US5066739A
Expired / Lapsed
US
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Olefin polymerization with cyclopentadienyl lanthanidealkyl of hydride in presence of hydrogen
Assignee: Phillips Petroleum Co
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Filing: 1990-07-30
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Granted: 1991-11-19
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Expires: 2010-07-30
Abstract
Abstract A process for polymerizing olefins using a catalyst comprising an organolanthanide compound is disclosed wherein the active lifetime of the catalyst is increased by the employment of hydrogen during the polymerization.
Inventors
- 👤 Ted M. Pettijohn
- 👤 Henry L. Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:09
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
126 words
A process for polymerizing ethylene comprising contacting ethylene under suitable reaction conditions with a catalyst comprising a catalytic amount of at least one compound of the formula Cp 2 MR wherein Cp is cyclopentadienyl or cyclopentadienyl substituted with an alkyl or an alkyl silyl radical, M is a metal selected from scandium, yttrium, and metals having atomic numbers in the range of 57 to 71, and R is selected from hydrogen, alkyl radicals having 1 to 12 carbon atoms, aralkyl radicals having 7 to 12 carbon atoms, aryl radicals containing 6 to 12 carbon atoms, and alkaryl radicals containing 7 to 12 carbon atoms, said polymerization being carried out in the presence of hydrogen in an amount sufficient to increase the active lifetime of the catalyst.
Claim 2
Dependent Claim
126 words
A process for polymerizing ethylene comprising contacting ethylene under suitable reaction conditions with a catalyst comprising a catalytic amount of at least one compound of the formula Cp 2 MR wherein Cp is cyclopentadienyl or cyclopentadienyl substituted with an alkyl or an alkyl silyl radical, M is a metal selected from scandium, yttrium, and metals having atomic numbers in the range of 57 to 71, and R is selected from hydrogen, alkyl radicals having 1 to 12 carbon atoms, aralkyl radicals having 7 to 12 carbon atoms, aryl radicals containing 6 to 12 carbon atoms, and alkaryl radicals containing 7 to 12 carbon atoms, said polymerization being carried out in the presence of hydrogen in an amount sufficient to increase the active lifetime of the catalyst.
Claim 3
Dependent Claim
32 words
A process according to claim 1 wherein said catalyst is prepared in situ by combining a compound of the formula Cp 2 MCl and an alkali or alkaline earth metal alkyl compound.
Claim 4
Dependent Claim
19 words
A method according to claim 2 wherein said compound of the formula Cp 2 MCl is reacted with butyllithium.
Claim 5
Dependent Claim
33 words
A process according to claim 3 wherein the molar ratio of the butyllithium to the compound of the formula Cp 2 MCl is in the range of from about 1:1 to about 15:1.
Claim 6
Dependent Claim
19 words
A process according to claim 4 wherein a compound of the formula Cp 2 ScCl is reacted with butyllithium.
Claim 7
Dependent Claim
21 words
A method according to claim 5 wherein said compound of the formula Cp 2 ScCl consists essentially of dipentamethylcyclopentadienyl scandium chloride.
Claim 8
Dependent Claim
32 words
A method according to claim 6 wherein said polymerization is conducted in the presence of at least one additional olefin selected from the group consisting of 1-hexene, propylene, butadiene, 1-butene and 4-methyl-1-pentene.
Claim 9
Dependent Claim
21 words
A process according to claim 6 wherein the molar ratio of butyllithium to Cp 2 ScCl is at least about 2.5:1.
Claim 10
Dependent Claim
52 words
A process according to claim 1 wherein said catalyst is prepared in situ by reacting butyllithium with a compound of the formula Cp 2 YCl(THF), wherein the molar ratio of the butyllithium to the compound of the formula Cp 2 YCl(THF) is in the range of from about 1:1 to about 15:1.
Claim 11
Dependent Claim
14 words
A process according to claim 9 wherein butyllithium is reacted with dipentamethylcyclopentadienyl yttrium chloride.(THF).
Claim 12
Dependent Claim
32 words
A process according to claim 10 wherein said polymerization is conducted in the presence of at least one additional olefin selected from the group consisting of 1-hexene, propylene, butadiene, 1-butene, and 4-methyl-1-pentene.
Claim 13
Dependent Claim
60 words
A process according to claim 1 wherein said catalyst is prepared in situ by reacting butyllithium with a compound of the formula (Cp* 2 YCl) 2 , wherein Cp* is pentamethylcyclopentadienyl and wherein the molar ratio of the butyllithium to the compound of the formula (Cp* 2 YCl) 2 is in the range of from about 1:1 to about 15:1.
Claim 14
Dependent Claim
32 words
A process according to claim 12 wherein the polymerization is conducted in the presence of at least one other olefin selected from the group consisting of 1-hexene, propylene, butadiene, 1-butene, and 4-methyl-1-pentene.
References Cited (Backward Citations)
US4716257A
Cited
US4665046A
Cited
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