Patent US4258166A successfully refreshed from Google Patents.
US4258166A
Expired / Lapsed
US
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Low density polyethylene film
Assignee: Mobil Oil AS
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Filing: 1979-06-08
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Granted: 1981-03-24
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Expires: 1999-06-08
Abstract
Abstract There is disclosed herein a uniaxially oriented plastic film material having improved strength and clarity in the direction of orientation with unexpected improvement in strength in the transverse (unoriented) direction. Preferred film materials of homopolymers and copolymers of ethylene having a density of 0.915 to 0.935 g/cm3.
Inventors
- 👤 Peter J. Canterino
- 👤 Craig E. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:53
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/02; B29C55/04; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0641; C08J2323/00; C08J2323/02; C08J2323/04; Y; Y10; Y10S; Y10S526/00; Y10S526/937
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A uniaxially oriented thermoplastic film having improved film strength in the direction transverse to the direction of orientation, said film comprising low density polyethylene which has been stretched in a single direction at a temperature below its crystalline melting point, said low density polyethylene film being characterized by a density, prior to stretching, of within the approximate range of 0.915 g/cm 3 to 0.935 g/cm 3 .
Claim 2
Dependent Claim
67 words
A uniaxially oriented thermoplastic film having improved film strength in the direction transverse to the direction of orientation, said film comprising low density polyethylene which has been stretched in a single direction at a temperature below its crystalline melting point, said low density polyethylene film being characterized by a density, prior to stretching, of within the approximate range of 0.915 g/cm 3 to 0.935 g/cm 3 .
Claim 3
Dependent Claim
64 words
A uniaxially oriented thermoplastic film having improved film strength in the direction transverse to the direction of orientation, said film comprising an ethylene-containing polymer wherein the proportion attributable to ethylene comprises at least 80% by weight of said polymer, said film being further characterized by a density, prior to stretching, of within the approximate range of 0.915 g/cm 3 to 0.935 g/cm 3 .
Claim 4
Dependent Claim
64 words
A uniaxially oriented thermoplastic film having improved film strength in the direction transverse to the direction of orientation, said film comprising an ethylene-containing polymer wherein the proportion attributable to ethylene comprises at least 80% by weight of said polymer, said film being further characterized by a density, prior to stretching, of within the approximate range of 0.915 g/cm 3 to 0.935 g/cm 3 .
Claim 5
Dependent Claim
22 words
A uniaxially oriented film in accordance with claim 2 wherein said ethylene-containing polymer is a copolymer of ethylene with other unsaturated monomers.
Claim 6
Dependent Claim
44 words
The film of claim 3 wherein said copolymer is a copolymer of ethylene with one or more members of the group of unsaturated monomers consisting of: acrylic acid, esters of acrylic acid, vinyl esters, and olefins having from 3 to about 8 carbon atoms.
References Cited (Backward Citations)
US3558580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |