Patent US4364840A successfully refreshed from Google Patents.
US4364840A
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Phosphated silica-chromium catalyst with boron-containing cocatalyst
Assignee: Phillips Petroleum Co
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Filing: 1980-12-31
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Granted: 1982-12-21
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Expires: 2000-12-31
Abstract
Abstract A catalyst system suitable for olefin polymerization comprising a catalyst component made up of chromium on a phosphated silica-containing base and a boron-containing cocatalyst. The resulting catalyst is particularly sensitive to the effects of hydrogen as a molecular weight control agent, thus allowing the production of polymers of having a melt flow varying over a wide spectrum utilizing the same catalyst.
Inventors
- 👤 Max P. McDaniel
- 👤 Marvin M. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:58
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
105 words
A method of making a catalyst system comprising: (a) treating a silica-containing support with a phosphating agent and activating said thus treated catalyst in an oxidizing atmosphere at an elevated temperature, said support either having a chromium compound coprecipitated therewith or having a chromium compound added thereto prior to said activating in said oxidizing atmosphere, said phosphating agent being utilized in an amount sufficient to give 0.1 to 20 mole percent of said phosphating agent based on the moles of silica in said silica-containing support; and (b) combining a cocatalyst selected from trihydrocarbyl boron compounds, boron alkoxides and halogenated alkyl boron compounds with said catalyst.
Claim 2
Independent Claim
105 words
A method of making a catalyst system comprising: (a) treating a silica-containing support with a phosphating agent and activating said thus treated catalyst in an oxidizing atmosphere at an elevated temperature, said support either having a chromium compound coprecipitated therewith or having a chromium compound added thereto prior to said activating in said oxidizing atmosphere, said phosphating agent being utilized in an amount sufficient to give 0.1 to 20 mole percent of said phosphating agent based on the moles of silica in said silica-containing support; and (b) combining a cocatalyst selected from trihydrocarbyl boron compounds, boron alkoxides and halogenated alkyl boron compounds with said catalyst.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein said phosphating agent is phosphoric acid used in an amount within the range of 1 to 5 mole percent based on the moles of silica.
Claim 4
Dependent Claim
40 words
A method according to claim 1 wherein said silica, during said treating, is in the form of a xerogel produced by a process utilizing one of spray drying, tray drying, or oven drying to convert a hydrogel to the xerogel.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein said silica is treated by mixing said silica with phosphoric acid.
Claim 6
Dependent Claim
35 words
A method according to claim 1 wherein said treatment is carried out using a phosphating agent in an amount to give 0.01 to 0.5 milligrams phosphorus per square meter of surface area of said silica.
Claim 7
Dependent Claim
12 words
A method according to claim 1 wherein said cocatalyst is a trialkylborane.
Claim 8
Dependent Claim
15 words
A method according to claim 6 wherein said trialkylborane is one of triethylborane or tributylborane.
Claim 9
Dependent Claim
11 words
A method according to claim 1 wherein said cocatalyst is triethylborane.
Claim 10
Dependent Claim
11 words
A method according to claim 1 wherein said cocatalyst is tri-n-butylborane.
Claim 11
Dependent Claim
30 words
A method according to claim 1 wherein said chromium is present in an amount within the range of 0.1 to 5 weight percent based on the weight of said silica.
Claim 12
Dependent Claim
47 words
A method according to claim 1 wherein said silica-containing support is treated with said phosphating agent, heated for 2 to 60 minutes at 200°-600° C., cooled, said chromium compound is added and the resulting catalyst activated in air for 5 minutes to 24 hours at 300°-800° C.
Claim 13
Dependent Claim
46 words
A method according to claim 1 wherein said silica, during said treating, is in the form of a hydrogel and after said treating and before said activating the thus treated hydrogel is converted to a xerogel by one of spray drying, tray drying or oven drying.
Claim 14
Dependent Claim
28 words
A method according to claim 1 wherein said silica-containing support consists essentially of silica and up to 0.2 weight percent alumina based on the weight of said silica.
Claim 15
Dependent Claim
31 words
A method according to claim 13 wherein said silica is produced by a process utilizing one of spray drying, tray drying, or oven drying to convert silica hydrogel to a xerogel.
Claim 16
Dependent Claim
37 words
A method according to claim 14 wherein said silica is phosphated by mixing said silica with phosphoric acid in an amount to give 0.01 to 0.5 milligrams phosphorus per square meter of surface area of the silica.
Claim 17
Dependent Claim
12 words
A method according to claim 15 wherein said cocatalyst is a trialkylborane.
Claim 18
Dependent Claim
16 words
A method according to claim 16 wherein said cocatalyst is one of triethylborane, tripropylborane or tri-n-butylborane.
Claim 19
Dependent Claim
30 words
A method according to claim 17 wherein said chromium is present in an amount within the range of 0.1 to 5 weight percent based on the weight of said silica.
Claim 20
Dependent Claim
44 words
A method according to claim 18 wherein the phosphoric acid treated silica is heated for 1 minute to 10 hours at 200°-600° C., cooled, said chromium compound added and the resulting catalyst activated in air for 5 minutes to 24 hours at 300°-800° C.
Claim 21
Dependent Claim
20 words
A method according to claim 19 wherein said activation is carried out in air at a temperature of 400°-600° C.
Claim 22
Dependent Claim
26 words
A method according to claim 20 wherein said cocatalyst is present in an amount to give 2 to 5 atoms of boron per atom of chromium.
Claim 23
Dependent Claim
9 words
A catalyst produced by the method of claim 21.
Claim 24
Dependent Claim
9 words
A catalyst produced by the method of claim 1.
Claim 25
Dependent Claim
51 words
A catalyst system comprising (a) a catalyst comprising a chromium oxide on a phosphated silica-containing base wherein there is present 0.01 to 0.5 mg P/m 2 of silica surface as measured by BET nitrogen sorption; and (b) a cocatalyst selected from trihydrocarbyl boron compounds, boron alkoxides and halogenated alkyl boron compounds.
Claim 26
Dependent Claim
51 words
A catalyst system comprising (a) a catalyst comprising a chromium oxide on a phosphated silica-containing base wherein there is present 0.01 to 0.5 mg P/m 2 of silica surface as measured by BET nitrogen sorption; and (b) a cocatalyst selected from trihydrocarbyl boron compounds, boron alkoxides and halogenated alkyl boron compounds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |