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US4294952A
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Polyamide-imide resin and its production
Assignee: Resonac Corp
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Filing: 1979-11-16
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Granted: 1981-10-13
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Expires: 1999-11-16
Abstract
Abstract A polyamide-imide resin obtained by reacting in a cresol type solvent a polyisocyanate containing isocyanurate rings, an aromatic diisocyanate, a lactam and a polycarboxylic acid containing at least one acid anhydride group, said polyisocyanate being used in an amount of 1 to 30 equivalent % and said lactam in an amount of 20 to 80 equivalent % each based on the total isocyanate equivalent can give a resin composition or a varnish suitable for coating, particularly for producing insulated wire excellent in heat resistance, flexibility, resistance to Freon, wear resistance, and the like.
Inventors
- 👤 Yoshiyuki Mukoyama
- 👤 Touichi Sakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:48
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/285; C08G18/2855; C08G18/30; C08G18/34; C08G18/343; C08G18/345; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/305; H01B3/306; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31605; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A polyamide-imide resin obtained by reacting in a cresol type solvent a polyisocyanate containing isocyanurate rings, an aromatic diisocyanate, a lactam and a polycarboxylic acid containing at least one acid anhydride group at a temperature of 160° to 230° C., said polyisocyanate being used in an amount of 1 to 30 equivalent % based on the total isocyanate equivalent and said lactam being used in an amount of 20 to 80 equivalent % based on the total isocyanate equivalent; with the amounts of the isocyanate and the acid being 1.5 to 0.71/l in terms of a ratio of the carboxyl group and the acid anhydride group to the isocyanate group.
Claim 2
Dependent Claim
110 words
A polyamide-imide resin obtained by reacting in a cresol type solvent a polyisocyanate containing isocyanurate rings, an aromatic diisocyanate, a lactam and a polycarboxylic acid containing at least one acid anhydride group at a temperature of 160° to 230° C., said polyisocyanate being used in an amount of 1 to 30 equivalent % based on the total isocyanate equivalent and said lactam being used in an amount of 20 to 80 equivalent % based on the total isocyanate equivalent; with the amounts of the isocyanate and the acid being 1.5 to 0.71/l in terms of a ratio of the carboxyl group and the acid anhydride group to the isocyanate group.
Claim 3
Dependent Claim
27 words
A polyamide-imide resin according to claim 1, wherein the polyisocyanate containing isocyanurate rings is obtained by trimerization from 4,4'-diphenylmethane diisocyanate, 4,4'-diphenylether diisocyanate, tolylene diisocyanate or xylylene diisocyanate.
Claim 4
Dependent Claim
21 words
A polyamide-imide resin according to claim 1, wherein the aromatic diisocyanate is 4,4'-diphenylmethane diisocyanate, 4,4'-diphenylether diisocyanate, tolylene diisocyanate or xylylene diisocyanate.
Claim 5
Dependent Claim
12 words
A polyamide-imide resin according to claim 1, wherein the lactam is ε-caprolactam.
Claim 6
Dependent Claim
44 words
A polyamide-imide resin according to claim 1, wherein the polycarboxylic acid containing at least one acid anhydride group is a compound of the formula: ##STR2## wherein R is hydrogen, alkyl or phenyl; and X is --CH 2 --, --CO--, --SO 2 -- or --O--.
Claim 7
Dependent Claim
17 words
A polyamide-imide resin according to claim 1, wherein the cresol type solvent is cresol, phenol or xylenol.
Claim 8
Dependent Claim
25 words
A polyamide-imide resin according to claim 1 or 2, wherein the polyisocyanate containing isocyanurate rings contains remaining isocyanate groups in proportion of 10 to 70%.
Claim 9
Dependent Claim
56 words
A polyamide-imide resin according to claim 1, wherein the polyamide-imide resin is obtained by reacting in cresol a polyisocyanate containing isocyanurate rings prepared by trimeization from tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, ε-caprolactam and trimellitic anhydride, said polyisocyanate containing isocyanurate rings being used in an amount of 1 to 30 equivalent % based on the total isocyanate equivalent
Claim 10
Dependent Claim
114 words
A process for producing a polyamide-imide resin which comprises reacting in a cresol type solvent a polyisocyanate containing isocyanurate rings, an aromatic diisocyanate, a lactam and a polycarboxylic acid containing at least one acid anhydride group at a temperature of 160° to 230° C., said polyisocyanate being used in an amount of 1 to 30 equivalent % based on the total isocyanate equivalent and said lactam being used in an amount of 20 to 80 equivalent % based on the total isocyanate equivalent; with the amounts of the isocyanate and the acid being 1.5 to 0.71/l in terms of a ratio of the carboxyl group and the acid anhydride group to the isocyanate group.
Claim 11
Dependent Claim
114 words
A process for producing a polyamide-imide resin which comprises reacting in a cresol type solvent a polyisocyanate containing isocyanurate rings, an aromatic diisocyanate, a lactam and a polycarboxylic acid containing at least one acid anhydride group at a temperature of 160° to 230° C., said polyisocyanate being used in an amount of 1 to 30 equivalent % based on the total isocyanate equivalent and said lactam being used in an amount of 20 to 80 equivalent % based on the total isocyanate equivalent; with the amounts of the isocyanate and the acid being 1.5 to 0.71/l in terms of a ratio of the carboxyl group and the acid anhydride group to the isocyanate group.
Claim 12
Dependent Claim
64 words
A process according to claim 9, wherein the polyisocyanate containing isocyanurate rings, the aromatic diisocyanate and the lactam are reacted first in a cresol type solvent at a temperature of 160° to 190° C. and thereafter the polycarboxylic acid containing at least one acid anhydride group is added to the reaction system to continue the reaction at a temperature of 200° to 230° C.
Claim 13
Dependent Claim
11 words
A polyamide-imide resin composition containing the polyamide-imide resin of claim 1.
Claim 14
Dependent Claim
15 words
A polyamide-imide resin composition containing the polyamide-imide resin of claim 2, 3, 4 or 5.
Claim 15
Dependent Claim
11 words
A polyamide-imide resin composition containing the polyamide-imide resin of claim 8.
Claim 16
Dependent Claim
16 words
An electrical conductor having an insulating coating consisting essentially of the polyamide-imide resin of claim 1.
Claim 17
Dependent Claim
16 words
An electrical conductor having an insulating coating consisting essentially of the polyamide-imide resin of claim 8.
Claim 18
Dependent Claim
44 words
A polyamide-imide resin according to claim 2 or to claim 8 wherein the polyisocyanate containing isocyanurate rings is obtained by trimerization of the diisocyanate in a solvent which does not react with the isocyanate group and at a temperature of 50° to 160° C.
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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) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |