Patent US4304685A successfully refreshed from Google Patents.
US4304685A
Expired / Lapsed
US
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Large pore alumina-supported transition metal alkyl
Assignee: EIDP Inc
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Filing: 1980-07-31
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Granted: 1981-12-08
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Expires: 2000-07-31
Abstract
Abstract In a process for polymerizing a 1-olefin with a catalyst system comprising a reaction product of a porous alumina and an organometallic compound of the formula (RCH 2 ) 4 M wherein M is Ti, Zr, or Hf and R is a group which is such that there is no hydrogen atom attached to an atom which is in the β-position to M, and more specifically, R is aryl, aralkyl, tertiary alkyl, for example, trialkylmethyl, or trialkylsilyl, the improvement characterized in that the alumina has an average pore diameter of at least about 150 A and/or at least about 10% of the total pore volume of the alumina is provided by pores having diameters greater than about 200 A.
Inventors
- 👤 Edward G. Howard, Jr.
- 👤 Walter Mahler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:15
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
In a 1-olefin polymerization catalyst system comprising a reaction product of a porous alumina and an organometallic compound of the formula (RCH 2 ) 4 M wherein M is Ti, Zr or Hf and R is a group which is such that there is no hydrogen atom attached to an atom which is in the β-position to M, the improvement characterized in that the alumina has an average pore diameter of at least about 150 A and/or at least about 10% of the total pore volume of the alumina is provided by pores having diameters greater than about 200 A.
Claim 2
Dependent Claim
100 words
In a 1-olefin polymerization catalyst system comprising a reaction product of a porous alumina and an organometallic compound of the formula (RCH 2 ) 4 M wherein M is Ti, Zr or Hf and R is a group which is such that there is no hydrogen atom attached to an atom which is in the β-position to M, the improvement characterized in that the alumina has an average pore diameter of at least about 150 A and/or at least about 10% of the total pore volume of the alumina is provided by pores having diameters greater than about 200 A.
Claim 3
Dependent Claim
16 words
Catalyst system of claim 1 wherein the alumina has a bulk density of about 0.30-0.35 g/ml.
Claim 4
Dependent Claim
14 words
Catalyst system of claim 1 wherein R is aryl, aralkyl, tertiary alkyl or trialkylsilyl.
Claim 5
Dependent Claim
17 words
Catalyst system of claim 1 wherein the atom which is in the β-position to M is carbon.
Claim 6
Dependent Claim
11 words
Catalyst system of claim 1 wherein the orgaometallic compound is tetraneophylzirconium.
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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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |