WO2012124737A1 - Moisture-proof insulative coating with visible light-blocking properties - Google Patents

Abstract

Provided is a moisture-proof insulative coating for electronic parts which exhibits superior electrical insulation reliability and visible light-shielding properties. The moisture-proofing insulating coating comprises a thermoplastic elastomer, two or more kinds of dyes and a solvent, and the total light transmittance of a coated film produced by coating and drying said coating is 5% or less when the film thickness is 100 μm. The thermoplastic elastomer is preferably a styrene thermoplastic elastomer such as a styrene-butadiene-styrene block copolymer elastomer. At least one of the dyes is preferably an anthraquinone dye. The dye content is preferably 0.1 - 10 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer. The moisture-proofing insulating coating preferably also comprises a tackifier such as a petroleum resin tackifier.

Description

Moisture-proof insulating paint with concealment for visible light

The present invention relates to a moisture-proof insulating coating material in which a coating film prepared by coating and drying has high concealability with respect to visible light. More specifically, the present invention relates to a moisture-proof insulating paint characterized in that the total light transmittance of a coating film prepared by coating and drying by using two or more dyes is 5% or less when the film thickness is 100 μm. Furthermore, the present invention relates to a moisture-proof insulating material obtained by applying and drying the moisture-proof insulating paint. Furthermore, the present invention relates to an electronic component insulated by the moisture-proof insulating material.

Electrical devices tend to be smaller and lighter and more multifunctional year after year, and the mounting circuit boards mounted on the various electrical devices that control them are insulated for the purpose of protecting them from moisture, dust, and gas. . In this insulation treatment method, a protective coating treatment with a moisture-proof insulation paint such as an acrylic resin, a urethane resin, or a silicone resin is widely adopted. In recent years, with the widespread use of liquid crystal monitors, in order to prevent light leakage of LED backlights, it is strongly required to provide a protective coating with a concealing property for visible light.

In order to meet this requirement, all of inorganic fillers, carbon black, and dyes as a concealing material (Japanese Patent Laid-Open No. 2001-123047) or a part thereof (Japanese Patent Laid-Open No. 2008-208179, Japanese Patent Laid-Open No. 2007-031514) JP-A-2006-016437, JP-A-2006-045340, JP-A-2006-335975) are used.

JP 2001-123047 discloses a composition containing silica as an inorganic filler, carbon black as a pigment, and an oil-soluble black dye as a dye. Japanese Patent Application Laid-Open No. 2008-208179 discloses a composition containing silica, titanium dioxide as an inorganic filler, and an organic dye having an absorption wavelength of 300 to 750 nm as a dye. Japanese Patent Application Laid-Open No. 2007-031514 discloses a composition containing silica, magnesium hydroxide, and white titanium oxide as inorganic fillers.
The compositions disclosed in the above-mentioned JP-A Nos. 2001-123047, 2008-208179, and 2007-031514 are used as a semiconductor sealant, and the description about the moisture-proof insulating coating is as follows. Nothing at all. In addition, inorganic fillers and carbon black lead to a decrease in electrical insulation. Further, the inorganic filler, carbon black, which has a larger particle size than the dye, is considered to be particularly disadvantageous for current electronic devices where fine pitches are being advanced.

Furthermore, JP-A-2006-016437 discloses a composition containing an acrylic polymer as a resin and an azine dye as a dye. However, the acrylic polymer has a low heat resistance of 80 to 100 ° C., and has a drawback that its use is limited for the current electronic equipment that generates a large amount of heat due to high integration.

JP-A 2006-045340 discloses a composition containing an ABA type styrene block copolymer rubber as a thermoplastic elastomer and an azo compound chromium complex as a dye. However, azo dyes have a drawback that there is a concern about environmental and human effects. Furthermore, although 100 mass parts of the thermoplastic elastomer is added with an amount of dye reaching 25 mass parts, the transmittance is 10% and 25% in the wavelength region of 650 nm and 700 nm, respectively. It is hard to say that concealment is sufficient. Moreover, adding a large amount of dye and reducing the proportion of the resin responsible for electrical insulation leads to a decrease in electrical insulation. In addition, if an amount of the dye exceeding the compatibility with the thermoplastic elastomer is added, the dye is precipitated, and a further decrease in electrical insulation can be considered. Furthermore, azo dyes are materials that are likely to have adverse effects on the environment and the human body, and it is desirable not to use them.

JP-A-2006-335975 discloses a composition containing an ABA type styrene block copolymer rubber as a thermoplastic elastomer and an azine dye as a dye. However, despite the addition of an amount of dye reaching 25 parts by mass with respect to 100 parts by mass of the elastomer, the transmittance is 9% and 22% in the wavelength region of 650 nm and 700 nm, respectively. It is hard to say that sex is enough. Moreover, adding a large amount of dye and reducing the proportion of the resin responsible for electrical insulation leads to a decrease in electrical insulation. In addition, if an amount of the dye exceeding the compatibility with the thermoplastic elastomer is added, the dye is precipitated, and a further decrease in electrical insulation can be considered.

On the other hand, JP-A-10-036722 discloses a composition containing silica as an inorganic filler and black titanium oxide as a pigment. This composition shows a concealment ratio of 95% or more in a paint test in accordance with JIS K5400, but there is no description about moisture-proof insulating paint.

Japanese Patent Laid-Open No. 2001-123047 JP 2008-208179 A JP 2007-031514 A JP 2006-016437 A JP 2006-045340 A JP 2006-335975 A Japanese Patent Laid-Open No. 10-036722

Therefore, in order to satisfy both high electrical insulation and high concealability for visible light at the same time, moisture-proof insulation that does not use inorganic fillers and carbon black, provides concealment only with a dye, and does not cause a decrease in electrical insulation. Paint is desired.

The present invention relates to a moisture-proof insulating coating material in which a coating film prepared by coating and drying has high concealability to visible light, a moisture-proof insulating material obtained by applying and drying the moisture-proof insulating coating material, and the moisture-proof coating material. It is an object to provide an electronic component insulated by an insulating material.

As a result of intensive studies to solve the above problems, the inventors of the present invention are moisture-proof insulating paints containing a thermoplastic elastomer, two or more dyes and a solvent as essential components, and the coatings prepared by applying and drying the paints. When the film thickness is 100 μm, the moisture-proof insulating coating with a total light transmittance of 5% or less of the coating film has both high electrical insulation and high hiding power for visible light. The present inventors have found that the above problems can be solved by using a coating film prepared by coating and drying, and have completed the present invention.

That is, the present invention (I) is a moisture-proof insulating paint containing a thermoplastic elastomer, two or more dyes and a solvent, and the coating film prepared by applying and drying the paint has a total light transmittance of 100 μm. Is a moisture-proof insulating paint characterized by being 5% or less.
The present invention (II) is a moisture-proof insulating material obtained by applying and drying the moisture-proof insulating paint of the present invention (I).
The present invention (III) is an electronic component insulated by the moisture-proof insulating material of the present invention (II).

Furthermore, the present invention relates to the following [1] to [12].
[1] A moisture-proof insulating paint containing a thermoplastic elastomer, two or more dyes and a solvent, and the total light transmittance of a coating film prepared by applying and drying the paint is 5% or less when the film thickness is 100 μm. Moisture-proof insulating paint characterized by being
[2] The moisture-proof insulating paint according to [1], wherein the blending ratio of the dye to the thermoplastic elastomer is in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer.
[3] The moisture-proof insulating paint according to [1] or [2], wherein the thermoplastic elastomer is a styrene-based thermoplastic elastomer.
[4] The moisture-proof insulating paint according to any one of [1] to [3], wherein at least one of the two or more dyes is an anthraquinone dye.
[5] The moisture-proof insulating paint according to any one of [1] to [4], wherein the solvent includes an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 140 ° C.
[6] The moisture-proof insulating paint according to [5], wherein the solvent further contains an acetate ester and / or a carbonate ester.
[7] The ratio of the amount of the thermoplastic elastomer (the total amount of the thermoplastic elastomer and the tackifier when the moisture-proof insulating paint includes a tackifier) to the total amount of the moisture-proof insulating paint is 10 to 40% by mass The moisture-proof insulating paint according to any one of [1] to [6].
[8] The moisture-proof insulating paint according to any one of [1] to [7], wherein the viscosity at 25 ° C. is 1500 mPa · s or less.
[9] The moisture-proof insulating paint according to any one of [1] to [8], further including a tackifier.
[10] The moisture-proof insulating paint according to [9], wherein the tackifier is a petroleum resin-based tackifier.
[11] A moisture-proof insulating material obtained by applying and drying the moisture-proof insulating paint according to any one of [1] to [10].
[12] An electronic component insulated by the moisture-proof insulating material according to [11].

The coating film prepared by applying and drying the moisture-proof insulating paint of the present invention (that is, the moisture-proof insulating material of the present invention) has both high electrical insulation reliability and high concealability for visible light. Therefore, the electronic component covered with the moisture-proof insulating material of the present invention has both high concealability with respect to visible light and high electrical insulation reliability.
In other words, by using the moisture-proof insulating paint of the present invention, an electronic component that produces a coating film that maintains high electrical insulation reliability over a long period of time and a high concealment property against visible light, and that maintains high reliability over a long period of time. Can be manufactured.

Hereinafter, the present invention will be specifically described.
First, the moisture-proof insulating paint of the present invention (I) will be described.
The present invention (I) is a moisture-proof insulating paint containing a thermoplastic elastomer, two or more dyes and a solvent, and the total light transmittance of a coating film produced by applying and drying the paint is 100 μm. And 5% or less.

First, the thermoplastic elastomer which is an essential component of the moisture-proof insulating paint of the present invention (I) will be described.
The “thermoplastic elastomer” described in the present specification is flowable by heating and can be molded in the same manner as a normal thermoplastic resin, and exhibits rubber elasticity (that is, remarkable elastic recovery) at room temperature. Details of the polymer compound are described in the Physics and Chemistry Dictionary Editorial Committee, “All about Thermoplastic Elastomers”, the first edition, the first edition, published by Kogyo Kenkyukai, December 20, 2003. ing.

Examples of the thermoplastic elastomer that is an essential component of the moisture-proof insulating coating of the present invention (I) include styrene-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, olefin-based thermoplastic elastomers, urethane-based thermoplastic elastomers, and polyester-based thermoplastic elastomers. , Nitrile thermoplastic elastomer, polyamide thermoplastic elastomer, fluorine thermoplastic elastomer, chlorinated polyethylene thermoplastic elastomer, silicone thermoplastic elastomer, and the like. The above may be used in combination.

“Styrenic thermoplastic elastomer” described in the present specification means a thermoplastic elastomer having a structural unit derived from styrene in a molecular structure, and is generally a block copolymer of styrene and olefin. .
Unlike other thermoplastic elastomers, the “vinyl chloride thermoplastic elastomer” described in this specification is not a copolymer of hard segments and soft segments, but is a part of suspension or emulsion polymerization during the production of soft polyvinyl chloride. It means a thermoplastic elastomer composed of gel polyvinyl chloride containing a crosslinked gel, a plasticized product of polyvinyl chloride having a high degree of polymerization, nitrile-butadiene rubber-modified polyvinyl chloride and the like.
The “polyurethane-based thermoplastic elastomer” described in the present specification means a thermoplastic elastomer obtained by reacting poly (ester) polyol, poly (carbonate) polyol and / or poly (ether) polyol with isocyanate. .
The “olefin-based thermoplastic elastomer” described in the present specification is generally a thermoplastic elastomer in which ethylene-propylene rubber (EPDM, EPM) is finely dispersed in polypropylene, or a polypropylene unit as a hard segment, It means a thermoplastic elastomer of a copolymer having a copolymer unit containing polyethylene or the like as a soft segment.
The “polyester-based thermoplastic elastomer” described in the present specification is a polycarboxylic acid having an aromatic ring represented by terephthalic acid or dimethyl terephthalate or an ester compound thereof, an alkylene polyol, a poly (ether) polyol, a poly ( It means a thermoplastic elastomer that can be produced by transesterification or polycondensation reaction using ester) polyol and / or poly (carbonate) polyol as raw materials.
“Nitrile-based thermoplastic elastomer” described in the present specification is a melt-kneaded olefin-based thermoplastic elastomer and nitrile rubber (copolymer rubber of α, β-unsaturated nitrile and conjugated diene), and a crosslinking agent. It means a thermoplastic elastomer that can be produced by adding (phenol resin crosslinking agent, sulfur crosslinking agent, organic peroxide, etc.) and crosslinking.
The “polyamide thermoplastic elastomer” described in the present specification includes a polyamide as a hard segment, and a poly (ester) polyol, a poly (ether) polyol, a poly (carbonate) polyol and / or a poly (alkylene) polyol. It means a thermoplastic elastomer composed of a block copolymer as a soft segment.
The “fluorinated thermoplastic elastomer” described in the present specification means a thermoplastic elastomer composed of a fluorine resin molecule as a hard segment and a fluorine rubber molecule and / or a silicone rubber molecule as a soft segment.
The “chlorinated polyethylene thermoplastic elastomer” described in the present specification means a thermoplastic elastomer in which the hard segment is made of block-type chlorinated polyethylene and the soft segment is made of random chlorinated polyethylene.
The “silicone-based thermoplastic elastomer” described in this specification is a heat which has a —Si—O—Si— bond in the molecule and exhibits physical properties of the elastomer by adding a catalyst such as a peroxide or a platinum compound. It means a plastic elastomer.

Among these thermoplastic elastomers, a styrene thermoplastic elastomer is preferable. Examples of the styrenic thermoplastic elastomer include styrene / butadiene / styrene block copolymer (SBS), styrene / ethylene / butylene / styrene block copolymer (SEBS), styrene / isoprene / styrene block copolymer (SIS), Examples include styrene / ethylene / propylene / styrene block copolymer (SEPS), styrene / vinyl isoprene / styrene block copolymer rubber (SVIS), and the like. Commercially available products of such styrenic thermoplastic elastomers include D1101, D1102, D1155, DKX405, DKX410, DKX415, D1192, D1161, D1171, G1652, and G1730 (above, Kraton Polymer Co., Ltd.), Tufprene (registered trademark) A , TUFPRENE (registered trademark) 125, TUFPRENE (registered trademark) 126S, TUFTEC (registered trademark) H1141, TUFTECH (registered trademark) H1041, TUFTECH (registered trademark) H1043, TUFTECH (registered trademark) H1052 (above, manufactured by Asahi Kasei Chemicals Corporation) ) And the like. These may be a single substance or a mixture of two or more, and a part or all of them may be hydrogenated.

The content of the structural unit derived from styrene contained in the styrenic thermoplastic elastomer is preferably 15 to 50% by mass, more preferably 18 to 45% by mass, based on the total amount of the styrene thermoplastic elastomer. More preferably, it is 19 to 43% by mass. When the content of the structural unit derived from styrene contained in the styrene-based thermoplastic elastomer is less than 15% by mass with respect to the total amount of the styrene-based thermoplastic elastomer, the cohesive force of the elastomer may be insufficient, which is preferable. That's not true. On the other hand, if it exceeds 50% by mass with respect to the total amount of the styrenic thermoplastic elastomer, the rubber-like properties of the elastomer tend to be lost, and the moisture-proof performance tends to be insufficient, which is not preferable.

Next, the dye which is an essential component of the moisture-proof insulating paint of the present invention (I) will be described.
As the dye that is an essential component of the moisture-proof insulating paint of the present invention (I), two or more dyes are used in order to exhibit high light-shielding properties in a wide visible light region.

Examples of the dye used as a component of the moisture-proof insulating paint of the present invention (I) include direct dyes, acid dyes, basic dyes, mordant dyes, acid mordant dyes, vat dyes, disperse dyes, reactive dyes, and fluorescent whitening dyes. , Plastic dyes, and the like. Among these, two or more dyes are used. As color types, it is preferable to combine at least red and blue, and it is more preferable to combine three types of red, yellow and blue.

The “dye” described in the present specification means “a substance that has a property of being soluble in a solvent or having compatibility with a resin and coloring dissolved and compatible substances”.
In addition, the “direct dye” described in the present specification means a dye that is water-soluble and dyes the fiber with a neutral salt or the like in a neutral or weak alkaline bath.
The “acidic dye” described in the present specification means a dye that is water-soluble and dyes fibers with an acid bath such as sulfuric acid, formic acid, and acetic acid.
The “basic dye” described in the present specification means a dye that is water-soluble and dyes in a neutral or weak alkaline bath on a fiber to which an acidic substance such as tannic acid is previously attached.
The “mordant dye” described in the present specification means a dye that is dyed in a mordant dye solution bath on a fiber to which a metal hydroxide or oxide such as chromium, aluminum, iron, or tin is fixed in advance. To do.
The “acid mordant dye” described in the present specification is water-soluble, and the fiber can be dyed with an acid bath of sulfuric acid, formic acid, acetic acid, etc. The dye which can also be dye | stained with a mordant dye solution bath with respect to the fiber which fixed oxide and the oxide is meant.
"Vat dye" described in this specification is insoluble or sparingly soluble in water. It is dissolved in an alkaline bath by reducing the carbonyl group in the chemical structure and dyed by air oxidation of the fibers immersed in the bath It means the dye to do.
The “dispersion dye” described in the present specification means a dye that is insoluble or hardly soluble in water and dyes by immersing fibers in a liquid dispersed in water using a surfactant.
The “reactive dye” described in the present specification means a dye having a chemical structure capable of forming a covalent bond with cellulose, wool, nylon and the like, and dyeing by reacting with those fibers.
The “fluorescent whitening dye” described in the present specification means a dye that absorbs ultraviolet rays and emits blue to violet light having a longer wavelength.
The “plastic dye” described in the present specification means a dye that is oil-soluble and highly compatible with a resin, and is intended to dye a resin rather than a fiber.

Among these, preferred are plastic dyes such as monoazo dyes (Color Index Constitution Number 11000 to 19999), diazo dyes (Colour Index Constitution Number 20000 to 29999), and triaryl dyes (Colour Index Constitution Number). 42000 to 44999), quinoline dyes (Color Index Constitution Number 47000 to 47999), methine dyes (Colour Index Constitution Number 48000 to 48999), azine dyes (Colour Index Constitution Number 50000 to 50999), aminoketone dyes (Colour Index) Constitution Number 56000-56999), anthraquinone dyes (Colour Index Constitution Number 58000-72699), indigoid dyes (Colour Index Constitution Number 72000-72999), and the like. It is further preferred to use the content vital two or more at least one dye selected from dyes.
It is particularly preferable to use a mixture of two or more dyes, at least one of which is an anthraquinone dye (Colour Index Constitution Number 58000 to 72699).

In addition, “Colour Index Constitution Number” described in this specification means “the Society Society of Dyers” and “Colourists” and The “American Association” of “Textile” Chemist “and” Colorists and related materials. In the compound database Color | Index | International, it refers to "Number given based on chemical structure".

The ratio of the dye to the thermoplastic elastomer is not particularly limited, but if the concentration is too low for the thermoplastic elastomer, sufficient concealment cannot be obtained, and if the concentration exceeds the acceptable amount for compatibility with the thermoplastic elastomer, it will dry. Precipitation of dye crystals occurs at times, which adversely affects electrical insulation. Therefore, the ratio of the dye to the thermoplastic elastomer is preferably in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer. Further, it is preferably 0.15 to 5 parts by mass.

Solvents that are essential components of the present invention (I) include diethyl ketone (boiling point 101 ° C.), methyl ethyl ketone (boiling point 79.5 ° C.), diisopropyl ketone (boiling point 125 ° C.), methyl isopropyl ketone (boiling point 94 ° C.), methyl isobutyl. Ketone solvents such as ketone (boiling point 116 ° C) and acetone (boiling point 56.5 ° C), n-heptane (boiling point 98 ° C), n-octane (boiling point 125 ° C), n-hexane (boiling point 69 ° C), cyclohexane (boiling point) 81 ° C), methylcyclohexane (boiling point 101 ° C), cis-1,2-dimethylcyclohexane (boiling point 130 ° C), trans-1,2-dimethylcyclohexane (boiling point 124 ° C), cis-1,3-dimethylcyclohexane (boiling point) 120 ° C), trans-1,3-dimethylcyclohexane (boiling point 124 ° C), ci Aliphatic hydrocarbon solvents such as 1,4-dimethylcyclohexane (boiling point 125 ° C.), trans-1,4-dimethylcyclohexane (boiling point 119 ° C.), ethylcyclohexane (boiling point 130 ° C.) and cyclopentane (boiling point 49 ° C.); Aromatic hydrocarbon solvents such as benzene (boiling point 80 ° C), toluene (boiling point 111 ° C), o-xylene (boiling point 144 ° C), m-xylene (boiling point 139 ° C) and p-xylene (boiling point 138 ° C), diethyl ether (Boiling point 35 ° C.), ether solvents such as dibutyl ether (boiling point 142 ° C.) and tetrahydrofuran (boiling point 66 ° C.), halogenated hydrocarbon solvents such as chloroform (boiling point 61 ° C.) and methylene chloride (boiling point 40 ° C.), ethyl acetate ( Boiling point 77 ° C), methyl acetate (boiling point 56.9 ° C), n-propyl acetate (boiling point 96.6 ° C) Acetates such as n-butyl acetate (boiling point 126 ° C.), isopropyl acetate (boiling point 89 ° C.), isobutyl acetate (boiling point 117 ° C.), sec-butyl acetate (boiling point 112 ° C.) and t-butyl acetate (boiling point 97 ° C.) Solvents, carbonate solvents such as dimethyl carbonate (boiling point 90 ° C), methyl ethyl carbonate (boiling point 107 ° C) and diethyl carbonate (boiling point 126 ° C), nitrile solvents such as acetonitrile (boiling point 82 ° C), 1-butanol (boiling point 118 ° C) ), 2-propanol (boiling point 82 ° C.), 1-propanol (boiling point 97 ° C.), ethanol (boiling point 79 ° C.) and methanol (boiling point 65 ° C.), paraffin oil (boiling point 150-280 ° C.), naphthenic oil (Boiling point 175-280 ° C), mineral spirit (boiling point 130-180 ° C) ) And naphtha (boiling point 30-200 ° C.) and other petroleum fraction solvents, N, N-dimethylformamide (boiling point 153 ° C.) and amide solvents such as N, N-dimethylacetamide (boiling point 165 ° C.), and dimethyl sulfoxide (boiling point) 189 ° C.) and the like. These may be used alone or in combination of two or more.
The total amount of the solvent is preferably 50% by mass or more, more preferably 60 to 80% by mass, based on the entire moisture-proof insulating paint.

Among these, n-heptane (boiling point 98 ° C.), n-octane (boiling point 125 ° C.), cyclohexane (boiling point 81 ° C.), methylcyclohexane (boiling point 101 ° C.), cis-1,2-dimethylcyclohexane are preferable. (Boiling point 130 ° C), trans-1,2-dimethylcyclohexane (boiling point 124 ° C), cis-1,3-dimethylcyclohexane (boiling point 120 ° C), trans-1,3-dimethylcyclohexane (boiling point 124 ° C), cis- 1,4-dimethylcyclohexane (boiling point 125 ° C.), trans-1,4-dimethylcyclohexane (boiling point 119 ° C.), ethylcyclohexane (boiling point 130 ° C.) and the like aliphatic hydrocarbon solvents having a boiling point of 80 ° C. or higher and lower than 140 ° C. It is.
More preferably, methylcyclohexane (boiling point 101 ° C.), cis-1,2-dimethylcyclohexane (boiling point 130 ° C.), trans-1,2-dimethylcyclohexane (boiling point 124 ° C.), cis-1,3-dimethylcyclohexane (boiling point) 120 ° C), trans-1,3-dimethylcyclohexane (boiling point 124 ° C), cis-1,4-dimethylcyclohexane (boiling point 125 ° C), trans-1,4-dimethylcyclohexane (boiling point 119 ° C) and ethylcyclohexane (boiling point) An aliphatic hydrocarbon solvent having a cyclic structure having a boiling point of 90 ° C or higher and lower than 135 ° C.

Further, when using an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 140 ° C., there is no problem using only an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 140 ° C. as the solvent. In order to shorten the drying time after coating, in order to achieve both fast drying after coating and suppression of spinnability during coating, together with an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 140 ° C. Acetate esters and / or carbonate esters can and are preferably used as solvents.

Examples of acetic acid esters include ethyl acetate (boiling point 77 ° C.), methyl acetate (boiling point 56.9 ° C.), n-propyl acetate (boiling point 96.6 ° C.), n-butyl acetate (boiling point 126 ° C.), isopropyl acetate ( A boiling point of 89 ° C.), isobutyl acetate (a boiling point of 117 ° C.), sec-butyl acetate (a boiling point of 112 ° C.), and a t-butyl acetate (a boiling point of 97 ° C.). Of these, preferably n-propyl acetate (boiling point 96.6 ° C.), n-butyl acetate (boiling point 126 ° C.), isobutyl acetate (boiling point 117 ° C.), sec-butyl acetate (boiling point 112 ° C.) and t-acetate -Butyl (boiling point 97 ° C), more preferably n-butyl acetate (boiling point 126 ° C), isobutyl acetate (boiling point 117 ° C) and sec-butyl acetate (boiling point 112 ° C).

Examples of the carbonic acid ester include dimethyl carbonate (boiling point 90 ° C.), methyl ethyl carbonate (boiling point 107 ° C.) and diethyl carbonate (boiling point 126 ° C.), and preferably methyl ethyl carbonate (boiling point 107 ° C.) and Diethyl carbonate (boiling point 126 ° C.), most preferably diethyl carbonate (boiling point 126 ° C.).

The blending ratio of the total amount of acetate ester and carbonate ester and the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 140 ° C. is preferably 2:98 to 30:70 (mass ratio), and more preferably 2:98 to 20:80 (mass ratio). When the blending ratio of the total amount of acetate ester and carbonate ester and the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 140 ° C. is less than 2:98 (mass ratio), It is difficult to achieve both quick drying and suppression of spinnability, which is not preferable. When the blending ratio of the total amount of acetate ester and carbonate ester and the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 140 ° C. is greater than 30:70 (mass ratio), the thermoplastic elastomer In some cases, the solubility becomes low, which is not preferable.

In this specification, unless otherwise specified, “boiling point” refers to “boiling point at 1 atm”.

The total light transmittance of the coating film produced by applying and drying the moisture-proof insulating paint of the present invention is 5% or less, preferably 3% or less, more preferably 2 when the film thickness is 100 μm. % Or less.
The “total light transmittance” described in this specification refers to “total light transmittance defined in JIS K-7105“ Testing methods for optical properties of plastics ”.
In order to produce a moisture-proof insulating paint having a total light transmittance of 5% or less when the film thickness is 100 μm, a paint containing a thermoplastic elastomer, two or more dyes, and a solvent is used. In the preparation, the total amount of the dye was blended in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer, and when the film thickness was 100 μm, The composition with a light transmittance of 5% or less can be determined. When preparing moisture-proof insulating coatings, dissolve thermoplastic elastomers, two or more dyes, and if necessary, tackifiers, antioxidants, leveling agents, antifoaming agents, and silane coupling agents in solvents. May be included). The dissolution method is not particularly limited, and for example, a mix rotor, a planetary mixer, a shaker, or the like can be used. The temperature at the time of dissolution is not particularly limited, but is preferably in the range of 0 to 100 ° C.

It is possible and preferable to add a tackifier to the moisture-proof insulating paint of the present invention (I).
The tackifier used in the present invention is a substance for adding an adhesive function by blending with a polymer compound typified by an elastomer having rubber elasticity. Compared to polymer compounds typified by elastomers, the molecular weight is much smaller. Generally, it is a compound in the oligomer region with a number average molecular weight of several hundred to several thousand, and it does not exhibit rubber elasticity by itself in the glassy state at room temperature. Have.

Tackifiers include rubber tackifiers, acrylic tackifiers, silicone tackifiers, urethane resin tackifiers, petroleum resin tackifiers, rosin ester tackifiers, and terpene resin tackifiers. Agents and the like. Preferred examples include petroleum resin-based tackifiers, such as aliphatic aromatic copolymer petroleum resins, partially hydrogenated aliphatic aromatic copolymer petroleum resins, fully hydrogenated aliphatic aromatic copolymer petroleum resins, dicyclo Pentadiene / aromatic copolymer petroleum resin, partially hydrogenated dicyclopentadiene / aromatic copolymer petroleum resin, fully hydrogenated dicyclopentadiene / aromatic copolymer petroleum resin, aromatic polymerized petroleum resin, partially hydrogenated aromatic polymerized petroleum Resin, fully hydrogenated aromatic polymerized petroleum resin and the like. These tackifiers may be used alone or in combination of two or more.

The ratio of the amount of the thermoplastic elastomer (the total amount of the thermoplastic elastomer and the tackifier when the moisture-proof insulating paint includes a tackifier) to the total amount of the moisture-proof insulating paint is preferably 10 to 40% by mass. When the ratio of the amount of the thermoplastic elastomer to the total amount of the moisture-proof insulating paint (the total amount of the thermoplastic elastomer and the tackifier when the moisture-proof insulating paint contains a tackifier) is larger than 40% by mass, the viscosity increases. If the viscosity becomes too large, the handling property at the time of coating deteriorates, which is not preferable. In addition, when the ratio of the amount of the thermoplastic elastomer to the total amount of the moisture-proof insulating coating (the total amount of the thermoplastic elastomer and the tackifier when the moisture-proof insulating coating includes a tackifier) is less than 10% by mass, The concentration becomes too low, and as a result, the thickness of the coating film after coating and drying may be thinner than the necessary coating film thickness, which is not preferable.

When the moisture-proof insulating coating contains a tackifier, the blending ratio of the thermoplastic elastomer and the tackifier is in the range of 2: 1 to 10: 1, preferably 2.5: 1 to 9. It is in the range of 5: 1, more preferably in the range of 3: 1 to 9: 1. If the blending ratio of the thermoplastic elastomer and the tackifier is greater than 10: 1 by mass ratio, it may not be possible to develop a sufficient adhesive function, which is not preferable. On the other hand, if the blending ratio of the thermoplastic elastomer and the tackifier is less than 2: 1 in terms of mass ratio, the tensile (breaking) strength of the coating after coating and drying may be significantly reduced. As a result, when the moisture-proof insulating film is removed by removing the moisture-proof insulating film that is removed during the repair process, in which the defective part is removed and a new part is re-joined, one piece of the moisture-proof insulating film is cut. Since it may become impossible to remove as a film, it is not preferable.

Furthermore, the moisture-proof insulating paint of the present invention preferably has a viscosity at 25 ° C. of 50 mPa · s or more and 1500 mPa · s or less, and more preferably 1200 mPa · s or less. When the viscosity at 25 ° C. is higher than 1500 mPa · s, the handling property at the time of coating deteriorates, which is not preferable. If it is less than 50 mPa · s, the paint may flow after coating and before drying is completed.
The viscosity described in the present specification is a value measured at 25 ° C. and a rotation speed of 20 rpm using a DV-II + Pro viscometer small sample adapter (spindle model number: SC4-31) manufactured by Brookfield.

An antioxidant can be added to the moisture-proof insulating paint of the present invention (I). Antioxidants include phenolic antioxidants, phosphite antioxidants, thioether antioxidants, and the like. Examples of the phenolic antioxidant include IRGANOX (registered trademark) 1010, IRGANOX (registered trademark) 1035, IRGANOX (registered trademark) 1076, IRGANOX (registered trademark) 1098, IRGANOX (registered trademark) 1135, IRGANOX (registered trademark). 1330, IRGANOX (registered trademark) 1726, IRGANOX (registered trademark) 1425, IRGANOX (registered trademark) 1520, IRGANOX (registered trademark) 245, IRGANOX (registered trademark) 259, IRGANOX (registered trademark) 3114, IRGANOX (registered trademark) 5057 IRGANOX (registered trademark) 565, IRGAMOD (registered trademark) 295, and the like. Examples of the phosphite antioxidant include IRGAFOS (registered trademark) 168. Examples of the thioether-based antioxidant include IRGANOX (registered trademark) PS 800 FD, IRGANOX (registered trademark) PS 802 FD, and the like. These may be used alone or in combination of two or more.

For the moisture-proof insulating paint of the present invention (I), additives such as a leveling agent, an antifoaming agent and a silane coupling agent can be used as necessary.

The leveling agent is not particularly limited as long as it is a material having a function of improving the leveling property of the coating film surface by being added. Specifically, polyether-modified dimethylpolysiloxane copolymer, polyester-modified dimethylpolysiloxane copolymer, polyether-modified methylalkylpolysiloxane copolymer, aralkyl-modified methylalkylpolysiloxane copolymer, and the like can be used. These may be used alone or in combination of two or more.
When a leveling agent is used, it is preferable to add 0.01 to 3 parts by mass of the leveling agent to 100 parts by mass of the moisture-proof insulating paint of the present invention (I). When the amount is less than 0.01 part by mass, the effect of adding the leveling agent may not be exhibited. On the other hand, when the amount is more than 3 parts by mass, the surface of the coating film may become sticky or the insulating properties may be deteriorated depending on the type of the leveling agent used.

The antifoaming agent is not particularly limited as long as it has a function of eliminating or suppressing bubbles generated or remaining when the moisture-proof insulating coating of the present invention (I) is applied. Examples of the antifoaming agent used in the moisture-proof insulating paint of the present invention include known antifoaming agents such as silicone oil, fluorine-containing compounds, polycarboxylic acid compounds, polybutadiene compounds, and acetylenic diol compounds. Specific examples thereof include, for example, BYK-077 (manufactured by Big Chemie Japan Co., Ltd.), SN deformer 470 (manufactured by San Nopco Co., Ltd.), TSA750S (manufactured by Momentive Performance Materials Japan GK), silicone oil SH-203. Silicone defoaming agents such as Toray Dow Corning Co., Ltd., Dappo SN-348 (manufactured by San Nopco), Dappo SN-354 (manufactured by San Nopco), Dappo SN-368 (manufactured by San Nopco), Acetylene such as acrylic polymer antifoaming agents such as Disparon 230HF (manufactured by Enomoto Kasei Co., Ltd.), Surfinol DF-110D (manufactured by Nissin Chemical Industry Co., Ltd.), Surfynol DF-37 (manufactured by Nissin Chemical Industry Co., Ltd.) Diol-based antifoaming agent, FA-630 (Shin-Etsu Chemical) Business Co., Ltd.), a fluorine-containing silicone-based anti-foaming agent such as, etc. can be mentioned. These may be used alone or in combination of two or more.
Usually, 0.001 to 5 parts by mass can be added to 100 parts by mass of the moisture-proof insulating paint of the present invention (I). If the amount is less than 0.01 parts by mass, the effect of adding the antifoaming agent may not be exhibited. On the other hand, when the amount is more than 5 parts by mass, the surface of the coating film may become sticky or the insulating properties may be deteriorated depending on the type of antifoaming agent used.

A silane coupling agent can be used when strong adhesion to a glass or metal oxide of a coating film formed by applying the moisture-proof insulating paint of the present invention (I) is required. A silane coupling agent is an organosilicon compound having a functional group reactively bonded to an organic material and a functional group reactively bonded to an inorganic material in the molecule, and generally has a structure as shown in the following formula (1). Indicated.

Here, Y is a functional group that reacts with an organic material, and examples thereof include a vinyl group, an epoxy group, an amino group, a substituted amino group, an acryloyl group, a methacryloyl group, and a mercapto group. X is a functional group that reacts with an inorganic material and is hydrolyzed by water or moisture to produce silanol. This silanol reacts with the inorganic material. Representative examples of X include an alkoxy group, an acetoxy group, a chlorine atom, and the like. R ¹ is a divalent organic group, and R ² represents an alkyl group. a represents an integer of 1 to 3, and b represents an integer of 0 to 2. However, a + b = 3.

Examples of the silane coupling agent include 3-isocyanatopropyltriethoxysilane, 3-isocyanatopropyltrimethoxysilane, 3-isocyanatopropylmethyldiethoxysilane, 3-isocyanatopropylmethyldimethoxysilane, p-styryltrimethoxysilane, p -Styryltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinyltris (2-methoxyethoxy) silane, 3-acryloyloxypropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3 -Acryloyloxypropyltriethoxysilane, 3-methacryloyloxypropyltriethoxysilane, 3-acryloyloxypropylmethyldimethyl Xysilane, 3-methacryloyloxypropylmethyldimethoxysilane, 3-acryloyloxypropylmethyldiethoxysilane, 3-methacryloyloxypropylmethyldiethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycid Xylpropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, N-2- (aminoethyl) -3-aminopropyl Methyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3- Minopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyl Examples include triethoxysilane and allyltrimethoxysilane.
Among these silane coupling agents, preferred are N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N -(2-aminoethyl) -3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propyl Amino group-containing silane coupling agents such as amines and N-phenyl-3-aminopropyltrimethoxysilane, mercapto group-containing silane coupling agents such as 3-mercaptopropyltrimethoxysilane and 3-mercaptopropyltriethoxysilane, 3- Acryloyloxypropyltriethoxysilane Acryloyl groups such as 3-methacryloyloxypropyltriethoxysilane, 3-acryloyloxypropylmethyldimethoxysilane, 3-methacryloyloxypropylmethyldimethoxysilane, 3-acryloyloxypropylmethyldiethoxysilane, 3-methacryloyloxypropylmethyldiethoxysilane Alternatively, a methacryloyl-containing silane coupling agent can be mentioned, and commercially available products include KBM-503 (manufactured by Shin-Etsu Chemical Co., Ltd.), KBM-903 (manufactured by Shin-Etsu Chemical Co., Ltd.), KBE-903 (manufactured by Shin-Etsu Chemical Co., Ltd.). ), Z-6062 (manufactured by Toray Dow Corning Co., Ltd.), Z-6023 (manufactured by Toray Dow Corning Co., Ltd.), and the like. These can be used alone or in combination of two or more.
In order to provide adhesion to a glass substrate suitable for the moisture-proof insulating paint of the present invention, the amount of the silane coupling agent is 0.1 to 10 parts by mass with respect to 100 parts by mass of the styrenic thermoplastic elastomer. The amount is preferably 0.5 to 8 parts by mass.

Next, the moisture-proof insulating material of the present invention (II) will be described.
The present invention (II) is a moisture-proof insulating material obtained by applying and drying the moisture-proof insulating paint of the present invention (I).
The moisture-proof insulating material of the present invention (II) is a coating film obtained by applying and drying the moisture-proof insulating paint of the present invention (I), and dissolves a thermoplastic elastomer and a dye in a solvent (however, a part of dispersion) The moisture-proof insulating paint of the present invention (I) can be prepared, and can be obtained by drying after application.

Next, the electronic component of the present invention (III) will be described.
The present invention (III) is an electronic component insulated by the moisture-proof insulating material of the present invention (II).
The electronic component of the present invention (III) is applied to the electronic component by a generally known dipping method, brush coating method, spray method, wire drawing method, bar coating method, potting method, etc. It can be obtained by drying using drying, air drying, oven heating or the like.
Examples of the electronic component of the present invention (III) include a microcomputer, a transistor, a capacitor, a resistor, a relay, a transformer, and a mounting circuit board on which these are mounted, and further lead wires, harnesses, and films that are joined to these electronic components. A substrate or the like can also be included. Moreover, the signal input part of flat panel display panels, such as a liquid crystal display panel, a plasma display panel, an organic electroluminescent panel, and a field emission display panel, are also mentioned as an electronic component. In particular, the moisture-proof insulating material of the present invention can be preferably used in IC peripheral parts such as display boards for electronic parts and panel pasting parts.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

Example 1
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier 5.22 g, KP PLAST RED G (Kiwa Chemical Industry Co., Ltd., Color Index Constitution Number 60505) 0.165 g, KP PLAST YELLOW MK (Kiwa Chemical Industry Co., Ltd. anthraquinone dye), Color Index Constitution Number 58839) 0.118 g, Oil Blue 2N (Anthraquinone Dye, Color Index Constitution Number 61554) manufactured by Orient Chemical Industry Co., Ltd. 0.329 g, methylcyclohexane (Maruzen Petrochemical) Product name: Swaclean MCH 20.00 g, ethylcyclohexane (Maruzen Petrochemical Co., Ltd. product name: Swaclean ECH) 39.00 g, n-butyl acetate (Kyowa Hakko Chemical Co., Ltd. product name: Butyl acetate -P) 11.00 g was mixed to make Formulation D1.

Example 2
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier 5.22 g, KP PLAST RED G (Kiwa Chemical Industry Co., Ltd., Color Index Constitution Number 60505) 0.165 g, KP PLAST YELLOW MK (Kiwa Chemical Industry Co., Ltd. anthraquinone dye), Color Index Constitution Number 58839) 0.118 g, KP PLAST BLUE GR (Kiwa Chemical Industries, Ltd. anthraquinone dye, Color Index Constitution Number 61568) 0.329 g, methylcyclohexane (Maruzen Petrochemical) Product name: Suwaclean MCH 20.00 g, ethylcyclohexane (Maruzen Petrochemical Co., Ltd. product name: Swaclean ECH) 39.00 g, n-butyl acetate (Kyowa Hakko Chemical Co., Ltd. product name: Butyl acetate -P) 11.00 g was mixed to make Formulation D2.

Example 3
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier 5.22 g, KP PLAST RED HB (Kiwa Chemical Industry Co., Ltd. anthraquinone dye, Color Index Constitution Number 60510) 0.165 g, KP PLAST YELLOW MK (Kiwa Chemical Industry Co., Ltd. anthraquinone dye), Color Index Constitution Number 58839) 0.118g, Oil Blue 2N (Anthraquinone dyes, Color Index Constitution Number 61554) manufactured by Orient Chemical Industry Co., Ltd., 0.329g, Methylcyclohexane (Maruzen Petrochemical) Product name: Suwaclean MCH 20.00 g, ethylcyclohexane (Maruzen Petrochemical Co., Ltd. product name: Swaclean ECH) 39.00 g, n-butyl acetate (Kyowa Hakko Chemical Co., Ltd. product name: Butyl acetate -P) 11.00 g was mixed to make Formulation D3.

Example 4
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier 5.22 g, KP PLAST RED HB (Kiwa Chemical Industry Co., Ltd. anthraquinone dye, Color Index Constitution Number 60510) 0.165 g, KP PLAST YELLOW MK (Kiwa Chemical Industry Co., Ltd. anthraquinone dye), Color Index Constitution Number 58839) 0.118g, Oil Blue 2N (Anthraquinone dyes, Color Index Constitution Number 61554) manufactured by Orient Chemical Industry Co., Ltd., 0.329g, Methylcyclohexane (Maruzen Petrochemical) Product name: Swaclean MCH 20.00 g, ethylcyclohexane (Maruzen Petrochemicals product name: Swaclean ECH) 39.00 g, diethyl carbonate (Mitsui Chemicals Fine Co., Ltd. product name: Butyl acetate-P ) 11.00 g was mixed to make Formulation D4.

Example 5
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier 5.22 g, KP PLAST RED HB (Kiwa Chemical Co., Ltd. anthraquinone dye, Color Index Constitution Number 60510) 0.165 g, KP PLAST YELLOW MK (Kiwa Chemical Industry anthraquinone dye, Color Index) Constitution Number 58839) 0.118 g, Oil Blue 2N (Anthraquinone dye manufactured by Orient Chemical Co., Ltd., Color Index Constitution Number 61554) 0.329 g, Methylcyclohexane (Maruzen Petrochemical Co., Ltd.) as a solvent Ltd. Product Name: Suwa clean MCH) 20.00g, ethyl cyclohexane (manufactured by Maruzen Petrochemical Co., Ltd., product name: Suwa clean ECH) 50.00g were mixed and the formulation D5.

Example 6
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier 5.22 g, KP PLAST RED G (Kiwa Chemical Industries anthraquinone dye, Color Index Constitution Number 60505) 0.165 g, KP PLAST YELLOW G (Kiwa Chemical Industry Co., Ltd. methine dye, Color Index Constitution) Number 48160) 0.118 g, Oil Blue 2N (Anthraquinone dye manufactured by Orient Chemical Co., Ltd., Color Index Constitution Number 61554) 0.329 g, methylcyclohexane as solvent San (manufactured by Maruzen Petrochemical Co., Ltd., product name: Suwa clean MCH) 20.00g, ethyl cyclohexane (manufactured by Maruzen Petrochemical Co., Ltd., product name: Suwa clean ECH) 50.00g were mixed and the formulations D6.

Example 7
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, and KP PLAST RED HB (an anthraquinone dye manufactured by Kiwa Chemical Co., Ltd., Color Index Constitution Number 60510) as a dye 0.165 g, KP PLAST YELLOW MK (Anthraquinone dye manufactured by Kiwa Chemical Industry Co., Ltd., Color Index Constitution Number 58839) 0.118 g, Oil Blue 2N (Anthraquinone dye manufactured by Orient Chemical Industry Co., Ltd., Color Index Constitution Number 61554) 0 329 g, 20.00 g of methylcyclohexane (manufactured by Maruzen Petrochemical Co., Ltd., trade name: Suwaclean MCH) as a solvent, ethylcyclohexane (manufactured by Maruzen Petrochemical Co., Ltd., trade name: Swaku) Lean ECH) 39.00 g and n-butyl acetate (Kyowa Hakko Chemical Co., Ltd., trade name: butyl acetate-P) 11.00 g were mixed to obtain a formulation D7.

Example 8
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier 5.22 g, KP PLAST RED HB (Kiwa Chemical Industry Co., Ltd. anthraquinone dye, Color Index Constitution Number 60510) 0.283 g, Oil Blue 2N (Oriento Chemical Co., Ltd. anthraquinone dye, Color Index Constitution Number 61554) 0.329 g, methylcyclohexane (trade name: Suwaclean MCH) 20.00 g as a solvent, ethylcyclohexane (trade name: Suwaclean ECH) 39.00 g and 11.00 g of n-butyl acetate (trade name: butyl acetate-P, manufactured by Kyowa Hakko Chemical Co., Ltd.) were mixed to obtain a formulation D8.

Comparative Example 1
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier 5.22 g, KP PLAST BLUE GR (Kiwa Chemical Industry Co., Ltd. anthraquinone dye, Color Index Constitution Number 61568) 0.548 g as a dye, methylcyclohexane (Maruzen Petrochemical Co., Ltd., trade name) 20.00 g of clean MCH), ethylcyclohexane (manufactured by Maruzen Petrochemical Co., Ltd., trade name: Suwaclean ECH) 39.00 g, n-butyl acetate (trade name: butyl acetate-P, manufactured by Kyowa Hakko Chemical Co., Ltd.) 11.00 g Mix to make E1 .

Comparative Example 2
Styrene / isoprene / styrene block copolymer elastomer D1161 (manufactured by Kraton Polymer Co., Ltd., styrene content 15% by mass, equivalent to D1107) 20.00 g, tackifier P-100 (manufactured by Idemitsu Kosan Co., Ltd., hydrogenated dicyclopentadiene) Aromatic copolymer petroleum resin) 10.00 g, OIL BLACK NO. 5 (Orient Chemical Industry Co., Ltd., azine-based dye, Color Index Constitution Number 50415) 5.00 g, ethylcyclohexane (trade name: Suwa Clean ECH, manufactured by Maruzen Petrochemical Co., Ltd.) 70.00 g as a solvent was mixed, and E2 It was.

Comparative Example 3
D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) 23.78 g as a styrene / butadiene / styrene block copolymer elastomer, Quinton (registered trademark) D100 (aliphatic-aromatic copolymer produced by Nippon Zeon Co., Ltd.) as a tackifier Based petroleum resin) 5.22 g, OIL BLACK NO. 5 (Orient Chemical Industry Co., Ltd. azine-based dye, Color Index Constitution Number 50415) 0.165 g, Methylcyclohexane (Maruzen Petrochemical Co., Ltd., trade name: Swaclean MCH) 20.00 g, Ethylcyclohexane (Maruzen Petrochemical) Product name: Swaclean ECH 39.00 g and n-butyl acetate (Kyowa Hakko Chemical Co., Ltd. product name: butyl acetate-P) 11.00 g were mixed to obtain a blend E3.

[Evaluation of formulation]
The properties of Formulations D1 to D8 and E1 to E3 prepared with the above compositions were evaluated by the methods shown below. The results are shown in Table 1.

<Measurement of viscosity>
The viscosity was measured by the following method.
Using a sample of 10 mL, using a viscometer (manufactured by Brookfield, model: DV-II + Pro), using a small sample adapter and a spindle of model number C4-31, at a temperature of 25.0 ° C. and a rotation speed of 20 rpm The value when the viscosity became almost constant was measured.

<Evaluation of presence or absence of spinnability>
The presence or absence of spinnability was evaluated by the following method.
Formulations D1 to D8 and Formulations E1 to E3 were each applied onto glass using a dispenser so that the thickness after drying was about 130 μm. At the end of the coating, the coating liquid was threaded from the tip of the dispenser Judged by whether or not.
A: No filamentous coating liquid is generated. O: A filamentous coating liquid may or may not be generated.
X: A filamentous coating solution is always generated.
<Evaluation of tack free time>
The tack free time was evaluated by the following method.
Apply the blends D1 to D8 and blends E1 to E3 on glass using a dispenser so that the thickness after drying is about 200 μm. After coating, indicate whether the coating surface is sticky every 30 seconds. Confirmed by touch. The first time when stickiness disappeared was defined as tack-free time.
The tack free time is an index of quick drying property, and the shorter the free time, the better.

<Measurement of total light transmittance>
The total light transmittance was measured by the following method.
A self-supporting film was prepared by repeatedly applying Formulations D1 to D8 and Formulations E1 to E3 onto a Teflon (registered trademark) plate using a bar coater so that the thickness after drying was about 100 μm. .
The total light transmittance of these free-standing films was measured with a color / turbidity simultaneous measuring device COH400 (manufactured by Nippon Denshoku Industries Co., Ltd., JIS K-7105).

<Evaluation of long-term electrical insulation reliability using flexible substrates>
A substrate having a fine comb pattern shape described in JPCA-ET01, manufactured by etching a flexible copper-clad laminate (manufactured by Sumitomo Metal Mining Co., Ltd., grade name: Esperflex, copper thickness: 8 μm, polyimide thickness: 38 μm) Copper wiring width / inter-copper wiring width = 15 μm / 15 μm) were applied to tin-plated flexible wiring boards with the compounds D1 to D8 and E1 to E3 so that the thickness after drying was 100 μm. For 10 minutes and then dried at 70 ° C. for 1.5 hours.
Using this test piece, a bias voltage of 30 V was applied, and a constant temperature and humidity test under conditions of a temperature of 110 ° C. and a humidity of 85% RH was performed using MIGRATION TESTER MODEL MIG-8600 (manufactured by IMV). The resistance values were measured 10, 100, and 200 hours after the start of the temperature and humidity steady test.

From the results in Table 1, it can be seen that the formulations D1 to D8 of Examples 1 to 8 have high long-term insulation reliability while having high concealability to visible light. On the other hand, the formulations E1 to E3 of Comparative Examples 1 to 3 have low concealability with respect to visible light. Moreover, the compound E2 of Comparative Example 2 has low long-term insulation reliability. Furthermore, the formulation E2 of Comparative Example 2 has a long tack-free time. That is, it can be seen that the composition of the present invention is suitable for a moisture-proof insulating material having a concealing property, which is applied using a dispenser.

The moisture-proof insulating material of the present invention is a composition that has a high concealability to visible light and is excellent in long-term insulation reliability. By coating with this moisture-proof insulating material, light leakage such as backlight is prevented. However, it is possible to obtain an electronic component that is highly moisture-proof and insulated.

Claims (12)

1. A moisture-proof insulating paint containing a thermoplastic elastomer, two or more dyes and a solvent, and the total light transmittance of a coating film prepared by applying and drying the paint is 5% or less when the film thickness is 100 μm. Moisture-proof insulating paint.
2. The moisture-proof insulating paint according to claim 1, wherein the blending ratio of the dye to the thermoplastic elastomer is in the range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer.
3. The moisture-proof insulating paint according to claim 1 or 2, wherein the thermoplastic elastomer is a styrene-based thermoplastic elastomer.
4. The moisture-proof insulating paint according to any one of claims 1 to 3, wherein at least one of the two or more dyes is an anthraquinone dye.
5. The moisture-proof insulating paint according to any one of claims 1 to 4, wherein the solvent contains an aliphatic hydrocarbon solvent having a boiling point of 80 ° C or higher and lower than 140 ° C.
6. 6. The moisture-proof insulating paint according to claim 5, wherein the solvent further contains acetate ester and / or carbonate ester.
7. The ratio of the amount of the thermoplastic elastomer to the total amount of the moisture-proof insulating paint (the total amount of the thermoplastic elastomer and the tackifier when the moisture-proof insulating paint contains a tackifier) is 10 to 40% by mass. The moisture-proof insulating paint according to any one of claims 1 to 6.
8. The moisture-proof insulating paint according to any one of claims 1 to 7, wherein the viscosity at 25 ° C is 1500 mPa · s or less.
9. The moisture-proof insulating paint according to any one of claims 1 to 8, further comprising a tackifier.
10. The moisture-proof insulating paint according to claim 9, wherein the tackifier is a petroleum resin-based tackifier.
11. A moisture-proof insulating material obtained by applying and drying the moisture-proof insulating paint according to any one of claims 1 to 10.
12. An electronic component insulated by the moisture-proof insulating material according to claim 11.