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US4496699A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for polymerizing high melt index olefins and polymerization catalysts used therefore

Assignee: Equistar Chemicals LP
•
Filing: 1982-11-12
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Granted: 1985-01-29
•
Expires: 2002-11-12
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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 15:40
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)

US3476724A Cited
US3985676A Cited
US3947433A Cited
US3984351A Cited
NL7905445A Cited
US4252926A Cited

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

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