Insulated wire

1. An insulated wire comprising a conductor and an insulation film made of polymer alloy around the conductor, wherein:

the polymer alloy consists essentially of an amorphous thermosetting resin and an amorphous thermoplastic resin;

the insulation film has a single-layered structure and a sea-island structure and is formed directly on the conductor;

the amorphous thermosetting resin is a polyamide-imide resin and is a sea component of the sea-island structure, the sea component is a continuous phase, and the amorphous thermosetting resin has an average molecular mass of 10,000 to 200,000; and

the amorphous thermoplastic resin is a polyetherimide resin and is an island component of the sea-island structure, the island component is a dispersed phase, the amorphous thermoplastic resin has an average molecular mass of 15,000 to 200,000, and the island component has an average diameter of less than 1 μm.

2. The insulated wire according to claim 1 , wherein

the polymer alloy contains 10 parts by mass to 150 parts by mass of the amorphous thermoplastic resin with regard to 100 parts by mass of the amorphous thermosetting resin.

3. The insulated wire according to claim 2 , wherein

the insulation film has a thickness of 1 μm to 200 μm.

4. An insulated wire comprising a conductor and an insulation film made of polymer alloy around the conductor, wherein:

the polymer alloy consists essentially of an amorphous thermoplastic resin and an amorphous thermosetting resin;

the insulation film is a single-layered structure and a sea-island structure and is formed directly on the conductor;

the amorphous thermosetting resin is a polyamide-imide resin having a repeat unit indicated by chemical formula 1, described below, and is a sea component of the sea-island structure, the sea component is a continuous phase, and the amorphous thermosetting resin has an average molecular mass of 10,000 to 200,000; and

the amorphous thermoplastic resin is a polyetherimide resin and is an island component of the sea-island structure, the island component is a dispersed phase, the amorphous thermoplastic resin has an average molecular mass of 15,000 to 200,000, and the island component has an average diameter of less than 1 μm,

wherein in chemical formula 1, R denotes aromatic diamines having a bivalent aromatic group having three or more aromatic rings, and n denotes the number of repetitions and is a positive integer.

5. The insulated wire according to claim 4 , wherein

the polyamide-imide resin having a repeat unit indicated by the chemical formula 1 is a polyamide-imide resin obtained by reacting imide-group-containing dicarboxylic acid, which is created by synthetically reacting a diamine component composed of aromatic diamines having a bivalent aromatic group having three or more aromatic rings with an acid component in an azeotropic solvent, with a diisocyanate component composed of aromatic diisocyanates.

6. The insulated wire according to claim 4 , wherein

the polymer alloy contains 10 to 150 parts by mass of the amorphous thermoplastic resin with regard to 100 parts by mass of the polyamide-imide resin having a repeat unit indicated by the chemical formula 1.

7. The insulated wire according to claim 4 , wherein

the insulation film has a thickness of 1 μm to 45 μm.

8. An insulated wire comprising:

a conductor and an insulation film made of polymer alloy, the insulation film being disposed directly on the conductor, the polymer alloy comprising a polyamide-imide resin as an amorphous thermosetting resin and a polyetherimide resin as an amorphous thermoplastic resin;

wherein:

the insulation film has a single-layered structure and a micro phase separation structure;

the polyamide-imide resin forms a continuous phase of the micro phase separation structure, the amorphous thermosetting resin has an average molecular mass of 10,000 to 200,000; and

the polyetherimide resin forms a dispersed phase of islands of the micro phase separation structure, the amorphous thermoplastic resin has an average molecular mass of 15,000 to 200,000, and the islands component has an average diameter of less than 1 μm.

9. The insulated wire according to claim 8 , wherein the polymer alloy contains 10 parts by mass to 150 parts by mass of the amorphous thermoplastic resin with regard to 100 parts by mass of the amorphous thermosetting resin.

10. The insulated wire according to claim 8 , wherein the insulation film has a thickness of 1 μm to 200 μm.