US4336175A
Expired / Lapsed
US
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Polyimide precursor solutions
Assignee: Fiberite Inc
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Filing: 1980-10-01
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Granted: 1982-06-22
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Expires: 2000-10-01
Abstract
Abstract Stoichiometrically imbalanced solutions of 6FTA and aromatic diamine can be used to prepare laminates and bonded articles having a broad temperature range for consolidation.
Inventors
- 👤 Hugh H. Gibbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:30
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1032
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
In a solution of 2,2-bis(3',4'-dicarboxyphenyl) hexafluoropropane (6FTA), aromatic diamine and a solvent, the improvement wherein the 6FTA and aromatic diamine are present in quantities to provide a stoichiometric monomer imbalance of about from 2 to 9 mole percent, and the solvent is selected from the group consisting of lower alkanols of 1-4 carbon atoms, diglyme and mixtures of lower alkanol and diglyme with each other or each with up to 50% by weight of N-methyl-2-pyrrolidone.
Claim 2
Dependent Claim
75 words
In a solution of 2,2-bis(3',4'-dicarboxyphenyl) hexafluoropropane (6FTA), aromatic diamine and a solvent, the improvement wherein the 6FTA and aromatic diamine are present in quantities to provide a stoichiometric monomer imbalance of about from 2 to 9 mole percent, and the solvent is selected from the group consisting of lower alkanols of 1-4 carbon atoms, diglyme and mixtures of lower alkanol and diglyme with each other or each with up to 50% by weight of N-methyl-2-pyrrolidone.
Claim 3
Dependent Claim
16 words
A solution of claim 1 wherein the monomer imbalance is about from 3 to 8 percent.
Claim 4
Dependent Claim
11 words
A solution of claim 1 wherein the solvent consists of ethanol.
Claim 5
Dependent Claim
11 words
A solution of claim 1 wherein the solvent consists of diglyme.
Claim 6
Dependent Claim
22 words
A solution of claim 1 wherein the solvent consists of a mixture of ethanol and up to 50% by weight of N-methyl-2-pyrrolidone.
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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |