Patent US2167482A successfully refreshed from Google Patents.
Patent US4173548A successfully refreshed from Google Patents.
US4173548A
Expired / Lapsed
US
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Ethylene polymerization catalyst and method
Assignee: Chemplex Co
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Filing: 1978-06-12
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Granted: 1979-11-06
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Expires: 1998-06-12
Abstract
Abstract A highly active catalyst for polymerizing ethylene to polyethylene and copolymers of ethylene with alpha-olefins having a narrow molecular weight distribution, a method of making the catalyst and a method of polymerizing in which the catalyst is prepared by forming a mixture of a porous support of silica, alumina, zirconia, thoria or mixtures and a chromium compound and an alkyl ester of boron containing 1-7 carbon atoms in the alkyl group or a halide of boron capable of reacting with the chromium compound and activating this mixture at an elevated temperature in a fluidized bed with a substantially dry reducing gas followed by fluidizing with an oxidizing gas at an elevated temperature.
Inventors
- 👤 Thomas J. Pullukat
- 👤 Mitsuzo Shida
- 👤 Raymond E. Hoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:46
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S502/00; Y10S502/506
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
130 words
A highly active catalyst for polymerizing ethylene to polyethylene or to copolymers of ethylene with alpha-olefins having a narrow molecular weight distribution, prepared by: forming a mixture of (1) a porous support of the class consisting of silica, alumina, zirconia, thoria and mixtures thereof, (2) a chromium compound and (3) an alkyl ester of boron containing 1 to about 7 carbon atoms in the alkyl group or a halide of boron, said (2) being reactive with (3) to form a chromium-boron compound upon heating, said mixture containing about 0.1-10 wt.% of boron and about 0.1-10 wt.% of chromium and (4) activating said mixture at an elevated temperature in a fluidized bed with a substantially dry reducing gas and then fluidizing (4) with (5) an oxidizing gas at an elevated temperature.
Claim 2
Dependent Claim
130 words
A highly active catalyst for polymerizing ethylene to polyethylene or to copolymers of ethylene with alpha-olefins having a narrow molecular weight distribution, prepared by: forming a mixture of (1) a porous support of the class consisting of silica, alumina, zirconia, thoria and mixtures thereof, (2) a chromium compound and (3) an alkyl ester of boron containing 1 to about 7 carbon atoms in the alkyl group or a halide of boron, said (2) being reactive with (3) to form a chromium-boron compound upon heating, said mixture containing about 0.1-10 wt.% of boron and about 0.1-10 wt.% of chromium and (4) activating said mixture at an elevated temperature in a fluidized bed with a substantially dry reducing gas and then fluidizing (4) with (5) an oxidizing gas at an elevated temperature.
Claim 3
Dependent Claim
9 words
The catalyst of claim 1 wherein (1) comprises silica.
Claim 4
Dependent Claim
28 words
The catalyst of claim 1 wherein (2) is a member of the class consisting of chromium trioxide, chromic nitrate, ammonium chromate and organochromates reactive with said boron ester.
Claim 5
Dependent Claim
31 words
The catalyst of claim 1 wherein said mixture of (1) and (2) is dried in a fluidized bed with a gas at a drying temperature prior to the addition of (3).
Claim 6
Dependent Claim
18 words
The catalyst of claim 1 wherein said gas of (4) comprises a mixture of nitrogen and carbon monoxide.
Claim 7
Dependent Claim
10 words
The catalyst of claim 1 wherein (2) is chromium acetylacetonate.
Claim 8
Dependent Claim
15 words
The catalyst of claim 5 wherein (4) contains at least 1 wt.% of carbon monoxide.
Claim 9
Dependent Claim
16 words
The catalyst of claim 1 wherein said elevated activation temperature of (4) is about 600°-900° C.
Claim 10
Dependent Claim
22 words
The catalyst of claim 1 wherein (5) comprises air followed by (6) cooling said mixture in an atmosphere of an inert gas.
Claim 11
Dependent Claim
11 words
The catalyst of claim 9 wherein said inert gas comprises nitrogen.
Claim 12
Dependent Claim
41 words
The catalyst of claim 1 wherein (1) comprises silica, (2) is a member of the class consisting of chromium trioxide, chromic nitrate, ammonium chromate and organochromates reactive with said boron ester and said elevated temperature of (4) is about 600°-900° C.
Claim 13
Dependent Claim
31 words
The catalyst of claim 11 wherein said mixture of (1) and (2) is dried in a fluidized bed with a gas at a drying temperature prior to the addition of (3).
Claim 14
Dependent Claim
22 words
The catalyst of claim 11 wherein (5) comprises air followed by (6) cooling said mixture in an atmosphere of an inert gas.
Claim 15
Independent Claim
133 words
The method of making a highly active catalyst for polymerizing ethylene to polyethylene or to copolymers of ethylene with alpha-olefins having a narrow molecular weight distribution, comprising: forming a mixture of (1) a porous support of the class consisting of silica, alumina, zirconia, thoria and mixtures thereof, (2) a chromium compound and (3) an alkyl ester of boron containing 1 to about 7 carbon atoms in the alkyl group or a halide of boron, said (2) being reactive with (3) to form a chromium-boron compound upon heating, said mixture containing about 0.1-10 wt.% of boron and about 0.1-10 wt.% of chromium, and (4) activating said mixture at an elevated temperature in a fluidized bed with a substantially dry reducing gas and then fluidizing (4) with (5) an oxidizing gas at an elevated temperature.
Claim 16
Independent Claim
133 words
The method of making a highly active catalyst for polymerizing ethylene to polyethylene or to copolymers of ethylene with alpha-olefins having a narrow molecular weight distribution, comprising: forming a mixture of (1) a porous support of the class consisting of silica, alumina, zirconia, thoria and mixtures thereof, (2) a chromium compound and (3) an alkyl ester of boron containing 1 to about 7 carbon atoms in the alkyl group or a halide of boron, said (2) being reactive with (3) to form a chromium-boron compound upon heating, said mixture containing about 0.1-10 wt.% of boron and about 0.1-10 wt.% of chromium, and (4) activating said mixture at an elevated temperature in a fluidized bed with a substantially dry reducing gas and then fluidizing (4) with (5) an oxidizing gas at an elevated temperature.
Claim 17
Dependent Claim
9 words
The method of claim 14 wherein (1) comprises silica.
Claim 18
Dependent Claim
28 words
The method of claim 14 wherein (2) is a member of the class consisting of chromium trioxide, chromic nitrate, ammonium chromate and organochromates reactive with said boron ester.
Claim 19
Dependent Claim
31 words
The method of claim 14 wherein said mixture of (1) and (2) is dried in a fluidized bed with a gas at a drying temperature prior to the addition of (3).
Claim 20
Dependent Claim
18 words
The method of claim 14 wherein said gas of (4) comprises a mixture of nitrogen and carbon monoxide.
Claim 21
Dependent Claim
10 words
The method of claim 14 wherein (2) is chromium acetylacetonate.
Claim 22
Dependent Claim
22 words
The method of claim 18 wherein (4) contains at least about 1 wt.% of carbon monoxide and the remainder an inert gas.
Claim 23
Dependent Claim
16 words
The method of claim 14 wherein said elevated activation temperature of (4) is about 600°-900° C.
Claim 24
Dependent Claim
22 words
The method of claim 14 wherein (5) comprises air followed by (6) cooling said mixture in an atmosphere of an inert gas.
Claim 25
Dependent Claim
11 words
The method of claim 22 wherein said inert gas comprises nitrogen.
Claim 26
Dependent Claim
41 words
The method of claim 14 wherein (1) comprises silica, (2) is a member of the class consisting of chromium trioxide, chromic nitrate, ammonium chromate and organochromates reactive with said boron ester and said elevated temperature of (4) is about 600°-900° C.
Claim 27
Dependent Claim
31 words
The method of claim 24 wherein said mixture of (1) and (2) is dried in a fluidized bed with a gas at a drying temperature prior to the addition of (3).
Claim 28
Dependent Claim
22 words
The method of claim 24 wherein (5) comprises air followed by (6) cooling said mixture in an atmosphere of an inert gas.
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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) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |