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US4036880A
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Method of preparing polyaminopolyphenylmethanes
Assignee: Huntsman Corp
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Filing: 1976-09-15
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Granted: 1977-07-19
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Expires: 1996-09-15
Abstract
Abstract Covers a method of preparing diaminodiphenylmethanes and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a molybdenum boride catalyst.
Inventors
- 👤 Edward T. Marquis
- 👤 Robert M. Gipson
- 👤 Lewis W. Watts, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:12
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/30; C; C07; C07C; C07C209/00; C07C209/68; C07C209/78; C07C211/00; C07C211/43; C07C211/44; C07C211/49; C07C211/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
A method of preparing diaminodiphenylmethane and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a molybdenum boride catalyst.
Claim 2
Independent Claim
26 words
A method of preparing diaminodiphenylmethane and higher homologues thereof which comprises the step of condensing aniline and formaldehyde in the presence of a molybdenum boride catalyst.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said catalyst is present in an amount ranging from about 0.5 to about 3.0% by weight based on the weight of aniline present.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein said catalyst is present in an amount of 1-2% by weight.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein said catalyst is selected from the group consisting of molybdenum boride, molybdenum diboride, dimolybdenum monoboride, and dimolybdenum pentaboride.
References Cited (Backward Citations)
US3362979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |