US2865940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing saturated aliphatic diisocyanates
Assignee: Millennium Petrochemicals Inc
•
Filing: 1954-12-14
•
Granted: 1958-12-23
•
Expires: 1974-12-14
Abstract
No abstract record available.
Inventors
- 👤 John F Nobis
- 👤 Greenberg Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:22
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
THE METHOD OF PREPARING SATURATED ALIPHATIC C8 DIISOCYANATES IN WHICH THE ISOCYANO (-NCO) GROUPS ARE SEPARATED BY AT LEAST 4 CARBON ATOMS, WHICH INCLUDES STEPS OF DIMERIZING BUTADIENE IN THE PRESENCE OF SODIUM IN FINELY DISPERSED FORM IN AN ACTIVE ETHER DIULENT AND IN THE PRESENCE OF AT LEAST ONE DIMERIZATION ACTIVATOR, IMMEDIATELY CARBONATING THE RESULTING ORGANOMETALLIC DIENE INTERMEDIATE, NEUTRALIZING THE RESULTING DIALKALI METAL SALTS OF DICARBOXYLIC ACIDS TO OBTAIN THE FREE DIACIDS, HYDROGENATING THE UNSATURATED DIACIDS, REACTING THE SATURATED DIACIDS WITH AT LEAST ONE AMMONIA RELEASING AGENT TO OBTAIN THE DIAMIDES, TREATING THE DIAMIDES, WITH ALKALINE HYPOHALITE TO GIVE THE DIAMINES, THE REACTING THE DIAMINES WITH PHOSGENE TO OBTAIN THE C8 DIISOCYANATES.
Claim 2
Independent Claim
113 words
THE METHOD OF PREPARING SATURATED ALIPHATIC C8 DIISOCYANATES IN WHICH THE ISOCYANO (-NCO) GROUPS ARE SEPARATED BY AT LEAST 4 CARBON ATOMS, WHICH INCLUDES STEPS OF DIMERIZING BUTADIENE IN THE PRESENCE OF SODIUM IN FINELY DISPERSED FORM IN AN ACTIVE ETHER DIULENT AND IN THE PRESENCE OF AT LEAST ONE DIMERIZATION ACTIVATOR, IMMEDIATELY CARBONATING THE RESULTING ORGANOMETALLIC DIENE INTERMEDIATE, NEUTRALIZING THE RESULTING DIALKALI METAL SALTS OF DICARBOXYLIC ACIDS TO OBTAIN THE FREE DIACIDS, HYDROGENATING THE UNSATURATED DIACIDS, REACTING THE SATURATED DIACIDS WITH AT LEAST ONE AMMONIA RELEASING AGENT TO OBTAIN THE DIAMIDES, TREATING THE DIAMIDES, WITH ALKALINE HYPOHALITE TO GIVE THE DIAMINES, THE REACTING THE DIAMINES WITH PHOSGENE TO OBTAIN THE C8 DIISOCYANATES.
References Cited (Backward Citations)
US2132849A
Cited
US2319057A
Cited
US2200282A
Cited
US2352461A
Cited
US2394597A
Cited
US2584527A
Cited
US2716662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |