US4343755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extruding ethylene polymers
Assignee: Union Carbide Corp
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Filing: 1979-08-08
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Granted: 1982-08-10
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Expires: 1999-08-08
Abstract
Abstract A process comprising forming an extrudate, preferably in the form of a film, from an ethylene polymer which, in an extruder, melts rapidly and experiences slow shear thinning by melt extruding said polymer through an extruder having an extrusion screw therein with a length to diameter ratio of between about 15:1 to 21:1.
Inventors
- 👤 John C. Miller
- 👤 Archibald L. Burnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:29
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/022; B29C48/25; B29C48/36; B29C48/395; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29K; B29K2023/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
41 words
A process comprising forming an extrudate from a rapidly melting ethylene polymer which experiences slow shear thinning by melt extruding said polymer through an extruder having an extrusion screw with a length to diameter ratio of between about 15:1 to 21:1.
Claim 2
Dependent Claim
41 words
A process comprising forming an extrudate from a rapidly melting ethylene polymer which experiences slow shear thinning by melt extruding said polymer through an extruder having an extrusion screw with a length to diameter ratio of between about 15:1 to 21:1.
Claim 3
Dependent Claim
23 words
A process as in claim 1 in which the extrusion screw has a length to diameter ratio of between about 15:1 to 18:1.
Claim 4
Dependent Claim
16 words
A process as in claim 2 in which said ethylene polymer is a copolymer of ethylene.
Claim 5
Dependent Claim
22 words
A process as in claim 3 in which ethylene polymer has a density of about 0.91 to 0.94 grams per cubic centimeter.
Claim 6
Dependent Claim
24 words
A process as in claim 4 in which said ethylene polymer has a melt index of about 0.1 to 10 grams per 10 minutes.
Claim 7
Dependent Claim
21 words
A process as in claim 5 in which said ethylene polymer has a molecular weight distribution of about 2 to 10.
Claim 8
Dependent Claim
34 words
A process as in claim 6 in which said ethylene polymer has a melt index of about 0.1 to 5.0 grams per 10 minutes, and a molecular weight distribution of about 2 to 4.
Claim 9
Dependent Claim
16 words
A process as in claim 1 in which said extrudate is in the form of film.
Claim 10
Dependent Claim
63 words
A process comprising forming an extrudate from a rapidly melting ethylene polymer which experiences slow shear thinning and which has a molecular weight distribution of about ≧2.2 to ≦3.6 and a melt index of about ≧0.5 to about ≦5.0 by melt extruding said polymer through an extruder having an extrusion screw with a length to diameter ratio of between about 15:1 to 21:1.
Claim 11
Dependent Claim
63 words
A process comprising forming an extrudate from a rapidly melting ethylene polymer which experiences slow shear thinning and which has a molecular weight distribution of about ≧2.2 to ≦3.6 and a melt index of about ≧0.5 to about ≦5.0 by melt extruding said polymer through an extruder having an extrusion screw with a length to diameter ratio of between about 15:1 to 21:1.
Claim 12
Dependent Claim
23 words
A process as in claim 9 in which the extrusion screw has a length to diameter ratio of between about 15:1 to 18:1.
Claim 13
Dependent Claim
18 words
A process as in claim 9 in which the ethylene polymer is a low density ethylene hydrocarbon copolymer.
Claim 14
Dependent Claim
40 words
A process as in claim 11 in which said copolymer is a copolymer of ethylene and at least one C 3 to C 8 alpha olefin having a melt index of about ≧0.5 to about ≦5.0 grams per 10 minutes.
Claim 15
Dependent Claim
33 words
A process as in claim 12 in which said copolymer is a copolymer of ≧90 mol percent ethylene and ≦10 mol percent of at least one C 3 to C 8 alpha olefin.
Claim 16
Dependent Claim
23 words
A process as in claim 13 in which said copolymer has a total unsaturation content of about ≧0.1 to ≦0.3 C=C/1000 C atoms.
Claim 17
Dependent Claim
20 words
A process as in claim 14 in which said copolymer has a melt flow ratio of about ≧18 to ≦36.
Claim 18
Dependent Claim
16 words
A process as in claim 9 in which said extrudate is in the form of film.
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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) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |