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US5314973A
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Silicon-bridged transition metal compounds
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1992-05-18
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Granted: 1994-05-24
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Expires: 2012-05-18
Abstract
Abstract Silicon-bridged transition metal compounds and their use as α-olefin polymerization catalysts are disclosed. A chiral silicon-bridged metallocene catalyst polymerizes α-olefins to high isotacity with a minimum of inversions at high rates of catalyst activity. The catalyst is easily made in high yields and readily separated from atactic meso forms.
Inventors
- 👤 Howard C. Welborn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:55
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07F; C07F17/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/619; C08F4/61912; C08F4/6192; C08F4/61922; C08F4/61927; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/65916; C08F4/6592; C08F4/65922; C08F4/65927; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A process for polymerizing α-olefins, which comprises contacting alpha-olefins having two or more carbon atoms under polymerization conditions with a catalyst system; comprising: (a) a transition metal compound represented by formula: ##STR6## wherein M' is a Group IV-B transition metal; X' and X" are the same or different hydride, halogen, hydrocarbyl or halohydrocarbyl having up to about 6 carbon atoms; A' and A" are the same or different asymmetrical mononuclear or polynuclear hydrocarbyl or silahydrocarbyl moieties; and S' is a bridge of 1-4 atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene; and (b) an organoaluminum component.
Claim 2
Dependent Claim
100 words
A process for polymerizing α-olefins, which comprises contacting alpha-olefins having two or more carbon atoms under polymerization conditions with a catalyst system; comprising: (a) a transition metal compound represented by formula: ##STR6## wherein M' is a Group IV-B transition metal; X' and X" are the same or different hydride, halogen, hydrocarbyl or halohydrocarbyl having up to about 6 carbon atoms; A' and A" are the same or different asymmetrical mononuclear or polynuclear hydrocarbyl or silahydrocarbyl moieties; and S' is a bridge of 1-4 atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene; and (b) an organoaluminum component.
Claim 3
Dependent Claim
166 words
A process for producing poly alpha olefin which comprises contacting alpha-olefins having two or more carbon atoms under polymerization conditions with a catalyst system containing (a) a chiral transition metal compound represented by the formula: ##STR7## wherein M' is titanium, zirconium or hafnium; X' and X" are the same or different hydride, chlorine, bromine, iodine, or 1-6 carbon atom alkyl, haloalkyl, aryl or haloaryl; n and m are the same or different integers from 1 to 4; R' and R" are the same or different hydrocarbyl or silahydrocarbyl of 1-20 carbon atoms, and 0-2 silicon atoms, or taken together, two or more of R' or R" are hydrocarbylene or silahydrocarbylene of 1-20 carbon atoms and 0-2 silicon atoms; and S' is a chain of 0-4 carbon atoms and 1-2 silicon atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene, in which each silicon atom is disubstituted with the same or different hydrocarbyl having 1 to 5 carbon atoms; and (b) an organoaluminum component.
Claim 4
Dependent Claim
166 words
A process for producing poly alpha olefin which comprises contacting alpha-olefins having two or more carbon atoms under polymerization conditions with a catalyst system containing (a) a chiral transition metal compound represented by the formula: ##STR7## wherein M' is titanium, zirconium or hafnium; X' and X" are the same or different hydride, chlorine, bromine, iodine, or 1-6 carbon atom alkyl, haloalkyl, aryl or haloaryl; n and m are the same or different integers from 1 to 4; R' and R" are the same or different hydrocarbyl or silahydrocarbyl of 1-20 carbon atoms, and 0-2 silicon atoms, or taken together, two or more of R' or R" are hydrocarbylene or silahydrocarbylene of 1-20 carbon atoms and 0-2 silicon atoms; and S' is a chain of 0-4 carbon atoms and 1-2 silicon atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene, in which each silicon atom is disubstituted with the same or different hydrocarbyl having 1 to 5 carbon atoms; and (b) an organoaluminum component.
Claim 5
Dependent Claim
98 words
A process for producing stereo regular polyalpha-olefins under polymerization conditions comprising contacting alpha-olefins having two or more carbon atoms with: (a) a transition metal compound represented by the formula: ##STR8## wherein M' is a Group IV-B transition metal; X' and X" are the same or different hydride, halogen, hydrocarbyl or halohydrocarbyl having up to about 6 carbon atoms; A' and A" are the same or different asymmetrical mononuclear or polynuclear hydrocarbyl or silahydrocarbyl moieties; and S' is a bridge of 1-4 atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene and (b) an organoaluminum component.
Claim 6
Dependent Claim
98 words
A process for producing stereo regular polyalpha-olefins under polymerization conditions comprising contacting alpha-olefins having two or more carbon atoms with: (a) a transition metal compound represented by the formula: ##STR8## wherein M' is a Group IV-B transition metal; X' and X" are the same or different hydride, halogen, hydrocarbyl or halohydrocarbyl having up to about 6 carbon atoms; A' and A" are the same or different asymmetrical mononuclear or polynuclear hydrocarbyl or silahydrocarbyl moieties; and S' is a bridge of 1-4 atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene and (b) an organoaluminum component.
Claim 7
Dependent Claim
23 words
The process according to claim 1, 2 or 3 wherein the transition metal compound, the organoaluminum component, or both is on a support.
Claim 8
Dependent Claim
99 words
A process for polymerizing α-olefins which comprises contacting alpha-olefins containing two or more carbon atoms under polymerization conditions with a catalyst system comprising a transition metal compound represented by the following formula as a component: ##STR9## wherein M' is a Group IV-B transition metal; X' and X" are the same or different hydride, halogen, hydrocarbyl or halohydrocarbyl having up to about 6 carbon atoms; A' and A" are the same or different asymmetrical mononuclear or polynuclear hydrocarbyl or silahydrocarbyl moieties; and S' is a bridge of 1-4 atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene.
Claim 9
Dependent Claim
99 words
A process for polymerizing α-olefins which comprises contacting alpha-olefins containing two or more carbon atoms under polymerization conditions with a catalyst system comprising a transition metal compound represented by the following formula as a component: ##STR9## wherein M' is a Group IV-B transition metal; X' and X" are the same or different hydride, halogen, hydrocarbyl or halohydrocarbyl having up to about 6 carbon atoms; A' and A" are the same or different asymmetrical mononuclear or polynuclear hydrocarbyl or silahydrocarbyl moieties; and S' is a bridge of 1-4 atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene.
Claim 10
Dependent Claim
110 words
A process for polymerizing α-olefins which comprises contacting alpha-olefins containing two or more carbon atoms under polymerization conditions with a catalyst system, at least one component of which is on an inert support, comprising a transition metal compound represented by the following formula as a component: ##STR10## wherein M' is a Group IV-B transition metal; X' and X" are the same or different hydride, halogen, hydrocarbyl or halohydrocarbyl having up to about 6 carbon atoms; A' and A" are the same or different asymmetrical mononuclear or polynuclear hydrocarbyl or silahydrocarbyl moieties; and S' is a bridge of 1-4 atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene.
Claim 11
Dependent Claim
110 words
A process for polymerizing α-olefins which comprises contacting alpha-olefins containing two or more carbon atoms under polymerization conditions with a catalyst system, at least one component of which is on an inert support, comprising a transition metal compound represented by the following formula as a component: ##STR10## wherein M' is a Group IV-B transition metal; X' and X" are the same or different hydride, halogen, hydrocarbyl or halohydrocarbyl having up to about 6 carbon atoms; A' and A" are the same or different asymmetrical mononuclear or polynuclear hydrocarbyl or silahydrocarbyl moieties; and S' is a bridge of 1-4 atoms selected from the group consisting of silanylene, silaalkylene, oxasilanylene and oxasilaalkylene.
References Cited (Backward Citations)
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