US4870042A
Expired / Lapsed
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Catalyst for olefin polymerization
Assignee: Tonen General Sekiyu KK
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Filing: 1988-10-07
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Granted: 1989-09-26
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Expires: 2008-10-07
Abstract
Abstract A catalyst for olefin polymerization which comprises: (A) a catalyst component obtained by reacting (a) alkali metal boron hydride represented by the formula MBH 4 (where M denotes an alkali metal) with (b) pyrazole and subsequently reacting the reaction product with (c) a titanium compound or zirconium compound, and (B) aluminoxane.
Inventors
- 👤 Tadanao Kohara
- 👤 Satoshi Ueki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:40
CPC Classifications
C; C08; C08F; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
35 words
A catalyst comprising (i) a catalyst component obtained by reacting (a) an alkali metal boron hydride with (b) pyrazole and contacting the product therefrom with (c) a Group IVb metal compound, and (ii) and aluminoxane.
Claim 2
Dependent Claim
35 words
A catalyst comprising (i) a catalyst component obtained by reacting (a) an alkali metal boron hydride with (b) pyrazole and contacting the product therefrom with (c) a Group IVb metal compound, and (ii) and aluminoxane.
Claim 3
Dependent Claim
25 words
The catalyst in accordance with claim 1 wherein the alkali boron hydride is represented by the formula MBH 4 wherein M denotes an alkali metal.
Claim 4
Dependent Claim
18 words
The catalyst in accordance with claim 2 wherein the Group IVb metal is selected from zirconium and titanium.
Claim 5
Dependent Claim
21 words
The catalyst in accordance with claim 2 wherein the Group IV metal compound is a titanium halide or a zirconium halide.
Claim 6
Dependent Claim
21 words
The catalyst in accordance with claim 3 wherein the Group IV metal compound is a titanium halide or a zirconium halide.
Claim 7
Dependent Claim
16 words
The catalyst in accordance with claim 2 further characterized in being supported on a metal oxide.
Claim 8
Dependent Claim
17 words
The catalyst in accordance with claim 5 wherein the catalyst component is supported on the metal oxide.
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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |