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US4145524A
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Preparation of heterocyclic block copolymer from perfluoroalkylene oxide α, ω-diamidoximes
Assignee: National Aeronautics and Space Administration
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Filing: 1977-10-17
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Granted: 1979-03-20
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Expires: 1997-10-17
Abstract
Abstract Diamidoxime monomers having the formula: <IMAGE> are intermolecularly and thermally condensed to form a heat and chemical resistant polymer containing 1,2,4-oxadiazole linkages and having the formula: <IMAGE> wherein R represents identical bivalent organic radicals or any combination of bivalent organic radicals selected from the group consisting of -(CX2)p-, wherein p ranges from 2 to 8 when X is fluorine and 2 to 18 when X is hydrogen, chlorine, nitro or aryl; arylene; and an oligometric or polymeric radical prepared by reacting a dicarboxylic acid halide with a fluorinated epoxide and having the formula:
Inventors
- 👤 with respect to an invention of Frosch Robert A. Administrator of the National Aeronautics and Space Administration
- 👤 Leonard O. Ross
- 👤 Robert W. Rosser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:05
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
157 words
A process for preparing a heat and chemical resistant polymer having the formula: ##STR10## wherein y is an integer of at least 2 and is commensurate with a molecular weight range of about 3000 to about 50,000, and R represents identical bivalent organic radicals or any combination of bivalent organic radicals selected from the group consisting of --(CX 2 ) p --, wherein p ranges from 2 to 8 when X is fluorine and 2 to 18 when X is hydrogen, chlorine, nitro or aryl; arlene; and an oligomeric or polymeric radical prepared by reacting a dicarboxylic acid halide with a fluorinated epoxide and having the formula: CFY(OCF.sub.2 CFY).sub.m O(CS.sub.2)p O(CFYCF.sub.2 O).sub.n CFY wherein Y is fluorine or trifluoromethyl, X is nitro, aryl, hydrogen, chlorine or fluorine, p ranges from 1 to 18 and m+n ranges from 2 to 7, which comprises: thermally condensing a diamidoxime monomer of the formula: ##STR11## wherein R is as defined above.
Claim 2
Dependent Claim
157 words
A process for preparing a heat and chemical resistant polymer having the formula: ##STR10## wherein y is an integer of at least 2 and is commensurate with a molecular weight range of about 3000 to about 50,000, and R represents identical bivalent organic radicals or any combination of bivalent organic radicals selected from the group consisting of --(CX 2 ) p --, wherein p ranges from 2 to 8 when X is fluorine and 2 to 18 when X is hydrogen, chlorine, nitro or aryl; arlene; and an oligomeric or polymeric radical prepared by reacting a dicarboxylic acid halide with a fluorinated epoxide and having the formula: CFY(OCF.sub.2 CFY).sub.m O(CS.sub.2)p O(CFYCF.sub.2 O).sub.n CFY wherein Y is fluorine or trifluoromethyl, X is nitro, aryl, hydrogen, chlorine or fluorine, p ranges from 1 to 18 and m+n ranges from 2 to 7, which comprises: thermally condensing a diamidoxime monomer of the formula: ##STR11## wherein R is as defined above.
Claim 3
Dependent Claim
32 words
The process of claim 1, wherein the heating is carried out at temperature within the range of about 100 to about 250° C. for a period of 2 hours to 96 hours.
Claim 4
Dependent Claim
17 words
The process of claim 1, wherein said condensation reaction is conducted in the substantial absence of oxygen.
Claim 5
Dependent Claim
19 words
The process of claim 1, wherein said bivalent organic radical contains at least one bivalent perfluorinated polyalkyl ether radical.
Claim 6
Dependent Claim
62 words
The process of claim 4, wherein said perfluorinated polyalkyl ether radical is one or two moieties of the formula: --CFY(OCF.sub.2 CFY).sub.m O(CX.sub.2).sub.p O(CFYCF.sub.2 O).sub.n CFY-- in which Y is a fluorine atom or a trifluoromethyl group; X represents fluorine, chlorine or hydrogen, aryl or nitro; p is an integer from 1 to 8; and m + n ranges from 2 to 7.
Claim 7
Dependent Claim
78 words
A perfluorinated polyalkyl ether compound of the formula R C(NH 2 )═NOH! 2 wherein R is a bivalent radical consisting of one or two units of the formula: --CFY(OCF.sub.2 CFY).sub.m O(CX.sub.2).sub.p O(CFYCF.sub.2 O).sub.n CFY -- in which Y is a fluorine atom or a trifluoromethyl group; X represents an atom of fluorine, chlorine or hydrogen, aryl or nitro; p is an integer from 1 to 8; and the sum of m + n ranges from 2 to 7.
Claim 8
Dependent Claim
78 words
A perfluorinated polyalkyl ether compound of the formula R C(NH 2 )═NOH! 2 wherein R is a bivalent radical consisting of one or two units of the formula: --CFY(OCF.sub.2 CFY).sub.m O(CX.sub.2).sub.p O(CFYCF.sub.2 O).sub.n CFY -- in which Y is a fluorine atom or a trifluoromethyl group; X represents an atom of fluorine, chlorine or hydrogen, aryl or nitro; p is an integer from 1 to 8; and the sum of m + n ranges from 2 to 7.
Claim 9
Dependent Claim
52 words
A heat and oxygen resistant polymeric material containing 1,2,4-oxadiazole linking groups and having the formula: ##STR12## wherein y is an integer of at least 2 and is commensurate with a molecular weight range of about 3000 to about 50,000 and R is a bivalent fluorinated aliphatic radical as defined in claim 5.
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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |