US3137683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1, 2-isotactic polybutadiene and process for producing the same
Assignee: Montedison SpA
•
Filing: 1957-04-09
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Granted: 1964-06-16
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Expires: 1977-04-09
Abstract
No abstract record available.
Inventors
- 👤 Natta Giulio
- 👤 Porri Lido
- 👤 Palvarini Attilio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:04
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
AS A NEW PRODUCT, ISOTACTIC POLYBUTADIENE.
Claim 2
Dependent Claim
6 words
AS A NEW PRODUCT, ISOTACTIC POLYBUTADIENE.
Claim 3
Dependent Claim
80 words
A PROCESS FOR PRODUCING SOLID, LINEAR, BUTADIENE HOMOPOLYMERS CHARACTERIZED IN THAT THE UNITS DERIVED FROM THE MONOMER HAVE PREVAILINGLY A 1,2-ENCHAINMENT AND THE MACROMOLECULES THEREOF SHOW ISOTACTIC STRUCTURE AND EXHIBIT ISOTACTIC TYPE CRYSTALLINITY AT THE X-RAYS, WHICH PROCESS COMPRISES POLYMERIZING BUTADIENE AT A TEMPERATUBE BETWEEN -80*C. AND +150*C., UNDER A PRESSURE OF FROM NORMAL ATMOSPHERIC PRESSURE TO ABOUT 10 ATMOSPHERES, AND IN CONTACT WITH A CATALYST OBTAINED BY MIXING TRIETHYL ALUMINUM WITH A COMPLEX CHROMIUM COMPOUND HAVING THE GENERAL FORMULA
Claim 4
Dependent Claim
80 words
A PROCESS FOR PRODUCING SOLID, LINEAR, BUTADIENE HOMOPOLYMERS CHARACTERIZED IN THAT THE UNITS DERIVED FROM THE MONOMER HAVE PREVAILINGLY A 1,2-ENCHAINMENT AND THE MACROMOLECULES THEREOF SHOW ISOTACTIC STRUCTURE AND EXHIBIT ISOTACTIC TYPE CRYSTALLINITY AT THE X-RAYS, WHICH PROCESS COMPRISES POLYMERIZING BUTADIENE AT A TEMPERATUBE BETWEEN -80*C. AND +150*C., UNDER A PRESSURE OF FROM NORMAL ATMOSPHERIC PRESSURE TO ABOUT 10 ATMOSPHERES, AND IN CONTACT WITH A CATALYST OBTAINED BY MIXING TRIETHYL ALUMINUM WITH A COMPLEX CHROMIUM COMPOUND HAVING THE GENERAL FORMULA
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |