Patent US2885001A successfully refreshed from Google Patents.
US3344162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aromatic polyisocyanates
Assignee: Texaco Inc
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Filing: 1964-01-02
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Granted: 1967-09-26
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Expires: 1984-01-02
Abstract
No abstract record available.
Inventors
- 👤 Richard L Rowton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:14
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
IN A METHOD FOR THE PREPARATION OF A POLYISOCYANATE REACTION PRODUCT FROM A MIXTURE OF AROMATIC AMINES, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF ADDING A CHLORINATED AROMATIC HYDROCARBON SOLVENT SOLUTION OF SAID AROMATIC AMINE MIXTURE TO A CHLORINATED AROMATIC HYDROCARBON SOLVENT SOLUTION OF PHOSGENE AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 25* TO ABOUT 50*C. IN AN AMOUNT SUFFICIENT TO PROVIDE FROM ABOUT 4 TO 5 MOL EQUIVALENTS OF PHOSGENE IN THE MIXTURE, BASED ON SAID AROMATIC AMINE, AND A TOTAL AMOUNT OF SOLVENT SUFFICIENT TO PROVIDE ABOUT A 6 TO 9 WT. PERCENT SOLUTION OF SAID AROMATIC AMINE; THEREAFTER HEATING THE RESULTANT SLURRY IN LIQUID PHASE AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 75* TO ABOUT 150*C. WHILE ADDING AN ADDITIONAL 1 TO 3 MOL EQUIVALENTS OF PHOSGENE, BASED ON THE SAID AROMATIC AMINE AND THEREAFTER HEATING SAID MIXTURE WITHIN SAID TEMPERATURE RANGE FOR A PERIOD OF TIME SUFFICIENT TO PROVIDE A CLEAR SOLUTION AND THEREAFTER TERMINATING THE REACTION AND REMOVING THE SOLVENT FROM THE REACTION MIXTURE TO THEREBY PROVIDE SAID POLYISOCYANATE COMPOSITION, SAID AROMATIC AMINES HAVING THE FORMULAE:
Claim 2
Dependent Claim
185 words
IN A METHOD FOR THE PREPARATION OF A POLYISOCYANATE REACTION PRODUCT FROM A MIXTURE OF AROMATIC AMINES, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF ADDING A CHLORINATED AROMATIC HYDROCARBON SOLVENT SOLUTION OF SAID AROMATIC AMINE MIXTURE TO A CHLORINATED AROMATIC HYDROCARBON SOLVENT SOLUTION OF PHOSGENE AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 25* TO ABOUT 50*C. IN AN AMOUNT SUFFICIENT TO PROVIDE FROM ABOUT 4 TO 5 MOL EQUIVALENTS OF PHOSGENE IN THE MIXTURE, BASED ON SAID AROMATIC AMINE, AND A TOTAL AMOUNT OF SOLVENT SUFFICIENT TO PROVIDE ABOUT A 6 TO 9 WT. PERCENT SOLUTION OF SAID AROMATIC AMINE; THEREAFTER HEATING THE RESULTANT SLURRY IN LIQUID PHASE AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 75* TO ABOUT 150*C. WHILE ADDING AN ADDITIONAL 1 TO 3 MOL EQUIVALENTS OF PHOSGENE, BASED ON THE SAID AROMATIC AMINE AND THEREAFTER HEATING SAID MIXTURE WITHIN SAID TEMPERATURE RANGE FOR A PERIOD OF TIME SUFFICIENT TO PROVIDE A CLEAR SOLUTION AND THEREAFTER TERMINATING THE REACTION AND REMOVING THE SOLVENT FROM THE REACTION MIXTURE TO THEREBY PROVIDE SAID POLYISOCYANATE COMPOSITION, SAID AROMATIC AMINES HAVING THE FORMULAE:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |