US4061856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trimerization of aromatic nitriles
Assignee: National Aeronautics and Space Administration
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Filing: 1974-10-10
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Granted: 1977-12-06
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Expires: 1994-10-10
Abstract
Abstract Triazine compounds and cross-linked polymer compositions are made by heating aromatic nitriles to a temperature in the range of from about 100 DEG 0 C. to about 700 DEG C., and preferably in the range of from about 200 DEG C. to about 350 DEG C. in the presence of a catalyst or mixture of catalysts selected from one or more of the following groups: (A) organic sulfonic and sulfinic acids, (B) organic phosphonic and phosphinic acids, and (C) metallic acetylacetonates, at a pressure in the range of from about atmospheric pressure to about 10,000 p.s.i., and preferably in the range of from about 200 p.s.i. to about 750 p.s.i.
Inventors
- 👤 Li-Chen Hsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:19
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; C07; C07D; C07D251/00; C07D251/02; C07D251/12; C07D251/14; C07D251/24; C08G73/0622; C08G73/0638; C08G73/065; C08G73/0655; C08G73/0661; C08G73/1003; C08G73/1067; C08G73/18; C08G73/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
A process for preparing an aromatic 1, 3, 5-triazine compound from an aromatic nitrile compound which comprises heating the aromatic nitrile compound to a temperature in the range of from about 100° C. to about 700° C. in the presence of a catalyst consisting essentially of a compound or mixture of compounds from at least one of the following groups: A. organic sulfonic and sulfinic acids, B. organic phosphonic and phosphinic acids, and C. metallic acetylacetonates, at a pressure in the range of from about atmospheric pressure to about 10,000 p.s.i.
Claim 2
Dependent Claim
91 words
A process for preparing an aromatic 1, 3, 5-triazine compound from an aromatic nitrile compound which comprises heating the aromatic nitrile compound to a temperature in the range of from about 100° C. to about 700° C. in the presence of a catalyst consisting essentially of a compound or mixture of compounds from at least one of the following groups: A. organic sulfonic and sulfinic acids, B. organic phosphonic and phosphinic acids, and C. metallic acetylacetonates, at a pressure in the range of from about atmospheric pressure to about 10,000 p.s.i.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the aromatic nitrile compound is heated to a temperature in the range of from about 100° C. to about 500° C.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the aromatic nitrile compound is heated to a temperature in the range of from about 200° C. to about 350° C.
Claim 5
Dependent Claim
21 words
The process of claim 1 conducted at a pressure in the range of from about 50 p.s.i. to about 1000 p.s.i.
Claim 6
Dependent Claim
21 words
The process of claim 1 conducted at a pressure in the range of from about 200 p.s.i. to about 750 p.s.i.
Claim 7
Dependent Claim
21 words
The process of claim 3 conducted at a pressure in the range of from about 50 p.s.i. to about 1000 p.s.i.
Claim 8
Dependent Claim
21 words
The process of claim 3 conducted at a pressure in the range of from about 200 p.s.i. to about 750 p.s.i.
Claim 9
Dependent Claim
28 words
The process of claim 1 wherein the aromatic nitrile compound is selected from the group consisting of meta-, ortho- and para-cyanobenzoic acid and their ester and halide derivatives.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein the aromatic nitrile compound is selected from the group consisting of meta-, ortho- and para-aminobenzonitrile.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein the aromatic nitrile compound is selected from the group consisting of 4-cyanophthalic anhydride and its ester and halide derivatives.
Claim 12
Dependent Claim
12 words
The process of claim 1 wherein the aromatic nitrile compound is 3,4-diaminobenzonitrile.
Claim 13
Dependent Claim
12 words
The process of claim 1 wherein the aromatic nitrile compound is 3,5-diaminobenzonitrile.
Claim 14
Dependent Claim
60 words
The process of claim 1 wherein the aromatic nitrile compound has the following structural formula: ##STR72## wherein X is a monovalent radical selected from the group consisting of --H, --CN, --F, --Cl, --Br, --NO 2 , --CH 3 , --NH 2 , --OCH 3 , ##STR73## and substituted aryls, and X may be substituted at the meta and para positions.
References Cited (Backward Citations)
US3060179A
Cited
US3164555A
Cited
US3502579A
Cited
US3470176A
Cited
US3518264A
Cited
US3809693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |