Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
  • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
  • C08F20/10—Esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
  • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
  • C08K3/013—Fillers, pigments or reinforcing additives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/20—Applications use in electrical or conductive gadgets

Definitions

• the present invention relates to (meth)acrylic resin particles, a vehicle composition, a slurry composition, and a method for producing electronic components.
• a multilayer ceramic capacitor is known to have a structure that includes a laminate in which dielectric layers and internal electrodes are alternately stacked, and a pair of external electrodes that sandwich the laminate.
• the external electrodes are formed by applying a conductive paste for the external electrodes to the surface of the laminate and sintering it.
• Patent Document 1 describes a methacrylate ester copolymer obtained by copolymerizing isobutyl methacrylate, 2-ethylhexyl methacrylate, and a methacrylate ester having a hydroxyl group in a predetermined ratio, and claims that the use of such a binder resin can provide good moldability and degreasing properties.
• Patent Document 2 describes the use of acrylic resin, polyvinyl butyral resin, polyvinyl acetal resin, ethyl cellulose resin, etc. as a binder resin, and in particular describes the use of polyvinyl butyral resin or polyvinyl acetal resin to make the sheet thinner.
• the present invention aims to provide (meth)acrylic resin particles that exhibit excellent low-temperature decomposition properties, can produce molded products with high strength, and can be further multi-layered and thinned to produce ceramic laminates with excellent properties. It also aims to provide a vehicle composition, a slurry composition, and a method for producing electronic components that contain the (meth)acrylic resin particles.
• the present disclosure (1) is directed to (meth)acrylic resin particles having a weight average molecular weight of 1.1 million or more and 5 million or less, and a weight concentration of S atoms of 0.0020 wt % or more and 1.0000 wt % or less.
• the present disclosure (2) is the (meth)acrylic resin particles of the present disclosure (1), in which the weight concentration of K atoms is 0.002% by weight or more and 1.000% by weight or less.
• the present disclosure (3) is the (meth)acrylic resin particles of the present disclosure (1) or (2), in which the weight concentration of OH groups is 0.00% by weight or more and 1.50% by weight or less.
• the present disclosure (4) is (meth)acrylic resin particles having an average particle size of 0.1 ⁇ m or more and 1.0 ⁇ m or less, in any combination with any of the present disclosures (1) to (3).
• the present disclosure (5) is a (meth)acrylic resin particle in any combination with any of the present disclosures (1) to (4), in which the average carbon number Cp of the ester substituents calculated by the following formula is 3 to 6.
• the present disclosure (6) is a vehicle composition containing the (meth)acrylic resin particles of any one of the present disclosures (1) to (5) and a solvent containing an organic solvent.
• the present disclosure (8) is the vehicle composition of the present disclosure (6) or (7), in which the ratio (Cs/Cp) of the average number of carbon atoms Cs of the ester substituents of the organic solvent to the average number of carbon atoms Cp of the ester substituents of the (meth)acrylic resin is 0.3 to 3.0.
• the present disclosure (9) is a vehicle composition which is an arbitrary combination with any of the present disclosures (6) to (8), in which the solvent further contains water in an amount of 100 ppm by weight or more and 11,500 ppm by weight or less.
• the present disclosure (10) is a slurry composition containing the vehicle composition of any one of the present disclosures (6) to (9), inorganic particles, and a dispersant.
• the present disclosure (11) is a method for producing an electronic component using the slurry composition of the present disclosure (10). The present invention will be described in detail below.
• (meth)acrylic resin particles having a specified weight-average molecular weight and weight concentration of S atoms exhibit excellent low-temperature decomposition properties, and that when used as a binder for dispersing inorganic particles, molded products with high strength can be obtained, enabling further multi-layering and thinning. They have also found that the use of such (meth)acrylic resin particles makes it possible to manufacture ceramic laminates with excellent properties, and have completed the present invention.
• the (meth)acrylic resin particles have a weight average molecular weight (Mw) of 1.1 million or more and 5 million or less.
• Mw weight average molecular weight
• the weight average molecular weight (Mw) is preferably 1.3 million or more, more preferably 1.5 million or more, and even more preferably 2 million or more.
• the weight average molecular weight (Mw) is preferably 4.5 million or less, more preferably 4 million or less, and even more preferably 3.5 million or less.
• the weight average molecular weight (Mw) is preferably from 1.3 million to 4.5 million, more preferably from 1.5 million to 4 million, and even more preferably from 2 million to 3.5 million.
• the number average molecular weight (Mn) of the (meth)acrylic resin particles is preferably 300,000 or more, more preferably 600,000 or more, and is preferably 2,000,000 or less, more preferably 1,500,000 or less.
• the number average molecular weight (Mn) is preferably 300,000 to 2,000,000, more preferably 600,000 to 1,500,000.
• the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the (meth)acrylic resin particles is 1 or more, and preferably 5.0 or less, more preferably 4.0 or less, and even more preferably 3.5 or less.
• the Mw/Mn is preferably 1 to 5.0, more preferably 1 to 4.0, and even more preferably 1 to 3.5. When it is in the above range, fine undissolved matter is unlikely to be generated in the vehicle composition, the strength of the resin sheet can be sufficiently increased, and the generation of voids in the ceramic laminate after firing can be prevented.
• the weight average molecular weight (Mw) and the number average molecular weight (Mn) are average molecular weights calculated based on polystyrene standards, and can be obtained by GPC measurement using, for example, a column LF-804 (manufactured by Showa Denko KK).
• the weight concentration of S atoms contained in the (meth)acrylic resin particles is 0.0020% by weight or more and 1.0000% by weight or less. By setting the content within the above range, it is possible to achieve both low-temperature decomposition property and strength of the molded product.
• the weight concentration of the S atoms is preferably 0.0030% by weight or more, more preferably 0.0060% by weight or more, even more preferably 0.0100% by weight or more, and preferably 0.9000% by weight or less, more preferably 0.1000% by weight or less, and even more preferably 0.0400% by weight or less.
• the weight concentration of the S atoms is preferably 0.0030 to 0.9000% by weight, more preferably 0.0060 to 0.1000% by weight, and even more preferably 0.0100 to 0.0400% by weight. If it is below the upper limit, the low-temperature decomposition can be improved, and if it is above the lower limit, the tensile performance can be in a good range and the strength of the molded product can be increased.
• the weight concentration of S atoms means the ratio of the weight of S atoms in the (meth)acrylic resin structure to the weight of the (meth)acrylic resin particles, and can be calculated based on the following formula.
• Weight concentration of S atoms contained in (meth)acrylic resin particles [(weight of S atoms contained in all monomers+weight of S atoms contained in all chain transfer agents+weight of S atoms contained in all polymerization initiators)/(weight of all monomers+weight of all chain transfer agents+weight of all polymerization initiators)] ⁇ 100
• the weight concentration of S atoms can also be determined by ICP-AES (inductively coupled plasma atomic emission spectrometry).
• the weight concentration of K atoms contained in the (meth)acrylic resin particles is preferably 0.002% by weight or more and 1.000% by weight or less from the viewpoint of strength of a molded product.
• the weight concentration of the K atoms is preferably 0.010% by weight or more, more preferably 0.015% by weight or more, more preferably 0.500% by weight or less, and even more preferably 0.030% by weight or less.
• the weight concentration of the K atoms is preferably 0.002 to 1.000% by weight, more preferably 0.010 to 0.500% by weight, and even more preferably 0.015 to 0.030% by weight.
• the weight concentration of K atoms means the ratio of the weight of K atoms in the (meth)acrylic resin structure to the weight of the (meth)acrylic resin particles, and can be calculated based on the following formula.
• Weight concentration of K atoms contained in (meth)acrylic resin particles [(weight of K atoms contained in all monomers+weight of K atoms contained in all chain transfer agents+weight of K atoms contained in all polymerization initiators)/(weight of all monomers+weight of all chain transfer agents+weight of all polymerization initiators)] ⁇ 100
• the weight concentration of K atoms can also be measured using an atomic absorption photometer.
• the weight concentration of the OH group contained in the (meth)acrylic resin particles is preferably 0.00% by weight or more, preferably 1.50% by weight or less, more preferably 0.50% by weight or less, and even more preferably 0.25% by weight or less.
• the weight concentration of the OH group is preferably 0.00 to 1.50% by weight, more preferably 0.00 to 0.50% by weight, and even more preferably 0.00 to 0.25% by weight.
• the weight concentration of the OH group means the ratio of the weight of the OH group in the (meth)acrylic resin structure to the weight of the (meth)acrylic resin particle, and can be calculated based on the following formula.
• Weight concentration of OH groups contained in (meth)acrylic resin particles [(weight of OH groups contained in all monomers+weight of OH groups contained in all chain transfer agents+weight of OH groups contained in all polymerization initiators)/(weight of all monomers+weight of all chain transfer agents+weight of all polymerization initiators)] ⁇ 100
• the weight concentration of the OH group can also be determined by ESCA analysis using a gas phase chemical modification method.
• the weight concentration of COOH groups contained in the (meth)acrylic resin particles is not particularly limited, but from the viewpoint of low-temperature decomposition, it is preferable that the particles contain no COOH groups and that the weight concentration of COOH groups is 0% by weight.
• the (meth)acrylic resin particles preferably have an average particle size of 0.1 ⁇ m or more and 1.0 ⁇ m or less. By setting the content within the above range, the solubility of the (meth)acrylic resin particles can be further improved.
• the average particle size is preferably 0.2 ⁇ m or more, more preferably 0.3 ⁇ m or more, more preferably 0.9 ⁇ m or less, and even more preferably 0.8 ⁇ m or less.
• the average particle size is preferably 0.1 to 1.0 ⁇ m, more preferably 0.2 to 0.9 ⁇ m, and even more preferably 0.3 to 0.8 ⁇ m.
• the average particle size can be determined, for example, by measuring the volume average particle size using a laser diffraction/scattering type particle size distribution measuring device.
• the average particle size can be adjusted by the type and amount of the polymerization initiator. For example, the average particle size tends to be small when the content of the polymerization initiator is large, and tends to be large when the content of the polymerization initiator is small. In addition, the average particle size tends to be small when a persulfate such as ammonium persulfate or potassium persulfate is used.
• a persulfate such as ammonium persulfate or potassium persulfate
• the CV value of the particle size of the (meth)acrylic resin particles is preferably 15% or less, more preferably 12% or less, even more preferably 10% or less, and even more preferably 8% or less.
• the solubility of the (meth)acrylic resin particles can be further improved.
• the improved solubility leads to increased productivity, and the reduced amount of undissolved resin leads to improved tensile properties.
• the lower limit is not particularly limited, and is, for example, 0%.
• the CV value of the particle size is preferably 0 to 15%, more preferably 0 to 12%, even more preferably 0 to 10%, and even more preferably 0 to 8%.
• the CV value can be calculated from the average particle size and standard deviation of 100 particles by observing the (meth)acrylic resin particles using a scanning electron microscope.
• the CV value tends to be smaller when a persulfate such as ammonium persulfate or potassium persulfate is used.
• the (meth)acrylic resin particles preferably contain a segment derived from a (meth)acrylic acid ester having an ester substituent with 8 or less carbon atoms.
• the ester substituent having 8 or less carbon atoms means that the total number of carbon atoms other than the carbon constituting the (meth)acryloyl group in the (meth)acrylic acid ester is 8 or less.
• Examples of the (meth)acrylic acid ester having an ester substituent with 8 or less carbon atoms include (meth)acrylic acid esters having a linear, branched or cyclic alkyl group.
• Examples of the (meth)acrylic acid ester having a linear alkyl group include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, and n-butyl (meth)acrylate.
• Examples of the (meth)acrylic acid ester having a branched alkyl group include isopropyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate.
• Examples of the (meth)acrylic acid ester having a cyclic alkyl group include cyclohexyl (meth)acrylate and benzyl (meth)acrylate.
• examples of the (meth)acrylic acid ester having an ester substituent with 8 or less carbon atoms include (meth)acrylates having a hydroxyl group or a carboxyl group, such as 2-hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, and (meth)acrylic acid, and (meth)acrylic acid esters having a glycidyl group.
• Examples of the (meth)acrylic acid ester having a glycidyl group include glycidyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate glycidyl ether, and 3,4-epoxycyclohexyl (meth)acrylate.
• (meth)acrylic acid esters having a linear alkyl group and (meth)acrylic acid esters having a branched alkyl group are preferred.
• methyl methacrylate, ethyl methacrylate, and isobutyl methacrylate are more preferred.
• a combination of a (meth)acrylic acid ester having a linear alkyl group and a (meth)acrylic acid ester having a branched alkyl group is preferred.
• the (meth)acrylic acid ester having an ester substituent with 8 or less carbon atoms a (meth)acrylic acid ester having an ester substituent with 1 to 4 carbon atoms may be used, or a (meth)acrylic acid ester having an ester substituent with 5 to 8 carbon atoms may be used. Among these, a (meth)acrylic acid ester having an ester substituent with 1 to 4 carbon atoms is preferred. In addition, the (meth)acrylic acid ester having an ester substituent with 8 or less carbon atoms preferably does not include a (meth)acrylic acid ester having a glycidyl group.
• the content of the segment derived from the (meth)acrylic acid ester having 8 or less carbon atoms in the ester substituent in the (meth)acrylic resin particles is preferably 40% by weight or more, more preferably 60% by weight or more, and even more preferably 80% by weight or more. There is no particular upper limit, but it is preferably 100% by weight or less, more preferably 99% by weight or less, and even more preferably 98% by weight or less.
• the content of the segment derived from the (meth)acrylic acid ester having 8 or less carbon atoms in the ester substituent is preferably 40 to 100% by weight, more preferably 60 to 99% by weight, and even more preferably 80 to 98% by weight.
• the content of the above-mentioned segments in the above-mentioned (meth)acrylic resin particles can be calculated based on the ratio of each monomer to 100 parts by weight of raw material monomers excluding a polymerization initiator and a chain transfer agent among the raw materials when producing the (meth)acrylic resin constituting the (meth)acrylic resin particles.
• the content of the segment derived from the (meth)acrylic acid ester having a branched alkyl group with 8 or less carbon atoms in the ester substituent in the (meth)acrylic resin particles is preferably 30% by weight or more, more preferably 35% by weight or more, and preferably 70% by weight or less, more preferably 60% by weight or less.
• the content of the segment derived from the (meth)acrylic acid ester having a branched alkyl group with 8 or less carbon atoms in the ester substituent is preferably 30 to 70% by weight, more preferably 35 to 60% by weight.
• the content of the segment derived from the (meth)acrylic acid ester in which the ester substituent has 1 to 4 carbon atoms in the (meth)acrylic resin particles is preferably 40% by weight or more, more preferably 60% by weight or more, and even more preferably 80% by weight or more. There is no particular upper limit, but it is, for example, 100% by weight or less.
• the content of the segment derived from the (meth)acrylic acid ester in which the ester substituent has 1 to 4 carbon atoms is preferably 40 to 100% by weight, more preferably 60 to 100% by weight, and even more preferably 80 to 100% by weight.
• the content of the segment derived from the (meth)acrylic acid ester in which the ester substituent has 5 to 8 carbon atoms in the (meth)acrylic resin particles is preferably 60% by weight or less, more preferably 40% by weight or less, and even more preferably 20% by weight or less.
• the lower limit is not particularly limited, but is, for example, 0% by weight or more.
• the content of the segment derived from the (meth)acrylic acid ester in which the ester substituent has 5 to 8 carbon atoms is preferably 0 to 60% by weight, more preferably 0 to 40% by weight, and even more preferably 0 to 20% by weight.
• the content of the methyl methacrylate-derived segments in the (meth)acrylic resin particles is preferably 5% by weight or more, more preferably 10% by weight or more, and is preferably 40% by weight or less, more preferably 30% by weight or less.
• the content of the methyl methacrylate-derived segments is preferably 5 to 40% by weight, more preferably 10 to 30% by weight.
• the content of the ethyl methacrylate-derived segments in the (meth)acrylic resin particles is preferably 10% by weight or more, more preferably 20% by weight or more, and preferably 30% by weight or less, more preferably 25% by weight or less.
• the content of the ethyl methacrylate-derived segments is preferably 10 to 30% by weight, more preferably 20 to 25% by weight.
• the content of the n-butyl methacrylate-derived segment in the (meth)acrylic resin particles is preferably 25% by weight or more, more preferably 30% by weight or more, and preferably 50% by weight or less, more preferably 40% by weight or less.
• the content of the n-butyl methacrylate-derived segment is preferably 25 to 50% by weight, more preferably 30 to 40% by weight.
• the content of the isobutyl methacrylate-derived segments in the (meth)acrylic resin particles is preferably 30% by weight or more, more preferably 35% by weight or more, and preferably 60% by weight or less, more preferably 50% by weight or less.
• the content of the isobutyl methacrylate-derived segments is preferably 30 to 60% by weight, more preferably 35 to 50% by weight.
• the (meth)acrylic resin particles may have a segment derived from a (meth)acrylic acid ester having an ester substituent with 9 or more carbon atoms.
• the number of carbon atoms in the ester substituent is preferably 10 or more, and is preferably 30 or less, and more preferably 20 or less.
• the number of carbon atoms in the ester substituent is preferably 9 to 30, and more preferably 10 to 20.
• Examples of the (meth)acrylic acid esters having an ester substituent with 9 or more carbon atoms include (meth)acrylic acid esters having a linear or branched alkyl group with 9 or more carbon atoms, polyalkylene glycol (meth)acrylates, etc.
• Examples of the (meth)acrylic acid ester having a linear or branched alkyl group having 9 or more carbon atoms include n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, n-lauryl (meth)acrylate, isolauryl (meth)acrylate, n-stearyl (meth)acrylate, and isostearyl (meth)acrylate.
• the polyalkylene glycol (meth)acrylate may, for example, have an ethylene glycol unit, a propylene glycol unit, or a butylene glycol unit.
• the polyalkylene glycol (meth)acrylate may have an alkoxy group at its terminal, or may have an ethylhexyl group at its terminal.
• the polyalkylene glycol (meth)acrylate may have a linear alkylene glycol unit or a branched alkylene glycol unit.
• the content of the segment derived from the (meth)acrylic acid ester in the ester substituent having 9 or more carbon atoms in the (meth)acrylic resin particles is preferably 60% by weight or less, more preferably 40% by weight or less, and even more preferably 20% by weight or less.
• the lower limit is not particularly limited, but is, for example, 0% by weight or more.
• the content of the segment derived from the (meth)acrylic acid ester in the ester substituent having 9 or more carbon atoms is preferably 0 to 60% by weight, more preferably 0 to 40% by weight, and even more preferably 0 to 20% by weight.
• the content of the acrylic monomer-derived segment in the (meth)acrylic resin particles is preferably 5% by weight or less, more preferably 1% by weight or less, since the lower content has the advantage of improving low-temperature decomposition.
• the lower limit is not particularly limited, but is, for example, 0% by weight or more.
• the content of the acrylic monomer-derived segment is preferably 0 to 5% by weight, more preferably 0 to 1% by weight, and even more preferably 0% by weight.
• the acrylic monomer means acrylic acid and acrylic esters.
• the (meth)acrylic resin particles preferably have an average carbon number Cp of ester substituents calculated by the following formula of 3 or more and preferably 6 or less.
• the average carbon number Cp is 3 or more, the resulting resin sheet has a good breaking elongation and improved tensile performance.
• the average carbon number Cp is 6 or less, the yield stress is high and improved tensile performance.
• the average carbon number Cp is preferably 3.3 or more and more preferably 4.5 or less.
• the average carbon number Cp is preferably 3 to 6 and more preferably 3.3 to 4.5.
• the (meth)acrylic resin particles preferably have a glass transition temperature (Tg) of 30° C. or higher and 85° C. or lower.
• Tg glass transition temperature
• the Tg is more preferably 32° C. or higher, even more preferably 42° C. or higher, and more preferably 80° C. or lower, even more preferably 75° C. or lower.
• the Tg is preferably 30 to 85° C., more preferably 32 to 80° C., even more preferably 42 to 75° C.
• the glass transition temperature (Tg) can be measured, for example, by using a differential scanning calorimeter (DSC).
• the (meth)acrylic resin particles preferably have a 90% decomposition temperature of 280°C or less when heated from 30°C at 5°C/min, more preferably 270°C or less, and even more preferably 260°C or less. There is no particular lower limit, and the lower the temperature, the better, as long as it is 30°C or more.
• the 90% decomposition temperature is preferably 30 to 280°C, more preferably 30 to 270°C, and even more preferably 30 to 260°C.
• Examples of a method for producing the (meth)acrylic resin particles include a method in which an organic solvent or the like is added to a raw material monomer mixture containing a (meth)acrylic acid ester or the like to prepare a monomer mixture, and a polymerization initiator and a chain transfer agent are further added to the obtained monomer mixture to copolymerize the raw material monomers.
• the polymerization method is not particularly limited, and examples thereof include emulsion polymerization, suspension polymerization, bulk polymerization, interfacial polymerization, solution polymerization, etc. Among these, emulsion polymerization is preferred.
• organic solvents examples include toluene, ethyl acetate, butyl acetate, pentyl acetate, hexyl acetate, ethyl butyrate, butyl butyrate, pentyl butyrate, hexyl butyrate, isopropanol, methyl isobutyl ketone, methyl ethyl ketone, methyl isobutyl ketone, ethylene glycol ethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoisobutyl ether, trimethylpentanediol monoisobutyrate, butyl carbitol, butyl carbitol acetate, terpineol, terpineol acetate, dihydroterpineol, dihydro
• butyl acetate, terpineol, terpineol acetate, dihydroterpineol, dihydroterpineol acetate, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoisobutyl ether, butyl carbitol, butyl carbitol acetate, and texanol are preferred.
• butyl acetate, terpineol, terpineol acetate, dihydroterpineol, and dihydroterpineol acetate are more preferred.
• These organic solvents may be used alone or in combination of two or more.
• polymerization initiator examples include t-butyl peroxypivalate, p-menthane hydroperoxide, diisopropylbenzene hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, cumene hydroxyperoxide, t-butyl hydroxyperoxide, cyclohexanone peroxide, disuccinic acid peroxide, etc.
• imidazole-based azo compounds such as 2,2'-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride, 2,2'-azobis[2-(2-imidazolin-2-yl)propane]sulfatohydrate, and 2,2'-azobis[2-(2-imidazolin-2-yl)propane], 2,2'-azobis(2-methylpropionamidine)dihydrochloride, 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropane], etc.
• water-soluble azo compounds such as 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamidine] tetrahydrate, 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide], and 4,4'-azobis-4-cyanovaleric acid; oxoacids such as potassium persulfate (potassium peroxodisulfate), ammonium persulfate (ammonium peroxodisulfate), and sodium persulfate (sodium peroxodisulfate); and peroxides such as hydrogen peroxide, peracetic acid, performic acid, and perpropionic acid.
• oxoacids such as potassium persulfate (potassium peroxodisulfate), ammonium persulfate (ammonium peroxodisulfate), and sodium persulfate (sodium peroxodisulfate)
• peroxides such as
• a polymerization initiator containing an S atom or a polymerization initiator containing a K atom is preferably used.
• potassium persulfate, ammonium persulfate, 2,2'-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride, and 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide] are preferred, and potassium persulfate and 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide] are more preferred.
• the amount of the polymerization initiator added is preferably 0.03 parts by weight or more, and preferably 4.0 parts by weight or less, more preferably 0.05 parts by weight or more, and more preferably 3.6 parts by weight or less, relative to 100 parts by weight of the raw material monomer.
• the amount of the polymerization initiator added is preferably 0.03 to 4.0 parts by weight, and more preferably 0.05 to 3.6 parts by weight, relative to 100 parts by weight of the raw material monomer.
• a chain transfer agent having an S atom is preferably used, and examples thereof include 3-mercapto-1,2-propanediol, 3-mercapto-1-propanol, 3-mercapto-2-butanol, 8-mercapto-1-octanol, 2-mercaptobenzimidazole, mercaptosuccinic acid, and mercaptoacetic acid. Of these, 3-mercapto-1,2-propanediol is preferably used.
• the amount of the chain transfer agent added is preferably 0.01 parts by weight or more, more preferably 0.02 parts by weight or more, and preferably 10.0 parts by weight or less, more preferably 5.0 parts by weight or less, relative to 100 parts by weight of the raw material monomer.
• the amount of the chain transfer agent added is preferably 0.01 to 10.0 parts by weight, more preferably 0.02 to 5.0 parts by weight, relative to 100 parts by weight of the raw material monomer.
• the temperature during polymerization is preferably 50°C or higher, more preferably 60°C or higher, and is preferably 90°C or lower, more preferably 80°C or lower.
• the temperature during polymerization is preferably 50 to 90°C, more preferably 60 to 80°C.
• a vehicle composition can be prepared using the (meth)acrylic resin particles and a solvent containing an organic solvent.
• the present invention also includes a vehicle composition containing the above-mentioned (meth)acrylic resin particles and a solvent containing an organic solvent.
• the content of the (meth)acrylic resin particles in the vehicle composition is preferably 5% by weight or more, more preferably 10% by weight or more, and is preferably 50% by weight or less, more preferably 40% by weight or less.
• the content of the (meth)acrylic resin particles is preferably 5 to 50% by weight, more preferably 10 to 40% by weight.
• the vehicle composition contains an organic solvent.
• the organic solvent include alcohols such as aliphatic alcohols, glycols, terpene alcohols, and aromatic alcohols, aromatic hydrocarbons, esters, ketones, and N-methylpyrrolidone.
• the aliphatic alcohols include ethanol, propanol, isopropanol, heptanol, octanol, decanol, tridecanol, lauryl alcohol, tetradecyl alcohol, cetyl alcohol, 2-ethyl-1-hexanol, octadecyl alcohol, hexadecenol, oleyl alcohol, texanol, 2-butyl-2-ethyl-1,3-propanediol, and neopentyl glycol.
• glycols examples include ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoisobutyl ether, butyl carbitol, ethylene glycol monoethyl ether acetate, trimethylpentanediol monoisobutyrate, butyl carbitol acetate, Texanol, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, and ethylene glycol ethyl ether.
• terpene alcohols examples include terpineol, dihydroterpineol, terpineol acetate, and dihydroterpineol acetate.
• the aromatic alcohols include benzyl alcohol.
• the aromatic hydrocarbons include toluene and the like.
• esters include methyl acetate, ethyl acetate, butyl acetate, hexyl acetate, dodecyl acetate, isoamyl acetate, butyl butyrate, butyl lactate, dioctyl phthalate, and dioctyl adipate.
• ketones examples include methyl isobutyl ketone, methyl ethyl ketone, methyl isobutyl ketone, and isophorone.
• esters are preferred, with methyl acetate, ethyl acetate, butyl acetate, hexyl acetate and dodecyl acetate being more preferred, and ethyl acetate, butyl acetate and hexyl acetate being even more preferred.
• the organic solvent preferably has an average carbon number Cs of ester substituents calculated by the following formula of 3 or more and 7 or less.
• the average carbon number Cs is preferably 3.5 or more, and more preferably 4.5 or less.
• the average carbon number Cs is preferably 3 to 7, and more preferably 3.5 to 4.5.
• Average number of carbon atoms of ester substituents of organic solvents Cs cs1 x ws1 + cs2 x ws2 + ... + csn x wsn (csn: number of carbon atoms of ester substituents in each organic solvent, wsn: weight fraction of each organic solvent in the organic solvent)
• the ratio (Cs/Cp) of the average number of carbon atoms Cs of the ester substituents of the organic solvent to the average number of carbon atoms Cp of the ester substituents of the (meth)acrylic resin particles in the vehicle composition is preferably 0.3 or more and 3.0 or less, from the viewpoint of strength of a molded article.
• the Cs/Cp ratio is preferably 0.5 or more and more preferably 1.5 or less.
• the Cs/Cp ratio is preferably 0.3 to 3.0 and more preferably 0.5 to 1.5.
• the content of the organic solvent in the vehicle composition is not particularly limited, but is preferably 65% by weight or more, more preferably 70% by weight or more, and is preferably 90% by weight or less, more preferably 85% by weight or less.
• the content of the organic solvent is preferably 65 to 90% by weight, more preferably 70 to 85% by weight.
• the solvent preferably further contains water.
• the water content in the solvent is preferably 100 ppm by weight or more and 11,500 ppm by weight or less. By including water in the above range, compatibility with the dispersant improves and low-temperature decomposition properties are further improved.
• the water content in the solvent is preferably 300 ppm by weight or more, more preferably 400 ppm by weight or more, more preferably 1000 ppm by weight or less, and even more preferably 700 ppm by weight or less.
• the water content is preferably 100 to 11500 ppm by weight, more preferably 300 to 1000 ppm by weight, and even more preferably 400 to 700 ppm by weight.
• the water content in the vehicle composition is preferably 100 ppm by weight or more, and preferably 10,000 ppm by weight or less.
• the water content is preferably 100 to 10,000 ppm by weight.
• the content of the solvent in the vehicle composition is not particularly limited, but is preferably 65% by weight or more, more preferably 70% by weight or more, and is preferably 90% by weight or less, and more preferably 85% by weight or less.
• the content of the solvent is preferably 65 to 90% by weight, and more preferably 70 to 85% by weight.
• the method for producing the vehicle composition includes, for example, adding an organic solvent, water, etc. to the (meth)acrylic resin particles obtained by the above method and stirring and mixing them.
• the content of the (meth)acrylic resin particles in the slurry composition is preferably 3% by weight or more, preferably 5% by weight or more, and preferably 10% by weight or less, and preferably 8% by weight or less.
• the content of the (meth)acrylic resin particles is preferably 3 to 10% by weight, and more preferably 5 to 8% by weight.
• the content of the solvent in the slurry composition is preferably 25% by weight or more, preferably 30% by weight or more, and preferably 70% by weight or less, and preferably 60% by weight or less.
• the content of the solvent is preferably 25 to 70% by weight, and more preferably 30 to 60% by weight.
• the slurry composition contains inorganic particles.
• the inorganic particles are not particularly limited, and examples thereof include glass powder, ceramic powder, phosphor particles, silicon oxide particles, metal particles, and the like.
• the glass powder is not particularly limited, and examples thereof include glass powders such as bismuth oxide glass, silicate glass, lead glass, zinc glass, and boron glass, as well as glass powders of various silicon oxides such as CaO-Al 2 O 3 -SiO 2 , MgO-Al 2 O 3 -SiO 2 , and LiO 2 -Al 2 O 3 -SiO 2 .
• SnO-B 2 O 3 -P 2 O 5 -Al 2 O 3 mixture there are also used SnO-B 2 O 3 -P 2 O 5 -Al 2 O 3 mixture, PbO-B 2 O 3 -SiO 2 mixture, BaO-ZnO-B 2 O 3 -SiO 2 mixture, ZnO-Bi 2 O 3 -B 2 O 3 -SiO 2 mixture, Bi 2 O 3 -B 2 O 3 -BaO-CuO mixture, Bi 2 O 3 -ZnO-B 2 O 3 -Al 2 O 3 -SrO mixture, ZnO-Bi 2 O 3 -B 2 O 3 mixture, Bi 2 O 3 -SiO 2 mixture, P 2 O 5 -Na 2 O-CaO-BaO-Al 2 O 3 -B 2 O 3 mixture, P 2 O 5 -SnO mixture, P 2 O 5 -SnO-B 2 O 3 mixture, P 2 O 5 -SnO-S
• a glass powder of a PbO-B 2 O 3 -SiO 2 mixture, or a lead-free glass powder such as a lead-free BaO-ZnO-B 2 O 3 -SiO 2 mixture or a lead-free ZnO-Bi 2 O 3 -B 2 O 3 -SiO 2 mixture is preferred.
• the ceramic powder is not particularly limited, and examples thereof include alumina, ferrite, zirconia, zircon, barium zirconate, calcium zirconate, titanium oxide, barium titanate, strontium titanate, calcium titanate, magnesium titanate, zinc titanate, lanthanum titanate, neodymium titanate, lead zirconate, alumina nitride, silicon nitride, boron nitride, boron carbide, barium stannate, calcium stannate, magnesium silicate, mullite, steatite, cordierite, and forsterite.
• ITO, FTO, niobium oxide, vanadium oxide, tungsten oxide, lanthanum strontium manganite, lanthanum strontium cobalt ferrite, yttrium stabilized zirconia, gadolinium doped ceria, nickel oxide, lanthanum chromite, and the like can also be used.
• the phosphor particles are not particularly limited, and for example, the phosphor material may be a blue phosphor material, a red phosphor material, a green phosphor material, etc., which are conventionally known as phosphor materials for displays.
• the blue phosphor material may be MgAl10O17 :Eu, Y2SiO5 :Ce-based, CaWO4 :Pb-based, BaMgAl14O23 : Eu - based, BaMgAl16O27 :Eu- based , BaMg2Al14O23 : Eu-based, BaMg2Al14O27 :Eu - based, or ZnS:(Ag, Cd )-based.
• red phosphor materials examples include Y2O3 : Eu-based, Y2SiO5:Eu-based, Y3Al5O12 : Eu - based , Zn3 ( PO4 ) 2 :Mn-based, YBO3 :Eu-based, (Y,Gd) BO3 :Eu-based, GdBO3 :Eu-based, ScBO3 :Eu-based, and LuBO3 :Eu-based materials.
• the green phosphor material for example, Zn2SiO4 :Mn - based, BaAl12O19 :Mn - based, SrAl13O19 :Mn - based, CaAl12O19 :Mn-based, YBO3 :Tb-based, BaMgAl14O23:Mn - based, LuBO3 :Tb - based, GdBO3 :Tb - based, ScBO3 :Tb- based , and Sr6Si3O3Cl4 : Eu-based materials are used.
• ZnO:Zn-based, ZnS:(Cu,Al)-based, ZnS :Ag-based, Y2O2S :Eu-based, ZnS:Zn-based, (Y,Cd) BO3 :Eu-based, and BaMgAl12O23 : Eu-based can also be used.
• the metal particles are not particularly limited, and examples thereof include powders of iron, copper, nickel, palladium, platinum, gold, silver, aluminum, tungsten, and alloys thereof.
• metals such as copper and iron, which have good adsorption properties with carboxyl groups, amino groups, amide groups, etc. and are easily oxidized, can also be preferably used. These metal particles may be used alone or in combination of two or more kinds.
• various carbon blacks, carbon nanotubes, etc. may be used in addition to metal complexes.
• the inorganic particles preferably contain lithium or titanium.
• the average particle size of the inorganic particles is preferably 0.01 ⁇ m or more, and preferably 5 ⁇ m or less, more preferably 0.05 ⁇ m or more, more preferably 3 ⁇ m or less, even more preferably 0.1 ⁇ m or more, and even more preferably 1 ⁇ m or less.
• the average particle size of the inorganic particles is preferably 0.01 to 5 ⁇ m, more preferably 0.05 to 3 ⁇ m, and even more preferably 0.1 to 1 ⁇ m.
• the average particle size can be determined, for example, by measuring the volume average particle size using a laser diffraction/scattering type particle size distribution measuring device.
• the content of the inorganic particles in the slurry composition is preferably 30% by weight or more and 90% by weight or less, and within this range, the composition has sufficient viscosity, excellent coatability, and excellent dispersibility of the inorganic particles.
• the content of the inorganic particles is preferably 40% by weight or more, and more preferably 70% by weight or less.
• the content of the inorganic particles is preferably 30 to 90% by weight, and more preferably 40 to 70% by weight.
• the slurry composition contains a dispersant.
• Suitable examples of the dispersant include fatty acids, aliphatic amines, alkanolamides, and phosphoric esters. Silane coupling agents may also be used.
• the fatty acid is not particularly limited, and examples thereof include saturated fatty acids such as behenic acid, stearic acid, palmitic acid, myristic acid, lauric acid, capric acid, caprylic acid, coconut fatty acid, etc., and unsaturated fatty acids such as oleic acid, linoleic acid, linolenic acid, sorbic acid, beef tallow fatty acid, and hardened castor fatty acid, etc.
• lauric acid, stearic acid, oleic acid, etc. are preferred.
• the aliphatic amine is not particularly limited, and examples thereof include laurylamine, myristylamine, cetylamine, stearylamine, oleylamine, alkyl(coconut)amine, alkyl(hardened beef tallow)amine, alkyl(beef tallow)amine, and alkyl(soybean)amine.
• the alkanolamide is not particularly limited, and examples thereof include coconut fatty acid diethanolamide, beef tallow fatty acid diethanolamide, lauric acid diethanolamide, and oleic acid diethanolamide.
• the phosphate ester is not particularly limited, and examples thereof include polyoxyethylene alkyl ether phosphate ester and polyoxyethylene alkyl allyl ether phosphate ester.
• the content of the dispersant in the slurry composition is preferably 0.1% by weight or more, more preferably 0.15% by weight or more, and is preferably 1.5% by weight or less, and preferably 1.0% by weight or less.
• the content of the dispersant is preferably 0.1 to 1.5% by weight, and more preferably 0.15 to 1.0% by weight.
• the above-mentioned slurry composition may further contain additives such as a plasticizer and a surfactant.
• a plasticizer include di(butoxyethyl) adipate, dibutoxyethoxyethyl adipate, triethylene glycol dibutyl, triethylene glycol bis(2-ethylhexanoate), triethylene glycol dihexanoate, triethyl acetyl citrate, tributyl acetyl citrate, diethyl acetyl citrate, dibutyl acetyl citrate, dibutyl sebacate, triacetin, diethyl acetyloxymalonate, and diethyl ethoxymalonate.
• the surfactant is not particularly limited, and examples thereof include cationic surfactants, anionic surfactants, and nonionic surfactants.
• the nonionic surfactant is not particularly limited, but is preferably a nonionic surfactant having an HLB value of 10 or more and 20 or less.
• the HLB value is used as an index representing the hydrophilicity and lipophilicity of a surfactant, and several calculation methods have been proposed.
• the saponification value is S
• the acid value of the fatty acid constituting the surfactant is A
• the HLB value is defined as 20 (1-S/A).
• a nonionic surfactant having a polyethylene oxide in which an alkylene ether is added to an aliphatic chain is suitable, and specifically, for example, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, etc. are preferably used.
• the nonionic surfactant has good thermal decomposition properties, but if added in a large amount, the thermal decomposition properties of the inorganic particle dispersion slurry composition may decrease, so the preferred upper limit of the content is 5% by weight.
• the viscosity of the slurry composition is not particularly limited, but the viscosity measured at 25° C. using a B-type viscometer is preferably 200 mPa ⁇ s or more, more preferably 500 mPa ⁇ s or more, and is preferably 100,000 mPa ⁇ s or less, more preferably 50,000 mPa ⁇ s or less.
• the viscosity is preferably 200 to 100,000 mPa ⁇ s, more preferably 500 to 50,000 mPa ⁇ s.
• the method for preparing the slurry composition is not particularly limited, and examples thereof include conventionally known stirring methods, specifically, for example, a method in which the vehicle composition, the inorganic particles, the dispersant, and other components such as additional solvents and plasticizers added as necessary are stirred with a three-roll mill or the like.
• the order of addition of the components of the slurry composition can be set appropriately.
• the present invention also includes a method for producing an electronic component using the above-mentioned slurry composition.
• the electronic components include die attachment paste (ACP), die attachment film (ACF), TSV, TGV via electrodes, touch panels, various circuits for RFID and sensor substrates, various die bonding agents, sealing agents for MEMS devices, solar cells, multilayer ceramic capacitors, LTCC, silicon capacitors, electrode materials for all-solid-state batteries, etc.
• the material can also be used for antibacterial materials, electromagnetic wave shields, catalysts, fluorescent materials, etc.
• the slurry composition is applied onto a support film which has been subjected to a release treatment on one side, the organic solvent is dried, and the film is molded to produce an inorganic particle dispersion molded product.
• the shape of the inorganic particle dispersion molded product is not particularly limited, but may be, for example, a sheet.
• Examples of a method for producing the above-mentioned inorganic particle dispersion molding include a method in which the above-mentioned slurry composition is applied to a support film by a coating method such as a roll coater, die coater, squeeze coater, or curtain coater to form a uniform coating film.
• a coating method such as a roll coater, die coater, squeeze coater, or curtain coater to form a uniform coating film.
• the support film used in producing the inorganic particle dispersion molding is preferably a resin film that is heat-resistant, solvent-resistant, and flexible.
• the flexibility of the support film allows the inorganic particle dispersion slurry composition to be applied to the surface of the support film by a roll coater, blade coater, or the like, and the resulting inorganic particle dispersion sheet-forming film can be stored and supplied in a rolled-up state.
• the resin that forms the support film examples include polyethylene terephthalate, polyester, polyethylene, polypropylene, polystyrene, polyimide, polyvinyl alcohol, polyvinyl chloride, fluorine-containing resins such as polyfluoroethylene, nylon, and cellulose.
• the thickness of the support film is preferably, for example, 10 to 100 ⁇ m.
• the surface of the support film is preferably subjected to a release treatment, which allows the support film to be easily peeled off in the transfer step.
• the above slurry composition can be applied and dried to produce a molded product in which inorganic particles are dispersed. Furthermore, by using the above-mentioned slurry composition and inorganic particle dispersion molding for an external electrode conductive paste, a multilayer ceramic capacitor, which is an electronic component, can be produced.
• the method for manufacturing the multilayer ceramic capacitor includes a manufacturing method including a step of printing and drying a conductive paste on the inorganic particle dispersion molding to produce a dielectric sheet, and a step of laminating the dielectric sheets.
• the conductive paste contains a conductive powder.
• the material of the conductive powder is not particularly limited as long as it is a material having conductivity, and examples thereof include nickel, palladium, platinum, gold, silver, copper, molybdenum, tin, and alloys thereof. These conductive powders may be used alone or in combination of two or more kinds.
• the method for printing the conductive paste is not particularly limited, and examples include screen printing, die coat printing, offset printing, gravure printing, inkjet printing, etc.
• dielectric sheets printed with the conductive paste are stacked to produce a raw ceramic laminate, which is then fired in a reducing atmosphere at a temperature of 300 to 1500°C, resulting in a large number of component elements.
• a conductive paste for external electrodes containing the above-mentioned (meth)acrylic resin particles is applied to both end surfaces of each of these component elements by immersion, and then this is dried at 100 to 200°C and then fired at 300 to 800°C in a reducing atmosphere to form external electrodes on both ends of the component elements.
• the present invention provides (meth)acrylic resin particles that exhibit excellent low-temperature decomposition properties, can produce molded products with high strength, and can be used to produce ceramic laminates with excellent properties by achieving further multi-layering and thinning. It also provides a vehicle composition, a slurry composition, and a method for producing electronic components that contain the (meth)acrylic resin particles.
• Examples 1 to 18, Comparative Examples 1 to 4 Preparation of (meth)acrylic resin particles
• a 2 L separable flask equipped with a stirrer, a cooler, a thermometer, a hot water bath, and a nitrogen gas inlet was prepared, and 100 parts by weight of monomers in total were charged into the 2 L separable flask so as to obtain the composition shown in Table 1. Furthermore, 900 parts by weight of water was mixed to obtain a monomer mixture.
• MMA methyl methacrylate
• EMA ethyl methacrylate
• nBMA n-butyl methacrylate
• iBMA isobutyl methacrylate
• EHMA 2-ethylhexyl methacrylate
• HEMA hydroxyethyl methacrylate
• LMA n-lauryl methacrylate
• the resulting monomer mixture was bubbled with nitrogen gas for 20 minutes to remove dissolved oxygen, and then the atmosphere in the separable flask was replaced with nitrogen gas and the water bath was heated with stirring until it reached 80° C. Thereafter, a chain transfer agent and a polymerization initiator were added in the amounts shown in Table 1 to initiate polymerization. After 7 hours from the start of polymerization, the polymerization was terminated by cooling to room temperature. The resulting resin solution was then dried in an oven at 100° C. to remove water, thereby obtaining (meth)acrylic resin particles.
• the chain transfer agent and polymerization initiator used were as follows: ⁇ Chain Transfer Agent> CT-1: 3-mercapto-1,2-propanediol ⁇ polymerization initiator> KPS: Potassium persulfate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) VA-086: 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide] (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.)
• the dispersants and inorganic particles used were as follows: ⁇ Dispersant> Nopcosperse 092 (manufactured by Sanyo Chemical Industries, Ltd.) ⁇ Inorganic particles> Barium titanate (BT-02, Sakai Chemical Industry Co., Ltd., average particle size 0.2 ⁇ m)
• Average carbon numbers Cp and Cs of ester substituents The average number of carbon atoms Cp of the ester substituent of the (meth)acrylic resin particles and the average number of carbon atoms Cs of the ester substituent of the organic solvent were calculated by the following method.
• Weight concentration of S atoms contained in (meth)acrylic resin particles [(weight of S atoms contained in all monomers+weight of S atoms contained in all chain transfer agents+weight of S atoms contained in all polymerization initiators)/(weight of all monomers+weight of all chain transfer agents+weight of all polymerization initiators)] ⁇ 100
• Weight concentration of K atoms contained in (meth)acrylic resin particles [(weight of K atoms contained in all monomers+weight of K atoms contained in all chain transfer agents+weight of K atoms contained in all polymerization initiators)/(weight of all monomers+weight of all chain transfer agents+weight of all polymerization initiators)] ⁇ 100
• Weight concentration of OH groups contained in (meth)acrylic resin particles [(weight of OH groups contained in all monomers+weight of OH groups contained in all chain transfer agents+weight of OH groups contained in all polymerization initiators)/(weight of all monomers+weight of all chain transfer agents+weight of all polymerization initiators
• the glass transition temperature (Tg) of the obtained (meth)acrylic resin particles was measured using a differential scanning calorimeter (DSC).
• (meth)acrylic resin particles that exhibit excellent low-temperature decomposition properties, can provide molded products with high strength, and can be further multi-layered and thinned to produce ceramic laminates with excellent properties. It is also possible to provide a vehicle composition, a slurry composition, and a method for producing electronic parts that contain the (meth)acrylic resin particles.

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