Crystalline radical polymerizable composition for in-vehicle reactor coil, in-vehicle reactor coil sealing body using the composition, and method for manufacturing the sealing body

Abstract

To provide a crystalline radical polymerizable composition for on-vehicle reactor coil which is improved in flowability and insulation property and improves handleability.SOLUTION: A crystalline radical polymerizable composition for on-vehicle reactor coil contains at least a crystalline radical polymerizable compound, an inorganic filler, a silane coupling agent and a radical polymerization initiator. In a preferable embodiment of the crystalline radical polymerizable composition for on-vehicle reactor coil, the crystalline radical polymerizable compound contains one or more selected from among unsaturated polyester, epoxy (meth)acrylate, urethane (meth)acrylate, polyester (meth)acrylate, polyether (meth)acrylate, radical polymerizable monomer and radical polymerizable polymer.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a crystalline radically polymerizable composition for an in-vehicle reactor coil, a granular material comprising the composition, an in-vehicle reactor coil encapsulant encapsulated with the composition, and a method for manufacturing an in-vehicle reactor coil encapsulant.

Background Art

[0002] An in-vehicle reactor coil mounted on an automobile generally houses a component in which a coil is formed around an annularly assembled magnetic core in a housing, and a resin composition is encapsulated, molded, or fixed between the magnetic core, the coil, and the bottom surface of the case inside the housing. As the resin composition, a thermosetting resin composition having high electrical insulation and heat resistance is often used.

[0003] Recently, as an insulating treatment material for in-vehicle reactor coils, a liquid epoxy resin and an epoxy resin composition (hereinafter sometimes abbreviated as EMC) excellent in electrical insulation, mechanical strength, fluidity, and dimensional stability, an in-vehicle reactor coil encapsulated with the resin and the resin composition, and a manufacturing method of the device are known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In-vehicle reactor coil encapsulants, molded articles, or fixed bodies using liquid epoxy resins and EMCs are manufactured by relatively unproductive methods such as casting. Further, in-vehicle reactor coil molded articles require post-curing after molding in order to obtain the required molded article characteristics. Therefore, a highly productive manufacturing method is expected.

[0006] Therefore, an object of the present invention is to provide a crystalline radically polymerizable composition for an in-vehicle reactor coil that is excellent in fluidity, insulation, and handleability.

Means for Solving the Problems

[0007] As a result of repeatedly examining a composition containing at least a crystalline radically polymerizable compound from various viewpoints, the present inventors have found the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention.

[0008] That is, the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention is a crystalline radically polymerizable composition for an in-vehicle reactor coil containing at least a crystalline radically polymerizable compound having a glass transition point and a melting point, an inorganic filler, a silane coupling agent, and a radical polymerization initiator, wherein the For on-vehicle reactor coil crystalline radically polymerizable composition is characterized in that it is solid at 23°C. wherein the glass transition point is in the range of 105 to 250 °C, the melting point is in the range of 30 to 150 °C, the melt viscosity of the crystalline radical polymerizable compound is in the range of 0.5 to 2400 Pa·s, the content of the inorganic filler is 50 to 95% by weight based on the total amount of the crystalline radical polymerizable composition, and when measured by a measurement method conforming to JIS K6911, the dielectric breakdown strength of the sealed body sealed with the crystalline radical polymerizable composition for on-vehicle reactor coil is 10 to 17 kV / mm It is characterized by this.

[0009] Further, in a preferred embodiment of the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention, the crystalline radically polymerizable compound contains at least one selected from crystalline unsaturated polyesters, crystalline epoxy (meth) acrylates, crystalline urethane (meth) acrylates, crystalline polyester (meth) acrylates, crystalline polyether (meth) acrylates, crystalline radically polymerizable monomers, and crystalline radically polymerizable polymers.

[0011] Further, in a preferred embodiment of the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention, the melt viscosity of the crystalline radically polymerizable composition measured by a high-temperature type flow tester is 7 to 1000 Pa·s at a measurement temperature of 90°C, a die diameter of 0.5 mm, a length of 1.0 mm, and a pressure of 30 kgf / cm2, or 1 to 7 Pa·s at a pressure of 1 kgf / cm2.

[0013] In a preferred embodiment of the crystalline radically polymerizable composition for in-vehicle reactor coils of the present invention, the ratio of the crystalline radically polymerizable compound to the total amount of the radically polymerizable compounds is 30 parts by weight or more.

[0014] In a preferred embodiment of the crystalline radically polymerizable composition for in-vehicle reactor coils of the present invention, the weight average molecular weight of the crystalline radically polymerizable compound is 100 to 100,000.

[0015] The in-vehicle reactor coil body of the present invention is characterized by being sealed with the crystalline radically polymerizable composition for sealing in-vehicle reactor coils of the present invention.

[0016] The granular material of the present invention is characterized by being composed of the crystalline radically polymerizable composition for in-vehicle reactor coils of the present invention.

[0017] The method for manufacturing the in-vehicle reactor coil sealing body of the present invention includes a step of sealing the in-vehicle reactor coil by an insert molding method using an injection molding method or a transfer molding method with the granular material composed of the crystalline radically polymerizable composition for in-vehicle reactor coils of the present invention.

Advantages of the Invention

[0018] According to the crystalline radically polymerizable composition for in-vehicle reactor coils of the present invention, it has an excellent effect of being easy to handle. Further, according to the method for manufacturing the in-vehicle reactor coil sealing, molding, or fixing body of the present invention, since it becomes a crystalline radically polymerizable composition having an extremely low viscosity during heat melting at the time of injection molding or transfer molding, it has an advantageous effect that the fluidity required for sealing, molding, or fixing the in-vehicle reactor coil can be ensured.

[0019] Also, according to the present invention, an in-vehicle reactor coil sealing, molding, or fixing body sealed, molded, or fixed with the crystalline radically polymerizable composition for in-vehicle reactor coils can be provided.

[0020] Furthermore, the present invention can provide a method for manufacturing an in-vehicle reactor coil sealing, molding, or fixing body, which includes a step of sealing, molding, or fixing an in-vehicle reactor coil by an insert molding method using a granular material, powder, or tablet made of a crystalline radical polymerizable composition for an in-vehicle reactor coil.

Mode for Carrying Out the Invention

[0021] The crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention is characterized by containing at least a crystalline radical polymerizable compound, an inorganic filler, a silane coupling agent, and a radical polymerization initiator. This is because, by using the crystalline radical polymerizable composition, as shown in the examples described later, a polymerizable composition excellent in fluidity and handleability can be realized. In this specification, the crystalline radical polymerizable composition for an in-vehicle reactor coil may sometimes be referred to as a crystalline radical polymerizable composition.

[0022] Also, in a preferred embodiment of the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, the crystalline radical polymerizable compound is characterized by containing one or more selected from unsaturated polyesters, epoxy (meth) acrylates, urethane (meth) acrylates, polyester (meth) acrylates, polyether (meth) acrylates, radical polymerizable monomers, and radical polymerizable multimers.

[0023] Although the crystallinity is omitted, specifically, the crystalline radical polymerizable compound can contain one or more selected from crystalline unsaturated polyesters, crystalline epoxy (meth) acrylates, crystalline urethane (meth) acrylates, crystalline polyester (meth) acrylates, crystalline polyether (meth) acrylates, crystalline radical polymerizable monomers, and crystalline radical polymerizable multimers. When these polymerizable compounds are used, the mechanical properties and handleability are good (hereinafter, the crystallinity may sometimes be omitted).

[0024] In the present specification, the crystalline compound can be a compound having a glass transition point and a melting point. These temperatures can be confirmed by a thermal analysis apparatus such as a DSC (Differential Scanning Calorimeter) or a TGDTA (Thermogravimetry-Differential Thermal Analysis Simultaneous Measurement Apparatus). The crystalline compound in the present invention can be a compound whose melting point can be confirmed by a thermal analysis apparatus.

[0025] Further, in a preferred embodiment of the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, from the viewpoints of workability and moldability, the melting point of the crystalline radical polymerizable compound is 30 to 150°C, more preferably 30 to 120°C, and even more preferably 30 to 100°C. When a crystalline radical polymerizable compound having a melting point lower than 30°C or a crystalline radical polymerizable compound having a melting point higher than 150°C is used, compared thereto, when a crystalline radical polymerizable compound having a melting point in the range of 30 to 150°C is used, better handleability can be realized. This is because when the melting point of the crystalline radical polymerizable compound is lower than the above range, it tends to become liquid at normal temperature, and thus there is a risk that the crystalline radical polymerizable composition will have difficulty maintaining a solid state. When the melting point of the crystalline radical polymerizable compound is higher than the above range, since it is close to the molding temperature of the mold, the time from the start of flow to curing becomes short, and there is a risk of molding defects.

[0026] Further, when only a crystalline radical polymerizable compound having a melting point lower than 30°C is used, there is a tendency that it is difficult to form a solid crystalline radical polymerizable composition at 23°C. On the other hand, when only a crystalline radical polymerizable compound having a melting point higher than 150°C is used, in the injection molding method, when plasticizing the crystalline radical polymerizable composition in the cylinder, since the cylinder temperature and the mold temperature are close to each other, there is a tendency that the stability in the cylinder is poor.

[0027] Further, in a preferred embodiment of the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, from the viewpoint of the handleability of the crystalline radical polymerizable compound, the crystalline radical polymerizable composition is characterized by being solid at 23°C. The reason for setting the above range is that the shape of the crystalline radical polymerizable composition does not change under the manufacturing, molding, and transportation environments of the crystalline radical polymerizable composition, enabling continuous production under general-purpose manufacturing facilities and conditions. Here, the solid can be defined as a substance whose shape and volume do not easily change by an external force.

[0028] Further, in a preferred embodiment of the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, from the viewpoint of fluidity, the melt viscosity of the crystalline radical polymerizable composition measured by a high-temperature type flow tester is 7 to 1000 Pa·s at a measurement temperature of 90°C, a die diameter of 0.5 mm, a length of 1.0 mm, and a pressure of 30 kgf / cm2, or 1 to 7 Pa·s at a pressure of 1 kgf / cm2, and more preferably in the range of 1 to 100 Pa·s. When the melt viscosity of the crystalline radical polymerizable composition is lower than the above range, many thin burrs are generated and the burrs are difficult to peel off from the mold. Further, since the composition enters the gap of the mold, continuous molding becomes difficult. When the melt viscosity is higher than the above range, the filling property during molding is poor and there is a risk that a product cannot be obtained.

[0029] Further, in a preferred embodiment of the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, from the viewpoint of product quality, the inorganic filler is 50 to 95% by weight, more preferably 55 to 93% by weight, and even more preferably 60 to 90% by weight based on the total amount of the crystalline radical polymerizable composition. The reason for setting the above range is that when the amount of the inorganic filler is less than the above range, the shrinkage rate is large and the molded product is deformed. When it is more than the above range, the melt viscosity during molding is high and a load is applied to the insert, and there is a risk that the insert is damaged.

[0030] Further, in a preferred embodiment of the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention, from the viewpoint of maintaining a solid, the ratio of the crystalline radically polymerizable compound to the total amount of the radically polymerizable compounds is 30 parts by weight or more, more preferably 40 parts by weight or more, and still more preferably 50 parts by weight or more. The above range is set because when the ratio of the crystalline radically polymerizable compound is less than the above range, there is a risk that it will be difficult to become a solid.

[0031] Further, in a preferred embodiment of the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention, from the viewpoint of quality control of the crystalline radically polymerizable composition, the weight average molecular weight of the crystalline radically polymerizable compound is 100 to 100,000, more preferably 100 to 50,000, and still more preferably 150 to 30,000. The above range is set because when the weight average molecular weight of the crystalline radically polymerizable compound is smaller than the above range, the crystalline radically polymerizable composition is difficult to become a solid, and when it is larger than the above range, the molecular weight of the crystalline radically polymerizable composition cannot be controlled with high precision, so there is a risk that the compound characteristics and composition characteristics will vary.

[0032] Further, the in-vehicle reactor coil sealing body, molded body, or fixed body of the present invention is characterized in that it is sealed, molded, or fixed with the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention.

[0033] Further, the granular material of the present invention is characterized by comprising the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention. Although it is a granular material, the present invention may also be in the form of powder, tablets, etc. in addition to the granular material. That is, in the case of other than the granular material, the powder, tablets, etc. of the present invention can be composed of the crystalline radically polymerizable composition for an in-vehicle reactor coil of the present invention.

[0034] In addition, the method for manufacturing an in-vehicle reactor coil sealing body, molded body, or fixing body of the present invention is characterized by having a step of sealing, molding, or fixing an in-vehicle reactor coil by an insert molding method using an injection molding method or a transfer molding method for the granular material composed of the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention.

[0035] An in-vehicle reactor coil sealing body, molded body, or fixing body is a circuit component that controls voltage increase and decrease in a power conversion device. Generally, a component composed of a magnetic core and a coil is set in a case, and a resin composition is filled therein to manufacture a reactor coil sealing body or the like. Since a voltage is applied during the operation of an in-vehicle reactor coil sealing body or the like, electrical insulation is required. In addition, since the gaps inside the coil winding and in the case are narrow, the resin composition used for sealing is required to have good fluidity. If the fluidity of the resin composition is poor, the resin composition may not be sufficiently filled into the coil winding, resulting in voids during molding and a risk of short circuit. The composition of the present invention can be applied to an in-vehicle reactor coil sealing body, molded body, or fixing body that requires electrical insulation and high fluidity.

[0036] A composition with a low melt viscosity and good fluidity has a soft composition even at room temperature, which may cause problems in handleability. In addition, the soft composition may form lumps, causing the composition to fuse in the hopper in the injection molding method, the pre-molded tablets to fuse in the transfer molding method, and further, there may be a problem that the shape changes and the tablets cannot enter the tablet insertion holes in the transfer molding machine. The present invention has an excellent effect of high productivity by achieving both fluidity and handleability.

[0037] <Method for manufacturing unsaturated polyester> The unsaturated polyester used in the present invention, in one example, for example, an unsaturated polybasic acid, a saturated polybasic acid, and glycols are reacted by a known dehydration condensation reaction It can usually have an acid value of 2 to 40 mg-KOH / g. In the production of unsaturated polyesters, by appropriately selecting the selection and combination of acid components of unsaturated polybasic acids and saturated polybasic acids, the selection and combination of glycols, and their blending ratios, etc., an unsaturated polyester having crystallinity can be obtained.

[0038] Examples of unsaturated polybasic acids include maleic acid, maleic anhydride, fumaric acid, citraconic acid, mesaconic acid, itaconic acid, tetrahydrophthalic acid, glutaconic acid, etc.

[0039] Examples of saturated polybasic acids include phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, het acid, tetrabromophthalic anhydride, etc.

[0040] Examples of glycols include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, hydrogenated bisphenol A, bisphenol A propylene oxide compound, cyclohexanedimethanol, dibromoneopentyl glycol, etc.

[0041] In the present invention, among crystalline unsaturated polyesters, fumaric acid is used as the unsaturated polybasic acid, isophthalic acid or terephthalic acid is used as the saturated polybasic acid, and an unsaturated polyester using ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, cyclohexanedimethanol as the main components of glycol is preferable.

[0042] <Method for Producing Epoxy (Meth) Acrylate> The epoxy (meth)acrylate used in the present invention can be produced by a method known per se. By appropriately selecting an epoxy resin and an unsaturated monobasic acid in the presence or absence of a known inhibitor and a known esterification catalyst, in an inert gas stream or in an air atmosphere, a crystalline epoxy (meth)acrylate can be obtained. If necessary, other radically polymerizable monomers or organic solvents can be added and reacted for the purpose of reducing the melt viscosity of the reaction system.

[0043] The epoxy (meth)acrylate in the present invention can be, for example, an epoxy (meth)acrylate having a double bond of acrylate or methacrylate at the molecular end obtained by an addition reaction of acrylic acid or methacrylic acid to an epoxy resin having two or more glycidyl ether groups in one molecule. It may also be an epoxy (meth)acrylate resin in which the epoxy (meth)acrylate is dissolved in a radically polymerizable monomer and / or a radically polymerizable polymer. Examples of the epoxy resin having two or more glycidyl ether groups in one molecule include bisphenol A, bisphenol F, bisphenol S, etc., or bisphenol-type epoxy resins from these derivatives, vixylenol-type epoxy resins from vixylenol and its derivatives, biphenol-type epoxy resins from biphenol and its derivatives, naphthalene-type epoxy resins from naphthalene and its derivatives, and further novolak-type epoxy resins. These can be used alone or in admixture of two or more. The epoxy equivalent, which serves as a measure of the molecular weight of the epoxy resin, is preferably in the range of 174 to 2000 eq / g.

[0044] <Method for producing urethane (meth)acrylate> In addition, the urethane (meth)acrylate in the present invention, as an example, for example, isocyanate at the molecular terminal obtained by reacting a polyalcohol and / or a polyester polyol and / or a polyether polyol having two or more hydroxyl groups in one molecule with a diisocyanate, and / or reacting a compound having one or more alcoholic hydroxyl groups and one or more acrylate groups or methacrylate groups with an isocyanate in one molecule, or first reacting a compound having one or more alcoholic hydroxyl groups and one or more acrylate groups or methacrylate groups with a diisocyanate so that an isocyanate group remains, and then reacting the remaining isocyanate group with a polyalcohol and / or a polyester polyol and / or a polyether polyol having two or more hydroxyl groups in one molecule to obtain a urethane acrylate having a double bond of acrylate or methacrylate at the molecular terminal. In the production of urethane (meth)acrylate, by appropriately selecting a combination of isocyanate, polyalcohol and / or polyester polyol and / or polyether polyol, and a compound having one or more alcoholic hydroxyl groups and one or more acrylate groups or methacrylate groups, a crystalline urethane (meth)epoxy acrylate can be obtained. The urethane acrylate or urethane methacrylate may be a urethane (meth)acrylate resin dissolved in a radically polymerizable monomer such as styrene and diethylene glycol dimethacrylate and / or a radically polymerizable polymer. These can be used alone or as a mixture of two or more kinds.

[0045] Examples of the compound having one or more alcoholic hydroxyl groups and one or more acrylate groups or methacrylate groups include hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, phenoxyhydroxypropyl (meth)acrylate, trimethylolpropane di(meth)acrylate, dipropylene glycol mono(meth)acrylate, and the like.

[0046] In addition, examples of the polyalcohol having two or more hydroxyl groups in one molecule include neopentyl glycol, ethylene glycol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, propylene glycol, diethylene glycol, dipropylene glycol, trimethylene glycol, hydrogenated bisphenol A, bisphenol A ethylene oxide adduct, bisphenol A propylene oxide adduct, etc. Examples of the polyester polyol having two or more hydroxyl groups in one molecule include saturated polyester polyols having a molecular weight of 1000 to 2000 obtained from a dehydration condensation reaction of a polyalcohol such as neopentyl glycol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, trimethylene glycol, hydrogenated bisphenol A, bisphenol A ethylene oxide adduct, bisphenol A propylene oxide adduct, etc. and a polybasic acid such as adipic acid, (anhydrous) phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, etc. Examples of the polyether polyol having two or more hydroxyl groups in one molecule include polyethylene glycol, polypropylene glycols having a molecular weight of 300 to 2000 obtained by a ring-opening reaction of ethylene oxide or propylene oxide, or polycaprolactone obtained by a ring-opening reaction of caprolactone, etc., which can be used alone or in combination of two or more kinds.

[0047] As the compound having two or more isocyanate groups in one molecule, aromatic and / or aliphatic polyisocyanate compounds are used. For example, tolylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, trifunctional isocyanate having an isocyanurate ring formed by trimerization of a bifunctional isocyanate compound, isocyanate prepolymer modified with a commercially available polyol, and the like can be mentioned. These can be used alone or in admixture of two or more.

[0048] <Method for Producing Polyester (Meth)acrylate> In addition, the polyester (meth)acrylate in the present invention can be, for example, a polyester acrylate having a double bond of acrylate or methacrylate at the molecular end obtained by esterification of a polyester polyol and acrylic acid or methacrylic acid, or by reaction of an acid-terminated polyester with an acrylate or methacrylate having a glycidyl group, or a polyester methacrylate. In the production of the polyester (meth)acrylate, a crystalline polyester (meth)acrylate can be obtained by appropriately selecting a polyester polyol and acrylic acid or methacrylic acid, or an acid-terminated polyester and an acrylate or methacrylate having a glycidyl group. A polyester acrylate resin or a polyester methacrylate resin in which a polyester acrylate or a polyester methacrylate is dissolved in a radically polymerizable monomer and / or a radically polymerizable polymer such as styrene or diethylene glycol dimethacrylate may also be used. These can be used alone or as a mixture of two or more.

[0049] <Method for Producing Polyether (Meth)acrylate> In addition, the polyether (meth)acrylate in the present invention can be, for example, a polyether acrylate having a double bond of acrylate or methacrylate at the molecular end obtained by, for example, esterification of a polyether polyol with acrylic acid or methacrylic acid, or reaction of an acid-terminated polyether with an acrylate or methacrylate having a glycidyl group, or a polyether methacrylate. In the production of the polyether (meth)acrylate, a crystalline polyester (meth)acrylate can be obtained by appropriately selecting a polyether polyol, acrylic acid or methacrylic acid, or an acid-terminated polyester and an acrylate or methacrylate having a glycidyl group. A polyether acrylate resin or a polyether methacrylate resin in which the polyether acrylate or the polyether methacrylate is dissolved in a radically polymerizable monomer and / or a radically polymerizable polymer such as styrene or diethylene glycol dimethacrylate may also be used. These can be used alone or as a mixture of two or more.

[0050] Also, in a preferred embodiment, the crystalline radically polymerizable monomer that is solid at 30 to 150°C in the present invention includes one or more selected from triacrylate of ethoxylated isocyanuric acid (melting point about 50°C), polyethylene glycol di(meth)acrylate (melting point 35 to 53°C), methoxypolyethylene glycol (meth)acrylate (melting point 33 to 40°C), behenyl acrylate (melting point 46°C), tetramethylpiperidinyl methacrylate (melting point 56 to 60°C), trimethylallyl isocyanurate (melting point 83 to 87°C), diacetone acrylamide (melting point about 56°C), dimethyl itaconate (melting point 36°C), vinyl stearate (melting point 36°C), N-vinylcarbazole (melting point 67°C), N-methylol acrylamide (melting point 71 to 75°C), acrylamide (melting point 84°C), tolylene diallyl carbamate (melting point 85 to 110°C), maleimide (melting point 93°C), acenaphthylene (melting point 95°C), etc. Using these crystalline radically polymerizable compounds improves the handleability.

[0051] In the radical polymerizable monomer of the present invention, a liquid radical polymerizable monomer at normal temperature can be used as long as the object of the present invention is not impaired. For example, vinyl aromatic compounds having a vinyl group such as styrene monomer, α-methylstyrene, vinyltoluene, α-chlorostyrene; vinyl esters such as vinyl acetate, vinyl propionate, vinyl lactate, vinyl butyrate, Veova monomer (manufactured by Shell Chemical); (meth)acrylic acid esters such as methyl acrylate, ethyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, and the like can be mentioned.

[0052] In addition, bifunctional or higher functional radical polymerizable monomers such as triallyl cyanurate, diethylene glycol dimethacrylate, diallyl tetrabromophthalate, phenoxyethyl acrylate, 2-hydroxyethyl acrylate, 1,6-hexanediol diacrylate, diallyl phthalate having an allyl group, triallyl isocyanurate can be used. These radical polymerizable monomers may be used alone or in combination of two or more.

[0053] In the radical polymerizable polymer of the present invention, diallyl phthalate prepolymer, TAIK prepolymer, epoxy prepolymer, urethane prepolymer, acrylate prepolymer can be used. These radical polymerizable polymers may be used alone or in combination of two or more.

[0054] In the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, an inorganic filler can be blended. Examples of the inorganic filler include calcium carbonate, magnesium carbonate, barium carbonate, calcium hydroxide, aluminum hydroxide, magnesium hydroxide, magnesium oxide, alumina, silica, zinc oxide, mica, aluminum nitride, boron nitride. Among these, silica is preferable from the viewpoint of fluidity. These may be used alone or in combination of two or more.

[0055] As the inorganic filler, those having an average particle diameter of 100 μm or less, preferably 0.01 to 50 μm can be used. By using the inorganic filler having the above average particle diameter, a crystalline radical polymerizable composition for an in-vehicle reactor coil excellent in fluidity and strength during molding can be obtained.

[0056] In the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, various additives that adhere to the inorganic filler and the reinforcing material, for example, (meth)acrylate compounds having a polar group and coupling agents can be blended.

[0057] The (meth)acrylate compound having a polar group is not particularly limited, and examples thereof include (meth)acrylate compounds in which a substituent containing an atom other than carbon and hydrogen is ester-bonded. Examples of the substituent include a hydroxyl group, an epoxy group, a glycidyl ether group, a tetrahydrofurfuryl group, an isocyanate group, a carboxyl group, an alkoxysilyl group, a phosphate ester group, a lactone group, an oxetane group, a tetrahydropyranyl group, an amino group, and the like. The coupling agent is not particularly limited, and for example, a silane coupling agent or a titanate coupling agent can be used. As the silane coupling agent, for example, an epoxy silane-based, an amino silane-based, a cationic silane-based, a vinyl silane-based, an acrylic silane-based, a mercapto silane-based, and a composite system thereof can be used.

[0058] Among these, an acrylic silane-based coupling agent is preferable from the viewpoint of improving strength. In addition, any additive can be used as long as the object of the present invention is not impaired.

[0059] In the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, as the radical polymerization initiator, an unsaturated polyester resin composition, a heat-decomposable organic peroxide or a polymerization inhibitor used in a radical polymerizable composition can usually be used.

[0060] Examples of the organic peroxide include t-butylperoxy-2-ethylhexyl monocarbonate, 1,1-di(t-hexylperoxy)cyclohexane, 1,1-di(t-butylperoxy)-3,3,5-trimethylcyclohexane, t-butylperoxyoctoate, benzoyl peroxide, methyl ethyl ketone peroxide, acetylacetone peroxide, t-butylperoxybenzoate, dicumyl peroxide and the like. These may be used alone or in combination of two or more.

[0061] Among these, from the viewpoints of molding conditions and storage stability, it is preferable to use an organic peroxide having a 10-hour half-life temperature of 100°C or higher. Specifically, dicumyl peroxide can be preferably used.

[0062] Examples of the polymerization inhibitor include hydroquinone, monomethyl ether hydroquinone, toluhydroquinone, di-t-4-methylphenol, monomethyl ether hydroquinone, phenothiazine, t-butylcatechol, quinones such as p-benzoquinone and pyrogallol, phenolic compounds such as 2,6-di-t-butyl-p-cresol, 2,2-methylenebis(4-methyl-6-t-butylphenol) and 1,1,3-tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane, and piperidine-1-oxyls such as 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl, 4-oxo-2,2,6,6-tetramethylpiperidine-1-oxyl, 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl, 4-carboxy-2,2,6,6-tetramethylpiperidine-1-oxyl and 2,2,6,6-tetramethylpiperidine-1-oxyl. By using these, thickening during filling at the time of molding can be suppressed, and a radical polymerizable composition having a low melt viscosity can be obtained. These may be used alone or in combination of two or more.

[0063] In the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, a reinforcing material can be blended. By using a reinforcing material, a crystalline radical polymerizable composition for an in-vehicle reactor coil having excellent strength characteristics and dimensional stability can be obtained.

[0064] As the reinforcing material used in the present invention, glass fibers usually used in fiber-reinforced plastics such as BMC (Bulk Molding Compound) and SMC (Sheet Molding Compound) are generally used, but it is not limited to glass fibers and other materials can also be used.

[0065] Examples of the glass fiber include glass fibers such as E-glass (alkali-free glass for electricity), C-glass (alkali-containing glass for chemistry), A-glass (acid-resistant glass), and S-glass (high-strength glass) made of silicate glass and borosilicate glass. These can be used in the form of long fibers (roving), short fibers (chopped strand), and milled fiber. Furthermore, these glass fibers with surface treatment can also be used.

[0066] In the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, other inorganic fillers can be appropriately blended within a range that does not inhibit the fluidity of the composition and the characteristics when used as a sealing material or the like.

[0067] Examples of these include oxides and their hydrates, inorganic foamed particles, and hollow particles such as silica balloons.

[0068] In the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, a release agent can be used. As the release agent, waxes such as fatty acid-based, fatty acid metal salt-based, and mineral-based waxes generally used for thermosetting resins can be used. In particular, fatty acid-based, fatty acid metal salt-based, and waxes with excellent heat discoloration resistance can be preferably used.

[0069] Specific examples of these mold release agents include stearic acid, zinc stearate, aluminum stearate, calcium stearate, paraffin wax, etc. These mold release agents may be used alone or in combination of two or more.

[0070] As the mold release agent, an external mold release agent such as a type of mold release agent that is sprayed or applied to the mold as needed, or a molding material containing a mold release agent can also be used.

[0071] In the present invention, in addition to these compounding components, a curing catalyst, a polymerization inhibitor, a colorant, a thickener, a wetting dispersant, a surface conditioner, a viscosity reducer, a flow modifier, other organic additives, inorganic additives, etc. for adjusting the curing conditions of the crystalline radical polymerizable composition can be appropriately compounded as needed.

[0072] <Manufacturing method of crystalline radical polymerizable composition> The crystalline radical polymerizable composition for in-vehicle reactor coils of the present invention can be manufactured by blending each component, mixing them thoroughly and uniformly using a mixer, blender, etc., and then preparing and granulating them using a kneader, extruder, etc. capable of heating and pressurizing.

[0073] Further, the granular material, powder, and tablet of the present invention are characterized by being composed of the crystalline radical polymerizable composition for in-vehicle reactor coils of the present invention. The granular material composed of the crystalline radical polymerizable composition for in-vehicle reactor coils of the present invention may be in the form of pellets.

[0074] Further, the in-vehicle reactor coil sealing body, molded body, or fixed body of the present invention is characterized by molding and sealing, molding, or fixing the granular material, powder, and tablet composed of the crystalline radical polymerizable composition for in-vehicle reactor coils of the present invention. The in-vehicle reactor coil sealing body, molded body, or fixed body can be molded by various molding methods of thermosetting compositions according to conventional methods.

[0075] In addition, since the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention is dry and has good thermal stability during melting, as a molding method, melt heating molding methods such as injection molding, injection compression molding, transfer molding, and compression molding can be preferably used.

[0076] Among these, the injection molding method using an injection molding machine and the transfer molding method using a transfer molding machine are particularly suitable. The injection molding method can shorten the molding time, and the transfer molding method can mold many molded articles at once and manufacture in-vehicle reactor coil encapsulants, molded articles, or fixing members with complex shapes.

[0077] <In-vehicle Reactor Coil Encapsulant, Molded Article, or Fixing Member and Method for Manufacturing In-vehicle Reactor Coil Encapsulant, Molded Article, or Fixing Member> The in-vehicle reactor coil encapsulant, molded article, or fixing member of the present invention can be manufactured by encapsulating, molding, or fixing an electric and electronic component by an insert molding method using the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention. Here, for the crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention, all components constituting the crystalline radical polymerizable composition may be separately pre-heated and kneaded, or a part or all of the constituent components may be mixed and heated and kneaded immediately before injection into the mold.

[0078] The temperature and pressure of the crystalline radical polymerizable composition during mold injection are not particularly limited. However, when using an injection molding machine, the temperature of the crystalline radical polymerizable composition is 60 to 130°C, the mold temperature is 130 to 190°C, and the pressure of the crystalline radical polymerizable composition is 0.1 to 10 MPa. In the case of a transfer molding machine, when the mold temperature is 130 to 190°C and the pressure of the crystalline radical polymerizable composition is 0.1 to 10 MPa, damage to the electric and electronic component is reduced, which is preferable.

Examples

[0079] Hereinafter, an embodiment of the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples at all.

[0080] <Production Example of Radical Polymerizable Composition for Vehicle Reactor Coil> Examples 1 to 12 and Comparative Examples 1 to 2 The crystalline or amorphous radically polymerizable compositions of Examples 1 to 12 shown in Table 2 and Comparative Examples 1 and 2 shown in Table 3 were mixed in the amounts shown in Tables 2 and 3 below and homogeneously mixed using a kneader capable of pressurizing, heating and cooling, and then the mixture was fed into an extruder and hot-cut into granules. Some of the granular and bulk radically polymerizable compositions were powdered using a pulverizer.

[0081] The obtained radical polymerizable composition was subjected to a hydraulic molding machine (manufactured by Toho Press Manufacturing Co., Ltd.) at a mold temperature of 165°C for a curing time of 180 seconds or until a test piece could be obtained, to prepare a test piece. The physical properties of the molded test piece were evaluated by the methods described below, and are shown in Tables 2 and 3.

[0082] The following components were used as the blending ingredients: (1) Polymerizable compound 1. Crystalline radically polymerizable compound 1: Phthalic acid-based unsaturated polyester (condensation product of terephthalic acid, fumaric acid, and 1,6-hexanediol) 2. Crystalline radically polymerizable compound 2: Urethane methacrylate (1,6-hexamethylene diisocyanate to 2-hydroxyethyl methacrylate adduct) 3. Crystalline radical polymerizable compound 3: Urethane acrylate (1,6-hexamethylene diisocyanate to 2-hydroxyethyl acrylate adduct) 4. Crystalline radically polymerizable monomer 1: Ethoxylated isocyanuric acid triacrylate (A-9300, manufactured by Shin-Nakamura Chemical Co., Ltd.) 5. Amorphous radical polymerizable compound 1: Phthalic acid-based unsaturated polyester (U-PICA 8552H, manufactured by Japan U-PICA Co., Ltd.) 6. Amorphous radical polymerizable compound 2: Bisphenol A type epoxy methacrylate (methacrylic acid adduct of bisphenol A type epoxy resin) 7. Radical polymerizable monomer 1: Diallyl phthalate monomer (Daisodap monomer manufactured by Osaka Soda Co., Ltd.) 8. Radical polymerizable monomer 2: Diethylene glycol dimethacrylate (2G manufactured by Shin-Nakamura Chemical Co., Ltd.)

[0083] (2) Inorganic filler 1. Inorganic filler 1: Fused silica (average particle diameter 24 μm, manufactured by Denka Co., Ltd.) 2. Inorganic filler 2: Calcium carbonate (average particle diameter 2 μm, manufactured by Nitto Funka Co., Ltd.)

[0084] (3) Additive 1. Silane coupling agent: Methacrylic silane (KBM-503 manufactured by Shin-Etsu Chemical Co., Ltd.) 2. Radical polymerization initiator: Dicumyl peroxide (Perkyl D manufactured by NOF Corporation) 3. Release agent: Zinc stearate (GF-200 manufactured by NOF Corporation) 4. Polymerization inhibitor: p-Benzoquinone (PBQ manufactured by Seiko Chemical Co., Ltd.) 5. Colorant: Carbon black (CB40 manufactured by Mitsubishi Chemical Corporation)

[0085] <Properties of polymerizable compounds> The melting points and weight-average molecular weights of the crystalline or amorphous radical polymerizable compounds and radical polymerizable monomers were measured and shown in Table 1.

[0086]

Table 1

[0087]

Table 2

[0088]

Table 3

[0089] <Compound properties, composition properties, physical property evaluation methods>

[0090] (1) Melting point The radical polymerizable compounds shown in Table 1 were measured with a differential scanning calorimeter "DSC6220" (manufactured by Seiko Instruments Inc.). 10 mg of the measurement sample was placed in an aluminum pan, covered with a lid and sealed, and measured from -60°C to 200°C at a heating rate of 10°C / min. The endothermic peak of the obtained curve was taken as the melting point. The results are shown in Table 1. The measurement of the compound that was liquid at 23°C was aborted.

[0091] (2) Weight-average molecular weight The weight-average molecular weight of the radical polymerizable compounds shown in Table 1 was measured in terms of polystyrene using GPC (gel permeation chromatography) after dissolving the polymerizable compound in tetrahydrofuran (THF) at 1.0 wt%. The measurement conditions are shown below. The results are shown in Table 1. However, even if the strict criteria are not met, depending on the desired application, required quality, etc., the weight-average molecular weight may be less than 100 or greater than 100,000 and still be compliant, so it may be considered as a single guideline. Equipment: Shodex GPC-101 manufactured by Showa Denko K.K. Columns: KF-802, 803, 804, 805 manufactured by Showa Denko K.K. Solvent, carrier liquid: THF Flow rate: 1.0 ml / min Sample concentration: 1.0% Temperature: 40°C Sample injection volume: 200 μl Detector: Differential refractive index detector

[0092] (3) Hardness The measurement method referred to JIS K 7215. The hardness of the crystalline or amorphous radical polymerizable compositions of Examples 1 to 12 shown in Table 2 and Comparative Examples 1 to 2 shown in Table 3 was measured using a durometer (WR-105D, manufactured by Seito Tokyo Precision Co., Ltd.). The radical polymerizable composition adjusted to 90°C was formed into a flat plate shape of about 100 mm × 100 mm × 10 mm and cooled and solidified in a constant temperature room at 23°C. The radical polymerizable composition before curing adjusted to 23°C was placed on a horizontal hard table. While keeping the pressure reference surface of the durometer parallel to the surface of the radical polymerizable composition, it was pressed against the surface of the radical polymerizable composition as quickly as possible without impact to make the pressure reference surface and the radical polymerizable composition closely adhere. The maximum indication value of the pointer of the indicating device was quickly read within 1 second. The results are shown in Tables 2 and 3. The target hardness was set to 10, excellent for 20 or more, good for 10 or more, and acceptable for less than 10.

[0093] (4) Melt Viscosity The melt viscosity of the crystalline or amorphous radical polymerizable compositions of Examples 1 to 12 shown in Table 2 and Comparative Examples 1 to 2 shown in Table 3 was measured using a Koka type flow tester (CFT-100EX, manufactured by Shimadzu Corporation). Equipped with a die having a diameter of 0.5 mm and a length of 1 mm, the radical polymerizable composition was put into the cylinder sample insertion hole heated to 90°C. After preliminary heating for 240 seconds, the piston was pressurized at a pressure of 30 kgf / cm2 or 1 kgf / cm2 to cause the radical polymerizable composition to flow out from the nozzle of the die, and the melt viscosity was determined from a location with good linearity. The results are shown in Tables 2 and 3. The target melt viscosity was set to 1 to 1000 Pa·s, and the composition with a melt viscosity of 1 to 100 Pa·s was considered excellent, and 100 to 1000 Pa·s was considered good.

[0094] (5) Flow Length The measurement method referred to EIMS T-901. Using the crystalline or amorphous radical polymerizable compositions shown in Examples 1 to 12 in Table 2 and Comparative Examples 1 to 2 in Table 3, the flow length was measured with an auxiliary ram type transfer molding machine equipped with a spiral flow mold. The spiral flow mold was heated to 165°C. As the spiral flow mold, one was used in which the center part was the material inlet part and a groove was provided in a semicircular spiral curve shape with a radius of 1.6 mm starting from the inlet part. A predetermined amount of the radical polymerizable composition was weighed so that the thickness of the cal was in the range of 1 to 10 mm. The plunger was raised, the radical polymerizable composition was put into the pot, and immediately a pressure of 3.2 MPa was applied to start transfer molding. When the movement of the plunger stopped, the mold was opened 180 seconds after the start of measurement and the molded product was taken out. The number obtained by adding half of the length of the low-density part beyond the shiny part at the tip of the molded product or the length of the shiny part was read. The results are shown in Tables 2 and 3. The target flow length was 50 cm, and 100 cm or more was considered excellent, 50 cm or more was considered good, and less than 50 cm was considered acceptable. However, even if the strict criteria are not met, depending on the desired application, required quality, etc., there may be cases where the conditions are met even if it is less than 50 cm, so it may be considered as a single standard for consideration.

[0095] (6) Molding shrinkage rate The measurement method complied with JIS K 6911. Using the crystalline or amorphous radical polymerizable compositions of Examples 1 to 12 shown in Table 2 and Comparative Examples 1 and 2 shown in Table 3, test pieces were produced by compression molding using a mold for measuring shrinkage rate. The radical polymerizable composition was placed in a mold adjusted to 165°C and heated under pressure for 3 minutes. The test piece was immediately taken out of the mold and stored for 24 hours under constant temperature and humidity of 23°C and 55% RH. The dimensions at four locations, two on the front surface and two on the back surface, were measured along the measurement lines perpendicular to each other of the outer shape of the protruding annular band on the front and back of the test piece. The outer shape of the groove of the mold corresponding to the test piece was measured up to 0.01 mm under the same conditions to calculate the molding shrinkage rate. The results are shown in Table 2 and Table 3. The target molding shrinkage rate was set at 0.5%, with less than 0.2% being excellent, 0.2 to 0.5% being good, and exceeding 0.5% being acceptable. However, even if the strict criteria are not met, depending on the desired application, required quality, etc., there may be cases where the conditions are met even when exceeding 0.5%, so it may be considered as a single reference.

[0096] (7) Glass transition point The measurement complied with JIS K 7224-4. The crystalline or amorphous radical polymerizable compositions of Examples 1 to 12 shown in Table 2 and Comparative Examples 1 and 2 shown in Table 3 were placed in a flat mold adjusted to 165°C. The mold was quickly closed and heated under pressure for molding. After curing, the mold was opened to obtain a flat molded piece. The flat molded piece was cut into strips to obtain a test piece for measuring the glass transition point. Dynamic viscoelasticity (RSA-G2 manufactured by TA Instruments) was measured at a heating rate of 2°C / min in the range of 30 to 250°C and a frequency of 10 Hz. The Tanδ peak temperature was taken as the glass transition point. The results are shown in Table 2 and Table 3. The target glass transition point was set at 125°C, with 125°C or higher being good and less than 125°C being acceptable. However, even if the strict criteria are not met, depending on the desired application, required quality, etc., there may be cases where the conditions are met even when less than 125°C, so it may be considered as a single reference.

[0097] (8) Dielectric breakdown strength The measurement method conformed to JIS K6911. The crystalline or amorphous radical polymerizable compositions shown in Examples 1 to 12 in Table 2 and Comparative Examples 1 to 2 in Table 3 were placed in a flat mold heated to 165°C. The mold was quickly closed and pressure-heated for molding. After curing, the mold was opened to obtain a flat molded piece. Machining was performed on the flat molded piece to obtain a test piece for measuring the dielectric breakdown strength. The dielectric breakdown strength (dielectric breakdown test device YST-243-100RHO manufactured by Yamayo Testing Machine Co., Ltd.) was measured by applying a voltage in a 20-second step method using a Φ20 sphere / Φ25 cylinder as the electrodes in silicone oil at a temperature of 23°C. The results are shown in Tables 2 and 3. The target dielectric breakdown strength was set at 10 kV / mm, with 12 kV / mm or more being considered good and less than 10 kV / mm being considered acceptable. However, even if the strict criteria are not met, depending on the required quality, etc., there may be cases where the conditions are met even if it is less than 10 kV / mm, so it may be considered as one reference.

[0098] (9) Sealing, molding, or fixability Reactor coil sealing, molding, or fixing by transfer molding was performed at a mold temperature of 170°C and an injection pressure of 3 MPa, and those with good sealing properties, moldability, or fixability and good appearance of the obtained molded products were considered good, while those with poor sealing properties, etc., and appearance were considered poor.

[0099] <Evaluation Results> As shown in Tables 2 and 3, it was found that the crystalline radical polymerizable composition for in-vehicle reactor coils in the present invention has excellent handleability. In particular, Examples 1 to 8 and 11 of the crystalline radical polymerizable composition for in-vehicle reactor coils in the present invention are solids at 23°C, so they have excellent handleability, low melt viscosity, and are good. The crystalline radical polymerizable composition for in-vehicle reactor coils in the present invention was found to show excellent overall results.

[0100] Example 9 is a crystalline radical polymerizable composition with a different blending amount of inorganic filler from that of Example 1. The hardness of the composition was 3 and it was soft. Furthermore, the melt viscosity was 0.5 Pa·s, which is a composition with low viscosity, a large molding shrinkage rate, and a low dielectric breakdown strength, but other properties were good.

[0101] Example 10 is a crystalline radical polymerizable composition in which the crystalline radical polymerizable compound of Example 5 is changed to a room temperature liquid radical polymerizable compound and the blending ratio of the radical polymerizable compound is changed. Since the amount of the crystalline radical polymerizable compound is small, the hardness of the composition is 0, soft, and as a result of the low glass transition temperature, other properties were good.

[0102] Example 12 is a crystalline radical polymerizable composition in which the blending amount of the inorganic filler of Example 8 is changed. The melting start temperature was not observed because the flow stopped during the measurement. Also, the melt viscosity was high and the flow length was short, but other properties were good.

[0103] Therefore, even in Examples 9 and 10 and Example 12, depending on the desired application, required quality, etc., there may be cases where the conditions are met, so it can be considered as a single guideline and it has been found that it is applicable to applications where good properties are required.

[0104] Also, in both Comparative Examples 1 and 2, compared with the crystallinity, the melt viscosity was high (Comparative Example 1 can be compared with Example 4), resulting in inferior handleability and the like.

[0105] Next, as Example 13, an in-vehicle reactor coil was sealed, molded, or fixed using the crystalline radical polymerizable composition for in-vehicle reactor coils of Example 1, and as Comparative Example 3, an in-vehicle reactor coil was sealed, molded, or fixed using the crystalline radical polymerizable composition for in-vehicle reactor coils of Comparative Example 2. The sealing property, moldability, and fixability were examined. The results are shown in Table 4.

[0106]

Table 4

[0107] As Comparative Example 3, an in-vehicle reactor coil was sealed, molded, or fixed using the crystalline radical polymerizable composition for an in-vehicle reactor coil of Comparative Example 2, and as a result, the sealing property and the like were inferior.

[0108] As described above, it has been found that the crystalline radical polymerizable composition for an in-vehicle reactor coil containing at least a crystalline radical polymerizable compound is excellent in handleability and also has good fluidity.

Industrial Applicability

[0109] The crystalline radical polymerizable composition for an in-vehicle reactor coil of the present invention and a molded article using the same are excellent in electrical insulation and heat resistance, and thus it is possible to improve the durability of an in-vehicle reactor coil sealing body, molded article, or fixing body.

Claims

1. A crystalline radically polymerizable composition for an in-vehicle reactor coil, comprising at least a crystalline radically polymerizable compound having a glass transition point and a melting point, an inorganic filler, a silane coupling agent, and a radical polymerization initiator, wherein the crystalline radically polymerizable composition for an in-vehicle reactor coil is solid at 23°C. The glass transition point is in the range of 105 to 250°C, the melting point is in the range of 30 to 150°C, the melt viscosity of the crystalline radically polymerizable compound is in the range of 0.5 to 2400 Pa·s, the content of the inorganic filler is 50 to 95% by weight based on the total amount of the crystalline radically polymerizable composition, and when measured by a measurement method conforming to JIS K6911, the dielectric breakdown strength of the sealed body sealed with the crystalline radically polymerizable composition for an in-vehicle reactor coil is 10 to 17 kV / mm. A crystalline radically polymerizable composition for an in-vehicle reactor coil characterized by the above.

2. The crystalline radically polymerizable compound according to claim 1, wherein the crystalline radically polymerizable compound contains one or more selected from crystalline unsaturated polyesters, crystalline epoxy (meth) acrylates, crystalline urethane (meth) acrylates, crystalline polyester (meth) acrylates, crystalline polyether (meth) acrylates, crystalline radically polymerizable monomers, and crystalline radically polymerizable multimers. A crystalline radically polymerizable composition for an in-vehicle reactor coil.

3. The melt viscosity of the crystalline radically polymerizable composition for an in-vehicle reactor coil measured by a high-temperature type flow tester is 7 to 1000 Pa·s at a measurement temperature of 90°C, a die diameter of 0.5 mm, a length of 1.0 mm, and a pressure of 30 kgf / cm2, or 1 to 7 Pa·s at a pressure of 1 kgf / cm2. The crystalline radically polymerizable composition for an in-vehicle reactor coil according to claim 1 or 2.

4. The ratio of the crystalline radically polymerizable compound to the total amount of the radically polymerizable compound is 30 parts by weight or more. A crystalline radically polymerizable composition for an in-vehicle reactor coil according to any one of claims 1 to 3.

5. The weight average molecular weight of the crystalline radically polymerizable compound is 100 to 100,000, and the crystalline radically polymerizable composition for in-vehicle reactor coils according to any one of claims 1 to 4, characterized in that.

6. An in-vehicle reactor coil sealing body sealed with the crystalline radically polymerizable composition for in-vehicle reactor coils according to any one of claims 1 to 5.

7. Granular matter composed of the crystalline radically polymerizable composition for in-vehicle reactor coils according to any one of claims 1 to 5.

8. A method for manufacturing an in-vehicle reactor coil sealing body, comprising a step of sealing an electric and electronic component by an insert molding method by an injection molding method or a transfer molding method using the granular matter composed of the crystalline radically polymerizable composition for in-vehicle reactor coils according to claim 7.

Images