Patent US4740341A successfully refreshed from Google Patents.
US4740341A
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Linear polyethylene, fluorocarbon polymer and polyalkylsiloxane compositions, and improved method of film extrusion using same
Assignee: Mobil Oil AS
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Filing: 1986-08-29
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Granted: 1988-04-26
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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. 250 to 1000 ppm of each of a fluorocarbon polymer, e.g. polyvinylidene fluoride, and of a polyalkylsiloxane, e.g. poly(methyl-octyl-siloxane), to reduce melt fracture, head pressure and extruder power.
Inventors
- 👤 Shaw-Chang Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:04
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L2205/00; C08L2205/02; C08L2205/03; C08L2205/035; C08L27/00; C08L27/02; C08L27/12; C08L27/16; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A method of extruding a linear polyethylene polymer composition through a film extruder in which the improvement comprises incorporating 0.01 to 0.5 weight percent of said composition of a fluorocarbon polymer having a fluorine to carbon ratio of at least 1:2 which is fluid at temperatures of between 120° C. and 300° C.; and 0.01 to 0.5 weight percent of said composition of a polyalkylsiloxane consisting entirely of methyl-higher alkyl siloxane units or consisting of a major proportion of methyl-higher alkyl siloxane units and a minor proportion of other siloxane units, in which the fluorocarbon polymer and the polyalkylsiloxane are present in amounts to reduce melt fracture, reduce head pressure and reduce extruder power compared to extrusion without the fluorocarbon polymer and the polyalkylsiloxane.
Claim 2
Independent Claim
124 words
A method of extruding a linear polyethylene polymer composition through a film extruder in which the improvement comprises incorporating 0.01 to 0.5 weight percent of said composition of a fluorocarbon polymer having a fluorine to carbon ratio of at least 1:2 which is fluid at temperatures of between 120° C. and 300° C.; and 0.01 to 0.5 weight percent of said composition of a polyalkylsiloxane consisting entirely of methyl-higher alkyl siloxane units or consisting of a major proportion of methyl-higher alkyl siloxane units and a minor proportion of other siloxane units, in which the fluorocarbon polymer and the polyalkylsiloxane are present in amounts to reduce melt fracture, reduce head pressure and reduce extruder power compared to extrusion without the fluorocarbon polymer and the polyalkylsiloxane.
Claim 3
Dependent Claim
32 words
The method claim 1 in which said linear polyethylene polymer is a copolymer of ethylene and a higher olefin containing 4 to 10 carbon atoms, having a density of 0.90 to 0.94.
Claim 4
Dependent Claim
24 words
The method 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 5
Dependent Claim
24 words
The method 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 6
Dependent Claim
24 words
The method of claim 1 in which said linear polyethylene is a copolymer of ethylene and octene having a density of 0.90 and 0.94.
Claim 7
Dependent Claim
13 words
The method of claim 1 in which said fluorocarbon polymer is polyvinylidene fluoride.
Claim 8
Dependent Claim
33 words
The method of claim 6 in which said linear polyethylene polymer is a copolymer of ethylene and a higher olefin containing 4 to 10 carbon atoms, having a density of 0.90 and 0.94.
Claim 9
Dependent Claim
13 words
The method of claim 4 in which said fluorocarbon polymer is polyvinylidene fluoride.
Claim 10
Dependent Claim
31 words
The method of claim 1 in which said fluorocarbon polymer comprises 0.01 to 0.05 weight percent of the composition and said polyalkylsiloxane comprises 0.01 and 0.05 weight percent of the composition.
References Cited (Backward Citations)
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US4076698A
Cited
US4076698B1
Cited
GB934468A
Cited
US3125547A
Cited
US3865897A
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US3929708A
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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) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |