JP6445198B1 - Black shielding material for ink jet and cured product thereof - Google Patents

Abstract

To provide a black shielding material for ink jet which can prevent discoloration and deterioration of adhesiveness in an environment exposed to strong ultraviolet rays or the like under a high temperature environment.
A black shielding material for inkjet according to the present invention includes an epoxy compound having no aromatic ring, a photoacid generator, a coupling agent, a black pigment, and a diluent, and the photoacid generator is an iodonium salt, The epoxy compound includes a monofunctional and bifunctional or higher functional epoxy compound.
[Selection figure] None

Description

  The present invention relates to an inkjet black shielding material and a cured product thereof.

  Usually, a liquid crystal display provided in a car navigation system or the like includes an ITO film pattern formed in an image display region and a metal wiring in its peripheral portion. And the shielding part is provided in the inner peripheral part of the cover glass so that this metal wiring may not be visually recognized by the user.

This shielding part is composed of a cured product obtained by, for example, applying an inkjet black shielding material containing a black pigment to the inner peripheral portion of the cover glass, forming a coating film, and irradiating it with actinic rays. Yes.
In general, a black shielding material for inkjet can form a highly smooth coating film and a shielding portion without causing streaks or a skin-like pattern caused by uneven coating (hereinafter, coating unevenness prevention property). And a shielding part having a high OD value is required.

  Here, Patent Document 1 discloses an inkjet ink composition comprising a photosensitive compound, an arylsulfonium salt as a photopolymerization initiator, an organic solvent having a boiling point in a specific range, and a charge adjusting agent. An ink composition having a viscosity is disclosed.

JP 2013-23555 A

  However, the shielding part formed by using a conventionally known ink composition proposed by Patent Document 1 or the like is discolored over time in a high temperature environment or an environment exposed to strong ultraviolet rays or the like, resulting in a decrease in adhesion. There was a problem that. In particular, in summer, discoloration and adhesion are likely to occur due to direct sunlight and the greenhouse effect.

Accordingly, an object of the present invention is to provide a black shielding for inkjet that has high coating unevenness prevention and shielding properties, and can prevent discoloration and deterioration of adhesion in a high temperature environment and an environment exposed to strong ultraviolet rays. Is to provide materials.
Another object of the present invention is to provide a cured product formed using the inkjet black shielding material.

  The inkjet black shielding material according to the present invention includes an epoxy compound having no aromatic ring, a photoacid generator, a coupling agent, a black pigment, and a diluent, the photoacid generator is an iodonium salt, and the aromatic ring As an epoxy compound which does not have, it is characterized by including a monofunctional and bifunctional or more epoxy compound.

  In the aspect of the present invention, the epoxy compound is preferably an alicyclic epoxy compound.

In embodiments of the present invention, the anionic portion of the photo-acid generating agent, PF ₆ ^- there are preferably der.

  In the embodiment of the present invention, the coupling agent is preferably a silane coupling agent having an epoxy group.

  In the embodiment of the present invention, the black pigment is preferably carbon black.

  In the embodiment of the present invention, the diluent is preferably a non-reactive acetate solvent.

  The cured product according to the present invention is obtained by curing the inkjet black shielding material.

According to the present invention, it has high coating unevenness prevention and shielding properties, and has high discoloration prevention and adhesion reduction prevention (hereinafter simply referred to as discoloration prevention and It is possible to provide a black shielding material for ink jet having an adhesive strength lowering prevention property.
Moreover, according to another aspect of this invention, the hardened | cured material formed using the said black shielding material for inkjets can be provided.

[Black shielding material for inkjet]
The black shielding material for inkjet according to the present invention includes an epoxy compound having no aromatic ring, a photoacid generator, a coupling agent, a black pigment, and a diluent.

  The viscosity of the black shielding material for inkjet at 25 ° C. is preferably 1 to 50 mPa · s, and more preferably 5 to 30 mPa · s. By making the viscosity of the black shielding material for inkjet within the above numerical range, the inkjet printing suitability of the black shielding material for inkjet can be improved. In the present invention, the viscosity of the black shielding material for inkjet can be measured according to JIS K 2283.

The ink-jet black shielding material of the present invention is applied onto a glass plate, wood or paper, etc. by an ink-jet method, a coater method, a dispenser method, a spray method or a gravure printing method, and a coating film is formed thereon. On the other hand, by irradiating an active energy ray, it can be hardened and a shielding part can be formed. From the viewpoint of shielding properties, the OD value of the shielding part having a thickness of 2 μm is preferably 1 or more, and more preferably 1.5 or more.
In the present invention, the OD value can be calculated based on the equation OD value = −log ₁₀ (T / 100) by measuring the amount of transmitted light using a transmission densitometer (X-Rite, 361T). it can.
In the present invention, active energy rays include those that can generate radically active species such as ultraviolet rays, electron beams, X rays, α rays, β rays, γ rays, microwaves, and high frequencies.

  Hereinafter, various materials included in the black shielding material for inkjet according to the present invention will be described.

[Epoxy compound]
The epoxy compound contained in the black shielding material for inkjet according to the present invention is characterized by containing a monofunctional epoxy compound and a bifunctional or higher functional epoxy compound each having no aromatic ring. When the black shielding material for inkjet contains such two kinds of epoxy compounds, it is possible to improve the coating unevenness prevention property and to remarkably improve the adhesion strength reduction prevention property.
In the present invention, the aromatic ring means a benzene ring, a naphthalene ring, or an anthracene ring.
Examples of the epoxy compound include an alicyclic epoxy compound, an aliphatic epoxy compound, a norbornene type epoxy compound, a hydrogenated bisphenol type compound, and the like.
From the viewpoint of discoloration prevention properties and adhesion strength reduction prevention properties of the inkjet black shielding material, the monocyclic epoxy compound having no aromatic ring is preferably an alicyclic or aliphatic epoxy compound.
From the viewpoint of discoloration prevention and adhesion strength reduction prevention of the black shielding material for inkjet, the bifunctional or higher functional epoxy compound having no aromatic ring is preferably an alicyclic epoxy compound.
The black shielding material for inkjet may contain two or more types of monofunctional and bifunctional or higher functional epoxy compounds.

The alicyclic epoxy compound is a compound having at least one saturated or unsaturated carbocyclic ring having no aromaticity and not having an aromatic ring. For example, a compound having a cyclohexene oxide group is preferable.
Bifunctional or higher alicyclic epoxy compounds include 3 ', 4'-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, 1-methyl-4- (2-methyloxiranyl) -7-oxa Bicyclo [4.1.0] heptane, (3,3 ′, 4,4′-diepoxy) bicyclohexyl, 2- (3,4-epoxycyclohexyl-5,5-spiro-3,4-epoxy) cyclohexane -Meta-dioxane, bis (3,4-epoxycyclohexylmethyl) adipate, vinylcyclohexene dioxide, bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate, 3,4-epoxy-6-methylcyclohexyl-3 , 4-epoxy-6-methylcyclohexanecarboxylate, methylenebis (3,4-epoxy Hexane), dicyclopentadiene diepoxide, ethylene glycol di (3,4-epoxycyclohexylmethyl) ether, ethylene bis (3,4-epoxycyclohexanecarboxylate), and hydrogenated bisphenol A diglycidyl ether.
Examples of the monofunctional alicyclic epoxy compound include 1,2-epoxy-4-vinylcyclohexane.

  The aliphatic epoxy compound is an aliphatic epoxy compound having no alicyclic structure. Examples of the bifunctional or higher aliphatic epoxy compound include ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, and propylene glycol. Examples include diglycidyl ether, dipropylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and glycerin triglycidyl ether. Examples of the monofunctional aliphatic epoxy compound include allyl glycidyl ether, 2-ethylhexyl glycidyl ether, lauryl alcohol glycidyl ether, and the like.

The bifunctional or higher alicyclic epoxy compound having no aromatic ring may be a commercially available product, for example, Celoxide 2021P, Celoxide 2081, Celoxide 3000, Celoxide 8000, EHPE3150, Cyclomer M-100, Epolide Examples include GT301, Epolide GT302, Epolide GT401, Epolide GT403 (manufactured by Daicel Corporation), YX-8000, and YX-8034 (manufactured by Mitsubishi Chemical Corporation) Sunsizer E-PS.
Examples of the monofunctional alicyclic epoxy compound having no aromatic ring include Celoxide 2000 (manufactured by Daicel Corporation) E0956 (manufactured by Tokyo Chemical Industry Co., Ltd.).

The bifunctional or higher aliphatic epoxy compound having no aromatic ring may be a commercially available product, such as Epolite 40E, Epolite 100E, Epolite 70P, Epolite 200P, Epolite 400P (manufactured by Kyoeisha Chemical Co., Ltd.), etc. Is mentioned.
Examples of the monofunctional epoxy compound having no aromatic ring include EX-111, EX-121, EX-171, and EX-191 (manufactured by Nagase ChemteX Corporation).

  The content of the epoxy compound in the black shielding material for inkjet is preferably 30 to 80% by mass, and more preferably 40 to 70% by mass. Thereby, the discoloration prevention property and adhesion-proof fall prevention property of the black shielding material for inkjet can be improved more.

  The ratio of the monofunctional epoxy compound to the bifunctional or higher functional epoxy compound is preferably 1:99 to 90:10, more preferably 10:90 to 50:50 on a mass basis. Thereby, the discoloration prevention property and adhesion-proof fall prevention property of the black shielding material for inkjet can be improved more.

[Photoacid generator]
The photoacid generator has a cation portion that is a light absorption portion and an anion portion that is an acid generation portion, and the photoacid generator contained in the black shielding material for inkjet according to the present invention is an iodonium ion. The iodonium salt-based photoacid generator. In addition, in the range which does not impair the characteristic of this invention, the black shielding material for inkjets may contain the non-iodonium salt type photo-acid generator.

Examples of the anion portion of the photoacid generator include PF ₆ ⁻ , BF ₆ ^— and SbF ₆ ^— . Among these, PF ₆ ⁻ is preferable from the viewpoint of preventing adhesion strength reduction.

Thus, the photoacid generator, the anionic portion PF ₆ ^- is preferably an aromatic iodonium salt and, for example, 4-isobutylphenyl (4-methylphenyl) iodonium hexafluorophosphate, bis (4-tert-butyl Phenyl) iodonium hexafluorophosphate, diphenyliodonium hexafluorophosphate, and the like.
The inkjet black shielding material may contain two or more photoacid generators.

  The photo acid generator may be a commercially available product, for example, Omnicat 250 (manufactured by IGM Resins), B2380, D2238 (manufactured by Tokyo Chemical Industry Co., Ltd.) and WPI-113, WPI-170 (or more). And Wako Pure Chemical Industries, Ltd.).

  The content of the photoacid generator in the black shielding material for inkjet is preferably 3 to 15% by mass, and more preferably 4 to 10% by mass. Thereby, the discoloration prevention property and the adhesive force fall prevention property of the black shielding material for inkjets by this invention can be improved more.

[Coupling agent]
The black shielding material for inkjet according to the present invention contains a coupling agent. Examples of the coupling agent include a silane coupling agent, a titanium coupling agent, a zirconium coupling agent, and an aluminum coupling agent. Among these, a silane coupling agent is preferable from the viewpoint of adhesion to glass or the like. The black shielding material for inkjet may contain 2 or more types of coupling agents.

  The coupling agent may have an organic group such as an epoxy group, an amino group, a mercapto group, and an isocyanate group. Among these, it is preferable that the coupling agent has an epoxy group from the viewpoint of preventing adhesion strength reduction.

  Therefore, the coupling agent is preferably a silane coupling agent having an epoxy group, such as 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, Examples include 3-glycidoxypropylmethyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 3-glycidoxypropyltrimethoxysilane.

  The coupling agent may be a commercially available product, and examples thereof include KBM-303, KBM-402, KBM-403, KBE-402 and KBE-403 (manufactured by Shin-Etsu Chemical Co., Ltd.). .

  The content of the coupling agent in the black shielding material for inkjet is preferably 0.1 to 5% by mass, and more preferably 1 to 4% by mass. Thereby, adhesive force fall prevention property can be improved, maintaining the sclerosis | hardenability and inkjet aptitude of the inkjet black shielding material by this invention.

[Black pigment]
The black pigment may be an inorganic pigment or an organic pigment, and examples thereof include inorganic pigments such as carbon black, iron trioxide, black titanium oxide, copper manganese black, copper chrome black and cobalt black, and cyanine. Organic pigments such as black and aniline black are listed. Further, in the present invention, a black pigment mixture is also included in a black pigment mixture obtained by mixing a plurality of color pigments.
Among the above-mentioned, carbon black is preferable from the viewpoint of the adhesive force reduction preventing property. Further, by using carbon black, it is possible to form a highly smooth shielding part in which no streak or yuzu skin-like pattern is formed. Furthermore, the OD value of the shielding part can be improved, and the shielding property can be further improved.
The inkjet black shielding material can contain two or more black pigments.

  The black pigment content in the inkjet black shielding material is preferably 5 to 10% by mass, and more preferably 6 to 8% by mass. Thereby, the shielding property of the shielding part formed can be improved more, maintaining the inkjet suitability of the black shielding material for inkjets by this invention.

[Diluent]
The black shielding material for inkjet according to the present invention contains a diluent, whereby the viscosity of the black shielding material for inkjet can be adjusted and ink jet printing suitability can be improved. The black shielding material for inkjet can contain 2 or more types of diluents.

  The diluent may be a reactive diluent that participates in the polymerization reaction or a non-reactive diluent that does not participate in the polymerization reaction, but a non-reactive diluent is preferred from the viewpoint of inkjet coating properties.

As the non-reactive diluent, known and commonly used diluents can be used, for example, propylene glycol monomethyl ether acetate, ethylene glycol monobutyl ether acetate, carbitol acetate, dipropylene glycol monomethyl ether acetate, methyl acetate, ethyl acetate, Examples include isopropyl acetate, butyl acetate, acetone, methyl ethyl ketone, and cyclohexane.
Among the diluents described above, acetate-based diluents are preferable, acetate-based diluents having a boiling point of more than 100 ° C. are more preferable, and acetate-based diluents having a boiling point of more than 130 ° C. are more preferable. Thereby, the smoothness of the shielding part formed can be improved more. That is, among the above-mentioned diluents, propylene glycol monomethyl ether acetate, ethylene glycol monobutyl ether acetate, carbitol acetate, dipropylene glycol monomethyl ether acetate and butyl acetate are preferable.
Further, among these, propylene glycol monomethyl ether acetate, ethylene glycol monobutyl ether acetate and carbitol acetate are preferable from the viewpoint of ink jet printing suitability.
In addition, you may use together the diluent whose boiling point exceeds 100 degreeC, and the diluent whose boiling point is 100 or less.

  As the reactive diluent, known and conventional ones can be used. For example, dicyclopentanyl (meth) acrylate, isoboronyl (meth) acrylate, 1,4-cyclohexanedimethanol (meth) acrylate, acryloylmorpholine, 2- (2-ethoxyethoxy) ethyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, methoxytriethylene glycol (meth) acrylate, 2-ethoxyethyl (meth) acrylate, ethoxyethoxyethyl (meth) acrylate, methoxy Dipropylene glycol (meth) acrylate, methoxypolypropylene glycol (meth) acrylate, dipropylene glycol (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl Meth) acrylate and 4-hydroxybutyl (meth) acrylate.

  The content of the diluent in the inkjet black shielding material is not particularly limited, and is preferably changed as appropriate according to various constituent materials contained in the inkjet black shielding material. It can be.

[Pigment dispersant]
The black shielding material for inkjet according to the present invention may contain a pigment dispersant. Thereby, the inkjet printability of the black shielding material for inkjet can be improved. Examples of the pigment dispersant include polyoxyethylene hydrogenated castor oil, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene olein ether, polyoxyethylene stearyl ether, polyoxyethylene beenyl ether, polyisobaie and olein. An acid decaglycel etc. are mentioned. The inkjet black shielding material can contain two or more pigment dispersants.

  The content of the pigment dispersant in the black shielding material for inkjet is preferably 0.1 to 3% by mass, and more preferably 1 to 2% by mass. Thereby, the inkjet suitability of the black shielding material for inkjet can be improved more.

[Additive]
The black shielding material for inkjet is a pigment dispersant, oxygen scavenger, fluorescent whitening agent, surfactant, antioxidant, plasticizer, flame retardant, antistatic agent and antibacterial agent as long as the properties of the present invention are not impaired. Etc. can be included.

  The black shielding material for inkjet of the present invention is suitably used for forming a bezel pattern in a thin film form in a display device from the viewpoint of achieving both thin film formation and concealment of circuit wiring located on the outer periphery of the substrate. The coating method is preferably applied using an inkjet method. The reason for this is that the manufacturing cost for pattern formation is low compared to the case of the photolithography method, the process is not complicated, and the fine pattern can be formed without restriction compared to the screen printing method. Can be mentioned.

  EXAMPLES Next, although an Example is given and this invention is demonstrated still in detail, this invention is not limited to these Examples.

(Examples 1-10 and Comparative Examples 1-4)
[Preparation of black shielding material for inkjet]
Each component described in Table 1 below was blended and stirred to obtain a black shielding material for inkjet. In addition, the numerical value in a table | surface represents the mass%.

(Prevention of uneven coating)
Using a material printer DMP-2831 manufactured by Fuji Global Graphic Systems Co., Ltd., and after forming a coating film on the chemically strengthened glass plate, the inkjet black shielding materials of Examples and Comparative Examples were immediately followed by a high-pressure mercury lamp (manufactured by ORS). , HMW-713) was used to irradiate active energy rays, and the coating film was cured to form a shielding part having a thickness of 2 μm. At this time, the integrated irradiation dose was 1000 mJ / cm ² .
The appearance of the shielding part was visually observed and evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
<Evaluation criteria>
○: No streak or yuzu skin-like pattern was formed on the surface of the shielding part.
Δ: Some streaks and yuzu skin-like patterns were formed on the surface of the shielding part, but there was no practical problem.
X: A lot of streak and yuzu skin-like patterns were formed on the surface of the shielding part.

(Discoloration prevention evaluation)
The shielding part was formed on the chemically strengthened glass plate in the same manner as the appearance evaluation. The chromaticity ([L ^* (1), a ^* (1), b ^* (1)]) of the shielding part was measured with a spectrocolorimeter (Konica Minolta, CM-2600d).
The shielding part was irradiated with light by a super xenon weather meter SX75 under the following conditions.
<Conditions>
Illuminance: 180 W / m ² (300 to 400 nm)
-Irradiation time: 1000 hours-Filter: Inner; Quartz, Outer; # 275
・ BPT: 83 ℃
・ Humidity: 80%
・ Rainfall: None

The chromaticity ([L ^* (2), a ^* (2), b ^* (2)])) of the shielding part after light irradiation is measured in the same manner as described above, and the calculation formula √ ((L ^* (2) −L ^* ( 1)) 2+ (a ^* (2) −a ^* (1)) 2+ (b ^* (2) −b ^* (1)) The color difference ΔEab was determined by 2) and evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
<Evaluation criteria>
○: ΔEab is 5 or less Δ: ΔEab is more than 5, 10 or less ×: ΔEab is more than 10

(Evaluation of adhesion reduction prevention)
In the same manner as the test for preventing discoloration, a shielding part was formed on the chemically strengthened glass plate and then irradiated with light. After the light irradiation, according to the JIS D 0202 test method, five cuts were made at intervals of 1 mm both vertically and horizontally, and 25 squares were formed on the shielding part. Next, an adhesive tape was strongly applied and peeled in the 90 ° direction. The prevention of lowering the adhesion of the black shielding material for inkjet was evaluated based on the following evaluation criteria. The evaluation results are summarized in Table 1.
(Double-circle): The ratio of the peeling area of the shielding part in the area | region (25 mm < ² >) in which the square was formed was less than 5%.
(Circle): The ratio of the peeling area of a shielding part was 5% or more and less than 15%.
(Triangle | delta): The ratio of the peeling area of a shielding part was 15% or more and less than 35%.
X: The ratio of the peeled area of the shielding part was 35% or more.

(Shielding evaluation (OD value))
The shielding part was formed on the chemically strengthened glass plate in the same manner as the appearance evaluation. The OD value of the shielding part was measured with a transmission densitometer (manufactured by X-Rite, 361T). The measurement results are summarized in Table 1.
OD value = -log ₁₀ (T / 100)

・セロキサイド３０００：株式会社ダイセル製、１−メチル−４−（２−メチルオキシラニル）−７−オキサビシクロ［４．１．０］ヘプタン

・セロキサイド８０００：株式会社ダイセル製、（３，３’，４，４’−ジエポキシ）ビシクロへキシル

芳香環を有しない、単官能のエポキシ化合物
・ＥＸ−１２１：ナガセケムテックス製、２−エチルヘキシルグリシジルエーテル
芳香環を有するエポキシ化合物
・ＪＥＲ−８２８：三菱ケミカル株式会社製、ビスフェノールＡ型エポキシ化合物
ヨードニウム塩系光重合開始剤
・Ｏｍｎｉｃａｔ ２５０：ＩＧＭ Ｒｅｓｉｎｓ社製、４−イソブチルフェニル（４−メチルフェニル）ヨードニウムヘキサフルオロホスフェート

・Ｂ２３８０：東京化成工業株式会社製、ビス（４−ｔｅｒｔ−ブチルフェニル）ヨードニウムヘキサフルオロホスフェート

・Ｂ５２７６：東京化成工業株式会社製、ビス（４−フルオロフェニル）ヨードニウムトリフルオロメタンスルホナート

・Ｄ２２３８：東京化成工業株式会社製

非ヨードニウム塩系光重合開始剤
・ＣＰＩ−１０１Ａ：サンアプロ株式会社製

・ＤＥＴＸ：日本化薬株式会社製、２，４−ジエチル−９Ｈ−チオキサンテン−９−オン

カップリング剤
・ＫＢＭ−４０３：信越化学工業株式会社製、３−グリシドキシプロピルトリメトキシシラン

・ＫＢＭ−５０２：信越化学工業株式会社製、３−メタクリロキシプロピルメチルジメトキシシラン

・ＫＢＭ−５７３：信越化学工業株式会社製、Ｎ−フェニル−３−アミノプロピルトリメトキシシラン

顔料
・カーボンブラックＭＡ−１００：三菱ケミカル株式会社製
希釈剤
・プロピレングリコールモノメチルエーテルアセテート：沸点１４６℃、非反応性
・エチレングリコールモノブチルエーテルアセテート：沸点１９２℃、非反応性
・カルビトールアセテート：沸点２１８℃、非反応性
・２−ブトキシエタノール：沸点１７０℃、非反応性
・メチルエチルケトン：沸点７９．６４℃、非反応性 The details of each component in Table 1 are as follows.
Bifunctional epoxy compound / ceroxide 2021P having no aromatic ring : manufactured by Daicel Corporation, 3 ′, 4′-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate

Celoxide 3000: manufactured by Daicel Corporation, 1-methyl-4- (2-methyloxiranyl) -7-oxabicyclo [4.1.0] heptane

・ Celoxide 8000: manufactured by Daicel Corporation, (3,3 ′, 4,4′-diepoxy) bicyclohexyl

Monofunctional epoxy compound without aromatic ring , EX-121: manufactured by Nagase ChemteX, 2-ethylhexyl glycidyl ether
Epoxy compound having an aromatic ring JER-828: bisphenol A type epoxy compound manufactured by Mitsubishi Chemical Corporation
Iodonium salt photopolymerization initiator , Omnicat 250: IGM Resins, 4-isobutylphenyl (4-methylphenyl) iodonium hexafluorophosphate

B2380: manufactured by Tokyo Chemical Industry Co., Ltd., bis (4-tert-butylphenyl) iodonium hexafluorophosphate

B5276: manufactured by Tokyo Chemical Industry Co., Ltd., bis (4-fluorophenyl) iodonium trifluoromethanesulfonate

・ D2238: manufactured by Tokyo Chemical Industry Co., Ltd.

Non-iodonium salt photopolymerization initiator CPI-101A: San Apro Co., Ltd.

DETX: Nippon Kayaku Co., Ltd., 2,4-diethyl-9H-thioxanthen-9-one

Coupling agent KBM-403: Shin-Etsu Chemical Co., Ltd., 3-glycidoxypropyltrimethoxysilane

KBM-502: Shin-Etsu Chemical Co., Ltd., 3-methacryloxypropylmethyldimethoxysilane

KBM-573: N-phenyl-3-aminopropyltrimethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd.

Pigment / carbon black MA-100: manufactured by Mitsubishi Chemical Corporation
Diluent・ Propylene glycol monomethyl ether acetate: boiling point 146 ° C., non-reactive ・ Ethylene glycol monobutyl ether acetate: boiling point 192 ° C., non-reactive ・ Carbitol acetate: boiling point 218 ° C., non-reactive ・ 2-butoxyethanol: boiling point 170 ℃, non-reactive, methyl ethyl ketone: boiling point 79.64 ℃, non-reactive

  As is clear from the above results, the black shielding material for inkjet of the present invention has high discoloration prevention property and adhesion strength reduction prevention property while maintaining high OD value with no coating unevenness based on appearance evaluation and density evaluation. You can see that

Claims (7)

Including an epoxy compound having no aromatic ring, a photoacid generator, a coupling agent, a black pigment and a diluent,
The photoacid generator is an iodonium salt;
As no epoxy compound the aromatic ring, the monofunctional and bifunctional or higher epoxy compound seen including,
The monofunctional epoxy compound is at least one of allyl glycidyl ether, 2-ethylhexyl glycidyl ether and lauryl alcohol glycidyl ether;
A black shielding material for inkjet , wherein the ratio of the content of the monofunctional epoxy compound and the content of the bifunctional or higher functional epoxy compound is from 1:99 to 50:50 on a mass basis. .   The black shielding material for inkjet according to claim 1, wherein the bifunctional or higher functional epoxy compound is an alicyclic epoxy compound. Anionic portion of the photo-acid generating agent, PF ₆ ^- and is, ink jet black shielding material according to claim 1 or 2. The black shielding material for inkjet according to any one of claims 1 to 3 , wherein the coupling agent is a silane coupling agent having an epoxy group. The black shielding material for inkjet according to any one of claims 1 to 4 , wherein the black pigment is carbon black. The black shielding material for inkjet according to any one of claims 1 to 5 , wherein the diluent is a non-reactive acetate solvent. Hardened | cured material obtained by hardening the black shielding material for inkjets as described in any one of Claims 1-6 .