US4128502A
Expired / Lapsed
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Ethylene polymerization catalyst
Assignee: BP Corp North America Inc
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Filing: 1977-12-02
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Granted: 1978-12-05
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Expires: 1997-12-02
Abstract
Abstract Polyethylene or ethylene copolymer containing up to about twenty percent of a C 3 to C 8 olefin can be made by using a solid catalyst component prepared from (1) a lower alkyl magnesium alkoxide or magnesium hydroxide, (2) a titanium-aluminum compound, and (3) a lower alkyl alkylaluminum dichloride. Said solid component can be used in conjunction with a trialkylaluminum promoter in a slurry or vapor phase polymerization process at moderate polymerization temperatures and pressures.
Inventors
- 👤 Nicholas K. Kildahl
- 👤 Peter Fotis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:06
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
193 words
A catalyst for polymerizing ethylene or ethylene containing a small amount of polymerizable C 3 to C 8 olefin comprising: (a) a solid catalyst component made from (1) a lower alkyl magnesium alkoxide or magnesium hydroxide, (2) a liquid titanium-aluminum compound which is the reaction product of aluminum chloride and a lower alkyl titanium (IV) alkoxide reacted at a temperature ranging from about 0° to about 150° C. in a mol ratio, said aluminum chloride to said alkoxide, between one-third to one and about two to one, and (3) a lower alkyl alkylaluminum dichloride, wherein (1) and (2) are reacted at a temperature ranging from about 0° to about 150° C. in amounts such that the molar ratio of elemental magnesium to elemental titanium ranges from about 0.5 to about 5, and wherein the product of the reaction of (1) and (2) is reacted with (3) at a temperature ranging from about -20° to about 150° C., the concentration of (3) ranging from about 1 to about 10 mols per mol of (1) employed; and (b) a lower alkyl trialkylaluminum promoter in an amount which is effective to increase the activity of (a).
Claim 2
Dependent Claim
193 words
A catalyst for polymerizing ethylene or ethylene containing a small amount of polymerizable C 3 to C 8 olefin comprising: (a) a solid catalyst component made from (1) a lower alkyl magnesium alkoxide or magnesium hydroxide, (2) a liquid titanium-aluminum compound which is the reaction product of aluminum chloride and a lower alkyl titanium (IV) alkoxide reacted at a temperature ranging from about 0° to about 150° C. in a mol ratio, said aluminum chloride to said alkoxide, between one-third to one and about two to one, and (3) a lower alkyl alkylaluminum dichloride, wherein (1) and (2) are reacted at a temperature ranging from about 0° to about 150° C. in amounts such that the molar ratio of elemental magnesium to elemental titanium ranges from about 0.5 to about 5, and wherein the product of the reaction of (1) and (2) is reacted with (3) at a temperature ranging from about -20° to about 150° C., the concentration of (3) ranging from about 1 to about 10 mols per mol of (1) employed; and (b) a lower alkyl trialkylaluminum promoter in an amount which is effective to increase the activity of (a).
Claim 3
Dependent Claim
22 words
The catalyst of claim 1 wherein the amount of promoter ranges from about 2 to about 100 millimols per gram of (a).
Claim 4
Dependent Claim
26 words
The catalyst of claim 2 wherein said magnesium alkoxide or magnesium hydroxide is a magnesium dialkoxide and said titanium (IV) alkoxide is a titanium (IV) tetraalkoxide.
Claim 5
Dependent Claim
26 words
The catalyst of claim 3 wherein said magnesium dialkoxide is magnesium diethoxide, said titanium (IV) tetraalkoxide is titanium tetrabutoxide, and said alkylaluminum dichloride is ethylaluminum dichloride.
Claim 6
Dependent Claim
10 words
The catalyst of claim 4 wherein said promoter is triethylaluminum.
Claim 7
Dependent Claim
194 words
A catalyst for polymerizing ethylene or ethylene containing a small amount of polymerizable C 3 to C 8 olefin comprising: (a) a solid catalyst component made from (1) a lower alkyl magnesium alkoxide or magnesium hydroxide, (2) a liquid titanium-aluminum compound which is the reaction product of aluminum chloride and a lower alkyl titanium (IV) alkoxide reacted at a temperature ranging from about 0° to about 150° C. in a mol ratio, said aluminum chloride to said alkoxide, between one-third to one and about two to one, and (3) a lower alkyl alkylaluminum dichloride, wherein (1) and (3) are reacted at a temperature ranging from about -20° to about 150° C. in amounts such that the molar ratio of (3) to (1) ranges from about 1 to about 10, and wherein the product of the reaction of (1) and (3) is reacted with (2) at a temperature ranging from about 0° to about 150° C. in amounts such that the molar ratio of elemental magnesium to elemental titanium ranges from about 0.5 to about 5; and (b) a lower alkyl trialkylaluminum promoter in any amount which is effective to increase the activity of (a).
Claim 8
Dependent Claim
194 words
A catalyst for polymerizing ethylene or ethylene containing a small amount of polymerizable C 3 to C 8 olefin comprising: (a) a solid catalyst component made from (1) a lower alkyl magnesium alkoxide or magnesium hydroxide, (2) a liquid titanium-aluminum compound which is the reaction product of aluminum chloride and a lower alkyl titanium (IV) alkoxide reacted at a temperature ranging from about 0° to about 150° C. in a mol ratio, said aluminum chloride to said alkoxide, between one-third to one and about two to one, and (3) a lower alkyl alkylaluminum dichloride, wherein (1) and (3) are reacted at a temperature ranging from about -20° to about 150° C. in amounts such that the molar ratio of (3) to (1) ranges from about 1 to about 10, and wherein the product of the reaction of (1) and (3) is reacted with (2) at a temperature ranging from about 0° to about 150° C. in amounts such that the molar ratio of elemental magnesium to elemental titanium ranges from about 0.5 to about 5; and (b) a lower alkyl trialkylaluminum promoter in any amount which is effective to increase the activity of (a).
Claim 9
Dependent Claim
23 words
The catalyst of claim 6 wherein the amount of the promoter ranges from about 2 to about 100 millimols per gram of (a).
Claim 10
Dependent Claim
26 words
The catalyst of claim 7 wherein said magnesium alkoxide or magnesium hydroxide is a magnesium dialkoxide and said titanium (IV) alkoxide is a titanium (IV) tetraalkoxide.
Claim 11
Dependent Claim
26 words
The catalyst of claim 8 wherein said magnesium dialkoxide is magnesium diethoxide, said titanium (IV) tetraalkoxide is titanium tetrabutoxide, and said alkylaluminum dichloride is ethylaluminum dichloride.
Claim 12
Dependent Claim
10 words
The catalyst of claim 9 wherein said promoter is triethylaluminum.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |