US4511609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer trash bag film
Assignee: Glad Products Co
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Filing: 1982-09-30
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Granted: 1985-04-16
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Expires: 2002-09-30
Abstract
Abstract A multilayer plastic film suitable for use in the manufacture of garbage and trash bags wherein the film comprises a first outer layer of low pressure, low density polyethylene, a core layer of high pressure, low density polyethylene, and a second outer layer of high pressure, low density polyethylene.
Inventors
- 👤 Joseph N. Craver
- 👤 Jerome T. Horner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:23
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/18; B32B27/20; B32B27/322; B65; B65D; B65D31/00; B65D31/02; B32B2307/00; B32B2307/40; B32B2307/402; B32B2307/4026; B32B2307/70; B32B2307/72; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; Y; Y10; Y10S; Y10S220/00; Y10S220/908; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
127 words
A method of preparing a multilayer film comprising coextruding a first outer layer consisting essentially of low pressure, low density polyethylene copolymer formed from ethylene and a comonomer selected from butene-1, pentene-1, hexene-1, heptene-1 and octene-1, and mixtures thereof, said copolymer having a melt index of between about 0.5 and about 3.0 decigrams per minute, and a density of between about 0.916 and about 0.930 grams per cubic centimeter, a core layer consisting essentially of high pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene, said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 2
Independent Claim
127 words
A method of preparing a multilayer film comprising coextruding a first outer layer consisting essentially of low pressure, low density polyethylene copolymer formed from ethylene and a comonomer selected from butene-1, pentene-1, hexene-1, heptene-1 and octene-1, and mixtures thereof, said copolymer having a melt index of between about 0.5 and about 3.0 decigrams per minute, and a density of between about 0.916 and about 0.930 grams per cubic centimeter, a core layer consisting essentially of high pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene, said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 3
Dependent Claim
118 words
A multilayer film consisting essentially of a first outer layer of low pressure, low density polyethylene copolymer formed from ethylene and a comonomer selected from butene-1, pentene-1, hexene-1, heptene-1 and ocetene-1, and mixtures thereof, said copolymer having a melt index of between about 0.5 and about 3.0 decigrams per minute, and a density of between about 0.916 and about 0.930 grams per cubic centimeter, a core layer of high pressure, low density polyethylene, and a second outer layer of high pressure, low density polyethylene, said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 4
Dependent Claim
118 words
A multilayer film consisting essentially of a first outer layer of low pressure, low density polyethylene copolymer formed from ethylene and a comonomer selected from butene-1, pentene-1, hexene-1, heptene-1 and ocetene-1, and mixtures thereof, said copolymer having a melt index of between about 0.5 and about 3.0 decigrams per minute, and a density of between about 0.916 and about 0.930 grams per cubic centimeter, a core layer of high pressure, low density polyethylene, and a second outer layer of high pressure, low density polyethylene, said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 5
Dependent Claim
24 words
A multilayer film as in claim 1 wherein said copolymer has a melt index of between about 0.6 and about 1.2 decigrams per minute.
Claim 6
Dependent Claim
41 words
A multilayer film as in claim 1 wherein said high pressure, low density polyethylene has a melt index of between about 1 to 3 decigrams per minute and a density of between about 0.916 and about 0.924 grams per cubic centimeter.
Claim 7
Dependent Claim
21 words
A multilayer film as in claim 1 wherein said low pressure, low density polyethylene comprises a copolymer of ethylene and butene-1.
Claim 8
Dependent Claim
36 words
A multilayer film as in claim 1 wherein the thickness ratio of said first outer layer to the combined thickness of said core layer and said second outer layer is between about 1:2 and about 1:3.
Claim 9
Dependent Claim
32 words
A multilayer film as in claim 1 wherein the thickness ratio of said first outer layer to the combined thickness of said core layer and said second outer layer is about 1:2.
Claim 10
Dependent Claim
16 words
A multilayer film as in claim 1 including a colorant selected from a pigment or dye.
Claim 11
Dependent Claim
24 words
A multilayer film as in claim 1 wherein the total thickness of said multilayer film in between about 1 mil and about 3 mils.
Claim 12
Dependent Claim
24 words
A multilayer film as in claim 1 wherein the total thickness of said multilayer film is between about 1.0 mils and about 1.5 mils.
Claim 13
Dependent Claim
10 words
A bag formed from the multilayer film of claim 1.
Claim 14
Dependent Claim
136 words
A multilayer film consisting essentially of a first outer layer of low pressure, low density polyethylene copolymer formed from ethylene and a comonomer selected from butene-1, pentene-1, hexene-1, heptene-1 and octene-1, and mixtures thereof, said copolymer having a melt index of between about 0.5 and about 3.0 decigrams per minute, and a density of between about 0.916 and about 0.930 grams per cubic centimeter, a core layer comprising one or more film layers wherein at least one of said film layers consists essentially of high pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene, said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 15
Dependent Claim
136 words
A multilayer film consisting essentially of a first outer layer of low pressure, low density polyethylene copolymer formed from ethylene and a comonomer selected from butene-1, pentene-1, hexene-1, heptene-1 and octene-1, and mixtures thereof, said copolymer having a melt index of between about 0.5 and about 3.0 decigrams per minute, and a density of between about 0.916 and about 0.930 grams per cubic centimeter, a core layer comprising one or more film layers wherein at least one of said film layers consists essentially of high pressure, low density polyethylene, and a second outer layer consisting essentially of high pressure, low density polyethylene, said high pressure, low density polyethylene having a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and about 0.930 grams per cubic centimeter.
Claim 16
Dependent Claim
29 words
A multilayer film as in claim 12 wherein said first outer layer comprises between about 25 percent and about 33 percent of the total thickness of said multilayer film.
Claim 17
Dependent Claim
12 words
A bag formed from the multilayer film of claim 12 or 13.
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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) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |