US4121266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide-imide precondensates
Assignee: BASF SE
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Filing: 1976-06-07
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Granted: 1978-10-17
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Expires: 1996-06-07
Abstract
Abstract A polyamide-imide precondensate which is solid at room temperature, but is fusible and soluble in polar solvents. It is manufactured by first condensing 1 mole of diamine with 2 moles of tricarboxylic acid anhydride in a diol as the solvent, to give a diimide-dicarboxylic acid, then esterifying the diimide-dicarboxylic acid with the diol and finally effecting the polycondensation by adding 1 mole of diamine per mole of diester. The precondensate may be used, as a melt, as a solution in organic solvents or as an aqueous dispersion, for coating electrical conductors.
Inventors
- 👤 Jenoe Kovacs
- 👤 Hans Jung
- 👤 Matthias Marx
- 👤 Herbert Spoor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:46
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; H01B3/305; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31623
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
A process for the manufacture of polyamide-imide precondensate, which is solid at room temperature but is fusible and soluble in polar solvents, by reacting an aromatic tricarboxylic acid anhydride with a diprimary aromatic amine in the presence of an aliphatic diol, in which reaction first 1 mole of diamine is condensed with 2 moles of tricarboxylic acid anhydride in the diol as the solvent, at below 150° C., to give a diimide-dicarboxylic acid, the latter is then esterified
Claim 2
Dependent Claim
78 words
A process for the manufacture of polyamide-imide precondensate, which is solid at room temperature but is fusible and soluble in polar solvents, by reacting an aromatic tricarboxylic acid anhydride with a diprimary aromatic amine in the presence of an aliphatic diol, in which reaction first 1 mole of diamine is condensed with 2 moles of tricarboxylic acid anhydride in the diol as the solvent, at below 150° C., to give a diimide-dicarboxylic acid, the latter is then esterified
Claim 3
Dependent Claim
29 words
A process for the manufacture of a polyamide-imide precondensate as claimed in claim 1, where from 1.05 to 1.4 moles of diamine are added per mole of the diester.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |