POLYAMIDE-IMIDE RESIN INSULATING COATING MATERIAL, INSULATED WIRE AND COIL
A polyamide-imide resin insulating coating material includes an polyamic acid having a thermally crosslinkable reactive group, and an amide compound having a thermally crosslinkable reactive group. The polyamic acid includes an acid synthesized using at least a diamine component, a tetracarboxylic dianhydride and a cross-linking agent as raw materials. The cross-linking agent includes an amino group or an anhydride group and a thermally crosslinkable reactive group. The amide compound includes a compound synthesized using at least a carboxylic acid compound and a diisocyanate component as raw materials. The carboxylic acid compound includes a thermally crosslinkable reactive group that is crosslinkable with the cross-linking agent contained in the polyamic acid.
1 . A polyamide-imide resin insulating coating material, comprising:
an polyamic acid having a thermally crosslinkable reactive group; and
an amide compound having a thermally crosslinkable reactive group,
wherein the polyamic acid comprises an acid synthesized using at least a diamine component, a tetracarboxylic dianhydride and a cross-linking agent as raw materials.
wherein the cross-linking agent comprises an amino group or an anhydride group and a thermally crosslinkable reactive group,
wherein the amide compound comprises a compound synthesized using at least a carboxylic acid compound and a diisocyanate component as raw materials, and
wherein the carboxylic acid compound comprises a thermally crosslinkable reactive group that is crosslinkable with the cross-linking agent contained in the polyamic acid.
2 . The polyamide-imide resin insulating coating material according to claim 1 , wherein the amide compound includes an imide group in a molecule thereof.
3 . The polyamide-imide resin insulating coating material according to claim 1 , wherein the amide compound comprises a compound synthesized using at least the carboxylic acid compound, the diisocyanate component and a trimellitic anhydride.
4 . The polyamide-imide resin insulating coating material according to claim 1 , wherein the amide compound has a number average molecular weight Mn of not more than 5000.
5 . The polyamide-imide resin insulating coating material according to claim 1 , wherein a weight ratio of the amide compound to the polyamic acid is from 99:1 to 30:70.
6 . The polyamide-imide resin insulating coating material according to claim 1 , wherein the cross-linking agent comprises a compound having an unsaturated double or triple bond as a thermally crosslinkable reactive group.
7 . The polyamide-imide resin insulating coating material according to claim 1 , wherein the cross-linking agent comprises maleic anhydride.
8 . The polyamide-imide resin insulating coating material according to claim 1 , wherein the polyamic acid is terminated by an anhydride group.
9 . The polyamide-imide resin insulating coating material according to claim 1 , wherein the polyamic acid is terminated by an amino group.
10 . An insulated wire, comprising:
a conductor, and
an insulating film comprising the polyamide-imide resin insulating coating material according to claim 1 and formed on the conductor or on another film on the conductor.
11 . A coil, comprising:
the insulated wire according to claim 10 .