US4841004A
Expired / Lapsed
US
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Process for the preparation of a 1-olefin stereoblock polymer
Assignee: Targor GmbH
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Filing: 1987-11-25
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Granted: 1989-06-20
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Expires: 2007-11-25
Abstract
Abstract Stereoblock polymers of 1-olefins having long isotactic sequences are obtained at industrially favorable polymerization temperatures using a catalyst which comprises a metallocene compound having cyclopentadienyl radicals which are substituted by chiral groups, and an alumoxane.
Inventors
- 👤 Walter Kaminsky
- 👤 Maria Buschermohle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:59
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592; C08F4/65922; C08F4/65925; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
148 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 a transition metal compound and an alumoxane, wherein the polymerization is carried out in the presence of a catalyst whose transition metal compound is bis-neomenthylcyclopentadienyl zirconium dichloride, and where the alumoxane is one of the formula II Al.sub.2 OR.sub.4.sup.5 [Al (R.sup.5)-O].sub.n (II) for the linear type and/or one of the formula III [Al (R.sup.5)-O].sub.n+2 (III) for the cyclic type, where, in the formulae II and III, R 5 denotes methyl, ethyl or isobutyl, and n is an integer from 4 to 20.
Claim 2
Dependent Claim
148 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 a transition metal compound and an alumoxane, wherein the polymerization is carried out in the presence of a catalyst whose transition metal compound is bis-neomenthylcyclopentadienyl zirconium dichloride, and where the alumoxane is one of the formula II Al.sub.2 OR.sub.4.sup.5 [Al (R.sup.5)-O].sub.n (II) for the linear type and/or one of the formula III [Al (R.sup.5)-O].sub.n+2 (III) for the cyclic type, where, in the formulae II and III, R 5 denotes methyl, ethyl or isobutyl, and n is an integer from 4 to 20.
Claim 3
Dependent Claim
12 words
The process as claimed in claim 1, wherein the 1-olefin is propylene.
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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |