TWI461493B - Inkjet ink and application thereof - Google Patents

Description

Inkjet ink and use thereof

The present invention relates to an inkjet ink which is suitably used for producing a display element such as a liquid crystal or an EL, or an electronic circuit board such as a printed wiring board or a flexible wiring board. More specifically, the present invention relates to an inkjet ink suitable for processing a base substrate when a microlens is formed by an inkjet method.

The light guide plate of a liquid crystal display uses a light guide plate in which a microlens is formed on a substrate as a reflection point. Previously, a method of forming a microlens on a substrate was carried out by injection molding using a mold. However, in the method of using injection molding, a mold for designing each product is required, and the cost is very high in the production of a small number of varieties.

Therefore, in recent years, a method of forming a microlens on a substrate at low cost has been carried out by using an inkjet method, but a microlens formed by an inkjet method has a problem that the pattern size and the pattern height are not uniform. In order to improve this problem, it has been proposed to perform water repellency treatment on the substrate. Conventionally, the water repellent treatment of a general substrate has been reported by a coating composition for surface treatment using a fluorine-based polymer (for example, refer to Patent Document 1) or a negative photosensitive composition using polysiloxane. The obtained surface water-repellent cured film (for example, refer to Patent Document 2). However, even if these compositions are used for the water repellent treatment of the substrate for forming the microlens, there is room for improvement from the viewpoint that the amplitude of the unevenness of the pattern of the microlens is sufficiently small.

On the other hand, in order to obtain the release from the mold in the nanoimprint lithography The moldability and the coating suitability to the substrate are reported as a photocurable composition in which a surfactant is blended in a composition containing a polymerizable compound and a polymerization initiator (for example, see Patent Document 3), and polymerizability is included. A photocurable composition in which a surfactant photopolymerization initiator and a surfactant are blended in the composition of the compound and the polymerization initiator (for example, see Patent Document 4). However, the effects of these compositions on the formation of microlenses were not investigated.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2008-050549

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2008-209739

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2008-019292

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2009-051017

Under the circumstances described above, an object of the present invention is to provide an inkjet ink for surface treatment of a substrate which can form a microlens having a small unevenness in pattern diameter and height on a substrate by an inkjet method.

The present inventors have found that the surface treatment of the substrate by the following inkjet ink is useful for forming a microlens having a small unevenness in diameter and height, and the inkjet ink contains a trifunctional (meth) acrylate (A). , a monofunctional (meth) acrylate (B), a photopolymerization initiator (C), and a surfactant (D) having a photocrosslinkable functional group, and obtained by irradiating the ink for inkjet with ultraviolet rays The cured film has a water contact angle of 90° or more and a viscosity of 1 mPa·s to 200 mPa·s, thereby completing the present invention based on the findings.

That is, the present invention includes the following items.

[1] An ink for inkjet comprising a trifunctional (meth) acrylate (A), a monofunctional (meth) acrylate (B), a photopolymerization initiator (C), and a photocrosslinkable functional group The surfactant (D), and the inkjet ink is applied onto the substrate, and the contact angle of water measured at 25 ° C on the surface of the cured film obtained by irradiating ultraviolet rays at an exposure amount of 2000 mJ/cm ² is 90. Above °, the viscosity at 25 ° C is 1 mPa ‧ to 200 mPa ‧ s.

[2] The ink for inkjet according to [1], wherein the trifunctional (meth) acrylate (A) is a compound represented by the formula (1):

(In the formula (1), R ¹ , R ² , R ³ and R ⁴ are each independently hydrogen or an alkyl group having 1 to 6 carbon atoms, and R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently carbon. The number is 1 to 6 alkylene groups, k is 0 or 1, and l, m and n are each independently an integer of 1 to 10).

[3] The ink for inkjet according to [1] or [2], wherein the above-mentioned interface activity The photocrosslinkable functional group of the agent (D) is at least one selected from the group consisting of ethylene oxide, oxetane, acryloyl group and methacryl fluorenyl group.

[4] The inkjet ink according to [3], wherein the photocrosslinkable functional group of the surfactant (D) is an acrylonitrile group and/or a methacryl fluorenyl group.

[5] The inkjet ink according to any one of [1] to [4] wherein the surfactant (D) is a lanthanoid surfactant or a fluorine-based surfactant.

[6] The ink for inkjet according to any one of [1] to [5] wherein 30% by weight (% by weight) to 70% by weight of trifunctional (methyl) is contained with respect to the total weight of the ink for inkjet. ) acrylate (A), 20% by weight to 60% by weight of monofunctional (meth) acrylate (B), 1% by weight to 20% by weight of photopolymerization initiator (C), 0.01% by weight to 10% by weight of surfactant (D).

[7] The inkjet ink according to any one of [2] to [6] wherein R ⁵ , R ⁶ and R ⁷ are each independently an alkylene group having 2 or 3 carbon atoms.

[8] [2] to [7] The inkjet ink according to any one of wherein R ¹ is hydrogen, and k is 0.

[9] The ink for inkjet according to any one of [2] to [8] wherein l, m and n are 1.

[10] The inkjet ink according to any one of [1] to [9] wherein the ester moiety of the monofunctional (meth)acrylate (B) is an alkyl group having 1 to 6 carbon atoms.

[11] The ink for inkjet according to [10], wherein the monofunctional (meth) acrylate (B) is selected from the group consisting of cyclohexyl (meth) acrylate, (methyl) ) n-hexyl acrylate (n-hexyl) (meth)acrylate), n-butyl (meth)acrylate, iso-butyl(meth)acrylate, tert-butyl (meth)acrylate T-butyl (meth)acrylate, n-propyl(meth)acrylate, iso-propyl(meth)acrylate, (methyl) At least one of a group consisting of ethyl (meth)acrylate and methyl (meth)acrylate.

[12] The ink for inkjet according to [11], wherein the monofunctional (meth) acrylate (B) is n-butyl (meth) acrylate.

[13] The ink for inkjet according to any one of [1] to [12] wherein the photopolymerization initiator (C) is α-hydroxyalkylphenone photopolymerization The initiator or acyl phosphine oxide is a photopolymerization initiator.

[14] The ink for inkjet according to [13], wherein the photopolymerization initiator (C) is 2,4,6-trimethylbenzimidyldiphenylphosphine oxide (2,4,6) -trimethylbenzoyl diphenylphosphine oxide).

[15] The ink for inkjet according to any one of [1] to [14] further comprising a polymerization inhibitor (E).

[16] The ink for inkjet according to [15], wherein the polymerization inhibitor (E) is phenothiazine.

[17] The ink for inkjet according to any one of [1] to [16] further comprising a solvent (F).

[18] The ink for inkjet according to [17], wherein the ink is relative to the solvent The total weight of (F) is that the solvent (F) contains 50% by weight or more of a solvent having a boiling point of 120 ° C to 300 ° C and a surface tension of 25 mN/m to 48 mN/m at 25 ° C.

[19] The ink for inkjet according to any one of [1] to [18] which further comprises an epoxy resin (G).

[20] The inkjet ink according to any one of [1] to [19] further comprising a thermosetting compound (H) other than the epoxy resin (G).

[21] The ink for inkjet according to any one of [1] to [20] which further comprises a flame retardant (I).

[22] The ink for inkjet according to any one of [1] to [21] wherein the viscosity at 25 ° C is from 3 mPa ‧ to 100 mPa ‧ s.

[23] A surface water-repellent cured film comprising the crosslinked polymer of the inkjet ink according to any one of [1] to [22].

[24] A method for producing a surface water-repellent cured film, comprising the steps of: (Step 1) applying an inkjet ink according to any one of [1] to [22] onto a substrate by an inkjet method; A coating film is formed on the substrate; and (Step 2) the coating film obtained in the step 1 is irradiated with ultraviolet rays.

[25] A substrate with a microlens, comprising: a substrate, a surface water repellent cured film according to [23] formed on the substrate, and a microlens formed on the surface water repellent cured film.

[26] A method of manufacturing a microlens-attached substrate, comprising the steps of: (Step 1) using the inkjet method according to any one of [1] to [22] The inkjet ink is applied onto the substrate to form a coating film on the substrate; (Step 2) the coating film obtained in the step 1 is irradiated with ultraviolet rays to form a surface water repellent cured film; and (Step 3) obtained in the step 2 On the surface water-repellent cured film, a composition for forming a microlens was applied by an inkjet method to form a dot pattern.

[27] An optical component comprising the microlens-attached substrate according to [25].

[28] A liquid crystal display comprising the optical component according to [27].

When the surface water-repellent cured film is formed on the substrate by using the ink for inkjet of the present invention, and the composition for forming a microlens is coated thereon by an inkjet method, unevenness in diameter and height of the pattern can be formed. Microlens. Further, since the surface water-repellent cured film of the present invention is formed by irradiating ultraviolet rays to the inkjet ink of the present invention, the use of heat for deforming the substrate can be minimized. Therefore, when the ink for inkjet of the present invention is used, it is possible to suitably manufacture a high-quality optical component by a simple and inexpensive manufacturing process.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

<1. Inkjet ink>

Hereinafter, the present invention will be specifically described.

The present invention relates to an ink for inkjet comprising a trifunctional (meth) acrylate (A), a monofunctional (meth) acrylate (B), a photopolymerization initiator (C), and photocrosslinking property. The surfactant-based surfactant (D), and the inkjet ink is applied onto a substrate, and the contact angle of water measured at 25 ° C on the surface of the cured film obtained by irradiating ultraviolet rays at an exposure amount of 2000 mJ/cm ² It is 90° or more, and the viscosity at 25° C. is 1 mPa·s to 200 mPa·s.

The ink for inkjet of the present invention may be colorless or colored. From the viewpoint of transmittance, it is preferably colorless, and a colored compound may be contained in a range that does not impair the effects of the invention. Further, in order to easily recognize the substrate when the cured film is inspected, a coloring agent may be contained.

Further, the inkjet ink of the present invention may contain a polymerization inhibitor (E), a solvent (F), an epoxy resin (G), a thermosetting compound (H) other than an epoxy resin, and a flame retardant (I) as needed. ), other compounds having a radical polymerizable double bond, a coloring agent, and the like. Here, the "other compound having a radical polymerizable double bond" means a radical polymerizable double other than a trifunctional (meth) acrylate (A) and a monofunctional (meth) acrylate (B). The compound of the bond.

In the present specification, "(meth) acrylate" is used to mean either or both of an acrylate and a methacrylate.

Hereinafter, each component described above will be described.

1.1. Trifunctional (meth) acrylate (A)

The inkjet ink of the present invention is excellent in photocurability by using a trifunctional (meth) acrylate (A). Further, the cured film formed of the inkjet ink of the present invention is excellent in adhesion to the substrate and exhibits high transmittance, high strength.

Specific examples of the trifunctional (meth) acrylate include trimethylolpropane tri(meth)acrylate and glycerin tri(meth)acrylate. ), pentaerythritol tri(meth)acrylate, isomeric cyanuric acid EO modified tri(meth)acrylate, and trifunctional (meth) acrylate represented by formula (1) .

Among these trifunctional (meth) acrylates, a trifunctional (meth) acrylate represented by the formula (1) is preferred.

In the formula (1), R ¹ , R ² , R ³ and R ⁴ are each independently hydrogen or an alkyl group having 1 to 6 carbon atoms, and R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently carbon. The number is 1 to 6 alkylene groups, k is 0 or 1, and l, m, and n are each independently an integer of 1 to 10.

In particular, when R ¹ is hydrogen, a methyl group or an ethyl group, and k is 0, the inkjet ink of the present invention has good photocurability, and the obtained cured film exhibits high transmittance and high strength. Preferably. Further, when R ¹ is hydrogen and k is 0, the transmittance of the cured film is further improved, which is more preferable. From the viewpoint of photocurability, R ² , R ³ and R ^{4 are} preferably hydrogen or a methyl group, and more preferably hydrogen. From the viewpoint of the balance between the transmittance and the strength of the obtained cured film, R ⁵ , R ⁶ and R ⁷ are each independently an alkylene group having 2 to 4 carbon atoms, more preferably independently carbon. The number of 2 or 3 alkylene groups is more preferably all ethylene groups. l, m and n are preferably from 1 to 5, more preferably 1.

Specific examples of the trifunctional (meth) acrylate represented by the formula (1) include trimethylolpropane PO modified (3 mole) triacrylate, and trimethylolpropane PO modified (6 moles). Triacrylate, trimethylolpropane PO modified (9 moles) triacrylate, trimethylolpropane EO modified (3 moles) triacrylate, trimethylolpropane EO modified (6 Mo Ear) triacrylate, trimethylolpropane EO modified (9 moles) triacrylate, PO modified (3 moles) glycerol triacrylate, PO modified (6 moles) glycerol triacrylate, PO Modified (9 moles) glycerol triacrylate, EO modified (3 moles) glycerol triacrylate, EO modified (6 moles) glycerol triacrylate, EO modified (9 moles) glycerol triacrylate . In addition, "EO modification" means modification of ethylene oxide, "PO modification" means modification of propylene oxide, and the number of moles in parentheses means addition of ethylene oxide or propylene oxide per molecule. Quantity.

Among these trifunctional (meth) acrylates, especially if trimethylol is used. Propane PO modified (3 mole) triacrylate, EO modified (3 mole) glycerin triacrylate, the inkjet ink of the present invention is excellent in not only photocurability but also transmittance and adhesion to a substrate. A cured film having a good balance of properties and strength is preferred. When EO-modified (3 moles) glycerol triacrylate is used, the cured film has the highest transmittance and is therefore more preferable.

The trifunctional (meth) acrylate (A) may be one type or a mixture of two or more types.

The trifunctional (meth) acrylate (A) described above can be produced by a known method, and a commercially available trifunctional (meth) acrylate can also be used. Commercially available products include, for example, trimethylolpropane PO modified (3 mole) triacrylate (trade name M-310, manufactured by Toagosei Co., Ltd.), and trimethylolpropane PO modified (6 moles). Triacrylate (trade name M-320, manufactured by Toagosei Co., Ltd.), trimethylolpropane EO modified (3 mole) triacrylate (trade name M-350, manufactured by East Asia Synthetic Co., Ltd.), Trimethylolpropane EO modified (6 moles) triacrylate (trade name M-360, manufactured by East Asia Synthetic Co., Ltd.), EO modified (3 moles) glycerol triacrylate (trade name A-GLY- 3E, manufactured by Shin-Nakamura Chemical Industry Co., Ltd., EO-modified (9-mole) glycerin triacrylate (trade name: A-GLY-9E, manufactured by Shin-Nakamura Chemical Industry Co., Ltd.).

When the content of the trifunctional (meth) acrylate (A) in the inkjet ink of the present invention is 30% by weight to 70% by weight, the photocurability is excellent, and the transmittance of the obtained cured film and the adhesion to the substrate are excellent. The balance of properties and strength is good, so it is preferably 40 wt% to 65 wt%, more preferably 45 wt% to 60 wt%, and particularly preferably 50 wt% to 60 wt%.

1.2. Monofunctional (meth) acrylate (B)

When the inkjet ink of the present invention contains a monofunctional (meth)acrylate (B), the viscosity of the inkjet ink of the present invention can be lowered, and the transmittance, strength, and adhesion to the substrate of the cured film can be improved. It also became good.

The monofunctional (meth) acrylate (B) is not particularly limited as long as it has only one (meth) acryl fluorenyl group as a functional group, but is preferably a monofunctional (meth) acrylate having an ester moiety as an alkyl group. (B), more preferably, the ester moiety is an alkyl group having 1 to 6 carbon atoms, particularly preferably an ester group having an alkyl group having 2 to 4 carbon atoms, particularly preferably an alkyl group having an ester moiety of 4 carbon atoms ( Methyl) acrylate (B).

Specific examples of the monofunctional (meth) acrylate (B) include cyclohexyl (meth) acrylate, n-hexyl (meth) acrylate, and dicyclopentenyl (meth) acrylate. ), dicyclopentenyloxy ethyl (meth)acrylate, dicyclopentanyl (meth)acrylate, isobornyl (meth)acrylate ( Isobornyl(meth)acrylate), 2-methyl-2-adamantyl(meth)acrylate, 2-ethyl-2-gold (meth)acrylate Alkyl ester (2-ethyl-2-adamantyl (meth)acrylate), 3,5-dimethyl-7-hydroxy adamantyl (meth) Acrylate), 3-hydroxy-1-(meth)acryloyloxy adamantane, 3-hydroxy-1-adamantyl (meth)acrylate ( 3-hydroxy-1-adamantyl (meth)acrylate), ethylcyclopentyl (meth)acrylate, 3,5-dihydroxy-1-(methyl)propene decyloxyadamantane (3,5-dihydroxy-1-(meth)acryloyloxy adamantane), tetrahydrofurfuryl (meth)acrylate, caprolactone modified tetrahydrofurfuryl (meth)acrylate , N-(meth)acryloyloxyethyl hexahydrophthalimide, cyclic trimethylolpropane (meth) acrylate, γ- Γ-butyrolactone (meth)acrylate, mevalonolactone (meth)acrylate, cyclic quinone imine (meth) acrylate , phenyl (meth) acrylate, benzyl (meth) acrylate, methylphenoxyethyl (meth) acrylate , 2-phenoxyethyl (meth)acrylate, ethylene oxide and/or propylene oxide addition monomer of 2-phenoxyethyl (meth)acrylate , 4-tert-butylcyclohexyl (meth)acrylate, cyclohexyl dimethanol mono(meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, (meth)acrylic acid Methyl ester, (methyl) Ethyl acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, isoamyl (meth)acrylate, isobutyl (meth)acrylate, n-butyl (meth)acrylate, ( Tert-butyl methacrylate, amyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethyl (meth) acrylate Hexyl hexyl ester, decyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, lauryl (meth) acrylate, (a Styrene stearyl acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1,4-cyclohexane dimethanol (methyl) Acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, (methyl) 3-methoxybutyl acrylate, 2-butoxyethyl (meth) acrylate, ethyl diethylene glycol (meth) acrylate, methyl dipropylene glycol (A) Methyl dipropylene glycol (meth)acrylate, dipropylene glycol mono(meth)acrylate, glycerol mono(meth)acrylate, triethyl (meth)acrylate (trifluoroethyl (meth)acrylate), glycidyl (meth)acrylate, 3,4-epoxycyclohexyl (meth)acrylate, Methyl glycidyl (meth)acrylate, 3-methyl-3-(meth)acryloyloxymethyl oxetane, 3- Ethyl-3-(methyl)propenyloxymethyloxetane, 3-methyl-3-(methyl)propenyloxyethyloxetane, 3-ethyl-3 -(Methyl)acryloxyethyl oxetane, 2-phenyl-3-(A Acryloxymethyloxetane, 2-trifluoromethyl-3-(methyl)propenyloxymethyloxetane, 4-trifluoromethyl-2-(methyl ) propylene methoxymethyl oxetane, (3-ethyl-3-oxetanyl) methyl (meth) acrylate , ω-carboxy polycaprolactone mono(meth)acrylate, succinic acid mono [2-(methyl) propylene methoxyethyl ester] (mono[2-( Meth)acryloyloxyethyl]succinate), maleic acid mono[2-(methyl)acryloxyethyl ester] (mono[2-(meth)acryloyloxyethyl]maleate) and 2-(meth)acryloyloxyethyl acid phosphate, and (meth)acrylic acid.

Among these monofunctional (meth) acrylates, cyclohexyl (meth) acrylate, n-hexyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, ( Tetrabutyl methacrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, ethyl (meth) acrylate, or methyl (meth) acrylate, coated by inkjet method The balance between the discharge property and the photocurability of the inkjet ink, the transmittance of the obtained cured film, and the adhesion to the substrate were improved. From these viewpoints, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, n-propyl (meth)acrylate, (methyl) are preferred. Isopropyl acrylate or ethyl (meth)acrylate, more preferably n-butyl (meth)acrylate or tert-butyl (meth)acrylate, most preferably n-butyl (meth)acrylate.

The monofunctional (meth) acrylate (B) may be one type or a mixture of two or more types.

If the content of the monofunctional (meth) acrylate (B) is 20% by weight to 60% by weight based on the total amount of the ink for inkjet of the present invention, it can be adjusted to conform to the viscosity of the use to be used, and therefore, it is preferable if The balance with other characteristics is more preferably from 25 wt% to 50 wt%, particularly preferably from 30 wt% to 45 wt%, particularly preferably from 30 wt% to 40 wt%.

1.3. Photopolymerization initiator (C)

The inkjet ink of the present invention contains a photopolymerization initiator (C). The photopolymerization initiator (C) can be produced by irradiation with ultraviolet rays or visible rays. The radical-generating compound is not particularly limited, but is preferably an α-hydroxyalkylphenone photopolymerization initiator or a mercaptophosphine oxide photopolymerization initiator, in particular, photocurability and yield. From the viewpoint of the transmittance of the cured film, a fluorenylphosphine oxide-based compound is more preferable.

Specific examples of the photopolymerization initiator (C) include benzophenone, Michler's ketone, 4,4'-bis(diethylamino)benzophenone, and mountains. Xanthone, thioxanthone, isopropyl ketone, 2,4-diethyl-sultanone, 2-ethyl anthraquinone, acetophenone, 2 2-hydroxy-2-methylpropiophenone, 2-hydroxy-2-methyl-4'-isopropylpropiophenone, 1-hydroxycyclohexyl phenyl ketone (1-hydroxy) Cyclohexyl phenylketone), isopropyl benzoin ether, isobutyl benzoin ether, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, Camphorquinone, benzantrone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinylpropan-1-one (2-methyl-1-) [4-(methylthio)phenyl]-2-morpholinopropan-1-one), 2-benzyl-2-dimethylamino-1-(4-morpholinylphenyl)-butanone-1 (2- Benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1), ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, 4,4'-di (Third butyl 4,4'-di(t-butyl peroxycarbonyl)benzophenone, 3,4,4'-tris(t-butylperoxycarbonyl)benzophenone, 3,3',4 , 4'-tetrakis(tert-butylperoxycarbonyl)benzophenone, 3,3',4,4'-tetrakis(trihexylperoxycarbonyl)benzophenone, 3,3'-di( Methoxycarbonyl)-4,4'-bis(t-butylperoxycarbonyl)benzophenone, 3,4'-bis(methoxycarbonyl)-4,3'-di(t-butyl Peroxycarbonyl)benzophenone, 4,4'-bis(methoxycarbonyl)-3,3'-di(t-butylperoxycarbonyl)benzophenone, 2-(4'-methoxy Benzyl)-4,6-bis(trichloromethyl)-s-triazine (2-(4'-methoxystyryl)-4,6-bis(trichloromethyl)-s-triazine), 2-(3' , 4'-dimethoxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 2-(2',4'-dimethoxystyryl)-4,6 - bis(trichloromethyl)-s-triazine, 2-(2'-methoxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 2-(4'-pentyl Oxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 4-[p-N,N-bis(ethoxycarbonylmethyl)]-2,6-di(three Chloromethyl)-s-triazine, 1,3-bis(trichloromethyl)-5-(2'-chlorophenyl)-s-triazine, 1,3-bis(trichloromethyl)-5- (4'-methoxy -s-triazine, 2-(p-dimethylamino styryl)benzoxazole, 2-(p-dimethylaminostyryl)benzene 2-(p-dimethylamino styrylbenzothiazole), 2-mercapto benzothiazole, 3,3'-carbonyl bis(7-diethylaminocoumarin) (3,3) '-carbonyl bis(7-diethylamino coumarin), 2-(o-chlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole (2-(o-chlorophenyl) -4,4',5,5'-tetraphenyl-1,2'-biimidazole), 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetra (4-B Oxycarbonylphenyl)-1,2'-biimidazole, 2,2'-bis(2,4-dichlorophenyl)-4,4',5,5'-tetraphenyl-1,2' -biimidazole, 2,2'-bis(2,4-dibromophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-bis ( 2,4,6-trichlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, 3-(2-methyl-2-dimethylaminopropyl 3-(2-methyl-2-dimethylamino propionyl)carbazole, 3,6-bis(2-methyl-2-morpholinylpropanyl)-9-n-dodecylfluorene Oxazole, 1-hydroxycyclohexyl phenyl ketone, bis(η ⁵ -2,4-cyclopentadien-1-yl)-bis(2,6-difluoro-3-(1H-pyrrol-1-yl) -phenyl)titanium (bis(η ⁵ -2,4-cyclopentadien-1-yl)-bis(2,6-difluoro-3-(1H-pyrrol-1-yl)-phenyl)titanium), bis(2,4,6-trimethylbenzene) Mercapto) phenylphosphine oxide and 2,4,6-trimethylbenzimidyldiphenylphosphine oxide.

Among them, 2-hydroxy-2-methylpropiophenone, 2-hydroxy-2-methyl-4'-isopropylpropiophenone, 1-hydroxycyclohexyl phenyl ketone, and bis (2, 4, 6) are preferred. -trimethylbenzhydryl)phenylphosphine oxide and 2,4,6-trimethylbenzimidyldiphenylphosphine oxide, preferably 2,4,6-trimethylbenzylidene Phenylphosphine oxide.

The photopolymerization initiator (C) may be one type or a mixture of two or more types.

When the content of the photopolymerization initiator (C) is from 1% by weight to 20% by weight based on the total amount of the inkjet ink of the present invention, it is excellent in photocurability to ultraviolet rays, and the obtained cured film has high transmittance, which is preferable. More preferably, it is 2 wt% - 15 wt%, and particularly preferably 3 wt% - 10 wt%.

1.4. Surfactant with photocrosslinkable functional group (D)

The inkjet ink of the present invention contains a surfactant (D) having a photocrosslinkable functional group. The component (D) improves the water repellency of the surface of the obtained cured film and has a photocrosslinkable functional group, thereby suppressing the unevenness of the diameter and height of the microlens formed by the inkjet method on the obtained cured film. When the (A) component, the (B) component, the (C) component, and the (D) component are formed into a crosslinked copolymer by ultraviolet (UV) irradiation, it is considered that a surfactant is formed on the surface of the cured film ( D) The structure of the hydrophobic portion. Therefore, think and The water contact angle of the cured film is improved by the presence of the surfactant (D) as compared with the cured product of the component (A), the component (B), and the component (C). Further, the surfactant (D) is crosslinked with the component (A), the component (B), the component (C) or the surfactant (D) by a photocrosslinkable functional group, and the surfactant (D) does not. Since it bleeds out from the cured film, it is considered that a stable contact angle is maintained even in the case where the droplet for forming the microlens is in contact with the coating film. It is considered that the above situation affects the unevenness of the diameter and height of the microlens.

The surfactant (D) having a photocrosslinkable functional group may, for example, be at least one selected from the group consisting of ethylene oxide, oxetane, acryl fluorenyl and methacryl fluorenyl groups. A ruthenium-based surfactant having a photocrosslinkable functional group and a fluorine-based surfactant. From the viewpoint of compatibility with the copolymer, a surfactant having an acrylonitrile group and/or a methacryl oxime group is more preferable.

A surfactant having a (meth)acrylinyl group as a photocrosslinkable functional group is commercially available as RS-72K manufactured by DIC Corporation.

The surfactant (D) having a photocrosslinkable functional group used in the inkjet ink of the present invention may be one type of compound or a mixture of two or more types of compounds.

When the content of the surfactant (D) having a photocrosslinkable functional group is 0.01% by weight to 10% by weight based on the total amount of the inkjet ink of the present invention, the water repellency of the surface of the cured film obtained from the inkjet ink High, so it is better. Further, when the amount is from 0.1% by weight to 5% by weight, the unevenness of the diameter and height of the microlens formed by the inkjet method on the obtained cured film is smaller, which is more preferable.

1.5. Polymerization inhibitor (E)

The inkjet ink of the present invention contains a polymerization inhibitor (E) in order to improve storage stability. Specific examples of the polymerization inhibitor include 4-methoxyphenol, hydroquinone, and phenothiazine. Among these polymerization inhibitors, phenothiazine is preferred because it has a small increase in viscosity even during long-term storage.

The polymerization inhibitor used in the inkjet ink of the present invention may be one type or a mixture of two or more types.

If the content of the polymerization inhibitor is 0.01% by weight to 1% by weight based on the total amount of the ink for inkjet of the present invention, the viscosity is increased even in long-term storage, so that it is preferable to consider the balance with other characteristics. More preferably, it is 0.01 wt% - 0.5 wt%, and particularly preferably 0.01 wt% - 0.1 wt%.

1.6. Solvent (F)

The inkjet ink of the present invention contains the solvent (F) in a range that does not impair the discharge property at the time of inkjet coating, the photocurability, the adhesion of the obtained cured film to the substrate, the transmittance, and the strength.

As a solvent which can be used in the present invention, a solvent having a boiling point of from 100 ° C to 300 ° C is preferred because of its excellent discharge property at the time of inkjet coating. In the case where the ink jet head is heated to a high temperature (for example, 70 ° C to 120 ° C), a solvent having a boiling point of 200 ° C to 300 ° C is preferable.

Specific examples of the solvent having a boiling point of 100 ° C to 300 ° C include butyl acetate, butyl propionate, ethyl lactate, methyl oxyacetate, ethyl oxyacetate, butyl oxyacetate, methoxyacetic acid. Methyl ester, ethyl methoxyacetate, butyl methoxyacetate, methyl ethoxyacetate, ethyl ethoxyacetate, methyl 3-oxypropionate, ethyl 3-oxypropionate, 3 -methyl methoxypropionate, 3-methoxy Ethyl propyl propionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, methyl 2-oxypropionate, ethyl 2-oxypropionate, 2-oxypropionic acid Propyl ester, methyl 2-methoxypropionate, ethyl 2-methoxypropionate, propyl 2-methoxypropionate, methyl 2-ethoxypropionate, 2-ethoxypropionic acid Ethyl ester, methyl 2-oxy-2-methylpropanoate, ethyl 2-oxy-2-methylpropionate, methyl 2-methoxy-2-methylpropanoate, 2-ethoxy Ethyl 2-methylpropionate, methyl pyruvate, ethyl pyruvate, propyl pyruvate, methyl acetate, ethyl acetate, methyl 2-oxobutanoate, 2-side Ethoxybutyrate, dioxane, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,4-butanediol, ethylene glycol monoisopropyl ether, ethylene Alcohol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, dipropylene glycol monoethyl ether acetate, dipropylene glycol monobutyl ether acetate, Ethylene glycol monobutyl ether acetate, cyclohexanone, cyclopentanone, diethylene glycol monomethyl ether, diethylene glycol Monomethyl ether acetate, diethylene glycol monoethyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol dimethyl ether , diethylene glycol diethyl ether, diethylene glycol methyl ether, toluene, xylene, anisole, γ-butyrolactone, N,N-dimethylacetamide (N, N-dimethyl Acetamide), N-methyl-2-pyrrolidone, and dimethyl imidazolidinone.

The solvent used for the inkjet ink of the present invention may be one type or a mixture of two or more types. From the viewpoint of easy application of the inkjet ink, it is preferred that the solvent (F) contains 50% by weight or more of a boiling point of 120 ° C to 300 ° C and a surface tension of 22 mN / m at 25 ° C with respect to the total amount thereof. 48 mN/m solvent.

When the content of the solvent is from 1% by weight to 60% by weight based on the total amount of the inkjet ink of the present invention, the discharge holes of the inkjet head are not dried and clogged during inkjet coating, which is preferable. More preferably, it is 1 wt% to 50 wt%, and particularly preferably 1 wt% to 40 wt%, in consideration of balance with other characteristics.

1.7. Epoxy resin (G)

The inkjet ink of the present invention contains an epoxy resin (G) as a thermosetting resin in order to increase the strength of the obtained cured film.

The epoxy resin is a compound having at least one structure derived from the epoxide represented by the formula (2-1) or the formula (2-2) in one molecule (hereinafter also simply referred to as "epoxy structure"). , there is no special limit.

Specific examples of the epoxy resin include a novolac type (phenol novolak type and cresol novolak type), a bisphenol A type, a bisphenol F type, a hydrogenated bisphenol A type, a hydrogenated bisphenol F type, and a bisphenol S type. a trisphenol methane type, a tetraphenol ethane type, a bixylenol type, a biphenol type, an alicyclic type, and a heterocyclic epoxy compound, and further having a dicyclopentadiene skeleton or a naphthalene skeleton The epoxy compound is preferably a phenolic type, a bisphenol A type or a bisphenol F type epoxy compound, and among them, a bisphenol A type and a bisphenol F type epoxy compound are particularly preferable.

The epoxy resin can be produced by a known method, and is also commercially available. Examples of commercially available products include N, N, N', N'-tetraglycidyl-m-xylylenediamine, and 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane. Alkane, N, N, N', N'-tetraglycidyl-4,4'-diaminodiphenylmethane; Techmore VG3101L (trade name, manufactured by Mitsui Chemicals Co., Ltd.), Epikote 828, Epikote 834, Epikote 1001, Epikote 1004 (trade name, manufactured by Mitsubishi Chemical Corporation), Epicron 840, Epicron 850, Epicron 1050, Epicron 2055 (trade name, manufactured by DIC), Epotohto YD-011, Epotohto YD-013, Epotohto YD-127, Epotohto YD-128 (trade name, manufactured by Tohto Kasei Co., Ltd.), DER317, DER331, DER661, DER664 (trade name, manufactured by Dow Chemical), Araldite 6071, Araldite 6084, Araldite GY250, Araldite GY260 (trade name, manufactured by Ciba Japan), Sumi-Epoxy ESA-011, Sumi-Epoxy ESA-014, Sumi-Epoxy ELA-115, Sumi-Epoxy ELA-128 (trade name, Sumitomo Chemical Industries) (manufacturing), AER330, AER331, AER661, AER664 (trade name, manufactured by Asahi Kasei Industrial Co., Ltd.) and other bisphenol A type epoxy compounds; 152, 154 (trade name, Mitsubishi (manufactured by the company), DER431, DER438 (trade name, manufactured by Dow Chemical), Epicron N-730, Epicron N-770, Epicron N-865 (trade name, manufactured by DIC), Epotohto YDCN-701, Epotohto YDCN-704 (trade name, manufactured by Tohto Kasei Co., Ltd.), Araldite ECN1235, Araldite ECN1273, Araldite ECN1299 (trade name, manufactured by Ciba Japan), XPY307, EPPN-201, EOCN-1025, EOCN-1020, EOCN-104S, RE-306 (trade name, manufactured by Nippon Kayaku Co., Ltd.), Sumi-Epoxy ESCN-195X, Sumi-Epoxy ESCN-220 (trade name, manufactured by Sumitomo Chemical Co., Ltd.), AERECN-235, AERECN-299 (product) Phenolic epoxy compound such as ADEKA (manufactured by ADEKA); Epicron 830 (trade name, manufactured by DIC), JER807 (trade name, manufactured by Mitsubishi Chemical Corporation), Epotohto YDF-170 (trade name, Dongdu) Bisphenol F-type epoxy compound such as Chemical (manufacturing), YDF-175, YDF-2001, YDF-2004, Araldite XPY306 (trade name, manufactured by Ciba Japan); Epotohto ST-2004, Epotohto ST-2007 Hydrogenated bisphenol A type epoxy compound such as Epotohto ST-3000 (trade name, manufactured by Tohto Kasei Co., Ltd.); Celloxide 2021 (trade name, manufactured by Daicel Chemical Industry Co., Ltd.), Araldite CY175, Araldite CY179 (trade name, An alicyclic epoxy compound such as Ciba Japan Co., Ltd.; YL-933 (trade name, manufactured by Mitsubishi Chemical Corporation), EPPN-501, EPPN-502 (trade name, manufactured by Dow Chemical Co., Ltd.), etc. Hydroxyphenylmethane type epoxy compound; YL-6056, YX-4000, YL-6121 (trade name, manufactured by Mitsubishi Chemical Corporation), etc. Epoxy compound or a mixture of these compounds; EBPS-200 (trade name, manufactured by Nippon Kayaku Co., Ltd.), EPX-30 (trade name, manufactured by ADEKA Co., Ltd.), EXA-1514 (trade name, DIC (share) ) bisphenol S type epoxy compound such as Manufacture; bisphenol A phenolic epoxy compound such as JER157S (trade name, manufactured by Mitsubishi Chemical Corporation); YL-931 (trade name, manufactured by Mitsubishi Chemical Corporation), Araldite 163 (trade name, manufactured by Ciba Japan Co., Ltd.) and other tetraphenylolethane type epoxy compounds; Araldite PT810 (business Product name, manufactured by Ciba Japan Co., Ltd., TEPIC (trade name, manufactured by Nissan Chemical Industries Co., Ltd.), and other heterocyclic epoxy compounds; HP-4032, EXA-4750, EXA-4700 (trade name, DIC) An epoxy compound having a dicyclopentadiene skeleton, such as a naphthalene epoxy compound; and HP-7200, HP-7200H, HP-7200HH (trade name, manufactured by DIC).

Among these epoxy resins, Techmore VG3101L (trade name, manufactured by Mitsui Chemicals Co., Ltd.) is preferred because it has high adhesion to various substrates.

The epoxy resin used in the inkjet ink of the present invention may be one type or a mixture of two or more types.

When the content of the epoxy resin is from 0.5% by weight to 20% by weight based on the total amount of the ink for inkjet, the adhesion of the obtained cured film to various substrates is improved, and therefore it is preferably from 0.5% by weight to 10% by weight. It is from 0.5 wt% to 7 wt%.

1.8. Thermosetting compound other than epoxy resin (G) (H)

The inkjet ink of the present invention may contain a thermosetting compound (H) other than the epoxy resin (G). In the present invention, the thermosetting compound is not particularly limited as long as it is a compound having a thermosetting functional group, and examples thereof include bismaleimide, a phenol resin, a melamine resin, and a ring. Oxygen hardener, etc.

The thermosetting compound to be used in the inkjet ink of the present invention may be one type or a mixture of two or more types.

When the content of the thermosetting compound is from 0.5% by weight to 20% by weight based on the total amount of the ink for inkjet, the heat resistance of the obtained cured film is improved, so it is preferably from 0.5% by weight to 10% by weight, particularly preferably 0.5% by weight. %~7wt%.

1.8.1. Bis-m-butylene diimine

The dim-butylene diimide is, for example, a compound represented by the following formula (6). The bis-methylenediimide represented by the following formula (6) is, for example, a compound obtained by reacting a diamine with an acid anhydride.

In the formula (6), R ¹⁰ and R ¹² are each independently hydrogen or a methyl group, and R ¹¹ is a divalent group represented by the following formula (7).

-R ¹³ -XR ¹⁴ - (7)

In the formula (7), R ¹³ and R ¹⁴ are each independently a discontinuous any methylene group, an alkylene group having 1 to 18 carbon atoms which may be substituted by oxygen, and a divalent group having an aromatic ring which may have a substituent. Or a cycloalkylene group which may have a substituent. Examples of the substituent in the aromatic ring and the cycloalkylene group include a carboxyl group, a hydroxyl group, an alkyl group having 1 to 5 carbon atoms, and an alkoxy group having 1 to 5 carbon atoms. In view of the high heat resistance of the obtained cured film, R ¹³ and R ¹⁴ are each independently a divalent group represented by any one of the following chemical formulas.

In the formula (7), X is a divalent group represented by any of the following chemical formulas.

The dim-butylene diimine may be one type or a mixture of two or more types.

1.8.2 Phenolic resin

The phenol resin is preferably a phenol resin obtained by a condensation reaction of an aromatic compound having a phenolic hydroxyl group with an aldehyde, a homopolymer of a vinyl phenol (including a hydride), a vinyl phenol, and a copolymerizable therewith. A vinyl phenol-based copolymer of a compound (including a hydride) or the like.

Examples of the aromatic compound having a phenolic hydroxyl group include phenol, o-cresol, m-cresol, p-cresol, o-ethylphenol, m-ethylphenol, p-ethylphenol, o-butylphenol, and m-butylphenol. , p-Butylphenol, o-xylenol, 2,3-xylenol, 2,4-xylenol, 2,5-xylenol, 3,4-xylenol, 3,5-xylenol , 2,3,5-trimethylphenol, 3,4,5-trimethylphenol, p-phenylphenol, resorcinol, hydroquinone, hydroquinone monomethyl ether, neighbor Pyrogallol, bisphenol A, bisphenol F, diphenol containing terpene backbone, gallic acid, gallic acid ester, α-naphthol, β-naphthalene Phenol and the like.

Examples of the aldehydes include formaldehyde (formaldehyde), paraformaldehyde, furfural, benzaldehyde, nitrobenzaldehyde, acetaldehyde, and the like.

Examples of the compound copolymerizable with the vinyl phenol include (meth)acrylic acid or a derivative thereof, styrene or a derivative thereof, maleic anhydride, vinyl acetate, acrylonitrile, and the like.

Specific examples of the phenol resin include Resitop PSM-6200 (trade name, manufactured by QunRong Chemical Co., Ltd.), Shonol BRG-555 (trade name, manufactured by Showa Polymer Co., Ltd.), Maruka Lyncur MS-2P, and Maruka Lyncur. CST70, Maruka Lyncur PHM-C (trade name, manufactured by Maruzen Petrochemical Co., Ltd.).

The phenol resin may be one type or a mixture of two or more types.

1.8.3. Melamine resin

The melamine resin is not particularly limited as long as it is a resin produced by polycondensation of melamine and formaldehyde, and examples thereof include methylol melamine. Etherified methylol melamine, benzoguanamine, methylol benzene melamine, etherified methylol melamine, and the like, and the like. Among these melamine resins, etherified methylol melamine is preferred in terms of good chemical resistance of the obtained cured film.

Specific examples of the melamine resin include Nikalac MW-30, MW-30HM, MW-390, MW-100LM, and MX-750LM (trade name, manufactured by Sanwa Chemical Co., Ltd.).

The melamine resin may be used alone or in combination of two or more.

1.8.4. Epoxy hardener

The inkjet ink of the present invention may contain an epoxy curing agent in order to further improve the chemical resistance of the obtained cured film. The epoxy curing agent is preferably an acid anhydride curing agent or a polyamine curing agent.

Examples of the acid anhydride-based curing agent include maleic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, hexahydrotrimellitic anhydride, and phthalic acid. An acid anhydride, trimellitic anhydride, a styrene-maleic anhydride copolymer or the like.

Examples of the polyamine-based curing agent include diethylene triamine, triethylene tetramine, tetraethylene pentamine, dicyandiamide, and polyfluorene. Amine (polyamide resin), ketimine compound, isophorone diamine, m-xylene diamine, m-phenylenediamine, 1,3-bis (amino group) Base) cyclohexane, N-aminoethyl piperazine, 4,4'-diaminodiphenylmethane, 4,4'-diamino-3,3'-diethyl Diphenylmethane, diamine Phenylhydrazine and the like.

The epoxy curing agent may be used alone or in combination of two or more.

1.9. Flame Retardant (I)

The inkjet ink of the present invention may contain a flame retardant (I). When a flame retardant is contained, since the cured film obtained is high in flame retardance, it is preferable. The flame retardant is not particularly limited as long as it is a compound capable of imparting flame retardancy, but an organic phosphorus-based flame retardant is preferably used from the viewpoint of low toxicity, low pollution, and safety.

Examples of the organophosphorus-based flame retardant include triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, and cresyl phenyl phosphate. 2-ethyl hexyl diphenyl phosphate, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (9,10-dihydro-9-oxa -10-phosphaphenanthrene-10-oxide), 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide, condensed 9,10-dihydro-9 - Oxo-10-phosphaphenanthrene-10-oxide.

In the flame retardant, even when the cured film obtained is exposed to a high temperature state, and no flame retardant is bleed out, it is preferred to use the following formula (F-1) as an organic phosphorus-based flame retardant. ) a compound of the structure indicated. The compound having a structure represented by the following formula (F-1) is more preferably used as HFA-3003 (trade name) as a condensed 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. A compound represented by the following formula (F-2), which is produced by Showa Polymer Co., Ltd.).

In the formula (F-2), m is an integer of 0 to 2, n is an integer of 1 to 3, and m+n is 3. Preferably, m is 1 or 2, n is 1 or 2, and m+n is 3.

The flame retardant may be one type or a mixture of two or more types. Further, the flame retardant described above can be produced by a known method, and is also commercially available as HFA-3003 manufactured by the above-mentioned Showa Polymer Co., Ltd.

When the content of the flame retardant is from 15% by weight to 30% by weight based on the total amount of the ink for inkjet, the flame retardancy of the obtained cured film is improved, and therefore it is preferably from 20% by weight to 25% by weight.

1.10. Other compounds having a radical polymerizable double bond

In addition to the trifunctional (meth) acrylate (A) and the monofunctional (meth) acrylate (B) represented by the formula (1), the inkjet ink of the present invention can be used without impairing inkjet printing. A compound having a radical polymerizable double bond is added to the range of the discharge property, the photocurability, and the adhesion of the obtained cured film to the substrate, the transmittance, and the strength.

Specific examples of the other compound having a radical polymerizable double bond include bis(hydroxymethyl)tricyclodecane di(meth)acrylate and tricyclodecane dimethylol di(meth)acrylate. Bisphenol F EO modified di(meth) acrylate, bisphenol A EO modified di(meth) acrylate, polypropylene glycol di(meth) acrylate, isomeric cyanuric acid EO modified di(methyl Acrylate, ethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, 1,4-butanediol di(methyl) Acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, (meth)acrylic acid dimer, crotonic acid, α-chloroacrylic acid, cinnamon Acid, maleic acid, fumaric acid, N-vinylformamide, polymethyl methacrylate macromonomer, N-cyclohexylmethyleneimine, N-phenyl cis-butane Equinoneimine, styrene, (meth) acrylamide, N,N-dimethyl(meth) acrylamide, N,N-diethyl(meth) acrylamide, N,N - dimethylaminopropyl (meth) acrylamide, N-isopropyl (meth) acrylamide, And N-hydroxyethyl (meth) acrylamide.

The other compound having a radical polymerizable double bond used in the inkjet ink of the present invention may be one type or a mixture of two or more types.

If other compounds having a radical polymerizable double bond are present in the hair From 0.1% by weight to 20% by weight based on the total amount of the ink for inkjet printing, the photocurability and the adhesion of the obtained cured film to the substrate, the transmittance, and the strength are good, and therefore it is preferably 0.1 wt%. 10% by weight, particularly preferably 0.1% by weight to 5% by weight.

1.11. Inkjet ink

1.11.1. Method for preparing ink for inkjet

The inkjet ink of the present invention can be prepared by mixing various components which are raw materials by a known method.

The inkjet ink of the present invention is particularly preferably prepared by mixing the above components (A) to (D) and optionally other components, and filtering and degasing the obtained solution. The inkjet ink of the present invention prepared in the above manner is excellent in discharge property at the time of inkjet coating. For the above filtration, a membrane filter made of, for example, a fluororesin is used.

1.11.2. Viscosity of inkjet ink

The inkjet ink of the present invention has a viscosity at 25 ° C measured by an E-type viscometer of 1 mPa ‧ to 200 mPa ‧ s, preferably 2 mPa ‧ to 150 mPa ‧ s, and more preferably 3 mPa ‧ to 100 mPa ‧ s . When the viscosity is the above, the inkjet ink of the present invention is applied by an inkjet method, and the discharge property of the inkjet device is improved.

Further, the viscosity of the ink for inkjet of the present invention at a temperature at which the ink jet device is ejected (preferably 10 ° C to 120 ° C) is preferably 1 mPa ‧ to 30 mPa ‧ , more preferably 2 mPa ‧ s to 25 mPa ‧ s, especially good for 3mPa‧s~20mPa‧s.

For inkjet inks having a viscosity of more than 30 mPa ‧ at 25 ° C In this case, by heating the ink jet head to lower the viscosity of the inkjet ink at the time of ejection, a more stable discharge can be performed. In the case where the film is ejected by heating, the viscosity of the ink for inkjet at a heating temperature (preferably 40 to 120 ° C) is preferably 1 mPa ‧ to 30 mPa ‧ , more preferably 2 mPa ‧ to 25 mPa ‧ Very good for 3mPa‧s~20mPa‧s.

In the case of heating the ink jet head, it is preferred to use a solvent-free inkjet ink.

1.11.3. Preservation of inkjet ink

When the ink for inkjet of the present invention is stored at -20 ° C to 25 ° C, the viscosity increase during storage is small, and the storage stability is good.

<2. Surface water-repellent hardening film>

The surface water repellent cured film of the present invention contains the crosslinked polymer of the above inkjet ink.

The method for producing a surface water repellent cured film of the present invention comprises the following steps.

(Step 1) a step of applying the inkjet ink onto the substrate by an inkjet method to form a coating film on the substrate; and (Step 2) a step of irradiating the coating film obtained in the step 1 with ultraviolet rays.

2.1. (Step 1) A step of applying the inkjet ink onto a substrate by an inkjet method to form a coating film on the substrate

The substrate to which the ink for inkjet of the present invention is applied is not particularly limited as long as it can be a target to which the ink for inkjet is applied, and the shape thereof is not limited to a flat plate shape, and may be a curved shape.

Further, the material of the substrate is not particularly limited, and examples thereof include polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), and polycondensation. Polyolefin resin such as ethylene and polypropylene, plastic film such as polyvinyl chloride, fluororesin, acrylic resin, polyamide, polycarbonate, and polyimide; cellophane, acetate, metal foil, poly a laminate film of a ruthenium and a metal foil, a glasse paper having a filling effect, a parchment paper, and a polyethylene, a clay binder, a polyvinyl alcohol, a starch or a carboxymethyl cellulose. Paper, glass, etc. which are filled by (carboxymethyl cellulose, CMC).

Among the substances constituting the substrates, additives such as an antioxidant, an anti-deterioration agent, a filler, an ultraviolet absorber, an antistatic agent, and/or an anti-electromagnetic wave agent may be further included in a range that does not adversely affect the effects of the present invention. In addition, at least a part of the surface of the substrate may be subjected to water-repellent treatment, corona treatment, plasma treatment, or blast treatment, etc., as needed, or an easy-adhesion layer or a color filter may be provided on at least a part of the surface. Protective film, rod coating film.

The thickness of the substrate is not particularly limited, and is usually 10 μm to 10 mm, which is appropriately adjusted depending on the purpose of use.

The inkjet ink of the present invention can be applied onto a substrate by a known inkjet coating method. Examples of the inkjet coating method include a piezoelectric method in which mechanical energy is applied to the ink to eject the ink from the inkjet head, and a coating method in which thermal energy is applied to the ink to eject the ink (so-called Bubble Jet (Registry) Mark))).

By using an inkjet coating method, the ink for inkjet can be applied in a predetermined pattern.

Examples of the ink jet head include an ink jet head having a liquid contact surface of a heat generating portion containing a metal and/or a metal oxide. Specific examples of the metal and/or metal oxide include metals such as Ta, Zr, Ti, Ni, and Al, and oxides of these metals.

For example, a coating apparatus which is preferably coated with the ink of the present invention is an apparatus which applies energy corresponding to a coating signal to ink in a chamber of an ink jet head having an ink containing portion for storing ink. Coating (drawing) corresponding to the above coating signal is performed while generating ink droplets by the above energy.

The inkjet coating device is not limited to a device in which the inkjet head is separated from the ink containing portion, and an apparatus in which the inkjet head is inseparably integrated with the ink containing portion may be used. In addition, the ink accommodating portion may be provided in a fixed portion of the device in addition to the ink accommodating portion that is detachably or inseparably integrated with the inkjet head, and may be attached to the inkjet head via an ink supply member such as a tube. An ink storage unit that supplies ink.

Further, as described above, the temperature of the ink jet head is preferably from 10 ° C to 120 ° C, and the viscosity of the ink for ink jet of the present invention at the heating temperature is preferably from 1 mPa ‧ to 30 mPa ‧ s.

2.2. (Step 2) Step of irradiating the coating film obtained in the step 1 with ultraviolet rays

The cured film of the present invention is obtained by the above-described method of the present invention by an inkjet method The coating film obtained by applying the inkjet ink to the surface of the substrate is irradiated with light such as ultraviolet rays or visible light to be cured. Specifically, it is obtained by crosslinking the polymer obtained by using the component (A) and the component (B).

The amount of light (exposure amount) to be irradiated when irradiated with ultraviolet rays or visible rays is dependent on the composition of the ink for inkjet, and is performed by an integrated light meter UIT-201 equipped with a light receiver UVD-365PD manufactured by Ushio Electric Co., Ltd. The measurement is preferably 100 mJ/cm ² to 5,000 mJ/cm ² , more preferably 200 mJ/cm ² to 4000 mJ/cm ² , and particularly preferably 300 mJ/cm ² to 3000 mJ/cm ² . Further, the wavelength of the ultraviolet ray or the visible ray to be irradiated is preferably from 200 nm to 500 nm, more preferably from 300 nm to 450 nm.

In addition, the exposure apparatus is not particularly limited as long as it is equipped with a high-pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a halogen lamp, or the like, and is irradiated with ultraviolet rays or visible rays in a range of 250 nm to 500 nm.

Further, the cured film which is cured by irradiation with light may be further heated, for example, at 80 ° C to 250 ° C for 10 minutes to 60 minutes, whereby the strength of the cured film can be further increased.

In the case where the surface water-repellent cured film of the present invention is a cured film obtained by irradiating the inkjet ink of the present invention with ultraviolet rays at an exposure amount of 2000 mJ/cm ² , using Drop Master 500 (manufactured by Kyowa Interface Chemical Co., Ltd.), The contact angle of water measured using pure water at 25 ° C is 90 or more, preferably 95 or more.

Since the contact angle of water of the surface water repellent cured film of the present invention is as described above, the water repellency is excellent, and as a result, it is considered that the state of the pattern is also caused when the microlens is formed on the surface water repellent cured film by the ink jet method. Shadow ring.

The surface water repellent cured film having the contact angle of water as described above is obtained by making the inkjet ink for forming a cured film into the composition of the present invention. The amount of the surfactant contained in the inkjet ink to satisfy the composition of the inkjet ink of the present invention is particularly affected.

<3. Substrate with microlens>

The microlens-attached substrate of the present invention includes a substrate, the surface water repellent cured film formed on the substrate, and a microlens formed on the surface water repellent cured film.

The microlens-attached substrate of the present invention is coated with a composition for forming a microlens by an inkjet method by using a surface water-repellent cured film formed on a substrate by the production method including the above steps 1 and 2. Obtained by forming a dot pattern.

As the composition for forming a microlens, a known composition used in a microlens can be used.

The inkjet method can be carried out in the same manner as the inkjet head and the coating device used in the application of the inkjet ink described above. The heating temperature of the inkjet head is selected such that the viscosity at the time of discharge of the composition for forming a microlens is 1 mPa‧s to 30 mPa‧s.

<4. Uses>

The use of the microlens-attached substrate is not particularly limited, and the surface water-repellent cured film obtained by the inkjet ink of the present invention is excellent in adhesion to the substrate and exhibits high transmittance and high strength. It is used as a substrate with microlenses used in optical parts, especially in backlight devices.

The spot diameter of the microlens used in the backlight device is not particularly limited, but is usually preferably 10 μm to 100 μm, more preferably 20 μm to 60 μm, and particularly preferably 30 μm to 50 μm. Further, the height of the dots is not particularly limited, but is usually preferably 0.5 μm to 10 μm, more preferably 1 μm to 8 μm, and particularly preferably 2 μm to 6 μm.

By mounting a backlight manufactured by using the microlens-attached substrate of the present invention as described above, for example, a liquid crystal display for a liquid crystal display element can be produced.

[Example]

Hereinafter, the present invention will be more specifically described based on examples, but the present invention is not limited to the examples.

The physical properties in the examples were measured under the following conditions.

(i) Viscosity: The viscosity at 25 ° C was measured using an E-type viscometer (manufactured by Toki Sangyo Co., Ltd., TV-22).

(ii) Water contact angle: It was measured using Pure Master 500 (manufactured by Kyowa Interface Chemical Co., Ltd.) at 25 ° C using pure water.

(iii) Unevenness of the diameter and height of the dot pattern of the microlens: a dot pattern of 10 × 10 (total 100) microlenses in the center of the substrate, using a stylus type film thickness meter P-15 (KLA- Tencor Japan (manufactured)) measures its diameter and height. The maximum value and the minimum value of the diameter and the height are obtained, and the difference between the two is used as an index of the unevenness of the diameter and height of the microlens.

(iv) Weight average molecular weight: Polystyrene having a molecular weight of 500 to 150,000 (PL2010-0102 (S-M2-10) standard manufactured by Polymer Laboratories) was used as the standard polystyrene, and the column was made using 2 Shodex PLgel MIXED -D (manufactured by Polymer Laboratories), Tetrahydrofuran (THF) was used as a mobile phase and was measured by gel permeation chromatography (GPC).

(v) Exposure amount: Measured by an integrated light meter UIT-201 equipped with a light receiver UVD-365PD manufactured by Ushio Electric Co., Ltd.

The trade names and manufacturers of the materials used in the examples are as follows.

EO modified (3 moles) glycerol triacrylate: "A-GLY-3E", manufactured by Shin-Nakamura Chemical Industry Co., Ltd.; Trimethylolpropane EO modified (3 moles) triacrylate: "M- 350", manufactured by East Asia Synthetic Co., Ltd.; Trimethylolpropane triacrylate: "M-309", manufactured by East Asia Synthetic Co., Ltd.; n-butyl methacrylate: manufactured by Tokyo Chemical Industry Co., Ltd.; methacrylic acid Ethyl ester: manufactured by Tokyo Chemical Industry Co., Ltd.; n-hexyl methacrylate: manufactured by Tokyo Chemical Industry Co., Ltd.; 2,4,6-trimethylbenzimidyldiphenylphosphine oxide: "DAROCUR TPO", Ciba Made in Japan; Surfactant containing propylene sulfhydryl group: "RS-72K", manufactured by DIC (Fluor); Fluorine surfactant: "F-553", manufactured by DIC (share); phenothiazine: Tokyo Chemical industry (stock) manufacturing; epoxy resin: "Techmore (trademark) VG3101L", manufactured by Mitsui Chemicals Co., Ltd.; phenolic resin: "Maruka Lyncur (trademark) PHM-C", Maruzen Oil Manufactured by Chemicals Co., Ltd.; Flame Retardant: "HFA-3003", manufactured by Showa Polymer Co., Ltd.

<Preparation of a composition for forming a microlens>

The materials shown below were mixed and dissolved, and then filtered through a 1 μm polytetrafluoroethylene (PTFE) membrane filter to prepare a composition for forming a microlens.

The viscosity of the ink is 12.3 mPa‧s.

[Example 1]

<Modulation of Inkjet Ink>

The materials shown in Table 1 were mixed and dissolved, and then filtered through a 1 μm PTFE membrane filter to prepare an inkjet ink 1. The viscosity of the inkjet ink 1 was 12.8 mPa‧s.

<Manufacture of surface water-repellent cured film>

Next, two 4 cm square glass substrates (thickness: 0.7 mm) which were subjected to ultraviolet irradiation by a low-pressure mercury lamp (PHOTO SURFACE PROCESSOR PL2003N-12, SEN special light source (manufactured by SEN)) to improve surface wettability were prepared. The inkjet ink 1 was injected into an inkjet cartridge, and the inkjet cartridge was mounted on an inkjet apparatus (DMP-2831, manufactured by FUJIFILM Dimatix Inc.), and a discharge nozzle (piezoelectric voltage) of 16 V was used using a 10 pl nozzle. Temperature 30 ° C, drive frequency 5 kHz, coating times 1 time Under the ejection conditions, the surface-treated surface of the glass substrate was sprayed point by point at intervals of 100 μm. The droplets spread wet on the glass substrate to form a solid film.

The solid film on the glass substrate was irradiated with ultraviolet light at a UV exposure amount of 2000 mJ/cm ² using a UV irradiation device (J-CURE 1500, manufactured by Jatec), thereby obtaining two blocks formed with a surface water repellent cured film. glass substrate. The water contact angle of the surface water repellent cured film was measured using one of the substrates, and it was 97°.

<Manufacture of Substrate with Microlens>

The composition for forming a microlens was injected into an ink jet cartridge, and the ink jet cartridge was mounted on an ink jet apparatus (DMP-2811, manufactured by FUJIFILM Dimatix Co., Ltd.), and a discharge nozzle (piezoelectric voltage) of 16 V was used using a 10 pl nozzle. Under the discharge condition of the nozzle temperature of 70 ° C, the drive frequency of 5 kHz, and the number of times of application, another substrate which was not used for measuring the water contact angle was used, and the surface water-repellent cured film formed on the glass substrate was spaced at 150 μm. Squirt point by point.

The glass substrate having a dot pattern at equal intervals was irradiated with ultraviolet light at a UV exposure amount of 2000 mJ/cm ² using a UV irradiation device (J-CURE 1500, manufactured by Jatec), whereby a microlens for evaluation was obtained. Substrate. The unevenness of the diameter and height of the microlens was evaluated.

The above results are shown in Table 1.

[Example 2 to Example 5]

An inkjet ink 2 to an inkjet ink 5 were prepared in the same manner as in Example 1 except that the materials shown in Table 1 were used. Measuring ink for inkjet 2~ The viscosity of the inkjet ink 5.

Using the inkjet ink 2 to the inkjet ink 5, two glass substrates on which the surface water repellent cured film was formed were obtained in the same manner as in Example 1. The water contact angle of the surface water repellent cured film was measured using one piece of the substrate.

A microlens-attached substrate was produced in the same manner as in Example 1 using another substrate which was not used for measuring the water contact angle, and the diameter and height unevenness of the microlens were evaluated.

The above results are shown in Table 1.

[Comparative Example 1]

The photocurable resin composition 5 was prepared in the same manner as in Example 1 except that the materials shown in Table 1 (the same composition as the composition for forming a microlens) were used. Using the photocurable resin composition 5, two glass substrates on which a cured film was formed were obtained in the same manner as in Example 1. The water contact angle of the above-mentioned cured film was measured using one piece of the substrate, and it was 54°.

Although a microlens was formed in the same manner as in Example 1 using another substrate which was not used for measuring the water contact angle, the composition for forming a microlens was wet-diffused on the cured film on the substrate, and microlenses could not be formed.

[Comparative Example 2]

The radical polymerizable monomer and the polymerization initiator were charged in a four-necked flask equipped with a stirrer at the following weight, and heated at a reflux temperature of 2-butanone for 4 hours to carry out polymerization.

The reaction solution was cooled to room temperature and poured into a large amount of hexane. The resulting precipitate was dried under reduced pressure at 1.3 ° × 10 ⁴ Pa at 60 ° C for 20 hr, and then pulverized by a mixer, and further dried under reduced pressure of 1.33 × 10 ⁴ Pa at 60 ° C for 10 hr under reduced pressure. 74.6 g of a white polymer were obtained. The polymer had a weight average molecular weight of 16,800.

A surface treatment agent was prepared by mixing and dissolving 10.0 g of the above polymer, 45.0 g of diethylene glycol methyl ether, and 45.0 g of γ-butyrolactone. The surface treatment agent had a viscosity at 25 ° C of 10.3 mPa ‧ s.

The surface treatment agent was injected into an inkjet cartridge, and the inkjet cartridge was mounted on an inkjet device (DMP-2811, manufactured by FUJIFILM Dimatix Co., Ltd.), and a discharge nozzle (piezoelectric voltage) of 16 V was used using a 10 pl nozzle. At a temperature of 25 ° C, a driving frequency of 5 kHz, and a number of times of application, the glass substrate (thickness: 0.7 mm) of 4 cm square was sprayed point by point at intervals of 150 μm. The droplets wet and spread on the glass substrate to form a solid film. The glass substrate was dried on a hot plate at 50 ° C for 5 minutes, and further dried on a hot plate at 150 ° C for 5 minutes to obtain two glass substrates on which a surface water-repellent film was formed. Using one of the obtained substrates, the water contact angle of the surface water-repellent film was measured and found to be 96°.

A microlens-attached substrate was produced in the same manner as in Example 1 using another substrate which was not used for measuring the water contact angle, and the diameter and height unevenness of the microlens were evaluated.

The above results are shown in Table 1.

[Comparative Example 3]

In the inkjet ink 1, an inkjet ink 6 was prepared in the same manner as in Example 1 except that a fluorine-based surfactant having no photocrosslinkable functional group was used instead of the acrylonitrile-containing surfactant. Viscosity.

Using the inkjet ink 6, two glass substrates on which the surface water repellent cured film was formed were obtained in the same manner as in Example 1. The water contact angle of the surface water repellent cured film was measured using one piece of the substrate.

A microlens-attached substrate was produced in the same manner as in Example 1 using another substrate which was not used for measuring the water contact angle, and the diameter and height unevenness of the microlens were evaluated.

The above results are shown in Table 1.

The symbols in the table are as follows.

A-GLY-3E: EO modified (3 moles) glycerol triacrylate

M-350: Trimethylolpropane EO modified (3 moles) triacrylate

M-309: Trimethylolpropane triacrylate

BMA: n-butyl methacrylate

EMA: ethyl methacrylate

HMA: n-hexyl methacrylate

TPO: 2,4,6-trimethylbenzimidyldiphenylphosphine oxide

RS-72K: Surfactant containing propylene sulfhydryl

F-553: Fluorine surfactant

EDM: Diethylene glycol methyl ether

GBL: γ-butyrolactone

VG: Epoxy

PHM: phenolic resin

HFA: Flame retardant.

As is clear from Table 1, if the ink for inkjet does not contain a surfactant, it is difficult to form a microlens on the cured film. Further, the microlens formed on the surface water repellent cured film obtained by the inkjet ink of the present invention, and the film formed from the previous surface treating agent and the interface containing no photocrosslinkable functional group The difference in diameter and height is small compared to the microlens on the film obtained by the inkjet ink of the active agent. Therefore, it can be preferably used for manufacturing A high-quality light guide for liquid crystal displays.

[Industrial availability]

As described above, when the microlens is formed by the inkjet method on the cured film obtained by the inkjet ink of the present invention, a microlens having a small diameter and height unevenness can be formed. Therefore, the composition can be used to manufacture high quality optical parts.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

Claims (28)

An inkjet ink comprising a trifunctional (meth) acrylate (A), a monofunctional (meth) acrylate (B), a photopolymerization initiator (C), and an interfacial activity having a photocrosslinkable functional group (D), and the inkjet ink is applied onto a substrate, and the contact angle of water measured at 25 ° C on the surface of the cured film obtained by irradiating ultraviolet rays at an exposure amount of 2000 mJ/cm ² is 90° or more. The viscosity at 25 ° C is 1 mPa ‧ to 200 mPa ‧ s. The inkjet ink according to Item 1, wherein the trifunctional (meth) acrylate (A) is a compound represented by the formula (1): (In the formula (1), R ¹ , R ² , R ³ and R ⁴ are each independently hydrogen or an alkyl group having 1 to 6 carbon atoms, and R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently carbon. The number is 1 to 6 alkylene groups, k is 0 or 1, and l, m and n are each independently an integer of 1 to 10). The inkjet ink according to Item 1 or 2, wherein the photocrosslinkable functional group of the surfactant (D) is selected from the group consisting of ethylene oxide, oxetane, and propylene. At least one of a group consisting of a thiol group and a methacryl fluorenyl group. The inkjet ink according to Item 3, wherein the photocrosslinkable functional group of the surfactant (D) is an acrylonitrile group and/or a methacryl oxime group. The inkjet ink according to any one of the items 1 to 2, wherein the surfactant (D) is a lanthanoid surfactant or a fluorine-based surfactant. The ink for inkjet according to any one of the items 1 to 2, wherein the trifunctional (methyl) is contained in an amount of 30% by weight to 70% by weight based on the total weight of the ink for inkjet. Acrylate (A), 20% by weight to 60% by weight of the monofunctional (meth) acrylate (B), 1% by weight to 20% by weight of the photopolymerization initiator (C), 0.01% by weight to 10% by weight The surfactant (D). The inkjet ink according to Item 2, wherein R ⁵ , R ⁶ and R ⁷ are each independently an alkylene group having 2 or 3 carbon atoms. The ink for inkjet according to Item 2, wherein R ¹ is hydrogen and k is 0. The ink for inkjet according to claim 2, wherein l, m and n are 1. The inkjet ink according to any one of the preceding claims, wherein the monofunctional (meth) acrylate (B) ester portion It is an alkyl group having a carbon number of 1 to 6. The ink for inkjet according to claim 10, wherein the monofunctional (meth) acrylate (B) is selected from the group consisting of cyclohexyl (meth) acrylate and n-hexyl (meth) acrylate, ( N-butyl methacrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, (meth)acrylic acid At least one of a group consisting of ethyl ester and methyl (meth) acrylate. The inkjet ink according to Item 11, wherein the monofunctional (meth) acrylate (B) is n-butyl (meth) acrylate. The inkjet ink according to any one of the preceding claims, wherein the photopolymerization initiator (C) is an α-hydroxyalkylphenone photopolymerization initiator or hydrazine. A phosphine oxide-based photopolymerization initiator. The inkjet ink according to Item 13, wherein the photopolymerization initiator (C) is 2,4,6-trimethylbenzimidyldiphenylphosphine oxide. The ink for inkjet according to any one of the items 1 to 2, further comprising a polymerization inhibitor (E). The inkjet ink according to Item 15, wherein the polymerization inhibitor (E) is phenothiazine. The inkjet ink according to any one of the items 1 to 2, further comprising a solvent (F). The inkjet ink according to Item 17, wherein the solvent (F) contains 50% by weight or more of a boiling point of 120 ° C to 300 ° C and 25 ° C with respect to the total weight of the solvent (F). Surface tension is 22 Solvent with mN/m~48mN/m. The inkjet ink according to any one of the items 1 to 2, further comprising an epoxy resin (G). The inkjet ink according to claim 19, further comprising a thermosetting compound (H) other than the epoxy resin (G). The inkjet ink according to any one of the items 1 to 2, wherein the flame retardant (I) is contained. The inkjet ink according to any one of the preceding claims, wherein the viscosity at 25 ° C is from 3 mPa ‧ to 100 mPa ‧ s. A surface water-repellent cured film comprising a crosslinked polymer of the inkjet ink according to any one of claims 1 to 22. A method for producing a surface water-repellent cured film, comprising the steps of: (Step 1) applying an inkjet ink according to any one of claims 1 to 22 to a substrate by an inkjet method A coating film is formed on the substrate; and (Step 2) the coating film obtained in the step 1 is irradiated with ultraviolet rays. A microlens-attached substrate comprising: a substrate, a surface water repellent cured film according to claim 23, and a microlens formed on the surface water repellent cured film. A method of manufacturing a microlens-attached substrate, comprising the steps of: (Step 1) applying an inkjet ink according to any one of claims 1 to 22 to a substrate by an inkjet method And as stated Forming a coating film on the substrate; (Step 2) irradiating the coating film obtained in the step 1 with ultraviolet rays to form a surface water repellent cured film; and (Step 3) on the surface water repellent film obtained in the step 2, A dot pattern is formed by coating a composition for forming a microlens by an inkjet method. An optical component comprising a microlens-attached substrate as described in claim 25. A liquid crystal display equipped with an optical component as described in claim 27 of the patent application.