Patent US4504638A successfully refreshed from Google Patents.
US4504638A
Expired / Lapsed
US
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Ethylene polymers made from phosphate supported chromium catalyst
Assignee: Phillips Petroleum Co
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Filing: 1983-11-07
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Granted: 1985-03-12
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Expires: 2003-11-07
Abstract
Abstract In accordance with one embodiment of this invention, a chromium catalyst supported on an aluminum phosphate-containing base is used in conjunction with a boron component either as a part of the base or as a cocatalyst. The resulting catalyst is unique both in its favorable sensitivity to molecular weight control agents such as hydrogen and in its ability to produce a fundamentally different olefin polymer. In accordance with another embodiment of this invention, the chromium is supported on a phosphate base produced using a melt of the aluminum salt.
Inventors
- 👤 Max P. McDaniel
- 👤 Marvin M. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:19
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
A polymer made of a monomer composition consisting essentially of ethylene having a ratio of HLMI/MI to M w /M n of greater than 15 and a melt index within the range of 0.1 to 0.5 produced using a catalyst system comprising a chromium catalyst on an aluminum phosphate-containing support in conjunction with a trialkylborane cocatalyst, said trialkylborane having alkyl groups having 2 to 5 carbon atoms per group.
Claim 2
Dependent Claim
69 words
A polymer made of a monomer composition consisting essentially of ethylene having a ratio of HLMI/MI to M w /M n of greater than 15 and a melt index within the range of 0.1 to 0.5 produced using a catalyst system comprising a chromium catalyst on an aluminum phosphate-containing support in conjunction with a trialkylborane cocatalyst, said trialkylborane having alkyl groups having 2 to 5 carbon atoms per group.
Claim 3
Dependent Claim
15 words
A polymer according to claim 1 wherein said ratio is within the range of 17-31.
Claim 4
Dependent Claim
73 words
A thermoplastic polymer made of a monomer composition consisting essentially of ethylene having a relationship of environmental stress crack resistance to flexural modulus on or above curve B of FIG. 3 over a melt index range of 0.1 to 0.9, produced using a catalyst system comprising a chromium catalyst on an aluminum phosphate-containing support in conjunction with a trialkylborane cocatalyst, said trialkylborane having alkyl groups having 2 to 5 carbon atoms per group.
Claim 5
Dependent Claim
73 words
A thermoplastic polymer made of a monomer composition consisting essentially of ethylene having a relationship of environmental stress crack resistance to flexural modulus on or above curve B of FIG. 3 over a melt index range of 0.1 to 0.9, produced using a catalyst system comprising a chromium catalyst on an aluminum phosphate-containing support in conjunction with a trialkylborane cocatalyst, said trialkylborane having alkyl groups having 2 to 5 carbon atoms per group.
Claim 6
Dependent Claim
17 words
A polymer according to claim 1 wherein said trialkylboron cocatalyst used to prepare said polymer is triethylborane.
Claim 7
Dependent Claim
23 words
A polymer according to claim 3 further having a relationship of shear to melt index on or above curve C of FIG. 4.
Claim 8
Dependent Claim
43 words
A polymer according to claim 4 wherein said aluminum phosphate support is prepared by combining a molten aluminum salt with orthophosphoric acid and thereafter neutralizing to form aluminum orthophosphate having a phosphorus to aluminum atom ratio within the range of 0.2:1 to 1:1.
Claim 9
Dependent Claim
33 words
A polymer according to claim 6 wherein said chromium on said aluminum phosphate used to prepare said polymer is activated in air at a temperature within the range of 300° to 800° C.
Claim 10
Dependent Claim
17 words
A polymer according to claim 3 wherein said trialkylboron cocatalyst used to prepare said polymer is triethylborane.
Claim 11
Dependent Claim
43 words
A polymer according to claim 8 wherein said aluminum phosphate support is prepared by combining a molten aluminum salt with orthophosphoric acid and thereafter neutralizing to form aluminum orthophosphate having a phosphorus to aluminum atom ratio within the range of 0.2:1 to 1:1.
Claim 12
Dependent Claim
33 words
A polymer according to claim 9 wherein said chromium on said aluminum phosphate used to prepare said polymer is activated in air at a temperature within the range of 300° to 800° C.
Claim 13
Dependent Claim
20 words
A polymer according to claim 10 wherein said polymer has a melt index within the range of 0.1 to 0.5.
Claim 14
Dependent Claim
23 words
A polymer according to claim 11 wherein said polymer has a ratio of HLMI/MI to M w /M n of greater than 15.
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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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |