Patent US6229540B1 successfully refreshed from Google Patents.
US5084540A
Expired / Lapsed
US
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Ethylene/butene-1 copolymers
Assignee: Montedison SpA
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Filing: 1990-11-20
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Granted: 1992-01-28
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Expires: 2010-11-20
Abstract
Abstract Crystalline copolymers of ethylene and alpha-olefins CH2=CHR in which R is an alkyl group having 2 to 8 carbon atoms, containing 0.5 to 3% by moles of polymerized alpha-olefin and having a density lower than 0.945 g/cc are obtained by polymerizing, in the gas phase, mixtures of ethylene and the alpha-olefins in contact with catalysts prepared from (1) Ti compounds supported on Mg halides and (2) organometallic compounds, which are active in the polymerization of ethylene but exhibit little, if any, activity in the homo- or copolymerization of the alpha-olefins.
Inventors
- 👤 Enrico Albizzati
- 👤 Umberto Zucchini
- 👤 Arrigo Soverini
- 👤 Illaro Cuffiani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:35
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
Crystalline copolymers of ethylene with butene-1 having a density between 0.910 and 0.945 g/cc, and a butene-1 content of 0.5 to 3% by moles selected from the group consisting of: a) a crystalline copolymer having a density of 0.945, a ratio R between the molar percentage of butene-1 and polymer density of 0.5, and a melting point of 130° C.; b) a crystalline copolymer having a density of 0.931, a ratio R between the molar percentage of butene-1 and polymer density of 0.8, and a melting point of 127° C.; c) a crystalline copolymer having a density of 0.9268, a ratio R between the molar percentage of butene-1 and polymer density of 1.5, and a melting point of 125° C.; d) a crystalline copolymer having a density of 0.921, a ratio R between the molar percentage of butene-1 and polymer density of 2.5, and a melting point of 121.5° C.; and e) a crystalline copolymer having a density of 0.910, a ratio R between the molar percentage of butene-1 and polymer density of 3.5, and a melting point of 110° C.
Claim 2
Dependent Claim
181 words
Crystalline copolymers of ethylene with butene-1 having a density between 0.910 and 0.945 g/cc, and a butene-1 content of 0.5 to 3% by moles selected from the group consisting of: a) a crystalline copolymer having a density of 0.945, a ratio R between the molar percentage of butene-1 and polymer density of 0.5, and a melting point of 130° C.; b) a crystalline copolymer having a density of 0.931, a ratio R between the molar percentage of butene-1 and polymer density of 0.8, and a melting point of 127° C.; c) a crystalline copolymer having a density of 0.9268, a ratio R between the molar percentage of butene-1 and polymer density of 1.5, and a melting point of 125° C.; d) a crystalline copolymer having a density of 0.921, a ratio R between the molar percentage of butene-1 and polymer density of 2.5, and a melting point of 121.5° C.; and e) a crystalline copolymer having a density of 0.910, a ratio R between the molar percentage of butene-1 and polymer density of 3.5, and a melting point of 110° C.
Claim 3
Dependent Claim
33 words
A crystalline copolymer of ethylene with butene-1 having a density of 0.931, a ratio R between the molar percentage of butene-1 and polymer density of 0.8, and a melting point of 127° C.
Claim 4
Dependent Claim
33 words
A crystalline copolymer of ethylene with butene-1 having a density of 0.931, a ratio R between the molar percentage of butene-1 and polymer density of 0.8, and a melting point of 127° C.
Claim 5
Dependent Claim
33 words
A crystalline copolymer of ethylene with butene-1 having a density of 0.9268, a ratio R between the molar percentage of butene-1 and polymer density of 1.5, and a melting point of 125° C.
Claim 6
Dependent Claim
33 words
A crystalline copolymer of ethylene with butene-1 having a density of 0.9268, a ratio R between the molar percentage of butene-1 and polymer density of 1.5, and a melting point of 125° C.
Claim 7
Dependent Claim
33 words
A crystalline copolymer of ethylene with butene-1 having a density of 0.921, a ratio R between the molar percentage of butene-1 and polymer density of 2.5, and a melting point of 121.5° C.
Claim 8
Dependent Claim
33 words
A crystalline copolymer of ethylene with butene-1 having a density of 0.921, a ratio R between the molar percentage of butene-1 and polymer density of 2.5, and a melting point of 121.5° C.
References Cited (Backward Citations)
GB1150814A
Cited
US3645992A
Cited
GB1355245A
Cited
US3901863A
Cited
US3920621A
Cited
US3981849A
Cited
US4089808A
Cited
US4243619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |