US4481302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium on mixed metal phosphate base with organoboron cocatalyst
Assignee: Phillips Petroleum Co
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Filing: 1983-01-27
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Granted: 1984-11-06
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Expires: 2003-01-27
Abstract
Abstract A catalyst system suitable for olefin polymerization comprising a mixed phosphate base made up of 75-99 mole percent aluminum phosphate and 1 to 25 mole percent of a phosphate of at least one other metal selected from gallium, yttrium, zirconium, lanthanum, neodymium and thorium in conjunction with an organoboron cocatalyst. The resulting catalyst system is capable of giving ethylene polymer having relatively low melt index and at the same time exhibits great sensitivity to molecular weight control agents so as to enable the production of a broad spectrum of polymers so far as melt index is concerned from a single catalyst system.
Inventors
- 👤 Max P. McDaniel
- 👤 Marvin M. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:30
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
50 words
A catalyst system comprising: (a) a catalyst comprising a chromium component on a xerogel base comprising 75-99 mole percent aluminum phosphate and 1 to 25 mole percent of a phosphate of at least one other metal selected from gallium, yttrium, zirconium, lanthanum, neodymium and thorium; and (b) an organoboron cocatalyst.
Claim 2
Dependent Claim
50 words
A catalyst system comprising: (a) a catalyst comprising a chromium component on a xerogel base comprising 75-99 mole percent aluminum phosphate and 1 to 25 mole percent of a phosphate of at least one other metal selected from gallium, yttrium, zirconium, lanthanum, neodymium and thorium; and (b) an organoboron cocatalyst.
Claim 3
Dependent Claim
25 words
A catalyst system according to claim 1 wherein an atom ratio of phosphorus to metal including aluminum is within the range of 0.2:1 to 1:1.
Claim 4
Dependent Claim
13 words
A catalyst system according to claim 1 wherein said cocatalyst is a trialkylborane.
Claim 5
Dependent Claim
12 words
A catalyst system according to claim 1 wherein said cocatalyst is triethylborane.
Claim 6
Dependent Claim
23 words
A catalyst system according to claim 1 wherein an atom ratio of boron to chromium is within the range of 2:1 to 10:1.
Claim 7
Dependent Claim
36 words
A catalyst system according to claim 1 wherein the chromium of said chromium component is present in an amount within the range of 0.1 to 5 weight percent based on the weight of said xerogel base.
Claim 8
Dependent Claim
12 words
A catalyst system according to claim 1 wherein said metal is gallium.
Claim 9
Dependent Claim
12 words
A catalyst system according to claim 1 wherein said metal is yttrium.
Claim 10
Dependent Claim
12 words
A catalyst system according to claim 1 wherein said metal is zirconium.
Claim 11
Dependent Claim
12 words
A catalyst system according to claim 1 wherein said metal is lanthanum.
Claim 12
Dependent Claim
12 words
A catalyst system according to claim 1 wherein said metal is neodymium.
Claim 13
Dependent Claim
12 words
A catalyst system according to claim 1 wherein said metal is thorium.
Claim 14
Dependent Claim
51 words
A catalyst system according to claim 1 wherein said phosphate of said at least one other metal is present in an amount within the range of 5 to 20 mole percent based on the moles of phosphate of said at least one other metal plus the moles of said aluminum phosphate.
Claim 15
Independent Claim
117 words
A method for making a catalyst system comprising: (1) forming a catalyst by (a) forming a hydrogel comprising 75-99 mole percent aluminum phosphate and 1 to 25 mole percent of a phosphate of at least one other metal selected from gallium, yttrium, zirconium, lanthanum, neodymium and thorium; (b) removing water from said hydrogel to form a xerogel; (c) treating said xerogel at an elevated temperature in an oxidizing atmosphere; (d) introducing a chromium component either by coprecipitating the chromium component with said hydrogel or adding said chromium component to said hydrogel or adding said chromium component anhydrously to said xerogel prior to said treating in said oxidizing atmosphere; and (2) combining said catalyst with an organoboron cocatalyst.
Claim 16
Independent Claim
117 words
A method for making a catalyst system comprising: (1) forming a catalyst by (a) forming a hydrogel comprising 75-99 mole percent aluminum phosphate and 1 to 25 mole percent of a phosphate of at least one other metal selected from gallium, yttrium, zirconium, lanthanum, neodymium and thorium; (b) removing water from said hydrogel to form a xerogel; (c) treating said xerogel at an elevated temperature in an oxidizing atmosphere; (d) introducing a chromium component either by coprecipitating the chromium component with said hydrogel or adding said chromium component to said hydrogel or adding said chromium component anhydrously to said xerogel prior to said treating in said oxidizing atmosphere; and (2) combining said catalyst with an organoboron cocatalyst.
Claim 17
Dependent Claim
11 words
A method according to claim 14 wherein said cocatalyst is triethylborane.
Claim 18
Dependent Claim
31 words
A method according to claim 14 wherein said hydrogel is formed from a melt of a salt of at least one of said aluminum or said at least one other metal.
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |