US4390573A
Expired / Lapsed
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Laminar thermoplastic film constructions
Assignee: Mobil Oil AS
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Filing: 1981-08-31
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Granted: 1983-06-28
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Expires: 2001-08-31
Abstract
Abstract Laminar thermoplastic film constructions comprising a layer of low density polyethylene bonded to a layer of a dissimilar polymer blend comprising high density polyethylene and polyethylene copolymers. In particular such copolymers comprise polyethylene copolymerized with another alpha olefin containing from about 3 up to about 15 carbon atoms. Such copolymers are also characterized by being linear, low density polymers having densities which are below about 0.94 grams/cc.
Inventors
- 👤 Edward M. Bullard
- 👤 Gregory M. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:02
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B32B27/06; B32B27/08; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A laminar film structure comprising at least one layer comprising a general purpose, low density polyethylene resin and laminated thereto a second thinner layer comprising a resinous blend of a high density polyethylene and a linear low density ethylene-alpha-olefin copolymer, wherein said blend contains a major amount of said copolymer, said layer of general purpose, low density polyethylene having a thickness on the order of from about 65% up to about 85% of the overall thickness of said laminate.
Claim 2
Dependent Claim
79 words
A laminar film structure comprising at least one layer comprising a general purpose, low density polyethylene resin and laminated thereto a second thinner layer comprising a resinous blend of a high density polyethylene and a linear low density ethylene-alpha-olefin copolymer, wherein said blend contains a major amount of said copolymer, said layer of general purpose, low density polyethylene having a thickness on the order of from about 65% up to about 85% of the overall thickness of said laminate.
Claim 3
Dependent Claim
29 words
A laminar film structure in accordance with claim 1 wherein said second layer comprises from about 10 percent up to about 50 percent of the total laminar film thickness.
Claim 4
Dependent Claim
21 words
A laminar film structure in accordance with claim 1 wherein said alpha-olefin comprises about 3 up to about 15 carbon atoms.
Claim 5
Dependent Claim
29 words
A laminar film structure in accordance with claim 1 wherein the concentration by weight of said alpha-olefin in said copolymer is from about 1.5 percent to about 10 percent.
Claim 6
Dependent Claim
21 words
A laminar film structure in accordance with claim 1 wherein said copolymer has a density below about 0.94 grams per c.c.
Claim 7
Dependent Claim
80 words
A laminar thermoplastic bag structure comprising at least two layers, an inner layer and an outer layer, said inner layer comprising a general purpose low density polyethylene and said outer layer comprising a resinous blend of a high density polyethylene and ethylene-alpha-olefin copolymer, wherein said blend contains a major amount of said copolymer said layer of low density polyethylene having a thickness on the order of from about 65% up to about 85% of the overall thickness of said laminate.
Claim 8
Dependent Claim
80 words
A laminar thermoplastic bag structure comprising at least two layers, an inner layer and an outer layer, said inner layer comprising a general purpose low density polyethylene and said outer layer comprising a resinous blend of a high density polyethylene and ethylene-alpha-olefin copolymer, wherein said blend contains a major amount of said copolymer said layer of low density polyethylene having a thickness on the order of from about 65% up to about 85% of the overall thickness of said laminate.
Claim 9
Dependent Claim
50 words
The laminar thermoplastic bag structure of claim 6 wherein said copolymer has a density below about 0.94 grams per c.c., said alpha-olefin is present in the copolymer in a concentration by weight of about 1.5 percent to about 10 percent, and said alpha-olefin comprises about 3 to 15 carbon atoms.
Claim 10
Dependent Claim
38 words
The bag structure of claim 6 wherein said copolymer is a linear low density copolymer consisting essentially of ethylene copolymerized with about 2 to 10% by weight of at least one alpha-olefin comprising butene-1, hexene-1, 4-methylpentene-1 or octene-1.
Claim 11
Dependent Claim
49 words
The bag structure of claim 6 wherein said copolymer consists essentially of ethylene copolymerized with about 4.8% octene-1having a melt index of about 2, and a density of about 0.926; and wherein said high density polyethylene has a melt index of about 0.35 and a density of about 0.963.
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) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |