US4505980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated wire
Assignee: Resonac Corp
•
Filing: 1982-11-04
•
Granted: 1985-03-19
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Expires: 2002-11-04
Abstract
Abstract An insulated wire having excellent heat resistance, abrasion resistance and flexibility can be prepared by coating on an electric conductor directly or via another insulating material a polyamide-imide resin composition prepared by reacting an aromatic diisocyanate and a tricarboxylic acid anhydride in the presence of a basic solvent while adjusting the resin content at 40% by weight or more, and adding to the reaction system a lactam in an amount of 0.1 to 1.0 mole per mole of the aromatic diisocyanate, and if necessary, an alcohol and/or an oxime in an amount of 0.01 to 0.5 mole per mole of the aromatic diisocyanate before, during or after the above-mentioned reaction to mask terminal functional groups and to make the reduced viscosity of the composition 0.1 to 0.27, and baking the resin composition.
Inventors
- 👤 Hiroshi Nishizawa
- 👤 Yoshiyuki Mukoyama
- 👤 Shozo Kasai
- 👤 Yasunori Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:31
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; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
116 words
An insulated wire obtained by coating on an electric conductor directly or via another insulating material a polyamide-imide resin composition prepared by a process comprising reacting an aromatic diisocyanate and a tricarboxylic acid anhydride in approximately equimolar amounts in the presence of a basic solvent at a reaction temperature of about 160° C. or less while adjusting the resin content at 40% by weight or more, adding to the reaction system a lactam in an amount of 0.1 to 1.0 mole per mole of the aromatic diisocyanate so as to mask terminal functional groups present in the reaction system and to make the reduced viscosity of the resin 0.1 to 0.27, and baking the resin composition.
Claim 2
Dependent Claim
116 words
An insulated wire obtained by coating on an electric conductor directly or via another insulating material a polyamide-imide resin composition prepared by a process comprising reacting an aromatic diisocyanate and a tricarboxylic acid anhydride in approximately equimolar amounts in the presence of a basic solvent at a reaction temperature of about 160° C. or less while adjusting the resin content at 40% by weight or more, adding to the reaction system a lactam in an amount of 0.1 to 1.0 mole per mole of the aromatic diisocyanate so as to mask terminal functional groups present in the reaction system and to make the reduced viscosity of the resin 0.1 to 0.27, and baking the resin composition.
Claim 3
Dependent Claim
17 words
An insulated wire according to claim 1, wherein the aromatic diisocyanate is 4,4'-diphenylmethane diisocyanate or tolylene diisocyanate.
Claim 4
Dependent Claim
15 words
An insulated wire according to claim 1, wherein the tricarboxylic acid anhydride is trimellitic anhydride.
Claim 5
Dependent Claim
15 words
An insulated wire according to claim 1, wherein the basic solvent is N-methylpyrrolidone or dimethylformamide.
Claim 6
Dependent Claim
12 words
An insulated wire according to claim 1, wherein the lactam is ε-caprolactam.
Claim 7
Dependent Claim
43 words
An insulated wire according to claim 1, wherein the another insulating material is at least one member selected from the group consisting of substantially linear thermoplastic polyesters, branched thermosetting polyesters, polyamides, polyvinyl formals, polyurethanes, polyimides, polyimidazoles, polyimidazopyrrolones, polyhydantoins, polyesterimides, polyamide-imide-esters, and epoxy resins.
Claim 8
Dependent Claim
30 words
An insulated wire according to claim 1, wherein the addition of lactam to the reaction system is conducted during the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride.
Claim 9
Dependent Claim
30 words
An insulated wire according to claim 1, wherein the addition of lactam to the reaction system is conducted before the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride.
Claim 10
Dependent Claim
30 words
An insulated wire according to claim 1, wherein the addition of lactam to the reaction system is conducted after the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride.
Claim 11
Dependent Claim
151 words
An insulated wire obtained by coating on an electric conductor directly or via another insulating material a polyamide-imide resin composition prepared by a process comprising reacting an aromatic diisocyanate and a tricarboxylic acid anhydride in approximately equimolar amounts in the presence of a basic solvent at a reaction temperature of about 160° C. or less while adjusting the resin content at 40% by weight or more, adding to the reaction system a lactam in an amount of 0.1 to 1.0 mole per mole of the aromatic diisocyanate, and adding at least one member selected from the group consisting of an alcohol and an oxime in an amount of 0.01 to 0.5 mole per mole of the aromatic diisocyanate to the reaction system so as to mask terminal functional groups present in the reaction system and to make the reduced viscosity of the resin 0.1 to 0.27, and baking the resin composition.
Claim 12
Dependent Claim
151 words
An insulated wire obtained by coating on an electric conductor directly or via another insulating material a polyamide-imide resin composition prepared by a process comprising reacting an aromatic diisocyanate and a tricarboxylic acid anhydride in approximately equimolar amounts in the presence of a basic solvent at a reaction temperature of about 160° C. or less while adjusting the resin content at 40% by weight or more, adding to the reaction system a lactam in an amount of 0.1 to 1.0 mole per mole of the aromatic diisocyanate, and adding at least one member selected from the group consisting of an alcohol and an oxime in an amount of 0.01 to 0.5 mole per mole of the aromatic diisocyanate to the reaction system so as to mask terminal functional groups present in the reaction system and to make the reduced viscosity of the resin 0.1 to 0.27, and baking the resin composition.
Claim 13
Dependent Claim
18 words
An insulated wire according to claim 10, wherein the alcohol is methanol and the oxime is 2-butanone oxime.
Claim 14
Dependent Claim
71 words
An insulated wire according to claim 10, wherein the polyamide-imide resin is prepared by adding a lactam to the reaction system during the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride and adding at least one member selected from the group consisting of an alcohol and an oxime to the reaction system after the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride to mask terminal functional groups.
Claim 15
Dependent Claim
54 words
An insulated wire according to claim 10, wherein the addition of lactam to the reaction system and the addition of at least one member selected from the group consisting of an alcohol and an oxime to the reaction system are conducted simultaneously during the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride.
Claim 16
Dependent Claim
54 words
An insulated wire according to claim 10, wherein the addition of lactam to the reaction system and the addition of at least one member selected from the group consisting of an alcohol and an oxime to the reaction system are conducted simultaneously after the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride.
Claim 17
Dependent Claim
54 words
An insulated wire according to claim 10, wherein the addition of lactam to the reaction system and the addition of at least one member selected from the group consisting of an alcohol and an oxime to the reaction system are conducted separately during the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride.
Claim 18
Dependent Claim
56 words
An insulated wire according to claim 10, wherein the addition of lactam to the reaction system is conducted after the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride and then the addition of at least one member selected from the group consisting of an alcohol and an oxime to the reaction system is conducted.
Claim 19
Dependent Claim
17 words
An insulated wire according to claim 10, wherein the aromatic diisocyanate is 4,4'-diphenylmethane diisocyanate or tolylene diisocyanate.
Claim 20
Dependent Claim
15 words
An insulated wire according to claim 10, wherein the tricarboxylic acid anhydride is trimellitic anhydride.
Claim 21
Dependent Claim
15 words
An insulated wire according to claim 10, wherein the basic solvent is N-methylpyrrolidone or dimethylformamide.
Claim 22
Dependent Claim
12 words
An insulated wire according to claim 10, wherein the lactam is ε-caprolactam.
Claim 23
Dependent Claim
43 words
An insulated wire according to claim 10, wherein the another insulating material is at least one member selected from the group consisting of substantially linear thermoplastic polyesters, branched thermosetting polyesters, polyamides, polyvinyl formals, polyurethanes, polyimides, polyimidazoles, polyimidazopyrrolones, polyhydantoins, polyesterimides, polyamide-imide-esters, and epoxy resins.
Claim 24
Dependent Claim
71 words
An insulated wire according to claim 10, wherein the polyamide-imide resin is prepared by adding a lactam to the reaction system before the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride and adding at least one member selected from the group consisting of an alcohol and an oxime to the reaction system after the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride to mask terminal functional groups.
Claim 25
Dependent Claim
54 words
An insulated wire according to claim 10, wherein the addition of lactam to the reaction system and the addition of at least one member selected from the group consisting of an alcohol and an oxime to the reaction system are conducted simultaneously before the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride.
Claim 26
Dependent Claim
54 words
An insulated wire according to claim 10, wherein the addition of lactam to the reaction system and the addition of at least one member selected from the group consisting of an alcohol and an oxime to the reaction system are conducted separately before the reaction of the aromatic diisocyanate and the tricarboxylic acid anhydride.
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) | 1988-03-18 | 1988-09-17 | 1989-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-18 | 1992-09-17 | 1993-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-18 | 1996-09-17 | 1997-03-19 | $7700.00 | Window Closed / Lapsed |