Composition, sheet-like material, laminate, method for manufacturing the composition, and chip-type multilayer electronic component

Abstract

To provide a composition that has a low environmental impact and possesses plasticity suitable for forming sheet-like materials. [Solution] A composition comprising an inorganic powder, a binder resin, and a plasticizer, wherein the plasticizer comprises a compound having a structure represented by the following general formula (1). TIFF2026058033000016.tif44156 (In the formula, R 1 , R 2 This refers to a hydrocarbon group with 1 to 12 carbon atoms. 3 These include H, hydroxyl groups, carboxyl groups, ester groups with 2 to 12 carbon atoms, and acyl groups with 2 to 12 carbon atoms. 4 These are H and acyl groups with 2 to 12 carbon atoms. 5 (where H is a hydrocarbon group with 1 to 12 carbon atoms, and X is a single bonded hydrocarbon group with 1 to 12 carbon atoms.)

Description

Technical Field

[0001] The present invention relates to a composition, a sheet-like material, a laminate, a method for producing the composition, and a chip-type multilayer electronic component.

Background Art

[0002] Generally, a ceramic green sheet for multilayer ceramic electronic components is produced by forming a slurry in which ceramic particles and a binder resin are mixed into a sheet shape. For example, a vinyl acetate resin is used as the binder resin.

[0003] For the purpose of improving the formability when forming the slurry into a sheet shape or improving the adhesion when laminating the formed sheet-like material, a plasticizer is added to the slurry. By adding the plasticizer, the glass transition temperature (Tg) of the binder resin decreases, and the plasticity of the slurry improves. Phthalates have been used as such plasticizers.

[0004] Patent Document 1 discloses a ceramic green sheet characterized by containing ceramic powder, a binder resin, a plasticizer added in a proportion exceeding the saturation amount with respect to the binder resin, and a solvent, and discloses using a phthalate as the plasticizer.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In recent years, phthalic acid esters have raised concerns about their impact on human health and are regulated by, for example, the revised RoHS (RoHS2) directive etc. That is, since phthalic acid esters are used as plasticizers in the ceramic green sheet described in Patent Document 1, there is a problem of high environmental load.

[0007] The present invention was made to solve the above problems, and an object of the present invention is to provide a composition having plasticity suitable for forming a sheet-like material despite having a low environmental load.

Means for Solving the Problems

[0008] The composition of the present invention contains an inorganic powder, a binder resin, and a plasticizer, and the plasticizer contains a compound having a structure represented by the following general formula (1).

[0009]

Chemical formula

[0010] The sheet-like material of the present invention contains the composition of the present invention.

[0011] The laminate of the present invention is formed by laminating a plurality of the sheet-like materials of the present invention.

[0012] The method for producing the composition of the present invention includes a pulverization step of pulverizing an inorganic material to obtain an inorganic powder, and a mixing step of mixing the inorganic powder, a binder resin, and a plasticizer. The plasticizer includes a compound having a structure represented by the following general formula (1).

[0013]

Chemical formula

[0014] The chip-type multilayer electronic component includes a body in which a plurality of fired sheets are laminated. When the body is viewed from the side, a stripe pattern perpendicular to the lamination direction is formed on the body.

Advantages of the Invention

[0015] According to the present invention, it is possible to provide a composition having plasticity suitable for forming a sheet-like material, despite having a low environmental impact.

Brief Description of the Drawings

[0016] [Figure 1A] Figure 1A is a schematic cross-sectional view showing an example of a sheet-like material according to the present invention. [Figure 1B] Figure 1B is an enlarged view of the dashed line area in Figure 1A. [Figure 2A] Figure 2A is a schematic diagram of an example of a process for producing a laminate using the sheet-like material of the present invention. [Figure 2B] Figure 2B is a schematic diagram of an example of a process for producing a laminate using the sheet-like material of the present invention. [Figure 3] Figure 3 is a schematic side view showing an example of a base body made up of multiple fired sheets stacked together. [Modes for carrying out the invention]

[0017] The following describes the composition, sheet-like material, laminate, method for manufacturing the composition, and chip-type multilayer electronic component of the present invention. However, the present invention is not limited to the following embodiments and can be modified and applied as appropriate without altering the essence of the invention. Combining two or more of the individual preferred configurations of the present invention described in the following embodiments also constitutes the present invention.

[0018] The drawings shown below are schematic representations, and their dimensions, aspect ratios, and scales may differ from those of the actual product.

[0019] Furthermore, the embodiments shown below are illustrative, and it goes without saying that partial substitutions or combinations of the configurations shown in the embodiments are possible at will.

[0020] The composition of the present invention comprises an inorganic powder, a binder resin, and a plasticizer, wherein the plasticizer includes a compound having a structure represented by the following general formula (1).

[0021] [ka] (In general formula (1), R1 A hydrocarbon group has 1 to 12 carbon atoms. In general formula (1), R 2 A hydrocarbon group has 1 to 12 carbon atoms. In general formula (1), R 3 This can be a hydrogen atom, a hydroxyl group, a carboxyl group, an ester group with 2 to 12 carbon atoms, an acyl group with 2 to 12 carbon atoms, an acyloxy group with 2 to 12 carbon atoms, or an alkoxy group with 1 to 12 carbon atoms. In general formula (1), X is a single-bonded hydrocarbon group having 1 to 12 carbon atoms. In general formula (1), R 4 These are hydrogen atoms, acyl groups with 2 to 12 carbon atoms, or hydrocarbon groups with 1 to 12 carbon atoms. In general formula (1), R 5 (A hydrocarbon group is a hydrogen atom with 1 to 12 carbon atoms.)

[0022] Compounds having the structure represented by the above general formula (1) are not phthalate esters. Therefore, the compositions of the present invention have a low environmental impact. Also, R 1 , R 2 , R 3 , R 4 and R 5 If the structure is as described above, then compounds having the structure represented by general formula (1) are easy to handle because they are liquid at room temperature (25°C).

[0023] Furthermore, a plasticizer containing a compound having the structure represented by the general formula (1) above can sufficiently improve the plasticity of a composition containing inorganic powder and a binder resin. Therefore, by using the composition of the present invention, sheet-like materials can be suitably formed.

[0024] The principle by which the plasticity of the composition can be sufficiently improved in this way can be thought to be as follows. Binder resins are generally composed of molecules that have polar groups. The structure represented by the above general formula (1) is "-R 3 " or "-XOR 4The (polar group) portion is easily oriented towards the polar groups of the molecules constituting the binder resin, allowing the plasticizer to easily penetrate between the molecules constituting the binder resin. This blocks the orientation of the polar groups of the molecules constituting the binder resin, widening the spacing between the molecular chains constituting the binder resin and facilitating the movement of the molecular chains. Furthermore, the structure represented by the general formula (1) above has a bulkier molecular structure due to the presence of multiple ester groups. Therefore, the effect of shielding the orientation of polar groups of molecules constituting the binder resin can be further enhanced. This principle allows for a reduction in the Tg of the binder resin, thereby improving the plasticity of the composition.

[0025] The components of the present invention will be described in detail below.

[0026] (Inorganic powder) In the composition of the present invention, the inorganic powder is a ceramic powder composite. In this case, a ceramic green sheet can be produced by forming the composition of the present invention into a sheet-like material.

[0027] In the composition of the present invention, the inorganic powder preferably contains at least one selected from the group consisting of zirconia, thian, alumina, barium titanate, ferrite, lead zirconate titanate, zinc oxide, glass, and glass ceramics. These materials are suitable for manufacturing chip-type multilayer electronic components using the compositions of the present invention.

[0028] In the composition of the present invention, the size of the inorganic powder is not particularly limited, but it is preferable that the average particle diameter is 0.01 μm or more and 50 μm or less.

[0029] In the composition of the present invention, the inorganic powder content is preferably 45% by volume or more and 75% by volume or less, and more preferably 55% by volume or more and 70% by volume or less. As will be described in more detail later, the composition of the present invention is used to produce a sheet-like material. This sheet-like material is laminated and fired to become the base material for a chip-type multilayer electronic component. When the inorganic powder content falls within the above range, the resulting material will have a suitable density and strength for functioning as part of a chip-type multilayer electronic component.

[0030] (Binder resin) In the composition of the present invention, the binder resin preferably contains at least one selected from the group consisting of polyvinyl acetate, polyvinyl butyral, polyvinyl alcohol, acrylic, urethane, polyvinylpyrrolidone, polyethylene glycol, ethylene-vinyl acetate copolymer, and cellulose ether, and more preferably contains polyvinyl acetate. These binder resins are suitable for molding the compositions of the present invention into predetermined shapes because they can bond inorganic powders together.

[0031] In particular, if the binder resin is polyvinyl acetate, the structure represented by the general formula (1) above is "-R 3 " or "-XOR 4 The (polar group) portion is easily oriented towards the acetyloxy group of the molecules constituting polyvinyl acetate, allowing the plasticizer to easily penetrate between the molecules constituting polyvinyl acetate. This can block the orientation of the acetyloxy groups of the molecules constituting polyvinyl acetate, widening the spacing between the molecular chains constituting polyvinyl acetate and facilitating the movement of the molecular chains. Therefore, the Tg of polyvinyl acetate can be lowered, improving the plasticity of the composition.

[0032] In the composition of the present invention, the binder resin is preferably included in an emulsion state. In this case, the inorganic powder in the composition of the present invention does not concentrate in some areas and is easily dispersed.

[0033] (Plasticizer) In the composition of the present invention, the structure R represented by general formula (1) 1R may be a linear or branched hydrocarbon group having 1 to 12 carbon atoms. 1 It may contain unsaturated bonds or be composed solely of saturated bonds, but it is preferable that it be composed solely of saturated bonds. R 1 When R contains unsaturated bonds, it restricts rotation within the molecule, resulting in a rigid, planar structure in the region where the unsaturated bonds are present. On the other hand, R 1 When a molecule consists only of saturated bonds, intramolecular rotation is not restricted, which tends to increase the plasticity of the composition. Note, R 1 It is more preferable that it be an n-butyl group.

[0034] In the composition of the present invention, the structure R represented by general formula (1) 2 R may be a linear, branched, or cyclic hydrocarbon group having 1 to 12 carbon atoms. 2 It may contain unsaturated bonds, or it may consist only of saturated bonds. Note, R 2 It is preferable that it is a linear hydrocarbon group having 3 carbon atoms.

[0035] In the composition of the present invention, the structure R represented by general formula (1) 3 It is preferable that the structure contains an oxygen atom, and more preferably that it is an ester group having 2 to 12 carbon atoms. R 3 It may contain unsaturated bonds, or it may consist only of saturated bonds.

[0036] In the compositions of the present invention, X in the structure represented by general formula (1) is preferably a single bond.

[0037] In the composition of the present invention, the structure R represented by general formula (1) 4 It is preferable that it is an acyl group having 2 to 12 carbon atoms. Also, R 4 It may contain unsaturated bonds, or it may consist only of saturated bonds. Furthermore, the structure represented by general formula (1) is "-OR 4The group is preferably an acetyloxy group.

[0038] In the composition of the present invention, the structure R represented by general formula (1) 5 R may be a linear or branched hydrocarbon group having 1 to 12 carbon atoms. 5 It may contain unsaturated bonds or be composed solely of saturated bonds, but it is preferable that it be composed solely of saturated bonds. Note, R 5 It is preferable that it is an n-butyl group.

[0039] In the compositions of the present invention, the compound having the structure represented by general formula (1) may include a derivative of at least one polyhydric hydroxy acid selected from the group consisting of citric acid, malic acid, isocitric acid, tartaric acid, and tartronic acid. Examples of derivatives of such polyhydric hydroxy acids include alkyl hydroxy acids such as alkyl citrate, alkyl isocitrate, alkyl malate, alkyl tartrate, alkyl tartrate, alkyl acetyl citrate, alkyl acetylisocitrate, alkyl acetylmalate, alkyl acetyltartrate, and alkyl acetyltartrate. In this case, the structure represented by general formula (1) includes a carboxyl group residue (i.e., R 5 (When it is a hydrogen atom) or a hydroxyl group residue (i.e., R 4 (It may be the case that it is a hydrogen atom.)

[0040] In the compositions of the present invention, the compound having the structure represented by general formula (1) is preferably tributyl acetylcitrate (ATBC), as shown in general formula (2) below.

[0041] [ka]

[0042] The alkyl hydroxyates mentioned above are inexpensive, which can reduce the manufacturing cost of the composition of the present invention.

[0043] (solvent) The composition of the present invention may further contain a solvent. Examples of solvents include diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, texanol, eugenol, terpineol, dihydroterpineol, benzyl alcohol, ethanol, isophorone, methyl ethyl ketone, and diethyl ketone. These solvents are useful in uniformly mixing the inorganic powder, binder resin, and plasticizer in the composition of the present invention.

[0044] In the composition of the present invention, the solvent content is preferably 0.05% by weight or more and 20% by weight or less.

[0045] (Other additives) The composition of the present invention may also contain other additives such as dispersants, defoamers, and wetting agents. Examples of dispersants include ammonium polycarboxylates and maleic anhydride-styrene copolymers. Examples of antifoaming agents include polyalkylene glycol, dimethylpolysiloxane, and octadecanol. Examples of humectants include polyalkylene glycol and polyglycerin.

[0046] (Regarding the proportions of each component) In the composition of the present invention, when the inorganic powder content is Vf in volume at room temperature and standard pressure, the binder resin content is Mb by weight and the volume of the binder resin at room temperature and standard pressure is Vb, the plasticizer content is Mp by weight and the volume of the plasticizer at room temperature and standard pressure is Vp, and the content of other organic substances is Vx in volume at room temperature and standard pressure, the following relationship is preferable. Furthermore, "other organic substances" refers to organic substances other than binder resins and plasticizers, and includes the organic substances exemplified above as solvents and other additives.

[0047] In the composition of the present invention, Vf / (Vf+Vb+Vp+Vx)×100 is preferably 45% by volume or more and 75% by volume or less, and more preferably 55% by volume or more and 70% by volume or less. If Vf / (Vf+Vb+Vp+Vx)×100 exceeds 75% by volume, the amount of binder resin is low, making it difficult to adequately bond the inorganic powders together. As a result, when the composition is molded into a predetermined shape, the molded product becomes prone to breakage. If Vf / (Vf+Vb+Vp+Vx)×100 is less than 45% by volume, the dimensional change during firing will be large, and the stress due to shrinkage will increase, making cracks more likely to occur.

[0048] Furthermore, it is preferable that the Mb / Mp ratio is 1.5 or higher and 50 or lower, and more preferably 2.5 or higher and 40 or lower. When the Mb / Mp ratio exceeds 50, the Tg of the binder resin becomes less likely to decrease sufficiently. If the Mb / Mp ratio is less than 1.5, the Tg of the binder resin decreases too much, making it difficult to mold the composition into the desired shape.

[0049] Furthermore, the composition of the present invention preferably has a Vf / (Vf+Vb+Vp+Vx)×100 of 45% by volume or more and 75% by volume or less, and a Mb / Mp of 1.5 or more and 50 or less, and is even more preferably Vf / (Vf+Vb+Vp+Vx)×100 of 55% by volume or more and 70% by volume or less, and a Mb / Mp of 2.5 or more and 40 or less. When the composition of the present invention contains inorganic powder, binder resin, and plasticizer in such proportions, the binder resin and plasticizer are less likely to separate and become uniform. Therefore, when the composition of the present invention is formed into a sheet and the sheet is laminated, the adhesion is improved.

[0050] Next, a method for producing the composition of the present invention will be described. The method for producing the composition of the present invention includes a grinding step of grinding an inorganic material to obtain an inorganic powder, and a mixing step of mixing the inorganic powder, a binder resin, and a plasticizer, wherein the plasticizer includes a compound having a structure represented by the following general formula (1).

[0051] [ka] (In general formula (1), R 1 A hydrocarbon group has 1 to 12 carbon atoms. In general formula (1), R 2 A hydrocarbon group has 1 to 12 carbon atoms. In general formula (1), R 3 This can be a hydrogen atom, a hydroxyl group, a carboxyl group, an ester group with 2 to 12 carbon atoms, an acyl group with 2 to 12 carbon atoms, an acyloxy group with 2 to 12 carbon atoms, or an alkoxy group with 1 to 12 carbon atoms. In general formula (1), X is a single-bonded hydrocarbon group having 1 to 12 carbon atoms. In general formula (1), R 4 These are hydrogen atoms, acyl groups with 2 to 12 carbon atoms, or hydrocarbon groups with 1 to 12 carbon atoms. In general formula (1), R 5 (A hydrocarbon group is a hydrogen atom with 1 to 12 carbon atoms.)

[0052] Compounds having the structure represented by the above general formula (1) are not phthalate esters. Therefore, the method for producing the composition of the present invention has a low environmental impact.

[0053] Furthermore, the plasticity of the composition produced by using a plasticizer containing a compound having the structure represented by the above general formula (1) can be sufficiently improved.

[0054] In the method for producing the composition of the present invention, other organic substances such as solvents and additives may be added in the mixing step, and it is preferable to mix the inorganic powder, the binder resin and the plasticizer so that Vf / (Vf+Vb+Vp+Vx)×100 is 45% by volume or more and 75% by volume or less, and Mb / Mp is 1.5 or more and 50 or less. Furthermore, it is more preferable to mix the inorganic powder, the binder resin and the plasticizer so that Vf / (Vf+Vb+Vp+Vx)×100 is 55% by volume or more and 70% by volume or less, and Mb / Mp is 2.5 or more and 40 or less. When the manufactured composition contains inorganic powder, binder resin, and plasticizer in such proportions, the binder resin and plasticizer are less likely to separate and become more uniform. Therefore, when the manufactured composition is formed into a sheet and the sheet is laminated, the adhesion is improved.

[0055] Next, a chip-type multilayer electronic component manufactured using the composition of the present invention will be described. A chip-type multilayer electronic component manufactured using the composition of the present invention is also one embodiment of the present invention. Furthermore, when manufacturing chip-type multilayer electronic components, sheet-like materials using the composition of the present invention and laminates formed by stacking these sheet-like materials are produced, and these sheet-like materials and laminates are also embodiments of the present invention.

[0056] Figure 1A is a schematic cross-sectional view showing an example of a sheet-like material according to the present invention. Figure 1B is an enlarged view of the dashed line area in Figure 1A. When manufacturing the chip-type multilayer electronic component of the present invention, first, as shown in Figure 1A, the composition of the present invention is formed into a sheet to form a sheet-like material 10a. The method for forming the composition of the present invention into a sheet is not particularly limited, and conventionally known methods such as using a bar coater or printing can be employed.

[0057] Furthermore, when producing the sheet-like material 10a, the specific gravity of the binder resin is lower than that of the inorganic powder, so as shown in Figure 1B, the density of the binder resin 11a increases as it approaches the upper surface of the sheet-like material 10a.

[0058] After forming the sheet-like material 10a, vias (not shown) may be formed on the sheet-like material 10a as needed, and conductive paste (not shown) may be placed on the sheet-like material 10a. The vias and conductive paste can be made from conventionally known materials, and conventionally known methods can also be used for their formation and arrangement.

[0059] Figures 2A and 2B are schematic diagrams of an example of a process for producing a laminate using the sheet-like material of the present invention. Next, as shown in Figure 2A, multiple sheets of material 10a are prepared. Then, as shown in Figure 2B, the sheet-like material 10a is laminated and compressed to produce a mother block 20a, which is a laminated body. The crimping conditions are not particularly limited, and conventionally known methods can be employed.

[0060] Afterward, the mother block 20a may be cut into a predetermined shape to form a chip. Furthermore, if necessary, the edges of the chip-shaped material may be given a rounded chamfer.

[0061] Furthermore, both the mother block 20a and the chip-like material are included in the laminate of the present invention.

[0062] Next, the chip-like material is degreased and fired. As a result, the sheet-like material 10a becomes a fired sheet 10, and a base body 20 consisting of multiple fired sheets 10 stacked together can be produced, as shown in Figure 3. Figure 3 is a schematic side view showing an example of a base body made up of multiple fired sheets stacked together. During this firing process, the conductive paste formed on the sheet-like material 10a becomes the internal electrode.

[0063] Furthermore, during firing, the binder resin 11a contained in the sheet-like material 10a is thermally decomposed and becomes pores 11. As described above, in the sheet-like material 10a, the density of the binder resin 11a increases as you approach the top surface. Therefore, in areas where the density of the binder resin 11a is high, the density of the pores 11 also increases. Consequently, as shown in Figure 3, when the base material 20 is viewed from the side, these pores 11 appear to be formed linearly in a direction perpendicular to the lamination direction. As shown in Figure 3, the base body 20 is made up of multiple fired sheets 10 stacked on top of each other, so when the base body 20 is viewed from the side, a striped pattern perpendicular to the stacking direction is formed on the base body 20.

[0064] The base body 20 may have external electrodes or the like formed on it as needed.

[0065] The chip-type multilayer electronic component of the present invention can be manufactured using this method.

[0066] As described above, when the base body 20 is viewed from the side, it has stripes that are perpendicular to the stacking direction. Therefore, in the chip-type multilayer electronic component of the present invention that includes the base body 20, these stripes can be used as a guide to identify the side of the chip-type multilayer electronic component. In other words, when observing a chip-type multilayer electronic component, the observer can recognize that the surface on which the striped pattern is formed is the side, and the surface on which the striped pattern is not formed is the top or bottom. Therefore, with the chip-type multilayer electronic component of the present invention, there is no need to form other identification markings on the sides, top, or bottom of the base body. Therefore, manufacturing costs can be reduced.

[0067] This specification describes the following inventions.

[0068] The present invention (1) is a composition comprising an inorganic powder, a binder resin, and a plasticizer, wherein the plasticizer comprises a compound having a structure represented by the following general formula (1).

[0069] [ka] (In general formula (1), R 1 A hydrocarbon group has 1 to 12 carbon atoms. In general formula (1), R 2 A hydrocarbon group has 1 to 12 carbon atoms. In general formula (1), R 3 This can be a hydrogen atom, a hydroxyl group, a carboxyl group, an ester group with 2 to 12 carbon atoms, an acyl group with 2 to 12 carbon atoms, an acyloxy group with 2 to 12 carbon atoms, or an alkoxy group with 1 to 12 carbon atoms. In general formula (1), X is a single-bonded hydrocarbon group having 1 to 12 carbon atoms. In general formula (1), R 4 These are hydrogen atoms, acyl groups with 2 to 12 carbon atoms, or hydrocarbon groups with 1 to 12 carbon atoms. In general formula (1), R 5 (A hydrocarbon group is a hydrogen atom with 1 to 12 carbon atoms.)

[0070] The present invention (2) is the composition according to the present invention (1), wherein the plasticizer comprises a derivative of at least one polyhydric hydroxy acid selected from the group consisting of citric acid, malic acid, isocitric acid, tartaric acid, and tartonic acid.

[0071] Invention (3) is the composition according to Invention (1) or (2), wherein the above composition further comprises a solvent.

[0072] The present invention (4) is a composition according to any one of the present inventions (1) to (3), wherein the binder resin comprises at least one selected from the group consisting of polyvinyl acetate, polyvinyl butyral, polyvinyl alcohol, acrylic, urethane, polyvinylpyrrolidone, polyethylene glycol, ethylene-vinyl acetate copolymer, and cellulose ether.

[0073] The present invention (5) is a composition according to any one of the present inventions (1) to (4) in which the inorganic powder is a ceramic powder.

[0074] The present invention (6) is a composition according to any one of the present inventions (1) to (4), wherein the inorganic powder comprises at least one selected from the group consisting of zirconia, thiania, alumina, barium titanate, ferrite, lead zirconate titanate, zinc oxide, glass, and glass ceramics.

[0075] The present invention (7) is a composition according to any one of the present inventions (1) to (6), wherein the above composition contains other organic substances other than the above binder resin and plasticizer, the amount of the above inorganic powder is Vf in volume at room temperature (25 degrees Celsius) and standard atmospheric pressure, the amount of the above binder resin is Mb by weight and the volume of the binder resin at room temperature and standard atmospheric pressure is Vb, the amount of the above plasticizer is Mp by weight and the volume of the plasticizer at room temperature and standard atmospheric pressure is Vp, and the amount of the above other organic substances is Vx in volume at room temperature and standard atmospheric pressure, then Vf / (Vf+Vb+Vp+Vx)×100 is 45% by volume or more and 75% by volume or less, and Mb / Mp is 1.5 or more and 50 or less.

[0076] The present invention (8) is a sheet-like material comprising the composition described in any of the present inventions (1) to (7).

[0077] The present invention (9) is a laminate formed by stacking multiple sheet-like materials described in the present invention (8).

[0078] The present invention (10) is a method for producing a composition comprising a grinding step of grinding an inorganic material to obtain an inorganic powder, and a mixing step of mixing the inorganic powder, a binder resin, and a plasticizer, wherein the plasticizer comprises a compound having a structure represented by the following general formula (1). [ka] (In general formula (1), R 1 A hydrocarbon group has 1 to 12 carbon atoms. In general formula (1), R 2 A hydrocarbon group has 1 to 12 carbon atoms. In general formula (1), R 3This can be a hydrogen atom, a hydroxyl group, a carboxyl group, an ester group with 2 to 12 carbon atoms, an acyl group with 2 to 12 carbon atoms, an acyloxy group with 2 to 12 carbon atoms, or an alkoxy group with 1 to 12 carbon atoms. In general formula (1), X is a single-bonded hydrocarbon group having 1 to 12 carbon atoms. In general formula (1), R 4 These are hydrogen atoms, acyl groups with 2 to 12 carbon atoms, or hydrocarbon groups with 1 to 12 carbon atoms. In general formula (1), R 5 (A hydrocarbon group is a hydrogen atom with 1 to 12 carbon atoms.)

[0079] The present invention (11) is a method for producing the composition described in the present invention (10), wherein in the mixing step described above, the inorganic powder, the binder resin, and the plasticizer are mixed such that, when the content of the inorganic powder is Vf in volume at room temperature (25 degrees Celsius) and standard atmospheric pressure, the content of the binder resin is Mb by weight, and the volume of the binder resin at room temperature and standard atmospheric pressure is Vb, the content of the plasticizer is Mp by weight, and the volume of the plasticizer at room temperature and standard atmospheric pressure is Vp, and the content of the other organic substances is Vx in volume at room temperature and standard atmospheric pressure, Vf / (Vf+Vb+Vp+Vx)×100 is 45% by volume or more and 75% by volume or less, and Mb / Mp is 1.5 or more and 50 or less.

[0080] The present invention (12) is a chip-type multilayer electronic component comprising a base body made of multiple fired sheets laminated together, wherein when the base body is viewed from the side, a striped pattern perpendicular to the lamination direction is formed on the base body. [Examples]

[0081] The following are examples that more specifically disclose the compositions and other components of the present invention. However, the present invention is not limited to the following examples.

[0082] (Examples) A mixture of ferrite, 50 parts by weight of pure water, 0.5 parts by weight of ammonium polycarboxylate (dispersant) per 100 parts by weight of ferrite, and ferrite was prepared by grinding the mixture using a ball mill to produce ferrite powder (inorganic powder).

[0083] Next, ferrite powder, polyvinyl acetate (binder resin), and tributyl acetyl citrate (plasticizer) were blended in predetermined proportions (details will be described later) to prepare a slurry-like composition according to the example.

[0084] Next, the composition according to the example was degassed, and then coated onto a PET film in a sheet-like manner and dried with hot air to produce a sheet-like material (thickness: approximately 50 μm) according to the example.

[0085] (Comparative example) Ferrite powder was prepared in the same manner as in the examples, and the ferrite powder, polyvinyl acetate (binder resin), and dibutyl phthalate (plasticizer) were blended in predetermined proportions (details will be described later) to prepare a slurry-like composition according to the comparative example.

[0086] Next, the composition of the comparative example was degassed, and then coated onto a PET film in a sheet-like manner and dried with hot air to produce a sheet-like material (thickness: approximately 50 μm) of the comparative example.

[0087] (Dynamic viscoelasticity measurement and Tg calculation) Multiple sheet-like materials were prepared according to the examples and comparative examples, with the blending ratios of polyvinyl acetate and plasticizer to ferrite powder as shown in Table 1. Next, the sheet-like materials according to the examples and comparative examples were pressed together to create a laminate with a thickness of 500 μm. Next, the laminates according to the examples and comparative examples were cut to a width × length = 10 mm × 50 mm to be used as test samples. Next, dynamic viscoelasticity measurements were performed using test samples from the examples and comparative examples. Dynamic viscoelasticity measurements were performed using a viscoelasticity measuring device (model name: DMA7000, manufacturer: Hitachi High-Tech Science Co., Ltd.) within a measurement temperature range of -30 to 100°C. Based on the results of dynamic viscoelasticity measurements, the Tg of the binder resin contained in the compositions of the examples and comparative examples was calculated. The results are shown in Table 1.

[0088] [Table 1]

[0089] In Table 1, Vf represents the volume of inorganic powder, Vb represents the volume of binder resin, Vp represents the volume of plasticizer, and Vx represents the volume of other organic substances. In Table 1, Mb represents the weight of the binder resin, and Mp represents the plasticizer content.

[0090] As shown in Table 1, it was found that when tributyl acetylcitrate was used as a plasticizer, the Tg of polyvinyl acetate contained in the composition decreased to the same extent as when dibutyl phthalate was used as a plasticizer.

[0091] (Measurement of adhesion strength) A sheet-like material according to an example was prepared, with Vf / (Vf+Vb+Vp+Vx)×100 at 59% by volume and Mb / Mp at 16.8. The adhesion strength of the sheet-like material in the example was measured by a TAC test. The TAC test was performed using a tacking test machine (model name: TAC1000, manufacturer: Resca Co., Ltd.) at a measurement temperature of 55°C. The adhesion force of the sheet-like material in this embodiment was 169 gf.

[0092] Next, sheet-like materials were prepared according to the examples, with the weight ratios (wt%) of polyvinyl acetate and tributyl acetylcitrate to ferrite powder as shown in Table 2. The adhesion strength of the sheet-like materials according to the examples was then measured and evaluated using the same method as described above. The evaluation criteria are as follows. The results are shown in Table 2. ◎: The adhesion strength of the sheet-like material is 100 gf or more. ○: The adhesion strength of the sheet-like material is 30 gf or more and less than 100 gf. △; The adhesion strength of the sheet-like material is less than 30 gf.

[0093] [Table 2]

[0094] In the above evaluation of adhesion strength, it is believed that the sheet-like material corresponding to the example with an evaluation of "◎" had high adhesion strength because polyvinyl acetate and tributyl acetylcitrate were less likely to separate. In the above evaluation of adhesion strength, in the sheet-like material according to the example that received a "○" rating, it is thought that the adhesion strength was moderate because polyvinyl acetate and tributyl acetylcitrate tend to separate somewhat easily, or the glass transition temperature is somewhat high. In the above evaluation of adhesion strength, it is thought that the sheet-like material corresponding to the example with a "△" evaluation did not achieve sufficient adhesion strength because polyvinyl acetate and tributyl acetylcitrate began to separate, or because the glass transition temperature was high.

[0095] The compositions described in the examples do not contain phthalate esters, and therefore can be said to have a low environmental impact. Furthermore, the above results indicate that the composition according to the example is a composition with plasticity suitable for forming sheet-like materials. Furthermore, it was found that the molded sheet material possessed sufficient adhesive strength.

[0096] (Calculation of firing shrinkage rate) Multiple sheet-like materials were prepared according to the examples in which the blending ratios of polyvinyl acetate and plasticizer to ferrite powder were as shown in Tables 3 and 4. Next, the sheet-like material according to the example was pressed together to create a laminate with a thickness of approximately 1 mm. Next, the laminate according to the example was cut to a width × length = 10 mm × 50 mm to be used as a test sample. Next, the thickness and width of the test samples related to the examples were measured, then degreased and fired, and the shrinkage rate was calculated from the dimensions before and after firing. The results are shown in Tables 3 and 4. The evaluation criteria in Table 4 are as follows: ◎: The shrinkage rate of the laminate due to firing is 19% or less. ○: The shrinkage rate of the laminate due to firing is greater than 19% and 22% or less. △: The shrinkage rate of the laminate due to firing is greater than 22%.

[0097] [Table 3]

[0098] [Table 4]

[0099] In the above evaluation of adhesion strength, it is considered that the shrinkage rate was almost constant in the laminates corresponding to the examples that received an evaluation of "◎" because the filling rate of the inorganic powder was constant. In the above evaluation of adhesion strength, in the laminates corresponding to the examples that received a "○" rating, it is thought that the shrinkage rate increased slightly because the packing density of the inorganic powder began to decrease. In the above evaluation of adhesion strength, it is thought that the laminates corresponding to the examples with a "△" evaluation had a large shrinkage rate because the filling rate of inorganic powder was low.

[0100] In the above evaluation, examples that simultaneously meet the "◎" rating in Table 2 and Table 4 can be evaluated as "Excellent" because they have high adhesion and are less prone to structural defects. Examples that have a "△" rating in at least one of Tables 2 and 4 can be evaluated as "Available," and all other examples can be evaluated as "Good." This evaluation is shown in Table 5.

[0101] [Table 5] [Explanation of symbols]

[0102] 10 Baking Sheets 10a Sheet-like material 11 Stomata 11a Binder resin 20 base body 20a Mother Block

Claims

1. It contains inorganic powder, a binder resin, and a plasticizer. The plasticizer is a composition comprising a compound having a structure represented by the following general formula (1). 【Chemistry 1】 (In general formula (1), R １ These are hydrocarbon groups with 1 to 12 carbon atoms. In general formula (1), R ２ These are hydrocarbon groups with 1 to 12 carbon atoms. In general formula (1), R ３ This can be a hydrogen atom, a hydroxyl group, a carboxyl group, an ester group having 2 to 12 carbon atoms, an acyl group having 2 to 12 carbon atoms, an acyloxy group having 2 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms. In general formula (1), X is a single-bonded hydrocarbon group having 1 to 12 carbon atoms. In general formula (1), R ４ These are a hydrogen atom, an acyl group with 2 to 7 carbon atoms, or a hydrocarbon group with 1 to 12 carbon atoms. In general formula (1), R ５ (A hydrocarbon group is a hydrogen atom with 1 to 12 carbon atoms.)

2. The composition according to claim 1, wherein the plasticizer comprises at least one derivative of a polyhydric hydroxy acid selected from the group consisting of citric acid, malic acid, isocitric acid, tartaric acid, and tartronic acid.

3. The composition according to claim 1, further comprising a solvent.

4. The composition according to claim 1, wherein the binder resin comprises at least one selected from the group consisting of polyvinyl acetate, polyvinyl butyral, polyvinyl alcohol, acrylic, urethane, polyvinylpyrrolidone, polyethylene glycol, ethylene-vinyl acetate copolymer, and cellulose ether.

5. The composition according to claim 1, wherein the inorganic powder comprises ceramic powder.

6. The composition according to claim 1, wherein the inorganic powder comprises at least one selected from the group consisting of zirconia, thian, alumina, barium titanate, ferrite, lead zirconate titanate, zinc oxide, glass, and glass ceramics.

7. The composition comprises the binder resin and other organic substances other than the plasticizer, The amount of the inorganic powder is Vf in volume at room temperature (25°C) and standard atmospheric pressure. The content of the binder resin is Mb by weight, and the volume of the binder resin at room temperature and standard atmospheric pressure is Vb. The content of the plasticizer is Mp by weight, and the volume of the plasticizer at room temperature and standard atmospheric pressure is Vp. When the content of the aforementioned other organic substances is Vx in volume at room temperature and standard atmospheric pressure, The composition according to claim 1, wherein Vf / (Vf+Vb+Vp+Vx)×100 is 45% by volume or more and 75% by volume or less, and Mb / Mp is 1.5 or more and 50 or less.

8. A sheet-like material comprising the composition according to any one of claims 1 to 7.

9. A laminate comprising a plurality of sheet-like materials as described in claim 8.

10. A grinding process that crushes inorganic materials to produce inorganic powder, The process includes a mixing step of mixing the inorganic powder, the binder resin, and the plasticizer. A method for producing a composition containing a compound having a structure represented by the following general formula (1) as the plasticizer. 【Chemistry 2】 (In general formula (1), R １ These are hydrocarbon groups with 1 to 12 carbon atoms. In general formula (1), R ２ These are hydrocarbon groups with 1 to 12 carbon atoms. In general formula (1), R ３ This can be a hydrogen atom, a hydroxyl group, a carboxyl group, an ester group having 2 to 12 carbon atoms, an acyl group having 2 to 12 carbon atoms, an acyloxy group having 2 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms. In general formula (1), X is a single-bonded hydrocarbon group having 1 to 12 carbon atoms. In the general formula (1), R ４ is a hydrogen atom, an acyl group having 2 to 12 carbon atoms, or a hydrocarbon group having 1 to 12 carbon atoms. In general formula (1), R ５ (A hydrocarbon group is a hydrogen atom with 1 to 12 carbon atoms.)

11. In the mixing step, the binder resin and other organic substances other than the plasticizer are mixed, and further, The amount of the inorganic powder is Vf in volume at room temperature (25°C) and standard atmospheric pressure. The content of the binder resin is Mb by weight, and the volume of the binder resin at room temperature and standard atmospheric pressure is Vb. The content of the plasticizer is Mp by weight, and the volume of the plasticizer at room temperature and standard atmospheric pressure is Vp. When the content of the aforementioned other organic substances is Vx in volume at room temperature and standard atmospheric pressure, A method for producing the composition according to claim 10, comprising mixing the inorganic powder, the binder resin, the plasticizer, and the other organic matter such that Vf / (Vf+Vb+Vp+Vx)×100 is 45% by volume or more and 75% by volume or less, and Mb / Mp is 1.5 or more and 50 or less.

12. It has a base body made up of multiple fired sheets stacked together, A chip-type multilayer electronic component in which, when viewed from the side, the base body has a striped pattern formed on it perpendicular to the stacking direction.

Images