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WO2012105294A1 - Encre pour jet d'encre de type séchage uv destinée à une plaque de guidage de lumière, et plaque de guidage de lumière mettant en œuvre cette encre - Google Patents

Encre pour jet d'encre de type séchage uv destinée à une plaque de guidage de lumière, et plaque de guidage de lumière mettant en œuvre cette encre Download PDF

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Publication number
WO2012105294A1
WO2012105294A1 PCT/JP2012/050631 JP2012050631W WO2012105294A1 WO 2012105294 A1 WO2012105294 A1 WO 2012105294A1 JP 2012050631 W JP2012050631 W JP 2012050631W WO 2012105294 A1 WO2012105294 A1 WO 2012105294A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
inkjet ink
resin sheet
ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/050631
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English (en)
Japanese (ja)
Inventor
健太郎 百田
将典 坪田
英之 寺澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Chemical Co Ltd
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Sumitomo Chemical Co Ltd
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Filing date
Publication date
Application filed by Sumitomo Chemical Co Ltd filed Critical Sumitomo Chemical Co Ltd
Publication of WO2012105294A1 publication Critical patent/WO2012105294A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • C09D11/32—Inkjet printing inks characterised by colouring agents
    • C09D11/322—Pigment inks
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • 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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to an ultraviolet curable inkjet ink for a light guide plate and a light guide plate using the same.
  • a transmissive image display device such as a liquid crystal display device generally has a surface light source device as a backlight.
  • the edge light type surface light source device includes a light guide plate having a translucent resin sheet and a light source that supplies light to an end surface of the translucent resin sheet. Light incident from the end face of the translucent resin sheet is reflected by reflecting means such as reflective dots provided on the back side of the translucent resin sheet, and planar light for image display is emitted from the exit surface of the light guide plate. Supplied.
  • Patent Document 1 Application of ink jet printing using ink jet ink has been proposed as a method of forming reflective dots (alignment pattern) (Patent Document 1). According to inkjet printing, it is expected that the reflective dots constituting a desired pattern can be easily formed.
  • the natural color tone tends to be impaired, such as a strong yellowishness of light. Became clear. This is considered to be because the emitted light was strongly influenced by the reflective dots.
  • an object of the present invention is to make the light supplied from the surface light source device have a more natural color tone when the reflective dots of the light guide plate used in the surface light source device are formed by ink jet printing.
  • the present invention relates to an ultraviolet curable inkjet ink for a light guide plate, which contains a pigment, polyester (meth) acrylate, a photopolymerizable monomer having a hydroxyl group, and a photopolymerizable initiator.
  • the light supplied from the surface light source device can have a more natural color tone.
  • the content ratio of the photopolymerizable monomer having a hydroxyl group is preferably 40% by mass or less based on the total mass of the inkjet ink.
  • the content ratio of the photopolymerizable monomer having a hydroxyl group exceeds 40% by mass, the color tone improving effect according to the present invention tends to be small.
  • the viscosity of the inkjet ink at 50 ⁇ 10 ° C. is preferably 5.0 to 15.0 mPa ⁇ s, and more preferably 8.0 to 12.0 mPa ⁇ s.
  • the surface tension of the inkjet ink at 25.0 ° C. is preferably 25.0 to 45.0 mJ / m 2 , more preferably 25.0 to 37.0 mJ / m 2 .
  • the cumulative 50% particle diameter D50 of the pigment is preferably 50 to 195 nm. Thereby, sufficient light diffusion and light reflection functions can be secured with a small amount of pigment. From the same viewpoint, the pigment preferably contains titanium dioxide particles.
  • the present invention provides a step of forming the pattern by placing the inkjet ink according to the present invention on the surface of the light-transmitting resin sheet by inkjet printing, and the inkjet ink forming the pattern by ultraviolet rays. And a step of curing to form reflective dots.
  • a light guide plate capable of supplying light with a natural color tone can be obtained. Further, by combining inkjet printing and subsequent UV curing, ink can be used without waste, and higher productivity can be obtained.
  • the present invention relates to a light guide plate including a translucent resin sheet and reflective dots provided on the translucent resin sheet.
  • the light guide plate according to the present invention is a light guide plate that can be obtained by the manufacturing method according to the present invention.
  • the present invention relates to a surface light source device including the light guide plate according to the present invention and a light source that supplies light to an end surface of the light guide plate. Furthermore, the present invention also relates to a transmissive image display device including the surface light source device and a transmissive image display unit disposed to face the emission surface of the surface light source device.
  • the light guide plate and the surface light source device it is possible to supply light of a natural color tone. Further, according to the transmissive image display device of the present invention, a high-quality image based on a surface light source with a natural color tone is displayed while suppressing the manufacturing cost when the screen is enlarged by adopting ink jet printing. be able to.
  • the maximum thickness of the reflective dots is preferably 20 ⁇ m or less, and the yellow index obtained based on the spectral transmittance measurement of light transmitted through the reflective dots and the translucent resin sheet is preferably 10 or less. Thereby, the improvement effect of a color tone becomes still more remarkable.
  • the translucent resin sheet is preferably a polymethyl methacrylate resin sheet.
  • the light supplied from the surface light source device can have a more natural color tone.
  • FIG. 1 is a cross-sectional view showing an embodiment of a transmissive image display device including a surface light source device.
  • the transmissive image display device 100 shown in FIG. 1 is mainly composed of a surface light source device 20 and a transmissive image display unit 30.
  • the surface light source device 20 is an edge light type surface light source device including the light guide plate 1 having the translucent resin sheet 11 and the light source 3 provided along the end surface S3 of the translucent resin sheet 11.
  • the translucent resin sheet 11 has an emission surface S1 and a back surface S2 on the opposite side, and the light guide plate 1 further includes reflective dots 12 provided on the back surface S2 side.
  • the transmissive image display unit 30 is disposed opposite to the light guide plate 1 on the emission surface S1 side of the light guide plate 1.
  • the transmissive image display unit 30 is, for example, a liquid crystal display unit having a liquid crystal cell.
  • the light emitted from the light source 3 enters the translucent resin sheet 11 from the end surface S3.
  • the light that has entered the translucent resin sheet 11 is mainly reflected from the emission surface S ⁇ b> 1 by being irregularly reflected by the reflective dots 12.
  • the light emitted from the emission surface S ⁇ b> 1 is supplied to the transmissive image display unit 30.
  • the pattern of the reflective dots 12 is adjusted so that uniform planar light is efficiently emitted from the emission surface S1. Adjacent reflective dots 12 may be separated from each other or connected.
  • the translucent resin sheet 11 is preferably a poly (meth) acrylic acid alkyl resin sheet, a polystyrene sheet, or a polycarbonate resin sheet, and among these, a polymethyl methacrylate resin sheet (PMMA resin sheet) is preferable.
  • the translucent resin sheet 11 may contain diffusing particles.
  • the surface (exit surface S1) opposite to the surface (rear surface S2) on which the reflective dots 12 of the translucent resin sheet 11 are formed may be a flat surface as in this embodiment, but has an uneven shape. You may have.
  • the thickness of the translucent resin sheet 11 is 1.0 mm or more and 4.5 mm or less.
  • the maximum thickness of the reflective dots 12 is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less.
  • the yellow index obtained based on the spectral transmittance measurement of the light transmitted through the reflective dots 12 and the translucent resin sheet 11 in the direction perpendicular to the emission surface S1 is preferably 10 or less.
  • inkjet ink used to form the reflective dots print the entire surface of the translucent resin sheet, cure the printed ink, and have a reflective film with the same thickness as the reflective dots
  • a sample can be obtained and used to measure the yellow index.
  • a yellow index of 10 or less can be easily achieved by, for example, a combination of a PMMA resin sheet and an inkjet ink described later. Details of the yellow index measurement method will be described in the examples described later.
  • the light source 3 may be a linear light source such as a cold cathode fluorescent lamp (CCFL), but is preferably a point light source such as an LED.
  • CCFL cold cathode fluorescent lamp
  • a plurality of point light sources are arranged along at least one of the four sides constituting the rectangular main surface of the translucent resin sheet 11. It is particularly advantageous to combine a reflective dot formed by an inkjet ink, which will be described later, with an LED in order to obtain light with a natural color tone.
  • FIG. 2 is a perspective view showing an embodiment of a method for manufacturing a light guide plate.
  • the light guide plate manufacturing apparatus 200 shown in FIG. 2 includes a transport means 40 that transports the translucent resin sheet 11, an inkjet head 5, a UV lamp 7, and an inspection apparatus 9.
  • the inkjet head 5, the UV lamp 7, and the inspection device 9 are arranged in this order from the upstream side in the moving direction A of the translucent resin sheet.
  • the translucent resin sheet 11 is conveyed continuously or intermittently along the direction A by the conveying means 40.
  • the translucent resin sheet 11 may be cut in advance according to the size of the light guide plate to be manufactured, or the reflective dots 12 are formed on the long translucent resin sheet 11, and then the translucent resin.
  • the sheet 11 may be cut.
  • the transport unit 40 in the present embodiment is a table shuttle, but the transport unit is not limited to this, and may be, for example, a belt conveyor, a roller, or air floating transfer.
  • a droplet-like inkjet ink is arranged on the surface of the translucent resin sheet 11 by the inkjet head 5 supported by the support portion 41 to form a dot-like pattern.
  • the plurality of dots formed from the printed ink may be separated from each other or connected.
  • the inkjet head 5 is arranged facing the back surface S2 of the translucent resin sheet 11 over the entire width direction (direction perpendicular to A) of the region where the reflective dots are formed on the surface of the translucent resin sheet 11.
  • a plurality of nozzles in a fixed row or two or more rows are provided. Droplet-like ink ejected from the plurality of nozzles by the ink jet method is simultaneously printed all over the entire width direction of the translucent resin sheet 11.
  • the translucent resin sheet 11 is printed with ink while the translucent resin sheet 11 is continuously moved at a constant speed.
  • the translucent resin sheet 11 is printed with ink while the translucent resin sheet 11 is stopped, and the translucent resin sheet 11 is moved to the next printing position and then stopped.
  • the translucent resin sheet 11 can also be efficiently printed with ink in a pattern composed of a plurality of rows of dots.
  • the moving speed of the translucent resin sheet 11 is adjusted so that the translucent resin sheet 11 is appropriately printed with ink.
  • the inkjet head 5 is composed of a plurality of units each having a plurality of nozzles. The plurality of units are arranged so that the ends thereof overlap in the direction A in which the translucent resin sheet 11 is conveyed.
  • the nozzle of the inkjet head 5 is connected to the ink supply unit 50 through a conduit 55.
  • the ink supply unit 50 includes, for example, an ink tank in which ink is stored and a pump for sending out ink.
  • the plurality of conduits 55 may be connected to a single ink tank, or may be connected to a plurality of ink tanks.
  • An inkjet ink used for inkjet printing to form the reflective dots 12 is an ultraviolet curable ink containing a pigment, a polyester (meth) acrylate, a photopolymerizable monomer having a hydroxyl group, and a photopolymerization initiator. It is. “Polyester (meth) acrylate” means polyester acrylate and the corresponding polyester methacrylate.
  • the cumulative 50% particle diameter D50 of the pigment is preferably 50 to 195 nm, more preferably 100 to 190 nm, and even more preferably. 120-180 nm.
  • the pigment preferably contains titanium dioxide particles. Titanium dioxide particles having a cumulative 50% particle diameter D50 in the range of 50 to 195 nm can be obtained from commercially available products by appropriate selection based on the particle size distribution.
  • the content ratio of the pigment in the ink is usually about 0.5 to 15.0% by mass based on the total mass of the ink.
  • the photopolymerizable monomer having a hydroxyl group preferably has a hydroxyl group and one or more vinyl groups.
  • the photopolymerizable monomer having a hydroxyl group includes at least one compound selected from 2-hydroxy-3-phenoxypropyl acrylate and hydroxyethyl acrylate.
  • the content of the photopolymerizable monomer having a hydroxyl group in the ink is preferably 40% by mass or less based on the total mass of the ink. When the content ratio of the photopolymerizable monomer having a hydroxyl group exceeds 40% by mass, the effect of improving the color tone tends to be small.
  • the polyester (meth) acrylate contained in the ink is a photopolymerizable oligomer having a polyester chain formed by a reaction between a diol compound and a dicarboxyl compound, and an acrylate group or a methacrylate group introduced by (meth) acrylic acid or the like. is there.
  • the content of the polyester (meth) acrylate in the ink is preferably 2.0 to 8.0% by mass. When the content ratio of the polyester (meth) acrylate is within this range, the viscosity of the ink can be easily adjusted to a range that can be stably ejected from the inkjet nozzle.
  • the photopolymerization initiator can be appropriately selected from those usually used in the field of ultraviolet curable resins.
  • the content of the photopolymerization initiator in the ink is usually about 0.5 to 10.0% by mass.
  • the inkjet ink may contain components other than the pigment, polyester (meth) acrylate, photopolymerizable monomer having a hydroxyl group, and photopolymerization initiator without departing from the spirit of the present invention.
  • the ink may further contain a photopolymerizable compound other than a photopolymerizable monomer having a polyester (meth) acrylate and a hydroxyl group as a photopolymerizable component.
  • the viscosity of the inkjet ink at 50 ⁇ 10 ° C. is preferably 5.0 to 15.0 mPa ⁇ s, and more preferably 8.0 to 12.0 mPa ⁇ s.
  • the viscosity of the inkjet ink can be adjusted by, for example, the molecular weight and / or content ratio of the polyester (meth) acrylate. As the molecular weight or content ratio of the polyester (meth) acrylate increases, the viscosity of the ink tends to increase.
  • the surface tension of the inkjet ink at 25.0 ° C. is preferably 25.0 to 45.0 mJ / m 2 , more preferably 25.0 to 37.0 mJ / m 2 .
  • the surface tension of the ink-jet ink can be adjusted, for example, by blending a surfactant such as silicon and fluorine into the ink.
  • the printed ink is cured in the region 70 by the UV lamp 7 supported by the support portion 42. Thereby, the reflective dots 12 made of the cured ink are formed.
  • the light guide plate 1 is obtained through a process of inspecting the state of the formed reflective dots 12 by the inspection device 9 supported by the support portion 43.
  • the light guide plate 1 is cut into a desired size as necessary.
  • the light guide plate does not necessarily have to be continuously inspected by the inspection device provided on the downstream side of the inkjet head, and the light guide plate can be inspected offline by a separately prepared inspection device. .
  • the inspection of the light guide plate by the inspection device may be omitted.
  • Example 1 8.0% by mass of titanium dioxide particles (Ishihara Sangyo Co., Ltd., TYPEKE PF-671, rutile type, 97% TiO 2 ratio) as a pigment surface-treated with Al, Si and organic substances, a photopolymerizable oligomer As a polyester acrylate (Aronix M-7300K, manufactured by Toagosei Co., Ltd.) and 2-hydroxy-3-phenoxypropyl acrylate (Toa Gosei Co., Ltd.), a photopolymerizable monomer having a hydroxyl group Manufactured by M5700) and 20.0% by mass of hydroxyethyl acrylate (manufactured by Kyoeisha Chemical Co., Ltd., light acrylate HOA) and isobornyl acrylate (Kyoeisha Chemical Co., Ltd.) as another photopolymerizable monomer.
  • titanium dioxide particles Ishihara Sangyo Co., Ltd., TYPEKE
  • the cumulative 50% particle diameter D50 (volume average particle diameter) of the titanium dioxide particles used as the pigment was measured by a dynamic light scattering method (photon correlation method) using Malvern Zetasizer Nano S manufactured by Spectris Co., Ltd. About 1 g of ink was diluted 100 times with cyclohexanone to prepare a dispersion for measurement. The dispersion was irradiated with ultrasonic waves for 10 minutes using an ultrasonic cleaner or a homogenizer. Next, the dispersion was introduced into a sample inlet of Zetasizer Nano S, and the particle diameter and volume of the pigment were measured.
  • D50 is the particle diameter of the particles when the particle diameter and volume of all the particles are measured, and when the volume is sequentially accumulated from the particles of small particle diameter, the accumulated volume becomes 50% of the total volume of all the particles. is there.
  • the D50 of the pigment was 170 nm.
  • the viscosity of the ink at 40 ° C. was 9.6 mPa ⁇ s, and the surface tension of the ink at 25 ° C. was 28.0 mJ / m 2 .
  • the obtained ink was applied to the entire surface of one side of a PMMA resin sheet of 50 mm square and 4 mm thickness using a bar coater, and the applied ink was cured by ultraviolet irradiation to provide a spectroscope having a reflective film formed from the ink.
  • a small sample for transmittance measurement was obtained.
  • the thickness of the reflective film of the obtained sample was measured using a deck tack (Large Sample Profile FP10, manufactured by Toago Technology Co., Ltd.), it was 0.8 ⁇ m.
  • the irradiation conditions of ultraviolet rays are as follows.
  • UV irradiation condition lamp metal halide lamp (condensing type), 2 outputs: 120 W / cm Irradiation time: 0.5 seconds Irradiation distance: Focal length + 10 mm
  • Comparative Example 1 As photopolymerizable oligomers, aliphatic urethane acrylate (CN981 manufactured by Sartomer Japan Co., Ltd., 2.0 mass%) and 2-hydroxy-3-phenoxypropyl acrylate (Toagosei Co., Ltd.) as a photopolymerizable monomer having a hydroxyl group Co., Ltd., M5700) 45.0% by mass, isobornyl acrylate (Kyoeisha Chemical Co., Ltd., light acrylate IBXA) 28.0% by mass and tridecyl acrylate (Sartomer Japan) as other photopolymerizable monomers SR489 made by Co., Ltd. and 10.0% by mass were used. Other than this was carried out similarly to Example 1, and obtained the ultraviolet curable inkjet ink.
  • aliphatic urethane acrylate CN981 manufactured by Sartomer Japan Co., Ltd., 2.0 mass
  • 2-hydroxy-3-phenoxypropyl acrylate
  • the viscosity of the ink at 40 ° C. was 18.6 mPa ⁇ s, and the surface tension of the ink at 25 ° C. was 27.0 mJ / m 2 .
  • Example 2 Using the obtained ink, a small sample for spectral transmittance measurement having a reflective film formed from the ink was prepared in the same manner as in Example 1. The thickness of the reflective film was 1.21 ⁇ m.
  • Yellow Index (YI) Measurement The spectral transmittance of light transmitted through the small sample for spectral transmittance measurement prepared in Example 1 and Comparative Example 1 was measured using a spectral transmittance meter with an integrating sphere (U-4100 manufactured by Hitachi, Ltd.). And measured in a wavelength range of 300 nm to 800 nm. From the measurement results, the yellow index (YI) was determined.
  • the masking film was peeled off from the 920 mm ⁇ 540 mm PMMA resin sheet, and the ink of Example 1 or Comparative Example 1 was arranged on the exposed surface so that the brightness was uniform in the surface by inkjet printing. Formed.
  • the printed ink was cured by ultraviolet irradiation to form reflective dots, and a light guide plate having reflective dots formed in a dot-like pattern was obtained.
  • the printing conditions and ultraviolet irradiation conditions are as follows.
  • UV irradiation condition lamp metal halide lamp (condensing type), 2 outputs: 120 W / cm Irradiation time: 0.5 seconds Irradiation distance: Focal length + 10 mm
  • Luminance measurement Two diffusion films, one prism film, and a light guide plate were removed from a surface light source device of a commercially available liquid crystal display device, and a frame in which a plurality of LEDs were arranged as a light source was prepared. Inside this frame, the light guide plate prepared in “Preparation of light guide plate” was incorporated, and two diffusion films and one prism film were stacked, and these were fixed to the frame. In this state, the LED was turned on, and the luminance and chromaticity of light from the emission surface were measured using a luminance meter (Eye System, Eye Scale 3W, multipoint luminance meter).
  • a luminance meter Eye System, Eye Scale 3W, multipoint luminance meter
  • In-plane average luminance, in-plane average chromaticity x, and in-plane average chromaticity y were determined from the measurement values at 90 measurement points in the long side direction of the light guide plate and 50 measurement points in the short side direction of the light guide plate.
  • Table 1 shows the results of YI measurement and luminance measurement together with the main ink composition.
  • Example 1 using the ink containing both the polyester acrylate and the photopolymerizable monomer having a hydroxyl group, the values of the in-plane average chromaticity x and y in the display screen are clear as compared with Comparative Example 1. It was confirmed that discoloration of LED light to yellow was sufficiently suppressed. This is considered to be mainly due to the fact that the yellow index of the light transmitted through the reflective dots formed from the ink of Example 1 was greatly reduced as compared with Comparative Example 1.
  • SYMBOLS 1 ... Light guide plate, 3 ... Light source, 5 ... Inkjet head, 7 ... UV lamp, 9 ... Inspection apparatus, 11 ... Translucent resin sheet, 12 ... Reflection dot, 20 ... Surface light source device, 30 ... Transmission type image display part , 40 ... conveying means, 50 ... ink supply unit, 55 ... conduit, 100 ... transmission type image display device (liquid crystal display device), 200 ... light guide plate manufacturing device, S1 ... emitting surface, S2 ... back surface, S3 ... end surface, A: Movement direction of translucent resin sheet.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Planar Illumination Modules (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne une encre pour jet d'encre de type séchage UV destinée à une plaque de guidage de lumière qui comprend : un pigment, un polyester (méth)acrylate, un monomère photopolymérisable possédant un groupe hydroxyle, et un initiateur de photopolymérisation.
PCT/JP2012/050631 2011-01-31 2012-01-13 Encre pour jet d'encre de type séchage uv destinée à une plaque de guidage de lumière, et plaque de guidage de lumière mettant en œuvre cette encre Ceased WO2012105294A1 (fr)

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JP2011018590A JP5710295B2 (ja) 2011-01-31 2011-01-31 導光板用紫外線硬化型インクジェットインク及びこれを用いた導光板
JP2011-018590 2011-01-31

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WO2012105294A1 true WO2012105294A1 (fr) 2012-08-09

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PCT/JP2012/050631 Ceased WO2012105294A1 (fr) 2011-01-31 2012-01-13 Encre pour jet d'encre de type séchage uv destinée à une plaque de guidage de lumière, et plaque de guidage de lumière mettant en œuvre cette encre

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JP (1) JP5710295B2 (fr)
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CN103666104A (zh) * 2013-11-29 2014-03-26 当涂县科辉商贸有限公司 一种紫外光固化数码喷绘油墨及其制备方法
WO2020023602A1 (fr) * 2018-07-24 2020-01-30 Keyland Polymer Material Sciences, Llc Matériau solide de haut poids moléculaire et de migration faible pouvant durcir par rayonnement de lumière visible, rayonnement ultraviolet, ou rayonnement par faisceau d'électrons

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KR102419673B1 (ko) 2019-01-21 2022-07-08 삼성에스디아이 주식회사 양자점, 이를 포함하는 경화성 조성물, 상기 조성물을 이용하여 제조된 경화막, 상기 경화막을 포함하는 컬러필터, 디스플레이 장치 및 상기 경화막의 제조방법
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KR102360987B1 (ko) 2019-04-24 2022-02-08 삼성에스디아이 주식회사 양자점 함유 경화성 조성물, 이를 이용한 수지막 및 디스플레이 장치
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KR102602724B1 (ko) 2019-10-14 2023-11-14 삼성에스디아이 주식회사 양자점, 이를 포함하는 경화성 조성물, 상기 조성물을 이용하여 제조된 경화막 및 상기 경화막을 포함하는 컬러필터
JP7463795B2 (ja) 2020-03-25 2024-04-09 セイコーエプソン株式会社 放射線硬化型インクジェット組成物及びインクジェット方法
JP7435121B2 (ja) 2020-03-25 2024-02-21 セイコーエプソン株式会社 放射線硬化型インクジェット組成物及びインクジェット方法
JP7757762B2 (ja) * 2021-12-14 2025-10-22 セイコーエプソン株式会社 放射線硬化型インクジェット組成物

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103666104A (zh) * 2013-11-29 2014-03-26 当涂县科辉商贸有限公司 一种紫外光固化数码喷绘油墨及其制备方法
WO2020023602A1 (fr) * 2018-07-24 2020-01-30 Keyland Polymer Material Sciences, Llc Matériau solide de haut poids moléculaire et de migration faible pouvant durcir par rayonnement de lumière visible, rayonnement ultraviolet, ou rayonnement par faisceau d'électrons

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