containing at least about 75 percent by weight, based on the weight of said first outer layer, of high pressure, low density polyethylene, and at least a second outer layer comprising a mixture of high pressure, low density polyethylene and low pressure, low density polyethylene, said high pressure, low density polyethylene and said low pressure, low density polyethylene having a density below about 0.93 grams per cubic centimeter.
Claim 3
Dependent Claim
30 words
A multilayer polyethylene film according to claim 1 wherein said high pressure, low density polyethylene has a melt index of between about 1 and about 4 grams per 10 minutes.
Claim 4
Dependent Claim
26 words
A multilayer polyethylene film according to claim 1 wherein said low pressure, low density polyethylene has a melt index below about 3 grams per 10 minutes.
Claim 5
Dependent Claim
42 words
A multilayer polyethylene film according to claim 1 wherein said low pressure, low density polyethylene is present in said second outer layer in an amount of less than about 25 percent by weight based on the weight of said second outer layer.
Claim 6
Dependent Claim
45 words
A multilayer polyethylene film according to claim 1 wherein the thickness ratio of said second outer layer to said first outer layer is between about 1:2 and about 3:1, and the total thickness of said film is between about 1 mil and about 3 mils.
Claim 7
Dependent Claim
29 words
A multilayer polyethylene film according to claim 1 wherein said high pressure, low density polyethylene has a density of between about 0.916 and about 0.928 grams per cubic centimeter.
Claim 8
Dependent Claim
30 words
A multilayer polyethylene film according to claim 1 wherein said low pressure, low density polyethylene has a melt index of between about 0.6 and about 1.2 grams per 10 minutes.
Claim 9
Dependent Claim
29 words
A multilayer polyethylene film according to claim 1 wherein said low pressure, low density polyethylene has a density of between about 0.916 and about 0.923 grams per cubic centimeter.
Claim 10
Dependent Claim
45 words
A multilayer polyethylene film according to claim 1 wherein said low pressure, low density polyethylene is present in said second outer layer in an amount of between about 16 percent and about 22 percent by weight based on the weight of said second outer layer.
Claim 11
Dependent Claim
28 words
A multilayer polyethylene film according to claim 1 wherein said first outer layer contains at least about 82 percent by weight of said high pressure, low density polyethylene.
Claim 12
Dependent Claim
27 words
A multilayer polyethylene film according to claim 1 wherein said first outer layer contains less than about 12 percent by weight of low pressure, low density polyethylene.
Claim 13
Dependent Claim
29 words
A multilayer polyethylene film according to claim 1 wherein the thickness ratio of said second outer layer to said first outer layer is between about 1.5:1 and about 2.5:1.
Claim 14
Dependent Claim
23 words
A multilayer polyethylene film according to claim 1 wherein the total thickness of said film is between about 1.3 and about 1.8 mils.
Claim 15
Dependent Claim
22 words
A multilayer polyethylene film according to claim 1 wherein said low pressure, low density polyethylene comprises a copolymer of ethylene and butene-1.
Claim 16
Dependent Claim
26 words
A multilayer polyethylene film according to claim 1 wherein said low pressure, low density polyethylene comprises a terpolymer of ethylene, hexene-1, and either propylene or butene-1.
Claim 17
Dependent Claim
16 words
A multilayer polyethylene film according to claim 1 wherein said film is formed into a bag.
Claim 18
Dependent Claim
86 words
A bag comprising a melt-extruded multilayer polyethylene film wherein said film consists essentially of a first outer layer containing at least about 75 percent by weight, based on the weight of said first outer layer, of high pressure, low density polyethylene, and at least a second outer layer comprising a mixture of high pressure, low density polyethylene and low pressure, low density polyethylene, said high pressure, low density polyethylene and said low pressure, low density polyethylene having a density below about 0.93 grams per cubic centimeter.
Claim 19
Dependent Claim
86 words
A bag comprising a melt-extruded multilayer polyethylene film wherein said film consists essentially of a first outer layer containing at least about 75 percent by weight, based on the weight of said first outer layer, of high pressure, low density polyethylene, and at least a second outer layer comprising a mixture of high pressure, low density polyethylene and low pressure, low density polyethylene, said high pressure, low density polyethylene and said low pressure, low density polyethylene having a density below about 0.93 grams per cubic centimeter.
Claim 20
Dependent Claim
40 words
A bag according to claim 17 wherein said low pressure, low density polyethylene is present in said second outer layer in an amount of less than about 25 percent of weight based on the weight of said second outer layer.
References Cited (Backward Citations)
US3281501A
Cited
US3088848A
Cited
US3340328A
Cited
US3409574A
Cited
US3700759A
Cited
JPS5086750A
Cited
US3888709A
Cited
US4160053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |