US3673145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyimide solution and method of preparing same
Assignee: Toray Industries Inc
•
Filing: 1969-09-02
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Granted: 1972-06-27
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Expires: 1989-09-02
Abstract
Abstract Novel polyimide solutions are provided which are obtained by reacting 1,2,3,4-butane tetracarboxylic acid or a functional derivative thereof with an organic diamine for example an aromatic diamine such as diaminodiphenyl ether in certain reaction solvents for example phenols, nitrobenzenes, pyridines, quinolines, N-alkyl lactams and cyanobenzenes at a temperature of from 100* C. to the boiling point of the reaction mixture until a polyimide solution is obtained having an imidization ratio of 5098 percent is obtained. The products thus obtained can be employed as varnishes, to make film coating for electric cable, as adhesives or blended with pigments and the like to make pains.
Inventors
- 👤 Muneyoshi Minami
- 👤 Masaharu Taniguchi
- 👤 Tadao Tsutsomi
- 👤 Masakazo Murakami
- 👤 Toshiya Yoshii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:10
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The heat resistant paint comprised of the polyimide solution composition of claim 1 and a pigment.
Claim 2
Dependent Claim
13 words
The heat resistant adhesive comprised of the polyimide solution composition of claim 1.
Claim 3
Dependent Claim
31 words
A process for the production of an insulated wire which comprises applying a polyimide solution according to claim 1 to a conductor and baking the same to complete the imidization reaction.
Claim 4
Dependent Claim
50 words
The process for the production of a heat resistant film which comprises casting the polyimide solution composition according to claim 1 to make a self-supporting film having a residual solvent ratio of 15-45 parts by weight and heat treating said film at a temperature within the range of 250*-350* C.
Claim 5
Dependent Claim
87 words
The process for the production of a heat resistant film which comprises casting the solution composition of claim 1 to make a self-supporting film having a residual solvent ratio of 25-45 parts by weight, subjecting said film to a first heat treatment at a temperature within the range of 160* C to 250* C to make the residual solvent ratio 5-15 parts by weight and further subjecting the heat treated film to a second heat treatment at a temperature within the range of 250* to 350* C.
Claim 6
Dependent Claim
32 words
A process for the production of a reinforced shaped article which comprise mixing with the solution composition of claim 1 with substrate, shaping the resulting mixture and heat treating the shaped mixture.
References Cited (Backward Citations)
FR849806A
Cited
US2304687A
Cited
US3179634A
Cited
US3295940A
Cited
GB1058390A
Cited
US3277043A
Cited
US3493540A
Cited
US3414543A
Cited
US3501443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |