WO2018055766A1 - 硬化性組成物、波長変換材、バックライトユニット、及び画像表示装置 - Google Patents
硬化性組成物、波長変換材、バックライトユニット、及び画像表示装置 Download PDFInfo
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- WO2018055766A1 WO2018055766A1 PCT/JP2016/078276 JP2016078276W WO2018055766A1 WO 2018055766 A1 WO2018055766 A1 WO 2018055766A1 JP 2016078276 W JP2016078276 W JP 2016078276W WO 2018055766 A1 WO2018055766 A1 WO 2018055766A1
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
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Definitions
- the present disclosure relates to a curable composition, a wavelength conversion material, a backlight unit, and an image display device.
- the wavelength conversion material including the quantum dot phosphor is disposed, for example, in the backlight unit of the image display device.
- a wavelength conversion material that includes a quantum dot phosphor that emits red light and a quantum dot phosphor that emits green light light is emitted from the quantum dot phosphor when the wavelength conversion material is irradiated with blue light as excitation light.
- White light can be obtained by the red light and green light that have been emitted and the blue light that has passed through the wavelength conversion material.
- NTSC National Television System Committee
- the wavelength conversion material containing a quantum dot phosphor usually has a cured product obtained by curing a curable composition containing the quantum dot phosphor.
- the curable composition includes a thermosetting type and a photocurable type, and a photocurable type curable composition is preferably used from the viewpoint of productivity.
- the wavelength conversion material containing quantum dot fluorescent substance at least one part of the hardened
- a barrier film having a barrier property against at least one of oxygen and water may be provided on one side or both sides of a cured product layer containing a quantum dot phosphor.
- the adhesion between the cured material containing the quantum dot phosphor and the coating material becomes important. If the adhesive between the cured product containing the quantum dot phosphor and the coating material is not sufficient, the coating material may be peeled off when, for example, the wavelength conversion material is cut out to a specified size (for example, punched by a punching device). There is.
- the photocurable curable composition containing the quantum dot phosphor has a lower adhesion between the cured product containing the quantum dot phosphor and the coating material than the thermosetting curable composition. There was a trend.
- the present disclosure provides a curable composition containing a quantum dot phosphor and having excellent adhesion of a cured product, a wavelength conversion material using the curable composition, a backlight unit, and an image display device. This is the issue.
- a curable composition containing a (meth) allyl compound, a (meth) acryl compound, a photopolymerization initiator, and a quantum dot phosphor containing a (meth) allyl compound, a (meth) acryl compound, a photopolymerization initiator, and a quantum dot phosphor.
- ⁇ 4> The curable composition according to any one of ⁇ 1> to ⁇ 3>, wherein the quantum dot phosphor includes a compound containing at least one of Cd and In.
- ⁇ 9> Any one of ⁇ 5> to ⁇ 8>, wherein the loss tangent (tan ⁇ ) of the cured product measured by dynamic viscoelasticity measurement at a frequency of 10 Hz and a temperature of 25 ° C. is 0.4 to 1.5.
- the wavelength conversion material according to item.
- a backlight unit comprising the wavelength conversion material according to any one of ⁇ 5> to ⁇ 9> and a light source.
- An image display device comprising the backlight unit according to ⁇ 10>.
- a curable composition containing a quantum dot phosphor and excellent in adhesion of a cured product, and a wavelength conversion material, a backlight unit, and an image display device using the curable composition are provided. be able to.
- the content ratio of each component in the composition means the total content ratio of the plurality of types of substances when there are a plurality of types of substances corresponding to each component in the composition unless otherwise specified. .
- the term “layer” refers to the case where the layer is formed only in a part of the region in addition to the case where the layer is formed over the entire region. Is also included.
- laminate indicates that layers are stacked, and two or more layers may be combined, or two or more layers may be detachable.
- the term “process” includes a process that is independent of other processes and includes the process if the purpose of the process is achieved even if it cannot be clearly distinguished from the other processes. It is.
- (meth) allyl means allyl or methallyl
- (meth) acryl means acryl or methacryl
- (meth) acryloyl means acryloyl or methacryloyl
- (Meth) acrylate means acrylate or methacrylate.
- the curable composition of this embodiment contains a (meth) allyl compound, a (meth) acryl compound, a photopolymerization initiator, and a quantum dot phosphor.
- the curable composition of this embodiment may further contain other components such as a thiol compound described later, as necessary.
- the curable composition of this embodiment is excellent in the adhesiveness of hardened
- the (meth) allyl compound means a compound having a (meth) allyl group in the molecule
- the (meth) acrylic compound means a compound having a (meth) acryloyl group in the molecule.
- a compound having both a (meth) allyl group and a (meth) acryloyl group in the molecule is classified as a (meth) allyl compound for convenience.
- the curable composition of this embodiment contains a (meth) allyl compound.
- the (meth) allyl compound may be a monofunctional (meth) allyl compound having one (meth) allyl group in one molecule, or a polyfunctional compound having two or more (meth) allyl groups in one molecule. It may be a functional (meth) allyl compound.
- the (meth) allyl compound preferably contains a polyfunctional (meth) allyl compound.
- the ratio of the polyfunctional (meth) allyl compound to the total amount of the (meth) allyl compound is, for example, preferably 80% by mass or more, more preferably 90% by mass or more, and further preferably 100% by mass. preferable.
- monofunctional (meth) allyl compounds include (meth) allyl acetate, (meth) allyl n-propionate, (meth) allyl benzoate, (meth) allylphenyl acetate, (meth) allylphenoxyacetate, (meth) Examples include allyl methyl ether and (meth) allyl glycidyl ether.
- polyfunctional (meth) allyl compounds include di (meth) allyl benzenedicarboxylate, di (meth) allyl cyclohexanedicarboxylate, di (meth) allyl maleate, di (meth) allyl adipate, di (meth) Allyl phthalate, di (meth) allyl isophthalate, di (meth) allyl terephthalate, glycerin di (meth) allyl ether, trimethylolpropane di (meth) allyl ether, pentaerythritol di (meth) allyl ether, 1,3-di (Meth) allyl-5-glycidyl isocyanurate, tri (meth) allyl cyanurate, tri (meth) allyl isocyanurate, tri (meth) allyl trimellitate, tetra (meth) allyl pyromellitate, 1,3,4
- the curable composition of the present embodiment may contain one kind of (meth) allyl compound alone, or may contain two or more kinds of (meth) allyl compounds in combination.
- (meth) allyl compound tri (meth) allyl cyanurate, tri (meth) allyl isocyanurate, benzenedicarboxylate di (meth) allyl, and cyclohexanedicarboxylate di from the viewpoint of heat resistance and heat and moisture resistance of the cured product.
- At least one selected from the group consisting of (meth) allyl is preferable, and tri (meth) allyl isocyanurate is more preferable.
- the content of the (meth) allyl compound in the curable composition is preferably, for example, 10% by mass to 50% by mass, and preferably 15% by mass to 45% by mass with respect to the total amount of the curable composition. More preferably, the content is 20% by mass to 40% by mass.
- the content rate of the (meth) allyl compound is 10% by mass or more, the heat resistance and moist heat resistance of the cured product tend to be further improved, and when the content rate of the (meth) allyl compound is 50% by mass or less, There exists a tendency for the adhesiveness of hardened
- the curable composition of this embodiment contains a (meth) acryl compound.
- the (meth) acrylic compound may be a monofunctional (meth) acrylic compound having one (meth) acryloyl group in one molecule, or a polyfunctional compound having two or more (meth) acryloyl groups in one molecule. It may be a functional (meth) acryl compound.
- the (meth) acrylic compound preferably contains a monofunctional (meth) acrylic compound.
- the ratio of the monofunctional (meth) acrylic compound to the total amount of the (meth) acrylic compound is, for example, preferably 80% by mass or more, more preferably 90% by mass or more, and further preferably 100% by mass. preferable.
- monofunctional (meth) acrylic compounds include (meth) acrylic acid; methyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isononyl (meth) ) Acrylate, n-octyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, etc.
- alkyl (meth) acrylates having 1 to 18 carbon atoms benzyl (meth) acrylate, phenoxyethyl ( (Meth) acrylate compounds having an aromatic ring such as (meth) acrylate; alkoxyalkyl (meth) acrylates such as butoxyethyl (meth) acrylate; aminoalkyl (meth) acrylates such as N, N-dimethylaminoethyl (meth) acrylate
- G Diethylene glycol monoethyl ether (meth) acrylate, triethylene glycol monobutyl ether (meth) acrylate, tetraethylene glycol monomethyl ether (meth) acrylate, hexaethylene glycol monomethyl ether (meth) acrylate, octaethylene glycol monomethyl ether (meth) acrylate , Polyalkylene glycol monoalkyl ethers such as nonaethylene glycol monomethyl ether (meth) acrylate
- (Meth) acrylate compounds having a glycidyl group (meth) acrylate compounds having an isocyanate group such as 2- (2- (meth) acryloyloxyethyloxy) ethyl isocyanate and 2- (meth) acryloyloxyethyl isocyanate; tetraethylene Polyalkylene glycols such as glycol mono (meth) acrylate, hexaethylene glycol mono (meth) acrylate, and octapropylene glycol mono (meth) acrylate Mono (meth) acrylate; (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N, N-diethyl (meth) acrylamide And (meth) acrylamide compounds such as 2-hydroxyethyl (meth) acrylamide;
- polyfunctional (meth) acrylic compound examples include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, and the like.
- the curable composition of the present embodiment may contain one type of (meth) acrylic compound alone, or may contain two or more types of (meth) acrylic compounds in combination.
- the (meth) acrylic compound is preferably a monofunctional (meth) acrylate compound having an alicyclic ring, more preferably isobornyl (meth) acrylate, from the viewpoint of further improving the heat resistance and moist heat resistance of the cured product.
- a monofunctional methacrylate compound is preferable from a viewpoint of improving the storage stability of a curable composition more.
- An example of a particularly preferred (meth) acrylic compound is isobornyl methacrylate.
- the content of the (meth) acrylic compound in the curable composition is preferably, for example, 1% by mass to 50% by mass with respect to the total amount of the curable composition, and is 5% by mass to 40% by mass. More preferably, the content is 10% by mass to 30% by mass.
- the content of the (meth) acrylic compound is 1% by mass or more, the storage stability of the curable composition and the adhesiveness of the cured product tend to be further improved, and the content of the (meth) acrylic compound is 50% by mass. When it is at most%, the heat resistance and heat and humidity resistance of the cured product tend to be improved.
- the curable composition of this embodiment contains a photopolymerization initiator.
- the photopolymerization initiator is not particularly limited, and examples thereof include compounds that generate radicals upon irradiation with active energy rays such as ultraviolet rays.
- the photopolymerization initiator include benzophenone, N, N′-tetraalkyl-4,4′-diaminobenzophenone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propanone-1,4,4′-bis (dimethylamino) benzophenone (also referred to as “Michler ketone”), 4,4′-bis (Diethylamino) benzophenone, 4-methoxy-4′-dimethylaminobenzophenone, 1-hydroxycyclohexyl phenyl ketone, 1- (4-isopropylphenyl) 2-hydroxy-2-methylpropan-1-one, 1- (4- ( 2-Hydroxyethoxy) -phenyl) -2-hydroxy-2-methyl-1-propane-1- , Aromatic compounds such as 2-hydroxy-2-methyl
- the photopolymerization initiator is preferably at least one selected from the group consisting of an acylphosphine oxide compound, an aromatic ketone compound, and an oxime ester compound from the viewpoint of curability, and includes an acylphosphine oxide compound and an aromatic ketone compound. At least one selected from the group consisting of these is more preferable, and acylphosphine oxide compounds are more preferable.
- the content of the photopolymerization initiator in the curable composition is preferably, for example, 0.1% by mass to 5% by mass, and preferably 0.1% by mass to 3% by mass with respect to the total amount of the curable composition. %, More preferably 0.5% by mass to 1.5% by mass.
- the content of the photopolymerization initiator is 0.1% by mass or more, the sensitivity of the curable composition tends to be sufficient, and when the content of the photopolymerization initiator is 5% by mass or less, There exists a tendency for the influence on the hue of a curable composition and the fall of storage stability to be suppressed.
- the curable composition of this embodiment contains a quantum dot phosphor.
- the quantum dot phosphor is not particularly limited, and examples thereof include particles containing at least one selected from the group consisting of II-VI group compounds, III-V group compounds, IV-VI group compounds, and IV group compounds. From the viewpoint of luminous efficiency, the quantum dot phosphor preferably contains a compound containing at least one of Cd and In.
- II-VI group compounds include CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeS, HgSeT, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, GdHgSe, ST Specific examples of the III-V group compounds include GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, In
- IV-VI group compounds include SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, Sn, etc. .
- group IV compound include Si
- Quantum dot phosphors preferably have a core-shell structure.
- the quantum efficiency of the quantum dot phosphor can be further improved.
- core / shell examples include CdSe / ZnS, InP / ZnS, PbSe / PbS, CdSe / CdS, CdTe / CdS, CdTe / ZnS, and the like.
- the quantum dot phosphor may have a so-called core multishell structure in which the shell has a multilayer structure.
- the quantum efficiency of the quantum dot phosphor can be further improved. Is possible.
- the curable composition of the present embodiment may contain one kind of quantum dot phosphor alone or may contain two or more kinds of quantum dot phosphors in combination.
- an embodiment containing two or more types of quantum dot phosphors in combination for example, an embodiment containing two or more types of quantum dot phosphors having the same average particle diameter but different components, the same components having different average particle sizes
- the aspect containing 2 or more types of quantum dot fluorescent substance to perform and the aspect containing 2 or more types of quantum dot fluorescent substance from which a component and an average particle diameter differ are mentioned. By changing at least one of the components of the quantum dot phosphor and the average particle diameter, the emission center wavelength of the quantum dot phosphor can be changed.
- the curable composition of the present embodiment includes a quantum dot phosphor G having an emission center wavelength in a green wavelength range of 520 nm to 560 nm and a quantum dot fluorescence having an emission center wavelength in a red wavelength range of 600 nm to 680 nm.
- the body R may be contained.
- a cured product of a curable composition containing the quantum dot phosphor G and the quantum dot phosphor R is irradiated with excitation light in a blue wavelength region of 430 nm to 480 nm
- the quantum dot phosphor G and the quantum dot phosphor Green light and red light are emitted from R, respectively.
- white light can be obtained by the green light and red light emitted from the quantum dot phosphor G and the quantum dot phosphor R and the blue light transmitted through the cured product.
- the content of the quantum dot phosphor in the curable composition is preferably, for example, 1% by mass to 10% by mass, and preferably 4% by mass to 10% by mass with respect to the total amount of the curable composition. Is more preferably 4% by mass to 7% by mass.
- the content of the quantum dot phosphor is 1% by mass or more, sufficient light emission intensity tends to be obtained when the cured product is irradiated with excitation light, and the content of the quantum dot phosphor is 10% by mass or less. When it exists, it exists in the tendency for aggregation of a quantum dot fluorescent substance to be suppressed.
- the curable composition of this embodiment may further contain a thiol compound.
- a thiol compound When the curable composition further contains a thiol compound, an enethiol reaction proceeds between the (meth) allyl compound and the thiol compound when the curable composition is cured, and the adhesion of the cured product is further improved. There is a tendency. Moreover, it exists in the tendency for the optical characteristic of hardened
- the curable composition of this embodiment also has storage stability even when it further contains a thiol compound. Excellent. This is presumably because the curable composition of this embodiment contains a (meth) acrylic compound.
- the thiol compound may be a monofunctional thiol compound having one thiol group in one molecule or a polyfunctional thiol compound having two or more thiol groups in one molecule. From the viewpoint of further improving the adhesion, heat resistance, and moist heat resistance of the cured product, the thiol compound preferably contains a polyfunctional thiol compound.
- the ratio of the polyfunctional thiol compound to the total amount of the thiol compound is, for example, preferably 80% by mass or more, more preferably 90% by mass or more, and further preferably 100% by mass.
- monofunctional thiol compounds include hexanethiol, 1-heptanethiol, 1-octanethiol, 1-nonanethiol, 1-decanethiol, 3-mercaptopropionic acid, methyl mercaptopropionate, methoxybutyl mercaptopropionate, Examples include octyl mercaptopropionate, tridecyl mercaptopropionate, 2-ethylhexyl-3-mercaptopropionate, n-octyl-3-mercaptopropionate, and the like.
- polyfunctional thiol compound examples include ethylene glycol bis (3-mercaptopropionate), diethylene glycol bis (3-mercaptopropionate), tetraethylene glycol bis (3-mercaptopropionate), 1,2- Propylene glycol bis (3-mercaptopropionate), diethylene glycol bis (3-mercaptobutyrate), 1,4-butanediol bis (3-mercaptopropionate), 1,4-butanediol bis (3-mercaptobutyrate) Rate), 1,8-octanediol bis (3-mercaptopropionate), 1,8-octanediol bis (3-mercaptobutyrate), hexanediol bisthioglycolate, trimethylolpropane tris (3-mercaptopropiate) Onee ), Trimethylolpropane tris (3-mercaptobutyrate), trimethylolpropane tris (3-mercaptoisobutyrate), trimethylol
- the polyfunctional thiol compound may be in the state of a thioether oligomer that has been reacted with a polyfunctional (meth) acrylic compound in advance.
- the thioether oligomer can be obtained by addition polymerization of a polyfunctional thiol compound and a polyfunctional (meth) acryl compound in the presence of a polymerization initiator.
- the ratio of the number of equivalents of thiol groups of the polyfunctional thiol compound to the number of equivalents of (meth) acryloyl groups of the polyfunctional (meth) acrylic compound is, for example, 3 It is preferably from 0.0 to 3.3, more preferably from 3.0 to 3.2, and even more preferably from 3.05 to 3.15.
- the weight average molecular weight of the thioether oligomer is, for example, preferably 3000 to 10,000, more preferably 3000 to 8000, and still more preferably 4000 to 6000.
- the weight average molecular weight of the thioether oligomer is determined by conversion using a standard polystyrene calibration curve from the molecular weight distribution measured using gel permeation chromatography (GPC), as shown in the examples described later. .
- the thiol equivalent of the thioether oligomer is, for example, preferably 200 g / eq to 400 g / eq, more preferably 250 g / eq to 350 g / eq, and further preferably 250 g / eq to 270 g / eq. preferable.
- thioether oligomers pentaerythritol tetrakis (3-mercaptopropionate) and tris (2-hydroxyethyl) isocyanurate triacrylate are added from the viewpoint of further improving the optical properties, heat resistance, and moist heat resistance of the cured product.
- a thioether oligomer obtained by polymerization is preferred.
- the content of the thiol compound in the curable composition is preferably 40% by mass to 80% by mass with respect to the total amount of the curable composition, It is more preferably 50% by mass to 80% by mass, and further preferably 50% by mass to 70% by mass.
- the content of the thiol compound is 40% by mass or more, the adhesiveness of the cured product tends to be further improved, and when the content of the thiol compound is 80% by mass or less, the heat resistance and heat and humidity resistance of the cured product are increased. It tends to improve.
- the curable composition of this embodiment may further contain a liquid medium.
- a liquid medium means a medium in a liquid state at room temperature (25 ° C.).
- liquid medium examples include acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl isopropyl ketone, methyl-n-butyl ketone, methyl isobutyl ketone, methyl-n-pentyl ketone, methyl-n-hexyl ketone, diethyl ketone, Ketone solvents such as dipropyl ketone, diisobutyl ketone, trimethylnonanone, cyclohexanone, cyclopentanone, methylcyclohexanone, 2,4-pentanedione, acetonylacetone; diethyl ether, methyl ethyl ether, methyl-n-propyl ether, diisopropyl Ether, tetrahydrofuran, methyltetrahydrofuran, dioxane, dimethyldioxane, ethylene glycol dimethyl ether
- Glycol monoether solvents such as Terpene solvents such as terpinene, terpineol, myrcene, alloocimene, limonene, dipentene, pinene, carvone, oximene, and ferrandylene; straight silicone oils such as dimethyl silicone oil, methylphenyl silicone oil, and methylhydrogen silicone oil Amino-modified silicone oil, epoxy-modified silicone oil, cal Xyoxy-modified silicone oil, carbinol-modified silicone oil, mercapto-modified silicone oil, heterogeneous functional group-modified silicone oil, polyether-modified silicone oil, methylstyryl-modified silicone oil, hydrophilic specially-modified silicone oil, higher alkoxy-modified silicone oil, higher fatty acid Modified silicone oil such as modified silicone oil and fluorine-modified silicone oil; butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, oct
- the content of the liquid medium in the curable composition is preferably 1% by mass to 10% by mass with respect to the total amount of the curable composition, It is more preferably 4% by mass to 10% by mass, and further preferably 4% by mass to 7% by mass.
- the curable composition of this embodiment may further contain other components such as a polymerization inhibitor, a silane coupling agent, a surfactant, an adhesion imparting agent, and an antioxidant.
- the curable composition of this embodiment may contain 1 type individually about each of the other components, and may contain it in combination of 2 or more types.
- the curable composition of this embodiment is a conventional method in which other components such as a (meth) allyl compound, a (meth) acrylic compound, a photopolymerization initiator, a quantum dot phosphor, and a thiol compound and a liquid medium are used as necessary.
- a (meth) allyl compound such as a (meth) acrylic compound, a photopolymerization initiator, a quantum dot phosphor, and a thiol compound and a liquid medium are used as necessary.
- the quantum dot phosphor is preferably mixed while being dispersed in a liquid medium.
- the wavelength conversion material of this embodiment has the hardened
- the wavelength conversion material of this embodiment may further have other constituent materials such as a coating material to be described later, if necessary.
- the shape of the cured product is not particularly limited, and examples thereof include a film shape and a lens shape.
- the cured product is preferably in the form of a film.
- the average thickness of the cured product is, for example, preferably 50 ⁇ m to 200 ⁇ m, more preferably 50 ⁇ m to 150 ⁇ m, and still more preferably 80 ⁇ m to 120 ⁇ m.
- the average thickness is 50 ⁇ m or more, the wavelength conversion efficiency tends to be further improved, and when the average thickness is 200 ⁇ m or less, the backlight unit tends to be thinner when applied to the backlight unit described later. is there.
- the average thickness of the film-like cured product is obtained, for example, as an arithmetic average value of thicknesses at arbitrary three locations measured using a micrometer.
- the cured product may be one obtained by curing one kind of curable composition, or may be obtained by curing two or more kinds of curable compositions.
- the cured product when the cured product is a film, the cured product emits light from the first cured product layer obtained by curing the curable composition containing the first quantum dot phosphor and the first quantum dot phosphor.
- a second cured product layer obtained by curing a curable composition containing second quantum dot phosphors having different characteristics may be laminated.
- the cured product can be obtained by forming a coating film, a molded product or the like of the curable composition, performing a drying treatment as necessary, and then irradiating active energy rays such as ultraviolet rays.
- the wavelength and irradiation amount of the active energy ray can be appropriately set according to the composition of the curable composition. In one aspect, it is irradiated with ultraviolet rays having a wavelength of 280 nm ⁇ 400 nm at an irradiation amount of 100mJ / cm 2 ⁇ 5000mJ / cm 2.
- Examples of the ultraviolet light source include a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, a chemical lamp, a black light lamp, and a microwave-excited mercury lamp.
- the cured product preferably has a loss tangent (tan ⁇ ) measured by dynamic viscoelasticity measurement at a frequency of 10 Hz and a temperature of 25 ° C. of 0.4 to 1.5. It is more preferably 4 to 1.2, and still more preferably 0.4 to 0.6.
- the loss tangent (tan ⁇ ) of the cured product can be measured using a dynamic viscoelasticity measuring apparatus (for example, Solid Analyzer RSA-III manufactured by Rheometric Scientific).
- the cured product preferably has a glass transition temperature (Tg) of 25 ° C. to 40 ° C., more preferably 25 ° C. to 35 ° C., from the viewpoint of further improving adhesion, heat resistance, and moist heat resistance.
- Tg glass transition temperature
- the temperature is 30 ° C to 35 ° C.
- the glass transition temperature (Tg) of the cured product can be measured using a dynamic viscoelasticity measuring device (for example, Rheometric Scientific, Solid Analyzer RSA-III).
- the cured product has a storage elastic modulus of 1 ⁇ 10 7 Pa to 1 ⁇ 10 9 Pa measured under conditions of a frequency of 10 Hz and a temperature of 25 ° C. from the viewpoint of further improving the adhesion, heat resistance, and moist heat resistance. It is preferably 5 ⁇ 10 7 Pa to 1 ⁇ 10 9 Pa, more preferably 5 ⁇ 10 7 Pa to 5 ⁇ 10 8 Pa.
- the storage elastic modulus of the cured product can be measured using a dynamic viscoelasticity measuring apparatus (for example, Solid Analyzer RSA-III manufactured by Rheometric Scientific).
- the wavelength conversion material of the present embodiment may be one in which at least a part of the cured product is coated with a coating material.
- a coating material For example, when the cured product is in the form of a film, one side or both sides of the film-like cured product may be covered with a film-shaped coating material.
- the covering material preferably has a barrier property against at least one of oxygen and water, and more preferably has a barrier property against both oxygen and water, from the viewpoint of suppressing a decrease in light emission efficiency of the quantum dot phosphor.
- the covering material having a barrier property against at least one of oxygen and water is not particularly limited, and a known covering material such as a barrier film having an inorganic layer can be used.
- the average thickness of the coating material is, for example, preferably 100 ⁇ m to 150 ⁇ m, more preferably 100 ⁇ m to 140 ⁇ m, and still more preferably 100 ⁇ m to 135 ⁇ m.
- the average thickness is 100 ⁇ m or more, functions such as barrier properties tend to be sufficient, and when the average thickness is 150 ⁇ m or less, a decrease in light transmittance tends to be suppressed.
- the average thickness of the film-like coating material is determined in the same manner as the film-like cured product.
- the oxygen permeability of the coating material is, for example, preferably 0.5 mL / (m 2 ⁇ 24 h ⁇ atm) or less, more preferably 0.3 mL / (m 2 ⁇ 24 h ⁇ atm) or less, 0 More preferably, it is 1 mL / (m 2 ⁇ 24 h ⁇ atm) or less.
- the oxygen permeability of the covering material can be measured using an oxygen permeability measuring device (for example, OX-TRAN, manufactured by MOCON) at a temperature of 23 ° C. and a relative humidity of 65%.
- the water vapor transmission rate of the coating material is preferably 5 ⁇ 10 ⁇ 2 g / (m 2 ⁇ 24 h ⁇ Pa) or less, for example, and preferably 1 ⁇ 10 ⁇ 2 g / (m 2 ⁇ 24 h ⁇ Pa) or less. More preferably, it is 5 ⁇ 10 ⁇ 3 g / (m 2 ⁇ 24 h ⁇ Pa) or less.
- the water vapor transmission rate of the coating material can be measured using a water vapor transmission rate measuring device (for example, AQUATRAN, manufactured by MOCON) under conditions of a temperature of 40 ° C. and a relative humidity of 90%.
- the wavelength conversion material of the present embodiment preferably has a total light transmittance of 55% or more, more preferably 60% or more, and 65% or more from the viewpoint of further improving the light utilization efficiency. Is more preferable.
- the total light transmittance of the wavelength conversion material can be measured according to the measurement method of JIS K 7136: 2000.
- the haze is preferably 95% or more, more preferably 97% or more, and 99% or more from the viewpoint of further improving the light utilization efficiency. Further preferred.
- the haze of the wavelength conversion material can be measured according to the measurement method of JIS K 7136: 2000.
- wavelength conversion material of this embodiment is not limited to the structure of FIG.
- covering material in FIG. 1 is notional, The relative relationship of a magnitude
- cured product layer 11 that is a cured product in the form of a film
- film-shaped coating materials 12A and 12B provided on both surfaces of the cured product layer 11.
- the types and average thicknesses of the covering material 12A and the covering material 12B may be the same or different.
- 1 can be manufactured by, for example, the following known manufacturing method.
- a curable composition is applied to the surface of a film-like coating material (hereinafter also referred to as “first coating material”) that is continuously conveyed to form a coating film.
- first coating material a film-like coating material
- a method for applying the curable composition is not particularly limited, and examples thereof include a die coating method, a curtain coating method, an extrusion coating method, a rod coating method, and a roll coating method.
- second coating material a film-like coating material that is continuously conveyed is bonded onto the coating film of the curable composition.
- the coating film is cured to form a cured product layer.
- the wavelength conversion material of the structure shown in FIG. 1 can be obtained by cutting out to a regular size.
- the coating layer is irradiated with active energy rays before the second coating material is bonded to the cured product layer. May be formed.
- the backlight unit of the present embodiment includes the above-described wavelength conversion material of the present embodiment and a light source.
- the backlight unit is preferably a multi-wavelength light source from the viewpoint of improving color reproducibility.
- blue light having an emission center wavelength in a wavelength range of 430 nm to 480 nm, an emission intensity peak having a half width of 100 nm or less, and an emission center wavelength in a wavelength range of 520 nm to 560 nm
- the half-value width of the emission intensity peak means a peak width at half the peak height.
- the emission center wavelength of the blue light emitted from the backlight unit is preferably in the range of 440 nm to 475 nm.
- the emission center wavelength of the green light emitted from the backlight unit is preferably in the range of 520 nm to 545 nm.
- the emission center wavelength of red light emitted from the backlight unit is preferably in the range of 610 nm to 640 nm.
- the half-value widths of the emission intensity peaks of blue light, green light, and red light emitted by the backlight unit are all preferably 80 nm or less, and 50 nm or less. More preferably, it is more preferably 40 nm or less, particularly preferably 30 nm or less, and particularly preferably 25 nm or less.
- the light source of the backlight unit for example, a light source that emits blue light having an emission center wavelength in a wavelength region of 430 nm to 480 nm can be used.
- the light source include an LED (Light Emitting Diode) and a laser.
- the wavelength conversion material preferably includes at least a quantum dot phosphor R that emits red light and a quantum dot phosphor G that emits green light. Thereby, white light can be obtained from the red light and the green light emitted from the wavelength conversion material and the blue light transmitted through the wavelength conversion material.
- the light source of the backlight unit for example, a light source that emits ultraviolet light having an emission center wavelength in a wavelength region of 300 nm to 430 nm can be used.
- the light source include an LED and a laser.
- the wavelength conversion material preferably includes the quantum dot phosphor R and the quantum dot phosphor G, and the quantum dot phosphor B that emits blue light when excited by excitation light. Thereby, white light can be obtained from the red light, the green light, and the blue light emitted from the wavelength conversion material.
- the backlight unit of this embodiment may be an edge light type or a direct type.
- FIG. 2 An example of a schematic configuration of an edge light type backlight unit is shown in FIG.
- the backlight unit of the present embodiment is not limited to the configuration of FIG.
- size of the member in FIG. 2 is notional, The relative relationship of the magnitude
- the backlight unit 20 shown in FIG. 2 includes a light source 21 for emitting the blue light L B, a light guide plate 22 to be emitted guiding the blue light L B emitted from the light source 21, the light guide plate 22 and disposed to face A wavelength conversion material 10, a retroreflective member 23 disposed opposite to the light guide plate 22 via the wavelength conversion material 10, and a reflection plate 24 disposed opposite to the wavelength conversion material 10 via the light guide plate 22.
- Wavelength converting material 10 emits the red light L R and the green light L G part of the blue light L B as the excitation light, the red light L and R and the green light L G, the blue light was not the excitation light L B is emitted.
- the red light L R, the green light L G, and the blue light L B, the white light L W is emitted from the retroreflective member 23.
- the image display apparatus of this embodiment includes the backlight unit of this embodiment described above.
- the image display device is not particularly limited, and examples thereof include a liquid crystal display device.
- FIG. 3 An example of a schematic configuration of the liquid crystal display device is shown in FIG.
- the liquid crystal display device of the present embodiment is not limited to the configuration of FIG.
- size of the member in FIG. 3 is notional, The relative relationship of the magnitude
- the 3 includes a backlight unit 20 and a liquid crystal cell unit 31 disposed to face the backlight unit 20.
- the liquid crystal cell unit 31 is configured such that the liquid crystal cell 32 is disposed between the polarizing plate 33A and the polarizing plate 33B.
- the driving method of the liquid crystal cell 32 is not particularly limited, and is a TN (Twisted Nematic) method, an STN (Super Twisted Nematic) method, a VA (Virtical Alignment) method, an IPS (In-Place-Switching) method, an OCB (Optically Compensated Birefringence). The method etc. are mentioned.
- a weight average molecular weight is the value determined by converting using the calibration curve of a standard polystyrene by the following apparatus and measurement conditions using a gel permeation chromatography.
- 5 sample sets PStQuick MP-H, PStQuick B [trade name, manufactured by Tosoh Corp.] were used as standard polystyrene.
- Examples 1 to 5 and Comparative Examples 1 and 2 were prepared by mixing the components shown in Table 1 in the blending amounts (unit: parts by mass) shown in the same table. "-" In Table 1 means not blended.
- the photopolymerization initiator 2,4,6-trimethylbenzoyl-phenyl-ethoxy-phosphine oxide (manufactured by BASF, IRGACURE TPO-L) was used.
- the quantum dot phosphor a CdSe / ZnS (core / shell) dispersion (Nanosys, Gen2 QD Concentrate) was used.
- Each curable composition obtained above was applied onto a 110 ⁇ m thick barrier film (manufactured by Toppan Printing Co., Ltd.) (covering material) to form a coating film.
- a 110 ⁇ m-thick barrier film (manufactured by Toppan Printing Co., Ltd.) (covering material) was bonded onto this coating film and irradiated with ultraviolet rays using an ultraviolet irradiation device (made by Eye Graphics Co., Ltd.) (irradiation amount: 1000 mJ / cm 2 ) to obtain wavelength conversion materials in which coating materials are arranged on both sides of the cured product layer.
- Total light transmittance and haze Each wavelength conversion material obtained above was cut into a size of 50 mm width and 50 mm length to obtain a sample for evaluation.
- required according to the following formula. Haze (%) (Td / Tt) ⁇ 100
- Tt total light transmittance
- Each wavelength conversion material obtained above was cut into dimensions of 25 mm in width and 100 mm in length, and then used in a temperature environment of 25 ° C. using a tensile tester (Orientec Co., Ltd., RTC-1210).
- the single-sided barrier film was peeled off in the 90-degree direction at a tensile speed of 300 mm / min, and the peel strength was measured.
- Viscosity increase rate (%) (Vb / Va) ⁇ 100 Va: Initial viscosity (mPa ⁇ s) Vb: Viscosity after 24 hours (mPa ⁇ s) And the storage stability of the curable composition was evaluated according to the following evaluation criteria. -Evaluation criteria- A: Viscosity increase rate: less than 150% B: Viscosity increase rate: 150% or more and less than 200% C: Viscosity increase rate: 200% or more
- the barrier film of the wavelength conversion material obtained above was peeled off and cut into dimensions of 5 mm width and 40 mm length to obtain a cured product for evaluation. Then, using a wide-range dynamic viscoelasticity measurement apparatus (manufactured by Rheometric Scientific, Solid Analyzer RSA-III), “tensile mode, distance between chucks: 25 mm, frequency: 10 Hz, measurement temperature range: ⁇ 20 ° C. to 100 ° C., ascending Under the condition of “temperature rate: 5 ° C./min”, the storage elastic modulus and loss elastic modulus of the cured product for evaluation at a temperature of 25 ° C. were measured, and the loss tangent (tan ⁇ ) was determined from the ratio. Further, the glass transition temperature (Tg) was determined from the temperature at the peak top portion of the loss tangent (tan ⁇ ).
- the curable compositions of Examples 1 to 5 containing a (meth) allyl compound, a (meth) acrylic compound, a photopolymerization initiator, and a quantum dot phosphor include a (meth) acrylic compound.
- the adhesiveness of the cured product was remarkably excellent.
- SYMBOLS 10 Wavelength conversion material, 11 ... Hardened
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Abstract
Description
<1> (メタ)アリル化合物、(メタ)アクリル化合物、光重合開始剤、及び量子ドット蛍光体を含有する硬化性組成物。
本明細書中に段階的に記載されている数値範囲において、一つの数値範囲で記載された上限値又は下限値は、他の段階的な記載の数値範囲の上限値又は下限値に置き換えてもよい。また、本明細書中に記載されている数値範囲において、その数値範囲の上限値又は下限値は、実施例に示されている値に置き換えてもよい。
本明細書において組成物中の各成分の含有率は、組成物中に各成分に該当する物質が複数種類存在する場合、特に断らない限り、当該複数種類の物質の合計の含有率を意味する。
本明細書において「層」との語には、当該層が存在する領域を観察したときに、当該領域の全体に形成されている場合に加え、当該領域の一部にのみ形成されている場合も含まれる。
本明細書において「積層」との語は、層を積み重ねることを示し、二以上の層が結合されていてもよく、二以上の層が着脱可能であってもよい。
本明細書において「工程」との語には、他の工程から独立した工程に加え、他の工程と明確に区別できない場合であってもその工程の目的が達成されれば、当該工程も含まれる。
本明細書において「(メタ)アリル」とはアリル又はメタリルを意味し、「(メタ)アクリル」とはアクリル又はメタクリルを意味し、「(メタ)アクリロイル」とはアクリロイル又はメタクリロイルを意味し、「(メタ)アクリレート」とはアクリレート又はメタクリレートを意味する。
本実施形態の硬化性組成物は、(メタ)アリル化合物、(メタ)アクリル化合物、光重合開始剤、及び量子ドット蛍光体を含有する。本実施形態の硬化性組成物は、必要に応じて、後述するチオール化合物等の他の成分を更に含有していてもよい。本実施形態の硬化性組成物は、上記構成を有することにより、硬化物の密着性に優れる。
なお、(メタ)アリル化合物は、分子中に(メタ)アリル基を有する化合物を意味し、(メタ)アクリル化合物は、分子中に(メタ)アクリロイル基を有する化合物を意味する。分子中に(メタ)アリル基及び(メタ)アクリロイル基の両方を有する化合物は、便宜上、(メタ)アリル化合物に分類するものとする。
本実施形態の硬化性組成物は、(メタ)アリル化合物を含有する。(メタ)アリル化合物は、1分子中に1個の(メタ)アリル基を有する単官能(メタ)アリル化合物であってもよく、1分子中に2個以上の(メタ)アリル基を有する多官能(メタ)アリル化合物であってもよい。硬化物の密着性をより向上させる観点からは、(メタ)アリル化合物は、多官能(メタ)アリル化合物を含むことが好ましい。(メタ)アリル化合物の全量に対する多官能(メタ)アリル化合物の割合は、例えば、80質量%以上であることが好ましく、90質量%以上であることがより好ましく、100質量%であることが更に好ましい。
本実施形態の硬化性組成物は、(メタ)アクリル化合物を含有する。(メタ)アクリル化合物は、1分子中に1個の(メタ)アクリロイル基を有する単官能(メタ)アクリル化合物であってもよく、1分子中に2個以上の(メタ)アクリロイル基を有する多官能(メタ)アクリル化合物であってもよい。硬化性組成物の保存安定性及び硬化物の密着性をより向上させる観点からは、(メタ)アクリル化合物は、単官能(メタ)アクリル化合物を含むことが好ましい。(メタ)アクリル化合物の全量に対する単官能(メタ)アクリル化合物の割合は、例えば、80質量%以上であることが好ましく、90質量%以上であることがより好ましく、100質量%であることが更に好ましい。
本実施形態の硬化性組成物は、光重合開始剤を含有する。光重合開始剤としては特に制限されず、例えば、紫外線等の活性エネルギー線の照射によりラジカルを発生する化合物が挙げられる。
本実施形態の硬化性組成物は、量子ドット蛍光体を含有する。量子ドット蛍光体としては特に制限されず、II-VI族化合物、III-V族化合物、IV-VI族化合物、及びIV族化合物からなる群より選択される少なくとも1種を含む粒子が挙げられる。発光効率の観点からは、量子ドット蛍光体は、Cd及びInの少なくとも一方を含む化合物を含むことが好ましい。
III-V族化合物の具体例としては、GaN、GaP、GaAs、GaSb、AlN、AlP、AlAs、AlSb、InN、InP、InAs、InSb、GaNP、GaNAs、GaNSb、GaPAs、GaPSb、AlNP、AlNAs、AlNSb、AlPAs、AlPSb、InNP、InNAs、InNSb、InPAs、InPSb、GaAlNP、GaAlNAs、GaAlNSb、GaAlPAs、GaAlPSb、GaInNP、GaInNAs、GaInNSb、GaInPAs、GaInPSb、InAlNP、InAlNAs、InAlNSb、InAlPAs、InAlPSb等が挙げられる。
IV-VI族化合物の具体例としては、SnS、SnSe、SnTe、PbS、PbSe、PbTe、SnSeS、SnSeTe、SnSTe、PbSeS、PbSeTe、PbSTe、SnPbS、SnPbSe、SnPbTe、SnPbSSe、SnPbSeTe、SnPbSTe等が挙げられる。
IV族化合物の具体例としては、Si、Ge、SiC、SiGe等が挙げられる。
本実施形態の硬化性組成物は、チオール化合物を更に含有していてもよい。硬化性組成物がチオール化合物を更に含有することで、硬化性組成物が硬化する際に(メタ)アリル化合物とチオール化合物との間でエンチオール反応が進行し、硬化物の密着性がより向上する傾向にある。また、硬化性組成物がチオール化合物を更に含有することで、硬化物の光学特性がより向上する傾向にある。
なお、チオエーテルオリゴマーの重量平均分子量は、後述する実施例に示すように、ゲルパーミエーションクロマトグラフィー(GPC)を用いて測定される分子量分布から標準ポリスチレンの検量線を使用して換算して求められる。
測定試料0.2gを精秤し、これにクロロホルム20mLを加えて試料溶液とする。デンプン指示薬として可溶性デンプン0.275gを30gの純水に溶解させたものを用いて、純水20mL、イソプロピルアルコール10mL、及びデンプン指示薬1mLを加え、スターラーで撹拌する。ヨウ素溶液を滴下し、クロロホルム層が緑色を呈した点を終点とする。このとき下記式にて与えられる値を、測定試料のチオール当量とする。
チオール当量(g/eq)=測定試料の質量(g)×10000/ヨウ素溶液の滴定量(mL)×ヨウ素溶液のファクター
本実施形態の硬化性組成物は、液状媒体を更に含有していてもよい。液状媒体とは、室温(25℃)において液体の状態の媒体をいう。
本実施形態の硬化性組成物は、重合禁止剤、シランカップリング剤、界面活性剤、密着付与剤、酸化防止剤等のその他の成分を更に含有していてもよい。本実施形態の硬化性組成物は、その他の成分のそれぞれについて、1種類を単独で含有していてもよく、2種類以上を組み合わせて含有していてもよい。
本実施形態の硬化性組成物は、(メタ)アリル化合物、(メタ)アクリル化合物、光重合開始剤、量子ドット蛍光体、及び必要に応じてチオール化合物、液状媒体等のその他の成分を常法により混合することで調製することができる。量子ドット蛍光体は、液状媒体に分散させた状態で混合することが好ましい。
本実施形態の波長変換材は、上述した本実施形態の硬化性組成物の硬化物を有する。本実施形態の波長変換材は、必要に応じて、後述する被覆材等の他の構成材を更に有していてもよい。
フィルム状の硬化物の平均厚みは、例えば、マイクロメータを用いて測定した任意の3箇所の厚みの算術平均値として求められる。
フィルム状の被覆材の平均厚みは、フィルム状の硬化物と同様にして求められる。
また、被覆材の水蒸気透過率は、例えば、5×10-2g/(m2・24h・Pa)以下であることが好ましく、1×10-2g/(m2・24h・Pa)以下であることがより好ましく、5×10-3g/(m2・24h・Pa)以下であることが更に好ましい。被覆材の水蒸気透過率は、水蒸気透過率測定装置(例えば、MOCON社製、AQUATRAN)を用いて、温度40℃かつ相対湿度90%の条件で測定することができる。
本実施形態のバックライトユニットは、上述した本実施形態の波長変換材と、光源とを備える。
本実施形態の画像表示装置は、上述した本実施形態のバックライトユニットを備える。画像表示装置としては特に制限されず、例えば、液晶表示装置が挙げられる。
温度計、撹拌装置、窒素導入管、及び真空配管を備えた反応容器に、ペンタエリスリトールテトラキス(3-メルカプトプロピオネート)(SC有機化学(株)製、PEMP)を174.0g取り、回転速度200回/分で撹拌しながら真空ポンプを用いて反応容器内を減圧し、30分間保持した。その後、あらかじめ55℃~65℃で加温して溶解したトリス(2-アクリロイルオキシエチル)イソシアヌレート(日立化成(株)製、ファンクリルFA-731A)を26.0g配合し、30分間撹拌した。続いて、触媒としてトリエチルアミン0.25gを添加し、2時間にわたって反応させた。赤外分光分析測定によりアクリロイル基の吸収ピークが消失したことを確認して反応を終了し、チオエーテルオリゴマー(重量平均分子量:4600)を得た。
装置:高速GPC装置 HLC-8320GPC(検出器:示差屈折計)(東ソー(株)製、商品名)
使用溶媒:テトラヒドロフラン(THF)
カラム:カラムTSKGEL SuperMultipore HZ-H(東ソー(株)製、商品名)
カラムサイズ:カラム長15cm、カラム内径4.6mm
測定温度:40℃
流量:0.35mL/分
試料濃度:10mg/THF5mL
注入量:20μL
(硬化性組成物の調製)
表1に示す各成分を同表に示す配合量(単位:質量部)で混合することにより、実施例1~5並びに比較例1及び2の硬化性組成物をそれぞれ調製した。表1中の「-」は未配合を意味する。
なお、光重合開始剤としては、2,4,6-トリメチルベンゾイル-フェニル-エトキシ-ホスフィンオキサイド(BASF社製、IRGACURE TPO-L)を用いた。また、量子ドット蛍光体としては、CdSe/ZnS(コア/シェル)分散液(Nanosys社製、Gen2 QD Concentrate)を用いた。
上記で得られた各硬化性組成物を厚み110μmのバリアフィルム(凸版印刷(株)製)(被覆材)上に塗布して塗膜を形成した。この塗膜上に厚み110μmのバリアフィルム(凸版印刷(株)製)(被覆材)を貼り合わせ、紫外線照射装置(アイグラフィックス(株)製)を用いて紫外線を照射(照射量:1000mJ/cm2)することにより、硬化物層の両面に被覆材が配置された波長変換材をそれぞれ得た。
実施例1~5並びに比較例1及び2で得られた硬化性組成物及び波長変換材を用いて、以下の各評価項目を測定及び評価した。結果を表2に示す。
上記で得られた各波長変換材を、幅50mm、長さ50mmの寸法に裁断して評価用サンプルを得た。そして、濁度計(日本電色工業(株)製、NHD-2000)を用いて、JIS K 7136:2000の測定法に準拠して、評価用サンプルの全光線透過率及びヘーズを測定した。なお、評価用サンプルのヘーズは、下記式に従って求めた。
ヘーズ(%)=(Td/Tt)×100
Td:拡散透過率
Tt:全光線透過率
上記で得られた各波長変換材を、幅25mm、長さ100mmの寸法に裁断した後、被引張試験機((株)オリエンテック製、RTC-1210)を用いて、25℃の温度環境下、引張速度300mm/分で片面のバリアフィルムを90度方向に引き剥がし、ピール強度を測定した。
上記で得られた各硬化性組成物を温度25℃かつ相対湿度50%の条件で24時間保存し、下記式に従って硬化性組成物の粘度増加率を測定した。
粘度増加率(%)=(Vb/Va)×100
Va:初期粘度(mPa・s)
Vb:24時間経過後の粘度(mPa・s)
そして、以下の評価基準に従い、硬化性組成物の保存安定性を評価した。
-評価基準-
A:粘度増加率:150%未満
B:粘度増加率:150%以上200%未満
C:粘度増加率:200%以上
上記で得られた波長変換材のバリアフィルムを剥離し、幅5mm、長さ40mmの寸法に裁断して評価用硬化物を得た。そして、広域動的粘弾性測定装置(Rheometric Scientific製、Solid Analyzer RSA-III)を用いて、「引張モード、チャック間距離:25mm、周波数:10Hz、測定温度範囲:-20℃~100℃、昇温速度:5℃/分」の条件で、温度25℃における評価用硬化物の貯蔵弾性率及び損失弾性率を測定し、その比から損失正接(tanδ)を求めた。また、損失正接(tanδ)のピークトップ部分の温度からガラス転移温度(Tg)を求めた。
Claims (11)
- (メタ)アリル化合物、(メタ)アクリル化合物、光重合開始剤、及び量子ドット蛍光体を含有する硬化性組成物。
- チオール化合物を更に含有する請求項1に記載の硬化性組成物。
- 前記(メタ)アクリル化合物が、単官能メタクリレート化合物を含む請求項1又は請求項2に記載の硬化性組成物。
- 前記量子ドット蛍光体が、Cd及びInの少なくとも一方を含む化合物を含む請求項1~請求項3のいずれか1項に記載の硬化性組成物。
- 請求項1~請求項4のいずれか1項に記載の硬化性組成物の硬化物を有する波長変換材。
- 前記硬化物がフィルム状である請求項5に記載の波長変換材。
- 前記硬化物の少なくとも一部を被覆する被覆材を更に有する請求項5又は請求項6に記載の波長変換材。
- 前記被覆材が酸素及び水の少なくとも一方に対するバリア性を有する請求項7に記載の波長変換材。
- 動的粘弾性測定により周波数10Hzかつ温度25℃の条件で測定した前記硬化物の損失正接(tanδ)が0.4~1.5である請求項5~請求項8のいずれか1項に記載の波長変換材。
- 請求項5~請求項9のいずれか1項に記載の波長変換材と、光源とを備えるバックライトユニット。
- 請求項10に記載のバックライトユニットを備える画像表示装置。
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| JP2018124412A (ja) * | 2017-01-31 | 2018-08-09 | 大日本印刷株式会社 | 光波長変換組成物、光波長変換粒子、光波長変換部材、光波長変換シート、バックライト装置、および画像表示装置 |
| JP2023546223A (ja) * | 2020-10-21 | 2023-11-01 | メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | 組成物 |
| US11886079B2 (en) | 2020-06-11 | 2024-01-30 | Fujifilm Corporation | Wavelength conversion member, light emitting device, and liquid crystal display device |
| JP2024506743A (ja) * | 2021-02-19 | 2024-02-14 | メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | 組成物 |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2018056469A1 (ja) | 2019-07-11 |
| CN109791234A (zh) | 2019-05-21 |
| JPWO2018055766A1 (ja) | 2019-07-04 |
| TW201814027A (zh) | 2018-04-16 |
| US20200017762A1 (en) | 2020-01-16 |
| CN108431647A (zh) | 2018-08-21 |
| KR20190060900A (ko) | 2019-06-04 |
| WO2018056469A1 (ja) | 2018-03-29 |
| TW201827561A (zh) | 2018-08-01 |
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