US4078003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of 1,3-diamino-2,2-dimethyl propane
Assignee: Hoechst AG
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Filing: 1976-09-14
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Granted: 1978-03-07
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Expires: 1996-09-14
Abstract
Abstract A method for preparing neopentane diamine is disclosed comprising reacting neopentane glycol with ammonia in the presence of hydrogen and a nickel containing catalyst at elevated temperatures and pressures. Neopentane diamine is useful as an intermediate in the preparation of polyurethanes.
Inventors
- 👤 Hans Feichtinger
- 👤 Heinz Aschmann
- 👤 Hans-Walter Birnkraut
- 👤 Ludwig Brinkmann
- 👤 Werner Pluta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:32
CPC Classifications
C; C07; C07C; C07C211/00; C07C211/01; C07C211/02; C07C211/09; C07C211/11; C07C209/00; C07C209/04; C07C209/14; C07C209/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A process for the production of 1,3 diamino-2,2 dimethyl propane comprising contacting neopentyl glycol, ammonia and hydrogen at a temperature of 150° - 300° C. and a pressure of at least 10 atmospheres in the presence of a nickel catalyst on a carrier, said catalyst containing 23 to 60% by weight of nickel and 16 to 40% by weight of chromium, and the hydroxyl group to ammonia ratio is 1:6 to 1:20.
Claim 2
Dependent Claim
72 words
A process for the production of 1,3 diamino-2,2 dimethyl propane comprising contacting neopentyl glycol, ammonia and hydrogen at a temperature of 150° - 300° C. and a pressure of at least 10 atmospheres in the presence of a nickel catalyst on a carrier, said catalyst containing 23 to 60% by weight of nickel and 16 to 40% by weight of chromium, and the hydroxyl group to ammonia ratio is 1:6 to 1:20.
Claim 3
Dependent Claim
14 words
The process according to claim 1 wherein said temperature is 240° to 260° C.
Claim 4
Dependent Claim
19 words
The process according to claim 1 wherein the chromium is in the form of Cr 2 O 3 .
References Cited (Backward Citations)
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US3347926A
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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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |