US4753995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions of linear polyethylene and polyvinylidene fluoride for film extrusion, and films thereof
Assignee: Mobil Oil AS
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Filing: 1986-08-29
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Granted: 1988-06-28
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Expires: 2006-08-29
Abstract
Abstract The extrudability of linear polymers of ethylene such as low density copolymers of ethylene and C4-C10 olefins (LLDPE) into thin films is improved by adding small amounts, e.g., 0.02 to 2 weight percent polyvinylidene fluoride to reduce melt fracture, head pressure and to obtain films having excellent anti-blocking characteristics.
Inventors
- 👤 Shaw-Chang Chu
- 👤 Richard G. Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:32
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L27/00; C08L27/02; C08L27/12; C08L27/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
An extruded film comprising a linear copolymer of ethylene and a higher olefin containing 4 to 10 carbon atoms, having a density of 0.90 to 0.94, and 0.02 to 2 weight percent of polyvinylidene fluoride homopolymer and having reduced blocking compared to a film of the same copolymer of ethylene containing the same weight of hexafluoropropylene-vinylidene fluoride copolymer.
Claim 2
Dependent Claim
58 words
An extruded film comprising a linear copolymer of ethylene and a higher olefin containing 4 to 10 carbon atoms, having a density of 0.90 to 0.94, and 0.02 to 2 weight percent of polyvinylidene fluoride homopolymer and having reduced blocking compared to a film of the same copolymer of ethylene containing the same weight of hexafluoropropylene-vinylidene fluoride copolymer.
Claim 3
Dependent Claim
24 words
The film of claim 1 in which said linear polyethylene is a copolymer of ethylene and butene having a density of 0.90 and 0.94.
Claim 4
Dependent Claim
24 words
The film of claim 1 in which said linear polyethylene is a copolymer of ethylene and hexene having a density of 0.90 and 0.94.
Claim 5
Dependent Claim
24 words
The film of claim 1 in which said linear polyethylene is a copolymer of ethylene and octene having a density of 0.90 and 0.94.
References Cited (Backward Citations)
US3125547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |