US3257370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing alphaolefins
Assignee: Montedison SpA
•
Filing: 1962-01-26
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Granted: 1966-06-21
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Expires: 1982-01-26
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Longi Paolo
- 👤 Mazzanti Giorgio
- 👤 Roggero Arnaldo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:57
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR PRODUCING HIGH MOLECULAR WEIGHT LINEAR PROPYLENE POLYMERS WHICH, UPON FRACTIONATION BY SUCCESSIVE EXTRACTION WITH ETHYL ETHER, HEXANE AND HEPTANE AT THEIR BOILING EMPERATURES, SHOW THE PRESENCE OF A REGULAR SYNDIOTACTIC STRUCTURE IN ALL THE FRACTIONS CONTAINING CRYSTALLIZABLE MACROMOLECULES, WHICH PROCESS COMPRISES POLYMERIZING PROPYLENE AT A TEMPERATURE BETWEEN -100* AND +50*C. IN CONTACT WITH A CATALYST SYSTEM OBTAINED FROM (A) AN ALKYL COMPOUND OF SODIUM AND (B) A COMPOUND OF FORMULA TIX4, WHEREIN X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE ATOMS, COMPLEXED WITH A LEWIS ORGANIC BASE SELECTED FROM THE GROUP CONSISTING OF DIISOPROPYLETHER, ETHYLVINYLETHER, ISOPROPYLVINYLETHER, HEXADECYLVINYLETHER, ANISOLE, DIPHENNYLETHER, DIPHENYL SULFIDE, ACETONE, METHYLETHYLKETON,E ACETOPHENONE, BENZOPHENONE, METHYLACETAMIDE, PHENYLACETAMIDE, ACETANILIDE, PHENYLHYDROZINE, ASYMMETRIC DIPHENYLHYDRAZINE, AND SYMMETRICAL DIPHENYLHYDROZINE.
Claim 2
Dependent Claim
120 words
A PROCESS FOR PRODUCING HIGH MOLECULAR WEIGHT LINEAR PROPYLENE POLYMERS WHICH, UPON FRACTIONATION BY SUCCESSIVE EXTRACTION WITH ETHYL ETHER, HEXANE AND HEPTANE AT THEIR BOILING EMPERATURES, SHOW THE PRESENCE OF A REGULAR SYNDIOTACTIC STRUCTURE IN ALL THE FRACTIONS CONTAINING CRYSTALLIZABLE MACROMOLECULES, WHICH PROCESS COMPRISES POLYMERIZING PROPYLENE AT A TEMPERATURE BETWEEN -100* AND +50*C. IN CONTACT WITH A CATALYST SYSTEM OBTAINED FROM (A) AN ALKYL COMPOUND OF SODIUM AND (B) A COMPOUND OF FORMULA TIX4, WHEREIN X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND BROMINE ATOMS, COMPLEXED WITH A LEWIS ORGANIC BASE SELECTED FROM THE GROUP CONSISTING OF DIISOPROPYLETHER, ETHYLVINYLETHER, ISOPROPYLVINYLETHER, HEXADECYLVINYLETHER, ANISOLE, DIPHENNYLETHER, DIPHENYL SULFIDE, ACETONE, METHYLETHYLKETON,E ACETOPHENONE, BENZOPHENONE, METHYLACETAMIDE, PHENYLACETAMIDE, ACETANILIDE, PHENYLHYDROZINE, ASYMMETRIC DIPHENYLHYDRAZINE, AND SYMMETRICAL DIPHENYLHYDROZINE.
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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |