WO2020196664A1 - 樹脂組成物、膜、及び硬化物 - Google Patents
樹脂組成物、膜、及び硬化物 Download PDFInfo
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- WO2020196664A1 WO2020196664A1 PCT/JP2020/013448 JP2020013448W WO2020196664A1 WO 2020196664 A1 WO2020196664 A1 WO 2020196664A1 JP 2020013448 W JP2020013448 W JP 2020013448W WO 2020196664 A1 WO2020196664 A1 WO 2020196664A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5435—Silicon-containing compounds containing oxygen containing oxygen in a ring
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/544—Silicon-containing compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
- C08K2003/2213—Oxides; Hydroxides of metals of rare earth metal of cerium
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2258—Oxides; Hydroxides of metals of tungsten
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
Definitions
- the present disclosure relates to resin compositions, membranes, and cured products.
- Ultrasonic reflectors are used in medical ultrasonic diagnostic equipment, vehicle-to-vehicle distance detection systems, obstacle detection, buried pipe corrosion checkers, concrete crack detection, earphones, speaker and other acoustic materials, and noise reduction. Higher definition, simplification of the system, etc. are desired (for example, Patent Document 1).
- Ultrasonic signals may be reflected at the interface of different materials and interact with the transmitted signal.
- the interaction between the transmitted signal and the reflected signal makes it possible to amplify the ultrasonic signal.
- the reflection of this ultrasonic signal is due to the difference in acoustic impedance, which is the product of density and speed of sound, between different materials. Therefore, for example, it is considered that a material having a high specific gravity (that is, high density) can be used as an ultrasonic reflector for amplifying an ultrasonic signal. It is also desired that such a material having a high specific gravity has an insulating property in order to prevent conduction and has an adhesive property with a base material.
- Means for solving the above problems include the following aspects.
- the resin composition according to ⁇ 1>, wherein the resin having a polar group contains a resin having a weight average molecular weight of 10,000 or more.
- ⁇ 3> The resin composition according to ⁇ 1> or ⁇ 2>, wherein the polar group contains at least one heteroatom selected from the group consisting of a nitrogen atom, an oxygen atom, and a sulfur atom.
- the resin having a polar group contains at least one selected from the group consisting of a polyamide-imide resin, an epoxy resin, an acrylic resin, a polyester resin, and a polyether resin.
- ⁇ 5> The resin composition according to any one of ⁇ 1> to ⁇ 4>, wherein the volume average particle diameter of the insulating filler having a specific gravity of 6.0 or more is 2.0 ⁇ m or less.
- ⁇ 6> Any of ⁇ 1> to ⁇ 5>, wherein the insulating filler having a specific gravity of 6.0 or more contains at least one selected from the group consisting of bismuth oxide, cerium oxide, barium titanate, and tungsten oxide.
- the resin composition according to item 1. ⁇ 7> The resin composition according to any one of ⁇ 1> to ⁇ 6>, which further contains a coupling agent.
- ⁇ 9> The resin composition according to any one of ⁇ 1> to ⁇ 8>, which further contains a solvent.
- ⁇ 11> The film according to ⁇ 10>, wherein the maximum height Rz is 10.0 ⁇ m or less.
- ⁇ 12> The film according to ⁇ 10> or ⁇ 11>, wherein the arithmetic mean roughness Ra is 1.5 ⁇ m or less.
- ⁇ 13> The film according to any one of ⁇ 10> to ⁇ 12>, which is used as an ultrasonic reflector.
- ⁇ 14> A cured product obtained by curing the resin composition according to any one of ⁇ 1> to ⁇ 9>.
- ⁇ 15> The cured product according to ⁇ 14>, wherein the maximum height Rz is 10.0 ⁇ m or less.
- ⁇ 16> The cured product according to ⁇ 14> or ⁇ 15>, wherein the arithmetic average roughness Ra is 1.5 ⁇ m or less.
- ⁇ 17> The cured product according to any one of ⁇ 14> to ⁇ 16>, which is used as an ultrasonic reflector.
- a resin composition capable of forming an insulating layer having a high specific gravity excellent in adhesion to a substrate, a film using the resin composition, and a cured product are provided.
- the term "process” includes not only a process independent of other processes but also the process if the purpose of the process is achieved even if the process cannot be clearly distinguished from the other process. ..
- the numerical range indicated by using "-" includes the numerical values before and after "-" as the minimum value and the maximum value, respectively.
- the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of another numerical range described stepwise. ..
- the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
- each component may contain a plurality of applicable substances.
- the content rate or content of each component is the total content rate or content of the plurality of substances present in the composition unless otherwise specified.
- a plurality of types of particles corresponding to each component may be contained.
- the particle size of each component means a value for a mixture of the plurality of particles present in the composition unless otherwise specified.
- the term "layer” or “membrane” refers to only a part of the region in addition to the case where the layer or the membrane is formed in the entire region when the region where the layer or the membrane exists is observed. The case where it is formed is also included.
- the resin composition of the present disclosure contains an insulating filler having a specific gravity of 6.0 or more and a resin having a polar group, and the content of the insulating filler having a specific gravity of 6.0 or more is the resin composition. It is 50% by volume or more with respect to the total solid content.
- the viscosity of the resin composition is preferably 10 Pa ⁇ s to 300 Pa ⁇ s, more preferably 20 Pa ⁇ s to 250 Pa ⁇ s, and 30 Pa ⁇ s to 200 Pa ⁇ s at 25 ° C. Is more preferable.
- the viscosity of the resin composition is according to JIS Z 3284-3: 2014, using an E-type rotational viscometer equipped with an SPP rotor, at 25 ° C. and 2.5 rotations / minute (rpm) for 144 seconds. It is a measured value when rotated, and is measured as an average value measured twice.
- the resin composition of the present disclosure contains an insulating filler having a specific gravity of 6.0 or more.
- the content of the insulating filler having a specific gravity of 6.0 or more is 50% by volume or more of the total solid content of the resin composition.
- Examples of the insulating filler having a specific gravity of 6.0 or more include metal oxides such as bismuth oxide, cerium oxide, and tungsten oxide; barium titanate, sintered uranium oxide, tungsten carbide, tungsten, and zirconium. Among them, at least one selected from the group consisting of bismuth oxide, cerium oxide, barium titanate, and tungsten oxide is preferable.
- One type of insulating filler may be used alone, or two or more types may be used in combination. Among them, bismuth oxide is preferable from the viewpoints of heat resistance, specific gravity, and thermogravimetric reduction when heated to 300 ° C. is less than 1% by mass.
- the volume resistivity of the insulating filler at 25 ° C. is preferably 1 ⁇ 10 6 ⁇ ⁇ cm or more, more preferably 1 ⁇ 10 8 ⁇ ⁇ cm or more, and 1 ⁇ 10 10 ⁇ ⁇ cm or more. It is more preferable to have.
- the specific gravity of the insulating filler may be 6.0 or more, and may be appropriately adjusted according to the use of the resin composition.
- the specific gravity of the insulating filler may be 7.0 or more, or 8.0 or more.
- the upper limit of the specific gravity of the insulating filler is not particularly limited.
- the upper limit of the specific gravity of the insulating filler may be 10.0 or less.
- the specific gravity of the filler is measured by the ratio of the mass of the measurement sample to the mass of pure water under the same volume of atmospheric pressure according to JIS K 0061: 2001 and JIS Z 8807: 2012. Represents the ratio of the true specific gravity of water to the true specific gravity of water.
- the insulating filler preferably has a small mass reduction rate at high temperatures from the viewpoint of stably obtaining a material having a high specific gravity.
- the mass reduction rate when the insulating filler is heated at 300 ° C. for 1 hour is preferably 1% by mass or less, more preferably 0.5% by mass or less, and 0.1% by mass or less. Is even more preferable.
- the shape of the insulating filler is not particularly limited, and may be spherical, powdery, needle-like, fibrous, plate-like, square-shaped, polyhedral, scaly, or the like.
- the particle size of the insulating filler is not particularly limited, and the volume average particle size is preferably 5.0 ⁇ m or less, more preferably 4.0 ⁇ m or less, further preferably 3.0 ⁇ m or less, 2 It is particularly preferable that the thickness is 0.0 ⁇ m or less.
- the lower limit of the volume average particle diameter is not particularly limited and may be 0.001 ⁇ m or more.
- the volume average particle size can be measured by a laser diffraction particle size distribution measuring device, and is the particle size (D50) when the integration from the small diameter side is 50% in the volume-based particle size distribution.
- D50 particle size
- the volume average particle size of the insulating filler is 2.0 ⁇ m or less, the flatness of the film or cured product using the resin composition is improved, which is preferable.
- the volume average particle size of the insulating filler is preferably 0.001 ⁇ m to 5.0 ⁇ m, more preferably 0.001 ⁇ m to 4.0 ⁇ m, and 0.001 ⁇ m to 3.0 ⁇ m. It is more preferably 0.001 ⁇ m to 2.0 ⁇ m.
- the content of the insulating filler in the total solid content of the resin composition is 50% by volume or more, preferably 55% by volume or more, and more preferably 60% by volume or more.
- the upper limit of the content of the insulating filler is not particularly limited, and the content of the insulating filler may be 80% by volume or less from the viewpoint of handleability of the resin composition. From the above viewpoint, the content of the insulating filler in the total solid content in the resin composition is preferably 50% by volume to 80% by volume, more preferably 55% by volume to 80% by volume, and 60% by volume. It is more preferably from% to 80% by volume.
- the solid content of the resin composition means a component obtained by removing a volatile component from the resin composition.
- the content of the insulating filler in the total solid content of the resin composition is preferably 88% by mass or more, more preferably 90% by mass or more, and further preferably 92% by mass or more.
- the upper limit of the content of the insulating filler in the total solid content of the resin composition is not particularly limited and may be 99% by mass or less. From the above viewpoint, the content of the insulating filler in the total solid content of the resin composition is preferably 88% by mass to 99% by mass, more preferably 90% by mass to 99% by mass, and 92. It is more preferably mass% to 99% by mass.
- the resin composition may or may not contain other fillers in addition to the insulating filler having a specific gravity of 6.0 or more.
- the resin composition may contain an insulating filler having a specific gravity of less than 6.0.
- the content of the insulating filler having a specific gravity of 6.0 or more with respect to the total mass of the filler is preferably 60% by mass or more, preferably 70. It is more preferably mass% or more, and further preferably 80 mass% or more.
- the total content of the filler in the total solid content of the resin composition may exceed 50% by volume and 55% by volume or more. It is more preferably 60% by volume or more, and even more preferably 65% by volume or more. Further, the upper limit of the total content of the filler in the total solid content of the resin composition in this case is not particularly limited, and may be 90% by volume or less.
- the total content of the fillers in the total solid content of the resin composition is preferably 90% by mass or more, preferably 92% by mass or more. Is more preferable, and 94% by mass or more is further preferable. Further, the upper limit of the total content of the filler in the total solid content of the resin composition in this case is not particularly limited, and may be 99% by mass or less.
- the resin composition of the present disclosure contains a resin having a polar group.
- the resin composition of the present disclosure contains 50% by volume or more of an insulating filler in order to obtain a composition having a high specific gravity.
- the base material is a film or a cured product. It is difficult to obtain sufficient adhesiveness to. Therefore, in the resin composition of the present disclosure, it is possible to achieve both adhesiveness and high specific gravity by improving the interaction with the base material by using a resin having a polar group.
- a polar group represents an atomic group having polarity due to a bond between atoms having different electronegativity.
- the polar group include a group having a hetero atom other than a carbon atom and a hydrogen atom, and more specifically, from a group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, a boron atom, a phosphorus atom, and a silicon atom.
- Examples include groups containing at least one heteroatom selected. Among them, as the polar group, a group containing at least one hetero atom selected from the group consisting of a nitrogen atom, an oxygen atom and a sulfur atom is preferable.
- polar group amino group, amide group, imide group, cyano group, nitro group, hydroxy group, carboxy group, carbonyl group, thiol group, sulfo group, thionyl group, ester bond, ether bond
- examples thereof include a sulfide bond, a urethane bond, and a urea bond, and at least one selected from the group consisting of an amide group, an imide group, a hydroxy group, an amino group, a carboxy group, a carbonyl group, and a urea bond is preferable.
- the polar group may be present in the main chain or the side chain of the resin.
- the type of resin having a polar group is not particularly limited as long as it has a polar group, and may be a thermosetting resin, a thermoplastic resin, or a combination thereof.
- a thermoplastic resin is preferable from the viewpoint of small curing shrinkage during curing, and a combination of a thermoplastic resin and a thermosetting resin is used from the viewpoint of improving the strength of the film after film formation and suppressing the curing shrinkage during curing. Is more preferable.
- the resin component may be in the state of a monomer having a functional group capable of causing a polymerization reaction by heating or in the state of a polymer already polymerized.
- the resin having a polar group examples include vinyl polymerization resin having a polar group, acrylic resin, polyamide resin, polyimide resin, polyamideimide resin, polyurethane resin, polyester resin, polyether resin, epoxy resin, and oxazine resin. , Bismaleimide resin, phenol resin, unsaturated polyester resin, silicone resin and the like. Among them, at least one selected from the group consisting of polyamide-imide resin, epoxy resin, acrylic resin, polyester resin, and polyether resin is preferable. One type of resin may be used alone, or two or more types may be used in combination.
- a polyamide-imide resin is preferable from the viewpoint of adhesiveness
- an epoxy resin is preferable from the viewpoint of heat resistance.
- the polyamide-imide resin and the epoxy resin may be used in combination.
- the mass ratio of the polyamide-imide resin to the epoxy resin is not particularly limited and may be 20/80 to 80/20, or 30/70 to 70 /. It may be 30 or 40/60 to 60/40.
- the resin having a polar group may be polymerized in combination with a curing agent.
- a curing agent for example, an acid anhydride-based curing agent, an amine-based curing agent, a phenol-based curing agent, a mercaptan-based curing agent or other heavy-addition curing agent, or a latent curing agent such as imidazole is used in combination with an epoxy resin for polymerization. It may be the one that has been used.
- epoxy resin examples include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, hydrogenated bisphenol A type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, and naphthalene type epoxy resin. , Biphenol type epoxy resin, biphenyl novolac type epoxy resin, ring type aliphatic epoxy resin and the like.
- the epoxy resin include those having a substituent such as an ether group and an alicyclic epoxy group in the above-mentioned epoxy resin.
- an epoxy resin having a hetero atom other than the oxygen atom derived from the epoxy group or the glycidyloxy group of the epoxy resin is preferable.
- a preferable epoxy resin is, for example, an epoxy resin containing a nitrogen atom and a hydrogen atom bonded to the nitrogen atom.
- the epoxy resin may have a heterocyclic structure containing a nitrogen atom and a hydrogen atom bonded to the nitrogen atom. Examples of such a heterocyclic structure include a glycoluril structure.
- the content of the epoxy resin with respect to the total amount of the resin may be 100% by mass, 10% by mass to 90% by mass, or 20% by mass to 80% by mass. It may be 30% by mass to 70% by mass, or 40% by mass to 60% by mass.
- the content of the epoxy resin with respect to the solid content of the resin composition may be 0.01% by mass to 10% by mass, or 0.1% by mass to 9% by mass. It may be 1% by mass to 8% by mass.
- polyamide-imide resin a polyamide-imide resin having an amide bond and an imide bond in the main chain is preferable.
- Preferred specific examples of the polyamide-imide resin include a polyamide-imide resin having at least one of a polyalkylene oxide structure and a polysiloxane structure. These polyamide-imide resins are preferable from the viewpoint of relaxing stress due to deformation of the polyamide-imide resin.
- These polyamide-imide resins may be, for example, a polyamide-imide resin synthesized by using a polyalkylene oxide-modified diamine and a polysiloxane-modified diamine, respectively.
- an alkylene oxide structure having 1 to 10 carbon atoms is preferable, an alkylene oxide structure having 1 to 8 carbon atoms is more preferable, and an alkylene oxide structure having 1 to 4 carbon atoms is more preferable.
- An alkylene oxide structure is more preferred.
- a polypropylene oxide structure is preferable as the polyalkylene oxide structure.
- the alkylene group in the alkylene oxide structure may be linear or branched.
- the unit structure in the polyalkylene oxide structure may be one type or two or more types.
- an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 18 carbon atoms is bonded as a substituent to a part or all of the silicon atoms of the polysiloxane structure.
- Examples include the polysiloxane structure.
- Alkyl groups having 1 to 20 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, t-butyl group, n-octyl group, 2-ethylhexyl group, n-dodecyl group and the like. Can be mentioned.
- the aryl group having 6 to 18 carbon atoms may be unsubstituted or substituted with a substituent.
- substituent when the aryl group has a substituent include a halogen atom, an alkoxy group, and a hydroxy group.
- the aryl group having 6 to 18 carbon atoms include a phenyl group, a naphthyl group, a benzyl group and the like. Among these, a phenyl group is preferable.
- the alkyl group having 1 to 20 carbon atoms or the aryl group having 6 to 18 carbon atoms may be used alone or in combination of two or more.
- a preferred embodiment of the polyamide-imide resin is a polyamide-imide resin having a structural unit derived from diimide carboxylic acid or a derivative thereof and a structural unit derived from aromatic diisocyanate or aromatic diamine.
- the method for producing a polyamide-imide resin having a structural unit derived from diimide carboxylic acid or a derivative thereof and a structural unit derived from aromatic diisocyanate or aromatic diamine is not particularly limited, and examples thereof include the isocyanate method and the acid chloride method. Be done.
- the isocyanate method a polyamide-imide resin is synthesized using a diimide carboxylic acid and an aromatic diisocyanate.
- a polyamide-imide resin is synthesized using a diimide carboxylic acid chloride and an aromatic diamine.
- the isocyanate method synthesized from diimide carboxylic acid and aromatic diisocyanate is more preferable because it is easy to optimize the structure of the polyamide-imide resin.
- the content of the polyamide-imide resin with respect to the total amount of the resin may be 80% by mass or more, 90% by mass or more, or 100% by mass. ..
- the content of the polyamide resin with respect to the total amount of the resin may be 10% by mass to 90% by mass, 20% by mass to 80% by mass, or 30% by mass to 70% by mass. It may be 40% by mass to 60% by mass.
- the content of the polyamide-imide resin with respect to the solid content of the resin composition may be 0.01% by mass to 10% by mass, or 0.1% by mass to 9% by mass. It may be 1% by mass to 8% by mass.
- the weight average molecular weight of the resin having a polar group is not particularly limited, and is preferably 10,000 or more, and may be 20,000 or more, or 50,000 or more. When the weight average molecular weight of the resin is 10,000 or more, dusting on the surface tends to be suppressed when the resin composition is dried to prepare a film.
- the upper limit of the weight average molecular weight is not particularly limited, and may be 1,000,000 or less, or 900,000 or less.
- the weight average molecular weight of the polymerized resin is preferably in the above range.
- each resin independently has a weight average molecular weight in the above range.
- the weight average molecular weight of the resin is measured using gel permeation chromatography with polystyrene as the standard material.
- the content of the resin having a polar group in the resin composition is not particularly limited, and may be 2% by mass to 12% by mass with respect to the solid content of the resin composition from the viewpoint of adjusting the adhesiveness and the specific gravity. It is preferably 3% by mass to 10% by mass, more preferably 4% by mass to 9% by mass.
- the resin composition may contain a resin having no polar group in addition to the resin having a polar group.
- the content of the resin having a polar group with respect to the total amount of the resin is preferably 60% by mass or more, more preferably 70% by mass or more, further preferably 80% by mass or more, and 90% by mass or more. Is particularly preferable.
- the total content of the resin in the resin composition (that is, the total content of the resin having a polar group and the resin having no polar group present in some cases) may be 0.01% by mass to 10% by mass. , 0.1% by mass to 9% by mass, or 1% by mass to 8% by mass.
- the weight average molecular weight of the resin having no polar group is not particularly limited, and is preferably 10,000 or more, preferably 20,000 or more. It may be 50,000 or more. When the weight average molecular weight of the resin is 10,000 or more, dusting on the surface tends to be suppressed when the resin composition is dried to prepare a film.
- the upper limit of the weight average molecular weight is not particularly limited, and may be 1,000,000 or less, or 900,000 or less.
- the weight average molecular weight of the polymerized resin is preferably in the above range. When a plurality of types of resins are contained in the resin composition, it is preferable that each resin independently has a weight average molecular weight in the above range.
- the resin composition contains both a resin having a weight average molecular weight of 10,000 or more and a resin having a weight average molecular weight of less than 10,000, the latter ratio shall be 30% by mass or less with respect to the entire resin. Is more preferable, and it is more preferably 20% by mass or less, and further preferably 10% by mass or less.
- the proportion of the resin having a weight average molecular weight of less than 10,000 in the resin composition after the resin is polymerized is in the above range. Is preferable.
- the resin composition may further contain a curing agent.
- the curing agent includes an acid anhydride-based curing agent, an amine-based curing agent, a phenol-based curing agent, a mercaptan-based curing agent and other heavy-addition curing agents, and imidazole and the like. Examples include latent curing agents.
- the content of the curing agent may be 0.1% by mass to 50% by mass, 1% by mass to 30% by mass, or 1% by mass to 20% by mass with respect to the total solid content of the resin composition. It may be%, and it may be 1% by mass to 10% by mass.
- the ratio of the equivalent number of functional groups of the thermosetting resin to the equivalent number of functional groups of the curing agent having reactivity with the functional group of the thermosetting resin may be 1: 1 to 1: 3, or 1: 1 to 1: 2.
- the resin composition may contain a coupling agent.
- the adhesiveness to the substrate when formed into a film or a cured product tends to be further improved.
- the type of coupling agent is not particularly limited, and examples of the coupling agent include silane compounds, titanium compounds, aluminum chelate compounds, and aluminum / zirconium compounds. Of these, a silane coupling agent is preferable from the viewpoint of adhesiveness to a base material such as glass.
- One type of coupling agent may be used alone, or two or more types may be used in combination.
- silane coupling agent examples include a silane coupling agent having a vinyl group, an epoxy group, a methacryl group, an acrylic group, an amino group, an isocyanurate group, a ureido group, a mercapto group, an isocyanate group, an acid anhydride group and the like.
- a silane coupling agent having an epoxy group or an amino group is preferable, and a silane coupling agent having an epoxy group or an anirino group is more preferable.
- a silane cup having an epoxy group or an amino group is used from the viewpoint of good compatibility with the polyamideimide resin and the epoxy resin. It is preferable to use a ring agent, and it is more preferable to use a silane coupling agent having an epoxy group or an anirino group.
- silane coupling agent examples include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 3-glycidoxypropylmethyldimethoxy.
- Silane 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (Aminoethyl) -3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-ureidopropyltri Examples thereof include ethoxysilane.
- the content of the coupling agent in the resin composition is not particularly limited, and is 0.05% by mass to 5% by mass with respect to the solid content of the resin composition. Is preferable, and more preferably 0.1% by mass to 2.5% by mass.
- the resin composition may contain a solvent from the viewpoint of adjusting the viscosity.
- the solvent is preferably a solvent having a boiling point of 100 ° C. or higher from the viewpoint of preventing the composition from drying in the step of applying the composition, and a boiling point of 300 ° C. or lower in order to suppress the generation of voids. It is more preferable that the solvent has.
- the type of solvent is not particularly limited, and examples thereof include alcohol-based solvents, ether-based solvents, ketone-based solvents, amide-based solvents, aromatic hydrocarbon-based solvents, ester-based solvents, and nitrile-based solvents. More specifically, methylisobutylketone, dimethylacetamide, dimethylformamide, dimethylsulfoxide, N-methyl-2-pyrrolidone, ⁇ -butyrolactone, sulfolane, cyclohexanone, methylethylketone, dimethylpropaneamide, 2- (2-hexyloxyethoxy).
- One type of solvent may be used alone, or two or more types may be used in combination.
- the solvent is preferably 0.1% by mass to 10% by mass, and 0.5% by mass to 9% by mass, based on the total amount of the resin composition, from the viewpoints of viscosity, shortening of the heating process, and the like. It is more preferably 1% by mass to 8% by mass.
- the resin composition may contain other additives if necessary.
- the additive include thixotropy, dispersant and the like.
- the thixo agent examples include 12-hydroxystearic acid, 12-hydroxystearic acid triglyceride, ethylenebisstearic acid amide, hexamethylenebisoleic acid amide, N, N'-distearyl adipic acid amide, fumed silica and the like.
- the thixotropy may be used alone or in combination of two or more.
- the content of the thixotropy is not particularly limited, and may be 0.01% by mass to 5% by mass or 0.05% by mass to 3% by mass with respect to the total solid content of the resin composition. , 0.1% by mass to 1% by mass.
- examples of the dispersant include dispersants compatible with the resin.
- the filler can be suitably dispersed and the adhesiveness to the substrate tends to be improved.
- examples of the dispersant include phosphates, carboxylates, and carboxylic acid amine salts.
- the content of the dispersant may be 0.01% by mass to 5% by mass or 0.05% by mass to 3% by mass with respect to the total solid content of the resin composition.
- the resin composition of the present disclosure may be dried and used as a film.
- the film can be produced, for example, by the following method. First, the above-mentioned resin composition is applied to at least a part of the surface of the base material to form a resin composition layer. Then, the resin composition layer is dried to obtain a film.
- the method of applying the resin composition to the substrate is not particularly limited, and examples thereof include a spray method, a screen printing method, a rotary coating method, a spin coating method, and a bar coating method. Among them, the resin composition of the present disclosure is suitable for applications using screen printing.
- the base material to which the resin composition is applied is not particularly limited, and glass, metal, resin material, metal vapor deposition film, metal oxide, ceramic, non-woven fabric, glass fiber, aramid fiber, carbon fiber, glass fiber prepreg, aramid fiber prepreg, Examples include carbon fiber prepreg.
- the resin composition of the present disclosure is excellent in adhesiveness to a substrate having a polarity on the surface, such as glass, metal, metal oxide, glass fiber, aramid fiber, and glass fiber prepreg.
- the method for drying the resin composition is not particularly limited, and examples thereof include a method of heat-treating using a device such as a hot plate and an oven, and a method of naturally drying.
- the conditions for drying by heat treatment are not particularly limited as long as the solvent in the resin composition is sufficiently volatilized, and may be about 5 minutes to 120 minutes at 80 ° C. to 150 ° C. ..
- the resin composition of the present disclosure may be used as a cured product.
- the method for curing the resin composition is not particularly limited, and the resin composition can be cured by heat treatment or the like. Curing by heat treatment uses a box dryer, hot air conveyor dryer, quartz tube furnace, hot plate, rapid thermal annealing, vertical diffusion furnace, infrared curing furnace, electron beam curing furnace, microwave curing furnace, etc. Can be done.
- the maximum height Rz of the film or cured product is preferably 10.0 ⁇ m or less, more preferably 8.0 ⁇ m or less, and further preferably 6.0 ⁇ m or less. preferable.
- the arithmetic mean roughness Ra of the film or cured product is preferably 1.5 ⁇ m or less, more preferably 1.0 ⁇ m or less, further preferably 0.8 ⁇ m or less, and 0.6 ⁇ m or less. Is particularly preferable.
- the arithmetic mean roughness Ra and the maximum height Rz of the film or the cured product shall be the values obtained based on JIS B 0601: 2013. Specifically, it is a value measured using a 3D microscope (for example, VR-3200 manufactured by KEYENCE, magnification 12 times).
- the thickness of the film or the cured product is not particularly limited, and in one embodiment, it may be 10 ⁇ m to 100 ⁇ m or 10 ⁇ m to 50 ⁇ m.
- the specific gravity of the film or cured product is preferably 4.0 or more, more preferably 4.5 or more, and even more preferably 5.0 or more.
- the upper limit of the specific gravity of the film or the cured product is not particularly limited, and may be, for example, 9.0 or less. From the above viewpoint, the specific gravity of the film or the cured product may be 4.0 to 9.0, 4.5 to 9.0, or 5.0 to 9.0. ..
- the volume resistivity of the film or cured product is preferably 1.0 ⁇ 10 6 ⁇ ⁇ cm or more, more preferably 1.0 ⁇ 10 7 ⁇ ⁇ cm or more, and 1.0 ⁇ 10 8 ⁇ . -It is more preferably cm or more.
- the volume resistivity is measured according to JIS C 2139-3-1: 2018 with an insulation resistance tester (for example, Advantest, 8340A), and the volume resistivity is calculated from the area and thickness of the electrode contact surface. Can be calculated.
- the breakdown voltage of the membrane or cured product measured by the method described in Examples is preferably 5 MV / m or more, preferably 10 MV / m or more, and further preferably 15 MV / m or more. preferable.
- the resin composition of the present disclosure can be suitably used for applications in which it is particularly desirable to form an insulating layer having a high specific gravity by screen printing. Further, the resin composition of the present disclosure can be suitably used as an ultrasonic reflector.
- -Resin 1 Polyamide-imide resin (KS-9900F (trade name), Hitachi Chemical Co., Ltd.)
- -Resin 2 Epoxy resin (YX8034 (trade name), Mitsubishi Chemical Corporation)
- -Resin 3 Epoxy resin (TG-G (trade name), Shikoku Chemicals Corporation)
- Hardener Imidazole -Thixo agent 1: 12-hydroxystearic acid-Thixo agent 2: Fumed silica (Aerosil R972, Nippon Aerosil Co., Ltd.)
- Dispersant Phosphate (BYK-106 (trade name), Big Chemie Japan Co., Ltd.)
- -Coupling agent 1 N-phenyl-3-aminopropyltrimethoxysilane (KBM-573 (trade name), Shin-Etsu Chemical Co., Ltd.)
- -Coupling agent 2 3-glycidoxypropyltrimethoxysilane (KBM-403 (trade name), Shin-Ets
- ⁇ Surface roughness ⁇ The arithmetic mean roughness Ra and the maximum height Rz of the film after film formation were determined based on JIS B 0601: 2013 using a 3D microscope (for example, VR-3200 manufactured by KEYENCE, magnification 12 times).
- the film after film formation is 100 mm square using a cross-cutter test multi-blade cutter (All Good Co., Ltd.) equipped with cutter blades at 1 mm intervals. After making a grid-like cut in the central portion of the film after forming the film with a width of 8 mm and a length of 8 mm, the tape was adhered and the tape was peeled off at an angle of 45 °.
- the area of the film-forming part that was peeled from the film-forming part that was cut in a grid pattern after the tape was peeled off was photographed with a microscope, and the areas of the peeled part and the unpeeled part were image-processed by binarization to obtain the peeled part. The area was calculated. When the peeled area was less than 40% with respect to the total area of the film-forming portion, it was judged to have good adhesion.
- An electrode is connected to the copper foil surface, an electrode of ⁇ 20 mm is installed on the film-forming surface side, a dielectric breakdown test is conducted at a boosting speed of 500 V / s in the atmosphere, and the dielectric breakdown strength is determined from the dielectric breakdown voltage and the film-forming thickness. Calculated.
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Abstract
Description
<1> 比重6.0以上の絶縁性フィラーと、極性基を有する樹脂と、を含有する樹脂組成物であって、前記比重6.0以上の絶縁性フィラーの含有率が、前記樹脂組成物の全固形分に対して50体積%以上である、樹脂組成物。
<2> 前記極性基を有する樹脂が、重量平均分子量10,000以上の樹脂を含む、<1>に記載の樹脂組成物。
<3> 前記極性基が、窒素原子、酸素原子、及び硫黄原子からなる群より選択される少なくとも1つのヘテロ原子を含む、<1>又は<2>に記載の樹脂組成物。
<4> 前記極性基を有する樹脂が、ポリアミドイミド樹脂、エポキシ樹脂、アクリル樹脂、ポリエステル樹脂、及びポリエーテル樹脂からなる群より選択される少なくとも1つを含む、<1>~<3>のいずれか1項に記載の樹脂組成物。
<5> 前記比重6.0以上の絶縁性フィラーの体積平均粒子径が2.0μm以下である、<1>~<4>のいずれか1項に記載の樹脂組成物。
<6> 前記比重6.0以上の絶縁性フィラーが酸化ビスマス、酸化セリウム、チタン酸バリウム、及び酸化タングステンからなる群より選択される少なくとも1つを含む、<1>~<5>のいずれか1項に記載の樹脂組成物。
<7> さらにカップリング剤を含有する、<1>~<6>のいずれか1項に記載の樹脂組成物。
<8> 前記カップリング剤がシランカップリング剤を含む、<7>に記載の樹脂組成物。
<9> さらに溶剤を含有する、<1>~<8>のいずれか1項に記載の樹脂組成物。
<10> <1>~<9>のいずれか1項に記載の樹脂組成物を乾燥させてなる膜。
<11> 最大高さRzが10.0μm以下である、<10>に記載の膜。
<12> 算術平均粗さRaが1.5μm以下である、<10>又は<11>に記載の膜。
<13> 超音波反射材として用いられる、<10>~<12>のいずれか1項に記載の膜。
<14> <1>~<9>のいずれか1項に記載の樹脂組成物を硬化してなる硬化物。
<15> 最大高さRzが10.0μm以下である、<14>に記載の硬化物。
<16> 算術平均粗さRaが1.5μm以下である、<14>又は<15>に記載の硬化物。
<17> 超音波反射材として用いられる、<14>~<16>のいずれか1項に記載の硬化物。
本開示において「~」を用いて示された数値範囲には、「~」の前後に記載される数値がそれぞれ最小値及び最大値として含まれる。
本開示中に段階的に記載されている数値範囲において、一つの数値範囲で記載された上限値又は下限値は、他の段階的な記載の数値範囲の上限値又は下限値に置き換えてもよい。また、本開示中に記載されている数値範囲において、その数値範囲の上限値又は下限値は、実施例に示されている値に置き換えてもよい。
本開示において各成分は該当する物質を複数種含んでいてもよい。組成物中に各成分に該当する物質が複数種存在する場合、各成分の含有率又は含有量は、特に断らない限り、組成物中に存在する当該複数種の物質の合計の含有率又は含有量を意味する。
本開示において各成分に該当する粒子は複数種含んでいてもよい。組成物中に各成分に該当する粒子が複数種存在する場合、各成分の粒子径は、特に断らない限り、組成物中に存在する当該複数種の粒子の混合物についての値を意味する。
本開示において「層」又は「膜」との語には、当該層又は膜が存在する領域を観察したときに、当該領域の全体に形成されている場合に加え、当該領域の一部にのみ形成されている場合も含まれる。
本開示の樹脂組成物は、比重6.0以上の絶縁性フィラーと、極性基を有する樹脂と、を含有し、前記比重6.0以上の絶縁性フィラーの含有率は、前記樹脂組成物の全固形分に対して50体積%以上である。
本開示の樹脂組成物は比重6.0以上の絶縁性フィラーを含有する。当該比重6.0以上の絶縁性フィラーの含有率は、樹脂組成物の全固形分の50体積%以上である。
以上の観点から、絶縁性フィラーの体積平均粒子径は、0.001μm~5.0μmであることが好ましく、0.001μm~4.0μmであることがより好ましく、0.001μm~3.0μmであることがさらに好ましく、0.001μm~2.0μmであることが特に好ましい。
以上の観点から、樹脂組成物中の全固形分中の絶縁性フィラーの含有率は50体積%~80体積%であることが好ましく、55体積%~80体積%であることがより好ましく、60体積%~80体積%であることがさらに好ましい。
樹脂組成物の固形分とは、樹脂組成物から揮発成分を除いた成分を意味する。
以上の観点から、樹脂組成物の全固形分中の絶縁性フィラーの含有率は、88質量%~99質量%であることが好ましく、90質量%~99質量%であることがより好ましく、92質量%~99質量%であることがさらに好ましい。
本開示の樹脂組成物は極性基を有する樹脂を含有する。本開示の樹脂組成物は、高比重の組成物とするために絶縁性フィラーを50体積%以上含有しているが、絶縁性フィラーを高充填とすると、膜又は硬化物としたときの基材への接着性が十分に得られにくい。そこで本開示の樹脂組成物では極性基を有する樹脂を用いて基材との相互作用を向上させることで、接着性と高比重の両立を可能としている。
また、樹脂成分は加熱により重合反応を生じうる官能基を有するモノマーの状態であってもすでに重合したポリマーの状態であってもよい。極性基を有する樹脂としては、具体的には、極性基を有するビニル重合系樹脂、アクリル樹脂、ポリアミド樹脂、ポリイミド樹脂、ポリアミドイミド樹脂、ポリウレタン樹脂、ポリエステル樹脂、ポリエーテル樹脂、エポキシ樹脂、オキサジン樹脂、ビスマレイミド樹脂、フェノール樹脂、不飽和ポリエステル樹脂、シリコーン樹脂等が挙げられる。なかでも、ポリアミドイミド樹脂、エポキシ樹脂、アクリル樹脂、ポリエステル樹脂、及びポリエーテル樹脂からなる群より選択される少なくとも1つが好ましい。樹脂は1種を単独で用いても2種以上を併用してもよい。
炭素数1~20のアルキル基としては、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、t-ブチル基、n-オクチル基、2-エチルヘキシル基、n-ドデシル基等が挙げられる。これらの中でも、メチル基が好ましい。
炭素数6~18のアリール基は、無置換でも置換基で置換されていてもよい。アリール基が置換基を有する場合の置換基としては、ハロゲン原子、アルコキシ基、ヒドロキシ基等が挙げられる。炭素数6~18のアリール基としては、フェニル基、ナフチル基、ベンジル基等が挙げられる。これらの中でも、フェニル基が好ましい。
炭素数1~20のアルキル基又は炭素数6~18のアリール基は、1種を単独で用いても2種以上を併用してもよい。
ジイミドカルボン酸又はその誘導体由来の構造単位と芳香族ジイソシアネート又は芳香族ジアミン由来の構造単位とを有するポリアミドイミド樹脂の製造方法は特に限定されるものではなく、例えば、イソシアネート法及び酸クロライド法が挙げられる。
イソシアネート法では、ジイミドカルボン酸と芳香族ジイソシアネートとを用いてポリアミドイミド樹脂を合成する。酸クロライド法では、ジイミドカルボン酸塩化物と芳香族ジアミンとを用いてポリアミドイミド樹脂を合成する。ジイミドカルボン酸と芳香族ジイソシアネートから合成するイソシアネート法が、ポリアミドイミド樹脂の構造の最適化を図りやすく、より好ましい。
樹脂組成物に複数種の樹脂が含まれる場合には、それぞれの樹脂が独立に上記範囲の重量平均分子量を有することが好ましい。
樹脂の重量平均分子量は、ゲルパーミエーションクロマトグラフィーを使用し、ポリスチレンを標準物質として測定される。
樹脂組成物に複数種の樹脂が含まれる場合には、それぞれの樹脂が独立に上記範囲の重量平均分子量を有することが好ましい。
硬化剤の含有量は樹脂組成物の全固形分に対して0.1質量%~50質量%であってもよく、1質量%~30質量%であってもよく、1質量%~20質量%であってもよく、1質量%~10質量%であってもよい。
硬化剤が付加重合型の硬化剤である場合、熱硬化性樹脂の官能基の当量数と、当該熱硬化性樹脂の官能基と反応性を有する硬化剤の官能基の当量数の比率(熱硬化性樹脂の官能基の当量数:硬化剤の官能基の当量数)は、1:1~1:3であってもよく、1:1~1:2であってもよい。
樹脂組成物はカップリング剤を含有していてもよい。樹脂組成物がカップリング剤を含有すると、膜又は硬化物としたときの基材への接着性がより向上する傾向にある。
樹脂組成物は粘度を調整する観点から溶剤を含有していてもよい。溶剤は、組成物を付与する工程での組成物の乾燥を防ぐ観点から、100℃以上の沸点を有している溶剤であることが好ましく、ボイドの発生を抑制するために300℃以下の沸点を有している溶剤であることがより好ましい。
樹脂組成物は必要に応じてその他の添加剤を含有していてもよい。添加剤としては、チキソ剤、分散剤等が挙げられる。
本開示の樹脂組成物は、乾燥させて膜として用いてもよい。膜は例えば以下の方法で作製することができる。まず、上述の樹脂組成物を基材の表面の少なくとも一部に付与して樹脂組成物層を形成する。その後、樹脂組成物層を乾燥させ、膜を得る。樹脂組成物を基材に付与する方法は特に制限されず、スプレー法、スクリーン印刷法、回転塗布法、スピンコート法、バーコート法等が挙げられる。なかでも本開示の樹脂組成物はスクリーン印刷を用いる用途に好適である。
以上の観点から、膜又は硬化物の比重は4.0~9.0であってもよく、4.5~9.0であってもよく、5.0~9.0であってもよい。
膜又は硬化物の、実施例に記載の方法により測定される絶縁破壊電圧は、5MV/m以上であることが好ましく、10MV/m以上であることが好ましく、15MV/m以上であることがさらに好ましい。
以下の成分を表1に示される配合(質量%)で混合し、樹脂組成物を得た。
・樹脂2:エポキシ樹脂 (YX8034(商品名)、三菱ケミカル株式会社)
・樹脂3:エポキシ樹脂 (TG-G(商品名)、四国化成工業株式会社)
・硬化剤:イミダゾール
・チキソ剤1:12-ヒドロキシステアリン酸
・チキソ剤2:ヒュームドシリカ(アエロジルR972、日本アエロジル社)
・分散剤:リン酸塩 (BYK-106(商品名)、ビックケミージャパン株式会社)
・カップリング剤1:N-フェニル-3-アミノプロピルトリメトキシシラン(KBM-573(商品名)、信越化学工業株式会社)
・カップリング剤2:3-グリシドキシプロピルトリメトキシシラン(KBM-403(商品名)、信越化学工業株式会社)
・フィラー:酸化ビスマス(Bi2O3)(体積平均粒子径2.0μmの球状フィラー、比重8.9)
スクリーン印刷機(LS-150、ニューロング精密工業株式会社)及びスクリーンメッシュ版(WT360-16、ソノコム株式会社)を使用し、スキージ速度10mm/sec、クリアランス1.0mmにて、厚さ1.0mmのソーダガラス板に100mm角の塗膜を作製した。ソーダガラス板に作製した膜はオーブンにて120℃、1時間乾燥し製膜した。
前記製膜後の膜の算術平均粗さRa及び最大高さRzを、3D顕微鏡(例えば、キーエンス製VR-3200、倍率12倍)を用いてJIS B 0601:2013に基づいて求めた。
前記製膜後の膜をJIS K 5600-5-6:1999に準じて、1mmの間隔でカッターの刃が備え付けられたクロスカッター試験多重刃カッター(オールグッド株式会社)を使用して100mm角の製膜後の膜中央部に幅8mm、長さ8mmで碁盤目状に切り込みを入れた後、テープを接着させ45°の角度でテープを引き剥がした。テープ剥離後の碁盤目状に切り込みを入れた製膜部から剥離した製膜部の面積を顕微鏡で撮影し、剥離部と未剥離部の面積を2値化により画像処理することで剥離部の面積を算出した。剥離面積が製膜部全体の面積に対して40%未満である場合に良好な密着性を有すると判断した。
厚さ30μmの銅箔にスクリーン印刷機(LS-150、ニューロング精密工業株式会社)及びスクリーンメッシュ版(WT360-16、ソノコム株式会社)を使用し、スキージ速度10mm/sec、クリアランス1.0mmにて、100mm角の塗膜を作製した。作製した塗膜をオーブンにて120℃、1時間乾燥し製膜した。銅箔面に電極を接続し、製膜面側にΦ20mmの電極を設置し、昇圧速度500V/s、大気下で絶縁破壊試験を行い、絶縁破壊電圧と製膜の厚さから絶縁破壊強度を算出した。
厚さ1.0mmのソーダガラス板にスクリーン印刷機(LS-150、ニューロング精密工業株式会社)及びスクリーンメッシュ版(WT360-16、ソノコム株式会社)を使用し、スキージ速度10mm/sec、クリアランス1.0mmにて、100mm角の塗膜を作製した。作製した塗膜をオーブンにて120℃、1時間乾燥し製膜した。製膜後の膜厚はマイクロメータを使用し、ガラス板の厚さをゼロに合わせた後、5点測定した平均値とした。製膜後の膜厚T0(mm)、製膜前のガラス板の質量W0(g)、製膜後のガラス板の質量W1(g)から式(1)より膜の密度を計算した。
密度(g/cm3)={(W1-W0)/(100×100×T0×10-3)}
Claims (17)
- 比重6.0以上の絶縁性フィラーと、極性基を有する樹脂と、を含有する樹脂組成物であって、前記比重6.0以上の絶縁性フィラーの含有率が、前記樹脂組成物の全固形分に対して50体積%以上である、樹脂組成物。
- 前記極性基を有する樹脂が、重量平均分子量10,000以上の樹脂を含む、請求項1に記載の樹脂組成物。
- 前記極性基が、窒素原子、酸素原子、及び硫黄原子からなる群より選択される少なくとも1つのヘテロ原子を含む、請求項1又は請求項2に記載の樹脂組成物。
- 前記極性基を有する樹脂が、ポリアミドイミド樹脂、エポキシ樹脂、アクリル樹脂、ポリエステル樹脂、及びポリエーテル樹脂からなる群より選択される少なくとも1つを含む、請求項1~請求項3のいずれか1項に記載の樹脂組成物。
- 前記比重6.0以上の絶縁性フィラーの体積平均粒子径が5.0μm以下である、請求項1~請求項4のいずれか1項に記載の樹脂組成物。
- 前記比重6.0以上の絶縁性フィラーが酸化ビスマス、酸化セリウム、チタン酸バリウム、及び酸化タングステンからなる群より選択される少なくとも1つを含む、請求項1~請求項5のいずれか1項に記載の樹脂組成物。
- さらにカップリング剤を含有する、請求項1~請求項6のいずれか1項に記載の樹脂組成物。
- 前記カップリング剤がシランカップリング剤を含む、請求項7に記載の樹脂組成物。
- さらに溶剤を含有する、請求項1~請求項8のいずれか1項に記載の樹脂組成物。
- 請求項1~請求項9のいずれか1項に記載の樹脂組成物を乾燥させてなる膜。
- 最大高さRzが10.0μm以下である、請求項10に記載の膜。
- 算術平均粗さRaが1.5μm以下である、請求項10又は請求項11に記載の膜。
- 超音波反射材として用いられる、請求項10~請求項12のいずれか1項に記載の膜。
- 請求項1~請求項9のいずれか1項に記載の樹脂組成物を硬化してなる硬化物。
- 最大高さRzが10.0μm以下である、請求項14に記載の硬化物。
- 算術平均粗さRaが1.5μm以下である、請求項14又は請求項15に記載の硬化物。
- 超音波反射材として用いられる、請求項14~請求項16のいずれか1項に記載の硬化物。
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