Thin-Film Polymer Laminated Capacitor and Manufacturing Method Thereof

Abstract

The present invention relates to a thin-film polymer laminated capacitor having a structure in which a resin film and an internal electrode metal layer are alternately layered. The resin film has a high-molecular-weight structure produced by polymerizing a first monomer formed as a polyfunctional monomer and a second monomer formed as a monofunctional monomer. The first monomer and the second monomer satisfy at least one of conditions (a) and (b). (a) The HLB value H 2 of the second monomer is smaller than the HLB value H 1of the first monomer. (b) When a first polymer part formed using only the first monomer as a monomer and a second polymer part formed using only the second monomer as a monomer are produced using the following production method (1), and the water absorption rate of the polymer parts is measured after they have been subjected to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the second polymer part is smaller than the water absorption rate of the first polymer part.The manufacturing method (1) comprises: providing the first monomer or the second monomer as a test monomer, obtaining a mixture by mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol to 100 mol of the test monomer, pouring the mixture into a round plate; and preparing a disc-shaped polymer part measuring 30 mm in diameter × 1 mm in depth by irradiating the mixture poured into the round plate with UV radiation in a nitrogen atmosphere at 120 W and from a distance of 250 mm until progress of polymerization stops.

Description

Technical field

[0001] The present invention relates to a thin film polymer laminated capacitor and a method for producing the same. State of the art

[0002] As a capacitor, one is known which has a structure in which dielectric layers containing a resin and electrode layers containing a metal are alternately layered.

[0003] Patent Document 1 describes a thin-film polymer laminated film capacitor and a method for manufacturing the same. This document describes a method for manufacturing a thin-film polymer laminated film capacitor, the method comprising alternately and repeatedly performing a step of vapor-depositing a monomer on a rotary drum in a vacuum chamber to form a monomer layer, then irradiating the monomer layer with an electron beam to cure the monomer layer to form a resin film, and a step of vapor-depositing a metal material to form a metal film to produce a laminate in which the resin films and the metal films are alternately laminated on the rotary drum.

[0004] Patent Document 2 discloses a capacitor provided with two electrodes separated by a dielectric element. This document describes that the dielectric element comprises a polyfunctional acrylate polymer with a specific chemical structure. Cited publicationsPatent literature Patent Document 1: International Publication WO 2015 / 118693 Patent Document 2: JP S 60-157106 A Technical task

[0005] Conventional thin-film polymer laminated capacitors have been known to lack sufficient durability. In particular, conventional thin-film polymer laminated capacitors made using a polyfunctional monomer have been known to lack sufficient durability. Furthermore, with conventional capacitors, it has been difficult to provide a capacitor with sufficient durability and good electrical properties at the same time.

[0006] An object of the present invention is to provide a thin film polymer laminated capacitor having sufficient electrical performances required for a thin film polymer laminated capacitor and having improved durability. Solution to the task

[0007] The above object can be achieved by the following embodiments of the present invention. <Ausführungsform 1>

[0008] A thin-film polymer laminated capacitor having a structure in which resin thin films and internal electrode metal layers are alternately layered, wherein the resin thin films have a polymer structure formed by polymerizing a first monomer formed as a polyfunctional monomer and a second monomer formed as a monofunctional monomer, and wherein the first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) an HLB value H 2 of the second monomer is less than an HLB value H 1 of the first monomer; (b) when a first polymer part formed using only the first monomer as a monomer and a second polymer part formed using only the second monomer as a monomer are produced by the following production method (1), and a water absorption rate is measured for each of the polymer parts after being subjected to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the second polymer part is smaller than the water absorption rate of the first polymer part, the production method (1) consisting in: Providing the first monomer or the second monomer as a test monomer; mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the test monomer to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth. <Ausführungsform 2>

[0009] Capacitor according to embodiment 1, wherein a difference between the HLB value H 1 of the first monomer and the HLB value H 2 of the second monomer (H 1 - H 2 ) is 0.1 or more. <Ausführungsform 3>

[0010] Capacitor according to embodiment 2, wherein the difference (H 1 - H 2 ) is 0.5 or more. <Ausführungsform 4>

[0011] Capacitor according to one of embodiments 1 to 3, wherein the HLB value H 1 of the first monomer is in the range of 3.0 to 5.0 and the HLB value H 2of the second monomer is in the range of 2.0 to 4.0. <Ausführungsform 5>

[0012] A capacitor according to any one of embodiments 1 to 4, wherein the molar ratio of the first monomer to the second monomer is 10:90 to 90:10. <Ausführungsform 6>

[0013] Capacitor according to any one of embodiments 1 to 5, wherein the first monomer and / or the second monomer comprises / comprising an acrylate group or a methacrylate group or the first monomer and / or the second monomer comprises / comprising a monomer having an acrylate group or a methacrylate group. <Ausführungsform 7>

[0014] The capacitor according to embodiment 6, wherein both the first monomer and the second monomer have an acrylate group or a methacrylate group, or both the first monomer and the second monomer comprise a monomer having an acrylate group or a methacrylate group. <Ausführungsform 8>

[0015] A capacitor according to any one of embodiments 1 to 7, wherein the first monomer is a bifunctional monomer. <Ausführungsform 9>

[0016] Capacitor according to one of embodiments 1 to 8, wherein the first monomer is tricyclodecane dimethanol diacrylate or tricyclodecane dimethanol dimethacrylate or the first monomer comprises tricyclodecane dimethanol diacrylate or tricyclodecane dimethanol dimethacrylate; and / or the second monomer is 2-(biphenyl-2-yloxy)ethyl acrylate or 4-phenylbenzyl acrylate or the second monomer comprises 2-(biphenyl-2-yloxy)ethyl acrylate or 4-phenylbenzyl acrylate. <Ausführungsform 10>

[0017] A capacitor according to any one of embodiments 1 to 9, wherein in a third polymer part produced by the following production method (2), when subjected to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the third polymer part is 0.8% or less, wherein the production method (2) consists in the following: Providing the first monomer and the second monomer; Mixing the first monomer and the second monomer in the same ratio as the molar ratio in the resin thin film to obtain a monomer mixture; Mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the monomer mixture to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth. <Ausführungsform 11>

[0018] A capacitor according to any one of embodiments 1 to 10, wherein the capacitor has a relative permittivity of 2.0 or more as measured at 25°C and 1 kHz and a tan δ of less than 1.0% as measured at 25°C and 1 kHz. <Ausführungsform 12>

[0019] A method for producing a thin-film polymer laminated capacitor having a structure in which resin thin films and internal electrode metal layers are alternately layered, the method comprising: curing a monomer layer comprising a first monomer formed as a polyfunctional monomer and a second monomer formed as a monofunctional monomer to form the resin film; and wherein the first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) an HLB value H 2 of the second monomer is less than an HLB value H 1 of the first monomer, (b) when a first polymer part formed using only the first monomer as a monomer and a second polymer part formed using only the second monomer as a monomer are produced by the following production method (1), and a water absorption rate is measured for each of the polymer parts after being subjected to conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the second polymer part is smaller than the water absorption rate of the first polymer part, the production method (1) consisting in: Providing the first monomer or the second monomer as a test monomer; Mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the test monomer to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth. Advantageous effects of the invention

[0020] According to the present invention, it is possible to provide a thin film polymer laminated capacitor having sufficient electrical performances required for a thin film polymer laminated capacitor and having improved durability. Short description of the drawings [ Fig. 1] Fig. 1 shows a perspective schematic view of a thin film polymer laminated capacitor 1. [ Fig. 2] Fig.2 shows a graph illustrating the results of measurements of a respective water absorption rate for capacitors according to Example 1 and Comparative Example 1. Method of carrying out the present inventionThin film polymer laminated capacitor

[0021] The thin film polymer laminated capacitor of the present disclosure has a structure in which resin thin films and internal electrode metal layers are alternately layered, wherein the resin thin films have a polymer structure formed by polymerizing a first monomer formed as a polyfunctional monomer and a second monomer formed as a monofunctional monomer, and wherein the first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) an HLB value H 2 of the second monomer is less than an HLB value H 1 of the first monomer; (b) when a first polymer part formed using only the first monomer as a monomer and a second polymer part formed using only the second monomer as a monomer are produced by the following production method (1), and a water absorption rate is measured for each of the polymer parts after being subjected to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the second polymer part is smaller than the water absorption rate of the first polymer part, the production method (1) consisting in: Providing the first monomer or the second monomer as a test monomer; Mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the test monomer to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth.

[0022] With conventional capacitors, there were cases where it was not possible to produce a capacitor with good durability. In particular, with conventional capacitors made using a polymer derived from a polyfunctional monomer, although it was possible to obtain a polymer structure of resin thin films with a relatively high degree of crosslinking, there were cases where it was not possible to obtain a capacitor with good durability.

[0023] According to the present invention, however, it is possible to provide a thin film polymer laminated capacitor having performances required for a thin film polymer laminated capacitor and improved durability.

[0024] Specifically, in the capacitor satisfying the above condition (a), the resin thin films are formed using not only a polyfunctional monomer but also a monofunctional monomer with a relatively low HLB value. Without wishing to be bound by theory, it is believed that in this case, a sufficient degree of crosslinking of a polymer structure in the resin thin films can be ensured due to the polyfunctional monomer, and a reduced water absorption rate of the resin thin films can also be achieved due to polymer units derived from the monofunctional monomer with a relatively low HLB value, and thus excellent durability can be achieved.

[0025] Furthermore, in the capacitor of the present invention satisfying the above condition (b), the resin thin films are formed using not only a polyfunctional monomer but also a monofunctional monomer, which forms a polymer with a relatively low water absorption rate. Without wishing to be bound by theory, it is believed that in this case, a sufficient degree of crosslinking of a polymer structure in the resin thin films can be ensured due to the polyfunctional monomer, and a reduced water absorption rate of the resin thin films can be achieved also due to polymer units derived from the monofunctional monomer, and thus excellent durability can be achieved.

[0026] Without wishing to be bound by theory, it is further believed that when a monofunctional monomer is included, shrinkage of the resin film due to curing is suppressed and generation of internal stress is suppressed compared to a case where only a polyfunctional monomer is used. As a result, warpage and cracking can be reduced, and delamination in the capacitor can be prevented or suppressed. In this case, it is believed that since moisture penetration into the cracked or delaminated portion is suppressed, the water absorption rate of the capacitor can be further effectively suppressed.

[0027] The method according to the present disclosure is described in more detail below. First monomer and second monomer

[0028] The resin film has a polymer structure formed by polymerizing a first monomer formed as a polyfunctional monomer and a second monomer formed as a monofunctional monomer. Preferably, the molar ratio of monomer units derived from the first monomer and monomer units derived from the second monomer, based on all monomer units constituting the polymer structure of the resin film, is 80% or more, 85% or more, 90% or more, or 95% or more, and particularly preferably 100%.

[0029] The polyfunctional monomer has a plurality (especially two) polymerizable functional groups in one molecule. The monofunctional monomer has one polymerizable functional group in one molecule.

[0030] Examples of the polymerizable functional group include a vinyl group (particularly, an acrylic group, a methacrylic group, an acrylate group, and a methacrylate group), an acrylonitrile group, and an epoxy group. Preferably, the polyfunctional monomer and / or the monofunctional monomer have / have at least one of an acrylate group and a methacrylate group. Most preferably, both the polyfunctional monomer and the monofunctional monomer have an acrylate group. Note that a monomer having an acrylate group is an acrylate monomer, and a monomer having a methacrylate group is a methacrylate monomer.

[0031] The polyfunctional monomer and the monofunctional monomer may be polymerized to form a monomer under conditions such as electron beam irradiation via a polymerizable functional group.

[0032] The ratio of the first monomer to the second monomer, namely the ratio of the polyfunctional monomer to the monofunctional monomer, can be suitably adjusted according to the properties desired for a capacitor.

[0033] The molar ratio of the first monomer to the second monomer is preferably 10:90 to 90:10. More preferably, this molar ratio is 20:80 to 80:20, 30:70 to 70:30, 40:60 to 60:40, or 45:55 to 55:45.

[0034] In other words, the number of moles of the second monomer relative to the total number of moles of the first monomer and the second monomer is preferably 10 to 90%, 20 to 80%, 30 to 70%, 40 to 60%, or 45 to 55%.

[0035] When the ratio of the first monomer to the second monomer is in the above range, it is possible to provide a capacitor having good electrical properties and, in particular, excellent durability. Polyfunctional monomer

[0036] The polyfunctional monomer is in particular a bifunctional monomer. The polyfunctional monomer preferably has an acrylate or methacrylate group. The polyfunctional monomer preferably has an acrylate group. In a further embodiment, the polyfunctional monomer preferably comprises a monomer with an acrylate or methacrylate group or consists of a monomer with an acrylate or methacrylate group. Most preferably, the polyfunctional monomer comprises a monomer with an acrylate group or consists of a monomer with an acrylate group.

[0037] In one embodiment according to the present disclosure, the polyfunctional monomer may have a chemical structure represented by the following general formula (1):

[0038] In Formula (1) is R 1 a group containing 1 to 20 carbon atoms; is R 2 H or CH 3 ; is n 2 to 4.

[0039] In formula (1), n ​​is preferably 2 to 3, more preferably n=2.

[0040] In formula (1) R contains 1 preferably 3 to 20, more preferably 6 to 20 and even more preferably 8 to 20 carbon atoms.

[0041] R 1 in formula (1) may comprise an oxygen atom. In this case, R 1 Contain 1 to 20, 1 to 10, 1 to 5, 1 to 3 or 1 to 2 oxygen atoms or one oxygen atom.

[0042] R 1in formula (1) may in particular comprise an ether bond. In this case, R 1 1 to 20, 1 to 10, 1 to 5, 1 to 3 or 1 to 2 ether bonds or one ether bond.

[0043] R 1 in formula (1) preferably consists of carbon atoms and hydrogen atoms and optionally oxygen atom(s).

[0044] In formula (1), R 1 a (linear or branched) aliphatic radical, an alicyclic radical and / or an aromatic radical.

[0045] If R 1in formula (1), an increase in molecular mass leads to an increase in molar volume, and it may be possible to achieve an effect of reducing tan δ of a capacitor. Furthermore, due to the bulkiness and rigidity, it may be possible to inhibit the micro-Brownian motion of backbone segments in the three-dimensional network of a polymer caused by an elevated temperature, whereby it may be possible to provide a capacitor with a relatively high glass transition temperature and excellent heat resistance. In addition, since the shrinkage of resin thin films due to curing is relatively suppressed, the interlayer adhesion in a capacitor can be further improved.

[0046] If R 1in formula (1) contains an aromatic residue, the presence of a π-electron conjugation system leads to a polarization from the dipole orientation that is greater than a simple alkyl skeleton, whereby a relatively high permittivity can be achieved. Furthermore, especially when R 1 A bulky structure such as a biphenyl structure may be possible to achieve an effect of reducing the tan δ of a capacitor, as described above with respect to the alicyclic group. Furthermore, since the shrinkage of resin films due to curing is relatively suppressed, interlayer adhesion in a capacitor can be further improved.

[0047] In formula (1) R contains 1 Preferably no unsaturation. The absence of unsaturation may make it possible to suppress an increase in the tan δ of a capacitor.

[0048] Exemplary chemical structures M1 to M6 of the polyfunctional monomer that can be used in the present invention are shown below.

[0049] “n” in formulas M3 and M4 can be 1 to 20, preferably 5 to 18, more preferably 8 to 15, and even more preferably 9 to 12.

[0050] “n” in formulas M5 and M6 may each be 1 to 20, preferably 1 to 10, more preferably 2 to 6, and even more preferably 3 to 4.

[0051] Examples of preferred chemical structures of the polyfunctional monomer are shown below.

[0052] Particularly preferred polyfunctional monomers include: tricyclodecanedimethanol diacrylate, tricyclodecanedimethanol dimethacrylate, Dodecane-1,12-diyldimethacrylate, Dodecane-1,12-diyldiacrylate, α,α'-[Propane-2,2-diylbis-(4,1-phenylene)]bis[ω-(acryloyloxy)poly(oxyethylene)]. Monofunctional monomer

[0053] The monofunctional monomer preferably comprises an acrylate group or a methacrylate group. Most preferably, the monofunctional monomer comprises an acrylate group. In a further embodiment, the monofunctional monomer preferably comprises a monomer having an acrylate group or a methacrylate group, or consists of a monomer having an acrylate group or a methacrylate group. Most preferably, the monofunctional monomer comprises a monomer having an acrylate group or consists of a monomer having an acrylate group.

[0054] In one embodiment according to the present disclosure, the monofunctional monomer may have a chemical structure represented by the following general formula (2).

[0055] In formula (2) is R 3 a group containing 1 to 20 carbon atoms; is R 2 H or CH3 . R 2 in formula (2) is preferably H. R 3 in formula (2) preferably has 3 to 20, more preferably 6 to 20 and even more preferably 8 to 20 carbon atoms. R 3 in formula (2) may comprise an oxygen atom. In this case, R 3 Contain 1 to 20, 1 to 10, 1 to 5, 1 to 3, 1 to 2 oxygen atoms or one oxygen atom. R 3 in formula (2) may in particular comprise an ether bond. In this case, R 3 1 to 20, 1 to 10, 1 to 5, 1 to 3, 1 to 2 ether bonds or one ether bond. R 3 in formula (2) preferably consists of carbon atoms and hydrogen atoms and optionally oxygen atom(s).

[0056] In formula (2), R 3 comprise a (linear or branched) aliphatic radical, alicyclic radical and / or aromatic radical.

[0057] If R 3 in formula (2), an increase in molecular mass leads to an increase in molar volume, and thus, it may be possible to achieve an effect of reducing tan δ of a capacitor. Furthermore, due to the bulkiness and rigidity, it may be possible to inhibit the micro-Brownian motion of backbone segments in the three-dimensional network of a polymer caused by elevated temperature, thereby making it possible to provide a capacitor with a relatively high glass transition temperature and excellent heat resistance. In addition, since the shrinkage of resin thin films due to curing is relatively suppressed, interlayer adhesion in a capacitor can be further improved.

[0058] If R 3in formula (2) contains an aromatic residue, the presence of a π-electron conjugation system leads to a polarization from the dipole orientation that is greater than a simple alkyl skeleton, whereby a relatively high permittivity can be achieved. Furthermore, especially when R 3 A bulky structure such as a biphenyl structure may be possible to achieve an effect of reducing the tan δ of a capacitor, as described above with respect to the alicyclic group. Furthermore, since the shrinkage of resin films due to curing is relatively suppressed, interlayer adhesion in a capacitor can be further improved.

[0059] Particularly preferably, R 3 a biphenyl structure.

[0060] In formula (2) R contains 3Preferably no unsaturation. The absence of unsaturation may make it possible to suppress an increase in the tan δ of a capacitor.

[0061] Exemplary chemical structures S1 to S6 and S'1 to S'4 of the monofunctional monomer which can be used in the present invention are shown below

[0062] "n" in the formulas S1 and S2 and S'1 and S'2 can each be 0 to 20, preferably 1 to 10, more preferably 1 to 5, even more preferably 1 to 3 or 1 to 2, and most preferably n = 1.

[0063] "n" in formulas S5 and S6 may be 1 to 20, preferably 5 to 18, more preferably 12 to 16.

[0064] “n” in formulas S7 and S8 may be 1 to 20, preferably 10 to 20, more preferably 12 to 18, and even more preferably 14 to 16.

[0065] Exemplary chemical structures of the preferred monofunctional monomer are shown below.

[0066] Particularly preferred monofunctional monomers include: 2-(Biphenyl-2-yloxy)ethyl acrylate, 4-phenylbenzyl acrylate, 2-[(Tricyclo[5.2.1,0(2,6)]deca-4-en-9-yl)oxy]ethyl acrylate, 2-[(Tricyclo[5.2.1,0(2,6)]deca-4-en-9-yl)oxy]ethyl methacrylate.

[0067] As particularly preferred combinations for the first monomer and the second monomer, the following combinations (1) and (2) can be mentioned: (1) a combination of tricyclodecanedimethanol diacrylate and 2-(biphenyl-2-yloxy)ethyl acrylate; (2) a combination of tricyclodecanedimethanol diacrylate and 4-phenylbenzyl acrylate.

[0068] In one embodiment of the present invention, the first monomer and / or the second monomer comprise / comprises an acrylate or methacrylate group (i.e., an acrylate or methacrylate monomer) or the first monomer and / or the second monomer comprise / comprises a monomer having an acrylate or methacrylate group (i.e., an acrylate or methacrylate monomer).

[0069] In one embodiment of the present invention, both the first monomer and the second monomer have an acrylate or methacrylate group (i.e., acrylate or methacrylate monomers) or both the first monomer and the second monomer comprise a monomer having an acrylate or methacrylate group (i.e., acrylate or methacrylate monomer).

[0070] In one embodiment of the present invention, the first monomer is tricyclodecanedimethanol diacrylate or tricyclodecanedimethanol dimethacrylate or the first monomer comprises tricyclodecanedimethanol diacrylate or tricyclodecanedimethanol dimethacrylate, and / or the second monomer is 2-(biphenyl-2-yloxy)ethyl acrylate or 4-phenylbenzyl acrylate or the second monomer comprises 2-(biphenyl-2-yloxy)ethyl acrylate or 4-phenylbenzyl acrylate. HLB value

[0071] In an embodiment according to the present disclosure, the capacitor according to the present invention satisfies the above-described condition (a), namely that an HLB value H 2 of the second monomer, which is a monofunctional monomer, is less than an HLB value H 1 of the first monomer, which is a polyfunctional monomer.

[0072] An HLB value is an index that indicates the degree of affinity for water and oil and is calculated based on the types of functional groups a monomer is made of. The higher the HLB value, the more hydrophilic a monomer is, as a rule. An HLB value can be calculated using the Davis method.

[0073] The difference between an HLB value H 1 of the first monomer and an HLB value H 2 of the second monomer (H 1 - H 2 ) is preferably 0.1 or more. More preferably, the difference "(H 1 - H 2 )" 0.2 or more, 0.3 or more, 0.4 or more or 0.5 or more and / or 3.0 or less, 2.5 or less, 2.0 or less, 1.9 or less, 1.8 or less, 1.7 or less, 1.6 or less, 1.5 or less, 1.4 or less, 1.3 or less or 1.2 or less.

[0074] An HLB value H 1of the first monomer is preferably between 3.0 and 5.0. More preferably, this range is 2.1 or more, 2.2 or more, 2.3 or more, 2.4 or more, 2.5 or more, 2.6 or more, 2.7 or more, 2.8 or more, 2.9 or more, or 4.0 or more and / or 4.9 or less, 4.8 or less, 4.7 or less, 4.6 or less, 4.5 or less, 4.4 or less, or 4.3 or less.

[0075] Furthermore, there is an HLB value H 2 of the second monomer is preferably between 2.0 and 4.0. More preferably, this range is 2.1 or more, 2.2 or more, 2.3 or more, 2.4 or more, 2.5 or more, 2.6 or more, 2.7 or more, 2.8 or more, 2.9 or more, or 3.0 or more and / or 2.9 or less, 2.8 or less, 2.7 or less, 2.6 or less, 2.5 or less, 2.4 or less, 2.3 or less, or 2.2 or less.

[0076] An HLB value H 1 of the first monomer and an HLB value H 2of the second monomer can be calculated using the Davis method.

[0077] HLB values ​​calculated for some exemplary polyfunctional monomers and monofunctional monomers using the Davis method are shown below as examples in Table 1. [Table 1] name HLB value Monomer Chemical structure of the monomer Tricyclodecanedimethanol diacrylate 4,2 bifunctional monomer Tricyclodecanedimethanol dimethacrylate 3,3, bifunctional monomer Dodecane-1,12-diyl diacrylate 4,2 bifunctional monomer Dodecane-1,12-diyldimethacrylate 3,3, bifunctional monomer α, α'-[Propane-2,2-diylbis-(4,1-phenylene)]bis[ω-(acryloyloxy)-poly(oxyethylene)] 4,1 bifunctional monomer nona-1,9-diyl diacrylate 5,6 bifunctional monomer nona-1,9-diyldimethacrylate 5,9 bifunctional monomer Triethylene glycol dimethacrylate 8,7 bifunctional monomer 2-(Biphenyl-2-yloxy)ethyl acrylate 3,1 monofunctional monomer 4-Phenylbenzyl acrylate 2,3 monofunctional monomer Isooctadecyl acrylate -0,1 monofunctional monomer n-Octadecyl methacrylate -0,6 monofunctional monomer 2-[(Tricyclo-[5.2.1.0(2,6)]deca -4-en-9-yl)oxy]-ethyl acrylate 4,0 monofunctional monomer 2-[(Tricyclo-(5.2.1.0(2,6)]deca -4-en-9-yl)oxy]-ethyl methacrylate 3,6 monofunctional monomer HLB value calculation according to the Davis method

[0078] An HLB value can be calculated using the following equation (A) according to the Davis method: HLB value = 7 + ∑ (index number of the hydrophilic group) + ∑ (index number of the lipophilic group)

[0079] Index numbers for essential hydrophilic groups are as follows: Ester group (-COO-): 2,4 Hydroxyl group (-OH): 1,9 Ether group (-O-): 1,3 (-CH 2 CH 2 O-): 0,33

[0080] Index numbers for essential lipophilic groups are as follows: Alkan (-CH 2 -): -0,475 Methyl group (-CH 3 ): -0,475 Alkene (-CH=): -0,475 (-CH 2 CH(CH 3 )O-): -0,15

[0081] For example, in the case of tricyclodecanedimethanol dimethacrylate, the HLB value can be calculated as follows: Ester group = 2 Alkane = 12 Alkene = 2 × 2 Methyl group = 2, from these values ​​and based on the index numbers listed above, HLB value = 2.25 (approx. 2.3).

[0082] It should be noted that the ring structure in the molecular structure of tricyclodecanedimethanol dimethacrylate and directly attached methylene group(s) are all considered to be alkanes (the ring structure is formed from a total of 10 alkanes).

[0083] For example, in the case of 2-(biphenyl-2-yloxy)ethyl acrylate, the HLB value can be calculated as follows: Ester group = 1 Alkene = 2 + 6 × 2 (-CH 2 CH 2 O-) = 1from these values ​​and based on the index numbers listed above, HLB value = 3.08 (approx. 2.1).

[0084] It should be noted that the two benzene rings in the molecular structure of 2-(biphenyl-2-yloxy)ethyl acrylate are considered to be formed from six alkenes each. Water absorption rate

[0085] In another embodiment according to the present disclosure, the capacitor according to the present invention satisfies the above-described condition (b), namely that when a first polymer part formed using only the first monomer as a monomer and a second polymer part formed using only the second monomer as a monomer are produced by the above-described production method (1), and a water absorption rate is measured for each of the polymer parts after being subjected to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the second polymer part is smaller than the water absorption rate of the first polymer part.

[0086] The difference between the water absorption rate (%) of the second polymer part and the water absorption rate (%) of the first polymer part may be greater than or equal to 0.05. Preferably, this difference is 0.1 or more, 0.2 or more, or 0.3 or more. The upper limit of this difference is not specifically limited, but may be, for example, 2.0 or less.

[0087] The water absorption rate of the first polymer part can be 0.5% to 2.0%. Preferably, the water absorption rate of the first polymer part is 0.7% or more, 0.8% or more, 0.9% or more, and / or 1.8% or less, 1.6% or less, 1.4% or less, or 1.2% or less.

[0088] The water absorption rate of the second polymer part can be 0.1% to 1.0%. Preferably, the water absorption rate of the first polymer part is 0.2% or more, 0.3% or more, 0.4% or more, and / or 1.0% or less, 0.9% or less, 0.8% or less, or 0.7% or less.

[0089] The water absorption rate of the first polymer part and the second polymer part can be calculated from the weight change of a polymer part when it is subjected to a water absorption test in which the polymer part to be measured is exposed to 40 °C and 95% relative humidity for 40 h.

[0090] In other words, the weight change (%) can be calculated from the value of the weight of a polymer part measured before the water absorption test and the weight of the polymer part measured immediately after the water absorption test, and this weight change (%) can be used as the water absorption rate. Specifically, the weight change (%) can be calculated using the following formula: Weight change (%) = 100 × (weight after water absorption test − weight before water absorption test) / weight before water absorption test. Process for producing the first and second polymer parts

[0091] The first polymer part and the second polymer part for measuring a water absorption rate are manufactured according to the manufacturing method (1).

[0092] The manufacturing process (1) consists of the following: Providing the first monomer or the second monomer as a test monomer; mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the test monomer to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth.

[0093] For the first monomer or the second monomer provided as a test monomer, reference may be made to the above description.

[0094] The photoinitiator can be selected according to the type of test monomer. Specific photoinitiators include 2-benzyl-2-dimethylamino-4'-morpholinobutyrophenone. Mixing of the test monomer and the photoinitiator can be performed using known methods.

[0095] The circular tray is dimensioned so that when a mixture placed inside is subjected to UV-cured polymerization, a disc-shaped polymer part with dimensions of 30 mm in diameter and 1 mm in depth is produced. Specifically, the circular tray can be a round tray with a flat surface of 30 mm in inner diameter and 1 to 5 cm in depth, and the mixture can be poured into the circular tray so that it is 1 mm high.

[0096] UV irradiation is carried out in such a way as to cause polymerization of the test monomer and is carried out at an intensity of 120 W and at a distance of 250 mm from the sample.

[0097] The duration of UV irradiation is determined depending on the type of test monomer, in particular so that the polymerization of the test monomer (i.e., the curing of the mixture) is completed, and is continued until no more polymerization occurs, even if further exposure to UV irradiation occurs. A person skilled in the art is able to determine the duration of such UV irradiation depending on the type of test monomer. For example, if the test monomer is an acrylate monomer (a monomer with an acrylate group), the UV irradiation may be carried out for 60 s. For example, if the test monomer is a methacrylate monomer (a monomer with a methacrylate group), the UV irradiation may be carried out for 360 s. If the test monomer has an acrylate group and a methacrylate group, the UV irradiation may be carried out for 360 s. Thin-film polymer laminated capacitor

[0098] The thin film polymer laminated capacitor according to the present invention has a structure in which resin thin films and internal electrode metal layers are alternately layered.

[0099] Fig. 1 shows a perspective schematic view of a thin film polymer laminated capacitor 1. The thin film polymer laminated capacitor 1 comprises a laminate 2 in which resin films and metal films (ie, internal electrode metal films) are alternately layered, with two external electrodes 3 and 4 attached to the laminate 2.

[0100] The thin film polymer laminated capacitor can have 10 to 10,000 layers, 50 to 5,000 layers, or 100 to 2,000 layers.

[0101] The resin thin films may have a thickness of 10 nm to 3000 nm, preferably a thickness of 100 to 1500 nm.

[0102] Examples of metal materials constituting the inner electrode metal layer include at least one metal material selected from the group consisting of Al, Cu, Zn, Sn, Au, Ag and Pt and combinations thereof.

[0103] The inner electrode metal layer may have a thickness of 1 nm to 100 nm, preferably 10 nm to 40 nm. Furthermore, the metal thin film preferably has a vapor deposition resistance of 1 to 50 Ω / □, 5 to 40 Ω / □, or 5 to 30 Ω / □. Relative permittivity

[0104] Preferably, the capacitor according to the present invention has a relative permittivity of 2.0 or more, measured at 25°C and 1 kHz. More preferably, the relative permittivity is 2.1 or more, 2.2 or more, 2.3 or more, or 2.5 or more. The upper limit of the relative permittivity is not specifically limited, but may be 5.0 or less.

[0105] The relative permittivity at 25 °C and 1 kHz can be calculated based on the capacitance measured with an LCR meter and the electrode area and the thickness of the dielectric. tan δ

[0106] Furthermore, the capacitor of the present invention, measured at 25°C and 1 kHz, preferably has a tan δ (also called dielectric loss factor) of less than 1.0%. More preferably, the tan δ is 0.9% or less, 0.8% or less, 0.7% or less, 0.6% or less, 0.5% or less, 0.4% or less, 0.3% or less, 0.2% or less, or 0.1% or less. The lower limit of tan δ is not specifically limited, but may be 0.05% or more.

[0107] Furthermore, the capacitor of the present invention, measured at 25°C and 1 kHz, preferably has a tan δ of less than 0.01. More preferably, the tan δ is 0.009 or less, 0.008 or less, 0.007 or less, 0.006 or less, 0.005 or less, 0.004 or less, 0.003 or less, 0.002 or less, or 0.001 or less. The lower limit of tan δ is not specifically limited, but may be 0.0005 or more.

[0108] The tan δ value at 25 °C and 1 kHz can be measured with an LCR meter. Water absorption rate of the condenser

[0109] With respect to the capacitor, in a third polymer part produced by the following manufacturing method (2), after exposure to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the third polymer part is 0.8% or less.

[0110] Preferably, this water absorption rate of the third polymer part is 0.7% or less, 0.6% or less, 0.5% or less, or 0.4% or less. The lower limit of the water absorption rate of the third polymer part is not specifically limited, but may be, for example, 0.01% or more. Manufacturing process (2): Manufacturing process of the third polymer part

[0111] The manufacturing process (2) for producing the third polymer part consists of the following: Providing the first monomer and the second monomer; Mixing the first monomer and the second monomer in the same ratio as the molar ratio in the resin thin film to obtain a monomer mixture; Mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the monomer mixture to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth.

[0112] For details of the manufacturing process (2) for producing the third polymer part, reference can be made to the above description of the manufacturing process (1). Method for manufacturing a capacitor

[0113] The method for producing the thin film polymer laminated capacitor according to the present invention is not particularly limited.

[0114] For example, the thin film polymer laminated capacitor according to the present invention can be manufactured by a method comprising alternately repeating a step of forming a resin film and a step of forming a metal film by vapor deposition of a metal material on a rotary drum in a vacuum chamber to produce a laminate having alternately layered resin films and metal films on the rotary drum.

[0115] As a method for such alternately layering resin thin films and metal thin films on a rotary drum, a known method such as the method described in WO 2015 / 118693 can be used.

[0116] The laminate formed on a rotating drum as above can be removed from the rotating drum and pressed under heating to planarize (flatten) the laminate. After the planarized laminate is cut into sticks, external electrodes are subsequently formed and then cut into chips to obtain a thin-film polymer laminated capacitor.

[0117] Preferably, the thin film polymer laminated capacitor according to the present invention can be manufactured by the following manufacturing method of the present invention. Method for manufacturing a capacitor of the present invention

[0118] A method for producing a thin-film polymer laminated capacitor having a structure in which resin thin films and internal electrode metal layers are alternately layered, the method comprising: curing a monomer layer comprising a first monomer formed as a polyfunctional monomer and a second monomer formed as a monofunctional monomer to form a resin film; and wherein the first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) an HLB value H 2 of the second monomer is less than an HLB value H 1 of the first monomer, (b) when a first polymer part formed using only the first monomer as a monomer and a second polymer part formed using only the second monomer as a monomer are produced by the following production method (1), and a water absorption rate is measured for each of the polymer parts after being subjected to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the second polymer part is smaller than the water absorption rate of the first polymer part, the production method (1) consisting in: Providing the first monomer or the second monomer as a test monomer; Mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the test monomer to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth.

[0119] For details of the manufacturing method according to the present invention, reference can be made to the above descriptions regarding the capacitor according to the present invention. In particular, with respect to the manufacturing method (1), conditions (a) and (b), reference can be made to the above descriptions regarding the capacitor according to the present invention.

[0120] When forming a resin thin film, the "curing treatment" can be performed by a known method, for example, the method described in WO 2015 / 118693. Specifically, for example, a monomer layer can be formed by vapor deposition of a monomer in a vacuum chamber, followed by irradiation with an electron beam to cure the monomer layer. Examples

[0121] The present invention will be explained in more detail below using examples. The present invention is not limited to the examples. Reference examples 1 to 3 (water absorption test)

[0122] In Reference Examples 1 to 3, the water absorption rate of the monomers shown in Table 2 below was investigated using a polymer mass (a polymer part). Reference example 1

[0123] In Reference Example 1, tricyclodecane dimethanol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: A-DCP), a bifunctional monomer, was used as a test monomer, and a polymer part was prepared as follows: Tricyclodecane dimethanol diacrylate was provided as a test monomer; a photoinitiator (2-benzyl-2-dimethylamino-4'-morpholinobutyrophenone, manufactured by Tokyo Chemical Industry Co., Ltd.) was mixed with the test monomer in a ratio of 0.2 ± 0.01 mol to 100 mol of the test monomer to form a mixture; the mixture was poured into a round bowl; and The mixture poured into the round dish was irradiated with UV radiation in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization ceased, to produce a disc-shaped polymer part with dimensions of 30 mm diameter by 1 mm depth.

[0124] Since the test monomer of Reference Example 1 was a monomer containing an acrylate group, the mixture was exposed to UV radiation for 60 s to complete the polymerization (i.e., the curing process). Although the polymer was slightly deformed, it was used as is for the evaluation of the water absorption rate.

[0125] The resulting polymer part was subjected to a water absorption test. Specifically, the polymer part was placed in a constant temperature and humidity chamber set at 40 °C and 95% relative humidity and left there for 40 hours. The weight change before and after the water absorption test was then measured and defined as the water absorption rate. The results are shown in Table 2 below. Reference example 2

[0126] In Reference Example 2, the water absorption test of a polymer part was conducted in the same manner as in Reference Example 1, except that 2-(biphenyl-2-yloxy)ethyl acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: A-LEN-10), a monofunctional monomer, was used as the test monomer instead of tricyclodecanedimethanol diacrylate. The result is shown in Table 2 below. The test monomer of Reference Example 2 is a monomer having an acrylate group. Reference example 3

[0127] In Reference Example 3, the water absorption test of a polymer part was conducted in the same manner as in Reference Example 1, except that a mixture of tricyclodecane dimethanol diacrylate and 2-(biphenyl-2-yloxy)ethyl acrylate (molar ratio: 50:50) was used instead of tricyclodecane dimethanol diacrylate as the test monomer. The result is shown in Table 2 below. [Table 2] polyfunctional monomer monofunctional monomer HLB value Water absorption rate (%) Reference example 1 Tricyclodecanedimethanol diacrylate - 4,2 1,11 Reference example 2 - 2-(Biphenyl-2-yloxy)ethyl acrylate 3,1 0,33 Reference example 3 Tricyclodecanedimethanol diacrylate 2-(Biphenyl-2-yloxy)ethyl acrylate - 0,53

[0128] As can be seen from Table 2, the polymer part formed from 2-(biphenyl-2-yloxy)ethyl acrylate (Reference Example 2) had a relatively low water absorption rate compared to the polymer part formed from tricyclodecanedimethanol diacrylate (Reference Example 1).

[0129] Furthermore, the polymer part formed from a mixture of tricyclodecane dimethanol diacrylate and 2-(biphenyl-2-yloxy)ethyl acrylate (Reference Example 3) had a relatively low water absorption rate compared to the polymer part formed from tricyclodecane dimethanol diacrylate only (Reference Example 1), as shown in Table 2.

[0130] These results show that by combining a polyfunctional monomer having a relatively high water absorption rate measured on a polymer part and a monofunctional monomer having a relatively low water absorption rate measured on a polymer part, a polymer with a reduced water absorption rate can be obtained.

[0131] Furthermore, Table 2 also shows the HLB value calculated for each of the monomers using the Davis method. As can be seen from Table 2, the HLB value calculated for 2-(biphenyl-2-yloxy)ethyl acrylate, which is a monofunctional monomer, is 3.1, and the HLB value for tricyclodecane dimethanol diacrylate, which is a bifunctional monomer, is 4.2. Thus, 2-(biphenyl-2-yloxy)ethyl acrylate has a lower HLB value than tricyclodecane dimethanol diacrylate. The results in Table 2 demonstrate that there is a correlation between the HLB value of monomers and the water absorption rate measured on a polymer part. Example 1 and Comparative Example 1

[0132] In Example 1 and Comparative Example 1, a capacitor was prepared using resin thin films formed from a monomer or a monomer mixture shown in Table 3, and the durability was evaluated. Example 1: Manufacturing a thin-film polymer laminated capacitor

[0133] A laminate in which resin thin films and metal thin films (internal electrode metal layers) were alternately layered in a total of 2550 layers was manufactured on a rotary drum by alternately and repeatedly performing a resin thin film formation step and a metal thin film formation step on the rotary drum in a vacuum chamber.

[0134] In the resin thin film formation step, a resin thin film was formed from a monomer mixture containing tricyclodecanedimethanol diacrylate (product name: A-DCP, manufactured by Shin-Nakamura Chemical Co., Ltd.) as the bifunctional monomer and 2-(biphenyl-2-yloxy)ethyl acrylate (product name: A-LEN-10, manufactured by Shin-Nakamura Chemical Co., Ltd.) as the monofunctional monomer in a molar ratio of 50:50. Specifically, a monomer layer was formed by vapor-depositing this mixture of monomers in a vacuum chamber, and then the monomer layer was irradiated with an electron beam to cure the monomer layer to form the resin thin film. The electron beam irradiation was performed at an accelerating voltage of 5.0 kV and an irradiation current of 50 mA. The thickness of the resin thin film was 0.5 µm.

[0135] In the metal thin film formation step, aluminum (Al) as a metal material was vapor-deposited on a resin thin film, and a portion of the resin thin film was masked by vapor deposition of fluorine oil to form a metal thin film. The vapor deposition resistance of the metal thin film was 10 Ω / □.

[0136] The resulting laminate was removed from the rotary drum and pressed under heating at 160 °C to planarize (flatten) the laminate. Subsequently, the planarized laminate was cut into sticks, then coated with external electrodes (thermally sprayed brass metallicon material, copper plating, and tin plating), and then further cut into chips to obtain a thin-film polymer laminated capacitor according to Example 1. The capacitor had a size of 4.5 mm × 3.2 mm. Moisture resistance environmental test

[0137] The durability of the capacitor according to Example 1 was evaluated by a humidity resistance environmental test. In this humidity resistance environmental test, a capacitor was placed in a constant temperature and humidity chamber at 60°C and 90% relative humidity and left there for 1000 hours while applying a DC voltage of 50 V.

[0138] Before and after the moisture resistance environmental test, the tan δ (dielectric loss factor) and capacitance were measured. The tan δ was measured using an LCR meter at 25°C and 1 kHz. The capacitance (µF) of a capacitor was measured using an LCR meter at 25°C and 1 kHz. The results are shown in Table 3 below. Evaluation of the Capacitor's Water Absorption Rate

[0139] In Example 1, the water absorption rate of a capacitor was further evaluated according to the following water absorption test.

[0140] Specifically, a capacitor was placed in a constant temperature and humidity chamber at 40 °C and 95% relative humidity, and after a predetermined time, the weight change of the capacitor was measured, which in turn was used as the water absorption rate of the capacitor. The results are shown in Table 3 below and in Fig. 2 shown.

[0141] In Table 3 below, the water absorption rate for each of the capacitors was evaluated according to the following criteria: O (Good): The water absorption rate measured after the above 500-hour water absorption test was less than 1%. × (Poor): The water absorption rate measured after the above 500-hour water absorption test was 1% or more. Comparison example 1

[0142] In Comparative Example 1, a capacitor was prepared and evaluated in the same manner as in Example 1, except that only tricyclodecanedimethanol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: A-DCP), which is a bifunctional monomer, was used instead of the monomer mixture. The results are shown in Table 3 below and in Fig. 2 shown. [Table 3] polyfunctional monomer monofunctional monomer tan δ capacity ΔC Water absorption rate 0 (h) 1000 (h) 0 (h) % % µF % - Example 1 Tricyclodecanedimethanol diacrylate 2-(Biphenyl-2-yloxy)ethyl acrylate 0,37 0,55 0,913 5,2 ◯ Comparison example 1 Tricyclodecanedimethanol diacrylate 0,80 2,60 0,917 -5,7 ×

[0143] As can be seen from Table 3, the capacitors of Example 1 and Comparative Example 1 both had good initial capacitance (µF) in terms of initial characteristics. The initial tan δ value of Example 1 was better than that of Comparative Example 1.

[0144] On the other hand, in terms of properties after the moisture resistance environmental test, a deterioration in performance was observed for the capacitor of Comparative Example 1, which was made only from tricyclodecane dimethanol diacrylate, which is a bifunctional monomer. Specifically, an increase in tan δ and a decrease in capacitance (ΔC < 0) were observed.

[0145] In contrast, in the case of the capacitor of Example 1, a relatively good tan δ was maintained even after the moisture resistance environmental test and no decrease in capacitance was observed (ΔC > 0).

[0146] As can be seen from Table 3 and Fig. 2, the capacitor of Example 1 had an excellent water absorption rate (i.e., a relatively reduced water absorption rate) compared with the capacitor of Comparative Example 1.

[0147] From the above results, it can be concluded that by combining a polyfunctional monomer and a monofunctional monomer with specific HLB values ​​or by combining a polyfunctional monomer and a monofunctional monomer each with a specific water absorption rate measured on a polymer part, a thin-film polymer laminated capacitor with both good electrical performance and excellent durability can be provided.Without wishing to be bound by theory, it is believed that in such a capacitor, the use of a polyfunctional monomer ensures a sufficient degree of crosslinking of a polymer structure in resin thin films, and the use of a monofunctional monomer that provides a polymer with a relatively low water absorption rate leads to a reduced water absorption rate of the capacitor, and thus good electrical properties and excellent durability of the capacitor can be achieved. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2015 / 118693 [0004, 0115, 0120] JP S 60-157106 A

[0004]

Claims

[1] Thin film polymer laminated capacitor having a structure in which resin thin films and internal electrode metal layers are alternately layered, wherein the resin thin films have a polymer structure formed by polymerizing a first monomer formed as a polyfunctional monomer and a second monomer formed as a monofunctional monomer, and wherein the first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) an HLB value H 2 of the second monomer is less than an HLB value H 1 of the first monomer; (b) when a first polymer part formed using only the first monomer as a monomer and a second polymer part formed using only the second monomer as a monomer are produced by the following production method (1), and a water absorption rate is measured for each of the polymer parts after being subjected to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the second polymer part is smaller than the water absorption rate of the first polymer part, the production method (1) consisting in: Providing the first monomer or the second monomer as a test monomer; mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the test monomer to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth. [2] A capacitor according to claim 1, wherein a difference between the HLB value H 1 of the first monomer and the HLB value H 2 of the second monomer (H 1 - H 2 ) is 0.1 or more. [3] Capacitor according to claim 2, wherein the difference (H 1 - H 2 ) is 0.5 or more. [4] Capacitor according to one of claims 1 to 3, wherein the HLB value H 1 of the first monomer is in the range of 3.0 to 5.0 and the HLB value H 2 of the second monomer is in the range of 2.0 to 4.

0. [5] A capacitor according to any one of claims 1 to 4, wherein the molar ratio of the first monomer to the second monomer is 10:90 to 90:10, [6] A capacitor according to any one of claims 1 to 5, wherein the first monomer and / or the second monomer has / has an acrylate group or a methacrylate group or the first monomer and / or the second monomer comprises / comprises a monomer having an acrylate group or a methacrylate group. [7] The capacitor according to claim 6, wherein each of the first monomer and the second monomer has an acrylate group or a methacrylate group, or each of the first monomer and the second monomer comprises a monomer having an acrylate group or a methacrylate group. [8] A capacitor according to any one of claims 1 to 7, wherein the first monomer is a bifunctional monomer. [9] Capacitor according to one of claims 1 to 8, wherein the first monomer is tricyclodecane dimethanol diacrylate or tricyclodecane dimethanol dimethacrylate or the first monomer comprises tricyclodecane dimethanol diacrylate or tricyclodecane dimethanol dimethacrylate; and / or the second monomer is 2-(biphenyl-2-yloxy)ethyl acrylate or 4-phenylbenzyl acrylate or the second monomer comprises 2-(biphenyl-2-yloxy)ethyl acrylate or 4-phenylbenzyl acrylate. [10] A capacitor according to any one of claims 1 to 9, wherein in a third polymer part produced by the following production method (2), when subjected to the conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the third polymer part is 0.8% or less, the production method (2) consisting of: Providing the first monomer and the second monomer; Mixing the first monomer and the second monomer in the same ratio as the molar ratio in the resin thin film to obtain a monomer mixture; Mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the monomer mixture to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth. [11] A capacitor according to any one of claims 1 to 10, wherein the capacitor has a relative permittivity of 2.0 or more as measured at 25°C and 1 kHz and a tan δ of less than 1.0% as measured at 25°C and 1 kHz. [12] A method for producing a thin-film polymer laminated capacitor having a structure in which resin thin films and internal electrode metal layers are alternately laminated, the method comprising: Curing a first monomer formed as a polyfunctional monomer and a monomer layer comprising a second monomer formed as a monofunctional monomer to form the resin thin film; and wherein the first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) an HLB value H 2 of the second monomer is less than an HLB value H 1 of the first monomer, (b) when a first polymer part formed using only the first monomer as a monomer and a second polymer part formed using only the second monomer as a monomer are produced by the following production method (1), and a water absorption rate is measured for each of the polymer parts after being subjected to conditions of 40 °C and 95% relative humidity for 40 hours, the water absorption rate of the second polymer part is smaller than the water absorption rate of the first polymer part, the production method (1) consisting in: Providing the first monomer or the second monomer as a test monomer; mixing a photoinitiator in a ratio of 0.2 ± 0.01 mol with 100 mol of the test monomer to obtain a mixture; Pour the mixture into a round bowl; and Irradiating the mixture poured into the round shell with UV rays in a nitrogen atmosphere at 120 W and a distance of 250 mm until polymerization stops, to produce a disc-shaped polymer part with dimensions of 30 mm diameter × 1 mm depth.

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