US5079317A
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Process for producing polyethylenes
Assignee: Eneos Corp
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Filing: 1989-10-11
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Granted: 1992-01-07
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Expires: 2009-10-11
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 n 1 Al(OR 2 ) 3-n compound wherein R 1 and R 2 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
- 👤 Yoshino Tajima
- 👤 Kazutoshi Nomiyama
- 👤 Nobuyuki Kuroda
- 👤 Kazuo Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:05
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
134 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 and 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 n 1 Al(OR 2 ) 3-n where R 1 and R 2 each are hydrocarbon groups of from 1 to 18 carbon atoms, R 1 and R 2 being the same or different, and n is 0≦n<3.
Claim 2
Dependent Claim
134 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 and 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 n 1 Al(OR 2 ) 3-n where R 1 and R 2 each are hydrocarbon groups of from 1 to 18 carbon atoms, R 1 and R 2 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
42 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
187 words
The process of claim 1 wherein said compound of R n 1 Al(OR 2 ) 3-n is selected from the group consisting of (C 2 H 5 ) 2 AlOC 2 H 5 , C 2 H 5 Al(OC 2 H 5 ) 2 , Al(OC 2 H 5 ) 3 , (C 2 H 5 ) 2 AlO-iso-C 3 H 7 , C 2 H 5 Al(O-iso-C 3 H 7 ) 2 , Al(O-iso-C 3 H 7 ) 3 , (iso-C 4 H 9 ) 2 AlOC 2 H 5 , (iso-C 4 H 9 ) 2 AlO-iso-C 3 H 7 , iso-C 4 H 9 Al(OC 2 H 5 ) 2 , iso-C 4 H 9 Al(O-iso-C 3 H 7 ) 2 , (n-C 6 H 11 ) 2 AlOC 2 H 5 , (n-C 6 H 11 ) 2 AlO-iso-C 3 H 7 , n-C 6 H 11 Al(OC 2 H 5 ) 2 , (n-C 6 H 11 ) 2 AlO-iso-C 4 H 7 , Al(O-sec-C 4 H 9 ) 3 and (C 2 H 5 ) 2 Al(OC 6 H 5 ).
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
34 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/cm 2 G for from 5 minutes to 10 hours.
References Cited (Backward Citations)
US4189402A
Cited
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| 3.5 Years (Year 4) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
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