Thin-film polymer laminated capacitor and method for manufacturing same

Abstract

The present invention relates to a thin film polymer laminated capacitor having a structure in which resin thin film layers and internal electrode metal layers are alternately laminated, the resin thin film layers having a polymer structure in which a first monomer belonging to a polyfunctional monomer and a second monomer belonging to a monofunctional monomer are polymerized, the first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) the HLB value H2 of the second monomer is less than the HLB value H1 of the first monomer; (b) A first polymer member formed using only a first monomer as a monomer and a second polymer member formed using only a second monomer as a monomer are manufactured according to the following manufacturing method (1), and when the water absorption rate of each polymer member is measured by standing for 40 hours under conditions of 40 DEG C and 95% relative humidity, the water absorption rate of each polymer member is less than or equal to 90%. The water absorption rate of the second polymer part is smaller than that of the first polymer part, and the manufacturing method (1) comprises the following steps: providing a first monomer or a second monomer as a test monomer; mixing the photoinitiator at a ratio of 0.2 + / -0.01 moles with respect to 100 moles of the test monomer, thereby obtaining a mixture; injecting the mixture into a disc; and subjecting the mixture injected into the disk to UV irradiation in a nitrogen atmosphere under conditions of 120 W and a distance of 250 mm until polymerization is no longer performed, thereby producing a disk-shaped polymer member having a diameter of 30 mm and a depth of 1 mm.

Description

Technical Field

[0001] The present invention relates to a thin film polymer stacked capacitor and a method for manufacturing the same. Background Art

[0002] As a capacitor, a capacitor having a structure in which dielectric layers made of resin and electrode layers made of metal are alternately stacked is known.

[0003] Patent document 1 describes a thin film polymer laminated film capacitor and a method for manufacturing the same. The document describes a method for manufacturing a thin film polymer laminated film capacitor, which includes manufacturing a laminated body in which resin thin film layers and metal thin film layers are alternately laminated on a rotating drum by repeatedly performing the following steps on the rotating drum: the steps are: evaporating a monomer in a vacuum chamber to form a monomer layer, and then irradiating the monomer layer with an electron beam to cure the monomer layer to form a resin thin film layer; and evaporating a metal material to form a metal thin film layer.

[0004] Patent Document 2 discloses a capacitor including two electrodes separated by a dielectric member. The document describes that the dielectric member includes a polymer of a multifunctional acrylate having a specific chemical structure.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: International Publication No. 2015 / 118693

[0008] Patent Document 2: Japanese Patent Application Publication No. 60-157106 Summary of the invention

[0009] Problem that the invention aims to solve

[0010] Conventional thin film polymer stacked capacitors sometimes do not have sufficient performance in terms of durability. In particular, conventional thin film polymer stacked capacitors formed using multifunctional monomers sometimes cannot obtain sufficient durability. In addition, it is difficult to provide a capacitor having good electrical characteristics and sufficient durability in conventional capacitors.

[0011] An object of the present invention is to provide a thin film polymer stack capacitor having electrical properties required as a thin film polymer stack capacitor and having improved durability.

[0012] Solutions for solving problems

[0013] The above-mentioned problems can be solved by the following aspects of the present invention.

[0014] <Aspect 1>

[0015] A thin film polymer laminated capacitor having a structure in which resin film layers and internal electrode metal layers are alternately laminated.

[0016] The resin film layer has a polymer structure formed by polymerizing a first monomer that is a multifunctional monomer and a second monomer that is a monofunctional monomer.

[0017] The first monomer and the second monomer satisfy at least one of the following conditions (a) and (b):

[0018] (a) the HLB value H2 of the second monomer is less than the HLB value H1 of the first monomer;

[0019] (b) a first polymer component formed using only the first monomer as a monomer and a second polymer component formed using only the second monomer as a monomer are produced according to the following production method (1), and when the water absorption of each polymer component is measured after being left to stand for 40 hours under conditions of 40° C. and 95% relative humidity, the water absorption of the second polymer component is smaller than the water absorption of the first polymer component,

[0020] Wherein, the manufacturing method (1) comprises the following steps:

[0021] providing the first monomer or the second monomer as a test monomer;

[0022] mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the test monomer to obtain a mixture;

[0023] injecting the mixture into a disk; and

[0024] The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

[0025] <Aspect 2>

[0026] The capacitor according to aspect 1, wherein a difference (H1-H2) between an HLB value H1 of the first cell and an HLB value H2 of the second cell is greater than or equal to 0.1.

[0027] <Aspect 3>

[0028] The capacitor according to aspect 2, wherein the difference (H1-H2) is greater than or equal to 0.5.

[0029] <Aspect 4>

[0030] The capacitor according to any one of aspects 1 to 3, wherein the HLB value H1 of the first monomer is in the range of 3.0 to 5.0,

[0031] The HLB value H2 of the second monomer is in the range of 2.0 to 4.0.

[0032] <Aspect 5>

[0033] The capacitor according to any one of aspects 1 to 4, wherein a molar ratio of the first monomer to the second monomer is 10:90 to 90:10.

[0034] <Aspect 6>

[0035] The capacitor according to any one of aspects 1 to 5, wherein at least one of the first monomer and the second monomer has an acrylate group or a methacrylate group, or at least one of the first monomer and the second monomer includes a monomer having an acrylate group or a methacrylate group.

[0036] <Aspect 7>

[0037] The capacitor according to aspect 6, wherein:

[0038] The first monomer and the second monomer both have an acrylate group or a methacrylate group, or the first monomer and the second monomer both include a monomer having an acrylate group or a methacrylate group.

[0039] <Aspect 8>

[0040] The capacitor according to any one of aspects 1 to 7, wherein the first monomer is a bifunctional monomer.

[0041] <Aspect 9>

[0042] The capacitor according to any one of aspects 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,

[0043] and / or

[0044] The second monomer is 2-(biphenyl-2-yloxy)-ethyl acrylate or 4-phenylbenzyl acrylate, or the second monomer includes 2-(biphenyl-2-yloxy)-ethyl acrylate or 4-phenylbenzyl acrylate.

[0045] <Aspect 10>

[0046] The capacitor according to any one of aspects 1 to 9, wherein the water absorption of the third polymer component manufactured by the manufacturing method (2) described below when left to stand for 40 hours under conditions of 40° C. and 95% relative humidity is 0.8% or less,

[0047] Wherein, the manufacturing method (2) comprises the following steps:

[0048] providing the first monomer and the second monomer;

[0049] Mixing the first monomer and the second monomer in the same molar ratio as in the resin film layer to obtain a monomer mixture;

[0050] mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the monomer mixture to obtain a mixture;

[0051] injecting the mixture into a disk; and

[0052] The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

[0053] <Aspect 11>

[0054] The capacitor according to any one of aspects 1 to 10, wherein the capacitor has a relative dielectric constant of 2.0 or more when measured at 25° C. and 1 kHz, and a tan δ of less than 1.0% when measured at 25° C. and 1 kHz.

[0055] <Aspect 12>

[0056] A method for manufacturing a thin film polymer laminated capacitor having a structure in which resin film layers and internal electrode metal layers are alternately laminated.

[0057] The method comprises the steps of curing a monomer layer including a first monomer which is a multifunctional monomer and a second monomer which is a monofunctional monomer to form the resin film layer.

[0058] The first monomer and the second monomer satisfy at least one of the following conditions (a) and (b):

[0059] (a) the HLB value H2 of the second monomer is less than the HLB value H1 of the first monomer;

[0060] (b) a first polymer component formed using only the first monomer as a monomer and a second polymer component formed using only the second monomer as a monomer are produced according to the following production method (1), and when the water absorption of each polymer component is measured after being left to stand for 40 hours under conditions of 40° C. and 95% relative humidity, the water absorption of the second polymer component is smaller than the water absorption of the first polymer component,

[0061] Wherein, the manufacturing method (1) comprises the following steps:

[0062] providing the first monomer or the second monomer as a test monomer;

[0063] mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the test monomer to obtain a mixture;

[0064] injecting the mixture into a disk; and

[0065] The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

[0066] Effects of the Invention

[0067] According to the present invention, it is possible to provide a thin film polymer stacked capacitor having electrical properties required as a thin film polymer stacked capacitor and having improved durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 FIG. 1 is a three-dimensional schematic diagram of a thin film polymer stacked capacitor 1 .

[0069] Figure 2 Graph showing the measurement results of the water absorption rates of the capacitors according to Example 1 and Comparative Example 1. DETAILED DESCRIPTION

[0070] 《Thin Film Polymer Multilayer Capacitors》

[0071] The thin film polymer laminated capacitor disclosed in the present invention has a structure in which resin film layers and internal electrode metal layers are alternately laminated.

[0072] The resin film layer has a polymer structure formed by polymerizing a first monomer which is a multifunctional monomer and a second monomer which is a monofunctional monomer.

[0073] The first monomer and the second monomer satisfy at least one of the following conditions (a) and (b):

[0074] (a) the HLB value H2 of the second monomer is less than the HLB value H1 of the first monomer;

[0075] (b) a first polymer component formed using only a first monomer as a monomer and a second polymer component formed using only a second monomer as a monomer are produced according to the following production method (1), and when the water absorption of each polymer component is measured after being left to stand for 40 hours under conditions of 40° C. and 95% relative humidity, the water absorption of the second polymer component is smaller than the water absorption of the first polymer component,

[0076] The manufacturing method (1) comprises the following steps:

[0077] providing a first monomer or a second monomer as a test monomer;

[0078] mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the test monomer to obtain a mixture;

[0079] injecting the mixture into the disk; and

[0080] The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

[0081] In conventional capacitors, good durability of the capacitors may not be achieved. In particular, in conventional capacitors using polymers formed from multifunctional monomers, although a polymer structure of a resin film layer having a high degree of crosslinking can be achieved, good durability of the capacitors may not be achieved.

[0082] In contrast, according to the present invention, a thin film polymer multilayer capacitor having the performance required as a thin film polymer multilayer capacitor and having improved durability can be provided.

[0083] More specifically, in the capacitor of the present invention satisfying the above-mentioned condition (a), the resin film layer is formed using not only a multifunctional monomer but also a monofunctional monomer having a relatively low HLB value. Although not wishing to be limited by theory, it is believed that in this case, due to the multifunctional monomer, a sufficient degree of crosslinking of the polymer structure in the resin film layer can be ensured, and due to the polymer structural unit derived from the monofunctional monomer having a relatively low HLB value, the water absorption of the resin film layer can be reduced, and as a result, excellent durability can be achieved.

[0084] In addition, in the capacitor of the present invention that satisfies the above condition (b), the resin film layer is formed not only from a multifunctional monomer but also from a monofunctional monomer that forms a polymer having low water absorption. Although not wishing to be limited by theory, it is believed that in this case, due to the multifunctional monomer, a sufficient degree of crosslinking of the polymer structure in the resin film layer can be ensured, and due to the polymer structural unit derived from the monofunctional monomer, the water absorption of the resin film layer can be reduced, and as a result, excellent durability can be achieved.

[0085] Furthermore, although not wishing to be limited by theory, it is believed that when a monofunctional monomer is contained, the curing shrinkage of the resin film layer is suppressed, the generation of internal stress is suppressed, and thus warping and cracking are reduced, and interlayer delamination in the capacitor can be prevented or suppressed. In this case, since water intrusion into the cracked portion or the delaminated portion is suppressed, it is believed that the water absorption rate of the capacitor can also be more effectively suppressed.

[0086] The method involved in the present disclosure will be described in more detail below.

[0087] <First monomer and second monomer>

[0088] The resin film layer has a polymer structure formed by polymerizing a first monomer that is a multifunctional monomer and a second monomer that is a monofunctional monomer. Preferably, among all monomer units constituting the polymer structure of the resin film layer, the proportion of monomer units derived from the first monomer and monomer units derived from the second monomer is 80% or more, 85% or more, 90% or more, or 95% or more, and particularly preferably 100% in terms of molar ratio.

[0089] A polyfunctional monomer has a plurality of (particularly two) polymerizable functional groups in one molecule, and a monofunctional monomer has one polymerizable functional group in one molecule.

[0090] As polymerizable functional groups, vinyl groups (particularly acryloyl groups, methacryloyl groups, acrylate groups, methacrylate groups), acrylonitrile groups, and epoxy groups can be cited. Preferably, the multifunctional monomer and / or monofunctional monomer has at least one of an acrylate group and a methacrylate group. Most preferably, both the multifunctional monomer and the monofunctional monomer have an acrylate group. It should be noted that the monomer having an acrylate group is an acrylate monomer, and the monomer having a methacrylate group is a methacrylate monomer.

[0091] The polyfunctional monomer and the monofunctional monomer can be polymerized to form a polymer through the polymerizable functional group under conditions such as electron beam irradiation.

[0092] The ratio of the first monomer to the second monomer, that is, the ratio of the polyfunctional monomer to the monofunctional monomer, can be appropriately set according to the desired characteristics of the capacitor and the like.

[0093] The molar ratio of the first monomer to the second monomer is preferably 10:90 to 90:10, and more preferably 20:80 to 80:20, 30:70 to 70:30, 40:60 to 60:40, or 45:55 to 55:45.

[0094] In other words, the molar amount of the second monomer is preferably 10 to 90%, 20 to 80%, 30 to 70%, 40 to 60%, or 45 to 55% relative to the total molar amount of the first monomer and the second monomer.

[0095] When the ratio of the first monomer to the second monomer is within the above range, a capacitor having good electrical characteristics and having particularly excellent durability can be provided.

[0096] (Multifunctional monomer)

[0097] The multifunctional monomer is in particular a bifunctional monomer. The multifunctional monomer preferably has an acrylate group or a methacrylate group. The multifunctional monomer most preferably has an acrylate group. In another embodiment, the multifunctional monomer preferably comprises a monomer having an acrylate group or a methacrylate group, or is composed of a monomer having an acrylate group or a methacrylate group. The multifunctional monomer most preferably comprises a monomer having an acrylate group, or is composed of a monomer having an acrylate group.

[0098] In one embodiment of the present disclosure, the multifunctional monomer may have a chemical structure represented by the following general formula (1).

[0099]

[0100] In formula (1),

[0101] R 1 is a group containing 1 to 20 carbon atoms;

[0102] R 2 is H or CH3;

[0103] n is 2 to 4.

[0104] In formula (1), n ​​is preferably 2 to 3, and more preferably n=2.

[0105] In formula (1), R 1 The carbon atoms are preferably 3 to 20, more preferably 6 to 20, and even more preferably 8 to 20.

[0106] R in formula (1) 1 may contain oxygen atoms. In this case, R 1It may contain 1 to 20, 1 to 10, 1 to 5, 1 to 3, or 1 to 2 oxygen atoms, or may contain 1 oxygen atom.

[0107] R in formula (1) 1 In particular, ether bonds may be present. In this case, R 1 It may contain 1 to 20, 1 to 10, 1 to 5, 1 to 3, or 1 to 2 ether bonds, or may contain 1 ether bond.

[0108] Preferably, R in formula (1) 1 It is composed of carbon atoms, hydrogen atoms and optionally oxygen atoms.

[0109] In formula (1), R 1 It may contain aliphatic moieties (linear or branched), alicyclic moieties and / or aromatic moieties.

[0110] When R in formula (1) 1 When an alicyclic portion is included, the molar volume increases due to the increased steric hindrance of the molecule, which can have the effect of reducing the tanδ of the capacitor. In addition, due to the steric hindrance and rigidity, the micro-Brownian motion of the main chain segments in the three-dimensional network structure of the polymer due to the increase in temperature is suppressed, and as a result, a capacitor with a higher glass transition temperature and excellent heat resistance can be obtained. Furthermore, since the curing shrinkage of the resin film layer is relatively suppressed, the interlayer adhesion of the capacitor can be further improved.

[0111] When R in formula (1) 1 When an aromatic moiety is included, the polarization caused by the dipole orientation is larger than that of a simple alkyl skeleton due to the π-electron conjugated system, and a larger dielectric constant can be obtained. 1 When a large steric structure such as a biphenyl structure is included, it can have the effect of reducing the tan δ of the capacitor as described above with respect to the alicyclic portion. Furthermore, since the curing shrinkage of the resin film layer is relatively suppressed, the interlayer adhesion of the capacitor can be further improved.

[0112] In formula (1), R 1 It is preferable that no unsaturated bond is contained. By not containing an unsaturated bond, an increase in tan δ of the capacitor can be suppressed in some cases.

[0113] Examples of the compound structures M1 to M6 of the polyfunctional monomers that can be used in the present invention are shown below.

[0114]

[0115] In the chemical formulae M3 and M4, n may be 1 to 20, preferably 5 to 18, more preferably 8 to 15, and further preferably 9 to 12, respectively.

[0116] In the chemical formulas M5 and M6, n may be 1 to 20, preferably 1 to 10, more preferably 2 to 6, and further preferably 3 to 4.

[0117] Examples of preferred compound structures of the polyfunctional monomers are shown below.

[0118]

[0119] Particularly preferred polyfunctional monomers include

[0120] Tricyclodecane dimethanol diacrylate,

[0121] Tricyclodecane dimethanol dimethacrylate,

[0122] 1,12-Dodecanediol dimethacrylate,

[0123] 1,12-Dodecanediol diacrylate,

[0124] α,α'-[Propane-2,2-diylbis-(4,1-phenylene)]bis[ω-(acryloyloxy)poly(ethylene oxide)].

[0125] (Monofunctional monomer)

[0126] The monofunctional monomer preferably has an acrylate group or a methacrylate group. The monofunctional monomer most preferably has an acrylate group. In another embodiment, the monofunctional monomer preferably comprises a monomer having an acrylate group or a methacrylate group, or is composed of a monomer having an acrylate group or a methacrylate group. The monofunctional monomer most preferably comprises a monomer having an acrylate group, or is composed of a monomer having an acrylate group.

[0127] In one embodiment of the present disclosure, the monofunctional monomer may have a chemical structure represented by the following general formula (2).

[0128]

[0129] In formula (2),

[0130] R 3 is a group containing 1 to 20 carbon atoms;

[0131] R 2 It is H or CH3.

[0132] R in formula (2) 2 Preferably H.

[0133] R in formula (2) 3 The carbon atoms are preferably 3 to 20, more preferably 6 to 20, and even more preferably 8 to 20.

[0134] R in formula (2) 3 may contain oxygen atoms. In this case, R 3 It may contain 1 to 20, 1 to 10, 1 to 5, 1 to 3, 1 to 2, or 1 oxygen atom.

[0135] R in formula (2) 3 In particular, ether bonds may be present. In this case, R 3 It may contain 1 to 20, 1 to 10, 1 to 5, 1 to 3, 1 to 2, or 1 ether bond.

[0136] Preferably, R in formula (2) 3 It is composed of carbon atoms, hydrogen atoms and optionally oxygen atoms.

[0137] In formula (2), R 3 It may contain aliphatic moieties (linear or branched), alicyclic moieties and / or aromatic moieties.

[0138] When R in formula (2) 3 When an alicyclic portion is included, the molar volume increases due to the increased steric hindrance of the molecule, which can have the effect of reducing the tanδ of the capacitor. In addition, due to the steric hindrance and rigidity, the micro-Brownian motion of the main chain segments in the three-dimensional network structure of the polymer due to the increase in temperature is suppressed, and as a result, a capacitor with a higher glass transition temperature and excellent heat resistance can be obtained. Furthermore, since the curing shrinkage of the resin film layer is relatively suppressed, the interlayer adhesion of the capacitor can be further improved.

[0139] When R in formula (2) 3 When an aromatic moiety is included, the polarization caused by the dipole orientation is larger than that of a simple alkyl skeleton due to the π-electron conjugated system, and a larger dielectric constant can be obtained. 3 When a large steric structure such as a biphenyl structure is included, it can have the effect of reducing tanδ of the capacitor as described above with respect to the alicyclic portion. Furthermore, since the curing shrinkage of the resin film layer is relatively suppressed, the interlayer adhesion of the capacitor can be further improved.

[0140] R 3 A biphenyl structure is particularly preferred.

[0141] In formula (2), R 3 It is preferable that no unsaturated bond is contained. By not containing an unsaturated bond, an increase in tan δ of the capacitor can be suppressed in some cases.

[0142] Examples of the compound structures of the monofunctional monomers that can be used in the present invention are shown below: S1 to S8 and S'1 to S'4.

[0143]

[0144]

[0145] In the chemical formulae S1 and S2 and S′1 and S′2, n may be 0 to 20, preferably 1 to 10, more preferably 1 to 5, further preferably 1 to 3 or 1 to 2, and most preferably n=1.

[0146] In the chemical formulae S5 and S6, n may be 1 to 20, preferably 5 to 18, and more preferably 12 to 16, respectively.

[0147] In the chemical formulae S7 and S8, n may be 1 to 20, preferably 10 to 20, more preferably 12 to 18, and further preferably 14 to 16, respectively.

[0148] Examples of preferred compound structures of monofunctional monomers are shown below.

[0149]

[0150] Particularly preferred monofunctional monomers include:

[0151] 2-(Biphenyl-2-yloxy)-ethyl acrylate,

[0152] 4-Phenylbenzyl acrylate,

[0153] 2-[(tricyclo[5.2.1.0(2,6)]dec-4-en-9-yl)oxy]ethyl acrylate,

[0154] 2-[(Tricyclo[5.2.1.0(2,6)]dec-4-en-9-yl)oxy]ethyl methacrylate.

[0155] Particularly preferred combinations of the first monomer and the second monomer include the following (1) and (2):

[0156] (1) a combination of tricyclodecane dimethanol diacrylate and 2-(biphenyl-2-yloxy)-ethyl acrylate;

[0157] (2) Combination of tricyclodecane dimethanol diacrylate and 4-phenylbenzyl acrylate.

[0158] In one embodiment of the present invention, at least either one of the first monomer and the second monomer has an acrylate group or a methacrylate group (i.e., an acrylate monomer or a methacrylate monomer), or at least either one of the first monomer and the second monomer contains a monomer having an acrylate group or a methacrylate group (i.e., an acrylate monomer or a methacrylate monomer).

[0159] In one embodiment of the present invention, the first monomer and the second monomer both have an acrylate group or a methacrylate group (i.e., an acrylate monomer or a methacrylate monomer), or the first monomer and the second monomer both contain a monomer having an acrylate group or a methacrylate group (i.e., an acrylate monomer or a methacrylate monomer).

[0160] In one embodiment of the present invention, the first monomer is tricyclodecane dimethanol diacrylate or tricyclodecane dimethanol dimethacrylate, or the first monomer comprises tricyclodecane dimethanol diacrylate or tricyclodecane dimethanol dimethacrylate.

[0161] and / or

[0162] The second monomer is or comprises 2-(biphenyl-2-yloxy)-ethyl acrylate or 4-phenylbenzyl acrylate.

[0163] <HLB value>

[0164] In one embodiment of the present disclosure, the capacitor of the present invention satisfies the above condition (a), that is, the HLB value H2 of the second monomer, which is a monofunctional monomer, is smaller than the HLB value H1 of the first monomer, which is a polyfunctional monomer.

[0165] The HLB value is an index indicating the degree of affinity for water and oil, and is calculated based on the type of functional groups constituting the monomer. The trend is that the higher the HLB value, the higher the hydrophilicity of the monomer. The HLB value can be calculated according to the Davis method.

[0166] The difference (H1-H2) between the HLB value H1 of the first monomer and the HLB value H2 of the second monomer is preferably 0.1 or more. The difference (H1-H2) is more preferably 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.

[0167] The HLB value H1 of the first monomer is preferably in the range of 3.0 to 5.0. The range is more preferably 3.1 or more, 3.2 or more, 3.3 or more, 3.4 or more, 3.5 or more, 3.6 or more, 3.7 or more, 3.8 or more, 3.9 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.

[0168] In addition, the HLB value H2 of the second monomer is preferably in the range of 2.0 to 4.0. This range is more preferably 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 3.9 or less, 3.8 or less, 3.7 or less, 3.6 or less, 3.5 or less, 3.4 or less, 3.3 or less, or 3.2 or less.

[0169] The HLB value H1 of the first monomer and the HLB value H2 of the second monomer can be calculated based on the Davis method.

[0170] As examples, HLB values ​​calculated based on the Davis method for some representative multifunctional monomers and monofunctional monomers are listed in the following Table 1.

[0171] [Table 1-1]

[0172] Table 1

[0173]

[0174] [Table 1-2]

[0175] (Table 1 continued)

[0176]

[0177] (Calculation method of HLB value based on Davis method)

[0178] The HLB value can be calculated according to the Davis method using the following formula (A): HLB value = 7 + Σ (number of hydrophilic groups) + Σ (number of lipophilic groups) (A) The number of main hydrophilic groups is as follows:

[0179] Ester group (-COO-) 2.4

[0180] Hydroxyl (-OH) 1.9

[0181] Ether group (-O-) 1.3

[0182] (-CH2CH2O-) 0.33

[0183] The base numbers of the main lipophilic groups are as follows:

[0184] Alkanes (-CH2-) -0.475

[0185] Methyl (-CH3) -0.475

[0186] Olefin (-CH=) -0.475

[0187] (-CH2CH(CH3)O-) -0.15

[0188] For example in the case of tricyclodecane dimethanol dimethacrylate:

[0189] According to ester group 2

[0190] Alkane 12

[0191] Olefin 2×2

[0192] Methyl 2,

[0193] Based on the above base numbers, we can calculate:

[0194] HLB value = 3.25 (about 3.3).

[0195] It should be noted that the ring structure in the molecular structure of tricyclodecane dimethanol dimethacrylate and the methylene group directly bonded thereto are both regarded as alkanes (the ring structure is composed of 10 alkanes in total).

[0196] In addition, for example, in the case of 2-(biphenyl-2-yloxy)-ethyl acrylate:

[0197] According to the ester group 1

[0198] Olefin 2+6×2

[0199] (-CH2CH2O-) 1,

[0200] Based on the above base numbers, we can calculate:

[0201] HLB value = 3.08 (about 3.1).

[0202] It should be noted that the two benzene rings in the molecular structure of 2-(biphenyl-2-yloxy)-ethyl acrylate are considered to be composed of six olefins respectively.

[0203] <Water absorption>

[0204] In another embodiment of the present disclosure, the capacitor of the present invention satisfies the condition (b) above, that is, a first polymer component formed by using only a first monomer as a monomer and a second polymer component formed by using only a second monomer as a monomer are manufactured according to the manufacturing method (1) above, and when the water absorption of each polymer component is measured by standing for 40 hours under the conditions of 40° C. and 95% relative humidity, the water absorption of the second polymer component is less than the water absorption of the first polymer component.

[0205] The difference between the water absorption rate (%) of the second polymer component and the water absorption rate (%) of the first polymer component may be 0.05 or more. The difference is preferably 0.1 or more, 0.2 or more, or 0.3 or more. The upper limit of the difference is not particularly limited, and may be 2.0 or less, for example.

[0206] The water absorption of the first polymer component may be 0.5% to 2.0%, preferably 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.

[0207] The water absorption of the second polymer component may be 0.1% to 1.0%. The water absorption of the first polymer component is preferably 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.

[0208] The water absorption rate of the first polymer member and the second polymer member can be calculated from the weight change rate of the polymer member when a moisture absorption test is performed in which the polymer member to be measured is left to stand at 40° C. and 95% relative humidity for 40 hours.

[0209] That is, the weight change rate (%) can be calculated based on the weight value of the polymer component before the moisture absorption test and the weight of the polymer component immediately after the moisture absorption test, and this can be used as the water absorption rate. In particular, the weight change rate (%) can be calculated according to the following formula:

[0210] Weight change rate (%) = 100 × (weight after moisture absorption test - weight before moisture absorption test) / weight before moisture absorption test.

[0211] <Method for producing first and second polymer components>

[0212] The first polymer member and the second polymer member for measuring water absorption are manufactured according to the manufacturing method (1).

[0213] The manufacturing method (1) comprises the following steps:

[0214] providing a first monomer or a second monomer as a test monomer;

[0215] mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the test monomer to obtain a mixture;

[0216] injecting the mixture into the disk; and

[0217] The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

[0218] Regarding the first monomer or the second monomer provided as a test monomer, the above description can be referred to.

[0219] The photoinitiator can be appropriately set according to the type of the test monomer. As a specific photoinitiator, 2-benzyl-2-dimethylamino-4'morpholinophenylbutanone can be cited. The test monomer and the photoinitiator can be mixed according to a known method.

[0220] The disc has such a size that when the mixture placed therein is polymerized by UV irradiation, a disc-shaped polymer component having a size of 30 mm in diameter x 1 mm in depth can be produced. Specifically, for example, the disc may be a disc having a planar area of ​​30 mm in inner diameter and a depth of 1 to 5 cm, and the mixture may be injected into the disc so that its height is 1 mm.

[0221] UV irradiation was performed to promote polymerization of the test monomers at an intensity of 120 W and a distance of 250 mm from the sample.

[0222] The irradiation time of UV irradiation is determined according to the type of test monomer, in particular, in order to allow the polymerization of the test monomer (i.e., the curing of the mixture) to proceed fully, and in a manner that the polymerization is no longer promoted even if further UV irradiation is performed. Those skilled in the art can determine the irradiation time of UV irradiation according to the type of test monomer. For example, when the test monomer is an acrylate monomer (a monomer having an acrylate group), 60 seconds of UV irradiation can be performed. In addition, for example, when the test monomer is a methacrylate monomer (a monomer having a methacrylate group), 360 seconds of UV irradiation can be performed. When the test monomer has an acrylate group and a methacrylate group, 360 seconds of UV irradiation can be performed.

[0223] <Thin-film polymer multilayer capacitor>

[0224] The thin film polymer multilayer capacitor according to the present disclosure has a structure in which resin thin film layers and internal electrode metal layers are alternately stacked.

[0225] Figure 1 1 is a schematic perspective view of a thin film polymer laminate capacitor 1. The thin film polymer laminate capacitor 1 includes a laminate 2 in which resin thin film layers and metal thin film layers (internal electrode metal layers) are alternately laminated, and two external electrodes 3 and 4 are attached to the laminate 2.

[0226] The thin film polymer multilayer capacitor may have 10 to 10,000 layers, 50 to 5,000 layers, or 100 to 2,000 layers.

[0227] The resin thin film layer may have a thickness of 10 nm to 3000 nm, and preferably has a thickness of 100 to 1500 nm.

[0228] Examples of the metal material constituting the internal electrode metal layer include at least one selected from the group consisting of Al, Cu, Zn, Sn, Au, Ag, Pt, and combinations thereof.

[0229] The internal electrode metal layer may have a thickness of 1 nm to 100 nm, preferably 10 to 40 nm. In addition, the metal thin film layer preferably has a vapor deposition resistance value of 1 to 50 Ω / □, 5 to 40 Ω / □, or 5 to 30 Ω / □.

[0230] (Relative dielectric constant)

[0231] The capacitor of the present disclosure preferably has a relative dielectric constant of 2.0 or more when measured at 25° C. and 1 kHz. The relative dielectric constant is more preferably 2.1 or more, 2.2 or more, 2.3 or more, or 2.5 or more. The upper limit of the relative dielectric constant is not particularly limited and may be 5.0 or less.

[0232] The relative dielectric constant at 25° C. and 1 kHz can be calculated based on the electrostatic capacitance measured using an LCR meter, the electrode area, and the thickness of the dielectric.

[0233] (tanδ)

[0234] In addition, the capacitors disclosed herein preferably have a tanδ (also referred to as dielectric loss tangent or loss coefficient) of less than 1.0% when measured at 25°C and 1kHz. The tanδ is more preferably 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 the tanδ is not particularly limited and may be 0.05% or more.

[0235] In addition, the capacitor of the present disclosure preferably has a tanδ of less than 0.01 when measured at 25°C and 1kHz. The tanδ is more preferably 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 the tanδ is not particularly limited and may be 0.0005 or more.

[0236] Tanδ at 25°C and 1kHz can be measured using an LCR meter.

[0237] (Water absorption rate of capacitor)

[0238] For the capacitor, the third polymer member produced by the following production method (2) preferably has a water absorption of 0.8% or less when left to stand at 40° C. and 95% relative humidity for 40 hours.

[0239] The water absorption of the third polymer component is preferably 0.7% or less, 0.6% or less, 0.5% or less, or 0.4% or less. The lower limit of the water absorption of the third polymer component is not particularly limited, and may be, for example, 0.01% or more.

[0240] (Manufacturing method (2): Method for manufacturing the third polymer component)

[0241] The manufacturing method (2) for manufacturing the third polymer component comprises the following steps:

[0242] providing a first monomer and a second monomer;

[0243] mixing the first monomer and the second monomer in the same molar ratio as in the resin film layer to obtain a monomer mixture;

[0244] mixing a photoinitiator in a ratio of 0.2±0.01 mol relative to 100 mol of the monomer mixture to obtain a mixture;

[0245] injecting the mixture into the disk; and

[0246] The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

[0247] For details of the production method (2) for producing the third polymer component, reference can be made to the above description regarding the production method (1).

[0248] <Capacitor Manufacturing Method>

[0249] The method for producing the thin film polymer multilayer capacitor according to the present disclosure is not particularly limited.

[0250] For example, the thin film polymer stacked capacitor involved in the present disclosure can be manufactured by a method including the following steps: alternatingly repeating the step of forming a resin thin film layer in a vacuum chamber and the step of evaporating a metal material to form a metal thin film layer on a rotating drum, thereby manufacturing a stacked body in which resin thin film layers and metal thin film layers are alternately stacked on a rotating drum.

[0251] As a method for alternately laminating the resin thin film layer and the metal thin film layer on the rotating drum, a known method can be used, for example, the method described in International Publication No. 2015 / 118693 can be used.

[0252] The laminate formed on the rotating drum can be removed from the rotating drum and pressed under heating to be flat. Then, the flat laminate is cut into rods, external electrodes are formed, and the flat laminate is further cut into chips to obtain a thin film polymer laminate capacitor.

[0253] The thin film polymer multilayer capacitor according to the present disclosure is preferably produced by the following production method according to the present disclosure.

[0254] (Method for manufacturing capacitor according to the present invention)

[0255] A method for manufacturing a thin film polymer laminated capacitor having a structure in which resin film layers and internal electrode metal layers are alternately laminated.

[0256] The method comprises the steps of curing a monomer layer including a first monomer which is a multifunctional monomer and a second monomer which is a monofunctional monomer to form a resin film layer.

[0257] The first monomer and the second monomer satisfy at least one of the following conditions (a) and (b):

[0258] (a) the HLB value H2 of the second monomer is less than the HLB value H1 of the first monomer;

[0259] (b) a first polymer component formed using only a first monomer as a monomer and a second polymer component formed using only a second monomer as a monomer are produced according to the following production method (1), and when the water absorption of each polymer component is measured after being left to stand for 40 hours under conditions of 40° C. and 95% relative humidity, the water absorption of the second polymer component is smaller than the water absorption of the first polymer component,

[0260] The manufacturing method (1) comprises the following steps:

[0261] providing a first monomer or a second monomer as a test monomer;

[0262] mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the test monomer to obtain a mixture;

[0263] injecting the mixture into the disk; and

[0264] The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

[0265] For details of the manufacturing method of the present disclosure, reference may be made to the above description of the capacitor of the present disclosure. In particular, for manufacturing method (1), conditions (a) and conditions (b), reference may be made to the above description of the capacitor of the present disclosure.

[0266] The "curing treatment" when forming the resin film layer can be performed according to a known method, for example, according to the method described in International Publication No. 2015 / 118693. Specifically, for example, after a monomer is evaporated in a vacuum chamber to form a monomer layer, the monomer layer can be irradiated with an electron beam to cure the monomer layer.

[0267] Example

[0268] Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is not limited to the Examples.

[0269] 《Reference Examples 1 to 3》

[0270] (Water absorption test)

[0271] In Reference Examples 1 to 3, the water absorption properties of the monomers shown in Table 2 below were evaluated using polymer blocks (polymer parts).

[0272] <Reference Example 1>

[0273] In Reference Example 1, tricyclodecane dimethanol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: A-DCP) as a bifunctional monomer was used as a test monomer to prepare a polymer part as follows:

[0274] Tricyclodecane dimethanol diacrylate was provided as a test monomer,

[0275] A photoinitiator (2-benzyl-2-dimethylamino-4'-morpholinophenylbutanone, manufactured by Tokyo Chemical Industry Co., Ltd.) was mixed at a ratio of 0.2±0.01 mol to 100 mol of the test monomer to form a mixture.

[0276] The mixture is poured into the disk and

[0277] The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

[0278] Since the test monomer of Reference Example 1 is a monomer having an acrylate group, the mixture was irradiated with UV for 60 seconds to allow polymerization (ie, curing) to proceed sufficiently. Even if some defects were generated in the polymer, they were used as they were for water absorption evaluation.

[0279] The obtained polymer parts were subjected to a hygroscopicity test. Specifically, the polymer parts were placed in a constant temperature and humidity chamber set at 40°C and 95% relative humidity and left to stand for 40 hours. Then, the weight change rate before and after the hygroscopicity test was measured and used as the water absorption rate. The results are shown in Table 2 below.

[0280] <Reference Example 2>

[0281] In Reference Example 2, the water absorption test of the 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 Industry Co., Ltd., product name: A-LEN-10), which is a monofunctional monomer, was used as the test monomer instead of tricyclodecane dimethanol diacrylate. The results are shown in Table 2 below. It should be noted that the test monomer of Reference Example 2 is a monomer having an acrylate group.

[0282] <Reference Example 3>

[0283] In Reference Example 3, a 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 a test monomer. The results are shown in Table 2 below.

[0284] [Table 2]

[0285] Table 2

[0286]

[0287] As shown in Table 2, the polymer component formed from 2-(biphenyl-2-yloxy)-ethyl acrylate (Reference Example 2) exhibited lower water absorption than the polymer component formed from tricyclodecane dimethanol diacrylate (Reference Example 1).

[0288] Furthermore, as shown in Table 2, the polymer component formed from a mixture of tricyclodecane dimethanol diacrylate and 2-(biphenyl-2-yloxy)-ethyl acrylate (Reference Example 3) exhibited lower water absorption than the polymer component formed from tricyclodecane dimethanol diacrylate alone (Reference Example 1).

[0289] These results indicate that by combining a polyfunctional monomer showing a higher water absorption when measured as a polymer part with a monofunctional monomer showing a lower water absorption when measured as a polymer part, the water absorption of the resulting polymer can be reduced as a result.

[0290] In addition, Table 2 also shows the HLB value calculated according to the Davis method for each monomer. As shown in Table 2, when calculated according to the Davis method, the HLB value of 2-(biphenyl-2-yloxy)-ethyl acrylate, which is a monofunctional monomer, is 3.1, and the HLB value of tricyclodecane dimethanol diacrylate, which is a bifunctional monomer, is 4.2. That is, 2-(biphenyl-2-yloxy)-ethyl acrylate has a smaller HLB value than tricyclodecane dimethanol diacrylate. The results of Table 2 show that there is a correlation between the HLB value of the monomer and the water absorption rate when measured with a polymer part.

[0291] 《Example 1 and Comparative Example 1》

[0292] In Example 1 and Comparative Example 1, capacitors having a resin film layer formed of the monomer or monomer mixture shown in Table 3 below were produced and evaluated for durability.

[0293] <Example 1>

[0294] (Manufacturing of Thin Film Polymer Multilayer Capacitors)

[0295] The steps of forming a resin thin film layer in a vacuum chamber and forming a metal thin film layer were repeated alternately on a rotating drum, thereby manufacturing a laminated body in which a total of 2550 resin thin film layers and metal thin film layers (internal electrode metal layers) were alternately stacked on a rotating drum.

[0296] In the process of forming the resin thin film layer, the resin thin film layer is formed from a monomer mixture containing tricyclodecane dimethanol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: A-DCP) as a bifunctional monomer and 2-(biphenyl-2-yloxy)-ethyl acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name: A-LEN-10) as a monofunctional monomer in a molar ratio of 50:50. That is, after the monomer mixture is evaporated in a vacuum chamber to form a monomer layer, the monomer layer is irradiated with an electron beam to cure the monomer layer, thereby forming the resin thin film layer. The electron beam irradiation is performed under the conditions of an acceleration voltage of 5.0 kV and an irradiation current of 50 mA. The thickness of the resin thin film layer is 0.5 μm.

[0297] In the step of forming the metal thin film layer, aluminum (Al) as a metal material is vapor-deposited on the resin thin film layer partially masked by vapor coating of fluorine oil to form the metal thin film layer. The vapor deposition resistance value of the metal thin film layer is 10Ω / □.

[0298] The manufactured laminated body was removed from the rotating drum and pressed to be flattened under heating at 160°C. Then, the flat laminated body was cut into a rod shape, external electrodes (sprayed material of brass spraying, copper plating and tin plating) were attached, and it was further cut into a chip shape to obtain the thin film polymer laminated capacitor involved in Example 1. The size of the capacitor was 4.5 mm×3.2 mm.

[0299] (Humidity resistance environment evaluation test)

[0300] The durability of the capacitor of Example 1 was evaluated by a humidity test. In the humidity test, the capacitor was placed in a constant temperature and humidity chamber at 60°C and 90% relative humidity and allowed to stand for 1000 hours with a 50V DC voltage applied.

[0301] Before and after the humidity test, tanδ (dielectric loss tangent) and capacitance were measured. Tanδ was measured using an LCR tester at 25°C and 1kHz. The capacitance (μF) of the capacitor was measured using an LCR tester at 25°C and 1kHz. The results are shown in Table 3 below.

[0302] (Evaluation of water absorption of capacitors)

[0303] In Example 1, the water absorption of the capacitor was further evaluated according to the following water absorption test.

[0304] Specifically, the capacitor was placed in a constant temperature and humidity chamber at 40°C and 95% relative humidity, and the weight change rate of the capacitor after standing for a specified time was measured and used as the water absorption rate of the capacitor. The results are shown in Table 3 and Figure 2 shown.

[0305] In Table 3 below, the water absorption of the capacitors was evaluated according to the following criteria:

[0306] 0: The water absorption rate measured after 500 hours of the above water absorption test is less than 1%.

[0307] ×: The water absorption rate measured after the above water absorption test for 500 hours was 1% or more.

[0308] <Comparative Example 1>

[0309] In Comparative Example 1, capacitors were manufactured and evaluated in the same manner as in Example 1 except that only tricyclodecane dimethanol diacrylate (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: A-DCP) as a bifunctional monomer was used instead of the monomer mixture. The results are shown in Tables 3 and 4. Figure 2 shown.

[0310] [Table 3]

[0311] Table 3

[0312]

[0313] As shown in Table 3, regarding initial characteristics, the capacitors of Example 1 and Comparative Example 1 both exhibited good initial capacitance characteristics (μF). In addition, the initial tan δ value of Example 1 was better than that of Comparative Example 1.

[0314] On the other hand, regarding the characteristics after the humidity environment evaluation test, the capacitor of Comparative Example 1 produced using only tricyclodecane dimethanol diacrylate as a bifunctional monomer showed a decrease in performance, specifically, an increase in tan δ and a decrease in capacitance (ΔC<0) were observed.

[0315] In contrast, the capacitor of Example 1 maintained a good tan δ even after the humidity resistance environment evaluation test, and no decrease in capacitance was observed (ΔC>0).

[0316] In addition, as shown in Table 3 and Figure 2 As shown, the capacitor involved in Example 1 exhibits better water absorption (relatively reduced water absorption) than the capacitor involved in Comparative Example 1.

[0317] From the above results, it can be seen that by combining a polyfunctional monomer and a monofunctional monomer having a specific HLB value, or by combining a polyfunctional monomer and a monofunctional monomer having a specific water absorption rate when measured with a polymer component, a thin film polymer stacked capacitor having good electrical properties and excellent durability can be provided. Although not wishing to be limited by theory, it is believed that in such a capacitor, by using a polyfunctional monomer, a sufficient degree of crosslinking of the polymer structure in the resin film layer can be ensured, and by using a monofunctional monomer that brings a polymer with lower water absorption, the water absorption of the capacitor is reduced, and as a result, good electrical characteristics and excellent durability of the capacitor can be achieved.

Claims

1. A thin film polymer laminate capacitor having a structure in which resin film layers and internal electrode metal layers are alternately laminated, The resin film layer has a polymer structure formed by polymerizing a first monomer that is a multifunctional monomer and a second monomer that is a monofunctional monomer. The first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) the HLB value H2 of the second monomer is less than the HLB value H1 of the first monomer; (b) a first polymer component formed using only the first monomer as a monomer and a second polymer component formed using only the second monomer as a monomer are produced according to the following production method (1), and when the water absorption of each polymer component is measured after being left to stand for 40 hours under conditions of 40° C. and 95% relative humidity, the water absorption of the second polymer component is smaller than the water absorption of the first polymer component, in, The manufacturing method (1) comprises the following steps: providing the first monomer or the second monomer as a test monomer; mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the test monomer to obtain a mixture; injecting the mixture into a disk; as well as The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

2. The capacitor according to claim 1, wherein: A difference (H1-H2) between an HLB value H1 of the first monomer and an HLB value H2 of the second monomer is greater than or equal to 0.

1.

3. The capacitor according to claim 2, wherein: The difference (H1-H2) is greater than 0.

5.

4. The capacitor according to any one of claims 1 to 3, wherein: The HLB value H1 of the first monomer is in the range of 3.0 to 5.0, The HLB value H2 of the second monomer is in the range of 2.0 to 4.

0.

5. The 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. The capacitor according to any one of claims 1 to 5, wherein: At least one of the first monomer and the second monomer has an acrylate group or a methacrylate group, or at least one of the first monomer and the second monomer includes a monomer having an acrylate group or a methacrylate group.

7. The capacitor according to claim 6, wherein: The first monomer and the second monomer both have an acrylate group or a methacrylate group, or the first monomer and the second monomer both include a monomer having an acrylate group or a methacrylate group.

8. The capacitor according to any one of claims 1 to 7, wherein: The first monomer is a bifunctional monomer.

9. The capacitor according to any 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 includes 2-(biphenyl-2-yloxy)-ethyl acrylate or 4-phenylbenzyl acrylate.

10. The capacitor according to any one of claims 1 to 9, wherein: The third polymer component manufactured by the manufacturing method (2) below has a water absorption rate of 0.8% or less when left to stand for 40 hours under conditions of 40° C. and 95% relative humidity. Wherein, the manufacturing method (2) comprises the following steps: providing the first monomer and the second monomer; Mixing the first monomer and the second monomer in the same molar ratio as in the resin film layer to obtain a monomer mixture; mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the monomer mixture to obtain a mixture; injecting the mixture into a disk; and The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

11. The capacitor according to any one of claims 1 to 10, wherein: The capacitor has a relative dielectric constant of 2.0 or more when measured at 25° C. and 1 kHz and a tan δ of less than 1.0% when measured at 25° C. and 1 kHz.

12. A method for manufacturing a thin film polymer laminated capacitor, the thin film polymer laminated capacitor having a structure in which resin film layers and internal electrode metal layers are alternately laminated, The method comprises the steps of curing a monomer layer including a first monomer which is a multifunctional monomer and a second monomer which is a monofunctional monomer to form the resin film layer. The first monomer and the second monomer satisfy at least one of the following conditions (a) and (b): (a) the HLB value H2 of the second monomer is less than the HLB value H1 of the first monomer; (b) a first polymer component formed using only the first monomer as a monomer and a second polymer component formed using only the second monomer as a monomer are produced according to the following production method (1), and when the water absorption of each polymer component is measured after being left to stand for 40 hours under conditions of 40° C. and 95% relative humidity, the water absorption of the second polymer component is smaller than the water absorption of the first polymer component, in, The manufacturing method (1) comprises the following steps: providing the first monomer or the second monomer as a test monomer; mixing a photoinitiator in a ratio of 0.2±0.01 mole relative to 100 moles of the test monomer to obtain a mixture; injecting the mixture into a disk; as well as The mixture injected into the disk was irradiated with UV light at 120 W and a distance of 250 mm in a nitrogen atmosphere until polymerization stopped, thereby producing a disk-shaped polymer member having a size of 30 mm in diameter×1 mm in depth.

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