US4382126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aqueous coating composition comprising polyimide-forming reactants
Assignee: Von Roll Isola USA Inc
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Filing: 1982-01-18
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Granted: 1983-05-03
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Expires: 2002-01-18
Abstract
Abstract Wire coating formulations are provided by heating a mixture of aromatic dianhydride, water and a monoalkyl glycol ether, followed by the addition of organic diamine. The resulting mixture is a stable wire coating enamel capable of forming flexible wire enamels upon cure.
Inventors
- 👤 Edith M. Boldebuck
- 👤 Eugene G. Banucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:15
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/308; C; C09; C09D; C09D179/00; C09D179/04; C09D179/08; H01B3/303; H01B3/305; H01B3/306
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A method for making a wire coating composition in the form of a stable aqueous solution comprising (1) heating a mixture of an organic dianhydride of the formula, ##STR9## monoalkyl ether of ethylene glycol or diethylene glycol and water at a temperature of 70° C. to 135° C. where there is utilized in the mixture from about 0.35 to about 2.5 parts of monoalkyl glycol ether and about 0.05 to about 0.4 part of water, per part of dianhydride, to form a clear solution, (2) adding to the solution of (1) about an equal molar amount and up to 25 mole percent excess, based on moles of organic dianhydride of (1), and organic diamine of the formula, H.sub.2 NR.sup.1 NH.sub.2, where R is a C.sub.(6-30) aromatic organic radical and R 1 is a C.sub.(6-30) organic radical.
Claim 2
Independent Claim
136 words
A method for making a wire coating composition in the form of a stable aqueous solution comprising (1) heating a mixture of an organic dianhydride of the formula, ##STR9## monoalkyl ether of ethylene glycol or diethylene glycol and water at a temperature of 70° C. to 135° C. where there is utilized in the mixture from about 0.35 to about 2.5 parts of monoalkyl glycol ether and about 0.05 to about 0.4 part of water, per part of dianhydride, to form a clear solution, (2) adding to the solution of (1) about an equal molar amount and up to 25 mole percent excess, based on moles of organic dianhydride of (1), and organic diamine of the formula, H.sub.2 NR.sup.1 NH.sub.2, where R is a C.sub.(6-30) aromatic organic radical and R 1 is a C.sub.(6-30) organic radical.
Claim 3
Dependent Claim
14 words
A method in accordance with claim 1, where the organic dianhydride is 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride.
Claim 4
Dependent Claim
14 words
A method in accordance with claim 1, where the organic diamine is methylene dianiline.
Claim 5
Dependent Claim
13 words
A method in accordance with claim 1, where the organic diamine is oxydianiline.
Claim 6
Dependent Claim
13 words
A method in accordance with claim 1, where the organic diamine is metaphenylenediamine.
Claim 7
Dependent Claim
19 words
A method in accordance with claim 1, where the monoalkyl glycol ether is the methyl ether of diethylene glycol.
Claim 8
Dependent Claim
16 words
A method in accordance with claim 1, where a mixture of monoalkyl glycol ether is utilized.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |