US4003938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of aliphatic isocyanates
Assignee: BASF SE
•
Filing: 1976-03-04
•
Granted: 1977-01-18
•
Expires: 1996-03-04
Abstract
Abstract Aliphatic isocyanates are produced by thermal decomposition of the corresponding beta -naphthyl carbamates.
Inventors
- 👤 Karl-Heinz Koenig
- 👤 Siegfried Kersten
- 👤 Christian Reitel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:07
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A process for the manufacture of aliphatic isocyanates of the general formula I r -- n = c = o i in which R denotes straight-chain or branched-chain alkyl of from 1 to 10 carbon atoms or alkenyl of from 2 to 6 carbon atoms, wherein β-naphthyl carbamates of the general formula II ##STR2##in which R has the meanings stated above, are thermally decomposed at a temperature of from 150° to 500° C.
Claim 2
Dependent Claim
73 words
A process for the manufacture of aliphatic isocyanates of the general formula I r -- n = c = o i in which R denotes straight-chain or branched-chain alkyl of from 1 to 10 carbon atoms or alkenyl of from 2 to 6 carbon atoms, wherein β-naphthyl carbamates of the general formula II ##STR2##in which R has the meanings stated above, are thermally decomposed at a temperature of from 150° to 500° C.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1, wherein the thermal decomposition is carried out at a temperature of from 200° to 350° C.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1, wherein the thermal decomposition is carried out at a pressure of from 1 to 200 mm of Hg.
References Cited (Backward Citations)
US3734941A
Cited
US3919280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |