WO2024204093A1 - 隔壁形成用インクジェット組成物、ledモジュール及びledモジュールの製造方法 - Google Patents
隔壁形成用インクジェット組成物、ledモジュール及びledモジュールの製造方法 Download PDFInfo
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- WO2024204093A1 WO2024204093A1 PCT/JP2024/011754 JP2024011754W WO2024204093A1 WO 2024204093 A1 WO2024204093 A1 WO 2024204093A1 JP 2024011754 W JP2024011754 W JP 2024011754W WO 2024204093 A1 WO2024204093 A1 WO 2024204093A1
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- inkjet composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
Definitions
- the present invention relates to an inkjet composition for forming a partition wall, which is applied using an inkjet device.
- the present invention also relates to an LED module using the inkjet composition for forming a partition wall.
- the present invention also relates to a method for manufacturing an LED module using the inkjet composition for forming a partition wall.
- LED devices equipped with light-emitting diode (LED) chips are widely used.
- methods of arranging a partition wall or a reflective layer around the periphery of the LED chip are being considered.
- Patent Document 1 discloses a method for manufacturing an LED device having a substrate, an LED element mounted on the substrate, a wavelength conversion layer covering the LED element, and a reflective layer formed on the substrate and outside the peripheral portion of the mounting area of the LED element.
- This manufacturing method includes the following steps: (1) a mounting step for mounting the LED element on the substrate. (2) a reflective layer forming step for applying a reflective layer forming composition containing light diffusing particles, an organosilicon compound, and a solvent onto the substrate, and drying and curing the reflective layer forming composition to form the reflective layer. (3) a wavelength conversion layer forming step for applying a wavelength conversion layer composition containing phosphor particles and a binder component so as to cover the LED element, and forming the wavelength conversion layer.
- a conventional method for forming partition walls is to use a dry film resist, develop it, and then plate it.
- this method requires multiple exposure and development steps, which results in poor productivity.
- Another possible method for forming a partition around the periphery of an LED chip is to use an inkjet device to apply an inkjet composition in a frame shape and then harden the applied inkjet composition to form the partition.
- partition walls formed from conventional inkjet compositions are repeatedly cooled and heated, the partition walls may peel off from the substrate or cracks may occur in the partition walls due to repeated expansion and contraction. In other words, it is difficult to improve the cooling and heating cycle properties with conventional inkjet compositions.
- This specification discloses the following inkjet composition for forming partition walls, LED module, and method for manufacturing an LED module.
- Item 1 An inkjet composition for forming partition walls, comprising a photocurable compound having a photocurable functional group and having or not having a thermosetting functional group, a thermosetting compound having no photocurable functional group and having a thermosetting functional group, a photopolymerization initiator, a thermosetting agent, and an antioxidant, the thermosetting compound being liquid at 25°C.
- Item 2 The inkjet composition for forming partition walls according to Item 1, wherein the antioxidant includes a phenol-based antioxidant.
- thermosetting compound includes a bisphenol A type epoxy compound or a bisphenol F type epoxy compound.
- Item 4 The inkjet composition for forming partition walls according to any one of items 1 to 3, wherein the photocurable compound has two or more (meth)acryloyl groups and includes a photocurable compound having an alicyclic skeleton.
- Item 5 The inkjet composition for forming partition walls according to any one of items 1 to 4, wherein the photocurable compound has two or more (meth)acryloyl groups and includes a photocurable compound having a dicyclopentadiene skeleton.
- Item 6 The inkjet composition for forming partition walls according to any one of items 1 to 5, wherein the content of the photocurable compound is 40% by weight or more and 75% by weight or less in 100% by weight of the inkjet composition for forming partition walls.
- Item 7 The inkjet composition for forming partition walls according to any one of items 1 to 6, wherein the content of the thermosetting compound is 10% by weight or more and 35% by weight or less in 100% by weight of the inkjet composition for forming partition walls.
- Item 8 The inkjet composition for forming partition walls according to any one of items 1 to 7, wherein the content of the antioxidant is 0.3% by weight or more and 4% by weight or less in 100% by weight of the inkjet composition for forming partition walls.
- Item 9 The inkjet composition for forming partition walls according to any one of items 1 to 8, wherein the photopolymerization initiator includes an aminoacetophenone-based photopolymerization initiator.
- Item 10 The inkjet composition for forming partition walls according to any one of items 1 to 9, wherein the heat curing agent includes an aromatic amine compound.
- Item 11 The inkjet composition for forming partition walls according to any one of items 1 to 10, wherein the heat curing agent includes 1,3-bis(3-aminophenoxy)benzene or bis[4-(3-aminophenoxy)phenyl]sulfone.
- An LED module comprising a substrate, an LED chip disposed on a first surface of the substrate, and a partition wall disposed on the first surface of the substrate, the partition wall being disposed on the first surface of the substrate so as to surround the LED chip, and the partition wall being a cured product of the inkjet composition for forming partition walls described in any one of items 1 to 11.
- Item 13 The LED module according to item 12, further comprising a reflective film on the inner wall surface of the partition.
- a method for manufacturing an LED module comprising the steps of: applying the inkjet composition for partition formation described in any one of Items 1 to 11 by an inkjet method onto the first surface of the substrate of an electronic component comprising a substrate and an LED chip disposed on a first surface of the substrate to form an inkjet composition layer; and curing the inkjet composition layer to form a partition on the first surface of the substrate, the method comprising the steps of: using an electronic component comprising a substrate and an LED chip disposed on a first surface of the substrate; and curing the inkjet composition layer to form a partition on the first surface of the substrate, the partition being disposed on the first surface of the substrate so as to surround the LED chip, the partition being a cured product of the inkjet composition for partition formation.
- Item 15 The method for manufacturing an LED module according to item 14, further comprising a step of disposing a reflective film on the inner wall surface of the partition.
- the inkjet composition for forming partition walls according to the present invention contains a photocurable compound having a photocurable functional group and having or not having a thermosetting functional group, a thermosetting compound having no photocurable functional group and having a thermosetting functional group, a photopolymerization initiator, a heat curing agent, and an antioxidant.
- the thermosetting compound is liquid at 25°C. Since the inkjet composition for forming partition walls according to the present invention has the above-mentioned configuration, it is possible to improve reflow resistance and improve heat-and-cool cycle characteristics.
- FIG. 1( a ) is a plan view that illustrates an LED module obtained by using the ink jet composition for partition wall formation according to the first embodiment of the present invention
- FIG. 1( b ) is a cross-sectional view that illustrates the LED module
- FIG. 2 is a cross-sectional view that illustrates an LED module obtained by using an ink jet composition for partition wall formation according to a second embodiment of the present invention.
- inkjet composition for forming partition walls The ink jet composition for forming partition walls according to the present invention (hereinafter, may be referred to as “ink jet composition”) is used for ink jet coating.
- the inkjet composition according to the present invention contains the following components:
- thermosetting compound having no photocurable functional group and having a thermosetting functional group (hereinafter, may be referred to as "(B) thermosetting compound")
- thermosetting compound having no photocurable functional group and having a thermosetting functional group (hereinafter, may be referred to as "(B) thermosetting compound")
- thermosetting compound (B) is liquid at 25°C.
- the inkjet composition has photocurable and thermosetting properties.
- the inkjet composition is a curable composition for inkjet and for forming partition walls.
- the inkjet composition is preferably cured by irradiation with light and heating before use. It is more preferable that the inkjet composition is cured by heating after curing is promoted by irradiation with light.
- the inkjet composition can be applied by an inkjet method.
- an inkjet device When applying the inkjet composition by an inkjet method, an inkjet device is used.
- the inkjet device has an inkjet head.
- the inkjet head has an inkjet nozzle.
- the inkjet composition is different from a composition applied by screen printing, a composition applied by a dispenser, and the like.
- the inkjet composition according to the present invention has the above-mentioned configuration, and therefore can improve reflow resistance.
- the inkjet composition according to the present invention can increase the mechanical strength of the resulting partition walls and can improve the adhesion between the substrate and the partition walls. More specifically, the inkjet composition according to the present invention can prevent the partition walls formed by the inkjet composition from cracking or peeling off from the substrate, even when heated by reflow.
- the inkjet composition according to the present invention has the above-mentioned configuration, it is possible to improve the cold-heat cycle characteristics.
- the inkjet composition according to the present invention even when cooling and heating are repeatedly performed, it is possible to maintain high mechanical strength of the partition walls obtained and high adhesion between the substrate and the partition walls. More specifically, even when cooling and heating are repeatedly performed for the partition walls formed by the inkjet composition, it is possible to prevent the partition walls from peeling off from the substrate and the partition walls from cracking.
- the inkjet composition according to the present invention has the above-mentioned configuration, when a reflective film is formed on the inner wall surface of the partition wall formed with the inkjet composition, the adhesion between the partition wall and the reflective film can be increased. More specifically, when a reflective film is formed on the inner wall surface of the partition wall formed with the inkjet composition, the inkjet composition according to the present invention can prevent the reflective film from peeling off from the partition wall even when heated by reflow.
- the inkjet composition is preferably used, for example, to form a partition in an LED module.
- the inkjet composition is preferably used to form a partition in the gap between multiple LED chips.
- the inkjet composition is preferably used to form a partition around the periphery of the mounting area of the LED chip. This can improve the efficiency of use of light generated from the LED chip.
- the LED chip is an LED chip that emits ultraviolet light (UV-LED chip)
- the light emission efficiency of the LED chip itself may be low. Since the light extraction efficiency can be improved by using the inkjet composition, the inkjet composition can be particularly preferably used when the LED chip is an LED chip that emits ultraviolet light (UV-LED chip).
- the inkjet composition is particularly suitable for use in LED modules using the COB method or the COG method. It is more preferable that the inkjet composition is used as an inkjet composition for forming partition walls in LED modules using the COB method or the COG method.
- the inkjet composition is in a liquid state at 25°C.
- a liquid state also includes a paste state.
- the viscosity ( ⁇ 25) of the inkjet composition at 25°C is preferably 20 mPa ⁇ s or more, more preferably 100 mPa ⁇ s or more, even more preferably 150 mPa ⁇ s or more, and is preferably 1500 mPa ⁇ s or less, more preferably 1000 mPa ⁇ s or less, even more preferably 800 mPa ⁇ s or less.
- the viscosity ( ⁇ 25) is equal to or more than the lower limit and equal to or less than the upper limit, the inkjet ejection properties can be further improved.
- the above viscosity ( ⁇ 25) is preferably measured using an E-type viscometer (e.g., "TVE22L” manufactured by Toki Sangyo Co., Ltd.) at 25°C and 10 rpm for the above inkjet composition immediately after preparation.
- E-type viscometer e.g., "TVE22L” manufactured by Toki Sangyo Co., Ltd.
- the inkjet device When ejected by the inkjet device, it is preferable to eject the inkjet composition in a state where it is heated to 40°C or more and 100°C or less. From the viewpoint of increasing the height precision of the obtained partition walls and making it difficult for voids to occur in the partition walls, it is preferable to apply the inkjet composition while circulating it.
- the inkjet device has an ink tank in which the inkjet composition is stored, a discharge part connected to the ink tank and from which the inkjet composition is discharged, and a circulation flow path part having one end connected to the discharge part and the other end connected to the ink tank and through which the inkjet composition flows.
- the inkjet composition that is not ejected from the ejection section is preferably applied while circulating the inkjet composition by flowing it through the circulation flow path section and moving it to the ink tank.
- the glass transition temperature (Tg) of the cured product of the inkjet composition is preferably 80°C or higher, more preferably 95°C or higher, and even more preferably 110°C or higher.
- the upper limit of the glass transition temperature (Tg) of the cured product of the inkjet composition is not particularly limited.
- the glass transition temperature (Tg) of the cured product of the inkjet composition may be 300°C or lower, or may be 250°C or lower.
- the range of the glass transition temperature (Tg) of the cured product of the inkjet composition can be set by appropriately selecting the lower limit and the upper limit.
- the glass transition temperature of the cured product of the inkjet composition can be measured using a dynamic viscoelasticity measuring device at a temperature rise rate of 10°C/min and a frequency of 10 Hz.
- a dynamic viscoelasticity measuring device examples include the "DVA-200" manufactured by IT Measurement and Control Co., Ltd.
- a cured product of the inkjet composition can be obtained, for example, by the following method. After applying the inkjet composition onto the surface of a glass substrate using an inkjet device, the composition is irradiated with ultraviolet light (UV-LED) with an integrated light quantity of 1000 mJ/ cm2 so that the illuminance at a wavelength of 365 nm is 1000 mW/ cm2 . The composition is then heated at 170°C for 3 hours for thermal curing, forming a cured product of the inkjet composition.
- UV-LED ultraviolet light
- (meth)acryloyl means one or both of “acryloyl” and “methacryloyl”
- (meth)acrylate means one or both of "acrylate” and “methacrylate”.
- the CH 2 ⁇ C (H or CH 3 ) group of the (meth)acryloyl group is not included in the vinyl group.
- the photocurable compound (A) is a compound having a photocurable functional group and having or not having a thermosetting functional group.
- the photocurable compound (A) may be a photo- and heat-curable compound.
- photocurable functional group examples include (meth)acryloyl groups and vinyl groups.
- the photocurable compound (A) may be a compound having a (meth)acryloyl group, a compound having a vinyl group, or the like.
- the photocurable compound (A) may be used alone or in combination of two or more kinds.
- the photocurable compound (A) has a (meth)acryloyl group. From the viewpoint of enhancing photocurability, it is preferable that the photocurable functional group of the photocurable compound (A) is a (meth)acryloyl group.
- the (A) photocurable compound may be a monofunctional (meth)acrylate or a polyfunctional (meth)acrylate.
- the (A) photocurable compound may be a bifunctional (meth)acrylate compound, a bifunctional or higher functional (meth)acrylate compound, a trifunctional (meth)acrylate compound, or a trifunctional or higher functional (meth)acrylate compound.
- the (A) photocurable compound may be a 20 or less functional (meth)acrylate compound, a 10 or less functional (meth)acrylate compound, or a 5 or less functional (meth)acrylate compound.
- the (A) photocurable compound may have one (meth)acryloyl group, may have two, may have two or more, may have three, may have three or more, may have four, may have four or more, may have 20 or less, may have 10 or less, or may have 5 or less.
- the photocurable compound (A) contains a photocurable compound having two or more (meth)acryloyl groups.
- the above monofunctional (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, i-propyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, sec-butyl (meth)acrylate, t-butyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, allyl (meth)acrylate, benzyl (meth)acrylate, cyclohexyl (meth)acrylate, phenyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 2-phenoxyethyl (meth)
- bifunctional (meth)acrylates examples include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanedi(meth)acrylate, 1,10-decanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 2,4-dimethyl-1,5-pentanediol di(meth)acrylate, butylethylpropanediol di(meth)acrylate, ethoxylated cyclohexanemethanol di(meth)acrylate, polyethylene glycol di(meth)acrylate, oligoethylene glycol di(meth)acrylate, ethylene glycol di(meth)acrylate, 2-ethyl-2-butylbutanediol di(meth)acrylate, 2-ethyl-2-butylpropanediol di(meth)acrylate
- trifunctional (meth)acrylates include trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, alkylene oxide-modified tri(meth)acrylate of trimethylolpropane, pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, trimethylolpropane tri((meth)acryloyloxypropyl)ether, alkylene oxide-modified tri(meth)acrylate of isocyanuric acid, dipentaerythritol propionate tri(meth)acrylate, tri((meth)acryloyloxyethyl)isocyanurate, and sorbitol tri(meth)acrylate.
- tetrafunctional (meth)acrylates examples include pentaerythritol tetra(meth)acrylate, sorbitol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, and dipentaerythritol propionate tetra(meth)acrylate.
- pentafunctional (meth)acrylates examples include sorbitol penta(meth)acrylate and dipentaerythritol penta(meth)acrylate.
- hexafunctional (meth)acrylates examples include dipentaerythritol hexa(meth)acrylate, sorbitol hexa(meth)acrylate, and alkylene oxide-modified hexa(meth)acrylate of phosphazene.
- the photocurable compound (A) contains a photocurable compound having an alicyclic skeleton.
- Examples of the alicyclic skeleton include a dicyclopentadiene skeleton, a cyclopropane skeleton, a cyclobutane skeleton, a cyclopentane skeleton, a cyclohexane skeleton, a cycloheptane skeleton, a cyclooctane skeleton, a cyclononane skeleton, a cyclodecane skeleton, a cycloundecane skeleton, a cyclododecane skeleton, a tetracyclododecene skeleton, a cubane skeleton, a basketane skeleton, a norbornene skeleton, an adamantane skeleton, and an isobornyl skeleton.
- the alicyclic skeleton is preferably a dicyclopentadiene skeleton.
- the (A) photocurable compound preferably includes a photocurable compound having two or more (meth)acryloyl groups and an alicyclic skeleton, and more preferably includes a photocurable compound having two or more (meth)acryloyl groups and a dicyclopentadiene skeleton.
- photocurable compounds having two or more (meth)acryloyl groups and an alicyclic skeleton include ethoxylated cyclohexanemethanol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, 1,3-adamantanediol di(meth)acrylate, propoxylated cyclohexanemethanol di(meth)acrylate, and pentaerythritol triacrylate-isophorone diisocyanate-urethane prepolymer.
- the photocurable compound (A) preferably contains 1,3-adamantanediol di(meth)acrylate or tricyclodecane dimethanol di(meth)acrylate, and more preferably contains tricyclodecane dimethanol di(meth)acrylate.
- the photocurable compound (A) contains a cyclopolymerizable compound.
- the cyclopolymerizable compound is a compound capable of cyclopolymerization.
- the cyclopolymerizable compound has a cyclopolymerizable group.
- the cyclopolymerizable compound is capable of forming a polymer having a cyclic skeleton. It is preferable that the cyclopolymerizable compound is capable of forming a polymer having a cyclic skeleton in the main chain.
- the cyclopolymerizable compound is preferably cyclized by radical polymerization.
- the cyclopolymerizable compound is preferably capable of forming a polymer having a cyclic skeleton by radical polymerization, and more preferably capable of forming a polymer having a cyclic skeleton in the main chain by radical polymerization.
- the radical polymerization reaction proceeds while cyclizing.
- the cyclic polymerizable compound is preferably capable of forming a 5-membered ring structure or a 6-membered ring structure, and more preferably capable of forming a 5-membered ring ether structure or a 6-membered ring ether structure.
- the cyclic polymerizable compound is preferably capable of forming a 5-membered ring structure, and more preferably capable of forming a 5-membered ring ether structure.
- the cyclopolymerizable compound has a photocurable functional group.
- the cyclopolymerizable compound is a compound having a photocurable functional group and a cyclopolymerizable group.
- the cyclopolymerizable compound is a cyclopolymerizable photocurable compound.
- the photocurable functional group may be a part of the cyclopolymerizable group or may be a side chain of the cyclopolymerizable group.
- the photocurable functional group and the cyclopolymerizable group may share some atoms or some skeletons.
- the cyclopolymerizable compound may have one cyclopolymerizable group, two cyclopolymerizable groups, two or more cyclopolymerizable groups, three or more cyclopolymerizable groups, four or more cyclopolymerizable groups, five or more cyclopolymerizable groups, or six or more cyclopolymerizable groups.
- the cyclopolymerizable compound may have 12 or less cyclopolymerizable groups, eight or less cyclopolymerizable groups, or six or less cyclopolymerizable groups.
- the cyclopolymerizable compound includes a photocurable compound having one cyclopolymerizable group.
- the cyclopolymerizable compound includes a photocurable compound having two or more cyclopolymerizable groups.
- the cyclopolymerizable compound may have one or more photocurable functional groups.
- the photocurable functional group in the cyclopolymerizable compound may be a group that is not cyclopolymerized, and the photocurable functional group in the cyclopolymerizable compound may be a group that is not included in a ring structure after cyclization (a group that does not form a ring structure after cyclization).
- the cyclopolymerizable compound may have one photocurable functional group, two photocurable functional groups, two or more photocurable functional groups, three or more photocurable functional groups, four or more photocurable functional groups, or five or more photocurable functional groups.
- the cyclopolymerizable compound may have 10 or less photocurable functional groups. From the viewpoint of more effectively exerting the effects of the present invention, it is preferable that the cyclopolymerizable compound includes a photocurable compound having one photocurable functional group. From the viewpoints of further enhancing the photocurability of the inkjet composition, favorably forming partition walls having a larger aspect ratio, increasing the glass transition temperature (Tg) of the cured product of the inkjet composition, and further enhancing the thermal cycle properties of the cured product of the inkjet composition, it is preferable that the cyclopolymerizable compound includes a photocurable compound having two or more photocurable functional groups.
- Examples of the cyclopolymerizable group, the group containing the cyclopolymerizable group, or the photocurable functional group include a (meth)acryloyl group, an ⁇ -(allyloxymethyl)acryloyl group, and a vinyl group.
- the cyclopolymerizable group or the group containing the cyclopolymerizable group of the cyclopolymerizable compound is preferably a (meth)acryloyl group or an ⁇ -(allyloxymethyl)acryloyl group.
- the photocurable functional group of the cyclopolymerizable compound is preferably a (meth)acryloyl group or an ⁇ -(allyloxymethyl)acryloyl group.
- the cyclopolymerizable compound preferably has a (meth)acryloyl group or an ⁇ -(allyloxymethyl)acryloyl group.
- the cyclopolymerizable compound may have one (meth)acryloyl group or ⁇ -(allyloxymethyl)acryloyl group, may have two (meth)acryloyl groups or ⁇ -(allyloxymethyl)acryloyl groups, or may have two or more (meth)acryloyl groups or ⁇ -(allyloxymethyl)acryloyl groups.
- the cyclopolymerizable compound may have three or more (meth)acryloyl groups or ⁇ -(allyloxymethyl)acryloyl groups, may have four or more (meth)acryloyl groups or ⁇ -(allyloxymethyl)acryloyl groups, or may have five or more (meth)acryloyl groups or ⁇ -(allyloxymethyl)acryloyl groups.
- the cyclopolymerizable compound may have 10 or less (meth)acryloyl groups or ⁇ -(allyloxymethyl)acryloyl groups.
- the cyclopolymerizable compound may be a monofunctional (meth)acrylate or a monofunctional ⁇ -(allyloxymethyl)acrylic acid, or may be a polyfunctional (meth)acrylate or a polyfunctional ⁇ -(allyloxymethyl)acrylic acid. From the viewpoint of further increasing the cyclopolymerizability, further increasing the photocurability, and favorably forming a partition wall having a larger aspect ratio, it is preferable that the cyclopolymerizable compound contains a polyfunctional (meth)acrylate or a polyfunctional ⁇ -(allyloxymethyl)acrylic acid.
- the cyclopolymerizable compound may contain a bifunctional (meth)acrylate compound or a bifunctional ⁇ -(allyloxymethyl)acrylic acid, or may contain a trifunctional (meth)acrylate compound or a trifunctional ⁇ -(allyloxymethyl)acrylic acid.
- the cyclopolymerizable compound may contain a tetrafunctional (meth)acrylate compound or a tetrafunctional ⁇ -(allyloxymethyl)acrylic acid, or may contain a pentafunctional (meth)acrylate compound or a pentafunctional ⁇ -(allyloxymethyl)acrylic acid.
- the cyclopolymerizable compound may contain a hexafunctional (meth)acrylate compound or a hexafunctional ⁇ -(allyloxymethyl)acrylic acid, or may contain a heptafunctional or higher (meth)acrylate compound or a heptafunctional or higher ⁇ -(allyloxymethyl)acrylic acid.
- the cyclopolymerizable compound may contain a decafunctional or lower (meth)acrylate compound or a decafunctional or lower ⁇ -(allyloxymethyl)acrylic acid.
- Examples of the monofunctional (meth)acrylates or monofunctional ⁇ -(allyloxymethyl)acrylic acids include methyl-2-(allyloxymethyl)acrylic acid, 2-methoxyethyl-2-(allyloxymethyl)acrylic acid, tetrahydrofuran-2-ylmethyl-2-(allyloxymethyl)acrylic acid, 2-phenoxyethyl-2-(allyloxymethyl)acrylic acid, cyclohexyl-2-(allyloxymethyl)acrylic acid, and isobornyl-2-(allyloxymethyl)acrylic acid.
- bifunctional (meth)acrylates or bifunctional ⁇ -(allyloxymethyl)acrylic acids examples include tripropylene glycol di-2-(allyloxymethyl)acrylic acid, 1,6-hexanediol di-2-(allyloxymethyl)acrylic acid, neopentyl glycol di-2-(allyloxymethyl)acrylic acid, and tricyclodecane dimethanol di-2-(allyloxymethyl)acrylic acid.
- Examples of the above trifunctional (meth)acrylates or trifunctional ⁇ -(allyloxymethyl)acrylic acids include trimethylolpropane tri-2-(allyloxymethyl)acrylic acid.
- hexafunctional (meth)acrylate or hexafunctional ⁇ -(allyloxymethyl)acrylic acid includes dipentaerythritol hexa-2-(allyloxymethyl)acrylic acid, etc.
- the cyclopolymerizable compound has two or more carbon-carbon double bonds.
- the cyclopolymerizable compound may have 12 or less carbon-carbon double bonds, 8 or less, or 6 or less carbon-carbon double bonds.
- the cyclopolymerizable compound has an allyl ether group. From the viewpoint of exerting the effects of the present invention more effectively, it is preferable that the cyclopolymerizable group in the cyclopolymerizable compound is an allyl ether group.
- the cyclopolymerizable group or the group containing the cyclopolymerizable group is preferably a vinyl group, a (meth)acryloyl group, or an ⁇ -(allyloxymethyl)acryloyl group, more preferably a (meth)acryloyl group or an ⁇ -(allyloxymethyl)acryloyl group.
- the photocurable functional group is preferably a vinyl group, a (meth)acryloyl group, or an ⁇ -(allyloxymethyl)acryloyl group, more preferably a (meth)acryloyl group or an ⁇ -(allyloxymethyl)acryloyl group.
- the cyclopolymerizable compound preferably has a vinyl group, a (meth)acryloyl group, or an ⁇ -(allyloxymethyl)acryloyl group, more preferably a (meth)acryloyl group or an ⁇ -(allyloxymethyl)acryloyl group.
- a vinyl group a (meth)acryloyl group, or an ⁇ -(allyloxymethyl)acryloyl group, more preferably a (meth)acryloyl group or an ⁇ -(allyloxymethyl)acryloyl group.
- the cyclopolymerizable compound has a structure represented by the following formula (1).
- R represents an organic group having 1 to 200 carbon atoms.
- the cyclopolymerizable compound When the cyclopolymerizable compound has a structure represented by formula (1), the cyclopolymerizable compound can form a polymer having a five-membered ring ether structure in the main chain by radical polymerization.
- the number of carbon atoms in R is 1 or more and 200 or less, preferably 150 or less, and more preferably 100 or less.
- R is preferably an alkyl group.
- R may be a linear alkyl group, a branched alkyl group, or a cyclic alkyl group.
- R may contain an ether bond.
- R can be, for example, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an isobutyl group, a phenyl group, a pentyl group, a vinyl group, an allyl group, a crotyl group, a cyclopropyl group, a cyclobutyl group, a cyclohexyl group, a tetrahydrofurfuryl group, a methoxymethyl group, a methoxyethyl group, an ethoxymethyl group, an ethoxyethyl group, a phenoxyethyl group, a vinyloxyethyl group, an epoxy group, an isobornyl group, an adamantyl group, a dicyclopentadienyl group,
- R is preferably a methyl group or an ethyl group, and more preferably a methyl group.
- the cyclopolymerizable compound may have an alicyclic skeleton.
- the cyclopolymerizable compound may have an alicyclic skeleton.
- the cyclopolymerizable compound may have a cyclopolymerizable group and an alicyclic skeleton.
- Examples of the cyclopolymerizable compounds having the above alicyclic skeleton include cyclohexyl-2-(allyloxymethyl)acrylic acid, isobornyl-2-(allyloxymethyl)acrylic acid, and tricyclodecane dimethanol di-2-(allyloxymethyl)acrylic acid.
- the cyclopolymerizable compound contains methyl-2-(allyloxymethyl)acrylate (i.e., methyl 2-(allyloxymethyl)acrylate).
- the photo- and thermosetting compounds have a photo-curable functional group and a thermosetting functional group.
- the thermosetting functional group include a cyclic ether group, a maleimide group, and a cyclic thioether group.
- the cyclic ether group include an epoxy group and an oxetanyl group.
- the epoxy group may be an epoxy group in a glycidyl group.
- the cyclic thioether group include a thietane group and a thiirane group.
- the above-mentioned photo- and thermosetting compounds include glycidyl (meth)acrylate, allyl glycidyl ether, 4-hydroxybutyl (meth)acrylate glycidyl ether, and 3,4-epoxycyclohexylmethyl (meth)acrylate.
- the glass transition temperature (Tg) of the homopolymer of the photocurable compound (A) is preferably 100°C or higher, more preferably 130°C or higher, and even more preferably 160°C or higher. If the glass transition temperature (Tg) of the homopolymer of the photocurable compound (A) is equal to or higher than the lower limit, the thermal cycle properties can be further improved.
- the upper limit of the glass transition temperature (Tg) of the homopolymer of the photocurable compound (A) is not particularly limited.
- the glass transition temperature (Tg) of the homopolymer of the photocurable compound (A) may be 250°C or lower, or may be 220°C or lower.
- the range of the glass transition temperature (Tg) of the homopolymer of the photocurable compound (A) can be set by appropriately selecting the lower limit and the upper limit.
- the glass transition temperature of the homopolymer of the photocurable compound (A) refers to the glass transition temperature of a homopolymer having a degree of polymerization of 3000 to 4000 (preferably 3500).
- the glass transition temperature can be measured in accordance with JIS K7121 using a differential scanning calorimeter at a heating rate of 10°C/min.
- Examples of the differential scanning calorimeter include the "DSC7020" manufactured by Hitachi High-Tech Science Corporation.
- the content of the photocurable compound (A) in 100% by weight of the inkjet composition is preferably 30% by weight or more, more preferably 40% by weight or more, even more preferably 60% by weight or more, and is preferably 75% by weight or less, more preferably 70% by weight or less, even more preferably 65% by weight or less.
- a partition wall having an even larger aspect ratio can be formed.
- thermosetting compound (B) does not have a photocurable functional group, but has a thermocurable functional group.
- the thermosetting functional group may be a cyclic ether group, a maleimide group, or a cyclic thioether group.
- the cyclic ether group may be an epoxy group or an oxetanyl group.
- the epoxy group may be an epoxy group in a glycidyl group.
- the cyclic thioether group may be a thietane group or a thiirane group.
- thermosetting compound includes a compound having a cyclic ether group, a compound having a maleimide group, and a compound having a thiirane group.
- the above (B) thermosetting compound may be used alone or in combination of two or more types.
- thermosetting compound is liquid at 25°C.
- thermosetting compound is solid at 25°C, it may be difficult to dissolve the (E) antioxidant in the inkjet composition, and the effects of the present invention may not be achieved.
- the (B) thermosetting compound is liquid at 25°C, the (E) antioxidant described below can be sufficiently dissolved in the inkjet composition.
- the thermal cycle characteristics can be improved, and when a reflective film is formed on the inner wall surface of the partition formed by the inkjet composition, the adhesion between the partition and the reflective film can be improved.
- the (B) thermosetting compound is liquid at 25°C, the solubility of the (B) thermosetting compound in the inkjet composition is excellent, and therefore storage stability can be further improved.
- the viscosity of the (B) thermosetting compound at 25°C is preferably 100 mPa ⁇ s or more, more preferably 500 mPa ⁇ s or more, even more preferably 1000 mPa ⁇ s or more, and is preferably 70000 mPa ⁇ s or less, more preferably 30000 mPa ⁇ s or less, even more preferably 15000 mPa ⁇ s or less.
- the viscosity of the (B) thermosetting compound at 25°C is equal to or more than the above lower limit and equal to or less than the above upper limit, the inkjet ejection property is further improved, and the effects of the present invention can be exerted more effectively.
- thermosetting compound (B) at 25°C is preferably measured using an E-type viscometer (e.g., "TVE22L” manufactured by Toki Sangyo Co., Ltd.) under conditions of 25°C and 10 rpm.
- E-type viscometer e.g., "TVE22L” manufactured by Toki Sangyo Co., Ltd.
- thermosetting compound preferably has a cyclic ether group or a thiirane group, more preferably has a cyclic ether group or a cyclic thioether group, even more preferably has a cyclic ether group, and particularly preferably has an epoxy group.
- thermosetting compound preferably contains an epoxy compound.
- the above epoxy compounds include bisphenol A type epoxy compounds, bisphenol F type epoxy compounds, bisphenol S type epoxy compounds, phenol novolac type epoxy compounds, cresol novolac type epoxy compounds, biphenyl type epoxy compounds, biphenyl novolac type epoxy compounds, biphenol type epoxy compounds, naphthalene type epoxy compounds, fluorene type epoxy compounds, phenol aralkyl type epoxy compounds, naphthol aralkyl type epoxy compounds, dicyclopentadiene type epoxy compounds, anthracene type epoxy compounds, epoxy compounds having an adamantane skeleton, epoxy compounds having a tricyclodecane skeleton, naphthylene ether type epoxy compounds, and epoxy compounds having a triazine nucleus in the skeleton.
- thermosetting compound preferably contains an epoxy compound having an aromatic skeleton, and more preferably contains a bisphenol A type epoxy compound or a bisphenol F type epoxy compound.
- thermosetting compound contains a bisphenol A type epoxy compound or a bisphenol F type epoxy compound, it is possible to further improve the reflow resistance and the thermal cycle characteristics.
- the content of the thermosetting compound (B) in 100% by weight of the inkjet composition is preferably 7% by weight or more, more preferably 10% by weight or more, even more preferably 15% by weight or more, and is preferably 40% by weight or less, more preferably 35% by weight or less, and even more preferably 30% by weight or less.
- the content of the thermosetting compound (B) is equal to or more than the lower limit and equal to or less than the upper limit, the effects of the present invention are more effectively exerted, the storage stability of the inkjet composition is improved, and a partition wall having a larger aspect ratio can be formed.
- the total content of the (A) photocurable compound and the (B) thermosetting compound is preferably 70% by weight or more, more preferably 80% by weight or more, even more preferably 85% by weight or more, and is preferably 98% by weight or less, more preferably 95% by weight or less, and even more preferably 92% by weight or less.
- the total content of the (A) photocurable compound and the (B) thermosetting compound is equal to or more than the above lower limit and equal to or less than the above upper limit, the effects of the present invention are more effectively exhibited, the storage stability of the inkjet composition is improved, and a partition wall having a larger aspect ratio can be formed.
- the ink jet composition includes a photopolymerization initiator (C).
- the photopolymerization initiator (C) may be a photoradical polymerization initiator, a photocationic polymerization initiator, or the like.
- the photopolymerization initiator (C) may be used alone or in combination of two or more kinds.
- the photoradical polymerization initiator is a compound that generates radicals by irradiation with light and initiates a radical polymerization reaction.
- the photoradical polymerization initiator include benzoin-based photopolymerization initiators such as benzoin, benzoin methyl ether, benzoin ethyl ether, and benzoin isopropyl ether; alkylphenone-based photopolymerization initiators such as 2-hydroxy-2-methyl-1-phenyl-propan-1-one; acetophenone-based photopolymerization initiators such as acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, and 1,1-dichloroacetophenone; 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butane-1-one,
- aminoacetophenone-based photopolymerization initiators such as 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1, 2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl)phenyl]-1-butanone, N,N-dimethylaminoacetophenone, 2-(dimethylamino)-2-(4-methylbenzyl)-1-(4-morpholinophenyl)butan-1-one, and 2-methyl-[4-(methylthio)phenyl]-2-morpholino-1-propane; hydroxyacetophenones such as 1-hydroxycyclohexyl phenyl ketone; 2-methylanthraquinone, 2-ethylanthraquinone, 2 anthraquinone-based photopolymerization initiators such as 2,4-dimethylthioxanthone, 2,4-dieth
- a photopolymerization initiator assistant may be used together with the above-mentioned photoradical polymerization initiator.
- the photopolymerization initiator assistant include N,N-dimethylaminobenzoic acid ethyl ester, N,N-dimethylaminobenzoic acid isoamyl ester, pentyl-4-dimethylaminobenzoate, triethylamine, and triethanolamine.
- Other photopolymerization initiator assistants may also be used. Only one type of the above-mentioned photopolymerization initiator assistant may be used, or two or more types may be used in combination.
- the above cationic photopolymerization initiators include sulfonium salts, iodonium salts, metallocene compounds, and benzoin tosylate.
- the above cationic photopolymerization initiators may be used alone or in combination of two or more.
- the (C) photopolymerization initiator preferably contains a photoradical polymerization initiator, more preferably contains an ⁇ -hydroxyacetophenone-based photopolymerization initiator, and even more preferably contains an aminoacetophenone-based photopolymerization initiator.
- the (C) photopolymerization initiator particularly preferably contains 2-(dimethylamino)-2-(4-methylbenzyl)-1-(4-morpholinophenyl)butan-1-one.
- the content of the photopolymerization initiator (C) in 100% by weight of the inkjet composition is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, even more preferably 1% by weight or more, and is preferably 30% by weight or less, more preferably 20% by weight or less, even more preferably 10% by weight or less.
- a partition wall having an even larger aspect ratio can be formed.
- the content of the (C) photopolymerization initiator relative to 100 parts by weight of the (A) photocurable compound is preferably 1 part by weight or more, more preferably 3 parts by weight or more, even more preferably 5 parts by weight or more, and is preferably 30 parts by weight or less, more preferably 20 parts by weight or less, even more preferably 15 parts by weight or less.
- a partition wall having an even larger aspect ratio can be formed.
- the ink jet composition further comprises a thermosetting agent (D).
- the thermosetting agent (D) thermally cures the thermosetting compound.
- the above-mentioned (D) heat curing agent includes organic acids, amine compounds, amide compounds, hydrazide compounds, imidazole compounds, imidazoline compounds, phenol compounds, urea compounds, polysulfide compounds, and acid anhydrides.
- the above-mentioned (D) heat curing agent may be used alone or in combination of two or more kinds.
- the above amine compounds include aliphatic polyamines, alicyclic polyamines, aromatic polyamines, hydrazides, and guanidine derivatives.
- the above amine compounds may be modified polyamine compounds such as amine-epoxy adducts.
- the above amine compounds may be adducts of the above amine compounds.
- Examples of the adducts of the above amine compounds include epoxy compound-added polyamines (reactants of epoxy compounds and polyamines), Michael addition polyamines (reactants of ⁇ , ⁇ -unsaturated ketones and polyamines), Mannich addition polyamines (condensates of polyamines with formalin and phenols), thiourea-added polyamines (reactants of thiourea and polyamines), and ketone-blocked polyamines (reactants of ketone compounds and polyamines (ketimines)).
- the above-mentioned aliphatic polyamines include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and diethylaminopropylamine.
- the above alicyclic polyamines include menthene diamine, isophorone diamine, N-aminoethylpiperazine, 3,9-bis(3-aminopropyl)-2,4,8,10-tetraoxaspiro(5,5)undecane adduct, bis(4-amino-3-methylcyclohexyl)methane, and bis(4-aminocyclohexyl)methane.
- the aromatic polyamines include m-phenylenediamine, p-phenylenediamine, o-xylylenediamine, m-xylylenediamine, p-xylylenediamine, 4,4-diaminodiphenylmethane, 4,4'-diamino-3,3'-diethyl-5,5'-dimethyldiphenylmethane, 4,4-diaminodiphenylpropane, 4,4-diaminodiphenylsulfone, 4,4-diaminodicyclohexane, bis(4-aminophenyl)phenylmethane, 1,5-diaminonaphthalene, 1,1-bis(4-aminophenyl)cyclohexane, 2,2-bis[(4-aminophenoxy)phenyl]propane, bis[4-(3-aminophenoxy)phenyl]sulfone, 1,3
- hydrazides examples include carbodihydrazide, adipic acid dihydrazide, sebacic acid dihydrazide, dodecanedioic acid dihydrazide, and isophthalic acid dihydrazide.
- guanidine derivatives include dicyandiamide, 1-o-tolyldiguanide, ⁇ -2,5-dimethylguanide, ⁇ , ⁇ -diphenyldiguanide, ⁇ , ⁇ -bisguanylguanidinodiphenyl ether, p-chlorophenyldiguanide, ⁇ , ⁇ -hexamethylenebis[ ⁇ -(p-chlorophenol)]diguanide, phenyldiguanide oxalate, acetylguanidine, and diethylcyanoacetylguanidine.
- the above-mentioned phenolic compounds include polyhydric phenolic compounds.
- Examples of the above-mentioned polyhydric phenolic compounds include phenol, cresol, ethylphenol, butylphenol, octylphenol, bisphenol A, tetrabromobisphenol A, bisphenol F, bisphenol S, 4,4'-biphenylphenol, phenol novolac resins containing a naphthalene skeleton, phenol novolac resins containing a xylylene skeleton, phenol novolac resins containing a dicyclopentadiene skeleton, and phenol novolac resins containing a fluorene skeleton.
- acid anhydrides examples include phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylnadic anhydride, dodecylsuccinic anhydride, chlorendic anhydride, pyromellitic anhydride, benzophenonetetracarboxylic anhydride, methylcyclohexenetetracarboxylic anhydride, trimellitic anhydride, and polyazelaic anhydride.
- the (D) heat curing agent preferably contains an amine compound, more preferably contains an aromatic amine compound, even more preferably contains an aromatic polyamine, and particularly preferably contains 1,3-bis(3-aminophenoxy)benzene or bis[4-(3-aminophenoxy)phenyl]sulfone.
- an amine compound more preferably contains an aromatic amine compound, even more preferably contains an aromatic polyamine, and particularly preferably contains 1,3-bis(3-aminophenoxy)benzene or bis[4-(3-aminophenoxy)phenyl]sulfone.
- the content of the (D) heat curing agent in 100% by weight of the inkjet composition is preferably 1% by weight or more, more preferably 5% by weight or more, even more preferably 7% by weight or more, and is preferably 40% by weight or less, more preferably 30% by weight or less, and even more preferably 20% by weight or less.
- the content of the (D) heat curing agent is equal to or more than the lower limit and equal to or less than the upper limit, a partition wall having a larger aspect ratio is formed, and high adhesion between the substrate and the partition wall can be maintained even when cooling and heating are repeatedly performed.
- the content of the (D) heat curing agent is preferably 10 parts by weight or more, more preferably 20 parts by weight or more, and even more preferably 30 parts by weight or more, and is preferably 110 parts by weight or less, more preferably 90 parts by weight or less, and even more preferably 70 parts by weight or less, relative to 100 parts by weight of the (B) heat curing compound.
- the content of the (D) heat curing agent is equal to or more than the above lower limit and equal to or less than the above upper limit, a partition wall having a larger aspect ratio is formed, and high adhesion between the substrate and the partition wall can be maintained even when cooling and heating are repeatedly performed.
- the inkjet composition includes an antioxidant (E). Since the inkjet composition includes the antioxidant (E), it can improve the cold-heat cycle characteristics. The reason why the cold-heat cycle characteristics can be improved is considered to be that radicals generated at high temperatures, which cause resin deterioration, are trapped by the antioxidant (E), thereby suppressing resin deterioration. In addition, since the inkjet composition includes the antioxidant (E), it can improve the adhesion between the partition wall and the reflective film when a reflective film is formed on the inner wall surface of the partition wall formed by the inkjet composition.
- the (E) antioxidants include phenol-based antioxidants, thioether-based antioxidants, and phosphorus-based antioxidants.
- the phenol-based antioxidants are antioxidants having a phenol skeleton.
- the thioether-based antioxidants are antioxidants having a thioether skeleton.
- the phosphorus-based antioxidants are antioxidants containing phosphorus atoms.
- the (E) antioxidants may be used alone or in combination of two or more.
- phenolic antioxidants include 2,6-di-t-butyl-p-cresol (BHT), butyl hydroxyanisole (BHA), 2,6-di-t-butyl-4-ethylphenol, stearyl- ⁇ -(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 2,2'-methylene bis-(4-methyl-6-butylphenol), 2,2'-methylene bis-(4-ethyl-6-t-butylphenol), 4,4'-butylidene-bis-(3-methyl-6-t-butylphenol), 1,1,3-tris-(2-methyl-hydroxy-5- t-butylphenyl)butane, tetrakis[methylene-3-(3',5'-butyl-4-hydroxyphenyl)propionate]methane, 1,3,3-tris-(2-methyl-4-hydroxy-5-t-butylphenol)butane, 1,3,5-trimethyl-2,4,
- the above thioether antioxidants include distearyl thiodipropionate, pentaerythritol-tetrakis (dodecyl thiopropionate), pentaerythritol-tetrakis (3-lauryl thiopropionate), pentaerythritol-tetrakis (stearyl thiopropionate), pentaerythritol-tetrakis (lauryl thiobutyrate), pentaerythritol-tetrakis (myristyl thiopropionate), and pentaerythritol-tetrakis (lauryl thioacetate).
- the above phosphorus-based antioxidants include tridecyl phosphite, tris(tridecyl)phosphite, triphenyl phosphite, trinonylphenyl phosphite, bis(tridecyl)pentaerythritol diphosphite, bis(decyl)pentaerythritol diphosphite, tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-di-t-butyl-6-methylphenyl)ethyl ester phosphorous acid, and 2,2'-methylenebis(4,6-di-t-butyl-1-phenyloxy)(2-ethylhexyloxy)phosphorus.
- the (E) antioxidant preferably contains a phenol-based antioxidant, and is more preferably a phenol-based antioxidant.
- the (E) antioxidant preferably does not contain a thioether-based antioxidant, preferably does not contain a phosphorus-based antioxidant, and preferably does not contain an antioxidant other than a phenol-based antioxidant.
- the phenol-based antioxidant may be a hindered phenol-based antioxidant.
- the content of the (E) antioxidant in the inkjet composition (100% by weight) is preferably 0.1% by weight or more, more preferably 0.3% by weight or more, even more preferably 0.5% by weight or more, and is preferably 5% by weight or less, more preferably 4% by weight or less, even more preferably 3% by weight or less.
- the content of the (E) antioxidant is equal to or more than the lower limit and equal to or less than the upper limit, the effects of the present invention can be more effectively exhibited.
- the content of the phenolic antioxidant in the inkjet composition (100% by weight) is preferably 0.1% by weight or more, more preferably 0.3% by weight or more, even more preferably 0.5% by weight or more, and is preferably 5% by weight or less, more preferably 4% by weight or less, and even more preferably 3% by weight or less.
- the content of the phenolic antioxidant is equal to or more than the lower limit and equal to or less than the upper limit, the effect of the present invention is more effectively exhibited, the inkjet ejection properties of the inkjet composition are further improved, and the storage stability can be increased.
- the content of the (E) antioxidant relative to 100 parts by weight of the (B) thermosetting compound is preferably 1 part by weight or more, more preferably 1.5 parts by weight or more, even more preferably 3 parts by weight or more, even more preferably 5 parts by weight or more, and is preferably 35 parts by weight or less, more preferably 30 parts by weight or less, and particularly preferably 15 parts by weight or less.
- the content of the (E) antioxidant is equal to or more than the above lower limit and equal to or less than the above upper limit, the effects of the present invention can be exhibited even more effectively.
- the content of the phenolic antioxidant relative to 100 parts by weight of the thermosetting compound (B) is preferably 1 part by weight or more, more preferably 1.5 parts by weight or more, even more preferably 3 parts by weight or more, particularly preferably 5 parts by weight or more, and is preferably 35 parts by weight or less, more preferably 20 parts by weight or less, and even more preferably 15 parts by weight or less.
- the content of the phenolic antioxidant is equal to or more than the lower limit and equal to or less than the upper limit, the effects of the present invention can be exhibited even more effectively.
- the inkjet composition may contain other components in addition to the above-mentioned components, such as a coupling agent, a dispersant, a filler, a leveling agent, a defoaming agent, a curing accelerator, a solvent, and a polymerization inhibitor.
- the inkjet composition may contain colorants such as pigments and dyes as other components, but preferably does not contain colorants. When the inkjet composition does not contain colorants, the photoreactivity can be further improved, and the effects of the present invention can be more effectively achieved.
- Colorants such as pigments and dyes are not particularly limited, but examples thereof include black colorants such as carbon black.
- the LED module according to the present invention includes a substrate, an LED chip disposed on a first surface of the substrate, and a partition wall disposed on the first surface of the substrate.
- the partition wall is disposed on the first surface of the substrate so as to surround the LED chip.
- the partition wall is a cured product of the above-mentioned partition wall-forming ink jet composition.
- the LED module according to the present invention has the above-mentioned configuration, which improves reflow resistance and thermal cycle characteristics.
- the LED module according to the present invention preferably further comprises a reflective film on the inner wall surface of the partition.
- an electronic component that includes a substrate and an LED chip disposed on a first surface of the substrate.
- the method for manufacturing an LED module according to the present invention includes the following steps: Applying the above-mentioned inkjet composition for partition formation on the first surface of the substrate in the electronic component by an inkjet method to form an inkjet composition layer; Curing the inkjet composition layer to form a partition on the first surface of the substrate.
- the partition in the obtained LED module, the partition is disposed on the first surface of the substrate so as to surround the LED chip, and the partition is a cured product of the inkjet composition for partition formation.
- the manufacturing method of the LED module according to the present invention has the above-mentioned configuration, which improves reflow resistance and improves thermal cycle characteristics.
- the manufacturing method of the LED module according to the present invention preferably includes a step of arranging the LED chip on the first surface of the substrate to obtain an electronic component.
- the manufacturing method of the LED module according to the present invention preferably includes a step of placing a reflective film on the inner wall surface of the partition.
- FIG. 1(a) is a plan view showing a schematic diagram of an LED module obtained using an inkjet composition for partition wall formation according to the first embodiment of the present invention.
- FIG. 1(b) is a cross-sectional view showing a schematic diagram of the LED module.
- FIG. 1(b) is a cross-sectional view taken along line I-I in FIG. 1(a).
- the LED module 1 shown in FIG. 1 includes a substrate 11, an LED chip 12 disposed on a first surface 11a of the substrate 11, and a partition wall 13 disposed on the first surface 11a of the substrate 11.
- the partition wall 13 is disposed on the first surface 11a of the substrate 11 so as to surround the LED chip 12.
- the partition wall 13 is a cured product of the inkjet composition for partition wall formation described above.
- the partition wall 13 is formed by the inkjet composition for partition wall formation described above.
- the partition wall 13 is not disposed (formed) on the surface of the LED chip 12.
- the upper surface of the LED chip 12 is not covered by the partition wall 13.
- the partition wall 13 has a frame-like shape.
- FIG. 2 is a cross-sectional view showing a schematic diagram of an LED module obtained using an inkjet composition for partition wall formation according to a second embodiment of the present invention.
- the LED module 1A shown in FIG. 2 further includes a reflective film 14 on the inner wall surface (inner surface) of the partition 13. There is a gap between the outer surface of the LED chip 12 and the inner surface of the partition 13. There is a space between the outer surface of the LED chip 12 and the inner surface of the partition 13. There is a gap between the outer surface of the LED chip 12 and the inner surface of the reflective film 14. There is a space between the outer surface of the LED chip 12 and the inner surface of the reflective film 14.
- the LED module 1A differs from the LED module 1 only in the reflective film 14.
- the LED module may or may not further include a reflective film on the inner wall surface of the partition.
- the partition wall is arranged in a frame shape. In the LED module, it is preferable that the partition wall is not arranged in the center of the substrate. From the viewpoint of increasing the brightness of the LED module, it is preferable that the outer surface of the LED chip and the inner surface of the partition wall are spaced apart. From the viewpoint of increasing the brightness of the LED module, it is preferable that a space exists between the outer surface of the LED chip and the inner surface of the partition wall.
- the width and height of the partition wall can be changed as appropriate.
- the width of the partition wall may be 30 ⁇ m or more, 50 ⁇ m or more, 70 ⁇ m or more, 1000 ⁇ m or less, 800 ⁇ m or less, or 700 ⁇ m or less.
- the height of the LED chip is preferably 10 ⁇ m or more, more preferably 20 ⁇ m or more, even more preferably 50 ⁇ m or more, and is preferably 300 ⁇ m or less, more preferably 200 ⁇ m or less, even more preferably 150 ⁇ m or less.
- the height of the partition is preferably 100 ⁇ m or more, more preferably 300 ⁇ m or more, even more preferably 600 ⁇ m or more, and is preferably 3000 ⁇ m or less, more preferably 2000 ⁇ m or less, even more preferably 1500 ⁇ m or less.
- the height of the partition is preferably at least 50 ⁇ m higher than the height of the LED chip, more preferably at least 100 ⁇ m higher, and even more preferably at least 200 ⁇ m higher.
- the aspect ratio of the partition (the ratio of height to width (height/width)) is preferably 5 or more, more preferably 8 or more, and even more preferably 10 or more.
- the aspect ratio of the partition (the ratio of height to width (height/width)) may be 100 or less, 50 or less, 25 or less, or 15 or less.
- the substrate may or may not be a transparent material.
- Examples of the substrate include a circuit board and a silicon substrate.
- the LED chip may be a red LED chip, a blue LED chip, a green LED chip, a UV-LED chip, or a combination of these LED chips.
- the UV-LED chip may be a deep ultraviolet UV-LED chip.
- the LED module may or may not further include a reflective film on the inner wall surface of the partition. From the viewpoint of further increasing the extraction efficiency of light generated from the LED chip, it is preferable that the LED module further includes a reflective film on the inner wall surface of the partition.
- the manufacturing method of the LED module preferably includes a step of arranging a reflective film on the inner wall surface of the partition.
- the reflective film may or may not be formed on the outer wall surface of the partition.
- the material of the reflective film may be silver, chromium, copper, titanium, aluminum, etc. Only one type of material may be used for the reflective film, or two or more types may be used in combination. From the viewpoint of further increasing the efficiency of use of the light generated from the LED chip, it is preferable that the material of the reflective film is titanium or aluminum.
- Methods for forming the reflective film on the inner wall surface of the partition wall include electroless plating, electroplating, physical collision, mechanochemical reaction, physical film formation, physical adsorption, and coating the surface of the partition wall with a metal powder or a paste containing a metal powder and a binder.
- the method for forming the reflective film on the surface of the partition wall is preferably electroless plating, electroplating, or physical collision.
- Examples of the physical film formation method include vacuum deposition, ion plating, and ion sputtering.
- a sheeter composer manufactured by Tokuju Kosakusho Co., Ltd. is used.
- the shape of the LED module is not particularly limited.
- the shape of the LED module may be round, rectangular, or triangular.
- Bifunctional (meth)acrylate compound 1 Tricyclodecane dimethanol diacrylate ("IRR214K” manufactured by Daicel Allnex Corporation, a (meth)acrylate compound having a dicyclopentadiene skeleton, glass transition temperature of homopolymer: 190° C.)
- Bifunctional (meth)acrylate compound 3 Dipropylene glycol diacrylate (DPGDA manufactured by Daicel Allnex Corporation, glass transition temperature of homopolymer: 110° C.)
- Bifunctional (meth)acrylate compound 4 ethoxylated bis
- Epoxy compound 1 Bisphenol A type epoxy compound (DIC Corporation "CRP850”, viscosity at 25°C 4500 mPa ⁇ s (liquid at 25°C))
- Epoxy compound 2 Bisphenol F type epoxy compound (DIC Corporation "CRP830”, viscosity at 25°C 1300 mPa ⁇ s (liquid at 25°C))
- Epoxy compound 3 dicyclopentadiene dimethanol diglycidyl ether ("EP4088S” manufactured by ADEKA Corporation, viscosity at 25°C: 230 mPa ⁇ s (liquid at 25°C))
- Epoxy compound 4 Bisphenol A type epoxy compound ("YD127” manufactured by Nippon Steel Chemical & Material Co., Ltd., viscosity at 25°C 9500 mPa ⁇ s (liquid at 25°C))
- Epoxy compound 5 dicyclopentadiene type epoxy compound ("HP7200L” manufactured by DIC Corporation, solid at 25°C)
- Curing accelerator DBU-octylate ("UCAT SA102" manufactured by San-Apro Co., Ltd.)
- TBT-Cu Copper(II) dibutyldithiocarbamate
- Examples 1 to 15 and Comparative Examples 1 to 4 Preparation of Inkjet Composition: The components shown in Tables 1 to 5 were blended in the blending amounts (% by weight) shown in Tables 1 to 5 and mixed uniformly to obtain ink jet compositions for forming partition walls (ink jet compositions).
- Formation of the bulkhead An aluminum nitride substrate with a surface roughness Ra of 0.4 ⁇ m was prepared. On the surface of the substrate, the ink jet composition obtained was circulated at 75° C. while being applied, and a first light irradiation step (UV-LED lamp with a main wavelength of 365 nm, 4000 mW/cm 2 , irradiation for 0.1 seconds 0.2 seconds after application) were repeated to form a B-staged product with a width of 600 ⁇ m, length of 5 mm, and height of 1000 ⁇ m. Then, curing was advanced in a second light irradiation step (metal halide lamp, 1000 mW/cm 2 , irradiation for 10 seconds). Then, the product was heated at 200° C. for 1 hour for thermal curing, to obtain a laminate in which partition walls were formed on the surface of the substrate.
- a first light irradiation step UV-LED lamp with a main wavelength of 365 nm,
- Storage stability (1-1) Storage The obtained ink jet composition was stored at ⁇ 20° C. and 5° C. for 48 hours, respectively, and then filtered using a 0.2 ⁇ m membrane filter to observe whether or not there was any precipitate. The storage stability (storage) was evaluated according to the following criteria.
- the ratio ( ⁇ 2/ ⁇ 1) is 1.0 or more and less than 1.1.
- the ratio ( ⁇ 2/ ⁇ 1) is 1.1 or more and less than 1.2.
- the ratio ( ⁇ 2/ ⁇ 1) is 1.2 or more.
- the inkjet composition obtained was applied onto a substrate using an inkjet head of a piezoelectric inkjet printer equipped with an ultraviolet irradiation device.
- the applied inkjet composition was then irradiated with ultraviolet light to form a B-staged material layer.
- the above application process and the above photocuring process were repeated in the thickness direction of the formed B-staged material layer.
- the obtained B-staged material layer was then heated and thermally cured to form partition walls.
- partition walls were observed using a laser microscope (Olympus Corporation, "OLS4100") to confirm whether or not it was possible to form 1) partition walls with a width of 300 ⁇ m and a height of 1000 ⁇ m, 2) partition walls with a width of 200 ⁇ m and a height of 1000 ⁇ m, and 3) partition walls with a width of 100 ⁇ m and a height of 1000 ⁇ m.
- OLS4100 laser microscope
- Reflow resistance (3-1) Mechanical strength of partition wall (initial stage)
- the obtained laminate was subjected to a reflow treatment for 3 minutes (30 seconds at a peak top temperature of 320°C).
- the laminate after the reflow treatment was observed using a microscope ("VHX-5000" manufactured by Keyence Corporation) to see whether the partition walls had peeled off from the substrate and whether cracks had occurred in the partition walls.
- the die shear strength of the laminate before and after the reflow treatment was measured by pressing the partition walls at a height of 500 ⁇ m from the substrate surface using a die shear strength measuring device ("DAGE 4000PXY” manufactured by Nordson Corporation) under conditions of a blade length of 2 mm and a speed of 10 ⁇ m/s.
- DAGE 4000PXY manufactured by Nordson Corporation
- the die shear strength before the reflow treatment was set to F1
- the die shear strength after the reflow treatment was set to F2, and the ratio (F2/F1) was calculated.
- the mechanical strength (initial) of the partition walls was judged according to the following criteria.
- ⁇ : F3 is 40N or more.
- ⁇ : F3 is 30N or more but less than 40N.
- ⁇ : F3 is less than 30N.
- ⁇ : F4 is 3 kg or more.
- ⁇ : F4 is 2 kg or more but less than 3 kg.
- ⁇ : F4 is less than 2 kg.
- the ratio (F5/F3) is 0.90 or more.
- the ratio (F5/F3) is 0.80 or more and less than 0.90.
- the ratio (F5/F3) is less than 0.80.
- Adhesion between the partition and the reflective film (sputtering characteristics) A titanium film was formed on the obtained laminate by sputtering at 5 ⁇ 10 ⁇ 3 Pa using a sputtering module (Q150T ES manufactured by Quorum Technologies) to a thickness of 100 nm, and an aluminum film was further formed thereon to a thickness of 500 nm to form a reflective film on the surface of the partition wall.
- the laminate after sputtering was subjected to a reflow treatment for 3 minutes (30 seconds at a peak top temperature of 320° C.).
- the reflective film on the surface of the partition wall of the laminate after the reflow treatment was observed using a microscope (VHX-5000 manufactured by Keyence Corporation). The adhesion between the partition wall and the reflective film was evaluated according to the following criteria.
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Abstract
Description
本発明に係る隔壁形成用インクジェット組成物(以下、「インクジェット組成物」と記載することがある)は、インクジェット塗布に用いられる。
(B)光硬化性官能基を有さず、かつ熱硬化性官能基を有する熱硬化性化合物(以下、「(B)熱硬化性化合物」と記載することがある)
(C)光重合開始剤
(D)熱硬化剤
(E)酸化防止剤
(A)光硬化性化合物は、光硬化性官能基を有し、かつ熱硬化性官能基を有するか又は有さない化合物である。上記(A)光硬化性化合物は、熱硬化性官能基を有していてもよく、有していなくてもよい。上記(A)光硬化性化合物は、光及び熱硬化性化合物であってもよい。
(B)熱硬化性化合物は、光硬化性官能基を有さず、かつ熱硬化性官能基を有する。
上記インクジェット組成物は、(C)光重合開始剤を含む。
上記インクジェット組成物は、(D)熱硬化剤を含む。上記(D)熱硬化剤は、熱硬化性化合物を熱硬化させる。
上記インクジェット組成物は、(E)酸化防止剤を含む。上記インクジェット組成物は、(E)酸化防止剤を含むので、冷熱サイクル特性を高めることができる。冷熱サイクル特性を高めることができる理由としては、樹脂劣化の原因となる高温時に発生するラジカルが(E)酸化防止剤によりトラップされて、樹脂劣化が抑制されるためであることが考えられる。また、上記インクジェット組成物は、(E)酸化防止剤を含むので、該インクジェット組成物により形成された隔壁の内壁面上に反射膜を形成したときに、隔壁と反射膜との密着性を高めることができる。
上記インクジェット組成物は、上述した成分以外の他の成分を含んでいてもよい。上記他の成分としては、カップリング剤、分散剤、フィラー、レベリング剤、消泡剤、硬化促進剤、溶剤、及び重合禁止剤等が挙げられる。
本発明に係るLEDモジュールは、基板と、上記基板の第1の表面上に配置されたLEDチップと、上記基板の上記第1の表面上に配置された隔壁とを備える。上記LEDモジュールでは、上記隔壁が、上記基板の上記第1の表面上にて、上記LEDチップを囲むように配置されている。上記LEDモジュールでは、上記隔壁が、上述した隔壁形成用インクジェット組成物の硬化物である。
3官能の(メタ)アクリレート化合物:トリメチロールプロパントリアクリレート(ダイセル・オルネクス社製「TMPTA」、単独重合体のガラス転移温度180℃)
2官能の(メタ)アクリレート化合物1:トリシクロデカンジメタノールジアクリレート(ダイセル・オルネクス社製「IRR214K」、ジシクロペンタジエン骨格を有する(メタ)アクリレート化合物、単独重合体のガラス転移温度190℃)
2官能の(メタ)アクリレート化合物2:1,6-ヘキサンジオールジアクリレート(ダイセル・オルネクス社製「HDDA」、単独重合体のガラス転移温度105℃)
2官能の(メタ)アクリレート化合物3:ジプロピレングリコールジアクリレート(ダイセル・オルネクス社製「DPGDA」、単独重合体のガラス転移温度110℃)
2官能の(メタ)アクリレート化合物4:エトキシ化ビスフェノールAジアクリレート
(新中村化学工業社製「APG700」、単独重合体のガラス転移温度65℃)
2官能の(メタ)アクリレート化合物5:1,9-ノナンジオールジアクリレート(大阪有機化学工業社製「1,9-NDDA」、単独重合体のガラス転移温度100℃)
単官能の(メタ)アクリレート化合物:2-エチルヘキシルアクリレート(日本触媒社製「2EHA」、単独重合体のガラス転移温度-30℃)
ハーフエステル(光及び熱硬化性化合物):4-ヒドロキシブチル(メタ)アクリレートグリシジルエーテル(三菱ケミカル社製「4HBAGE」、単独重合体のガラス転移温度-60℃)
エポキシ化合物1:ビスフェノールA型エポキシ化合物(DIC社製「CRP850」、25℃での粘度4500mPa・s(25℃で液状))
エポキシ化合物2:ビスフェノールF型エポキシ化合物(DIC社製「CRP830」、25℃での粘度1300mPa・s(25℃で液状))
エポキシ化合物3:ジシクロペンタジエンジメタノールジグリシジルエーテル(ADEKA社製「EP4088S」、25℃での粘度230mPa・s(25℃で液状))
エポキシ化合物4:ビスフェノールA型エポキシ化合物(日鉄ケミカル&マテリアル社製「YD127」、25℃での粘度9500mPa・s(25℃で液状))
エポキシ化合物5:ジシクロペンタジエン型エポキシ化合物(DIC社製「HP7200L」、25℃で固体)
2-(ジメチルアミノ)-2-[(4-メチルフェニル)メチル]-1-[4-(4-モルフォリニル)フェニル]-1-ブタノン(IGM社製「Irgacure 379」)
1,3-ビス(3-アミノフェノキシ)ベンゼン(三井化学社製「APB-N」)
4,4’-ジアミノ-3,3’-ジエチル-5,5’-ジメチルジフェニルメタン(クミアイ化学工業社製「キュアハードMED-J」)
ジメチルチオトルエンジアミン(ADEKA社製「EH-105L」)
フェノール系酸化防止剤1(ADEKA社製「アデカスタブAO-60」)
フェノール系酸化防止剤2(ADEKA社製「アデカスタブAO-80」)
チオエーテル系酸化防止剤(ADEKA社製「アデカスタブAO-503」)
リン系酸化防止剤(ADEKA社製「アデカスタブPEP-36」)
DBU-オクチル酸塩(サンアプロ社製「UCAT SA102」)
ジブチルジチオカルバミン酸銅(II)(三新化学工業社製「TBT-Cu」)
3-グリシドキシプロピルトリエトキシシラン(信越化学工業社製「KBE-403」)
インクジェット組成物の作製:
表1~5に示す成分を、表1~5に示す配合量(重量%)で配合し、均一に混合して、隔壁形成用インクジェット組成物(インクジェット組成物)を得た。
表面粗さRaが0.4μmの窒化アルミニウム基板を用意した。上記基板の表面上に、得られたインクジェット組成物を、75℃で循環させながら、塗布する工程と、第1の光照射工程(365nmを主波長とするUV-LEDランプ、4000mW/cm2、塗布後0.2秒後に0.1秒間照射)とを繰り返して、幅600μm×長さ5mm×高さ1000μmのBステージ化物を形成した。その後、第2の光照射工程(メタルハライドランプ、1000mW/cm2、10秒間照射)で硬化を進行させた。その後、200℃で1時間加熱し熱硬化させて、基板の表面に隔壁が形成された積層体を得た。
(1)貯蔵安定性
(1-1)保管
得られたインクジェット組成物を、-20℃及び5℃でそれぞれ48時間保管した後、0.2μmメンブレンフィルターを用いてろ過し、析出物があるか否かを観察した。貯蔵安定性(保管)を、以下の基準で判定した。
○○:-20℃及び5℃の双方で析出物なし
○:-20℃及び5℃のいずれか一方で析出物あり
×:-20℃及び5℃の双方で析出物あり
JIS K2283に準拠して、E型粘度計(東機産業社製「TVE22L」)を用いて、得られたインクジェット組成物の粘度が20mPa・sになる温度にて5rpmでの粘度(η1)を測定した。また、インクジェット組成物の粘度が20mPa・sになる温度で12時間加熱した後、該温度にて5rpmでの粘度(η2)を測定した。上記粘度(η2)の、上記粘度(η1)に対する比(η2/η1)を計算した。貯蔵安定性(高温)を、以下の基準で判定した。
○○:比(η2/η1)が、1.0以上1.1未満
○:比(η2/η1)が、1.1以上1.2未満
×:比(η2/η1)が、1.2以上
紫外線照射装置が搭載されたピエゾ方式インクジェットプリンタのインクジェットヘッドを用いて、得られたインクジェット組成物を基板上に塗布した。次いで、塗布されたインクジェット組成物に紫外線を照射してBステージ化物層を形成した。上記塗布工程及び上記光硬化工程を、形成されたBステージ化物層の厚み方向に繰り返した。次いで、得られたBステージ化物層を加熱して熱硬化させ、隔壁を形成した。1)幅300μm及び高さ1000μmの隔壁、2)幅200μm及び高さ1000μmの隔壁、3)幅100μm及び高さ1000μmの隔壁を形成可能であるか否かを、レーザー顕微鏡(オリンパス社製「OLS4100」)を用いて、得られた隔壁の形状を観察して確認した。アスペクト比の大きい隔壁の形成性を、以下の基準で判定した。
○○:1)、2)、3)すべての隔壁を形成可能
○:1)の隔壁は形成できなかったが、2)、3)の隔壁を形成可能
△:1)、2)の隔壁は形成できなかったが、3)の隔壁を形成可能
×:1)、2)、3)すべての隔壁を形成できなかった
(3-1)隔壁の機械的強度(初期)
得られた積層体について、リフロー処理を3分間(ピークトップ温度320℃では30秒間)行った。リフロー処理後の積層体について、顕微鏡(キーエンス社製「VHX-5000」)を用いて、隔壁が基板から剥離しているか、及び隔壁にクラックが発生しているかを観察した。また、リフロー処理前後の積層体について、ダイシェア強度測定装置(Nordson社製「DAGE 4000PXY」)を用いて、刃の長さ2mm、速さ10μm/sの条件で、基板表面から500μmの高さで隔壁を押すことによりダイシェア強度を測定した。リフロー処理前のダイシェア強度をF1、リフロー処理後のダイシェア強度をF2として、比(F2/F1)を計算した。隔壁の機械的強度(初期)を、以下の基準で判定した。
○○:隔壁の剥離やクラックが発生せず、かつ、比(F2/F1)が0.90以上
○:隔壁の剥離やクラックが発生していないが、比(F2/F1)が0.80以上0.90未満
×:隔壁の剥離又はクラックが発生した、又は、比(F2/F1)が0.80未満
得られた積層体について、リフロー処理を3分間(ピークトップ温度320℃では30秒間)行った。リフロー処理後の積層体について、ダイシェア強度測定装置(Nordson社製「DAGE 4000PXY」)を用いて、刃の長さ2mm、速さ10μm/sの条件で、基板表面から125μmの高さで隔壁を押すことによりダイシェア強度F3を測定した。基板と隔壁との密着性(初期)を、以下の基準で判定した。
○○:F3が40N以上
○:F3が30N以上40N未満
×:F3が30N未満
(4-1)隔壁の機械的強度(長期)
上記リフロー処理後の積層体について、-40℃で15分冷却し、昇温速度10℃/分で125℃まで昇温し、125℃で15分加熱し、冷却速度10℃/分で-40℃まで冷却する冷熱サイクルを1サイクルとし、1000回繰り返した。冷熱サイクル試験後の積層体について、ダイシェア強度測定装置(Nordson社製「DAGE 4000PXY」)を用いて、刃の長さ2mm、速さ150μm/sの条件で、基板表面から500μmの高さで隔壁を押すことによりダイシェア強度F4を測定した。隔壁の機械的強度(長期)を、以下の基準で判定した。
○○:F4が3kg以上
○:F4が2kg以上3kg未満
×:F4が2kg未満
上記冷熱サイクル試験後の積層体について、ダイシェア強度測定装置(Nordson社製「DAGE 4000PXY」)を用いて、刃の長さ2mm、速さ10μm/sの条件で、基板表面から125μmの高さで隔壁を押すことによりダイシェア強度F5を測定し、比(F5/F3)を計算した。基板と隔壁との密着性(長期)を、以下の基準で判定した。
○○:比(F5/F3)が0.90以上
○:比(F5/F3)が0.80以上0.90未満
×:比(F5/F3)が0.80未満
得られた積層体について、スパッタモジュール(Quorum Technologies社製「Q150T ES」)を用いて、5×10-3Paで、スパッタリングにて、厚み100nmとなるようにチタン膜を成膜し、さらにその上に厚み500nmとなるようにアルミニウム膜を成膜して、隔壁の表面に反射膜を形成した。スパッタリング後の積層体について、リフロー処理を3分間(ピークトップ温度320℃では30秒間)行った。リフロー処理後の積層体について、顕微鏡(キーエンス社製「VHX-5000」)を用いて、隔壁の表面の反射膜を観察した。隔壁と反射膜との密着性を、以下の基準で判定した。
〇:反射膜の剥離やクラックが発生しなかった
×:反射膜の剥離やクラックが発生した
11…基板
11a…第1の表面
12…LEDチップ
13…隔壁
14…反射膜
Claims (15)
- 光硬化性官能基を有し、かつ熱硬化性官能基を有するか又は有さない光硬化性化合物と、
光硬化性官能基を有さず、かつ熱硬化性官能基を有する熱硬化性化合物と、
光重合開始剤と、
熱硬化剤と、
酸化防止剤とを含み、
前記熱硬化性化合物が、25℃で液状である、隔壁形成用インクジェット組成物。 - 前記酸化防止剤が、フェノール系酸化防止剤を含む、請求項1に記載の隔壁形成用インクジェット組成物。
- 前記熱硬化性化合物が、ビスフェノールA型エポキシ化合物、又はビスフェノールF型エポキシ化合物を含む、請求項1又は2に記載の隔壁形成用インクジェット組成物。
- 前記光硬化性化合物が、(メタ)アクリロイル基を2個以上有し、かつ脂環式骨格を有する光硬化性化合物を含む、請求項1~3のいずれか1項に記載の隔壁形成用インクジェット組成物。
- 前記光硬化性化合物が、(メタ)アクリロイル基を2個以上有し、かつジシクロペンタジエン骨格を有する光硬化性化合物を含む、請求項1~4のいずれか1項に記載の隔壁形成用インクジェット組成物。
- 前記隔壁形成用インクジェット組成物100重量%中、前記光硬化性化合物の含有量が、40重量%以上75重量%以下である、請求項1~5のいずれか1項に記載の隔壁形成用インクジェット組成物。
- 前記隔壁形成用インクジェット組成物100重量%中、前記熱硬化性化合物の含有量が、10重量%以上35重量%以下である、請求項1~6のいずれか1項に記載の隔壁形成用インクジェット組成物。
- 前記隔壁形成用インクジェット組成物100重量%中、前記酸化防止剤の含有量が、0.3重量%以上4重量%以下である、請求項1~7のいずれか1項に記載の隔壁形成用インクジェット組成物。
- 前記光重合開始剤が、アミノアセトフェノン系光重合開始剤を含む、請求項1~8のいずれか1項に記載の隔壁形成用インクジェット組成物。
- 前記熱硬化剤が、芳香族アミン化合物を含む、請求項1~9のいずれか1項に記載の隔壁形成用インクジェット組成物。
- 前記熱硬化剤が、1,3-ビス(3-アミノフェノキシ)ベンゼン、又はビス[4-(3-アミノフェノキシ)フェニル]スルフォンを含む、請求項1~10のいずれか1項に記載の隔壁形成用インクジェット組成物。
- 基板と、
前記基板の第1の表面上に配置されたLEDチップと、
前記基板の前記第1の表面上に配置された隔壁とを備え、
前記隔壁が、前記基板の前記第1の表面上にて、前記LEDチップを囲むように配置されており、
前記隔壁が、請求項1~11のいずれか1項に記載の隔壁形成用インクジェット組成物の硬化物である、LEDモジュール。 - 前記隔壁の内壁面上に反射膜をさらに備える、請求項12に記載のLEDモジュール。
- 基板と、前記基板の第1の表面上に配置されたLEDチップとを備える電子部品を用いて、
前記電子部品における前記基板の前記第1の表面上に、請求項1~11のいずれか1項に記載の隔壁形成用インクジェット組成物をインクジェット方式により塗布して、インクジェット組成物層を形成する工程と、
前記インクジェット組成物層を硬化させて、前記基板の前記第1の表面上に隔壁を形成する工程を備え、
得られるLEDモジュールにおいて、前記隔壁が、前記基板の前記第1の表面上にて、前記LEDチップを囲むように配置されており、前記隔壁が、前記隔壁形成用インクジェット組成物の硬化物である、LEDモジュールの製造方法。 - 前記隔壁の内壁面上に、反射膜を配置する工程を備える、請求項14に記載のLEDモジュールの製造方法。
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| CN202480004943.3A CN120225621A (zh) | 2023-03-28 | 2024-03-25 | 隔壁形成用喷墨组合物、led模块及led模块的制造方法 |
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| WO2013024764A1 (ja) * | 2011-08-12 | 2013-02-21 | ダイキン工業株式会社 | 撥液性硬化性インク組成物 |
| JP2020182948A (ja) * | 2014-10-24 | 2020-11-12 | Agc株式会社 | 隔壁の修復方法、修復された隔壁、および光学素子 |
| JP2020205417A (ja) * | 2019-06-12 | 2020-12-24 | 東レ株式会社 | マイクロledディスプレイ装置 |
| WO2022260049A1 (ja) * | 2021-06-09 | 2022-12-15 | 積水化学工業株式会社 | インクジェット用及び隔壁形成用硬化性組成物、発光デバイス及び発光デバイスの製造方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013024764A1 (ja) * | 2011-08-12 | 2013-02-21 | ダイキン工業株式会社 | 撥液性硬化性インク組成物 |
| JP2020182948A (ja) * | 2014-10-24 | 2020-11-12 | Agc株式会社 | 隔壁の修復方法、修復された隔壁、および光学素子 |
| JP2020205417A (ja) * | 2019-06-12 | 2020-12-24 | 東レ株式会社 | マイクロledディスプレイ装置 |
| WO2022260049A1 (ja) * | 2021-06-09 | 2022-12-15 | 積水化学工業株式会社 | インクジェット用及び隔壁形成用硬化性組成物、発光デバイス及び発光デバイスの製造方法 |
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| JPWO2024204093A1 (ja) | 2024-10-03 |
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