JPH07102063A - Production of polyeserimide, and heat-resistant composition and insulated wire - Google Patents

Abstract

PURPOSE:To produce a polyesterimide which gives a heat-resistant resin compsn. which is excellent in heat resistance and solderability and can be soldered in a short time and to provide a heat-resistant resin compsn. and an insulated wire using the polyesterimide. CONSTITUTION:A polyesterimide is produced by thermally reacting an alcohol component contg. 5-50equivalent.% cyclic glycol with an acid component contg. 10-70equivalent.% imidated polycarboxylic acid. A heat-resistant resin compsn. contains the polyesterimide. The compsn. is applied to a conductor and baked to give an insulated wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyesterimide, a heat resistant resin composition, and more particularly to a heat resistant resin composition excellent in heat resistance and solderability, and an insulated wire using the same. .

[0002]

2. Description of the Related Art With the recent miniaturization and higher performance of electric devices, the performance required for wire enamel has increased, and there has been a demand for wire enamel having high heat resistance.
Also, in order to rationalize the productivity of electric equipment parts, demand for solderable wire enamel, which is easy to handle, is increasing. In response to these market needs, a solderable polyesterimide having good heat resistance and solderability has been developed and put into practical use. However,
The above solderability polyesterimide has excellent heat resistance, but is inferior in solderability, and the time required for soldering at 450 ° C. is as long as 5 to 6 seconds, and the effect of rationalizing production is insufficient. .

[0003]

The present invention solves the above-mentioned problems of the prior art and produces a heat-resistant resin composition having high heat resistance, excellent solderability, and capable of soldering in a short time. The present invention provides a method for producing a polyesterimide, a heat-resistant resin composition using the same, and an insulated wire using the same.

[0004]

The present invention is a polyesterimide in which an alcohol component containing 5 to 50 equivalent% of a cyclo ring-containing glycol and an acid component containing 10 to 70 equivalent% of an imide group-containing polycarboxylic acid are reacted by heating. , A heat-resistant resin composition containing the polyesterimide, and an insulated electric wire obtained by coating and baking the composition on a conductor.

In the present invention, the polyester imide is
It is obtained by heating and reacting an alcohol component containing 5 to 50 equivalent% of a cyclo ring-containing glycol and an acid component containing 10 to 70 equivalent% of an imide group-containing polycarboxylic acid. Examples of the cyclo ring-containing glycol include 1,4-cyclohexanedimethanol, 1,4-cyclohexanediethanol, 1,3-cyclopentanedimethanol and the like. Of these, 1,4-cyclohexanedimethanol is preferred. The amount of the cyclo ring-containing glycol used is 5 to 50 equivalent%, preferably 10 to 30 equivalent% of the alcohol component. If the amount used is less than 5%, the solderability of the resulting composition will be poor, and if it exceeds 50 equivalent%, the heat resistance will decrease.

Examples of alcohol components other than the cyclo ring-containing glycol include dihydric alcohols such as ethylene glycol, diethylene glycol and propylene glycol, and trihydric or higher alcohols such as glycerin, tris-2-hydroxyethyl isocyanurate and pentaerythritol. To be From the viewpoint of improving heat resistance, it is preferable to use a large amount of trihydric or higher alcohol, but if the amount of trihydric or higher alcohol is too high, the flexibility decreases. 30-8 of ingredients
It is preferably in the range of 0 equivalent%. Examples of the imide group-containing polycarboxylic acid include those represented by the general formula (1)

[0007]

[Chemical 1]

(Wherein R ₁ is a trivalent organic group, R ₂
Represents a divalent organic group and R ₃ represents a trivalent organic group). General formula (1)
The imidodicarboxylic acid represented by can be obtained, for example, by reacting 2 mol of tricarboxylic acid anhydride with 1 mol of diamine or diisocyanate. The tricarboxylic acid anhydride and the diamine or diisocyanate may be added at the time of producing the polyester imide without previously forming the imido dicarboxylic acid. As the tricarboxylic acid anhydride, trimellitic acid anhydride, 3,4,4'-benzophenone tricarboxylic acid anhydride, 3,4,4'-biphenyltricarboxylic acid anhydride or the like is used. As a diamine,
Diaminodiphenylmethane, diaminodiphenyl ether, diaminodiphenyl sulfone, m-xylylenediamine, p-xylylenediamine and the like are used. As the diisocyanate, diphenylmethane diisocyanate, tolylene diisocyanate, xylylene diisocyanate and the like are used.

The amount of the imide group-containing polycarboxylic acid used is 10 to 70 equivalent%, preferably 30 to 50 equivalent% of the acid component.
It is said that If the amount used is less than 10 equivalent%, the solderability of the resulting composition will be poor, and if it exceeds 70 equivalent%, stirring will be difficult unless a large amount of synthetic solvent is used during the synthesis, resulting in poor economic efficiency. As the acid component other than the imide group-containing polycarboxylic acid, terephthalic acid, isophthalic acid, dimethyl terephthalate, trimellitic anhydride, pyromellitic anhydride, benzophenonetetracarboxylic acid, or the like is used.

The mixing ratio of the alcohol component and the acid component is not particularly limited, but from the viewpoint of flexibility and heat resistance, the equivalent ratio of the hydroxyl group to the carboxyl group is 1.2 to 2.4.
It is preferable to set it to 1.4, and it is more preferable to set it to 1.4 to 1.8. The method for producing the polyesterimide is not particularly limited, and for example, an alcohol component containing 1,4-cyclohexanedimethanol and an acid component containing an imide group-containing polycarboxylic acid in the above proportion in the presence of an esterification catalyst
It can be performed by heating and reacting at a temperature of 70 to 250 ° C. Moreover, since the viscosity at the time of synthesis is high, it is preferable to perform the synthesis in the coexistence of a cresol-based solvent such as phenol, cresol, or xylenol.

In the synthesis, hydrocarbons can also be used in order to quickly remove the produced water from the reaction system by the azeotropic distillation method. To further promote the above reaction, titanic acid esters such as tetrabutyl titanate, tin compounds such as dibutyltin oxide, zinc acetate, lead acetate, organometallic salts such as zinc propionate can be added, and usually, The addition amount of these is 2% by weight or less based on the total amount of the reaction components.

In addition to the above polyester imide, a curing agent such as tetrabutyl titanate may be added to the heat-resistant resin composition of the present invention, if necessary, and the aromatic carboxylic acids zinc, lead and manganese may be added. You may add metal salts, such as. The heat-resistant resin composition of the present invention, by a known method on the conductor, by coating and baking,
It is possible to obtain an insulated electric wire having excellent properties such as flexibility and heat resistance and having excellent solderability.

[0013]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
In addition,% in an example means weight%. Example 1 1 liter 4 with thermometer, stirrer and condenser
In a one-necked flask, 7,4 g of 4,4'-diaminodiphenylmethane, 161.9 g of trimellitic anhydride, 117.4 g of dimethyl terephthalate, 24.5 g of 1,4-cyclohexanedimethanol, 73.2 g of glycerin, and 21 ethylene glycols were added. 0.1 g, cresol 158.1 g, and tetrabutyl titanate 0.4 g were added, and the temperature was raised to 170 ° C. in a nitrogen stream to react for 2 hours. The compounding ratio (equivalent%) of the acid component and the alcohol component at this time is shown in Table 1. The imidodicarboxylic acid in Table 1 is shown in the amount expected to be produced from 4,4'-diaminodiphenylmethane and trimellitic anhydride (the same applies to the following examples).
Further, trimellitic anhydride in Table 1 shows an amount that does not participate in the formation of imidodicarboxylic acid. Then, the obtained solution was heated to 215 ° C. and reacted for 6 hours to synthesize polyesterimide. Cresol 442.
0 g was added, and 16.0 g of tetrabutyl titanate and 3.3 g of zinc naphthenate (metal content 6%) were added to obtain a polyesterimide resin liquid having a nonvolatile content of 40%.

Example 2 1 liter 4 with thermometer, stirrer and condenser
In a one-necked flask, 4,4'-diaminodiphenylmethane 69.9 g, trimellitic anhydride 135.6 g, dimethyl terephthalate 127.2 g, 1,4-cyclohexanedimethanol 67.5 g, glycerin 67.1 g, cresol 155. 8 g and tetrabutyl titanate 0.
4 g was added, and the temperature was raised to 170 ° C. in a nitrogen stream to react for 2 hours. The compounding ratio (equivalent%) of the acid component and the alcohol component at this time is shown in Table 1. The resulting solution is then added to 2
The temperature was raised to 15 ° C. and the reaction was performed for 6 hours to synthesize polyesterimide. Cresol 444.0 was added to the obtained resin solution.
g was added, and 16.0 g of tetrabutyl titanate and 3.3 g of zinc naphthenate (metal content 6%) were added to obtain a polyesterimide resin liquid having a nonvolatile content of 40%.

Comparative Example 1 1 liter 4 equipped with a thermometer, stirrer and condenser
In a three-necked flask, 4,4'-diaminodiphenylmethane 70.0 g, trimellitic anhydride 135.7 g, dimethyl terephthalate 160.0 g, glycerin 56.0 g,
Ethylene glycol 56.6 g, cresol 159.4
g and 0.4 g of tetrabutyl titanate were added, and the temperature was raised to 170 ° C. in a nitrogen stream to react for 2 hours. Table 1 shows the mixing ratio (equivalent%) of the acid component and the alcohol component at this time.
It was shown to. Then, the obtained solution was heated to 210 ° C. and reacted for 8 hours to synthesize polyesterimide. To the obtained resin solution, 440.0 g of cresol was added, and 16.0 g of tetrabutyl titanate and 3.3 g of zinc naphthenate (metal content 6%) were added to obtain a polyesterimide resin solution having a nonvolatile content of 40%.

Comparative Example 2 1 liter 4 equipped with a thermometer, stirrer and condenser
In a one-necked flask, 4,4'-diaminodiphenylmethane 83.9 g, trimellitic anhydride 162.8 g, dimethyl terephthalate 123.4 g, glycerin 70.5 g,
Ethylene glycol 30.6g, cresol 157.1
g and 0.4 g of tetrabutyl titanate were added, and the temperature was raised to 170 ° C. in a nitrogen stream to react for 2 hours. Table 1 shows the mixing ratio (equivalent%) of the acid component and the alcohol component at this time.
It was shown to. Next, the obtained solution was heated to 210 ° C. and reacted for 6 hours to synthesize polyesterimide. To the obtained resin solution, 443.0 g of cresol was added, and 16.0 g of tetrabutyl titanate and 3.3 g of zinc naphthenate (metal content 6%) were added to obtain a polyesterimide resin solution having a nonvolatile content of 40%.

[0017]

[Table 1]

<Test Example> Examples 1 and 2 and Comparative Example 1,
The polyesterimide resin solution obtained in 2 was applied to a copper wire having a diameter of 0.4 mm according to the baking conditions shown below and baked at a linear speed of 40 m / min to produce insulated wires. [Baking conditions] Baking furnace: Horizontal hot-air circulation furnace (furnace length 3.5 m) Furnace temperature: Inlet / outlet = 500 ° C / 500 ° C General characteristics of the obtained wire enamel (flexibility, thermal shock resistance, dielectric breakdown) Voltage, dielectric breakdown voltage after deterioration, softening resistance and solderability) were measured according to JIS C 3003, and the results are shown in Table 2.

[0019]

[Table 2]

From Table 2, the insulated electric wires obtained in Examples 1 and 2 exhibited excellent heat resistance such as softening resistance and the like as compared with the insulated electric wires obtained in Comparative Examples 1 and 2. The solderability was shortened from 5 to 6 seconds in Comparative Examples 1 and 2 to 2 seconds, which shows that the soldering work process can be shortened to 1/3.

[0021]

EFFECTS OF THE INVENTION The heat-resistant resin composition of the present invention exhibits heat resistance and various characteristics almost equivalent to those of conventional products, and has excellent solderability, so that the soldering work step is significantly shortened and insulation is performed. It is very useful industrially because it can produce electric wires.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Uchiyama 4-13-1, Higashimachi, Hitachi City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Yamazaki Factory

Claims (4)

[Claims] 1. A process for producing a polyesterimide, which comprises reacting an alcohol component containing 5 to 50 equivalent% of a cyclo ring-containing glycol with an acid component containing 10 to 70 equivalent% of an imide group-containing polycarboxylic acid by heating. . 2. The method for producing a polyesterimide according to claim 1, wherein the cyclo ring-containing glycol is 1,4-cyclohexanedimethanol. 3. A heat-resistant resin composition containing the polyesterimide according to claim 1. 4. An insulated electric wire obtained by applying and baking the heat resistant resin composition according to claim 3 on a conductor.