Patent US2905646A successfully refreshed from Google Patents.
US2905646A
Expired / Lapsed
US
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Catalysts for the polymerization of olefines and process for preparing said catalysts
Assignee: Montedison SpA
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Filing: 1956-07-13
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Granted: 1959-09-22
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Expires: 1976-07-13
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Longi Paolo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:50
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07F; C07F5/00; C07F5/06; C07F7/00; C07F7/28; C08F110/00; C08F110/02; C08F110/04; C08F110/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A CATALYST FOR THE POLYMERIZATION OF OLEFINS TO SUBSTANTIALLY LINEAR HIGH POLYMERS OF REGULAR STRUCTURE, SAID CATALYST BEING AN ORGANOMETALLIC COMPOUND CONTAINING DIRECT METAL-TO-CARBON BONDS AND OBTAINED BY CONTACTING AN ALLOY OF THE METALS TITANIUM AND ALUMINUM IN A RATIO OF 1:1 TO 1:10 WITH AN EXCESS OF A PRIMARY ALKYL HALIDE RX WHEREIN R IS AN ALKYL RADICAL CONTAINING 2 TO 18 CARBON ATOMS AND X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, AT A TEMPERATURE BETWEEN 20* C. AND 100* C, UNTIL THERE IS PRODUCED AN ORGANOMETALLIC COMPOUND CONTAINING DIRECT METAL-TO-CARBON BONDS AND IN WHICH THE TITANIUM IS OXIDIZED FROM ZERO VALENCE TO HIGHER VALENCE, AND THEN REMOVING THE UNREACTED ALKYL HALIDE.
Claim 2
Dependent Claim
117 words
A CATALYST FOR THE POLYMERIZATION OF OLEFINS TO SUBSTANTIALLY LINEAR HIGH POLYMERS OF REGULAR STRUCTURE, SAID CATALYST BEING AN ORGANOMETALLIC COMPOUND CONTAINING DIRECT METAL-TO-CARBON BONDS AND OBTAINED BY CONTACTING AN ALLOY OF THE METALS TITANIUM AND ALUMINUM IN A RATIO OF 1:1 TO 1:10 WITH AN EXCESS OF A PRIMARY ALKYL HALIDE RX WHEREIN R IS AN ALKYL RADICAL CONTAINING 2 TO 18 CARBON ATOMS AND X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE, AT A TEMPERATURE BETWEEN 20* C. AND 100* C, UNTIL THERE IS PRODUCED AN ORGANOMETALLIC COMPOUND CONTAINING DIRECT METAL-TO-CARBON BONDS AND IN WHICH THE TITANIUM IS OXIDIZED FROM ZERO VALENCE TO HIGHER VALENCE, AND THEN REMOVING THE UNREACTED ALKYL HALIDE.
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) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |