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US4496699A
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Process for polymerizing high melt index olefins and polymerization catalysts used therefore
Assignee: Equistar Chemicals LP
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Filing: 1982-11-12
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Granted: 1985-01-29
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Expires: 2002-11-12
Abstract
Abstract A process is disclosed for polymerizing an olefin to provide a polyolefin of high melt index which comprises contacting the olefin with a catalyst system obtained by heat activating a supported organophosphoryl chromium compound obtained by the reaction of chromium trioxide with an organophosphorous compound having the formula: <IMAGE> wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen, but at least one R is other than hydrogen, and combining the heat activated supported material with a melt index increasing amount of at least one organoborane catalyst modifier having the formula: <IMAGE> wherein m and n each is zero or 1, R1 and R2 are each a hydrocarbyl group of from 1 to 10 carbon atoms, or one of R1 and R2 is hydrogen, or together R1 and R2 constitute a hydrocarbyl group of from 2 to 10 carbon atoms.
Inventors
- 👤 Louis J. Rekers
- 👤 Stanley J. Katzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:19
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A process for the polymerization of an olefin to provide a polyolefin of high melt index which comprises contacting the olefin with a catalyst system obtained by heat activating a supported organophosphoryl chromium compound obtained by the reaction of chromium trioxide with an organphosphorous compound having the formula: ##STR8## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen, but at least one R is other than hydrogen, and combining the heat activated supported material with a melt index increasing amount of at least one organoborane catalyst modifier having the formula: ##STR9## wherein m and n each is zero or 1, with the proviso that m and n are not both zero, R 1 and R 2 are each a hydrocarbyl group of from 1 to 10 carbon atoms, or one of R 1 and R 2 is hydrogen, or together R 1 and R 2 constitute a hydrocarbyl group of from 2 to 10 carbon atoms.
Claim 2
Dependent Claim
156 words
A process for the polymerization of an olefin to provide a polyolefin of high melt index which comprises contacting the olefin with a catalyst system obtained by heat activating a supported organophosphoryl chromium compound obtained by the reaction of chromium trioxide with an organphosphorous compound having the formula: ##STR8## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen, but at least one R is other than hydrogen, and combining the heat activated supported material with a melt index increasing amount of at least one organoborane catalyst modifier having the formula: ##STR9## wherein m and n each is zero or 1, with the proviso that m and n are not both zero, R 1 and R 2 are each a hydrocarbyl group of from 1 to 10 carbon atoms, or one of R 1 and R 2 is hydrogen, or together R 1 and R 2 constitute a hydrocarbyl group of from 2 to 10 carbon atoms.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said organoborane is combined with an alkyl borane compound.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein the alkyl borane compound is triethyl borane.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein the organoborane is combined with an alkyl aluminum compound.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein the alkyl aluminum compound is triethyl aluminum or triisobutyl aluminum.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the organoborane is selected from the group consisting of catechol borane, dimethoxy borane and ethoxy borane.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |