US4769510A
Expired / Lapsed
US
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Process for the preparation of polyolefins
Assignee: Targor GmbH
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Filing: 1985-11-25
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Granted: 1988-09-06
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Expires: 2005-11-25
Abstract
Abstract In the polymerization of propylene and other higher 1-olefins, polymers which have a high degree of isotacticity and a narrow distribution of molecular weight are obtained in the presence of a catalyst system composed of a zirconium compound which is stereo-rigid and chiral and a linear or cyclic aluminoxane. In addition, the catalyst system is exceptionally active.
Inventors
- 👤 Walter Kaminsky
- 👤 Klaus Kulper
- 👤 Maria Buschermohle
- 👤 Hartmut Luker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:37
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; C07; C07F; C07F17/00; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592; C08F4/65922; C08F4/65927; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
A process for the preparation of polyolefins by polymerizing olefins of the formula CH 2 ═CHR in which R=C.sub.1 -C.sub.10 -alkyl, on their own or as a mixture, in solvents, liquid monomers or in the gas phase at a temperature from -50° to 200° C. by means of a soluble transition metal compound and aluminoxanes, which comprises carrying out the polymerization in the presence of a catalyst system which consists essentially of: (a) ethylene-bis-(4,5,6,7-tetrahydroindenyl)-zirconium dichloride, and (b) a methyl aluminoxane of the formula Al.sub.2 O(CH.sub.3).sub.4 (Al(CH.sub.3)O).sub.n, for a linear methyl aluminoxane, or (Al(CH.sub.3)O).sub.n+2 for a cyclic methyl aluminoxane, or combinations thereof, wherein n is a number from 4 to 20.
Claim 2
Dependent Claim
110 words
A process for the preparation of polyolefins by polymerizing olefins of the formula CH 2 ═CHR in which R=C.sub.1 -C.sub.10 -alkyl, on their own or as a mixture, in solvents, liquid monomers or in the gas phase at a temperature from -50° to 200° C. by means of a soluble transition metal compound and aluminoxanes, which comprises carrying out the polymerization in the presence of a catalyst system which consists essentially of: (a) ethylene-bis-(4,5,6,7-tetrahydroindenyl)-zirconium dichloride, and (b) a methyl aluminoxane of the formula Al.sub.2 O(CH.sub.3).sub.4 (Al(CH.sub.3)O).sub.n, for a linear methyl aluminoxane, or (Al(CH.sub.3)O).sub.n+2 for a cyclic methyl aluminoxane, or combinations thereof, wherein n is a number from 4 to 20.
Claim 3
Dependent Claim
24 words
The process as claimed in claim 1 wherein said olefin or olefins of the formula CH 2 ═CHR are mixed with ethylene when polymerized.
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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |