CA2000567A1
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Process for producing polyethylenes
Assignee: Eneos Corp
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Filing: 1989-10-12
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Granted: —
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Expires: 2009-10-12
Abstract
Abstract ABSTRACT OF THE DISCLOSURE 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 R1nA1(OR2)3-n compound where Rl 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
CA
Data Source
google_patents
Last Synchronized
2026-11-01 19:42
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
128 words
A process for producing ethylene homopolymers or copolymers which comprises homopolymerizing ethylene or copolymerizing the same with an .alpha.-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 chormium 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 A1-O-A1 bonds in the molecule; and (III) a compound of the formula R1nA1(OR2)3-nl 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 O ? n ? 3.
Claim 2
Dependent Claim
128 words
A process for producing ethylene homopolymers or copolymers which comprises homopolymerizing ethylene or copolymerizing the same with an .alpha.-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 chormium 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 A1-O-A1 bonds in the molecule; and (III) a compound of the formula R1nA1(OR2)3-nl 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 O ? n ? 3.
Claim 3
Dependent Claim
34 words
The process of claim 1 whereln said catalyst component is selected from the group consisting of chromium trioxide, chromyl chloride, potassium bichromate, ammonium chromate, chromium nitrate, chromium acetate, chormium 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
43 words
The process of claim 1 wherein said organoaluminum compound is represented by the formula RnA1X3-n where R is a hydrocarbon group of from l 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
34 words
The process of claim 1 wherein said compound of R1nA1(OR2)3-n is selected from ths group consisting of (C2H5)2A1OC2H5, C2H5A1(OC2H5)2, A1(OC2H5)3, (C2H5)2A1O-iso-C3H7, C2H5A1(O-iso-C3H7)2, A1(O-iso-C3H7)3, (iso-C4Hg)2A1OC2H5, (iso-C4Hg)2A1O-iso-C3H7, iso-C4H9A1(OC2H5)2, iso-C4H9A1(O-iso-C3H7)2, (n-C6H11)2A1OC2H5, (n-C6H11)2A1O-iso-C3H7, n-C6H11A1(OC2H5)2, (n-C6H11)2A1O-iso-C4H7, A1(O-sec-C4H9)3 and (C2H5)2A1(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 .alpha.-olefin is selected from the group consisting of propylene, l-butene, 1-pentene, 4-methylpentene-1 and l-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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