US3210395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making toluene diisocyanate /x/cz e excejjx
Assignee: —
•
Filing: —
•
Granted: 1965-10-05
•
Expires: 1982-10-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:25
CPC Classifications
C; C07; C07C; C07C265/00; C07C265/14; C07C211/00; C07C211/43; C07C211/44; C07C211/49; C07C211/50; C07C263/00; C07C263/10; C07C263/18; C07C263/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A METHOD OF MAKING TOLUENE DIISOCYANATE COMPRISING PROVIDING A SOLUTION OF TOLUENE DIAMINE IN A SOLVENT CONSISTING OF CHLORINATED AROMATIC HYDROCARBON HAVING A BOILING POINT SUBSTANTIALLY IN EXCESS OF THE BOILING POINT OF TOLUENE DIISOCYANATE, SAID SOLUTION CONTAINING FROM 1% TO 15% BY WEIGHT OF SAID DIAMINE, INTRODUCING SAID SOLUTION INTO A REACTION VESSEL CONTAINING SAID SOLVENT, CONCURRENTLY INTRODUCING PHOSGENE AT SUCH A RATE AS TO PROVIDE FROM 3 TO 5 MOLES OF PHOSGENE FOR EACH MOLE OF TOLUENE DIAMINE, AGITATING THE LIQUID MIXTURE IN SAID REACTOR WHILE MAINTAINING IT AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF FROM 110*. TO 250*C. THROUGHOUT SAID INTRODUCTION OF SAID DIAMINE SOLUTION AND SAID PHOSGENE, WITHDRAWING FROM THE REACTOR A LIQUID MIXTURE CONTAINING TOLUENE DIISOCYANATE, THE SAID SOLVENT, AND BYPRODUCT TARS, FRACTINALLY DISTILLING THE MIXTURE TO REMOVE OVERHEAD THE TOLUENE DIISOCYANATE, LEAVING BEHIND A STILL RESIDUE CONTAINING THE SOLVENT AND BY-PRODUCT TARS, PASSING AMMONIA INTO THE SAID RESIDUE TO PRECIPITATE THE TARS, FILTERING THE MASS TO SEPARATE THE SOLVENT FROM THE TARS, AND RECYCLING THE SOLVENT TO THE START TO THE PROCESS.
Claim 2
Independent Claim
179 words
A METHOD OF MAKING TOLUENE DIISOCYANATE COMPRISING PROVIDING A SOLUTION OF TOLUENE DIAMINE IN A SOLVENT CONSISTING OF CHLORINATED AROMATIC HYDROCARBON HAVING A BOILING POINT SUBSTANTIALLY IN EXCESS OF THE BOILING POINT OF TOLUENE DIISOCYANATE, SAID SOLUTION CONTAINING FROM 1% TO 15% BY WEIGHT OF SAID DIAMINE, INTRODUCING SAID SOLUTION INTO A REACTION VESSEL CONTAINING SAID SOLVENT, CONCURRENTLY INTRODUCING PHOSGENE AT SUCH A RATE AS TO PROVIDE FROM 3 TO 5 MOLES OF PHOSGENE FOR EACH MOLE OF TOLUENE DIAMINE, AGITATING THE LIQUID MIXTURE IN SAID REACTOR WHILE MAINTAINING IT AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF FROM 110*. TO 250*C. THROUGHOUT SAID INTRODUCTION OF SAID DIAMINE SOLUTION AND SAID PHOSGENE, WITHDRAWING FROM THE REACTOR A LIQUID MIXTURE CONTAINING TOLUENE DIISOCYANATE, THE SAID SOLVENT, AND BYPRODUCT TARS, FRACTINALLY DISTILLING THE MIXTURE TO REMOVE OVERHEAD THE TOLUENE DIISOCYANATE, LEAVING BEHIND A STILL RESIDUE CONTAINING THE SOLVENT AND BY-PRODUCT TARS, PASSING AMMONIA INTO THE SAID RESIDUE TO PRECIPITATE THE TARS, FILTERING THE MASS TO SEPARATE THE SOLVENT FROM THE TARS, AND RECYCLING THE SOLVENT TO THE START TO THE PROCESS.
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |