US3258455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene having syndiotactic structure
Assignee: Montedison SpA
•
Filing: 1960-06-06
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Granted: 1966-06-28
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Expires: 1980-06-06
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Corradini Paolo
- 👤 Pasquon Italo
- 👤 Pegoraro Mario
- 👤 Peraldo Mario
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:16
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A PROCESS FOR POLYMERIZING PROPYLENE TO CRUDE POLYPROPYLENE SHOWING CRYSTALINITY EXCLUSIVELY OF SYNDIOTACTIC TYPE AT THE X-RAYS AND CHARACTERIZED BY AN INFRARED SPECTRUM SHOWING BANDS AT 7.62; 7.91; 9.95; 11.53 AND 12.3 MICRONS, WHICH BANDS ARE DICHROIC IN THE ORIENTED POLYPROPYLENE, AN X-RAY FIBER DIFFRACTION DIAGRAM SHOWING REFLECTIONS CORRESPONDING TO LATTICE DISTANCES OF ABOUT 7.2; 5.3 AND 3.6 A. (EQUATORIAL REFLECTIONS) AND 4.3 A. (FIRST LAYER), AND BY AN INDENTITY PERIOD ALONG THE CHAIN AXIS OF ABOUT 7.4 A., SAID PROCESS COMPRISING POLYMERIZING PROPYLENE IN CONTACT WITH A VANDAIUM ACETYL-ACETONATE -ALXR1R2 CATALYST SYSTEM, IN WHICH X REPRESENTS A HALOGEN ATOM AND R1 AND R2 ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL-, ARYLALKYL-AND CYCLOALKYL-HYDROCARBON RADICALS CONTAINING UP TO 10 CARBON ATOMS, AT A TEMPERATURE BETWEEN -30* AND -100*C.
Claim 2
Dependent Claim
128 words
A PROCESS FOR POLYMERIZING PROPYLENE TO CRUDE POLYPROPYLENE SHOWING CRYSTALINITY EXCLUSIVELY OF SYNDIOTACTIC TYPE AT THE X-RAYS AND CHARACTERIZED BY AN INFRARED SPECTRUM SHOWING BANDS AT 7.62; 7.91; 9.95; 11.53 AND 12.3 MICRONS, WHICH BANDS ARE DICHROIC IN THE ORIENTED POLYPROPYLENE, AN X-RAY FIBER DIFFRACTION DIAGRAM SHOWING REFLECTIONS CORRESPONDING TO LATTICE DISTANCES OF ABOUT 7.2; 5.3 AND 3.6 A. (EQUATORIAL REFLECTIONS) AND 4.3 A. (FIRST LAYER), AND BY AN INDENTITY PERIOD ALONG THE CHAIN AXIS OF ABOUT 7.4 A., SAID PROCESS COMPRISING POLYMERIZING PROPYLENE IN CONTACT WITH A VANDAIUM ACETYL-ACETONATE -ALXR1R2 CATALYST SYSTEM, IN WHICH X REPRESENTS A HALOGEN ATOM AND R1 AND R2 ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL-, ARYLALKYL-AND CYCLOALKYL-HYDROCARBON RADICALS CONTAINING UP TO 10 CARBON ATOMS, AT A TEMPERATURE BETWEEN -30* AND -100*C.
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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |