Patent US4464426A successfully refreshed from Google Patents.
US4464426A
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Multilayer film having a layer of low pressure, low density heterogeneous ethylene copolymers
Assignee: Glad Products Co
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Filing: 1981-11-03
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Granted: 1984-08-07
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Expires: 2001-11-03
Abstract
Abstract A multilayer plastic film suitable for use in the manufacture of garbage and trash bags wherein the film comprises at least one layer of a high pressure low density polyethylene, and a layer comprising low pressure low density gas phase heterogeneous copolymers formed from ethylene, and at least one of propylene and butene-1 and at least one C5-C8 comonomer.
Inventors
- 👤 John Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:22
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B2270/00; B32B2307/00; B32B2307/40; B32B2307/402; B32B2307/4026; B32B2307/70; B32B2307/72; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
A coextruded multilayer film comprising a first outer layer of a high pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density gas phase heterogeneous ethylene copolymers formed from ethylene and at least one of propylene and butene-1 and at least one C 5 -C 8 comonomer, and a second outer layer comprising a high pressure, low density polyethylene, said copolymers having a melt index of between about 0.5 and about 5.0 decigrams per minute, and a density of between about 0.91 and about 0.94 grams per cubic centimeter.
Claim 2
Dependent Claim
93 words
A coextruded multilayer film comprising a first outer layer of a high pressure, low density polyethylene, a core layer consisting essentially of low pressure, low density gas phase heterogeneous ethylene copolymers formed from ethylene and at least one of propylene and butene-1 and at least one C 5 -C 8 comonomer, and a second outer layer comprising a high pressure, low density polyethylene, said copolymers having a melt index of between about 0.5 and about 5.0 decigrams per minute, and a density of between about 0.91 and about 0.94 grams per cubic centimeter.
Claim 3
Dependent Claim
16 words
A coextruded multilayer film as in claim 1 wherein said film is formed into a bag.
Claim 4
Dependent Claim
13 words
A coextruded multilayer film as in claim 1 including at least one colorant.
Claim 5
Dependent Claim
39 words
A coextruded multilayer film as in claim 1 wherein said copolymers have a melt index of between about 0.5 and about 2.0 decigrams per minute and a density of between about 0.926 and about 0.930 grams per cubic centimeter.
Claim 6
Dependent Claim
50 words
A coextruded multilayer film as in claim 1 wherein said first outer layer has a thickness of between about 50 percent and about 80 percent, and said second outer layer has a thickness of between about 20 percent and about 50 percent of the total thickness of said multilayer film.
Claim 7
Dependent Claim
24 words
A coextruded multilayer film as in claim 1 wherein the thickness of said multilayer film is between about 1 mil and about 3 mils.
Claim 8
Dependent Claim
42 words
A coextruded multilayer film as in claim 1 wherein said high pressure, low density polyethylene has a melt index of between about 0.5 and about 5.0 decigrams per minute and a density of between about 0.916 and 0.935 grams per cubic centimeter.
Claim 9
Dependent Claim
23 words
A coextruded multilayer film as in claim 1 wherein said heterogeneous ethylene copolymers are selected from the group consisting of ethylene-butene-hexene and ethylene-propylene-hexene.
Claim 10
Dependent Claim
142 words
A coextruded multilayer film comprising a first outer layer selected from high pressure, low density polyethylene or heterogeneous copolymers formed from ethylene and at least one of propylene and butene-1 and at least one C 5 -C 8 comonomer, a core layer consisting essentially of low pressure, low density gas phase heterogeneous copolymers formed from ethylene and at least one of propylene and butene-1 and at least one C 5 -C 8 comonomer, and a second outer layer selected from high pressure, low density polyethylene, or heterogeneous copolymers formed from ethylene and at least one of propylene and butene-1 and at least one C 5 -C 8 comonomer, or a blend thereof, said copolymers having a melt index of between about 0.5 and about 5.0 decigrams per minute, and a density of between about 0.91 and about 0.94 grams per cubic centimeter.
Claim 11
Dependent Claim
142 words
A coextruded multilayer film comprising a first outer layer selected from high pressure, low density polyethylene or heterogeneous copolymers formed from ethylene and at least one of propylene and butene-1 and at least one C 5 -C 8 comonomer, a core layer consisting essentially of low pressure, low density gas phase heterogeneous copolymers formed from ethylene and at least one of propylene and butene-1 and at least one C 5 -C 8 comonomer, and a second outer layer selected from high pressure, low density polyethylene, or heterogeneous copolymers formed from ethylene and at least one of propylene and butene-1 and at least one C 5 -C 8 comonomer, or a blend thereof, said copolymers having a melt index of between about 0.5 and about 5.0 decigrams per minute, and a density of between about 0.91 and about 0.94 grams per cubic centimeter.
Claim 12
Dependent Claim
16 words
A coextruded multilayer film as in claim 9 wherein said film is formed into a bag.
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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) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |