Particle dispersion liquid

Abstract

The present invention provides a particle dispersion containing particles and a liquid medium, the distance between the HSP value of the particles and the HSP value of the liquid medium being 15.0 MPa0.5 or less.

Description

Technical Field

[0001] This invention relates to a particle dispersion, etc. Background Technology

[0002] In order to manufacture various industrial components, particle dispersions containing particles dispersed in a liquid medium are used. For example, Patent Document 1 described below describes a particle dispersion using silica particles.

[0003] Previous technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2015-519442 Summary of the Invention

[0006] The technical problem to be solved by the invention

[0007] When mixing particles with a liquid medium to obtain a particle dispersion, it is sometimes necessary to adjust the viscosity of the particle dispersion relative to the viscosity of the liquid medium before mixing with the particles. According to the inventors, while the viscosity of the liquid medium before mixing with the particles may be low, the viscosity of the particle dispersion obtained by mixing the liquid medium with the particles may sometimes be high. In such cases, for example, if the viscosity of the particle dispersion is unexpectedly high when mixing the particles with the liquid medium after selecting a liquid medium for manufacturing industrial components, it can sometimes be difficult to obtain sufficient operability.

[0008] One objective of this invention is to provide a particle dispersion containing particles and a liquid medium, which can reduce the viscosity ratio of the particle dispersion to the liquid medium.

[0009] means for solving technical problems

[0010] In some respects, the present invention relates to the following [1] to

[10] etc.

[0011] [1] A particle dispersion containing particles and a liquid medium.

[0012] The distance between the HSP value of the particle and the HSP value of the liquid medium is 15.0 MPa. 0.5 the following.

[0013] [2] According to the particle dispersion described in [1], wherein,

[0014] The distance between the HSP value of the particles and the HSP value of the liquid medium is 7.5–15.0 MPa. 0.5 .

[0015] [3] The particle dispersion according to [1] or [2], wherein,

[0016] The liquid medium contains methyl isobutyl ketone.

[0017] [4] The particle dispersion according to any one of [1] to [3], wherein,

[0018] The liquid medium contains methyl ethyl ketone.

[0019] [5] The particle dispersion according to any one of [1] to [4], wherein,

[0020] The liquid medium comprises a first dispersion medium and a second dispersion medium, wherein the HSP value of the second dispersion medium is 5.0–15.0 MPa lower than that of the first dispersion medium. 0.5 .

[0021] [6] The particle dispersion according to any one of [1] to [5], wherein,

[0022] The liquid medium contains an organic solvent, and the content of the organic solvent is 80% or more by mass, based on the total mass of the liquid medium.

[0023] [7] The particle dispersion according to any one of [1] to [6], wherein,

[0024] The particles comprise at least one selected from the group consisting of silicon dioxide, cerium dioxide, aluminum oxide, titanium dioxide, boron nitride, and calcium titanate.

[0025] [8] The particle dispersion according to any one of [1] to [7], wherein,

[0026] The particles contain silicon dioxide.

[0027] [9] The particle dispersion according to any one of [1] to [8], wherein,

[0028] The particle has a surface treatment agent on its surface.

[0029]

[10] According to the particle dispersion described in [9], wherein,

[0030] The surface treatment agent comprises a silane compound having an alkoxysilyl group.

[0031] Invention Effects

[0032] According to one aspect of the present invention, a particle dispersion containing particles and a liquid medium can be provided, which can reduce the viscosity ratio of the particle dispersion to the liquid medium. Detailed Implementation

[0033] The embodiments of the present invention will be described below, but the present invention is not limited to these embodiments in any way.

[0034] In this specification, the numerical range indicated by "~" means that the values ​​before and after "~" are included as the minimum and maximum values, respectively. "Above A" in a numerical range refers to the range of A and greater than A. "Below A" in a numerical range refers to the range of A and less than A. In the numerical ranges described in stages in this specification, the upper or lower limit of a numerical range in one stage can be arbitrarily combined with the upper or lower limit of a numerical range in another stage. In the numerical ranges described in this specification, the upper or lower limit can be replaced with the values ​​shown in the examples. "A or B" can include either A or B, or both. Unless otherwise specified, the materials illustrated in this specification can be used alone or in combination of two or more. In the case of multiple substances equivalent to each component in the composition, unless otherwise specified, the content of each component in the composition represents the total amount of the multiple substances present in the composition. The term "process" includes not only independent processes, but also processes that cannot be clearly distinguished from others, as long as the desired effect of the process is achieved. "Solid components" refers to the non-volatile components remaining after removing volatile components (water, organic solvents, etc.).

[0035] The particle dispersion involved in this embodiment contains particles and a liquid medium, and the distance between the HSP value of the particles and the HSP value of the liquid medium (hereinafter referred to as "particle HSP distance relative to the liquid medium") is 15.0 MPa. 0.5 the following.

[0036] According to the particle dispersion of this embodiment, in a particle dispersion containing particles and a liquid medium, the viscosity ratio of the particle dispersion to the liquid medium (hereinafter, as applicable, simply referred to as "viscosity ratio") can be reduced. According to the particle dispersion of this embodiment, in the evaluation shown in the examples described later, the viscosity ratio of the particle dispersion to the liquid medium can, for example, be 9000 or less (preferably 6000 or less, 3000 or less, 1000 or less, 500 or less, etc.). As the viscosity of the liquid medium compared with the viscosity of the particle dispersion, the viscosity (25°C, shear rate 1 min) published in the Compact Edition Solvent Pocket Book, 1st Edition, The Society of Synthetic Organic Chemistry, Japan (1994) can be used. -1 The unpublished viscosity could be measured using an E-type viscometer at 25°C in 1 minute.-1 The shear rate was measured.

[0037] In the particle dispersion described in this embodiment, by adjusting the solid content of the particle dispersion according to the relationship between viscosity and solid content, the viscosity ratio of the particle dispersion relative to the liquid medium can be reduced. Specifically, the solid content of the particle dispersion can be adjusted to achieve the boundary state between non-Bingham fluids and dilatant fluids, and the viscosity of the particle dispersion with such a solid content (viscosity in the non-Bingham fluid state) is used. In non-Bingham fluids, the viscosity does not increase with increasing viscometer rotation speed (shear rate: the same below), while in dilatant fluids, the viscosity increases sharply with increasing viscometer rotation speed. At the boundary state between non-Bingham fluids and dilatant fluids, the behavior of viscosity relative to viscometer rotation speed can be confirmed while changing the solid content of the particle dispersion in increments of 5% by mass, and the solid content of the particle dispersion that exhibits the behavior of non-Bingham fluids (viscosity does not increase with increasing viscometer rotation speed) is used as the solid content of the particle dispersion for comparing viscosity with the liquid medium. By comparing the viscosity with such solid content, the difference in the viscosity ratio of the particle dispersion relative to the liquid medium can be easily identified, and the viscosity ratio can be preferably evaluated. The solid content of the particle dispersion can be adjusted by diluting it with a liquid medium of the same composition as the liquid medium of the particle dispersion, or by evaporating the liquid medium of the particle dispersion.

[0038] When the particle dispersion contains components other than particles and liquid medium (excluding particle surface treatment agents), the particle dispersion according to this embodiment can reduce the viscosity ratio of the particle dispersion to the liquid medium in the state where components other than particles and liquid medium (excluding particle surface treatment agents) have been removed. When the particle dispersion contains components other than particles and liquid medium (excluding particle surface treatment agents), the viscosity of the particle dispersion in the state where these components have been removed can be measured as the viscosity of the particle dispersion.

[0039] The applications of the particle dispersions described in this embodiment are not particularly limited. The particle dispersions described in this embodiment can be used in the manufacture or use of laminates (such as copper-clad laminates), die bonding films, circuit connection components, polishing slurries (such as CMP polishing slurries), sealing materials, electrode active materials for batteries, transfer-type transparent conductive films, etc. For example, the particle dispersions described in this embodiment can be used in the manufacture of semiconductor components, and can be used as slurries for obtaining laminates of semiconductor components, insulating films (such as insulating films of sealing materials), etc.

[0040] The HSP distance of a particle relative to the liquid medium can be determined by δ in the Hansen solubility parameter (HSP). d (Dispersion term), δ p (polar term) and δ h (Hydrogen bond term) and calculated using the following formula. δ d1 δ p1 and δ h1 For the particle's δ d δ p and δ h δ d2 δ p2 and δ h2 For liquid medium δ d δ p and δ h .

[0041] HSP distance = {4 × (δ)} d1 -δ d2 ) 2 +(δ p1 -δ p2 ) 2 +(δ h1 -δ h2 ) 2} 0.5

[0042] Due to the δ of commonly used substances d δ p and δ h Having access to known information sources such as databases, it is possible, for example, to obtain the δ of the desired substance by referring to the database. d δ p and δ h Parameters of substances not registered in the database can be calculated using computer software such as HPiP (Hansen Solubility Parameter in Practice; written by Prof. Steven Abbottand Dr. Yamamoto Hiroshi).

[0043] δ of the particle d1 δ p1 and δ h1 It can be calculated in the following order. First, the particles are recovered by drying the particle dispersion, etc., and the parameter (δ) is prepared. d δ p and δ hSixteen known evaluation solvents were used. Next, a dispersibility test was conducted on the particles of the evaluation target relative to each evaluation solvent to determine whether each solvent was a "solvent with excellent dispersibility" or a "solvent with poor dispersibility." The dispersibility test can be performed using the method shown in the examples described later. Next, the particle dispersion was measured using δ... d δ p and δ h After plotting the evaluation solvents in a three-dimensional coordinate space (Hansen space), a virtual sphere is created in the three-dimensional space that includes all solvents with excellent dispersibility but not all solvents with poor dispersibility. Then, the δ-axis at the center of the sphere can be obtained. d δ p and δ h δ as a particle d1 δ p1 and δ h1 .

[0044] δ d1 δ p1 and δ h1 The value of δ varies depending on the type of particle material, particle size, particle size distribution (coefficient of variation of particle size), and surface treatment details (type of surface treatment agent, amount of surface treatment agent used, surface treatment method, etc.). For example, the larger the particle size, the higher the δ value. d1 It tends to increase, δ p1 and δ h1 The coefficient of variation in particle size tends to decrease. Furthermore, the larger the coefficient of variation in particle size, the lower the δ... p1 It tends to increase, δ h1 The δ value of the particles after surface treatment tends to decrease. d1 δ p1 and δ h1 The entire particle group after surface treatment, taking into account the influence of surface treatment, is considered as the object. As δ d1 δ p1 and δ h1 It can use values ​​at 25℃.

[0045] δ of liquid medium d2 δ p2 and δ h2 It can be calculated based on the composition of the liquid medium in the particle dispersion. When the liquid medium is a mixture of multiple dispersion media, the δ of the liquid medium... d2 δ p2 and δ h2 It can be used as a parameter for each dispersion medium (δ) d δ p or δ h The δ is calculated by multiplying the product of the volume ratio of each dispersion medium relative to the total volume of the mixture. δ represents the volume ratio of each component constituting the liquid medium. d δp and δ h The numerical values ​​can be obtained from the database of the analysis software HSPiP (Hansen Solubility Parameter in Practice; written by Prof. Steven Abbott and Dr. Yamamoto Hiroshi). Parameters (δ) of components not registered in the database. d δ p and δ h The value can be calculated using structural analysis software called SMILES. As δ... d2 δ p2 and δ h2 It can use values ​​at 25℃.

[0046] The inventors have discovered that adjusting the HSP distance between particles and the liquid medium is effective in adjusting the viscosity ratio of the particle dispersion to the liquid medium, and that reducing the HSP distance between particles and the liquid medium is effective in reducing the viscosity ratio of the particle dispersion to the liquid medium. In the particle dispersion of this embodiment, the HSP distance between the particles and the liquid medium is 15.0 MPa. 0.5 Therefore, the viscosity ratio of the particle dispersion to the liquid medium can be reduced. The main reason for this tendency is speculated to be as follows: if the HSP distance is within the aforementioned range, the increased dispersibility of the particles relative to the liquid medium leads to a larger distance between the particles, thereby weakening the interaction between them and thus reducing the viscosity ratio of the particle dispersion to the liquid medium. However, the main reason for this tendency is not limited to this.

[0047] HSP distance of particles relative to the liquid medium (unit: MPa) 0.5It can be within the following range. From the perspective of easily reducing the viscosity ratio, the HSP distance of the particles relative to the liquid medium can be below 14.8, 14.6, 14.5, 14.4, 14.2, 14.0, 13.8, 13.6, 13.5, 13.4, 13.2, 13.0, 12.5, 12.0, 11.8, 11.6, 11.5, 11.4, 11.2, 11.0, 10.8, 10.6, 10.5, 10.4, 10.2, 10.0, 9.8, 9.5, 9.0, 8.5, 8.2, 8.0, 7.5, 7.0, 6.5, 6.0, 5.5, 5.0, 4.8, or 4.6. From the perspective of adjusting the viscosity ratio, the HSP distance of the particles relative to the liquid medium can be greater than 0.0, greater than 0.5, greater than 1.0, greater than 1.5, greater than 2.0, greater than 2.5, greater than 3.0, greater than 3.5, greater than 4.0, greater than 4.5, greater than 4.6, greater than 4.8, greater than 5.0, greater than 5.5, greater than 5.5, greater than 6.0, greater than 6.5, greater than 7.0, greater than 7.1, greater than 7.5, greater than 8.0, greater than 8.2, greater than 8.5, greater than 9.0, greater than 9.5, and greater than 9. 0.8 or above, 10.0 or above, 10.2 or above, 10.4 or above, 10.5 or above, 10.6 or above, 10.8 or above, 11.0 or above, 11.2 or above, 11.4 or above, 11.5 or above, 11.6 or above, 11.8 or above, 12.0 or above, 12.5 or above, 13.0 or above, 13.2 or above, 13.4 or above, 13.5 or above, 13.6 or above, 13.8 or above, 14.0 or above, 14.2 or above, 14.4 or above, 14.5 or above, or 14.6 or above. From these perspectives, the HSP distance of the particle relative to the liquid medium can be greater than 0.0 and less than 15.0, greater than 0.0 and less than 12.0, greater than 0.0 and less than 10.0, 7.5 to 15.0, 7.5 to 12.0, 7.5 to 10.0, 9.0 to 15.0, 9.0 to 12.0, or 9.0 to 10.0.

[0048] In the particle dispersion of this embodiment, at least a portion of the particles can be dispersed in a liquid medium. The particles constitute the solid component of the particle dispersion. The particles may include inorganic particles or organic particles.

[0049] Examples of inorganic particle constituent materials include oxides such as silicon dioxide, cerium dioxide, aluminum oxide, titanium dioxide, zirconium oxide, magnesium oxide, yttrium oxide, zinc oxide, and iron oxide; nitrides such as silicon nitride, titanium nitride, and boron nitride; hydroxides such as cerium hydroxide; metals such as copper, nickel, gold, silver, tin, zinc, platinum, bismuth, indium, and antimony; silicon carbide; calcium carbonate; aluminum sulfate; barium sulfate; potassium titanate; barium titanate; and calcium titanate. Inorganic particles can be produced using methods such as melt processing, sol-gel processing, and liquid-phase processing. Examples of organic particle constituent materials include resins such as acrylic resin, styrene resin, urea-formaldehyde resin, phenolic resin, epoxy resin, and benzoguanamine resin. One or more constituent materials can be used alone or in combination to form the particles. From the viewpoint of easily reducing the viscosity ratio and easily obtaining excellent particle dispersibility, the particles may include inorganic particles, non-metallic materials, or at least one selected from the group consisting of silicon dioxide, cerium dioxide, aluminum oxide, titanium dioxide, boron nitride and calcium titanate, or at least one selected from the group consisting of silicon dioxide and aluminum oxide, or silicon dioxide.

[0050] The particles may or may not undergo surface treatment. Surface-treated particles may have a surface-treating agent on their surface. The surface treatment method can be dry or wet.

[0051] Examples of surface treatment agents include silane compounds (e.g., silane coupling agents), titanium compounds (e.g., titanium coupling agents), and aluminate compounds (e.g., aluminate coupling agents). Surface treatment agents may contain alkoxy, alkoxysilyl, phenyl, vinyl, epoxy, acryloyl, methacryl, amino, urea, mercapto, isocyanate, etc. From the viewpoint of easily obtaining excellent particle dispersibility, surface treatment agents may contain silane compounds, or silane compounds containing alkoxysilyl groups.

[0052] From the viewpoint of easily obtaining excellent particle dispersibility, silane compounds, as silane compounds having alkoxysilyl groups, can contain silane compounds having alkoxy groups bonded to silicon atoms. In such silane compounds, from the viewpoint of easily obtaining excellent particle dispersibility, the number of alkoxy groups bonded to silicon atoms can be 1 to 4, 1 to 3, 2 to 3, or 3 to 4.

[0053] From the viewpoint of easily obtaining excellent particle dispersibility, silane compounds can include silane compounds having nitrogen-containing organic groups. Examples of nitrogen-containing organic groups include alkylamino, alkylaminoalkyl, arylamino, arylaminoalkyl, heteroarylamino, and heteroarylaminoalkyl groups. From the viewpoint of easily obtaining excellent particle dispersibility, the nitrogen-containing organic group can include arylaminoalkyl, phenylaminoalkyl, or phenylaminopropyl groups.

[0054] Examples of silane compounds include N-phenyl-3-aminopropyltrimethoxysilane, phenyltrimethoxysilane, vinyltrimethoxysilane, epoxytrimethoxysilane, trimethoxymethacrylate, aminotrimethoxysilane, ureotrimethoxysilane, mercaptopropyltrimethoxysilane, isocyanate-propyltrimethoxysilane, phenylaminotrimethoxysilane, acrylatetrimethoxysilane, p-styrenetrimethoxysilane, 3-acryloyloxypropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-isocyanate-propyltrimethoxysilane, and 3-aminopropyltrimethoxysilane. From the viewpoint of easily obtaining excellent particle dispersibility, silane compounds may include N-phenyl-3-aminopropyltrimethoxysilane.

[0055] From the viewpoint of easily obtaining excellent particle dispersibility, the content of the surface treatment agent relative to 100 parts by mass of particles (excluding the content of the surface treatment agent) can be within the following ranges: The content of the surface treatment agent can be 0.01 parts by mass or more, 0.05 parts by mass or more, 0.1 parts by mass or more, 0.3 parts by mass or more, or 0.5 parts by mass or more. The content of the surface treatment agent can be 10 parts by mass or less, 8.0 parts by mass or less, 5.0 parts by mass or less, 3.0 parts by mass or less, 2.0 parts by mass or less, 1.5 parts by mass or less, 1.0 parts by mass or less, 0.8 parts by mass or less, or 0.5 parts by mass or less. From these viewpoints, the content of the surface treatment agent can be 0.01 to 10 parts by mass, 0.05 to 5.0 parts by mass, or 0.1 to 2.0 parts by mass.

[0056] From the perspective of adjusting the viscosity ratio or particle dispersibility, the specific gravity of the particles (unit: g / cm³) 3 The specific gravity of the particles can be within the following ranges: The specific gravity of the particles can be 0.1 or higher, 0.5 or higher, 1.0 or higher, 1.5 or higher, or 2.0 or higher. The specific gravity of the particles can be 8.0 or lower, 7.0 or lower, 6.0 or lower, 5.0 or lower, 4.0 or lower, 3.0 or lower, or 2.5 or lower. From these perspectives, the specific gravity of the particles can be 0.1 to 8.0, 1.0 to 8.0, or 1.0 to 5.0.

[0057] From the perspective of adjusting the viscosity ratio or the dispersion of particles, the δ of the particles d1(Unit: MPa) 0.5 The value of the particle (δ) can be within the following range. d1 It can be 8.0 or higher, 9.0 or higher, 10.0 or higher, 10.5 or higher, 11.0 or higher, 11.5 or higher, 12.0 or higher, 12.5 or higher, or 13.0 or higher. The particle's δ... d1 It can be below 25.0, below 22.0, below 20.0, below 19.5, below 19.0, below 18.5, below 18.0, below 17.5, below 17.0, below 16.5, below 16.0, below 15.5, below 15.0, below 14.5, below 14.0, or below 13.5. Considering these points, the particle's δ... d1 It can be 8.0~25.0, 8.0~20.0, 8.0~15.0, 10.0~25.0, 10.0~20.0, 10.0~15.0, 12.0~25.0, 12.0~20.0, or 12.0~15.0.

[0058] From the perspective of adjusting the viscosity ratio or the dispersion of particles, the δ of the particles p1 (Unit: MPa) 0.5 The value of the particle (δ) can be within the following range. p1 It can be 1.0 or higher, 2.0 or higher, 3.0 or higher, 4.0 or higher, 5.0 or higher, 6.0 or higher, 7.0 or higher, 7.5 or higher, 8.0 or higher, 8.5 or higher, 9.0 or higher, 9.5 or higher, 10.0 or higher, 10.5 or higher, 11.0 or higher, or 11.5 or higher. The particle's δ... p1 It can be below 20.0, below 18.0, below 16.0, below 15.0, below 14.5, below 14.0, below 13.5, below 13.0, below 12.5, or below 12.0. Considering these points, the particle's δ... p1 It can be 1.0~20.0, 1.0~15.0, 1.0~12.0, 8.0~20.0, 8.0~15.0, 8.0~12.0, 10.0~20.0, 10.0~15.0, or 10.0~12.0.

[0059] From the perspective of adjusting the viscosity ratio or the dispersion of particles, the δ of the particles h1 (Unit: MPa) 0.5 The value of the particle (δ) can be within the following range. h1It can be 1.0 or higher, 2.0 or higher, 3.0 or higher, 4.0 or higher, 5.0 or higher, 6.0 or higher, 7.0 or higher, 8.0 or higher, 8.5 or higher, 9.0 or higher, 9.5 or higher, 10.0 or higher, 10.5 or higher, 11.0 or higher, 11.5 or higher, 12.0 or higher, 12.5 or higher, or 13.0 or higher. The particle's δ... h1 It can be below 20.0, 19.0, 18.0, 17.0, 16.0, 15.5, 14.5, or 13.5. Considering these points, the particle's δ... h1 It can be 1.0~20.0, 1.0~18.0, 1.0~15.0, 8.0~20.0, 8.0~18.0, 8.0~15.0, 10.0~20.0, 10.0~18.0, or 10.0~15.0.

[0060] From the perspective of easily reducing the viscosity ratio and easily obtaining excellent particle dispersibility, the content of inorganic particles (excluding the content of surface-treated agents when the inorganic particles have undergone surface treatment) can be based on the total mass of particles (the total number of particles contained in the particle dispersion; excluding the content of surface-treated agents when the particles have undergone surface treatment), and can be 50% or more by mass, greater than 50% by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 92% or more by mass, 95% or more by mass, 97% or more by mass, 98% or more by mass, 99% or more by mass, or substantially 100% by mass.

[0061] As the content of particles (including the content of surface-treated agents when particles are surface-treated), the content of inorganic particles (excluding the content of surface-treated agents when particles are surface-treated), the content of inorganic particles (including the content of surface-treated agents when particles are surface-treated), or the content of inorganic particles (excluding the content of surface-treated agents when particles are surface-treated), from the viewpoint of adjusting the viscosity ratio or the dispersibility of particles, the content A1, based on the total mass of the particle dispersion, can be within the following ranges. Content A1 can be 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 5% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, 40% by mass or more, 45% by mass or more, 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, or 70% by mass or more. The content A1 can be less than 99% by mass, less than 95% by mass, less than 90% by mass, less than 85% by mass, less than 80% by mass, less than 75% by mass, or less than 70% by mass. From these perspectives, the content A1 can be 0.1–99% by mass, 0.1–90% by mass, 0.1–80% by mass, 5–99% by mass, 5–90% by mass, 5–80% by mass, 30–99% by mass, 30–90% by mass, or 30–80% by mass.

[0062] Examples of liquid media (dispersion media constituting a liquid medium) include organic solvents, water, and resin materials (e.g., resin materials that are liquid at 25°C). Organic solvents are a general term for organic compounds that have the property of dissolving other substances and are widely used in coating, cleaning, printing, etc. Organic solvents are liquid at 25°C. In the particle dispersion liquid involved in this embodiment, only one of the organic solvent, water, and resin material may be used, or at least two of the organic solvent, water, and resin material may be used in combination. One organic solvent and one resin material may be used alone, or two or more may be used in combination.

[0063] Examples of organic solvents include ketone compounds (excluding alcohols) such as methyl isobutyl ketone (MIBK), methyl ethyl ketone (MEK), diisobutyl ketone, acetone, cyclohexanone, acetophenone, and benzophenone; aromatic hydrocarbons such as benzene, toluene, xylene, styrene, and diethylbenzene; aliphatic hydrocarbons such as pentane, hexane, heptane, octane, nonane, and decane; alicyclic hydrocarbons such as cyclohexane, methylcyclohexane, and decahydronaphthalene; chlorinated hydrocarbons such as chlorobenzene, dichlorobenzene, trichlorobenzene, methylene chloride, chloroform, carbon tetrachloride, and tetrachloroethylene; and methanol, ethanol, 1-propanol (n-propanol), 2-propanol (isopropanol), propylene glycol 1-monomethyl ether, 1-butanol, 2-butanol, tert-butanol, 1-pentanol, 2-pentanol, 3-pentanol, and diacetone. Alcohols such as 1-hexanol, 2-ethyl-1-hexanol, cyclohexanol, and benzyl alcohol; phenolic compounds such as cresol; etheric compounds such as dibenzyl ether, diethyl ether, ethylene glycol monomethyl ether, diethylene glycol monobutyl ether, methyl phenyl ether (anisole), phenyl ether group, dioxane, and tetrahydrofuran (excluding compounds belonging to alcohols); esteric compounds such as ethyl acetate, butyl acetate, benzyl acetate, ethyl benzoate, benzyl benzoate, and γ-butyrolactone; nitrile compounds such as acetonitrile; sulfoxide compounds such as dimethyl sulfoxide, diethyl sulfoxide, dipropyl sulfoxide, and diphenyl sulfoxide; amide compounds such as formamide, N,N-dimethylacetamide, 1-methyl-2-pyrrolidone, and N-methyl-2-pyrrolidone; carbonate compounds such as ethylene carbonate and propylene carbonate; and acid anhydrides such as acetic anhydride. From the viewpoint of easily reducing the viscosity ratio and easily obtaining excellent particle dispersibility, the liquid medium may contain an organic solvent, or at least one selected from the group consisting of methyl isobutyl ketone, methyl ethyl ketone and toluene, or methyl isobutyl ketone, or methyl ethyl ketone.

[0064] The liquid medium may contain hydrophobic organic solvents, or multiple hydrophobic organic solvents. As a hydrophobic organic solvent, a solvent with a solubility in water of less than 1 g / 100 mL at 25°C can be used.

[0065] When the liquid medium contains an organic solvent, from the viewpoint of easily reducing the viscosity ratio and easily obtaining excellent particle dispersibility, the content of organic solvent, based on the total mass of the liquid medium (the total amount of liquid medium contained in the particle dispersion), can be 20% or more by mass, 30% or more by mass, 50% or more by mass, greater than 50% by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 92% or more by mass, 95% or more by mass, 97% or more by mass, 98% or more by mass, 99% or more by mass, or substantially 100% by mass.

[0066] From the perspective of adjusting the viscosity ratio, the δ of the liquid medium in the particle dispersion... d2 δp2 or δ h2 (Unit: MPa) 0.5 The value can be within the following range. The δ value, as the liquid medium in the particle dispersion, is... d2 δ p2 or δ h2 When the liquid medium consists of a single dispersion medium, the δ of this dispersion medium... d2 δ p2 or δ h2 As an object, in the case where the liquid medium contains multiple dispersion media, the δ of the mixture of all the dispersion media contained in the particle dispersion is considered. d2 δ p2 or δ h2 As an object.

[0067] δ of the particle d2 It can be 10.0 or higher, 11.0 or higher, 12.0 or higher, 13.0 or higher, 14.0 or higher, 14.5 or higher, 15.0 or higher, 15.5 or higher, 16.0 or higher, 16.5 or higher, 17.0 or higher, 17.5 or higher, 18.0 or higher, or 18.5 or higher. The δ value of the liquid medium... d2 It can be below 25.0, below 22.0, below 20.0, below 19.5, below 19.0, below 18.5, below 18.0, below 17.5, below 17.0, below 16.5, below 16.0, below 15.5, or below 15.0. Considering these points, the δ of the liquid medium... d2 It can be 10.0~25.0, 10.0~20.0, 10.0~17.0, 12.0~25.0, 12.0~20.0, 12.0~17.0, 15.0~25.0, 15.0~20.0, or 15.0~17.0.

[0068] δ of liquid medium p2 It can be 1.0 or higher, 2.0 or higher, 3.0 or higher, 4.0 or higher, 5.0 or higher, 5.5 or higher, 6.0 or higher, 6.5 or higher, 7.0 or higher, 7.5 or higher, 8.0 or higher, 8.5 or higher, 9.0 or higher, 10.0 or higher, 11.0 or higher, 12.0 or higher, 13.0 or higher, 14.0 or higher, 15.0 or higher, 16.0 or higher, below 17.0, or 18.0 or higher. δ for liquid media. p2It can be below 20.0, 19.0, 18.0, 17.0, 16.0, 15.0, 14.0, 13.0, 12.0, 11.0, 10.0, 9.0, 8.5, 7.5, 6.5, 5.0, 4.5, 3.5, 2.0, or 1.5. From these perspectives, the δ of the liquid medium... p2 It can be 1.0~20.0, 1.0~15.0, 1.0~10.0, 3.0~20.0, 3.0~15.0, 3.0~10.0, 6.0~20.0, 6.0~15.0, or 6.0~10.0.

[0069] δ of liquid medium h2 It can be 1.0 or higher, 2.0 or higher, 3.0 or higher, 4.0 or higher, 5.0 or higher, 5.5 or higher, 6.0 or higher, 6.5 or higher, 7.0 or higher, 7.5 or higher, 8.0 or higher, 8.5 or higher, 9.0 or higher, 10.0 or higher, 11.0 or higher, 12.0 or higher, 13.0 or higher, 14.0 or higher, 15.0 or higher, 16.0 or higher, 17.0 or higher, 18.0 or higher, 19.0 or higher, 20.0 or higher, 21.0 or higher, or 22.0 or higher. The δ value of the liquid medium... h2 It can be below 23.0, below 22.0, below 21.0, below 20.0, below 19.0, below 18.0, below 17.0, below 16.0, below 15.0, below 14.0, below 13.0, below 12.0, below 11.0, below 10.0, below 9.0, below 8.5, below 8.0, below 7.5, below 7.0, below 6.5, below 6.0, below 5.5, below 5.0, below 4.5, below 4.0, below 3.5, below 3.0, below 2.5, or below 2.0. From these perspectives, the δ of the liquid medium... h2 It can be 1.0~23.0, 1.0~15.0, 1.0~6.0, 3.0~23.0, 3.0~15.0, 3.0~6.0, 4.0~23.0, 4.0~15.0, or 4.0~6.0.

[0070] The inventors have discovered that when a liquid medium comprises a first dispersion medium and a second dispersion medium as multiple dispersion media, adjusting the distance between the HSP value of the second dispersion medium and the HSP value of the first dispersion medium (the HSP distance between the dispersion media: hereinafter referred to as "the HSP distance of the second dispersion medium relative to the first dispersion medium") is effective in adjusting the viscosity ratio of the particle dispersion relative to the liquid medium. When the HSP distance of the second dispersion medium relative to the first dispersion medium is small, there is a tendency to easily reduce the viscosity ratio. The HSP distance of the second dispersion medium relative to the first dispersion medium can be calculated using the following formula: δ d21 δ p21 and δ h21 δ for the first dispersion medium d δ p and δ h δ d22 δ p22 and δ h22 δ for the second dispersion medium d δ p and δ h .

[0071] HSP distance = {4 × (δ)} d21 -δ d22 ) 2 +(δ p21 -δ p22 ) 2 +(δ h21 -δ h22 ) 2} 0.5

[0072] HSP distance of the second dispersion medium relative to the first dispersion medium (unit: MPa) 0.5The following ranges may be considered. From the viewpoint of easily reducing the viscosity ratio, the HSP distance of the second dispersion medium relative to the first dispersion medium may be 18.0 or less, 17.5 or less, 17.0 or less, 16.5 or less, 16.0 or less, 15.5 or less, 15.0 or less, 14.5 or less, 14.0 or less, 13.5 or less, 13.0 or less, 12.5 or less, 12.0 or less, 11.5 or less, 11.0 or less, 10.5 or less, 10.0 or less, 9.5 or less, 9.0 or less, 8.5 or less, 8.0 or less, 7.5 or less, 7.0 or less, 6.5 or less, 6.0 or less, or 5.5 or less. From the perspective of adjusting the viscosity ratio, the HSP distance of the second dispersion medium relative to the first dispersion medium can be greater than 0.0, greater than 1.0, greater than 2.0, greater than 3.0, greater than 4.0, greater than 5.0, greater than 5.5, greater than 6.0, greater than 6.5, greater than 7.0, greater than 7.5, greater than 8.0, greater than 8.5, greater than 9.0, greater than 9.5, greater than 10.0, greater than 10.5, greater than 11.0, greater than 11.5, greater than 12.0, greater than 12.5, greater than 13.0, greater than 13.5, greater than 14.0, greater than 14.5, greater than 15.0, greater than 15.5, greater than 16.0, greater than 16.5, less than 17.0, or greater than 17.5. From these perspectives, the HSP distance of the second dispersion medium relative to the first dispersion medium can be greater than 0.0 and less than 18.0, greater than 0.0 and less than 15.0, greater than 0.0 and less than 10.0, 5.0 to 18.0, 5.0 to 15.0, 5.0 to 10.0, 7.0 to 18.0, 7.0 to 15.0, or 7.0 to 10.0. The particle dispersion can contain three or more dispersion media; for example, in addition to the first and second dispersion media having HSP distances within the aforementioned ranges, other dispersion media may also be included.

[0073] From the viewpoint of adjusting the viscosity ratio, the content of the liquid medium relative to 100 parts by mass of particles (including the content of the surface treatment agent when the particles are surface-treated) or 100 parts by mass of particles (excluding the content of the surface treatment agent when the particles are surface-treated) can be within the following ranges: The content of the liquid medium can be 10 parts by mass or more, 15 parts by mass or more, 20 parts by mass or more, 25 parts by mass or more, 30 parts by mass or more, 35 parts by mass or more, 40 parts by mass or more, 45 parts by mass or more, 50 parts by mass or more, 60 parts by mass or more, 80 parts by mass or more, or 100 parts by mass or more. The content of the liquid medium can be less than 200 parts by mass, less than 150 parts by mass, less than 120 parts by mass, less than 100 parts by mass, less than 100 parts by mass, less than 80 parts by mass, less than 60 parts by mass, less than 50 parts by mass, or less than 45 parts by mass. From these viewpoints, the content of the liquid medium can be 10 to 200 parts by mass, 20 to 120 parts by mass, or 30 to 60 parts by mass.

[0074] From the perspective of adjusting the viscosity ratio, the content of the liquid medium, based on the total mass of the particle dispersion, can be within the following ranges: The content of the liquid medium can be 1% by mass or more, 5% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, 40% by mass or more, or 45% by mass or more. The content of the liquid medium can be 99.9% by mass or less, 99.5% by mass or less, 99% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, 60% by mass or less, 55% by mass or less, 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, or 30% by mass or less. From these perspectives, the content of the liquid medium can be 1–99.9% by mass, 5–80% by mass or 10–70% by mass.

[0075] From the perspective of adjusting the viscosity ratio, based on the total mass of the particle dispersion, the total mass of particles and liquid media (including the content of surface treatment agent when particles are surface treated), the total mass of particles and liquid media (excluding the content of surface treatment agent when particles are surface treated), the total mass of inorganic particles and liquid media (including the content of surface treatment agent when inorganic particles are surface treated), or the total mass of inorganic particles and liquid media (excluding the content of surface treatment agent when inorganic particles are surface treated) can be 50% or more by mass, greater than 50% by mass, 70% or more by mass, 80% or more by mass, 90% or more by mass, 92% or more by mass, 95% or more by mass, 97% or more by mass, 98% or more by mass, 99% or more by mass, or substantially 100% by mass.

[0076] The particle dispersion described in this embodiment may contain components other than particles and a liquid medium (excluding surface treatment agents for the particles). For example, components soluble in a liquid medium can be used. Examples of components other than particles and a liquid medium include resin materials that are not liquid at 25°C.

[0077] 25℃, shear rate 1min -1 The viscosity V1 (unit: mPa·s) of the particle dispersion can be within the following ranges: Viscosity V1 can be 100 or higher, 200 or higher, 300 or higher, 400 or higher, 500 or higher, 600 or higher, 700 or higher, 800 or higher, 900 or higher, 1000 or higher, 2000 or higher, 3000 or higher, 4000 or higher, 5000 or higher, 8000 or higher, or 10000 or higher. Viscosity V1 can be below 15000, below 12000, below 10000, below 8000, below 5000, below 4000, below 3000, below 2000, below 1000, below 900, below 800, below 700, below 600, below 500, below 400, or below 300. From these perspectives, the viscosity V1 can be 100–15000, 150–5000, or 200–800.

[0078] The method for manufacturing a particle dispersion according to this embodiment includes a mixing step of mixing particles and a liquid medium together. The method for manufacturing a particle dispersion according to this embodiment can be implemented as follows: a selection step, in which particles and a liquid medium are selected based on the HSP distance between the particles and the liquid medium; and a mixing step, in which the particles and the liquid medium (the particles and liquid medium selected in the selection step) are mixed together. In this implementation, by selecting the particles and the liquid medium based on the HSP distance between the particles and the liquid medium, the viscosity ratio of the particle dispersion to the liquid medium can be adjusted. For example, by selecting an HSP distance of 15.0 MPa between the particles and the liquid medium... 0.5 The following particles and liquid media can reduce the viscosity ratio of the particle dispersion to the liquid medium. In the selected process, particles can be selected based on material type, particle size, particle size distribution (coefficient of variation of particle size), surface treatment content (type of surface treatment agent, amount of surface treatment agent used, surface treatment method, etc.), and liquid media can be selected based on the type of material of the dispersion medium constituting the liquid medium and the content of the dispersion medium.

[0079] The viscosity adjustment method according to this embodiment includes an adjustment step that adjusts the relative relationship between the viscosity of a particle dispersion containing particles and a liquid medium and the viscosity of the liquid medium based on the HSP distance between the particles and the liquid medium. In this adjustment step, the viscosity ratio of the particle dispersion to the liquid medium can be adjusted. In this adjustment step, the HSP distance between the particles and the liquid medium is adjusted to 15.0 MPa. 0.5 The following methods can reduce the viscosity ratio of the particle dispersion to the liquid medium.

[0080] Example

[0081] The present invention will be further described in detail below with reference to specific embodiments. However, the present invention is not limited to these embodiments.

[0082] <Preparation of Materials>

[0083] (particle)

[0084] Silica particles: Manufactured by ADMATECHS COMPANY LIMITED, product name "SO-32R", produced by melt processing, with particle sizes of 1.5μm (D50) and 4.5μm (D95), and a specific gravity of 2.2 g / cm³. 3

[0085] Alumina particles: Manufactured by SUMITOMO CHEMICAL COMPANY, LIMITED, product name "AA04 alumina", particle size 0.4μm (D50) and 0.6μm (D95), specific gravity 3.9 g / cm³. 3

[0086] (Surface treatment agent)

[0087] Silane coupling agent: N-phenyl-3-aminopropyltrimethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd., product name "KBM-573".

[0088] (Liquid medium)

[0089] The various dispersion media listed in Tables 1-3

[0090] <Preparation of Particle Dispersions>

[0091] (Examples A1 to A16 and Comparative Examples A1 to A6)

[0092] By combining 100 parts by weight of silica particles, 0.5 parts by weight of silane coupling agent, and 3.5 × 10⁻⁶... -2A mixture of 42.8 parts by weight of pure water and 42.8 parts by weight of the liquid medium (single dispersion medium) from Table 1 was prepared in a beaker to obtain a mixture. The beaker containing the mixture was then placed in a 60°C water bath and stirred at a speed of 150 min using a two-blade stirrer (made by Teflon) powered by a Sany motor. -1 A 1-hour wet treatment was performed to obtain a mixture with a solid content of 70% by mass.

[0093] Then, using a Nanozer apparatus (manufactured by Yoshida Machinery Co. Ltd., product name "NM2-2000AR") and a FILMIX apparatus (manufactured by PRIMIX Corporation, product name "FM40-40L"), a pitting-based dispersion treatment was performed (Nanomizer treatment conditions: 3 passes through the nozzle; FILMIX treatment conditions: 40 m / s, 1 minute), thereby preparing a particle dispersion with a solid content of 70% by mass.

[0094] The solid content of the particle dispersion was pre-selected as follows: while changing the solid content of the particle dispersion in increments of 5% by mass, the viscosity behavior relative to the rotational speed of an E-type viscometer (manufactured by Toki Sangyo Co., Ltd., product names "TV-22" and "TV-33") was confirmed, and the boundary state between non-Bingham fluid and dilatant fluid was achieved. The solid content of the particle dispersion was also pre-selected.

[0095] (Examples B1 to B21 and Comparative Example B1)

[0096] As 42.8 parts by mass of liquid medium, the liquid medium (a mixture of multiple dispersion media) in Table 2 was used. Otherwise, a particle dispersion with a solid content of 70% by mass was prepared in the same manner as in Example A1.

[0097] (Examples C1 to C11 and Comparative Example C1)

[0098] By combining 100 parts by weight of alumina particles, 0.5 parts by weight of silane coupling agent, and 3.5 × 10⁻⁶... -2 A mixture of 1 part by weight of pure water and 100 parts by weight of the liquid medium (single dispersion medium) listed in Table 3 was prepared in a beaker to obtain a mixture. The beaker containing the mixture was then placed in a 60°C water bath and stirred at a speed of 150 min using a two-blade stirrer (made by Teflon) powered by a Sany motor. -1 A 1-hour wet treatment was performed to obtain a mixture with a solid content of 50% by mass.

[0099] Then, using a Nanozer apparatus (manufactured by Yoshida Machinery Co. Ltd., product name "NM2-2000AR") and a FILMIX apparatus (manufactured by PRIMIX Corporation, product name "FM40-40L"), a pitting-based dispersion treatment was performed (Nanomizer treatment conditions: 3 passes through the nozzle; FILMIX treatment conditions: 40 m / s, 1 minute), thereby preparing a particle dispersion (silica slurry) with a solid content of 50% by mass.

[0100] <HSP value of particles>

[0101] The powdered particles were recovered by drying the particle dispersion at 130°C for 1 hour. Based on real-image observation using a scanning electron microscope (SEM), the particle size D50 (hereinafter referred to as "particle size A") and particle size D100 were obtained.

[0102] Next, 0.02 g of the particles were placed in each of 16 containers (screw flasks), and 20 mL of each of 16 organic solvents were added to each container to prepare the test solution (particle content: approximately 0.1% by mass). The 16 organic solvents used were methyl isobutyl ketone, toluene, methanol, cyclohexanol, acetone, acetonitrile, formamide, benzyl benzoate, dimethyl sulfoxide, ethyl acetate, ethanol, acetic anhydride, γ-butyrolactone, methyl ethyl ketone, 1-butanol, and cyclohexane. The test solution was dispersed for 5 minutes using an ultrasonic dispersion device (manufactured by AS ONE Co., Ltd., product name "VS-D100"). The particle size distribution (cumulative particle size distribution, volume distribution) of the particles in the test solution was then measured using a particle size analyzer (manufactured by Shimadzu Corporation, product name "SALD-7500"). For the cases using the aforementioned 16 organic solvents, the particle size D50 (hereinafter referred to as "particle size B") was obtained based on the particle size distribution measurement results. In addition, the particle size distribution of the standard particles (MBP1-10) was determined in advance, and the measurement was confirmed to be appropriate.

[0103] Based on the particle size distribution measurements, the coefficient of variation (CV) of the particle size was obtained for each of the 16 organic solvents used. A CV greater than 20 was classified as polydisperse, and a CV less than 20 was classified as monodisperse. For each of the 16 organic solvents, the criteria for classifying them as either "poorly dispersible solvent" or "excellently dispersible solvent" were determined.

[0104] For the benchmark of aggregation in a monodisperse state, a particle size twice the aforementioned particle size A (assuming the particle size when two particles are in contact) is used as a threshold. Organic solvents with a particle size B above this threshold are judged as "solvents with poor dispersibility", and organic solvents with a particle size B below this threshold are judged as "solvents with excellent dispersibility".

[0105] On the other hand, for the benchmark of aggregation in a polydisperse state, since the particle size distribution is wide, from the viewpoint of wanting to set a benchmark that is easy to use as the object of aggregation, the above-mentioned particle size D100 is used as the threshold. Organic solvents with particle size B above the threshold are judged as "solvents with poor dispersibility", and organic solvents with particle size B below the threshold are judged as "solvents with excellent dispersibility".

[0106] Next, using the analysis software HSPiP (Hansen Solubility Parameter in Practice; written by Prof. Steven Abbott and Dr. Yamamoto Hiroshi), the δ... d δ p and δ h The 16 organic solvents mentioned above are plotted in a three-dimensional space (Hansen space) using coordinate axes. The δ values ​​for each organic solvent are... d δ p and δ h The values ​​in the database used the aforementioned analysis software.

[0107] Next, a virtual sphere was constructed in the aforementioned three-dimensional space, containing all of the aforementioned "solvents with excellent dispersibility" but not all of the aforementioned "poorly dispersible solvents". Then, the δ value at the center of this sphere was obtained. d δ p and δ h δ as a particle d1 δ p1 and δ h1 In silica particles, it is represented by "δ". d1 =13.4MPa 0.5 δ p1 =11.7MPa 0.5 δ h1 =13.1MPa 0.5 In alumina particles, it is represented by "δ". d1 =17.1MPa 0.5 δ p1 =10.3MPa 0.5 δ h1 =12.7MPa 0.5 ".

[0108] <HSP value of liquid medium>

[0109] δ as a liquid medium d δ p and δ h The values ​​were obtained from the database of the analysis software HSPiP (Hansen Solubility Parameter in Practice; written by Prof. Steven Abbott and Dr. Yamamoto Hiroshi). The δ values ​​for the liquid medium, as a mixture of multiple dispersion media, were analyzed. d2（mix） δ p2（mix） and δ h2（mix） The parameters (δ) of each dispersion medium were used. d δ p or δ h The sum of the products of the volume ratios of the liquid media and the volume proportions of each dispersion medium. The δ of the liquid media in the examples and comparative examples... d2 δ p2 and δ h2 The results are shown in Tables 1-3. Since the amount of pure water used in the mixture with the silane coupling agent is small, the effect of this pure water is not considered.

[0110] <Calculation of HSP distance>

[0111] Based on particle δ d1 δ p1 and δ h1 and the δ of liquid media d2 δ p2 and δ h2 The HSP distance of the particle relative to the liquid medium was calculated using the following formula. The HSP distances (particle / liquid medium) are shown in Tables 1-3.

[0112] HSP distance = {4 × (δ)} d1 -δ d2 ) 2 +(δ p1 -δ p2 ) 2 +(δ h1 -δ h2 ) 2} 0.5

[0113] In the case where a liquid medium is used as a mixture of multiple dispersion media, the δ of the first dispersion medium is considered. d21 δ p21 and δ h21 and the δ of the second dispersion medium d22 δ p22 and δ h22The HSP distance between the dispersion media was calculated using the following formula. The HSP distance (dispersion medium 1 / dispersion medium 2) is shown in Table 2.

[0114] HSP distance = {4 × (δ)} d21 -δ d22 ) 2 +(δ p21 -δ p22 ) 2 +(δ h21 -δ h22 ) 2} 0.5

[0115] <Viscosity Measurement>

[0116] Using an E-type viscometer (manufactured by Toki Sangyo Co., Ltd., product names "TV-22" and "TV-33"), the viscosity was measured at 25°C with a shear rate of 1 min. -1 The viscosity A of the aforementioned particle dispersion was measured. Since the upper limit of viscosity that can be measured using a TV-22 viscometer is 14650 mPa·s, viscosities A below 14650 mPa·s were measured using a TV-22 viscometer, while viscosities A above 14650 mPa·s were measured using a TV-33 viscometer (upper limit of measurable viscosity: 1000 Pa·s). In the design of the TV-33 viscometer, when measuring the viscosity of the same liquid using both the TV-22 and TV-33 viscometers, there is a tendency to obtain a measurement value that is twice that obtained using the TV-22 viscometer. Therefore, from the viewpoint of using the measurement value of the TV-22 viscometer as a reference, viscosity A was obtained by correcting the measurement value obtained using the TV-33 viscometer to half its original value.

[0117] The viscosity B of the liquid medium used in each particle dispersion (at 25°C and a shear rate of 1 min) -1 Furthermore, in the case where the liquid medium contains multiple dispersion media, the viscosity of the mixture of all dispersion media contained in the particle dispersion is obtained using the viscosity (25°C, shear rate 1 min) published in The Society of Synthetic Organic Chemistry, Japan, 1994, in the Compact Edition of the Solvent Pocket Book, 1st Edition. -1 The viscosity of the mixture of dispersion media is calculated by summing the products of the viscosity of each dispersion medium and the volume ratio of each dispersion medium. The viscosity ratio (A / B) of viscosity A to viscosity B is shown in Tables 1-3.

[0118]

[0119]

[0120]

Claims

1. A particle dispersion comprising particles and a liquid medium, The distance between the HSP value of the particle and the HSP value of the liquid medium is 15.0 MPa. 0.5 the following.

2. The particle dispersion according to claim 1, wherein, The distance between the HSP value of the particles and the HSP value of the liquid medium is 7.5–15.0 MPa. 0.5 .

3. The particle dispersion according to claim 1, wherein, The liquid medium contains methyl isobutyl ketone.

4. The particle dispersion according to claim 1, wherein, The liquid medium contains methyl ethyl ketone.

5. The particle dispersion according to any one of claims 1 to 4, wherein, The liquid medium comprises a first dispersion medium and a second dispersion medium. The HSP value of the second dispersion medium is 5.0–15.0 MPa lower than that of the first dispersion medium. 0.5 .

6. The particle dispersion according to any one of claims 1 to 4, wherein, The liquid medium contains an organic solvent. Based on the total mass of the liquid medium, the content of the organic solvent is 80% by mass or more.

7. The particle dispersion according to any one of claims 1 to 4, wherein, The particles comprise at least one selected from the group consisting of silicon dioxide, cerium dioxide, aluminum oxide, titanium dioxide, boron nitride, and calcium titanate.

8. The particle dispersion according to any one of claims 1 to 4, wherein, The particles contain silicon dioxide.

9. The particle dispersion according to any one of claims 1 to 4, wherein, The particle has a surface treatment agent on its surface.

10. The particle dispersion according to claim 9, wherein, The surface treatment agent comprises a silane compound having an alkoxysilyl group.

Images