Patent US3300467A successfully refreshed from Google Patents.
US3300467A
Expired / Lapsed
US
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Production of crystalline isotactic cis-1, 4-polypentadiene with a ti (or)4-air3 catalyst
Assignee: Montedison SpA
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Filing: 1963-02-11
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Granted: 1967-01-24
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Expires: 1983-02-11
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Porri Lido
- 👤 Stoppa Gianfranco
- 👤 Carbonaro Antonio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:14
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F136/00; C08F136/02; C08F136/04; C08F136/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A PROCESS FOR PREPARING CIS-1,4 UNSUBSTITUTED POLYPENTADIENES IN WHICH ESSENTIALLY ALL THE CIS-1,4 UNITS HAVE AN ISOTACTIC CONFIGURATION AND WHICH SHOW AT THE X-RAYS CRYSTALLINITY DUE EXCLUSIVELY TO ISOTACTIC STRUCTURE WHICH COMPRISES HOMOPOLYMERIZING 1,3-PENTADIENE IN THE PRESENCE OF A CATALYST OBTAINED FROM (A) A TITANIUM COMPOUND HAVING THE GENERAL FORMULA: TI(-O-R)4 WHEREIN R REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKYLARYL AND CYCLOALKYL GROUPS AND (B) AN ORGANO ALUMINUM COMPOUND HAVING THE FORMULA: R1-AL(-R2)-R3 WHEREIN R2 AND R3 EACH REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKYL, ALKYLARYL AND CYCLOALKYL GROUPS AND R1 REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ATOMS, ALKYL, ALKYLARYL AND CYCLOALKYL GROUPS.
Claim 2
Dependent Claim
115 words
A PROCESS FOR PREPARING CIS-1,4 UNSUBSTITUTED POLYPENTADIENES IN WHICH ESSENTIALLY ALL THE CIS-1,4 UNITS HAVE AN ISOTACTIC CONFIGURATION AND WHICH SHOW AT THE X-RAYS CRYSTALLINITY DUE EXCLUSIVELY TO ISOTACTIC STRUCTURE WHICH COMPRISES HOMOPOLYMERIZING 1,3-PENTADIENE IN THE PRESENCE OF A CATALYST OBTAINED FROM (A) A TITANIUM COMPOUND HAVING THE GENERAL FORMULA: TI(-O-R)4 WHEREIN R REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKYLARYL AND CYCLOALKYL GROUPS AND (B) AN ORGANO ALUMINUM COMPOUND HAVING THE FORMULA: R1-AL(-R2)-R3 WHEREIN R2 AND R3 EACH REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF ALKYL, ALKYLARYL AND CYCLOALKYL GROUPS AND R1 REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN ATOMS, ALKYL, ALKYLARYL AND CYCLOALKYL GROUPS.
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) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |