Patent US4312786A successfully refreshed from Google Patents.
US4312786A
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Process for polymerizing olefins and polymerization catalysts used therefor
Assignee: Equistar Chemicals LP
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Filing: 1980-05-30
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Granted: 1982-01-26
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Expires: 2000-05-30
Abstract
Abstract Olefins are polymerized in the presence of catalysts prepared by combining a heat activated supported organophosphoryl chromium compound with an alkyl borane which has been pretreated with hydrogen.
Inventors
- 👤 Stanley J. Katzen
- 👤 Louis J. Rekers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:41
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
161 words
A process for preparing an olefin catalyst which comprises: (a) depositing an organophosphoryl chromium compound obtained by reacting chromium trioxide with an organophosphorous compound having the formula ##STR3## wherein R is alkyl, aralkyl, cycloalkyl or hydrogen, but at least one R is other than hydrogen, upon a solid inorganic support material; (b) heat activating said support material containing said organophosphoryl chromium product at a temperature above about 200° C. and below the temperature at which the structure of the support is impaired, for a period of time sufficient to promote the activity of the catalyst; and, (c) combining the heat activated supported material of step (b) with triethyl borane which has been pretreated with hydrogen under reaction conditions sufficient to result in a catalyst which is capable of promoting the production of polyolefins of significantly higher melt index than attainable with the same catalyst except having been prepared with untreated triethyl borane which has not been pretreated by reaction with hydrogen.
Claim 2
Dependent Claim
161 words
A process for preparing an olefin catalyst which comprises: (a) depositing an organophosphoryl chromium compound obtained by reacting chromium trioxide with an organophosphorous compound having the formula ##STR3## wherein R is alkyl, aralkyl, cycloalkyl or hydrogen, but at least one R is other than hydrogen, upon a solid inorganic support material; (b) heat activating said support material containing said organophosphoryl chromium product at a temperature above about 200° C. and below the temperature at which the structure of the support is impaired, for a period of time sufficient to promote the activity of the catalyst; and, (c) combining the heat activated supported material of step (b) with triethyl borane which has been pretreated with hydrogen under reaction conditions sufficient to result in a catalyst which is capable of promoting the production of polyolefins of significantly higher melt index than attainable with the same catalyst except having been prepared with untreated triethyl borane which has not been pretreated by reaction with hydrogen.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the support material is a silica gel.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the support material is alumina.
Claim 5
Dependent Claim
45 words
The process of claim 1 wherein the triethyl borane is pretreated with hydrogen at temperatures of from about 90° C. to about 130° C. at pressures ranging from ambient to about 1,000 p.s.i. and for periods of from about 15 minutes to about 8 hours.
Claim 6
Dependent Claim
22 words
The process of claim 4 wherein the pretreatment of triethyl borane with hydrogen takes place in the presence of a hydrogenation catalyst.
Claim 7
Dependent Claim
42 words
The process of claim 5 wherein an organoaluminum compound is deposited upon the support prior to the organophosphoryl chromium compound and the supported organoaluminum compound is subjected to a heat activation operation carried out from about 90° C. to about 1100° C.
Claim 8
Dependent Claim
10 words
The catalyst system prepared by the process of claim 1.
Claim 9
Dependent Claim
10 words
The catalyst system prepared by the process of claim 6.
Claim 10
Dependent Claim
162 words
A process for preparing an olefin catalyst which comprises: (a) depositing an organophosphoryl chromium compound obtained by reacting chromium trioxide with an organophosphorus compound having the formula ##STR4## wherein R is alkyl, aralkyl, cycloalkyl or hydrogen, but at least one R is other than hydrogen, upon a solid inorganic support material; (b) heat activating said support material containing said organophosphoryl chromium product at a temperature above about 200° C. and below the temperature at which the structure of the support is impaired, for a period of time sufficient to promote the activity of the catalyst; and (c) combining the heat activated supported material of step (b) with an alkyl borane which has been pretreated with hydrogen under reaction conditions sufficient to result in a catalyst which is capable of promoting the production of polyolefins of significantly higher melt index than attainable with the same catalyst except having been prepared with untreated triethyl borane which has not been pretreated by reaction with hydrogen.
Claim 11
Dependent Claim
162 words
A process for preparing an olefin catalyst which comprises: (a) depositing an organophosphoryl chromium compound obtained by reacting chromium trioxide with an organophosphorus compound having the formula ##STR4## wherein R is alkyl, aralkyl, cycloalkyl or hydrogen, but at least one R is other than hydrogen, upon a solid inorganic support material; (b) heat activating said support material containing said organophosphoryl chromium product at a temperature above about 200° C. and below the temperature at which the structure of the support is impaired, for a period of time sufficient to promote the activity of the catalyst; and (c) combining the heat activated supported material of step (b) with an alkyl borane which has been pretreated with hydrogen under reaction conditions sufficient to result in a catalyst which is capable of promoting the production of polyolefins of significantly higher melt index than attainable with the same catalyst except having been prepared with untreated triethyl borane which has not been pretreated by reaction with hydrogen.
Claim 12
Dependent Claim
13 words
The process of claim 9 wherein the support material is a silica gel.
Claim 13
Dependent Claim
11 words
The process of claim 9 wherein the support material is alumina.
Claim 14
Dependent Claim
45 words
The process of claim 9 wherein the alkyl borane is pretreated with hydrogen at temperatures of from about 90° C. to about 130° C. at pressures ranging from ambient to about 1,000 p.s.i. and for periods of from about 15 minutes to about 8 hours.
Claim 15
Dependent Claim
22 words
The process of claim 12 wherein the pretrestment of alkyl borane with hydrogen takes place in the presence of a hydrogenation catalyst.
Claim 16
Dependent Claim
42 words
The process of claim 13 wherein an organoaluminum compound is deposited upon the support prior to the organophosphoryl chromium compound and the supported organoaluminum compound is subjected to a heat activation operation carried out from about 90° C. to about 1100° C.
Claim 17
Dependent Claim
10 words
The catalyst system prepared by the process of claim 9.
Claim 18
Dependent Claim
10 words
The catalyst system prepared by the process of claim 14.
References Cited (Backward Citations)
US3985676A
Cited
US3984351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |