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CN118389002A - Light scattering ink composition, color filter and image display device - Google Patents

Light scattering ink composition, color filter and image display device Download PDF

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Publication number
CN118389002A
CN118389002A CN202310059353.8A CN202310059353A CN118389002A CN 118389002 A CN118389002 A CN 118389002A CN 202310059353 A CN202310059353 A CN 202310059353A CN 118389002 A CN118389002 A CN 118389002A
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China
Prior art keywords
ink composition
light scattering
scattering ink
composition according
light
Prior art date
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Pending
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CN202310059353.8A
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Chinese (zh)
Inventor
王贤正
金亨柱
李宪熙
李光镐
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Dongwoo Fine Chem Co Ltd
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Dongwoo Fine Chem Co Ltd
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Priority claimed from KR1020220113902A external-priority patent/KR20230116651A/en
Application filed by Dongwoo Fine Chem Co Ltd filed Critical Dongwoo Fine Chem Co Ltd
Publication of CN118389002A publication Critical patent/CN118389002A/en
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D11/00Inks
    • C09D11/30Inkjet printing inks
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D11/00Inks
    • C09D11/02Printing inks
    • C09D11/10Printing inks based on artificial resins
    • C09D11/101Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D11/00Inks
    • C09D11/30Inkjet printing inks
    • C09D11/38Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/20Filters

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

The present invention relates to a light scattering ink composition including first scattering particles having an average particle diameter of 150nm to 300nm, second scattering particles having an average particle diameter of 10nm to 90nm, a photopolymerizable compound, and a photopolymerization initiator, a color filter including a light scattering layer manufactured using the light scattering ink composition, and an image display device including the color filter.

Description

Light scattering ink composition, color filter and image display device
Technical Field
The invention relates to a light scattering ink composition, a color filter comprising the same and an image display device.
Background
Recently, as one of methods for realizing a color filter, a pigment dispersion method using a pigment-dispersed photosensitive resin has been applied. However, in the process of transmitting light irradiated from the light source through the color filter, a part of the light is absorbed by the color filter, and there is a problem in that: the light efficiency is lowered, and color reproducibility is also lowered due to the characteristics of the pigment contained in the color filter.
As a solution to solve such a problem, a color filter using quantum dots has been proposed. For example, korean patent publication No. 10-2009-0036373 discloses that the display quality of a display device can be improved by improving the light emitting efficiency by replacing the existing color filter with a light emitting layer made of a quantum dot phosphor.
However, in the case of a color filter including quantum dots, there are the following problems: as the efficiency of quantum dots (particularly, blue quantum dots) decreases, the performance of the color filter may be slightly degraded, and the overall manufacturing cost increases due to the high price of blue quantum dots.
Accordingly, a color filter has been proposed that uses a light source that emits blue light, includes a red pattern layer containing red quantum dot particles and a green pattern layer containing green quantum dot particles, and includes a transparent pattern layer containing no quantum dot particles at a position corresponding to the blue pattern layer, wherein the red quantum dot particles emit red light, the green quantum dot particles emit green light, and the transparent pattern layer transmits blue light as it is to represent blue.
Such a transparent pattern layer includes scattering particles to ensure uniformity of transmitted light. However, when the content of the scattering particles increases, there is a problem in that the transmittance decreases. Alternatively, when the content of the scattering particles is reduced, there is a problem that sufficient scattering (haze) characteristics cannot be obtained.
In addition, if the transparent pattern layer is manufactured by an inkjet method, manufacturing processes, time and costs can be greatly reduced. However, since the conventional ink composition is a solvent type containing a solvent, there is a problem that color is mixed with adjacent pixels and flatness of a coating film after forming the coating film is lowered. Alternatively, in the case of producing a solvent-free ink composition containing no solvent, there is a problem concerning reliability due to uneven variation in particle size distribution upon storage for a long period of time, in addition to deterioration in ejection due to a higher viscosity.
Accordingly, the present invention has been made to solve the above-described problems.
[ Prior Art literature ]
[ Patent literature ]
(Patent document 1) korean patent laid-open No. 10-2009-0036373.
Disclosure of Invention
[ Problem to be solved ]
The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a light scattering ink composition which exhibits excellent sprayability and can produce a light scattering layer excellent in light scattering (haze) characteristics while making it possible to improve the transmittance of a coating film, a light scattering layer produced from the light scattering ink composition, a color filter, and an image display device.
Another object of the present invention is to provide a light scattering ink composition, which has little change in particle size or change in particle size distribution and improved storage stability and sedimentation stability even when stored for a long period of time, a light scattering layer, a color filter, and an image display device prepared from the light scattering ink composition.
However, the problems to be solved by the present application are not limited to the above-described problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.
[ Solution to the problem ]
The present invention provides a light scattering ink composition comprising first scattering particles having an average particle diameter of 150nm to 300nm, second scattering particles having an average particle diameter of 10nm to 90nm, a photopolymerizable compound, and a photopolymerization initiator, wherein the first scattering particles are titanium dioxide (TiO 2).
Further, the present invention provides a color filter comprising a light scattering layer manufactured from the above light scattering ink composition.
The present invention also provides an image display device including the color filter.
[ Effect of the invention ]
The light scattering ink composition of the present invention contains titanium dioxide (TiO 2) having an average particle diameter of 150nm to 300nm as the first scattering particles, and contains the second scattering particles having an average particle diameter of 10nm to 90nm, thereby having an effect of improving light scattering (haze) characteristics of the coating film while improving light transmittance of the coating film.
In addition, the light scattering ink composition exhibits excellent jettability, and thus can effectively manufacture a color filter by an inkjet printing method.
In addition, the light scattering ink composition of the present invention has the following effects: even in the case of long-term storage, the change in particle size or the change in particle size distribution is small and the storage stability and sedimentation stability are greatly improved.
Detailed Description
The present invention provides a light scattering ink composition comprising first scattering particles having an average particle diameter of 150nm to 300nm, second scattering particles having an average particle diameter of 10nm to 90nm, a photopolymerizable compound, and a photopolymerization initiator, wherein the first scattering particles are titanium dioxide (TiO 2).
The light scattering ink composition according to the present invention contains titanium oxide (TiO 2) having an average particle diameter of 150nm to 300nm as the first scattering particles, and contains the second scattering particles having an average particle diameter of 10nm to 90nm, thereby having the following effects: the coating film has improved light transmittance and light scattering (haze) characteristics, and excellent sprayability, and is suitable for inkjet printing.
In addition, the light scattering ink composition of the present invention has the following effects: even in the case of long-term storage, the change in particle size or the change in particle size distribution is small and the storage stability and sedimentation stability are greatly improved.
Specifically, the particle size distribution (SPAN) of the light scattering ink composition of the present invention may be 1.5 or less, preferably 1.3 or less.
Furthermore, the light scattering ink composition of the present invention exhibits very excellent sedimentation stability. Specifically, when the light scattering ink composition of the present invention is left in a stability analyzer (turbo) for 24 hours, the back scattering change rate of the upper part (top) may be-5% to 0%.
In the light scattering ink composition of the present invention, when the light scattering ink composition is left in a stability analyzer for 24 hours, the back scattering change rate of the intermediate portion may be-0.3% to 0.3%. In the present invention, the upper (top) and middle (middle) portions may be recognized by those skilled in the art as being respectively identified as upper (top) and middle (middle) portions in a stability analyzer (turbo) test.
Further, the present invention provides a color filter comprising a light scattering layer manufactured from the above light scattering ink composition.
The present invention also provides an image display device including the color filter.
The constitution of the present invention will be described in detail below.
< Light-scattering ink composition >
The light scattering ink composition of the present invention can improve both transmittance and light scattering (haze) characteristics of a coating film and exhibit excellent jettability, so that a color filter can be effectively manufactured by an inkjet printing method.
The light scattering ink composition is characterized by comprising scattering particles, a photopolymerizable compound and a photopolymerization initiator.
Furthermore, the light scattering ink composition of the present application may be characterized in that it does not contain a solvent.
Scattering particles
In the present invention, the scattering particles are used to increase the overall light efficiency by increasing the path of light emitted from the blue light source.
In the present invention, the scattering particles include first scattering particles having an average particle diameter of 150nm to 300nm and second scattering particles having an average particle diameter of 10nm to 90 nm. More preferably, the average particle diameter of the first scattering particles may be 180nm to 250nm, and the average particle diameter of the second scattering particles may be 15nm to 70nm. Thus, by using 2 kinds of scattering particles having different average particle diameters in combination, the transmittance of the coating film can be improved and the light scattering (haze) characteristics can be improved.
The first scattering particle is characterized in that it is titanium oxide (TiO 2) and serves to improve uniformity of transmitted light by scattering light emitted from a blue light source.
The second scattering particles are characterized in that a conventional inorganic material can be used and include a metal oxide having an average particle diameter of 10nm to 90 nm. When the average particle diameter of the second scattering particles is less than 10nm, there is a problem that the light scattering (haze) characteristics of the coating film are lowered, and when the average particle diameter exceeds 90nm, there is a problem that the transmittance of the coating film cannot be improved.
The metal oxide as the second scattering particles may be an oxide :Li、Be、B、Na、Mg、Al、Si、K、Ca、Sc、V、Cr、Mn、Fe、Ni、Cu、Zn、Ga、Ge、Rb、Sr、Y、Mo、Cs、Ba、La、Hf、W、Tl、Pb、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Ti、Sb、Sn、Zr、Nb、Ce、Ta、In including one metal selected from the group consisting of, but not limited to, the following, and combinations thereof.
Specifically, the second scattering particles may include titanium oxide (TiO 2), silicon oxide (SiO 2), barium oxide (BaO), barium sulfate (BaSO 4), zinc oxide (ZnO), zirconium oxide (ZrO 2), or a combination thereof, and preferably include at least one selected from the group consisting of titanium oxide (TiO 2), zinc oxide (ZnO), silicon oxide (SiO 2), barium sulfate (BaSO 4), and zirconium oxide (ZrO 2) in terms of being capable of improving light scattering (haze) characteristics while being capable of improving transmittance of the coating film.
The weight ratio of the first scattering particles to the second scattering particles may be 30:70 to 70:30, preferably 40:60 to 60:40. When the first scattering particles and the second scattering particles satisfy the above weight ratio range, the transmittance of the coating film can be improved and the light scattering (haze) characteristics can be improved together, so that it is preferable.
The content of the scattering particles may be 1 to 50 wt%, preferably 2 to 40 wt%, more preferably 3 to 25 wt%, relative to the total weight of the solid content of the light scattering ink composition. When the content of the scattering particles satisfies the above-described content range, a light scattering ink composition excellent in transmittance and haze characteristics of the coating film can be provided, and is therefore preferable.
Photopolymerizable compound
In the present invention, the photopolymerizable compound may include a compound represented by the following chemical formula 1.
[ Chemical formula 1]
(In the above chemical formula 1,
R 1 to R 5 are each independently a hydrogen atom, a methyl group or a hydroxyl group;
R 6 is a direct bond or an alkylene group having 1 to 4 carbon atoms;
m is an integer from 1 to 5. )
The compound represented by the above chemical formula 1 may contain at least one selected from the group consisting of: di-methylene diacrylate, tri-methylene diacrylate, tetra-methylene diacrylate, penta-methylene diacrylate, hexa-methylene diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tetrapropylene glycol diacrylate, pentapropylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, pentaethylene glycol diacrylate, dibutylene glycol diacrylate, tetramethylene glycol diacrylate, pentylene glycol diacrylate, dimethacrylate, trimethylene dimethacrylate, tetramethylene dimethacrylate, pentylene dimethacrylate, hexamethylene dimethacrylate, dipropylene glycol dimethacrylate, tripropylene glycol dimethacrylate, tetrapropylene glycol dimethacrylate, pentapropylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, diethylene glycol dimethacrylate, tributylene glycol dimethacrylate, tetramethylene glycol dimethacrylate, pentylene glycol dimethacrylate, acryloxyhydroxypropyl acrylate and glycerol dimethacrylate, but are not limited thereto.
When the photopolymerizable compound contains the compound represented by the above chemical formula 1, it is preferable because a light scattering ink composition having excellent jettability can be provided.
In the present invention, the photopolymerizable compound may include a monofunctional monomer, a difunctional monomer, a polyfunctional monomer, and the like as a photopolymerizable compound that can be polymerized by a photopolymerization initiator described later.
Specific examples of the monofunctional monomer may be given: nonylphenyl carbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexyl carbitol acrylate, 2-hydroxyethyl acrylate, N-vinylpyrrolidone, and the like.
As the substance not containing the compound represented by the above chemical formula 1, specific examples thereof may be given: neopentyl glycol diacrylate, neopentyl glycol dimethacrylate, 3-methylpentanediol diacrylate, 3-methylpentanediol dimethacrylate, bisphenol A ethoxylate dimethacrylate, 1, 9-nonanediol di (meth) acrylate, tricyclodecane dimethanol diacrylate, propylene oxide modified bisphenol A di (meth) acrylate and the like.
Specific examples of the polyfunctional monomer may be given: trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, pentaerythritol pentaacrylate, pentaerythritol pentamethacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethylacrylate, and the like, and compounds represented by the following chemical formula 2 are preferable:
[ chemical formula 2]
(In the above chemical formula 2,
R 11 is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a hydroxyalkyl group having 1 to 6 carbon atoms, a hydroxyl group, or a functional group represented by the following chemical formula 3,
R 12 is a hydrogen atom or a methyl group,
R 13 is an alkylene group having 1 to 20 carbon atoms,
P, q and r are each independently integers from 0 to 5,
T is 0 or 1. )
[ Chemical formula 3]
(In the above-mentioned chemical formula 3,
R 14 is a hydrogen atom or a methyl group,
R 15 is an alkylene group having 1 to 20 carbon atoms, a phenylene group or a cycloalkylene group having 3 to 10 carbon atoms.
L is a direct bond or an alkylene group having 1 to 6 atoms,
N is an integer from 0 to 5. )
The content of the photopolymerizable compound may be 10 to 95% by weight, preferably 10 to 90% by weight, relative to the total weight of the solid content of the above light scattering ink composition. When the content of the photopolymerizable compound is within the above range, a light scattering ink composition excellent in jetting properties can be provided, and thus is preferable.
Photopolymerization initiator
The light scattering ink composition of the present invention comprises a photopolymerization initiator.
The photopolymerization initiator contained in the light-scattering ink composition of the present invention may be any photopolymerization initiator as long as it can polymerize the photopolymerizable compound, and the type thereof is not particularly limited. From the viewpoints of polymerization characteristics, initiation efficiency, price, and the like, the photopolymerization initiator may be selected from at least one of the group consisting of: acetophenone compounds, benzophenone compounds, triazine compounds, bisimidazole compounds, oxime compounds, thioxanthone compounds, phosphine oxide compounds, and the like, and in terms of improving the transmittance of the coating film, phosphine oxide compounds are preferably included.
Examples of acetophenone compounds include: diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropane-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- (4-methylthiophenyl) -2-morpholinoethylene-1-one, 2- (4-methylbenzyl) -2- (dimethylamino) -1- (4-morpholinophenyl) butan-1-one, and the like.
Examples of the benzophenone compound include: benzophenone, o-methylbenzoyl benzoate, 4-phenylbenzophenone, 4-benzoyl-4 ' -methylbenzophenyl sulfide, 3', 4' -tetrakis (t-butylperoxycarbonyl) benzophenone, 2,4, 6-trimethylbenzophenone, and the like.
Examples of the triazine compound include: 2, 4-bis (trichloromethyl) -6- (4-methoxyphenyl) -1,3, 5-triazine, 2, 4-bis (trichloromethyl) -6- (4-methoxynaphthyl) -1,3, 5-triazine, 2, 4-bis (trichloromethyl) -6- [2- (3, 4-dimethoxyphenyl) vinyl ] -1,3, 5-triazine, and the like.
Examples of the bisimidazole compound include: examples of the commercially available products include HABI-107 such as Tronly, inc. and the like, and examples thereof include 2,2' -bis (2-chlorophenyl) -4,4', 5' -tetraphenyl biimidazole, 2' -bis (o-methoxyphenyl) -4,5,4', 5' -tetraphenyl-1, 2' -biimidazole, 2' -bis (2, 3-dichlorophenyl) -4,4', 5' -tetraphenyl-1, 2' -biimidazole, and 2,2' -bis (2, 3-dichlorophenyl) -4,4', 5' -tetraphenyl-1, 2' -biimidazole.
Examples of the oxime compound include o-ethoxycarbonyl-. Alpha. -oxyimino-1-phenylpropan-1-one, and examples of the commercially available product include BASF corporationOXE-01, OXE-02, OXE-03, and the like.
Examples of thioxanthones include: 2-isopropylthioxanthone, 2, 4-diethylthioxanthone, 2, 4-dichlorothioxanthone, 1-chloro-4-propoxythioxanthone, etc.
Examples of the phosphine oxide compound include: 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide, phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide, and the like, and commercially available products include Darocur TPO from BASF and IRGACURE-819.
The content of the photopolymerization initiator contained in the light-scattering ink composition of the present invention may be 0.2 to 15% by weight, preferably 0.5 to 7% by weight, relative to the total weight of the solid content of the above light-scattering ink composition. When the photopolymerization initiator satisfies the above content range, there is an advantage that the strength of a pixel portion formed using the light scattering ink composition and the smoothness of the surface of the pixel portion become good.
Additive agent
In addition, the light scattering ink composition according to the present invention may further contain additives such as scattering particle dispersants, anticoagulants, ultraviolet absorbers, fillers, high molecular compounds, defoamers, surfactants, thermal crosslinking agents, adhesion promoters, antioxidants, and the like, to improve performance within a range that does not impair the effects of the present invention.
The content of the above additive may be 0.001 to 10% by weight, and preferably, the content may be 0.01 to 5% by weight, relative to the total weight of the solid content of the above light scattering ink composition.
< Color Filter and image display device >
The present invention is intended to be within the scope of the present invention as a color filter comprising the above-described light scattering ink composition or a light scattering layer prepared from the composition, and an image display device comprising the color filter.
In the color filter and the image display device of the present invention, all matters related to the above-described light scattering ink composition are applicable, and in addition thereto, known matters related to the color filter and the image display device can be applied without limitation.
Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited by the following examples.
< Example >
Preparation example: preparation of scattering particle Dispersion
45 Parts by weight of scattering particles, 5 parts by weight of DISPRBYK-2001 (manufactured by BYK chemical Co.) as a dispersing agent, and 50 parts by weight of 1, 4-butanediol diacrylate or 1, 6-hexanediol diacrylate as a photopolymerizable compound were mixed and dispersed for 12 hours by a bead mill to prepare a scattering particle dispersion. As the scattering particles, the first scattering particles of table 1 below and the second scattering particles according to tables 1 to 5 were used to prepare scattering particle dispersions A1 to a16.
In tables 1 to 5 below, the particle diameter of the scattering particles is defined as the average diameter of the scattering particles.
[ Table 1]
Scattering particle dispersion A1 A2 A3 A4 A5 A6 A7 A8
TiO 2 particle size (nm) 200 150 300 5 10 50 90 100
[ Table 2]
Scattering particle dispersion A9 A10 A11 A12 A13
Particle size (nm) of ZnO second scattering particles 5 10 50 90 100
[ Table 3]
Scattering particle dispersion A14
SiO 2 second scattering particle size (nm) 50
[ Table 4]
Scattering particle dispersion A15
BaSO 4 second scattering particle size (nm) 50
[ Table 5]
Scattering particle dispersion A16
ZrO 2 second scattering particle size (nm) 50
Examples 1 to 12 and comparative examples 1 to 6: preparation of light scattering ink composition
Light scattering ink compositions (unit: wt%) were prepared by mixing according to the compositions and contents disclosed in the following tables 6 and 7.
[ Table 6]
[ Table 7]
A1 to a16: scattering particle dispersions A1 to A16 according to the above preparation examples
B1:1, 4-butanediol diacrylate (Sigma-Aldrich Co.)
B2:1, 6-hexanediol diacrylate (Sigma-Aldrich Co.)
C:2,4, 6-trimethylbenzoyl diphenylphosphine oxide (Sigma-Aldrich Co.)
Examples
The following physical properties were evaluated by the following manner using the light scattering ink compositions prepared in examples and comparative examples, and the results thereof are shown in table 8 below.
1. Sprayability assessment
The jettability of the light scattering ink compositions prepared in the above examples and comparative examples was evaluated according to the following evaluation criteria using an inkjet droplet analyzer.
< Criterion for evaluation of sprayability >
O: the ink jet nozzle is not blocked, and the ejected ink drop is ejected in a straight line.
X: the ink jet nozzles are clogged or the ink droplets are not ejected in a straight line.
2. Coating film transmittance evaluation
The light scattering ink compositions prepared in the above examples and comparative examples were coated on a 5cm×5cm glass substrate, and then irradiated as an ultraviolet light source with 1000mJ/cm 2 using a 1kW high pressure mercury lamp containing both g, h and i lines, and then heated in a heating oven at 180 ℃ for 30 minutes to prepare a light scattering layer. For the manufactured light scattering layer, the coating film transmittance was evaluated according to the following evaluation criteria using QE-2100 (Otsuka electronics company).
< Transmittance evaluation criterion >
O: the transmittance was 101% or more as compared with comparative example 1.
X: the transmittance was less than 101% as compared with comparative example 1.
3. Film haze evaluation
The light scattering ink compositions prepared in the above examples and comparative examples were coated on a 5cm×5cm glass substrate, and then irradiated as an ultraviolet light source with 1000mJ/cm 2 using a 1kW high pressure mercury lamp containing both g, h and i lines, and then heated in a heating oven at 180 ℃ for 30 minutes to prepare a light scattering layer. For the prepared light scattering layer, the haze of the coating film was evaluated using HM-150 (color technology institute on village (Murakami Color Research Laboratory Co.)) according to the following evaluation criteria.
< Haze evaluation criterion >
O: the haze was 99% or more as compared with comparative example 1.
X: the haze was less than 99% compared to comparative example 1.
4. Particle size change rate and particle size distribution evaluation
The initial average particle size and the average particle size after 30 days of storage at room temperature of the light scattering ink compositions prepared in examples and comparative examples were measured using ELSZ-2000ZS (manufactured by Otsuka corporation), respectively. The average particle size change stability was evaluated according to the following evaluation criteria from the particle size change rate thus calculated, and the results thereof are shown in the following table. Also, for the initial particle size distribution (SPAN), the particle size distribution was evaluated using the following equation 1, and the results thereof are shown in the following table.
< Particle size Change stability evaluation criterion >
O: the particle size change rate is 5% or less.
Delta: the particle size change rate is more than 5% and less than 10%.
X: the particle size change rate is more than 10%.
< Equation 1>
5. Confirm sedimentation stability (Terbiscan)
The sedimentation stability of the light scattering ink compositions prepared in examples and comparative examples was evaluated using TURBISCAN LAB equipment. The rate of change of back scattering (Delta Backs scattering; deltaBS) in the upper (top) and middle (middle) portions after 24 hours of standing at room temperature was confirmed by placing 30g of the light scattering ink in a 40ml vial for Turkiscan, and the results are shown in the following table.
Experimental results
[ Table 8]
Referring to the experimental results in table 8 above, the light scattering ink compositions according to examples 1 to 13, including the first scattering particles, the second scattering particles, and the compound represented by chemical formula 1, exhibited excellent jettability while the transmittance and haze characteristics of the coating film were excellent. Further, in the case of the light scattering ink composition of the example, it can be confirmed that: the particle size change rate was low, 5% or less, and the initial particle size distribution (SPAN) also exhibited a small value of 0.3 or less, so that storage stability was also excellent, and it was confirmed that: the back scattering change rate (Delta Backs scattering; deltaBS) of the upper part (top) and the middle part (middle) after 24 hours of standing at room temperature was small, so that the sedimentation stability was excellent.
In contrast, in the case of comparative example 1 which does not contain the 2 nd scattering particle, it was confirmed that: the transmittance characteristics and the sedimentation stability were significantly reduced, and in the case of comparative example 2 containing no 1 st scattering particles, the haze characteristics and the sedimentation stability were significantly reduced. Further, in the case of comparative examples 3 to 6 containing the second scattering particles having an average particle diameter exceeding the range of 10nm to 90nm, it was confirmed that: the jettability, transmittance and/or haze properties and the shelf stability are significantly reduced.

Claims (15)

1. A light scattering ink composition comprising: first scattering particles having an average particle diameter of 150nm to 300nm, second scattering particles having an average particle diameter of 10nm to 90nm, a photopolymerizable compound, and a photopolymerization initiator, and
The first scattering particles are titanium dioxide (TiO 2).
2. The light scattering ink composition according to claim 1, wherein,
The first scattering particles have an average particle diameter of 180nm to 250nm, and the second scattering particles have an average particle diameter of 15nm to 70nm.
3. The light scattering ink composition according to claim 1, wherein,
Wherein the photopolymerizable compound includes a compound represented by the following chemical formula 1:
[ chemical formula 1]
In the chemical formula 1 described above, a compound having the formula,
R 1 to R 5 are each independently a hydrogen atom, a methyl group or a hydroxyl group,
R 6 is a direct bond or an alkylene group having 1 to 4 carbon atoms,
M is an integer from 1 to 5.
4. The light scattering ink composition according to claim 1, wherein,
The second scattering particles are at least one selected from the group consisting of titanium oxide (TiO 2), zinc oxide (ZnO), silicon oxide (SiO 2), barium oxide (BaO), barium sulfate (BaSO 4), and zirconium oxide (ZrO 2).
5. The light scattering ink composition according to claim 1, wherein,
The weight ratio of the first scattering particles to the second scattering particles is 30:70 to 70:30.
6. The light scattering ink composition according to claim 1, wherein,
The content of the photopolymerizable compound is 10 to 95% by weight with respect to the total weight of the solid content of the light scattering ink composition.
7. The light scattering ink composition according to claim 1, wherein,
The photopolymerization initiator contains a phosphine oxide-based compound.
8. The light scattering ink composition according to claim 1, wherein,
The photopolymerization initiator is contained in an amount of 0.2 to 15% by weight relative to the total weight of the solid content of the light-scattering ink composition.
9. The light scattering ink composition according to claim 1, wherein,
The light scattering ink composition further comprises an additive.
10. The light scattering ink composition according to claim 1, wherein,
The light scattering ink composition does not comprise a solvent.
11. The light scattering ink composition according to any one of claims 1 to 10, wherein,
When the light scattering ink composition is stored at room temperature for 30 days, the average particle size change rate is 5% or less.
12. The light scattering ink composition according to any one of claims 1 to 10, wherein,
The particle size distribution (SPAN) of the light scattering ink composition is 1.5 or less.
13. The light scattering ink composition according to any one of claims 1 to 10, wherein,
When the light scattering ink composition was left in a stability analyzer (turbo) for 24 hours, the top back scattering change rate was-5% to 0%.
14. A color filter comprising a light scattering layer manufactured from the light scattering ink composition according to any one of claims 1 to 10.
15. An image display device comprising the color filter according to claim 14.
CN202310059353.8A 2022-01-28 2023-01-16 Light scattering ink composition, color filter and image display device Pending CN118389002A (en)

Applications Claiming Priority (3)

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KR10-2022-0012845 2022-01-28
KR1020220113902A KR20230116651A (en) 2022-01-28 2022-09-08 A light scattering ink composition, a color filter, and video display using the light scattering composition
KR10-2022-0113902 2022-09-08

Publications (1)

Publication Number Publication Date
CN118389002A true CN118389002A (en) 2024-07-26

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