Patent US3959233A successfully refreshed from Google Patents.
US3959233A
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Process for preparing polyamide-imide from trimellitic acid, diamine and diisocyanate and polyamide imide shaped articles
Assignee: BP Corp North America Inc
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Filing: 1973-04-09
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Granted: 1976-05-25
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Expires: 1993-04-09
Abstract
Abstract Polyamide-imides are prepared by reacting trimellitic acid with an aromatic or an aliphatic diamine in the molar ratio of about 1:0.55 to 1:0.95 and then reacting this product with at least 0.45 to about 0.75 moles to about 0.05 to about 0.35 moles of an aromatic diisocyanate. The products are useful as wire enamels and coatings when they are formulated into wire enamels and coated on electrical conductors. They may also be used as molding resins.
Inventors
- 👤 Robert B. Hanson
- 👤 James R. Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:31
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6415; C08G18/6438; H; H01; H01B; H01B3/00; H01B3/02; H01B3/10; H01B3/105; H01B3/18; H01B3/30; H01B3/303; H01B3/306; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
96 words
A process for preparing high molecular weight polyamide-imide polymers having film-forming properties which process comprises first condensing trimellitic acid and a primary diamine in a mole ratio of about 1 to 0.7 to about 1 to 0.95 at a temperature of about 210°C. to about 250°C. to give a low molecular weight polymer having an excess of trimellitic anhydride moieties and then further condensing this polymer with about 0.05 to about 0.75 moles of a diisocyanate for each mole of trimellitic acid moiety in an inert solvent at a temperature of about 25°C. to about 150°C.
Claim 2
Dependent Claim
96 words
A process for preparing high molecular weight polyamide-imide polymers having film-forming properties which process comprises first condensing trimellitic acid and a primary diamine in a mole ratio of about 1 to 0.7 to about 1 to 0.95 at a temperature of about 210°C. to about 250°C. to give a low molecular weight polymer having an excess of trimellitic anhydride moieties and then further condensing this polymer with about 0.05 to about 0.75 moles of a diisocyanate for each mole of trimellitic acid moiety in an inert solvent at a temperature of about 25°C. to about 150°C.
Claim 3
Dependent Claim
42 words
The process of claim 1 wherein the molar ratio of the trimellitic acid to the diamine is about 1 to 0.7 to about 1 to 0.8 and the mole ratio of the diisocyanate to the trimellitic acid moiety is 0.2:1 to 0.3:1.
Claim 4
Dependent Claim
40 words
The process of claim 1 wherein the condensation of the trimellitic acid with the diamine is carried out at a temperature of about 220°C to about 230°C and the further condensation is carried out at about 130°C to about 140°C.
Claim 5
Dependent Claim
18 words
An electrical conductor having a continuous coating of the polyamide-imide prepared according to the process of claim 1.
Claim 6
Dependent Claim
13 words
A film of the polyamide-imide prepared according to the process of claim 1.
Claim 7
Dependent Claim
13 words
A process according to claim 1 wherein the aromatic diamine is methylene dianaline.
Claim 8
Dependent Claim
12 words
A process according to claim 1 wherein the aromatic diisocyanate is methylene-p-phenyldiisocyanate.
Claim 9
Dependent Claim
14 words
A fiber prepared from the polyamide-imide prepared according to the process of claim 1.
Claim 10
Dependent Claim
13 words
An adhesive of the polyamide-imide prepared according to the process of claim 1.
Claim 11
Dependent Claim
20 words
A laminate having a plurality of layers bonded together with the polyamide-imide prepared according to the process of claim 1.
Claim 12
Dependent Claim
10 words
A molded article prepared from the polyamide-imide of claim 1.
Claim 13
Dependent Claim
101 words
In combination with an article coated with a protective material, wherein the improvement comprises the coating material which is a high molecular weight polyamide-imide polymer prepared by a process comprising first condensing trimellitic acid and a primary diamine in a mole ratio of about 1 to 0.7 to about 1 to 0.95 at a temperature of about 210°C. to about 250°C. to give a low molecular weight polymer, further condensing this polymer with about 0.05 to about 0.75 moles of a diisocyanate for each mole of trimellitic acid in an inert solvent at a temperatue of about 25°C. to about 150°C.
Claim 14
Dependent Claim
101 words
In combination with an article coated with a protective material, wherein the improvement comprises the coating material which is a high molecular weight polyamide-imide polymer prepared by a process comprising first condensing trimellitic acid and a primary diamine in a mole ratio of about 1 to 0.7 to about 1 to 0.95 at a temperature of about 210°C. to about 250°C. to give a low molecular weight polymer, further condensing this polymer with about 0.05 to about 0.75 moles of a diisocyanate for each mole of trimellitic acid in an inert solvent at a temperatue of about 25°C. to about 150°C.
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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |