Patent US4555565A successfully refreshed from Google Patents.
US4555565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring-chain polymer containing triaryl-s-triazine ring and other heat-resistant heterocyclic rings
Assignee: Individual
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Filing: 1983-03-31
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Granted: 1985-11-26
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Expires: 2003-03-31
Abstract
Abstract A non-cross-linked or partly cross-linked triaryl-s-triazine ring containing polymer or copolymer is prepared by cyclopolymerizing an aromatic nitrile-modified oligomer or precursor in the presence of excess molar amounts of aromatic nitrile at temperatures above 100° C. to provide a non-cross-linked triaryl-s-triazine extended chain structure. The excess moles of aromatic nitriles above that required to endcap the oligomer results in an extended chain structure. The polymers are useful as a matrix laminating resin in composites containing carbon fibers and similar refractory filler materials to produce desirable refractory materials exhibiting thermal-oxidative stability at elevated temperatures.
Inventors
- 👤 Li-Chen Hsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:59
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/065; C08G73/0655; B; B29; B29D; B29D30/00; B29D30/04; B60; B60C; B60C1/00; C08G18/00; C08G18/06; C08G18/08; C08G18/088; C08G18/0885; C08K; C08K5/00; C08K5/01; C08G2380/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
In a process for preparing triaryl-s-triazine ring containing polymers by heating together a aromatic nitrile with an aromatic nitrile appended or terminated oligomer, the improvement comprising: contacting a mole percent excess of said aromatic nitrile with said aromatic nitrile terminated or appended oilgomer selected from imide, benzimiazole, imidazopyrone, or quinoxaline nitrile-modified oligomers, the mole percent of said aromatic nitrile being in at least 5 mole percent in excess of the moles of said aromatic nitrile required to react with said aromatic nitrile terminated or appended oligomer, and reacting said aromatic nitrile with said aromatic nitrile terminated or appended oligomer to produce a nitrile capped oligomer; and cyclotrimerizing said nitrile-capped oligomer and excess aromatic nitrile mixture in contact with a trimerization catalyst at temperatures above 100° C. and at pressures above 200 PSI to produce a partly crosslinked or substantially non-crosslinked triaryl-s-triazine ring containing chain extended polymer.
Claim 2
Dependent Claim
146 words
In a process for preparing triaryl-s-triazine ring containing polymers by heating together a aromatic nitrile with an aromatic nitrile appended or terminated oligomer, the improvement comprising: contacting a mole percent excess of said aromatic nitrile with said aromatic nitrile terminated or appended oilgomer selected from imide, benzimiazole, imidazopyrone, or quinoxaline nitrile-modified oligomers, the mole percent of said aromatic nitrile being in at least 5 mole percent in excess of the moles of said aromatic nitrile required to react with said aromatic nitrile terminated or appended oligomer, and reacting said aromatic nitrile with said aromatic nitrile terminated or appended oligomer to produce a nitrile capped oligomer; and cyclotrimerizing said nitrile-capped oligomer and excess aromatic nitrile mixture in contact with a trimerization catalyst at temperatures above 100° C. and at pressures above 200 PSI to produce a partly crosslinked or substantially non-crosslinked triaryl-s-triazine ring containing chain extended polymer.
Claim 3
Dependent Claim
26 words
The process in claim 1 wherein the mole percent excess of aromatic nitrile comprises an aromatic nitrile different than the aromatic nitrile for capping the oligomer.
Claim 4
Dependent Claim
27 words
The process in claim 1 wherein the mole percent excess of aromatic nitrile is between 5% and 50% mole excess greater than required for capping the oligomer.
Claim 5
Dependent Claim
26 words
The process in claim 1 wherein the mole percent excess of aromatic nitrile is selected from a compound having a structure HOOC--Ar--CN or (HOOC) 2 --Ar--CN.
Claim 6
Dependent Claim
30 words
The process in claim 1 wherein the mole percent excess of aromatic nitrile is selected from a compound having the structure H 2 N--Ar--CN or (H 2 N) 2 --Ar--CN.
Claim 7
Dependent Claim
24 words
The process in claim 1 wherein the mole percent excess of aromatic nitrile is a compound having the structure (CH 3 ) 2 --N--Ar--CN.
Claim 8
Dependent Claim
33 words
The process in claim 1 wherein the mole percent excess of the aromatic nitrile is selected from a compound having the structure Ar--CH, F--Ar--CN, F 3 C--Ar--CN, or (F 3 C) 2 --Ar--CN.
Claim 9
Dependent Claim
30 words
The process in claim 1 wherein the mole percent excess of aromatic nitrile is selected from a compound having the structure HOSO 2 --Ar--CN or (HOSO 2 ) 2 --Ar--CN.
Claim 10
Dependent Claim
15 words
The process in claim 1 wherein the mole percent excess of aromatic nitrile is cyanopyridine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |