Patent US3305538A successfully refreshed from Google Patents.
US3305538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: Montedison SpA
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Filing: 1962-11-20
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Granted: 1967-02-21
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Expires: 1982-11-20
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Zambelli Adolfo
- 👤 Pasquon Italo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:58
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/04; C08F10/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
A PROCESS FOR PREPARING POLYPROPYLENE SHOWING CRYSTALLINITY AT THE X-RAYS, THE CRYSTALLINITY RESULTING SUBSTANTIALLY EXCLUSIVELY FROM THE SYNDIOTACTIC STRUCTURE, WHICH COMPRISES POLYMERIZING THE PROPYLENE AT A TEMPERATURE BELOW 0*C. IN THE PRESENCE OF A CATALYTIC SYSTEM COMPRISING A HYDROCARBON SOLUBLE REACTION PRODUCT OBTAINED BY REACTING VANADIUM TRIACETYLACETONATE, A STRONG LEWIS BASE AND AN ORGANIC HALIDE ALUMINUM COMPOUND OF THE FORMULA AIRX2 WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKYLARYL, AND CYCLOALKYL GROUPS HAVING UP TO 10 CARBON ATOMS AND X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND FLUORINE.
Claim 2
Dependent Claim
94 words
A PROCESS FOR PREPARING POLYPROPYLENE SHOWING CRYSTALLINITY AT THE X-RAYS, THE CRYSTALLINITY RESULTING SUBSTANTIALLY EXCLUSIVELY FROM THE SYNDIOTACTIC STRUCTURE, WHICH COMPRISES POLYMERIZING THE PROPYLENE AT A TEMPERATURE BELOW 0*C. IN THE PRESENCE OF A CATALYTIC SYSTEM COMPRISING A HYDROCARBON SOLUBLE REACTION PRODUCT OBTAINED BY REACTING VANADIUM TRIACETYLACETONATE, A STRONG LEWIS BASE AND AN ORGANIC HALIDE ALUMINUM COMPOUND OF THE FORMULA AIRX2 WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKYLARYL, AND CYCLOALKYL GROUPS HAVING UP TO 10 CARBON ATOMS AND X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND FLUORINE.
Claim 3
Dependent Claim
109 words
A PROCESS FOR PREPARING POLYPROPYLENE SHOWING CRYSTALLINITY AT THE X-RAYS, THE CRYSTALLINITY RESULTING SUBSTANTIALLY EXCLUSIVELY FROM THE SYNDIOTACTIC STRUCTURE WHICH COMPRISES POLYMERIZING THE PROPYLENE AT A TEMPERATURE BELOW 0*C. IN THE PRESENCE OF A CATALYTIC SYSTEM COMPRISING A HYDROCARBON SOLUBLE REACTION PRODUCT OBTAINED BY REACTING VANADIUM TRIACETYLACETONATE AND AN ORGANIC HALIDE ALUMINUM COMPOUND OF THE FORMULA AL2R3X3 WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL AND ALKYLARYL AND CYCLOALKYL GROUPS HAVING UP TO 10 CARBON ATOMS AND X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND FLUORINE WHEREIN THE ALUMINUM TO VANADIUM ATOMIC RATIO IS AT LEAST 5, IN THE ABSENCE OF A LEWIS BASE.
Claim 4
Dependent Claim
109 words
A PROCESS FOR PREPARING POLYPROPYLENE SHOWING CRYSTALLINITY AT THE X-RAYS, THE CRYSTALLINITY RESULTING SUBSTANTIALLY EXCLUSIVELY FROM THE SYNDIOTACTIC STRUCTURE WHICH COMPRISES POLYMERIZING THE PROPYLENE AT A TEMPERATURE BELOW 0*C. IN THE PRESENCE OF A CATALYTIC SYSTEM COMPRISING A HYDROCARBON SOLUBLE REACTION PRODUCT OBTAINED BY REACTING VANADIUM TRIACETYLACETONATE AND AN ORGANIC HALIDE ALUMINUM COMPOUND OF THE FORMULA AL2R3X3 WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL AND ALKYLARYL AND CYCLOALKYL GROUPS HAVING UP TO 10 CARBON ATOMS AND X IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND FLUORINE WHEREIN THE ALUMINUM TO VANADIUM ATOMIC RATIO IS AT LEAST 5, IN THE ABSENCE OF A LEWIS BASE.
Claim 5
Dependent Claim
145 words
A PROCESS OF PREPARING POLYPROPYLENE SHOWING CRYSTALLINITY AT THE X-RAYS, THE CRYSTALLINITY RESULTING EXCLUSIVELY FROMT HE SYNDIOTACTIC STRUCTURE WHICH COMPRISES POLYMERIZING THE PROPYLENE AT A TEMPERATURE BELOW 0*C. IN THE PRESENCE OF A CATALYTIC SYSTEM COMPRISING A HYDROCARBON SOLUBLE REACTION PRODUCT OBTAINED BY REACTING A HALOGENATED VANADIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF VCL4 AND VF5 AND AN ALUMINUM ORGANIC HALIDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF AIR''R"X AND AL2R''3X3 WHEREIN R'' AND R" ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKYLARYL AND CYCLOALKYL GROUPS HAVING UP TO 10 CARBON ATOMS AND X IS THE SAME HALOGEN AS IN THE HALOGENATED VANADIUM COMPOUND AND IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND FLUORINE, IN THE PRESENCE OF A WEAK LEWIS BASE WHICH HAS A HEAT OF COMPLEXATION WITH THE METALORGANIC HALIDE COMPOUND BELOW 12,000 CALORIES PER MOLE OF METALORGANIC COMPOUND.
Claim 6
Dependent Claim
145 words
A PROCESS OF PREPARING POLYPROPYLENE SHOWING CRYSTALLINITY AT THE X-RAYS, THE CRYSTALLINITY RESULTING EXCLUSIVELY FROMT HE SYNDIOTACTIC STRUCTURE WHICH COMPRISES POLYMERIZING THE PROPYLENE AT A TEMPERATURE BELOW 0*C. IN THE PRESENCE OF A CATALYTIC SYSTEM COMPRISING A HYDROCARBON SOLUBLE REACTION PRODUCT OBTAINED BY REACTING A HALOGENATED VANADIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF VCL4 AND VF5 AND AN ALUMINUM ORGANIC HALIDE COMPOUND SELECTED FROM THE GROUP CONSISTING OF AIR''R"X AND AL2R''3X3 WHEREIN R'' AND R" ARE SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKYLARYL AND CYCLOALKYL GROUPS HAVING UP TO 10 CARBON ATOMS AND X IS THE SAME HALOGEN AS IN THE HALOGENATED VANADIUM COMPOUND AND IS SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND FLUORINE, IN THE PRESENCE OF A WEAK LEWIS BASE WHICH HAS A HEAT OF COMPLEXATION WITH THE METALORGANIC HALIDE COMPOUND BELOW 12,000 CALORIES PER MOLE OF METALORGANIC COMPOUND.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |