JP2936895B2 - Insulated wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated electric wire which is wound around a motor core and has excellent processing resistance.

[0002]

2. Description of the Related Art In recent years, with the trend of miniaturization and weight reduction of equipment, a motor having a smaller size, lighter weight and higher performance has been required. To meet this requirement, it is necessary to wind more insulated wires around the motor core, but the insulated wires will be forced into the slots in the core, and there is a risk of damaging the insulation coating during the winding process. is there. When the insulating coating is damaged, there is a problem that a layer failure, a ground failure, and the like occur, which causes a problem in electric characteristics of the motor.

[0003] Therefore, an insulated wire having an insulating film with excellent mechanical strength, usually formed by applying and baking a polyamideimide-based paint, is used for the above-mentioned applications. As the polyamideimide, the following formula (I)
The reaction product of diphenylmethane-4,4'-diisocyanate and trimellitic anhydride represented by I) is generally used (for example, JP-B-44-19274 and JP-B-45-27611). Etc.).

[0004]

Embedded image

[0005]

However, recently, there has been a demand for a motor having a smaller size, a lighter weight and a higher performance, and in order to cope with the demand, a winding amount of the insulated wire has been further increased. However, damage has been increasing. Therefore, in order to reduce the damage of the insulating film as much as possible, for example, it has been studied to add an organic or inorganic lubricant or the like to the paint to impart lubricity to the surface of the insulating film. However, damage to the insulating film cannot be fundamentally solved.

[0006] Although the occurrence of damage can be reduced by further improving the mechanical strength of the insulating coating, simply increasing the mechanical strength results in a coating that is rigid and inferior in flexibility, and is not suitable for bending an electric wire. There is a problem that the wire is easily broken or peeled, and the workability of the insulated wire is deteriorated. The present invention
It is an object of the present invention to provide an insulated electric wire which has excellent flexibility, has an insulating coating which is not easily damaged, and has excellent work resistance.

[0007]

Means for Solving the Problems and Actions In order to solve the above problems, the present inventors have studied the structure of polyamideimide, and as a result, the following general formula (I):

[0008]

Embedded image

[In the above formula, R ¹ and R ² are the same or different and each represent a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom. When the aromatic diisocyanate compound represented by the formula (1) is contained in a diisocyanate component as a raw material, and a biphenyl moiety is introduced into the structure of the polyamideimide, the elastic modulus of the insulating coating is improved and the insulating coating is excellent in flexibility. In addition, it has been found that an insulating film that is hardly damaged can be formed. Further, the content of the aromatic diisocyanate compound represented by the general formula (I) was further studied, and as a result, the present invention was completed.

That is, an insulated wire according to the present invention is an insulated wire having an insulating coating formed by applying and baking a polyamide-imide-based paint using at least a diisocyanate component and an acid component as raw materials, wherein the diisocyanate component as a raw material is as described above. It is characterized by containing the aromatic diisocyanate compound represented by the general formula (I) in a range of 30 to 80 mol%.

Specific examples of the aromatic diisocyanate compound represented by the general formula (I) among the diisocyanate components which are one of the raw materials of the polyamideimide-based paint include, for example, biphenyl-4,4'-diisocyanate, biphenyl- 3,3'-diisocyanate, biphenyl-
3,4'-diisocyanate, 3,3'-dichlorobiphenyl-4,4'-diisocyanate, 2,2'-dichlorobiphenyl-4,4'-diisocyanate, 3,
3'-dibromobiphenyl-4,4'-diisocyanate, 2,2'-dibromobiphenyl-4,4'-diisocyanate, 3,3'-dimethylbiphenyl-4,4 '
-Diisocyanate, 2,2'-dimethylbiphenyl-
4,4'-diisocyanate, 2,3'-dimethylbiphenyl-4,4'-diisocyanate, 3,3'-diethylbiphenyl-4,4'-diisocyanate, 2,
2'-diethylbiphenyl-4,4'-diisocyanate, 3,3'-dimethoxybiphenyl-4,4'-diisocyanate, 2,2'-dimethoxybiphenyl-4,
4'-diisocyanate, 2,3'-dimethoxybiphenyl-4,4'-diisocyanate, 3,3'-diethoxybiphenyl-4,4'-diisocyanate, 2,
2'-diethoxybiphenyl-4,4'-diisocyanate, 2,3'-diethoxybiphenyl-4,4'-diisocyanate and the like can be mentioned. These may be used alone or as a mixture of two or more.

Among the above aromatic diisocyanate compounds, from the viewpoint of availability, cost, etc., the following formula (I)
3,3'-dimethylbiphenyl-4 represented by a)
4'-Diisocyanate is most preferably used in the present invention.

[0013]

Embedded image

The other diisocyanate contained in the diisocyanate component together with the aromatic diisocyanate compound represented by the general formula (I) includes, for example, diphenylmethane-4,4'-diisocyanate, diphenylmethane-3,3'-diisocyanate, diphenylmethane-
3,4'-diisocyanate, diphenyl ether-
4,4'-diisocyanate, benzophenone-4,
4'-diisocyanate, diphenylsulfone-4,
4'-diisocyanate, tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate, m-
Various conventionally known diisocyanate compounds such as xylylene diisocyanate and p-xylylene diisocyanate are exemplified. These may be used alone or as a mixture of two or more.

Among the above diisocyanate compounds,
The diphenylmethane-4,4'-diisocyanate represented by the formula (II) is preferably used in terms of availability, cost, and the like. Examples of the acid component constituting the polyamideimide-based coating material together with the diisocyanate component include trimellitic acid, trimellitic anhydride, trimellitic acid chloride, and tribasic acids among trimellitic acid derivatives. In particular, trimellitic anhydride represented by the following formula (III) is preferably used in terms of availability, cost, and the like.

[0016]

Embedded image

The acid components include tetracarboxylic anhydrides and dibasic acids such as pyromellitic dianhydride, biphenyltetracarboxylic dianhydride, benzophenonetetracarboxylic dianhydride, and diphenylsulfonetetracarboxylic acid. Dianhydride, terephthalic acid, isophthalic acid, sulfoterephthalic acid, dicitric acid, 2,5-thiophenedicarboxylic acid, 4,5-phenanthenedicarboxylic acid, benzophenone-4,4'-dicarboxylic acid, phthaldiimide dicarboxylic acid, biphenyldicarboxylic acid Acid, 2,6-naphthalenedicarboxylic acid, diphenylsulfone-4,4'-
A part of dicarboxylic acid, adipic acid and the like may be added.

The ratio of the aromatic diisocyanate compound represented by the general formula (I) in the diisocyanate component is limited to the range of 30 to 80 mol% for the following reason. That is, when the proportion of the aromatic diisocyanate compound represented by the general formula (I) is less than 30 mol%, the effect of adding the aromatic diisocyanate compound is not obtained, and the insulating coating is likely to be damaged.
On the other hand, when the proportion of the aromatic diisocyanate compound represented by the general formula (I) exceeds 80 mol%, the insulating coating is rigid and inferior in flexibility, and easily breaks or peels.

The proportion of the aromatic diisocyanate compound represented by the general formula (I) in the diisocyanate component is within the above range, especially 30 to 60 mol%.
Is preferably within the range. When the proportion of the aromatic diisocyanate compound represented by the general formula (I) in the diisocyanate component is 60 to 80 mol%,
In order to maintain the flexibility of the insulating coating, the following formula (IV) is contained in the acid component:

[0020]

Embedded image

An acid having a bent structure in the molecule, such as isophthalic acid represented by
And more preferably in the range of 10 to 30 mol%. Examples of the acid having a bent structure in the molecule include o-phthalic acid, benzophenonedicarboxylic acid, diphenylsulfondicarboxylic acid, and diphenylmethanedicarboxylic acid, in addition to the above-mentioned isophthalic acid.

When the above acid is contained in the acid component as a raw material, a bent portion due to the above acid is generated in the structure of the polyamideimide, and the flexibility of the insulating film is improved. The ratio of the acid having a bent structure in the molecule is 5%.
If the amount is less than mol%, the effect of improving flexibility may not be sufficiently obtained, whereas if it exceeds 40 mol%, the general formula (I)
The effect of improving the elastic modulus by the addition of the aromatic diisocyanate compound represented by formula (1) is impaired, and the insulating coating may be easily damaged.

In order to produce a polyamideimide-based coating material used in the present invention from the above-mentioned diisocyanate component and acid component, for example, a substantially stoichiometric amount of diisocyanate component and acid component are mixed in a suitable organic solvent. A production method similar to that of a conventional polyamideimide-based coating material to be polymerized can be employed. More specifically, a diisocyanate component in which the aromatic diisocyanate compound represented by the general formula (I) is blended in the above-described ratio is mixed with an acid component in an approximately equimolar amount in a suitable organic solvent at a temperature of 0 to 180 ° C. From 1 to 24
When the reaction is performed for a time, a polyamideimide-based coating material in which polyamideimide, which is a copolymer of a diisocyanate component containing an aromatic diisocyanate compound and an acid component, is dissolved or dispersed in an organic solvent is obtained.

The polyamide-imide paint used in the present invention includes a polyamide-imide paint prepared by using an aromatic diisocyanate compound represented by the general formula (I) and an acid component as raw materials; A mixture of a diisocyanate compound other than the compound and a polyamideimide-based coating material produced using an acid component as a raw material can also be used. In this case, the mixing ratio of both paints is adjusted so that the ratio of the aromatic diisocyanate compound represented by the general formula (I) in the total diisocyanate component as a raw material falls within the range of 30 to 80 mol%. do it.

The polyamide-imide paint used in the present invention may further contain various additives such as pigments, dyes, inorganic or organic fillers and lubricants, if necessary. The insulated wire of the present invention is manufactured by applying the polyamideimide-based paint to the surface of the wire and baking to form an insulating film.

The thickness of the insulating coating is not particularly limited in the present invention, and can be formed to a thickness similar to that of the related art according to the size of the electric wire and the like. Under the insulation coating,
A base layer made of a material having good adhesion to the insulating coating and the electric wire may be provided. Examples of the base layer include insulating films formed by applying and baking various conventionally known insulating paints such as polyurethane, polyester, polyesterimide, polyesteramideimide, polyamideimide, and polyimide. Above all, from the viewpoint of adhesion to electric wires and insulating coatings or mechanical strength of the coatings, it is formed by applying and baking a polyamideimide paint containing diphenylmethane-4,4'-diisocyanate and trimellitic anhydride. The underlying layer is preferred.

The thickness of the underlayer is not particularly limited in the present invention. However, in consideration of the mechanical strength of the film, the ratio of the thickness of the insulating film to the thickness of the underlayer is in the range of 1/10 to 10/1. Is preferably within the range. A surface lubricating layer may be provided as an upper layer of the insulating coating in order to impart lubricity to the surface of the insulating coating.

As the surface lubricating layer, a coating film of paraffins such as liquid paraffin and solid paraffin can be used. However, in consideration of durability and the like, a lubricant such as various waxes, polyethylene, fluororesin, silicone resin or the like is used as a binder resin. A bound surface lubrication layer is more preferred.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An insulated wire according to the present invention will be described below based on examples and comparative examples. COMPARATIVE EXAMPLE 1 While flowing nitrogen gas at a rate of 150 ml / min from the above nitrogen blowing tube into a flask equipped with a thermometer, a cooling tube, a calcium chloride filled tube, a stirrer, and a nitrogen blowing tube, 10
8.6 g of trimellitic anhydride (hereinafter referred to as “TMA”) and 29.9 g of 3,3′-dimethylbiphenyl-
4,4'-diisocyanate (hereinafter referred to as "TODI") and 113.1 g of diphenylmethane-4,4'-
Diisocyanate (hereinafter referred to as "MDI") was charged. The ratio of TODI to total diisocyanate is 2
It was 0 mol%.

Next, 637 g of N-
Add methyl-2-pyrrolidone and stir with an agitator.
The mixture was heated at 0 ° C. for 3 hours, further heated to 140 ° C. over 3 hours, and then heated at 140 ° C. for 1 hour. And 1
After the time has passed, stop heating and allow to cool to 25% concentration
Was obtained. This polyamide-imide-based coating material was applied to the surface of a copper wire having a diameter of 1.0 mm and baked by a conventional method to prepare an insulated wire having an insulating coating having a thickness of 35 μm.

Example 1 TODI and MDI at the time of preparing a polyamideimide paint
Of TODI = 59.7 g, MDI = 84.
An insulated wire was produced in the same manner as in Comparative Example 1 , except that 8 g of TODI was 40 mol% of the total diisocyanate.

Example 2 TODI and MDI at the time of preparing a polyamideimide-based paint
Of TODI = 74.7 g, MDI = 70.
An insulated wire was produced in the same manner as in Comparative Example 1 except that 7 g of the TODI in the total diisocyanate was 50 mol%.

Example 3 TODI and MDI at the time of preparing a polyamideimide-based paint
Of TODI = 89.6 g, MDI = 56.
An insulated wire was produced in the same manner as in Comparative Example 1 except that 6 g of TODI was 60 mol% of the total diisocyanate.

Example 4 TODI and MDI at the time of preparing a polyamideimide-based paint
Of TODI = 112.0 g, MDI = 3
An insulated wire was produced in the same manner as in Comparative Example 1 except that 5.3 g and the proportion of TODI in the total diisocyanate was 75 mol%.

Comparative Example 2 TODI was not charged at the time of preparing a polyamide-imide paint,
Comparative Example 1 except that 141.4 g of MDI was charged.
In the same manner as in Example 1 , an insulated wire was produced. Comparative Example 3 MDI was not charged at the time of preparing a polyamide-imide paint,
The above comparative example except that 149.3 g of ODI was charged.
In the same manner as in Example 1 , an insulated wire was produced.

Example 5 Diphenylmethane-4,
Commercially available polyamide-imide paint containing 4'-diisocyanate and TMA (part number HI-400 manufactured by Hitachi Chemical Co., Ltd.)
Was applied and baked in a conventional manner to form a 17 μm-thick underlayer. Next, the same polyamide-imide paint as used in Example 2 was applied and baked on the underlayer by a conventional method to form an 18 µm-thick insulating film, thereby producing an insulated wire.

Example 6 A polyesterimide-based paint (Isomid 4 manufactured by Nisshin Schenectady Co., Ltd.) was coated on the surface of a copper wire having a diameter of 1.0 mm.
0-SH) is applied and baked in a conventional manner to give a film thickness of 10
A μm underlayer was formed. Next on the underlying layer, implemented
The same polyamideimide paint as used in Example 2 was applied and baked in a conventional manner to form an insulating film having a thickness of 25 μm, thereby producing an insulated wire.

The following tests were performed on the insulated wires of the above Examples and Comparative Examples. Appearance evaluation The appearance of the insulated wires of each of the above examples and comparative examples was visually observed. Elastic modulus measurement The copper wire was removed by etching from the insulated wires of Examples and Comparative Examples, and the remaining insulating film (length 6 cm) was pulled using a tensile tester at a chuck interval of 3 cm and a pulling speed of 1 mm / min. The elastic modulus (kg
/ Mm ² ).

Flexibility test The insulated wires of Examples and Comparative Examples are
When a plurality of round bars whose diameter gradually increases in steps of mm are sequentially applied, and the wire is bent in accordance with the outer shape of the round bar,
Cracking and peeling of the insulating film were observed, and the diameter d (mm) of the smallest round bar in which no abnormality was found in the insulating film was recorded.

Rapid Extension Cutting Test The insulated wires of Examples and Comparative Examples were rapidly pulled from both ends.
After sharply extending and cutting, the floating amount (mm) of the coating from the copper wire in the cut portion was measured. Piano wire damage load measurement Piano wires are superimposed perpendicularly to the insulated wires of Examples and Comparative Examples, and the piano wires are pulled out with various loads applied to the piano wires, and the load at which the insulation coating is damaged is recorded. did.

Table 1 shows the above results.

[0042]

[Table 1]

From the results shown in Table 1 above, Comparative Example 2 containing no TODI as a diisocyanate component , and TOD
In the insulated wire of Comparative Example 1 in which the content ratio of I was less than 30 mol%, the elastic modulus of the insulating coating was low, and the result of the piano wire damage load measurement showed that the insulating coating was easily damaged. On the other hand, the diisocyanate component is 100% TODI
In the insulated wire of Comparative Example 3 , it was found from the result of the flexibility test that the flexibility of the insulating film was poor, and from the result of the rapid stretching test, the insulating film was easily peeled from the copper wire.

On the other hand, all of the insulated wires of Examples 1 to 6 are hardly damaged and have excellent flexibility.
It was found to have an insulating coating that was difficult to peel off from the copper wire. Further, from the results of the above examples, the higher the proportion of TODI, the higher the elastic modulus of the insulating coating and the more difficult it is for the insulating coating to be damaged.
It was found that the lower the proportion of I, the better, and considering the balance between the two properties, Examples 1 to 3 , in which the proportion of TODI was in the range of 30 to 60 mol%, were particularly excellent.

Further, the second embodiment has the same TODI ratio as the second embodiment.
Comparing the results of Examples 5 and 6 , all of Examples 5 and 6 show that the floating amount of the insulating film in the rapid elongation cutting test is smaller than that of Example 2 , so that the formation of the underlying layer It was found that the adhesion of the film could be further improved while maintaining the characteristics as they were. One-way abrasion test For the insulated wires of Example 2 and Comparative Example 2 , JI
The unidirectional wear amount of the insulating coating was measured by the measuring method described in SC-3003 “Testing method for enameled copper wire and enameled aluminum wire”.

Measurement of dielectric breakdown voltage The insulated wires of Example 2 and Comparative Example 2 were measured by JI
The dielectric breakdown voltage of the insulating film was measured by the method described in SC-3003 “Test method for enameled copper wire and enameled aluminum wire”. Table 2 shows the above results.
The values in parentheses in the respective columns in the table represent the standard deviation values of the respective data.

[0047]

[Table 2]

[0048] From the results of Table 2, the insulating film in the insulated wire of Example 2, on the insulated wire of Comparative Example 2 is a conventional having a pressure resistance of the insulating coating and the same level, this
It was found that the abrasion resistance was superior to that of the insulating film in Comparative Example 2 . Comparative Example 4 MD prepared as a diisocyanate component in Comparative Example 2
The polyamide-imide paint containing only I and the polyamide-imide paint containing only TODI as a diisocyanate component prepared in Comparative Example 3 were mixed with TODI at the raw material stage.
And MDI were mixed at a molar ratio of TODI / MDI = 20/80, and sufficiently stirred and mixed to prepare a polyamideimide-based paint. Then, an insulated wire was produced in the same manner as in Comparative Example 1 using this polyamideimide-based paint.

Example 7 MD prepared as a diisocyanate component in Comparative Example 2
The polyamide-imide paint containing only I and the polyamide-imide paint containing only TODI as a diisocyanate component prepared in Comparative Example 3 were mixed with TODI at the raw material stage.
An insulated wire was produced in the same manner as in Comparative Example 4 except that the molar ratio of MDI to MDI was TODI / MDI = 50/50.

Example 8 MD prepared as a diisocyanate component in Comparative Example 2
The polyamide-imide paint containing only I and the polyamide-imide paint containing only TODI as a diisocyanate component prepared in Comparative Example 3 were mixed with TODI at the raw material stage.
An insulated wire was produced in the same manner as in Comparative Example 4 except that the molar ratio of MDI to MDI was TODI / MDI = 75/25.

With respect to the insulated wires of each of the above Examples and Comparative Examples , the above-described tests of appearance evaluation, elastic modulus measurement, flexibility test, rapid extension cutting test, and piano wire damage load measurement were performed. Table 3 shows the results.

[0052]

[Table 3]

From the results shown in Table 3 above, Comparative Example 4, Example
7 and Example 8 are comparative examples having the same TODI ratio, respectively.
1, Example 2 and Example 4 exhibit almost the same characteristics as those of Table 1 (see Table 1).
It was found that even when the mixture was prepared by mixing the one containing DI and the one not containing DI, almost the same result as that of the paint produced by copolymerization was obtained. Example 9 TODI and MDI at the time of preparing a polyamideimide-based paint
Of TODI = 135.8 g, MDI = 4
2.9 g, the proportion of TODI in the total diisocyanate was 75 mol%, and TMA and isophthalic acid (hereinafter referred to as “IPA”) were used as acid components.
The amount of MA and IPA charged was set to TMA = 127.7.
g, IPA = 3.7 g, and an insulated wire was produced in the same manner as in Comparative Example 1 , except that the ratio of IPA to the total acid component was 3 mol%.

Example 10 The preparation amounts of TMA and IPA at the time of preparing a polyamideimide-based coating material were as follows: TMA = 105.3 g, IPA = 22.8
g, an insulated wire was produced in the same manner as in Example 9 except that the ratio of IPA to the total acid component was 20 mol%. Example 11 The preparation amounts of TMA and IPA at the time of preparing a polyamideimide-based coating material were as follows: TMA = 72.4 g, IPΛ = 51.2
g, an insulated wire was produced in the same manner as in Example 9 except that the ratio of IPA to the total acid component was 45 mol%.

With respect to the insulated wires of each of the above examples, the above-described tests of the appearance evaluation, the elastic modulus measurement, the flexibility test, the rapid extension cutting test, and the piano wire damage load measurement were performed. The result, TO
Proportion of DI is the same, the actual proportion of IPA is 0 mol%
The results are shown in Table 4 together with the results of Example 4 .

[0056]

[Table 4]

From the results shown in Table 4, it was found that even if IPA was contained in the acid component, an insulated wire having almost the same properties as those not containing IPA could be formed. Also IP
When the proportion of A is more than 3 mol% and less than 45 mol%, it has been found that the elastic modulus and flexibility of the insulating coating can be improved while maintaining other properties as they are. Further, from the results of the above examples, when the proportion of IPA was 3 mol%, there was little change in the characteristics, and when the proportion of IPA was 45 mol%, the insulating coating was slightly easily damaged. In consideration of the balance, it was found that Example 10 in which the proportion of IPA was in the range of 5 to 40 mol% was particularly excellent.

Example 12 A baking type water-soluble lubricating paint (product number TEC-960 manufactured by Toshiba Chemical Co., Ltd.) was applied on the insulating film of the insulated wire prepared in Example 2.
An insulated wire was produced in the same manner as in Example 2 except that No. 1 was applied and baked in a conventional manner to form a surface lubricating layer. Example 13 Polytetrafluoroethylene 20 as a lubricant was added to 100 parts by weight of the polyamideimide-based paint prepared in Comparative Example 2.
A coating for a surface lubricating layer was prepared by adding parts by weight, and this was applied and baked on the insulating film of the insulated wire prepared in Example 2 by a conventional method, except that a surface lubricating layer was formed. An insulated wire was produced in the same manner as in Example 2 above.

With respect to the insulated wires of each of the above examples, the above-described tests of the appearance evaluation, the measurement of the elastic modulus, the flexibility test, the rapid extension cutting test, and the measurement of the damage load of the piano wire were performed. The result, TO
Table 5 shows the results together with the results of Example 2 in which the ratio of DI was the same and the surface lubricating layer was not formed on the insulating film.

[0060]

[Table 5]

From the results shown in Table 5, it was found that, when the surface lubricating layer was formed on the insulating film, the other characteristics could be maintained and the insulating film could be hardly damaged.

[0062]

According to the insulated wire of the present invention, the biphenyl moiety is introduced into the structure of the polyamideimide to improve the elastic modulus of the insulating film, so that the insulation is excellent in flexibility and hardly damaged. A coating can be formed. Therefore, the insulated wire of the present invention has excellent processing resistance,
For example, when used in motor windings, even if the winding dose to the core is increased, there is no risk of damage to the insulating coating during the winding process, and the demand for smaller, lighter, and higher-performance motors is met. can do.

Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI C08G 18/76 C08G 18/76 73/14 73/14 (56) References JP-A-58-80325 (JP, A) JP-A-59-1983 127313 (JP, A) JP-A-58-78319 (JP, A) JP-B-49-13308 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01B 7/02 C09D 179 / 08 H01B 3/30

Claims (7)

(57) [Claims] An insulated wire having an insulating coating formed by applying and baking a polyamide-imide-based paint using at least a diisocyanate component and an acid component as raw materials,
The diisocyanate component as a raw material has the following general formula (I): [In the above formula, R ¹ and R ² are the same or different and each represent a hydrogen atom, an alkyl group, an alkoxy group, or a halogen atom. 30 aromatic diisocyanate compound represented by]
An insulated electric wire characterized by being contained in the range of up to 80 mol%. 2. The insulated wire according to claim 1, wherein the content of the aromatic diisocyanate represented by the general formula (I) in the diisocyanate component as a raw material is 30 to 60 mol%. 3. The diisocyanate component as a raw material, wherein the content of the aromatic diisocyanate represented by the general formula (I) is 60 to 80 mol%, and the acid component is an acid having a bent structure in the molecule. The insulated wire according to claim 1, which is contained within a range of 5 to 40 mol%. 4. The polyamide-imide-based coating composition of the formula (I)
The insulated wire according to claim 1, wherein the insulated wire is produced by copolymerizing an aromatic diisocyanate represented by the formula, a diisocyanate other than the above, and an acid component. 5. The polyamide-imide-based coating composition of the formula (I)
A mixture of a polyamideimide-based coating material produced using an aromatic diisocyanate and an acid component represented by the following formula, and a polyamideimide-based coating material produced using other diisocyanate and an acid component as raw materials. Insulated wires. 6. A method according to claim 6, wherein diphenylmethane-
2. The insulated wire according to claim 1, further comprising a base layer formed by applying and baking a polyamide-imide-based paint containing 4,4'-diisocyanate and trimellitic anhydride. 7. The insulated wire according to claim 1, further comprising a surface lubricating layer on the insulating coating.