JP4569184B2 - Dielectric coating composition for hot melt coating and method for producing the same - Google Patents

Description

  The present invention relates to a dielectric paint composition for hot melt coating and a method for producing the same, and more particularly, to a dielectric paint composition for hot melt coating used for producing a ceramic green sheet (dielectric sheet) in a production process of a laminated part. The present invention relates to a product and a manufacturing method thereof. The dielectric sheet is obtained by peeling the support from the ceramic green sheet.

A representative example of a method for manufacturing a multilayer component such as a multilayer ceramic capacitor, a multilayer inductor, or a multilayer substrate is a sheet method. In the sheet method, a dielectric coating composition prepared from a dielectric powder, a binder (acrylic resin, butyral resin, etc.), a solvent (toluene, alcohol, methyl ethyl ketone, etc.), etc. on a support by a doctor blade method or the like. This is a method of forming a ceramic green sheet by coating and drying, and then laminating the green sheets on which the internal electrodes are printed in a card-type manner.
JP 2004-134808 A

  Incidentally, for example, the capacitance of a multilayer ceramic capacitor is determined by the dielectric constant of the material, the dielectric interlayer thickness, and the number of layers. Due to the recent reduction in size and thickness of electronic components, there are multilayer ceramic capacitors having a dielectric thickness of about 1 to 2 μm. For this reason, the green sheet thickness that determines the dielectric interlayer thickness must be formed into a thin sheet having a thickness of 2 μm or less.

  If the design of the dielectric coating composition is inappropriate for thin-layer sheets, the sheet strength will be weak, and it will be difficult to peel off the dielectric sheet from the support after green sheet molding, Further, the strength of the dielectric sheet is so weak that holes (defects) or the like are generated in the sheet, resulting in problems such as failure to obtain product characteristics.

  Generally, in order to increase the strength of the dielectric sheet, means such as increasing the amount of binder added or improving the dispersibility of the paint are employed. However, in the former case, an increase in the amount of binder added has an adverse effect on product properties due to poor sheet surface properties, and the amount of binder removed during firing increases, so cracks and cracks are likely to occur during firing. There is a problem that the manufacturing yield decreases. On the other hand, in the latter case, there is a limit in improving the strength of the dielectric sheet.

  The present invention has been made in view of the above circumstances, and its object has been improved by using a high-strength binder so as to obtain a high-strength dielectric sheet that can withstand practical use as a thin-layer sheet. It is an object to provide a dielectric coating composition for hot melt coating and a method for producing the same.

  That is, the first gist of the present invention comprises a dielectric powder, a polyolefin resin, a surfactant having HLB 4 to 12 as a dispersant, and a hydrocarbon solvent having a boiling point of 150 to 230 ° C. The ratio of each component to parts is 6 to 12 parts by weight of polyolefin resin, 0.5 to 1.5 parts by weight of a surfactant, 200 to 300 parts by weight of a hydrocarbon solvent, and a B-type rotational viscometer is used. It exists in the dielectric material coating composition for hot-melt coatings characterized by the viscosity measured at 50 degreeC being 50-150 cp.

And the 2nd summary of this invention is a manufacturing method of the dielectric material coating composition for hot-melt coatings of Claim 1, Comprising: The heat-kneading process (I) of a raw material component, and the obtained kneaded material of Including a crushing step (II) and a heating and mixing dilution step (III). use a 1.5 parts by weight, and a hydrocarbon solvent in an amount ratio of the total amount of the three components is 93 to 97% by weight relative to the total amount of these three components and the hydrocarbon solvent, the following formula In the heating and dilution step (III), a solution prepared in advance from the remaining polyolefin resin and hydrocarbon solvent is used for the crushing step ( The kneaded product obtained in II) is regulated by the following formula (1). The present invention resides in a method for producing a dielectric coating composition for hot melt coating, which comprises heating and diluting within a range of a predetermined temperature (T).

  According to the dielectric coating composition of the present invention, a dielectric sheet having a high strength (strength of 6 MPa or more) that can be practically used as a thin layer sheet can be obtained.

  First, the dielectric coating composition for hot melt coating of the present invention (hereinafter simply referred to as “composition”) will be described. The composition of the present invention comprises, as essential components, a dielectric powder, a polyolefin resin, a surfactant as a dispersant, and a hydrocarbon solvent.

  As the dielectric powder, for example, a powder of a complex oxide such as calcium titanate, strontium titanate or barium titanate (powder having an average particle diameter of 0.1 to 3.0 μm) is used. The dielectric powder may contain a known auxiliary agent made of an oxide such as yttrium, magnesium, manganese, vanadium.

  From the viewpoint of the strength of the resin, the weight average molecular weight of the polyolefin resin is usually 100,000 or more, preferably 500,000 or more, more preferably 2 million or more, and its upper limit is usually 5 million. As a kind of polyolefin resin, from the viewpoint of the strength of the resin, a polyolefin resin in which a main chain is composed of only a single bond without a large branched group (side chain group) having 2 or more carbon atoms is preferable. Therefore, for example, polyethylene and polypropylene are preferable to polymethylpentene and polybutadiene, and polyethylene is particularly preferable. Examples of polyethylene include low density polyethylene, high density polyethylene, linear low density polyethylene, and ultrahigh molecular weight polyethylene. In addition, when ethylene-vinyl acetate and polyamide are used instead of the polyolefin resin, these strengths are not sufficient and a high-strength dielectric sheet cannot be obtained.

  The surfactant used as the dispersant is HLB 4-12 (preferably 4-9, more preferably 4-6), and preferably has a thermal decomposition temperature of 150 ° C. or higher. Surfactants with too high HLB are poorly compatible with hydrocarbon solvents and hardly exhibit the effect as a dispersant, and surfactants with too low HLB have a low molecular weight and thus have a poor effect as a dispersant. A surfactant having a thermal decomposition temperature that is too low may be thermally decomposed during the production of the composition of the present invention to reduce the dispersion effect. The surfactant satisfying the above conditions is preferably selected from various nonionic surfactants. In the present invention, fatty acid ester-modified polyethylene glycol is recommended, and among them, a block copolymer comprising a block of units derived from a fatty acid ester and a block of units derived from ethylene glycol is preferred. As a commercial product of such a block type dispersant, “JP4” (HLB: 5.5, thermal decomposition temperature: 200 ° C.) manufactured by Unikema Co., Ltd. may be mentioned.

  A hydrocarbon solvent having a boiling point of 150 to 230 ° C. is used. Solvents having a boiling point that is too low evaporate during the production of the composition of the present invention, and solvents that have a boiling point that is too high take a long time to dry during the production of the ceramic green sheet, and the hydrocarbon solvent remains. Therefore, it is difficult to obtain a high-strength dielectric sheet.

The hydrocarbon solvent is usually selected from paraffin hydrocarbons, and specific examples thereof include n-nonane (151 ° C.), n-decane (174 ° C.), n-undecane (196 ° C.), n-dodecane ( 216 ° C.) and n-tridecane (230 ° C.). As the hydrocarbon solvent, those having a solubility parameter (SP) of 12 to 18 are preferable, and n-dodecane (SP: 15.5) is particularly preferable. Charcoal hydrocarbon solvent SP is too low often boiling point too high, a hydrocarbon solvent SP is too high is the poor solubility of the polyolefin resin. In addition, it is very difficult to dissolve the polyolefin resin with other solvents such as alcohol, ketone, ester and fatty acid.

  In the composition of the present invention, the proportions of the above components are as follows in terms of parts by weight per 100 parts by weight of the dielectric powder. That is, the polyolefin resin is 6 to 12 parts by weight, preferably 8 to 12 parts by weight, more preferably 10 to 12 parts by weight, the dispersant is 0.5 to 1.5 parts by weight, and the hydrocarbon solvent is 200 to 300 parts by weight. It is.

  When the proportion of the polyolefin resin is too small, the shape retention of the dielectric sheet is insufficient, and when it is too large, cracks occur when the dielectric sheet is molded. When the proportion of the dispersant is too small, the dispersion effect is insufficient. When the proportion is too large, the dispersant becomes excessive and the dispersants aggregate together, so that the dispersion state deteriorates. If the proportion of the hydrocarbon solvent is too small, it is difficult to dissolve the entire amount of the resin, and if it is too large, it takes a long time to dry the ceramic green sheet, and the hydrocarbon solvent tends to remain. It is difficult to obtain a high strength dielectric sheet.

  The composition of this invention is obtained as a uniform composition according to the manufacturing method mentioned later, for example. And the composition of this invention has the characteristic that the viscosity measured at 130 degreeC using a B-type rotational viscometer is 50-150 cp by the uniformity.

  Next, the manufacturing method of the composition concerning this invention is demonstrated. The production method of the present invention includes a heating and kneading step (I) of raw material components, a crushing step (II) of the obtained kneaded product, and a heating and mixing dilution step (III).

  The production method of the present invention includes the above three steps, and the significance of each step is as follows. That is, in the heat-kneading step (I), the dielectric powder and the polyolefin resin can be sufficiently dispersed by adopting the conditions described later. However, since the kneaded product obtained in the heating and kneading step (I) is a solid having no fluidity as a coating material, the coating material is obtained by secondary dispersion of the kneaded product in the heating and mixing dilution step (III). Turn into. Accordingly, the components can be dispersed and made into a paint by the heating and kneading step (I) and the heating and mixing dilution step (III). The crushing step (II) crushes the solid kneaded product obtained in the heating and kneading step (I) to an appropriate size, and contributes to the efficiency of the treatment in the heating and mixing dilution step (III). .

In the heating and kneading step (I), 100 parts by weight of dielectric powder, 3 to 5 parts by weight of a polyolefin resin, 0.5 to 1.5 parts by weight of a block type dispersant, these three components and a hydrocarbon solvent, proportion of the total amount of the three components is heat kneaded using the amount of hydrocarbon solvent comprising a 93 to 97% by weight relative to the total amount.

  When the proportion of polyolefin resin used in the heat-kneading step (I) is too small, sufficient shear (shearing force) is not applied to the material to be kneaded at the time of heat-kneading, and a sufficient dispersed state cannot be obtained. Is difficult to process in the crushing step (II) because the resulting kneaded product becomes too hard. If the proportion of the hydrocarbon solvent is too much greater than the range specified above, the viscosity will drop and sufficient share will not be applied to the material to be kneaded, and if it is too low, the material to be kneaded will be idle and sufficient share will be kneaded. It doesn't hang on things.

  In the heat-kneading step (I), it is necessary to perform heat-kneading treatment in the temperature (T) range defined by the following formula (1).

  If the temperature of the heat-kneading treatment is too lower than the above range, the polyolefin resin will not dissolve in the hydrocarbon solvent, and the share of the dielectric powder will be insufficient, and if it is too high, the polyolefin resin will not melt. As a result, the viscosity of the material to be kneaded is lowered and sufficient share is not applied to the material to be kneaded.

  The torque applied to the material to be kneaded is preferably in the range of 2 to 5 kg · m as an average value from the viewpoint of obtaining a good dispersion state. When the torque value is too high, the structure of the polyolefin resin may be divided and the strength as a binder may be reduced. The above torque can be easily measured by a torque meter provided in the kneading equipment.

  As long as the kneading process is possible, the kind of equipment used in the heat-kneading step (I) is not limited, and various kinds of equipment called so-called kneaders can be used. For example, Labo Plast Mill manufactured by Toyo Seiki Seisakusho Co., Ltd. is easy to disassemble the drive unit, is equipped with a torque meter, and is suitable as a heatable kneader.

  In the crushing step (II), the kneaded product obtained in the heating and kneading step (I) is crushed. In the present invention, crushing is a concept that uses a blade and includes cutting. As equipment used in the heating and kneading step (I), various kinds of equipment in which a crushing / cutting mechanism is configured by a rotating shaft, a rotating screw, a rotating blade, a rotating rotor, or the like can be used. The degree of crushing of the kneaded material is appropriately selected in consideration of the processing efficiency in the heating and dilution step (III) of the next step.

  In the heating and mixing dilution step (III), the kneaded product obtained in the crushing step (II) is mixed and diluted using a solution prepared in advance from the remaining polyolefin resin and hydrocarbon solvent.

  In the heating and mixing dilution step (III), it is necessary to perform the heating and mixing treatment within the range of the temperature (T) defined in the above formula (1). When the temperature of the heating and mixing treatment is too lower than the above range, the polyolefin resin is not dissolved in the hydrocarbon solvent, and when it is higher than the above range, the polyolefin resin is decomposed and the strength of the dielectric sheet is lowered.

  The equipment used in the heating and mixing dilution step (III) is not limited as long as mixing and dispersion treatment is possible, but it is preferable to use any one of a homogenizer, a Henschel mixer, and a planetary mixer. Lee mixer is preferred. The planetary mixer has a strong shearing force between the blades and the inner surface of the tank and the tank due to the rotation and revolution (planetary movement) of the two frame-type blades. It is a mixer with.

  The composition of the present invention is suitably used as a dielectric coating composition in the production of a ceramic green sheet required in the production process of a multilayer ceramic electronic component such as a multilayer ceramic capacitor. Specifically, a ceramic green sheet can be produced by hot melt coating the dielectric coating composition on the surface of the support and then drying. Hot melt coating can be performed, for example, by using a melt extruder, heating the composition of the present invention, casting it to a predetermined thickness from a T-die on a support, and solidifying it. Under the present circumstances, as the heating temperature of the composition of this invention, the range of the temperature (T) prescribed | regulated to said Formula (1) is selected normally. When the heating temperature of the composition at the time of hot melt coating is too low, the polyolefin resin is precipitated and a uniform dielectric layer cannot be obtained, and when it is too high, the polyolefin resin is thermally decomposed and deteriorated. By using the composition of the present invention, a dielectric sheet having high strength (strength of 6 MPa or more) that can be practically used as a thin layer sheet can be obtained.

  EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to a following example, unless the summary is exceeded. In the following examples, the following materials, equipment, and evaluation methods were used.

<Material>

(1) Dielectric powder:
A dielectric powder prepared by the following method was used. That is, BaTiO ₃ (average particle size 0.2 μm / “BT02 powder” manufactured by Sakai Chemical Industry Co., Ltd.) is used as the main component of the dielectric material, and Y ₂ O ₃ : 2 with respect to 100 mol of the main component as a subcomponent. mol, MgO: 2 mol, MnO: 0.4 _moles, V ₂ O 5: 0.1 _{mole, (Ba 0.6 Ca 0.4) SiO} 3: using 3 mol. First, 100 parts by weight of the above dielectric material, 1 part by weight of a polymer dispersant (“SN5468” manufactured by San Nopco) and 100 parts by weight of ethanol are put together with zirconia balls (2 mmφ) into a polyethylene container and mixed for 16 hours to form a dielectric. A body mixture solution was obtained. Next, the dielectric mixed solution was dried at a drying temperature of 120 ° C. for 12 hours to obtain a dielectric powder.

(2) Polyethylene resin (PE):
The resins listed in Table 1 below were used (the “resin melting point” in Table 1 is an actual measurement value by a measurement method described later).

(3) Block type dispersant:
Fatty acid ester-modified polyethylene glycol ("JP4" manufactured by Unikema Co., Ltd., HLB: 5.5, thermal decomposition temperature: 200 ° C)

<Equipment used>

(1) Heating kneader:
A lab plast mill "Roller mixer R60 type" manufactured by Toyo Seiki Seisakusho was used. The specifications are as shown in Table 2.

(2) Cutter:
A home mixer with a rotating cutting blade at the bottom was used.

(3) Planetary mixer:
A planetary mixer “DALTON” (model number: 5DMV-01-R) manufactured by Sanei Seisakusho was used.

<Method for measuring physical properties>

(1) Melting point of resin:
Using TG-DTA measurement (“TG-DTA2000” manufactured by MAC-SCIENCE), the melting point of the resin was measured as follows. Weigh 30 mg of resin in a Pt container, use aluminum oxide as a reference material, raise the temperature in the atmosphere at a rate of 200 ° C./hour, read the endothermic reaction peak in the measurement temperature range from room temperature to 400 ° C. Calculate the melting point.

(2) Viscosity of dielectric composition:
Measurement was performed at 130 ° C. using a B-type rotational viscometer (rotor number: S21) manufactured by Tokyo Keiki Co., Ltd.

(3) Strength of dielectric sheet:
Using a tensile tester (“INSTRON 5543” manufactured by Instron), measurement was performed under the conditions of a tensile speed of 8 mm / min and a jig gap of 5 mm, and the value with the maximum breaking stress was defined as the strength of the dielectric sheet. And the evaluation evaluation of intensity | strength was performed as follows. In other words, the strength of a conventional dielectric sheet (products using a butyral resin as a binder) is usually 4 MPa, determined the strength of the sheet in terms of whether withstand practical use as a thin layer sheet, the sheet strength 6MPa Less than that was judged to be difficult to use, and those having a sheet strength of 6 MPa or more were judged to be usable. Those of less than 6 MPa are represented as (×), and those of 6 MPa or more are represented as (◯).

Examples 1-6:
First, 100 parts by weight of dielectric powder, 4 parts by weight of a polyolefin resin listed in Table 3, and 1 part by weight of a surfactant (block type dispersant) are put in a heating kneader and pre-kneaded for 15 minutes, and then n -7.5 parts by weight of dodecane was added and kneaded by heating at 130 ° C for 1 hour. At this time, the ratio of the total amount of the three components to the total amount of the dielectric powder, the polyolefin resin, the surfactant, and the three components and n-dodecane was 93% by weight. The torque applied to the material to be kneaded was 4 kg · m. After heating and kneading, the blade was removed, and a substantial amount of the kneaded material was recovered. However, when low density polyethylene was used, the heating temperature was 110 ° C.

  Next, the kneaded product was cut using a cutter. The cut kneaded material (A) was, on average, a lump having a cross section of approximately 1 mm square and a length of 5 to 10 mm.

  On the other hand, 2 parts by weight of polyolefin resin was added to 200 parts by weight of n-dodecane in a planetary mixer and heated and mixed at 130 ° C. to prepare a solution (B). Subsequently, the mixture (A) was added in small portions to the solution (B) at a temperature of 130 ° C. and mixed by heating to dilute the mixture (A) to obtain a dielectric coating composition. However, when low density polyethylene was used, the heating temperature was 110 ° C. The viscosity at 130 ° C. of the obtained dielectric coating composition was as shown in Table 3.

Next, using a biaxial melt extrusion molding machine (“2D20S” manufactured by Toyo Seiki Co., Ltd.), a dielectric coating composition is supported from a T die (“T60F” manufactured by Toyo Seiki Co., Ltd.) at a temperature of 130 ° C. (thickness). A dielectric layer was formed by casting on a 75 μm biaxially stretched polyester film), and further dried using a homemade oven at 130 ° C. for 20 minutes to obtain a ceramic green sheet. As for the thickness of the dielectric layer, the gap of the T die was adjusted so that the thickness after drying was 8 μm. However, when low density polyethylene was used, both the casting temperature and the drying temperature were 110 ° C. Next, the strength of the dielectric sheet peeled from the support was measured. The results are shown in Table 3.

Comparative Examples 1 to 4 (Influence by the type of solvent):
In a heating kneader, 100 parts by weight of dielectric powder, 4 parts by weight of ultra high molecular weight PE (3) and 1 part by weight of a surfactant (block type dispersant) were pre-kneaded for 15 minutes. 7.5 parts by weight of the solvent described above was added and kneaded by heating at 130 ° C. for 1 hour. In any case, it was impossible to disperse the ultra-high molecular weight PE (3), and the processing after the next step had to be interrupted. Also, the viscosity could not be measured.

Comparative Example 5 (Effect of presence or absence of heating kneading step):
In a planetary mixer, 207.5 parts by weight of n-dodecane is added, 100 parts by weight of dielectric powder, 6 parts by weight of ultra high molecular weight PE (3), and 1 part by weight of a surfactant (block type dispersant). After adding in small portions sequentially, mixing was performed at 130 ° C. for 1 hour to obtain a dielectric coating composition having the same composition as in Example 6 (the viscosity at 130 ° C. of the dielectric coating composition was 200 cp). Next, after obtaining a ceramic green sheet under the same conditions as in Example 1, the strength of the dielectric sheet peeled off and recovered from the support was measured. The strength of the sheet was 5.0 MPa, and it was not at a level that could practically endure as a thin layer sheet.

Comparative Example 6 (effect of composition in heating kneading process):
First, 100 parts by weight of dielectric powder, 4 parts by weight of ultra-high molecular weight PE (3), and 1 part by weight of a surfactant (block type dispersant) are pre-kneaded for 15 minutes in a heating kneader, and then n -Add 3.0 parts by weight of dodecane and heat knead at 130 ° C for 1 hour. At this time, the ratio of the total amount of the three components to the total amount of the three components of the dielectric powder, the polyolefin resin, and the surfactant and n-dodecane was 97% by weight. Further, the torque applied to the material to be kneaded was 1.5 kg · m. After heating and kneading, the blade was removed, and a substantial amount of the kneaded material was recovered.

  Next, the kneaded product was cut using a cutter. The cut kneaded material (A) was, on average, a lump having a cross section of approximately 1 mm square and a length of 5 to 10 mm.

  On the other hand, 2 parts by weight of polyolefin resin was added to 204.5 parts by weight of n-dodecane in a planetary mixer and heated and mixed at 130 ° C. to prepare a solution (B). Subsequently, the mixture (A) is added in small portions to the solution (B) at a temperature of 130 ° C. and mixed by heating to dilute the mixture (A). A composition was obtained. The viscosity of the obtained dielectric coating composition at 130 ° C. was 180 cp).

Next, after obtaining a ceramic green sheet under the same conditions as in Example 1, the strength of the dielectric sheet peeled off and recovered from the support was measured. The strength of the sheet was 3.2 MPa, and it was not at a level that could practically endure as a thin layer sheet.

Comparative Examples 7 and 8 (Influence of temperature in the heating and kneading step):
In Example 6, the same procedure as in Example 6 was followed except that the temperature during the heat-kneading process in the heating kneader was changed to 100 ° C. (Comparative Example 7) or 160 ° C. (Comparative Example 8). Preparation, ceramic green sheet preparation, and dielectric sheet strength measurement. The strength in the case of Comparative Example 7 was 3.8 MPa, and the strength in the case of Comparative Example 8 was 3.1 MPa, which was not a level that could be practically used as a thin layer sheet. Incidentally, the viscosity at 130 ° C. of the dielectric coating composition was 200 cp for Comparative Example 7 and 40 cp for Comparative Example 8.

Comparative Example 9 (Influence of presence or absence of heating dilution mixing step):
In a heating kneader, 100 parts by weight of dielectric powder, 4 parts by weight of ultra high molecular weight PE (3) and 1 part by weight of a surfactant (block type dispersant) were pre-kneaded for 15 minutes, and then n-dodecane. 7.5 parts by weight were added and kneaded by heating at 130 ° C. for 1 hour. The obtained kneaded material was directly used as a dielectric coating composition, and an attempt was made to produce a ceramic green sheet under the same conditions as in Example 1. As a result, the fluidity of the dielectric coating composition was so poor that it could not be cast uniformly from the T die. Incidentally, the viscosity at 130 ° C. of the dielectric coating composition was not measurable.

Comparative Examples 10 and 11 (Influence of temperature in the heating and mixing dilution process):
In Example 6, the same operation as in Example 6 was performed except that the temperature at the time of the heating and mixing dilution process in the planetary mixer was changed to 100 ° C. (Comparative Example 10) or 160 ° C. (Comparative Example 11). Preparation of the coating composition, preparation of a ceramic green sheet, and measurement of the strength of the dielectric sheet were performed. Strength in Comparative Example 10 is 3.2 MPa, the strength of the case of Comparative Example 11 is 2.7 MPa, was not a level able to withstand practical use as a thin layer sheet. Incidentally, the viscosity at 130 ° C. of the dielectric coating composition was 200 cp for Comparative Example 10 and 40 cp for Comparative Example 11.

Claims (11)

  Dielectric powder, polyolefin resin, HLB 4-12 surfactant as dispersant, hydrocarbon solvent having a boiling point of 150-230 ° C. The ratio of each component to 100 parts by weight of dielectric powder is polyolefin resin 6 ~ 12 parts by weight, surfactant 0.5-1.5 parts by weight, hydrocarbon solvent 200-300 parts by weight, viscosity measured at 130 ° C using a B-type rotational viscometer is 50-150 cp A dielectric paint composition for hot-melt coating, characterized in that:   The dielectric coating composition according to claim 1, wherein the polyolefin resin has a weight average molecular weight of 100,000 to 5,000,000.   The dielectric coating composition according to claim 1 or 2, wherein the polyolefin resin is polyethylene. The dielectric coating composition according to any one of claims 1 to 3, wherein the thermal decomposition temperature of the surfactant is 150 ° C or higher. The dielectric coating composition according to any one of claims 1 to 4 the surfactant is a nonionic surfactant.   The dielectric coating composition according to claim 5, wherein the nonionic surfactant is a fatty acid ester-modified polyethylene glycol.   7. The dielectric coating composition according to claim 6, wherein the fatty acid ester-modified polyethylene glycol is a block copolymer comprising a block of units derived from a fatty acid ester and a block of units derived from ethylene glycol.   The dielectric constant coating composition according to any one of claims 1 to 7, wherein the solubility parameter (SP) of the hydrocarbon solvent is 12 to 18. It is a manufacturing method of the dielectric-coating composition for hot-melt coatings of Claim 1, Comprising: The heat-kneading process (I) of a raw material component, the crushing process (II) of the obtained kneaded material, and a heating mixing dilution process ( In the heating and kneading step (I), the dielectric powder is 100 parts by weight, the polyolefin resin is 3 to 5 parts by weight, the surfactant is 0.5 to 1.5 parts by weight, and these 3 temperature ratio of the total amount of the three components to the total amount of the component and the hydrocarbon solvent used and the amount of hydrocarbon solvent comprising a 93 to 97% by weight, defined by the following equation (1) (T) In the heating and mixing dilution step (III), the kneaded product obtained in the crushing step (II) using a solution prepared in advance from the remaining polyolefin resin and hydrocarbon solvent is used as follows. Heat mixing in the temperature (T) range specified in equation (1). A method for producing a dielectric coating composition for hot melt coating, characterized by comprising diluting together.
The production method according to claim 9 , wherein an average torque applied to the material to be kneaded in the heat-kneading step (I) is 2 to 5 kg · m. The production method according to claim 9 or 10 , wherein any one of a homogenizer, a Henschel mixer, and a planetary mixer is used in the heating and mixing dilution step (III).