WO2012115011A1

WO2012115011A1 - Moistureproof insulation material

Info

Publication number: WO2012115011A1
Application number: PCT/JP2012/053859
Authority: WO
Inventors: 一彦大賀
Original assignee: 昭和電工株式会社
Priority date: 2011-02-25
Filing date: 2012-02-17
Publication date: 2012-08-30
Also published as: JP5893001B2; KR101477039B1; CN103392210B; TW201247798A; JPWO2012115011A1; TWI466962B; KR20130114199A; CN103392210A

Abstract

Provided is a moistureproof insulation material that has a solid content concentration that is able to secure a thickness capable of achieving sufficient moistureproofness after coating/drying, within a viscosity range wherein the moistureproof insulation material can be easily applied with a dispenser, and that has excellent adhesion characteristic with respect to glass base material or polyimide, and excellent long-term insulation reliability. Also provided is an electronic part insulated with the moistureproof insulation material. The present invention is a moistureproof insulation material comprising a styrenic thermoplastic elastomer, a tackifier, and a solvent, and is characterized in having the aforementioned solvent further comprising an aliphatic hydrocarbon type solvent having a boiling point of not less than 80°C and less than 110°C, and a solvent comprising dialkyl carbonate indicated by the following chemical formula (1) (diethyl carbonate or dimethyl carbonate, for example). Preferably, the solvent further comprises an aliphatic hydrocarbon type solvent having a boiling point of not less than 110°C and less than 140°C (ethylcyclohexane or dimethylcyclohexane, for example). (R¹ and R² in the chemical formula (1) indicate a methyl group and an ethyl group, respectively, and independent of each other)

Description

Moisture-proof insulation material

The present invention relates to a moisture-proof insulating material for an electronic component excellent in workability and quick drying property, and an electronic component insulated by the moisture-proof insulating material.

Conventionally, in the manufacturing process of electronic devices, coating with an insulating film is performed for the purpose of protecting exposed metal parts such as mounting circuit boards and electrodes from moisture, dust, corrosive gas, and the like. This coating material includes types such as an ultraviolet curable type, a moisture curable type, and a solvent dry type, and acrylic resin, silicone resin, styrene block copolymer resin, and the like are used, respectively.

Moisture-curing coating materials are excellent in moisture resistance of silicone resin itself, but have moisture permeability, so there is a problem that a thick coating material must be applied to protect the metal of circuits and electrodes. is there.

UV curable coating materials are widely used because they can be cured in a short time and have excellent productivity. As such an ultraviolet curable coating material, for example, a polyolefin polyol described in JP-A-2007-308681 and a urethane-modified acrylate compound derived from a polycarbonate polyol described in JP-A-2007-332279 are known. ing.

In the electronic device manufacturing process, there is a repair process in which when a defect is confirmed after the coating treatment with the moisture-proof insulating material is performed, the defective part is removed and a new part is joined again. When the parts are rejoined in this repair process, the location where the problem occurs is uncertain, so positioning during ultraviolet irradiation is difficult, and solvent-drying coating materials are often used.

As a solvent-drying type coating material composition, JP-A No. 2003-145687 discloses a composition comprising a styrene thermoplastic elastomer, a tackifier, and toluene. However, from the viewpoint of toxicity and environment, it is desired to use a solvent having a smaller influence than toluene.

JP-A-2005-126456, JP-A-2005-162986, JP-A-2006-16531, and JP-A-2006-45340 disclose styrenic thermoplastic elastomers, tackifiers, and silane coupling agents. And a composition consisting of ethylcyclohexane. However, in a solvent containing ethylcyclohexane as a main component, if the solid content concentration is increased in order to increase the drying property, the viscosity of the composition increases, and as a result, workability (ie, potting performance) decreases. In addition, when the amount of ethylcyclohexane is increased in order to reduce the viscosity, when a film thickness after drying of about 130 μm is formed, it takes about 5 minutes or more until tack disappears at room temperature. Was in the situation.

JP 2007-308681 A JP 2007-332279 A JP 2003-145687 A JP 2005-126456 A JP 2005-162986 A JP 2006-16531 A JP 2006-45340 A

Since the solvent-drying coating material does not involve a curing reaction, the necessary physical properties must be expressed only by coating and drying, and the molecular weight of the resin must be increased. However, as the molecular weight of the resin increases, the viscosity of the coating material increases and workability decreases. Alternatively, if the coating material is diluted to ensure workability, the thickness of the coating film after application / drying may be reduced, resulting in inferior moisture resistance. Since it took a long time, there was a problem that productivity decreased.

In order to improve the efficiency of the process, it is desirable that the solvent-drying type coating material be transferred to the next process in about 3 minutes or less after application, and quick drying is required. However, if the drying is too fast, the potting liquid may have a stringiness during potting, and if it is severe, problems such as clogging of the syringe tip will occur, so an appropriate drying property is required.

As a result of intensive studies to solve the above problems, the present inventors have found that an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. in a solvent-drying coating material containing a styrene-based thermoplastic elastomer. It has been found that by using a solvent composed of a dialkyl carbonate in combination with a main component of a solvent, an excellent moisture-proof insulating film having a low viscosity and sufficient solid content concentration and expressing quick drying properties can be obtained. The invention has been completed.

That is, the present invention (I) is a moisture-proof insulating material containing a styrenic thermoplastic elastomer, a tackifier, and a solvent, wherein the solvent has an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 110 ° C. Formula (1)

(In Formula (1), R ¹ and R ² each independently represents a methyl group or an ethyl group.)
It is a moisture-proof insulating material characterized by including the solvent which consists of dialkyl carbonate represented by these.

The present invention (II) is an electronic component that has been insulated using the moisture-proof insulating material of the present invention (I).

Furthermore, the present invention relates to the following [1] to [11].
[1] A moisture-proof insulating material containing a styrene-based thermoplastic elastomer, a tackifier, and a solvent, wherein the solvent has a boiling point of 80 ° C. or higher and lower than 110 ° C. and formula (1)

(In Formula (1), R ¹ and R ² each independently represents a methyl group or an ethyl group.)
A moisture-proof insulating material comprising a solvent comprising a dialkyl carbonate represented by the formula:
[2] The moisture-proof insulating material according to [1], wherein the solvent further includes an aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or higher and lower than 140 ° C.
[3] The mass ratio of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 110 ° C. contained in the moisture-proof insulating material to the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or higher and lower than 140 ° C. is 65:35. The moisture-proof insulating material according to [2], which is in a range of ˜97: 3.
[4] The total amount of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. and the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C. contained in the moisture-proof insulating material and formula (1) The moisture-proof insulating material according to any one of [1] to [3], wherein the mass ratio of the solvent comprising dialkyl carbonate represented by the formula is in the range of 85:15 to 98: 2.
[5] The moisture-proof according to any one of [1] to [4], wherein the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 110 ° C. is cyclohexane and / or methylcyclohexane. Insulating material.
[6] An aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or higher and lower than 140 ° C. is cis-1,2-dimethylcyclohexane, cis-1,3-dimethylcyclohexane, cis-1,4-dimethylcyclohexane, trans- [2] to [5], which are at least one selected from the group consisting of 1,2-dimethylcyclohexane, trans-1,3-dimethylcyclohexane, trans-1,4-dimethylcyclohexane and ethylcyclohexane The moisture-proof insulating material according to any one of the above.
[7] The total amount of the styrene-based thermoplastic elastomer and the tackifier is 20 to 40% by mass and the total amount of the solvent is 60 to 80% by mass with respect to the total mass of the moisture-proof insulating material. Aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. contained in the moisture-proof insulating material, wherein the mass ratio of the styrene thermoplastic elastomer and the tackifier contained is in the range of 2: 1 to 10: 1. And the total amount of the solvent composed of the dialkyl carbonate represented by the formula (1) is 65% by mass or more based on the total amount of the solvent, and the moisture-proof insulating material has a viscosity at 25 ° C. of 1.2 Pa · s or less. The moisture-proof insulating material according to any one of [1] to [6], wherein
[8] The styrene thermoplastic elastomer is selected from the group consisting of a styrene-butadiene block copolymer elastomer, a styrene-isoprene block copolymer elastomer, a styrene-ethylene / butylene block copolymer elastomer, and a styrene-ethylene / propylene block copolymer elastomer. The moisture-proof insulating material according to any one of claims 1 to 7, wherein the moisture-proof insulating material is at least one selected.
[9] The content of structural units derived from styrene contained in the styrenic thermoplastic elastomer is 15 to 50% by mass based on the total amount of the styrenic thermoplastic elastomer [1] to [8] The moisture-proof insulating material according to any one of the above.
[10] The moisture-proof insulating material according to any one of [1] to [9], wherein the tackifier is a petroleum resin tackifier.
[11] An electronic component that is insulated using the moisture-proof insulating material according to any one of [1] to [10].

The moisture-proof insulating material of the present invention has a low viscosity and a sufficient solid content concentration, and is excellent in workability, adhesion to a substrate, moisture-proof, and insulation reliability. Thus, an electronic component that is highly moisture-proof and insulated can be obtained.

The present invention will be specifically described below.
First, the moisture-proof insulating material of the present invention (I) will be described.
The present invention (I) is a moisture-proof insulating material containing a styrenic thermoplastic elastomer, a tackifier, and a solvent, wherein the solvent has an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 110 ° C. and a formula ( A moisture-proof insulating material comprising a solvent comprising a dialkyl carbonate represented by 1).

(In Formula (1), R ¹ and R ² each independently represents a methyl group or an ethyl group.)

The “thermoplastic elastomer” described in the present specification is flowable by heating and can be molded in the same manner as ordinary thermoplastics, and exhibits rubber elasticity (that is, remarkable elastic recovery) at room temperature. This is a high-molecular compound with properties. Details are described in “Edition Committee for Physicochemical Dictionary”, “All about Thermoplastic Elastomers”, first edition, first edition, published by Industrial Research Co., Ltd., December 20, 2003. ing.

Also, the “styrene thermoplastic elastomer” described in the present specification means a thermoplastic elastomer having a structural unit derived from styrene in the molecular structure.

The styrene thermoplastic elastomer used for the moisture-proof insulating material of the present invention (I) is excellent in moisture resistance and insulation reliability. Examples of styrenic thermoplastic elastomers include styrene-butadiene block copolymer elastomers, styrene-isoprene block copolymer elastomers, styrene-ethylene / butylene block copolymer elastomers, styrene-ethylene / propylene block copolymer elastomers, and the like. it can. 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, TUFTEC (registered trademark) H1052, (above, Asahi Kasei Chemicals Corporation Manufactured). These can be used alone or in combination of two or more.

The content of structural units derived from styrene contained in the styrene-based thermoplastic elastomer is preferably 15 to 50% by mass, more preferably 18 to 45% by mass, based on the total amount of the styrene-based 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.

The tackifier used in the present invention is a substance that is added to a polymer compound typified by an elastomer having rubber elasticity to give an adhesive function. Compared to a polymer compound typified by an elastomer, the molecular weight is much smaller and is generally a compound in an oligomer region having a molecular weight of several hundred to several thousand, and has a property of not exhibiting rubber elasticity by itself in a glass state at room temperature.

As the tackifier, a petroleum resin tackifier, a terpene resin tackifier, a rosin resin tackifier, a coumarone indene resin tackifier, a styrene resin tackifier, or the like can be generally used.

Examples of petroleum resin tackifiers include aliphatic petroleum resins, aromatic petroleum resins, aliphatic-aromatic copolymer petroleum resins, alicyclic petroleum resins, dicyclopentadiene resins, and hydrogenated products thereof. Of the modified product. The synthetic petroleum resin may be C5 or C9.

Examples of the terpene resin tackifier include β-pinene resin, α-pinene resin, terpene-phenol resin, aromatic modified terpene resin, hydrogenated terpene resin and the like. Many of these terpene resins are resins having no polar group.

Rosin resin tackifiers include rosins such as gum rosin, tall oil rosin, wood rosin; hydrogenated rosin, disproportionated rosin, polymerized rosin, modified rosin such as maleated rosin; rosin glycerin ester, hydrogenated rosin ester, water Examples thereof include rosin esters such as rosin glycerol ester. These rosin resins have polar groups.

Of these tackifiers, petroleum resin tackifiers and terpene resin tackifiers are preferred. Furthermore, a petroleum resin tackifier is preferable.

These tackifiers can be used alone or in combination of two or more.

With respect to the blending amount of the styrenic thermoplastic elastomer and the tackifier, the total blending amount of the styrenic thermoplastic elastomer and the tackifier is 20 to 40% by mass, preferably 22 with respect to the total mass of the moisture-proof insulating material. It is -35 mass%, More preferably, it is 23-33 mass%. If the total amount of the styrene-based thermoplastic elastomer and the tackifier is less than 20% by mass with respect to the total mass of the moisture-proof insulating material, the thickness of the coating material becomes thin, and sufficient moisture-proof properties and film strength can be obtained. There may not be. Furthermore, when solid content concentration becomes low, time until the coating-film surface tack after application | coating disappears becomes long, As a result, productivity may become low. Further, when the total blending amount of the styrene thermoplastic elastomer and the tackifier is more than 40% by mass with respect to the total mass of the moisture-proof insulating material, the viscosity of the coating material becomes high, the workability is inferior, and it is applied uniformly. When it becomes difficult, or when potting with a dispenser, the syringe may be clogged, which is not preferable.

The blending ratio of the styrenic thermoplastic elastomer and the tackifier is in the range of 2: 1 to 10: 1, preferably in the range of 2.5: 1 to 9.5: 1, by mass ratio. The range is preferably 3: 1 to 9: 1.
If the blending ratio of the styrene-based thermoplastic elastomer and the tackifier is greater than 10: 1 by mass ratio, it may not be possible to develop a sufficient adhesion function, which is not preferable. On the other hand, if the blending ratio of the styrene-based thermoplastic elastomer and the tackifier is less than 2: 1 by mass ratio, the tensile (breaking) strength of the coating after application 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.

The moisture-proof insulating material of the present invention (I) contains an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 110 ° C. as an essential component. In this specification, unless otherwise specified, the boiling point refers to the boiling point at 1 atmosphere.
The term “aliphatic hydrocarbon solvent” means a solvent composed of only aliphatic hydrocarbons or a solvent containing approximately 80% or more of aliphatic hydrocarbons.

Examples of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 110 ° C. include n-heptane (boiling point 98.4 ° C.), cyclohexane (boiling point 80.7 ° C.), methylcyclohexane (boiling point 101.1 ° C.). Etc. Of these, preferred are cyclohexane and methylcyclohexane. Most preferred is methylcyclohexane.

The moisture-proof insulating material of the present invention (I) contains a solvent composed of a dialkyl carbonate represented by the formula (1) as an essential component.

Examples of the solvent comprising the dialkyl carbonate represented by the formula (1) include dimethyl carbonate, methyl ethyl carbonate, and diethyl carbonate.
Of these, diethyl carbonate is most preferable in consideration of the balance between quick drying and spinnability.

It is preferable that the moisture-proof insulating material of the present invention (I) further includes an aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or higher and lower than 140 ° C.
Examples of the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or higher and lower than 140 ° C. include n-octane (boiling point 125.7 ° C.), cis-1,2-dimethylcyclohexane (boiling point 129.7 ° C.), cis- 1,3-dimethylcyclohexane (boiling point 120.1 ° C.), cis-1,4-dimethylcyclohexane (boiling point 124.3 ° C.), trans-1,2-dimethylcyclohexane (boiling point 123.4 ° C.), trans-1, Examples thereof include 3-dimethylcyclohexane (boiling point 124.5 ° C.), trans-1,4-dimethylcyclohexane (boiling point 119.4 ° C.), ethylcyclohexane (boiling point 132 ° C.), and the like. Of these, preferred are cis-1,2-dimethylcyclohexane, cis-1,3-dimethylcyclohexane, cis-1,4-dimethylcyclohexane, trans-1,2-dimethylcyclohexane, trans-1, 3-Dimethylcyclohexane, trans-1,4-dimethylcyclohexane, and ethylcyclohexane. Considering availability, ethylcyclohexane is most preferable.

In addition, an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C., a solvent comprising a dialkyl carbonate represented by the formula (1), and an aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C. It is possible to use these solvents in combination as long as the characteristics are not impaired. Examples of these solvents include hydrocarbon solvents having an alicyclic structure such as decahydronaphthalene, acetate esters such as n-propyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, isopropyl acetate, and ethyl acetate. Solvents, ether solvents such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol monoethyl ether, propylene glycol dimethyl ether, propylene glycol monomethyl ether, alcohol solvents such as ethanol, 1-propanol, 2-propanol, acetone, methyl ethyl ketone, Examples thereof include ketone solvents such as methyl isobutyl ketone and petroleum naphtha. In consideration of the drying property and workability under the condition of no wind at room temperature after applying the moisture-proof insulating material, the boiling point is desirably 140 ° C. or less, specifically, n-butyl acetate, isobutyl acetate, t-butyl acetate Acetate solvents such as isopropyl acetate, ethyl acetate, and n-propyl acetate are preferred, and n-propyl acetate, isobutyl acetate, t-butyl acetate, and n-butyl acetate are more preferred.

The total amount of the solvent contained in the moisture-proof insulating material is preferably 60 to 80% by mass, more preferably 65 to 78% by mass, and still more preferably 70 to 76% by mass with respect to the total mass of the moisture-proof insulating material. It is. When the total amount of the solvent is too large, the thickness of the coating material becomes thin and sufficient moisture resistance and film strength may not be obtained. Furthermore, when solid content concentration becomes low, time until the coating-film surface tack after application | coating disappears becomes long, As a result, productivity may become low. On the other hand, if the total amount of the solvent is too small, the viscosity of the coating material becomes high, the workability is inferior, it becomes difficult to apply uniformly, and the syringe may be clogged when potting with a dispenser. .

When an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. and an aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C. are used in combination, the blending ratio is preferably a mass ratio. Is 65:35 to 97: 3, more preferably 68:32 to 95: 5. When the blending ratio of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. and the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C. is less than 65:35 by mass ratio, moisture-proof insulation After applying the material, it may take a long time to eliminate tackiness on the surface of the coating film. When the blending ratio of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. and the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C. is greater than 97: 3 by mass ratio, In the case of a composition having a high thermoplastic elastomer concentration, drying is too fast, the syringe of the dispenser may be clogged, and the coating solution may have spinnability, which is not preferable.

An aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. contained in the moisture-proof insulating material (when an aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C. is used in combination, 80 ° C. or more and 110 ° C. The total mass of the aliphatic hydrocarbon solvent having a boiling point of less than ℃ and the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C.) and the mass ratio of the solvent comprising the dialkyl carbonate represented by the formula (1) is , Preferably in the range of 85:15 to 98: 2, and more preferably in the range of 88:12 to 97: 3. If the ratio of the solvent composed of dialkyl carbonate is too small, the coating solution may have spinnability when the solution is applied from the dispenser. On the other hand, if the ratio of the solvent composed of dialkyl carbonate is too large, the solubility of the heat-flexible elastomer may decrease.

The total amount of the solvent composed of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 110 ° C. contained in the moisture-proof insulating material and the dialkyl carbonate represented by the formula (1) is preferably relative to the total amount of the solvent. It is 65% by mass or more, more preferably 70 to 98% by mass. If the total amount of the solvent consisting of an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. and the dialkyl carbonate represented by the formula (1) is too small, the solubility in the thermoplastic elastomer, the liquid from the dispenser It is difficult to control in a well-balanced manner with respect to the four items of suppression of the spinnability of the coating liquid at the time of coating, the time until tackiness of the coating surface after application of the moisture-proof insulating material and the viscosity of the moisture-proof insulating material are eliminated. There is a tendency and it cannot be said that it is preferable.

The ratio of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or higher and lower than 110 ° C. to the total solvent is preferably 65 to 95% by mass, more preferably 70 to 93% by mass.
The proportion of the solvent consisting of the dialkyl carbonate represented by the formula (1) in the total solvent is preferably 2 to 15% by mass, more preferably 2 to 10% by mass.
When an aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C. is used in combination, an aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C., a dialkyl carbonate represented by the formula (1) The ratio of the total amount of the solvent consisting of the above and the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or higher and lower than 140 ° C. to the total solvent is preferably 70 to 100% by mass.

In the moisture-proof insulating material of the present invention (I), the moisture-proof insulating material has a viscosity at 25 ° C. of preferably 1.2 Pa · s or less, more preferably 1.1 Pa · s or less, and still more preferably 1. 0 Pa · s or less. Since it is generally applied using a dispenser, the pressure at the time of application increases when the viscosity of the moisture-proof insulating material at 25 ° C. is higher than 1.2 Pa · s in consideration of the pressure of the dispenser. When the moisture-proof insulating material is applied by a dispenser, the spread after the application is suppressed, and as a result, there is a concern that the thickness after drying becomes unnecessarily thick, which is not preferable.

In addition, 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.

In the moisture-proof insulating material of the present invention (I), additives such as a leveling agent, an antifoaming agent, an antioxidant, a coloring 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 when 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. 0.01 to 3 parts by mass can be added to 100 parts by mass of the moisture-proof insulating material 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 an action of eliminating or suppressing bubbles generated or remaining when the moisture-proof insulating material of the present invention (I) is applied. Examples of antifoaming agents used in the moisture-proof insulating material of the present invention (I) include known antifoaming agents such as silicone oils, 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 material 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.

Examples of the colorant include known inorganic pigments, organic pigments, organic dyes, and the like, and each is blended according to a desired color tone. The colorant used in the moisture-proof insulating material of the present invention (I) is preferably an oil-soluble dye. Specific examples include, for example, OIL BLACK860 (manufactured by Orient Chemical Industry Co., Ltd.), OIL BLACK 803 (Orient Chemical Industry Co., Ltd.). And OIL BLUE 2N (made by Orient Chemical Co., Ltd.), OIL BLUE 630 (made by Orient Chemical Co., Ltd.), SOT Black (made by Hodogaya Chemical Co., Ltd.), and the like. These may be used alone or in combination of two or more. Usually, the added amount of these dyes can be 0.01 to 5 parts by mass with respect to 100 parts by mass of the moisture-proof insulating material of the present invention (I).

When it is necessary to suppress oxidative degradation and discoloration during heating of the moisture-proof insulating material of the present invention (I), an antioxidant can be used and is preferable.
The antioxidant is not particularly limited as long as it is a compound capable of preventing thermal deterioration and discoloration of the moisture-proof insulating material of the present invention (I). For example, a phenol-based antioxidant can be used.
Examples of phenolic antioxidants include compounds represented by the following formulas (2) to (12).

A silane coupling agent can be used when a strong adhesion to a glass or metal oxide of a coating film formed by applying the moisture-proof insulating material 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 (13). Indicated.

Here, Y is a functional group reactively bonded to an organic material, and representative examples thereof include a vinyl group, an epoxy group, an amino group, a substituted amino group, a (meth) acryloyl group, a mercapto group, and the like. 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 ³ is a divalent organic group, and R ⁴ 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-acryloyloxypropylmethyldi Toxisilane, 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 Aminopropyltriethoxysilane, 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- Acryloyloxypropyltriethoxysila 3-methacryloyloxypropyltriethoxysilane, 3-acryloyloxypropylmethyldimethoxysilane, 3-methacryloyloxypropylmethyldimethoxysilane, 3-acryloyloxypropylmethyldiethoxysilane, 3-methacryloyloxypropylmethyldiethoxysilane, etc. Examples of commercially available products include KBM-503 (manufactured by Shin-Etsu Chemical Co., Ltd.), KBM-903 (manufactured by Shin-Etsu Chemical Co., Ltd.), and KBE-903 (stock of Shin-Etsu Chemical Co., Ltd.). Company-made), 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 give adhesion to a glass substrate suitable for the moisture-proof insulating material of the present invention (I), the amount of the silane coupling agent is 0.1 to 10 with respect to 100 parts by mass of the styrene thermoplastic elastomer. The amount is preferably part by mass, and more preferably 0.5 to 8 parts by mass.

The present invention (II) is an electronic component that is insulated using the moisture-proof insulating material of the present invention (I). Examples of such electronic components include microcomputers, transistors, capacitors, resistors, relays, transformers, etc., and mounting circuit boards on which these are mounted, and lead wires, harnesses, and film substrates that are joined to these electronic components. Etc. 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 (I) can be preferably used in IC peripheral parts such as display boards for electronic parts, panel bonding parts, and the like.

The electronic component of the present invention (II) is manufactured by insulating the electronic component using a moisture-proof insulating material. As a specific method for producing the electronic component of the present invention (II), first, the above-described moisture-proof insulating material is applied to the electronic component by a generally known method such as dipping, brushing, spraying, or drawing. The electronic component can be obtained by applying to the substrate and evaporating the organic solvent contained in the moisture-proof insulating material and drying the coating film.

Hereinafter, the present invention will be described more specifically by way of examples. However, the present invention is not limited only to the following examples.

Example 1
25 g of D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) as a styrene-butadiene block copolymer elastomer, and Quinton (registered trademark) D100 (aliphatic-aromatic copolymer petroleum resin made by Nippon Zeon Co., Ltd.) as a tackifier 6.1 g, 71.0 g of methylcyclohexane (manufactured by Maruzen Petrochemical Co., Ltd., trade name: Suwaclean MCH) as a solvent, 5.8 g of ethylcyclohexane (manufactured by Maruzen Petrochemical Co., Ltd .: trade name: Suwaclean ECH), diethyl carbonate (Mitsui (Chemical Fine Co., Ltd.) 3.2g was mixed and it was set as the compound D1.
The viscosity of the formulation D1 at 25 ° C. was 0.68 Pa · s.

Example 2
22.5 g of D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) as a styrene-butadiene block copolymer elastomer, 5.5 g of Quinton (registered trademark) D100 (made by Nippon Zeon Co., Ltd.) as a tackifier, and methylcyclohexane as a solvent (Maruzen Petrochemical Co., Ltd., trade name: Suwaclean MCH) 60.0 g, ethylcyclohexane (Maruzen Petrochemical Co., Ltd., trade name: Swaclean ECH) 8.0 g, diethyl carbonate (Mitsui Chemicals Fine Co., Ltd.) 4. 0 g was mixed to make Formulation D2.
The viscosity of the formulation D2 at 25 ° C. was 0.67 Pa · s.

Example 3
22.5 g of D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) as a styrene-butadiene block copolymer elastomer, 5.5 g of Quinton (registered trademark) D100 (made by Nippon Zeon Co., Ltd.) as a tackifier, and methylcyclohexane as a solvent (Maruzen Petrochemical Co., Ltd., trade name: Suwaclean MCH) 56.0 g, ethylcyclohexane (Maruzen Petrochemical Co., Ltd., trade name: Suwaclean ECH) 8.0 g, dimethyl carbonate (Ube Industries, Ltd.) 4.0 g Then, 4.0 g of diethyl carbonate (manufactured by Mitsui Chemicals Fine Co., Ltd.) was mixed to obtain a formulation D3.
The viscosity of the formulation D3 at 25 ° C. was 0.62 Pa · s.

Example 4
22.5 g of D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) as a styrene-butadiene block copolymer elastomer, 5.5 g of Quinton (registered trademark) D100 (made by Nippon Zeon Co., Ltd.) as a tackifier, and methylcyclohexane as a solvent (Maruzen Petrochemical Co., Ltd., trade name: Swaclean MCH) 68.0 g and diethyl carbonate (Mitsui Chemicals Fine Co., Ltd.) 4.0 g were mixed to obtain a compound D4.
The viscosity of the formulation D4 at 25 ° C. was 0.67 Pa · s.

Comparative Example 1
20 g of D1161 (manufactured by Kraton Polymer Co., Ltd., styrene content 15% by mass) as a styrene-isoprene block copolymer elastomer, and Imabe (registered trademark) P-100 (manufactured by Idemitsu Kosan Co., Ltd., based on C5 fraction as a tackifier) Hydrogenated petroleum resin of dicyclopentadiene / aromatic copolymer system, P grade has a hydrogenation (hydrogenation) rate higher than S grade) 10 g, N-2- (aminoethyl) -3 as silane coupling agent -Compound 1 was prepared by mixing 1 g of aminopropylmethyldimethoxysilane (trade name: KBM-602, manufactured by Shin-Etsu Chemical Co., Ltd.) and 70 g of ethylcyclohexane (trade name: Suwaclean ECH, manufactured by Maruzen Petrochemical Co., Ltd.) as a solvent. .
The viscosity of Formulation E1 at 25 ° C. was 1.11 Pa · s.

Comparative Example 2
20 g of G1652 (manufactured by Kraton Polymer, styrene content 30% by mass) and 20 g of styrene-butadiene block copolymer elastomer D1101 (manufactured by Kraton Polymer, 31% by mass of styrene) as a styrene-ethylene / butylene block copolymer elastomer, tackifier 10 g of I-MAB (registered trademark) P-100 (manufactured by Idemitsu Kosan Co., Ltd., dicyclopentadiene / aromatic copolymer hydrogenated petroleum resin mainly containing C5 fraction), N-2- as a silane coupling agent 1 g of (aminoethyl) -3-aminopropylmethyldimethoxysilane (trade name: KBM-602, manufactured by Shin-Etsu Chemical Co., Ltd.) and 70 g of ethylcyclohexane (trade name: Suwaclean ECH, manufactured by Maruzen Petrochemical Co., Ltd.) as a solvent were mixed. Formulation E2.
The viscosity at 25 degreeC of the compound E2 was too high, and could not be measured on the said viscosity measurement conditions.

Comparative Example 3
25 g of D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) as a styrene-butadiene block copolymer elastomer, and Quinton (registered trademark) D100 (aliphatic-aromatic copolymer petroleum resin made by Nippon Zeon Co., Ltd.) as a tackifier 6.1 g and 80 g of ethylcyclohexane (manufactured by Maruzen Petrochemical Co., Ltd., trade name: SWACLEAN ECH) as a solvent were mixed to obtain a formulation E3.
The viscosity of the formulation E3 at 25 ° C. was 0.88 Pa · s.

Comparative Example 4
22.5 g of D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) as a styrene-butadiene block copolymer elastomer, 5.5 g of Quinton (registered trademark) D100 (made by Nippon Zeon Co., Ltd.), and ethylcyclohexane as a solvent (Maruzen Petrochemical Co., Ltd., trade name: Swaclean ECH) 64 g and n-butyl acetate (Kyowa Hakko Chemical Co., Ltd., trade name: butyl acetate-P) 8 g were mixed to obtain a blend E4.
The viscosity in 25 degreeC of the compound E4 was 0.66 Pa.s.

Comparative Example 5
22.5 g of D1155 (manufactured by Kraton Polymer Co., Ltd., styrene content 40 mass%) as a styrene-butadiene block copolymer elastomer, 3.0 g of Quinton (registered trademark) D100 (manufactured by Nippon Zeon Co., Ltd.) and Imabe (registered trademark) as a tackifier ) S-110 (manufactured by Idemitsu Kosan Co., Ltd., 2.5 g of dicyclopentadiene / aromatic copolymer hydrogenated petroleum resin mainly containing C5 fraction), ethylcyclohexane (manufactured by Maruzen Petrochemical Co., Ltd.) Name: Swaclean ECH) 64 g and n-butyl acetate (trade name: butyl acetate-P, manufactured by Kyowa Hakko Chemical Co., Ltd.) 8 g were mixed to obtain a compound E5.
The viscosity in 25 degreeC of the compound E5 was 0.68 Pa.s.

Comparative Example 6
22.5 g of D1161 (manufactured by Kraton Polymer, styrene content: 15% by mass) as a styrene-isoprene block copolymer elastomer, 5.5 g of Quinton (registered trademark) D100 (manufactured by ZEON Corporation) as a tackifier, and ethylcyclohexane as a solvent (Maruzen Petrochemical Co., Ltd., trade name: Swaclean ECH) 67 g and n-butyl acetate (Kyowa Hakko Chemical Co., Ltd., trade name: butyl acetate-P) were mixed to obtain a formulation E6.
The viscosity in 25 degreeC of the compound E6 was 1.22 Pa.s.

Comparative Example 7
25 g of D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) as a styrene-butadiene block copolymer elastomer, 6.1 g of Quinton (registered trademark) D100 (made by Nippon Zeon Co., Ltd.) as a tackifier, and ethylcyclohexane (Maruzen) as a solvent 98.5 g of Petrochemical Co., Ltd. trade name: SWACLEAN ECH) was mixed to prepare a compound E7.
The viscosity in 25 degreeC of the compound E7 was 0.32 Pa.s.

Comparative Example 8
25 g of D1155 (made by Kraton Polymer Co., Ltd., styrene content 40% by mass) as a styrene-butadiene block copolymer elastomer, and Quinton (registered trademark) D100 (aliphatic-aromatic copolymer petroleum resin made by Nippon Zeon Co., Ltd.) as a tackifier 6.1 g and 80 g of methylcyclohexane (manufactured by Maruzen Petrochemical Co., Ltd., trade name: SWACLEAN MCH) as a solvent were mixed to obtain a formulation E8.
The viscosity in 25 degreeC of the compound E8 was 0.72 Pa.s.

[Evaluation of formulation]
The characteristics of the blends D1 to D4 and E1, E3 to E8 prepared with the above compositions were evaluated by the following methods. 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 tack free time>
The tack free time was evaluated by the following method.
Formulations D1 to D4 and Formulations E1 and E3 to E8 were each coated on glass using an automatic dispenser so that the thickness after drying was about 350 μm. After coating, the coating surface was checked for stickiness for 30 seconds. Each was confirmed by finger 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.
In addition, the formulation E2 was too high in viscosity and could not be applied with an automatic dispenser.

<Evaluation of presence or absence of spinnability>
The presence or absence of spinnability was evaluated by the following method.
Formulations D1 to D4 and Formulations E1 and E3 to E8 were each applied onto a glass using a dispenser so that the thickness after drying was about 350 μm. At the end of the application, the coating liquid was applied to the tip of the dispenser. Judgment was made based on whether or not it became a filament.
A: No filamentous coating solution is generated.
○: A thread-like coating liquid may or may not be generated.
X: A filamentous coating solution is always generated.

<Evaluation of adhesion to glass and peelability from glass>
The adhesion to glass was evaluated by the following method.
Formulations D1 to D4 and Formulations E1 and E3 to E8 were each coated on glass so that the thickness after drying was 130 μm, held at room temperature for 10 minutes, and then dried at 70 ° C. for 0.5 hours. Left at room temperature for 12 hours. About these coating films, only the end of the cured film for evaluation tests was peeled off, and a test piece for measuring adhesive strength having a width of 2.5 mm was produced. The adhesive force is fixed to a tensile tester (manufactured by Shimadzu Corporation, EZ Test / CE) so that the cured film peeled off from the glass plate forms an angle of 90 degrees, and the initial distance between chucks is 2.5 cm. The 90-degree peel strength was measured at 23 ° C. at a speed of 50 mm / min.
In addition, “X” in “peelability” means that the cured film was cut during measurement of 90-degree peel strength, and “◯” in “peelability” means 90-degree peel strength. It means that the cured film could be peeled off without being cut during the measurement.
A certain level of adhesion is necessary to maintain moisture resistance and insulation reliability, but if there is a defect in the LCD panel pre-shipment inspection, the glass panel will be reused (the flexible wiring board will be discarded). When it is desired to peel off the film, it is preferable that the film can be peeled off without breaking the coating film.

<Evaluation of adhesion to polyimide film and evaluation of peelability from polyimide>
The adhesion to the polyimide film was evaluated by the following method.
Formulations D1 to D4 and Formulations E1 and E3 to E8 were respectively applied onto a polyimide film (trade name: Kapton (registered trademark) 150EN, manufactured by Toray DuPont Co., Ltd.) so that the thickness after drying was 130 μm. After holding at room temperature for 10 minutes, it was dried at 70 ° C. for 0.5 hour and then allowed to stand at room temperature for 12 hours. Then, the board (henceforth a "polyimide film sticking epoxy resin board") which bonded the surface in which this compound of polyimide film was not apply | coated, and the epoxy resin board containing glass cloth with the double-sided adhesive tape was produced. About these coating films, only the end of the cured film for evaluation tests was peeled off, and a test piece for measuring adhesive strength having a width of 2.5 mm was produced. The adhesive force is fixed to a tensile tester (manufactured by Shimadzu Corporation, EZ Test / CE) so that the cured film peeled off from the polyimide resin-attached epoxy resin plate forms an angle of 90 degrees. The peel strength was determined by measuring 90 ° at a speed of 50 mm / min at 23 ° C. and 2.5 cm. The results are shown in Table 1.
In addition, “X” in “peelability” means that the cured film was cut during measurement of 90-degree peel strength, and “◯” in “peelability” means 90-degree peel strength. It means that the cured film could be peeled off without being cut during the measurement.

<Water vapor permeability evaluation>
A self-supporting film was formed by overcoating the compounds D1 to D4 and the compounds E1 and E3 to E8 on a Teflon (registered trademark) plate using a bar coater so that the thickness after drying was about 130 μm. Produced.
Using a moisture permeable cup jig (manufactured by Tester Sangyo Co., Ltd.), the moisture permeability of these free-standing films was measured in accordance with JIS Z0208.
The test conditions for moisture permeability were a temperature of 40 ° C., a humidity of 90% RH, and 24 hours.

<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 / copper wiring width = 15 μm / 15 μm) The coatings D1 to D4, E1, and E3 to E8 were each applied to a flexible wiring board that had been subjected to tin plating so that the thickness after drying would be 100 μm. After being kept at room temperature for 10 minutes, it was 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 the conditions of a temperature of 85 ° C. and a humidity of 85% RH was performed using MIGRATION TESTER MODEL MIG-8600 (manufactured by IMV). Table 1 shows resistance values 1000 hours after the start of the temperature and humidity steady test.

<Evaluation of long-term insulation reliability using wiring on glass substrate>
The composition D1 to D4 and E1, E3 to E8 are each dried to a thickness of 100 μm on a patterned electrode in which a comb-shaped ITO wiring having a line / space of 40 μm / 10 μm is formed on a glass substrate. After coating and holding at room temperature for 10 minutes, it was 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 the conditions of a temperature of 85 ° C. and a humidity of 85% RH was performed using MIGRATION TESTER MODEL MIG-8600 (manufactured by IMV). The resistance values 1000 hours after the start and start of the temperature and humidity steady test are shown in Table 1.

From the results shown in Table 1, it can be seen that the compounds D1 to D4 are excellent in drying property, adhesion to a glass substrate, and long-term insulation reliability, and have a low viscosity of 1.2 Pa · s or less. . On the other hand, the formulation E2 has a high viscosity and poor handling properties, and the formulations E1, E3 to E8 are inferior in drying rate or always generate a filamentous coating liquid. It can be seen that the product is suitable for a moisture-proof insulating material to be applied using a dispenser.

The moisture-proof insulating material of the present invention is a composition that can exhibit low viscosity and quick drying properties, and by coating with this moisture-proof insulating material, it is possible to obtain an electronic component that is highly moisture-proof and insulated.

Claims

A moisture-proof insulating material comprising a styrene-based thermoplastic elastomer, a tackifier, and a solvent, wherein the solvent has a boiling point of 80 ° C. or higher and lower than 110 ° C. and formula (1)

(In Formula (1), R 1 and R 2 each independently represents a methyl group or an ethyl group.)
A moisture-proof insulating material comprising a solvent comprising a dialkyl carbonate represented by the formula:
The moisture-proof insulating material according to claim 1, wherein the solvent further contains an aliphatic hydrocarbon solvent having a boiling point of 110 ° C or higher and lower than 140 ° C.
The mass ratio of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. to less than 110 ° C. and the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. to less than 140 ° C. contained in the moisture-proof insulating material is 65:35 to 97: The moisture-proof insulating material according to claim 2, which is in a range of 3.
The total amount of the aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. and the aliphatic hydrocarbon solvent having a boiling point of 110 ° C. or more and less than 140 ° C. contained in the moisture-proof insulating material is expressed by the formula (1). The moisture-proof insulating material according to any one of claims 1 to 3, wherein the mass ratio of the solvent comprising dialkyl carbonate is in the range of 85:15 to 98: 2.
The moisture-proof insulating material according to any one of claims 1 to 4, wherein the aliphatic hydrocarbon solvent having a boiling point of 80 ° C or higher and lower than 110 ° C is cyclohexane and / or methylcyclohexane.
Aliphatic hydrocarbon solvents having boiling points of 110 ° C. or more and less than 140 ° C. are cis-1,2-dimethylcyclohexane, cis-1,3-dimethylcyclohexane, cis-1,4-dimethylcyclohexane, trans-1,2, 6. At least one member selected from the group consisting of dimethylcyclohexane, trans-1,3-dimethylcyclohexane, trans-1,4-dimethylcyclohexane and ethylcyclohexane. The moisture-proof insulating material as described in 1.
The total amount of styrenic thermoplastic elastomer and tackifier is 20 to 40% by mass, and the total amount of solvent is 60 to 80% by mass with respect to the total mass of the moisture-proof insulating material. An aliphatic hydrocarbon solvent having a boiling point of 80 ° C. or more and less than 110 ° C. contained in the moisture-proof insulating material, wherein the mass ratio of the thermoplastic elastomer to the tackifier is in the range of 2: 1 to 10: 1 and the formula ( 1) The total amount of the solvent consisting of the dialkyl carbonate represented by 1) is 65% by mass or more based on the total amount of the solvent, and the moisture-proof insulating material has a viscosity at 25 ° C. of 1.2 Pa · s or less. The moisture-proof insulating material according to any one of claims 1 to 6, characterized in that:
The styrenic thermoplastic elastomer is at least selected from the group consisting of a styrene-butadiene block copolymer elastomer, a styrene-isoprene block copolymer elastomer, a styrene-ethylene / butylene block copolymer elastomer, and a styrene-ethylene / propylene block copolymer elastomer. The moisture-proof insulating material according to any one of claims 1 to 7, wherein the moisture-proof insulating material is one kind.
9. The content of structural units derived from styrene contained in the styrenic thermoplastic elastomer is 15 to 50% by mass with respect to the total amount of the styrenic thermoplastic elastomer. The moisture-proof insulating material as described in 1.
The moisture-proof insulating material according to any one of claims 1 to 9, wherein the tackifier is a petroleum resin tackifier.
An electronic component insulated using the moisture-proof insulating material according to any one of claims 1 to 10.