Patent US2518079A successfully refreshed from Google Patents.
Patent US4849487A successfully refreshed from Google Patents.
US4849487A
Expired / Lapsed
US
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1-olefin stereoblock polymer, and a process for its preparation
Assignee: Targor GmbH
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Filing: 1987-11-25
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Granted: 1989-07-18
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Expires: 2007-11-25
Abstract
Abstract Stereoblock polymers of 1-olefins having a broad uni-, bi-, tri- or multimodal molecular weight distribution are obtained when a catalyst which comprises a chiral metallocene containing bridges and an alumoxane is used for the polymerization of the 1-olefins. The polymers are particularly highly suitable for the production of transparent films.
Inventors
- 👤 Walter Kaminsky
- 👤 Maria Buschermohle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:41
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/639; C08F4/63912; C08F4/6392; C08F4/63922; C08F4/63927; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A process for the preparation of a 1-olefin stereoblock polymer through polymerization of a 1-olefin of the formula R-CH═CH 2 in which R is an alkyl group having 1 to 28 carbon atoms, at a temperature of -60° to 100° C., at a pressure of 0.5 to 60 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst which comprises metallocene compound and an alumoxane, the metallocene compound being tetramethylethylene-bis(cyclopentadienyl)-titanium dichloride, and the alumoxane being a compound of the formula II Al.sub.2 OR.sub.4 .sup.7 --[--Al(R.sup.7)--O--].sub.n -- (II) for the linear type or of the formula (III) --[--Al(R.sup.7 --O --]--.sub.n+2 for the cyclic type, or combinations thereof, and where, in the formulae II and III, R 7 denotes methyl, ethyl, or isobutyl, and n is an integer from 4 to 20.
Claim 2
Dependent Claim
136 words
A process for the preparation of a 1-olefin stereoblock polymer through polymerization of a 1-olefin of the formula R-CH═CH 2 in which R is an alkyl group having 1 to 28 carbon atoms, at a temperature of -60° to 100° C., at a pressure of 0.5 to 60 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst which comprises metallocene compound and an alumoxane, the metallocene compound being tetramethylethylene-bis(cyclopentadienyl)-titanium dichloride, and the alumoxane being a compound of the formula II Al.sub.2 OR.sub.4 .sup.7 --[--Al(R.sup.7)--O--].sub.n -- (II) for the linear type or of the formula (III) --[--Al(R.sup.7 --O --]--.sub.n+2 for the cyclic type, or combinations thereof, and where, in the formulae II and III, R 7 denotes methyl, ethyl, or isobutyl, and n is an integer from 4 to 20.
Claim 3
Dependent Claim
12 words
A process as claimed in claim 1, wherein the 1-olefin is propylene.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1, wherein the catalyst consists essentially of said metallocene and said alumoxane.
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |