US3335121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: Montedison SpA
•
Filing: 1963-07-03
•
Granted: 1967-08-08
•
Expires: 1983-07-03
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Pasquon Italo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:01
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/04; C08F10/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR PREPARING POLYPROPLENE SHOWING CRYSTALLINITY DUE SUBSTANTIALLY ONLY TO THE EXISTENCE OF THE STEREOREGULAR STRUCTURE SYNDIOTACTIC IN THE MACRONMOLECULES THEREOF, WHICH PROCESS COMPRISES POLYMERIZING PROPYLENE, AT A TEMPERATURE BELOW 0*C., IN INERT AROMATIC HYDROCARBON SOLVENT, AND IN CONTACT WITH A HOMOGENEOUS CATALYST WHICH IS THE AROMATIC HYDROCARBON-SOLUBLE PRODUCT OF THE REACTION, AT A TEMPERATURE BELOW 0* C., OF VANADIUM TRIACETYLACETONATE, AN ORGANOMETALLIC ALUMINUM MONOHALIDE OF THE FORMULA AIR''R"X IN WHICH R'' AND R" ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKYLARYL, AND CYCLOALKYL GROUPS CONTAINING UP TO 10 CARBON ATOMS AND X IS A HALOGEN ATOM, IN A MOLAR RATIO OF THE VANADIUM TRIACETYLACETONATE TO ORGANOMETALLIC ALUMINUM MONOHALIDE OF 1:15, AND OF A LEWIS BASE HAVING A HEAT OF COMPLEXATION WITH THE ORGANOMETALLIC ALUMINUM HALIDE LOWER THAN 12,000 CAL. PER MOLE OF SAID HALIDE.
Claim 2
Dependent Claim
138 words
A PROCESS FOR PREPARING POLYPROPLENE SHOWING CRYSTALLINITY DUE SUBSTANTIALLY ONLY TO THE EXISTENCE OF THE STEREOREGULAR STRUCTURE SYNDIOTACTIC IN THE MACRONMOLECULES THEREOF, WHICH PROCESS COMPRISES POLYMERIZING PROPYLENE, AT A TEMPERATURE BELOW 0*C., IN INERT AROMATIC HYDROCARBON SOLVENT, AND IN CONTACT WITH A HOMOGENEOUS CATALYST WHICH IS THE AROMATIC HYDROCARBON-SOLUBLE PRODUCT OF THE REACTION, AT A TEMPERATURE BELOW 0* C., OF VANADIUM TRIACETYLACETONATE, AN ORGANOMETALLIC ALUMINUM MONOHALIDE OF THE FORMULA AIR''R"X IN WHICH R'' AND R" ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKYLARYL, AND CYCLOALKYL GROUPS CONTAINING UP TO 10 CARBON ATOMS AND X IS A HALOGEN ATOM, IN A MOLAR RATIO OF THE VANADIUM TRIACETYLACETONATE TO ORGANOMETALLIC ALUMINUM MONOHALIDE OF 1:15, AND OF A LEWIS BASE HAVING A HEAT OF COMPLEXATION WITH THE ORGANOMETALLIC ALUMINUM HALIDE LOWER THAN 12,000 CAL. PER MOLE OF SAID HALIDE.
References Cited (Backward Citations)
US3258455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |