EP0364290A2
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EP
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Process for producing polyethylenes
Assignee: Eneos Corp
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Filing: 1989-10-13
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Granted: —
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Expires: 2009-10-13
Abstract
Abstract A process for producing polyethylene is disclosed in which ethylene is polymerized in the presence of a composite catalyst. The catalyst is made up of a solid catalyst component typified by a selected chromium compound, a modified aluminum compound typified by a trialkylaluminum and an R 1 n Al(OR²) 3-n compound where R¹ and R² are represented by selected hydrocarbon groups and n by 0 ≦ n ≦ 3. The polymer has improved melt index, flow parameter and melt tension characteristics.
Inventors
- 👤 Yoshio Tajima
- 👤 Kazutoshi Nomiyama
- 👤 Nobuyuki Kuroda
- 👤 Kazuo Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 04:30
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/639
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
A process for producing ethylene homopolymers or copolymers which comprises homopolymerizing ethylene or copolymerizing the same with an α-olefin of 3 to 12 carbon atoms in the presence of a composite catalyst comprising: (I) a solid catalyst component containing a chromium oxide, or a chromium compound capable of partially forming a chromium oxide upon calcination, supported on an inorganic oxide carrier and subsequently calcined; (II) a modified aluminum compound resulting from reaction of an organoaluminum compound with water and having one or more Al-O-Al bonds in the molecule; and (III) a compound of the formula R 1 n Al(OR²) 3-n where R¹ and R² each are hydrocarbon groups of from 1 to 18 carbon atoms, R¹ and R² being the same or different, and n is 0 ≦ n ≦ 3.
Claim 2
Dependent Claim
131 words
A process for producing ethylene homopolymers or copolymers which comprises homopolymerizing ethylene or copolymerizing the same with an α-olefin of 3 to 12 carbon atoms in the presence of a composite catalyst comprising: (I) a solid catalyst component containing a chromium oxide, or a chromium compound capable of partially forming a chromium oxide upon calcination, supported on an inorganic oxide carrier and subsequently calcined; (II) a modified aluminum compound resulting from reaction of an organoaluminum compound with water and having one or more Al-O-Al bonds in the molecule; and (III) a compound of the formula R 1 n Al(OR²) 3-n where R¹ and R² each are hydrocarbon groups of from 1 to 18 carbon atoms, R¹ and R² being the same or different, and n is 0 ≦ n ≦ 3.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein said catalyst component is selected from the group consisting of chromium trioxide, chromyl chloride, potassium bichromate, ammonium chromate, chromium nitrate, chromium acetate, chromium acetyl acetate and di-tert-butyl chromate.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein said carrier is selected from the group consisting of silica, alumina, silica-alumina, titania, silica-titania, zirconia, tria and combinations thereof.
Claim 5
Dependent Claim
46 words
The process of claim 1 wherein said organoaluminum compound is represented by the formula R n AlX 3-n where R is a hydrocarbon group of from 1 to 18 carbon atoms, X is a hydrogen or halogen atom, and n is 0 < n ≦ 3.
Claim 6
Dependent Claim
36 words
The process of claim 4 wherein said organoaluminum compound is a trialkylaluminum in which the alkyl group is selected from the group consisting of methyl, ethyl, propyl, iso-propyl, butyl, iso-butyl, pentyl, hexyl, octyl, decyl and dodecyl.
Claim 7
Dependent Claim
38 words
The process of claim 1 wherein said compound of R 1 n Al(OR²) 3-n is selected from the group consisting of (C₂H₅)₂AlOC₂H₅, C₂H₅Al(OC₂H₅)₂, Al(OC₂H₅)₃, (C₂H₅)₂AlO-iso-C₃H₇, C₂H₅Al(O-iso-C₃H₇)₂, Al(O-iso-C₃H₇)₃, (iso-C₄H₉)₂AlOC₂H₅, (iso-C₄H₉)₂AlO-iso-C₃H₇, iso-C₄H₉Al(OC₂H₅)₂, iso-C₄H₉Al(O-iso-C₃H₇)₂, (n-C₆H₁₁)₂AlOC₂H₅, (n-C₆H₁₁)₂AlO-iso-C₃H₇, n-C₆H₁₁Al(OC₂H₅)₂, (n-C₆H₁₁)₂AlO-iso-C₄H₇, Al(O-sec-C₄H₉)₃ and (C₂H₅)₂Al(OC₆H₅).
Claim 8
Dependent Claim
30 words
The process of claim 1 wherein the atomic ratio of component I to components II and III is in the range of from 0.01 to 1,000 in terms of Al:Cr.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein the molar ratio of component II and component III is in the range of from 0.01 to 100.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein either two or all of components I to III are contacted prior to incorporation into the reaction system.
Claim 11
Dependent Claim
21 words
The process of claim 1 wherein said α-olefin is selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methylpentene-1 and 1-hexene.
Claim 12
Dependent Claim
23 words
The process of claim 1 wherein the polymerization is effected in the presence of or in the absence of an inert hydrocarbon solvent.
Claim 13
Dependent Claim
24 words
The process of claim 11 wherein said solvent is selected from the group consisting of pentane, hexane, heptane, cyclohexane, methylcyclohexane, benzene, toluene and xylene.
Claim 14
Dependent Claim
31 words
The process of claim 11 wherein the polymerization reaction is effected at from 20 to 100°C and at from atmospheric pressure to 70 kg/cm²G for from 5 minutes to 10 hours.
References Cited (Backward Citations)
No citation records indexed.
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