Patent US2901470A successfully refreshed from Google Patents.
US2901470A
Expired / Lapsed
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Process of preparing linear polymers of multivinyl aromatic compounds
Assignee: EIDP Inc
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Filing: 1954-11-22
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Granted: 1959-08-25
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Expires: 1974-11-22
Abstract
No abstract record available.
Inventors
- 👤 Gresham William Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:29
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR PREPARING LINEAR POLYMERS OF MULTIVINYL AROMATIC HYDROCARBON COMPOUNDS COMPRISING SUBJECTING A MONOMERIC, VINYL AROMATIC HYDROCARBON COMPOUND, HAVING 2-3 VINYL GROUPS PER MOLECULE AND BEING SELECTED FROM THE GROUP CONSISTING OF UNSUBSTITUTED VINYL AROMATIC HYDROCARBONS, TO POLYMERIZATION CONDITIONS COMPRISING A PRESSURE OF 1-200 ATMOSPHERES AND A TEMPERATURE OF 0*-300 C. IN THE PRESENCE OF A MIXTURE OF TITANITURE OF 0*-300* C.IN THE PRESENCE OF A MIXTURE OF TITANIUM TETRAHALIDE AND A REDUCING AGENT HAVING AT LEAST ONE METAL-TO-HYDROCARBON BOND, SAID REDUCING AGENT BEING PRESENT IN AN AMOUNT SUFFICIENT TO CAUSE THE AVERAGE VALENCE OF ALL OF THE SAID TITANIUM TO BE REDUCED TO LESS THAN 3, AND RECOVERING A LINEAR POLYMER OF SAID VINYL AROMATIC HYDROCARBON COMPOUND.
Claim 2
Dependent Claim
119 words
A PROCESS FOR PREPARING LINEAR POLYMERS OF MULTIVINYL AROMATIC HYDROCARBON COMPOUNDS COMPRISING SUBJECTING A MONOMERIC, VINYL AROMATIC HYDROCARBON COMPOUND, HAVING 2-3 VINYL GROUPS PER MOLECULE AND BEING SELECTED FROM THE GROUP CONSISTING OF UNSUBSTITUTED VINYL AROMATIC HYDROCARBONS, TO POLYMERIZATION CONDITIONS COMPRISING A PRESSURE OF 1-200 ATMOSPHERES AND A TEMPERATURE OF 0*-300 C. IN THE PRESENCE OF A MIXTURE OF TITANITURE OF 0*-300* C.IN THE PRESENCE OF A MIXTURE OF TITANIUM TETRAHALIDE AND A REDUCING AGENT HAVING AT LEAST ONE METAL-TO-HYDROCARBON BOND, SAID REDUCING AGENT BEING PRESENT IN AN AMOUNT SUFFICIENT TO CAUSE THE AVERAGE VALENCE OF ALL OF THE SAID TITANIUM TO BE REDUCED TO LESS THAN 3, AND RECOVERING A LINEAR POLYMER OF SAID VINYL AROMATIC HYDROCARBON COMPOUND.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |