Patent US4284461A successfully refreshed from Google Patents.
US4284461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum ion-containing polyimide adhesives
Assignee: National Aeronautics and Space Administration
•
Filing: 1979-11-07
•
Granted: 1981-08-18
•
Expires: 1999-11-07
Abstract
Abstract A method for preparing an aluminum ion-filled polyimide adhesive wherein a meta-oriented aromatic diamine is reacted with an aromatic dianhydride and an aluminum compound in the presence of a water or lower alkanol miscible ether solvent to produce an intermediate polyamic acid; and thereafter converting the polyamic acid to the thermally stable, metal ion-filled polyimide by heating in the temperature range of 300 DEG C. to produce a flexible, high temperature adhesive.
Inventors
- 👤 with respect to an invention of Frosch Robert A. Administrator of the National Aeronautics and Space Administration
- 👤 Anne K. St. Clair
- 👤 Larry T. Taylor
- 👤 Terry L. St. Clair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0091; H; H05; H05K; H05K3/00; H05K3/38; H05K3/386
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A method for preparing an aluminun ion-containing polyimide adhesive solution which comprises: reacting an aromatic dianhydride with an equimolar quantity of a meta-oriented aromatic diamine followed by the addition of 2-3 percent by weight of an aluminum ion-containing metal complex; the dianhydride and diamine reactants being previously dissolved in a solvent or mixture of solvents, at least one of which is selected from the group consisting of, 1,2-dimethoxyethane, bis(2-methoxyethyl)-ether, 1,2-bis(2-methoxyethoxy)ethane, and bis-[2-(2-methoxyethoxy)-ethyl]ether.
Claim 2
Independent Claim
72 words
A method for preparing an aluminun ion-containing polyimide adhesive solution which comprises: reacting an aromatic dianhydride with an equimolar quantity of a meta-oriented aromatic diamine followed by the addition of 2-3 percent by weight of an aluminum ion-containing metal complex; the dianhydride and diamine reactants being previously dissolved in a solvent or mixture of solvents, at least one of which is selected from the group consisting of, 1,2-dimethoxyethane, bis(2-methoxyethyl)-ether, 1,2-bis(2-methoxyethoxy)ethane, and bis-[2-(2-methoxyethoxy)-ethyl]ether.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein the diamine is selected from the group of meta-containing diamines consisting of: 3,3'-diaminobenzophenone, 3,3'-diaminodiphyenylmethane, 3,3'-diaminodiphenyl sulfone, meta-phenylene diamine, 3,4'-diaminodiphenylmethane, 3,4'-diaminodiphenyl sulfone, and 3-4'-diaminobenzophenone.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein the dianhydride is selected from the group of dianhydrides consisting of: 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride, bis(3,4-dicarboxyphenyl)ether dianhydride, bis(3,4-dicarboxyphenyl)sulfone dianhydride, bis-4-(3',4'-dicarboxyphenoxy)diphenyl sulfone dianhydride, and 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride.
Claim 5
Dependent Claim
51 words
The method of claim 1 wherein the initial reactant product is an aluminum ion-containing aromatic polyamic acid which has recurring units of the formula: ##STR2## where Z is selected from the group consisting ##STR3## R 1 is selected from ##STR4## and, wherein Z' is selected from the group consisting of ##STR5##
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the metal complex is tris(acetylacetonato)aluminum (III) or Al(acac) 3 .
Claim 7
Dependent Claim
105 words
The method of claim 5 including the further steps of applying the aluminum ion-containing adhesive solution to substrate surfaces, allowing some or all of the solvent to evaporate, assembling together the treated substrate surfaces and heating the Al/polyamic acid in the temperature range of 250°-350° C. for at least one hour to complete evaporation of the solvent and to convert the Al/polyamic acid to a thermally resistant cyclic aluminum ion-containing polyimide having the recurring units of the formula: ##STR6## where Z is selected from the group consisting ##STR7## R 1 is selected from ##STR8## and, where Z' is selected from the group consisting of ##STR9##
References Cited (Backward Citations)
US3108091A
Cited
US3407169A
Cited
US3458474A
Cited
US3410826A
Cited
US3740366A
Cited
US3996203A
Cited
US4063984A
Cited
US4065345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |