Patent US3676418A successfully refreshed from Google Patents.
US3676418A
Expired / Lapsed
US
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Catalytic production of olefin polymers
Assignee: Mitsubishi Chemical Corp
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Filing: 1969-07-16
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Granted: 1972-07-11
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Expires: 1989-07-16
Abstract
Abstract A Ziegler-type polymerization catalyst comprising a first catalyst component containing a transition metal compound and a second catalyst component containing an organometallic compound, which first catalyst component contains a silicon compound. Preparation of the first catalyst component and production of olefin polymers are also disclosed.
Inventors
- 👤 Kijuro Tashiro
- 👤 Masuzo Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:45
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/907
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
A process for producing an olefin polymer as claimed in claim 1 wherein said organoaluminum compound b is represented by the general formula AlR2Z3 n, R being a lower alkyl group and n being 1, 1.5, 2, or 3 and Z is chlorine.
Claim 2
Dependent Claim
44 words
A process for producing an olefin polymer as claimed in claim 1 wherein said silicon compound c is represented by the general formula SiXnY4 n, Y being a lower alkyl group and n being a number from 0 to 4 and X is chlorine.
Claim 3
Dependent Claim
19 words
A process for producing an olefin polymer as claimed in claim 3 wherein said silicon compound c is SiCl4.
Claim 4
Dependent Claim
27 words
A process for producing an olefin polymer as claimed in claim 1 wherein Z in the formula AlRnZ3 n set forth for organo-aluminum compound (II) represents chlorine.
Claim 5
Dependent Claim
49 words
A process for producing an olefin polymer as claimed in claim 1 which includes the step of heating the solid reaction product (I) to a temperature in the range of from 60* to 200* C for at least 1 hour bEfore it is combined with said organoaluminum compound (II).
References Cited (Backward Citations)
GB828201A
Cited
US3058970A
Cited
US2920062A
Cited
US3173901A
Cited
GB954609A
Cited
US3271376A
Cited
US3440179A
Cited
US3328375A
Cited
FR1490233A
Cited
US3506591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |