Patent US2462675A successfully refreshed from Google Patents.
Patent US4221897A successfully refreshed from Google Patents.
US4221897A
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Method for making polyetheramide acid
Assignee: General Electric Co
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Filing: 1979-05-09
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Granted: 1980-09-09
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Expires: 1999-05-09
Abstract
Abstract A method is provided for making polyetheramide acid having an intrinsic viscosity in N,N-dimethylacetamide of about 0.05 dl/g to 0.4 dl/g at 25° C. A mixture of aromatic bis(ether dicarboxylic acid) or dianhydride is heated with a substantially equal molar amount of organic diamine in the presence of water and in the substantial absence of an organic solvent. The resulting polyetheramide acid is recovered as a finely divided powder and can be used to make high molecular weight polyetherimide by melt extrusion.
Inventors
- 👤 Tohru Takekoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:55
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/1053; C08G73/1003; C08G73/1007; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
232 words
A method for making polyetheramide acid imide or polyetherimide which comprises (A) heating a mixture at a temperature in the range of from 30° C. to 250° C. which is substantially free of organic solvent and which comprises by weight 20% to 95% of water, and 5% to 80% of a substantially equal molar mixture of organic diamine of the formula, H.sub.2 N--R--NH.sub.2, and a bis(ether dicarbonyl) compound of the formula, Q.sup.1 --O--Z--O--Q.sup.1, and (B) recovering the polyetheramide acid imide or polyetherimide from the mixture of (A), where Z is a member selected from ##STR20## and divalent organic radicals of the general formula, ##STR21## where X is a member selected from the class consisting of divalent radicals of the formulas, ##STR22## R is a divalent organic radical selected from the class consisting of aromatic hydrocarbon radicals having from 6 to 20 carbon atmos and halogenated derivatives thereof, alkylene radicals having from 2 to about 20 carbon atoms, cycloalkylene radicals having from 3 to 20 carbon atoms, from C 2 to about C 8 alkylene terminated polydiorganosiloxane and divalent radicals of the general formula, ##STR23## Q is a member selected from the class consisting of --O--, --S--, and --C x H 2x --, Q 1 is a member selected from ##STR24## y is an integer from 1 to 5, x is an integer from 1 to 5 and n is 0 or 1.
Claim 2
Independent Claim
232 words
A method for making polyetheramide acid imide or polyetherimide which comprises (A) heating a mixture at a temperature in the range of from 30° C. to 250° C. which is substantially free of organic solvent and which comprises by weight 20% to 95% of water, and 5% to 80% of a substantially equal molar mixture of organic diamine of the formula, H.sub.2 N--R--NH.sub.2, and a bis(ether dicarbonyl) compound of the formula, Q.sup.1 --O--Z--O--Q.sup.1, and (B) recovering the polyetheramide acid imide or polyetherimide from the mixture of (A), where Z is a member selected from ##STR20## and divalent organic radicals of the general formula, ##STR21## where X is a member selected from the class consisting of divalent radicals of the formulas, ##STR22## R is a divalent organic radical selected from the class consisting of aromatic hydrocarbon radicals having from 6 to 20 carbon atmos and halogenated derivatives thereof, alkylene radicals having from 2 to about 20 carbon atoms, cycloalkylene radicals having from 3 to 20 carbon atoms, from C 2 to about C 8 alkylene terminated polydiorganosiloxane and divalent radicals of the general formula, ##STR23## Q is a member selected from the class consisting of --O--, --S--, and --C x H 2x --, Q 1 is a member selected from ##STR24## y is an integer from 1 to 5, x is an integer from 1 to 5 and n is 0 or 1.
Claim 3
Dependent Claim
14 words
A method in accordance with claim 1, where the dicarbonyl compound is 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]-propane dianhydride.
Claim 4
Dependent Claim
13 words
A method in accordance with claim 1, where the dicarbonyl compound is 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane.
Claim 5
Dependent Claim
14 words
A method in accordance with claim 1, where the organic diamine is meta-phenylene diamine.
Claim 6
Independent Claim
176 words
A method for making polyimide which comprises, (C) heating a mixture which is substantially free of organic solvent and which comprises by weight 20% to 95% of water and 5% to 80% of a substantially equal molar mixture of organic diamine of the formula, NH.sub.2 --R--NH.sub.2, and an organic dianhydride of the formula, ##STR25## (D) recovering the polyimide from the mixture of (C), where R 2 is a C.sub.(6-20) tetravalent organic radical and R is a divalent organic radical selected from the class consisting of aromatic hydrocarbon radicals having from 6 to 20 carbon atoms and halogenated derivatives thereof, alkylene radicals having from 2 to about 20 carbon atoms, cycloalkylene radicals having from 3 to 20 carbon atoms, from C 2 to about C 8 alkylene terminated polydiorganosiloxane and divalent radicals of the general formula, ##STR26## Q is a member selected from the class consisting of --O--, --S--, and --C x H 2x --, y is an integer from 1 to 5, x is an integer from 1 to 5 and n is 0 or 1.
Claim 7
Independent Claim
176 words
A method for making polyimide which comprises, (C) heating a mixture which is substantially free of organic solvent and which comprises by weight 20% to 95% of water and 5% to 80% of a substantially equal molar mixture of organic diamine of the formula, NH.sub.2 --R--NH.sub.2, and an organic dianhydride of the formula, ##STR25## (D) recovering the polyimide from the mixture of (C), where R 2 is a C.sub.(6-20) tetravalent organic radical and R is a divalent organic radical selected from the class consisting of aromatic hydrocarbon radicals having from 6 to 20 carbon atoms and halogenated derivatives thereof, alkylene radicals having from 2 to about 20 carbon atoms, cycloalkylene radicals having from 3 to 20 carbon atoms, from C 2 to about C 8 alkylene terminated polydiorganosiloxane and divalent radicals of the general formula, ##STR26## Q is a member selected from the class consisting of --O--, --S--, and --C x H 2x --, y is an integer from 1 to 5, x is an integer from 1 to 5 and n is 0 or 1.
Claim 8
Dependent Claim
12 words
A method in accordance with claim 5, where R 2 is ##STR27##
Claim 9
Dependent Claim
12 words
A method in accordance with claim 5, where R 2 is ##STR28##
References Cited (Backward Citations)
US3528937A
Cited
US3575923A
Cited
US3847867A
Cited
US3989670A
Cited
US3905942A
Cited
US4048142A
Cited
US3983093A
Cited
US4087441A
Cited
US4073773A
Cited
US4157996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |