Photopolymerizable composition for ink jet, cured film of composition, and optical member and display device comprising cured film

Abstract

The present invention relates to a photocurable composition which exhibits low refractive properties after curing while controlling a decrease in transmittance and an increase in haze, a cured film comprising a cured product thereof, and an optical member and a display device comprising the cured film.

Description

Technical Field

[0001] The present invention relates to a photopolymerizable composition for inkjet, a cured film of the composition, and an optical component and a display device including the cured film. Background Art

[0002] Demand for improved light efficiency in devices such as organic light-emitting diodes (OLEDs) and image sensors is increasing. Research and development activities related to refractive index-controlled optical films are currently underway as a necessary technology for improving the lifespan of OLEDs and boosting cell efficiency.

[0003] Currently, it is known that the theoretical lower limit of the refractive index range that can be adjusted using organic compounds is approximately 1.40 to 1.46. While the refractive index can be lowered when hollow silica is added, compatibility issues with the organic compound can lead to reduced transmittance, haze, and adhesion between the upper and lower films. Furthermore, the increased viscosity of the composition can lead to problems such as reduced inkjet processability, resulting in numerous technical limitations.

[0004] Due to the numerous problems existing in the conventional technologies as described above, there is a need to develop a technology that can form an optical film exhibiting excellent optical properties while exhibiting low refractive properties while controlling the decrease in transmittance and the increase in haze. Summary of the Invention

[0005] Technical issues

[0006] The present invention provides a photocurable composition capable of forming an optical film exhibiting low refractive properties while controlling the decrease in transmittance and the increase in haze.

[0007] Furthermore, the present invention provides a cured film comprising a cured product of the photocurable composition.

[0008] Furthermore, the present invention provides an optical component including the cured film.

[0009] Furthermore, the present invention provides a display device including the optical component.

[0010] However, the problems to be solved by the present invention are not limited to the problems mentioned in the above contents, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

[0011] Solutions to the Problem

[0012] One embodiment of the present invention provides a photopolymerizable composition for inkjet, comprising: a first highly flexible monomer comprising a photocurable functional group and having a viscosity of 10 cP or more; a second highly flexible monomer comprising a photocurable functional group and having a viscosity of less than 10 cP; a high hardness monomer comprising a photocurable functional group; and one or more photopolymerization initiators.

[0013] In one embodiment of the present invention, the first highly flexible monomer may include a compound represented by the following Chemical Formula 1.

[0014] [Chemical Formula 1]

[0015] A-(B) m1 -X-(B) n1 —A′

[0016] In the chemical formula 1, A and A' are photocurable functional groups, B is a hydrocarbon compound containing one or more oxygen atoms, X is a direct bond or an allotrope of a structure having 3 or more carbon atoms, and m1 and n1 are each independently 0 or an integer from 1 to 2.

[0017] In one embodiment of the present invention, the liquid phase refractive index (nD 25 ) may be 1.47 or less, and the absolute viscosity measured at 25°C may be 10 cP or more and 65 cP or less.

[0018] In one embodiment of the present invention, the first highly flexible monomer may include at least one of neopentyl glycol propoxylate di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and polypropylene glycol 400 di(meth)acrylate.

[0019] In one embodiment of the present invention, based on 100 parts by weight of the monomer mixture including the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer, the content of the first highly flexible monomer may be 50 parts by weight or more and 89 parts by weight or less.

[0020] In one embodiment of the present invention, the liquid phase refractive index (nD 25 ) may be 1.45 or less, and the absolute viscosity measured at 25°C may be less than 10 cP.

[0021] In one embodiment of the present invention, the second highly flexible monomer may include at least one of isodecyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and isostearyl (meth)acrylate.

[0022] In one embodiment of the present invention, based on 100 parts by weight of the monomer mixture including the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer, the content of the second highly flexible monomer may be 1 part by weight or more and 20 parts by weight or less.

[0023] In one embodiment of the present invention, the high hardness monomer may include a compound represented by the following Chemical Formula 2.

[0024] [Chemical Formula 2]

[0025] (A) m2 -Y-(A′) n2

[0026] In Chemical Formula 2, A and A' are photocurable functional groups and are the same or different from each other, Y is an aliphatic structure having 4 to 50 carbon atoms and including or not including one or more oxygen atoms, and includes a linear alkyl structure having at least 4 carbon atoms, and m2 and n2 are each independently an integer of 0 or 1.

[0027] In one embodiment of the present invention, the liquid phase refractive index (nD 25 ) can be less than 1.49.

[0028] In one embodiment of the present invention, the high hardness monomer may include at least one of 1,6-hexanediol di(meth)acrylate, hydroxypivalate neopentyl glycol di(meth)acrylate, and vinyloxyethoxyethyl (meth)acrylate.

[0029] In one embodiment of the present invention, based on 100 parts by weight of the monomer mixture including the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer, the content of the high hardness monomer may be greater than 10 parts by weight and less than 49 parts by weight.

[0030] In one embodiment of the present invention, the content of the photoinitiator may be 5 parts by weight or more and 20 parts by weight or less relative to 100 parts by weight of the monomer mixture including the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer.

[0031] In one embodiment of the present invention, the purity of the first highly flexible monomer, the second highly flexible monomer, the high hardness monomer, and the photopolymerization initiator measured by gas chromatography may be 95% or higher.

[0032] In one embodiment of the present invention, the viscosity of the inkjet photopolymerizable composition may be 5 cP or more and 30 cP or less.

[0033] One embodiment of the present invention provides a cured film, comprising a cured product of an inkjet photopolymerizable composition, the inkjet photopolymerizable composition comprising: a first highly flexible monomer containing a photocurable functional group and having a viscosity of 10 cP or greater; a second highly flexible monomer containing a photocurable functional group and having a viscosity of less than 10 cP; a high hardness monomer containing a photocurable functional group; and one or more photopolymerization initiators; the cured film having a haze of 0.5 or less after being stored at 85°C / 85% RH for 500 hours. The haze is defined as the degree of diffusion compared to the incident angle of light incident on a transparent film when the haze value of the cured film is measured using a spectrophotometer after the cured film has been stored at a constant temperature and humidity at 85°C for 500 hours, and is calculated using the following formula 1.

[0034] [Formula 1]

[0035]

[0036] In the above formula 1, Ir is the transmittance of light transmitted when the incident angle is less than 2.5°, and Is is the transmittance of light transmitted when the incident angle is 2.5° or more.

[0037] In one embodiment of the present invention, the refractive index of the cured film may be 1.50 or less.

[0038] In one embodiment of the present invention, the modulus of the cured film may be greater than 1 GPa.

[0039] In one embodiment of the present invention, the elongation of the cured film may be 5% or more.

[0040] In one embodiment of the present invention, when a polarizing plate is attached to the cured film and left at 65° C. / 90% RH for 500 hours, the change in the reflected color coordinate a* of the polarizing plate may be ±0.5 or less.

[0041] One embodiment of the present invention provides an optical component including the cured film.

[0042] One embodiment of the present invention provides a display device including the cured film as at least one of an optical film and a pattern film.

[0043] Effects of the Invention

[0044] The photopolymerizable composition for inkjet according to one embodiment of the present invention can exhibit low refractive properties, high transmittance properties, and low haze properties.

[0045] The cured film according to one embodiment of the present invention can exhibit low refractive properties, high transmittance properties, and low haze properties.

[0046] The optical component according to one embodiment of the present invention can achieve excellent optical properties by including the cured film.

[0047] The display device according to one embodiment of the present invention can exhibit excellent optical characteristics.

[0048] The effects of the present invention are not limited to the effects described above, and relevant practitioners will be able to clearly understand other effects not mentioned through this specification and the accompanying drawings. DETAILED DESCRIPTION

[0049] In this specification, when a part is described as “including” a certain component, unless otherwise clearly described, it does not mean that other components are excluded, but rather that other components may be included.

[0050] In this specification, when it is described that a certain component is located “on” another component, it includes not only a case where the certain component is not in contact with the other component, but also a case where there is another component between the two components.

[0051] In the present specification, the unit "parts by weight" may indicate a weight ratio of each component.

[0052] In this specification, terms containing ordinal numbers, such as "first" and "second," are used solely to distinguish one component from other components and are not limited to the ordinal numbers. For example, within the scope of the claimed invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0053] In this specification, "(meth)acrylate" is used as a general term for acrylate and methacrylate.

[0054] In this specification, the viscosity of a compound may be a value measured at a temperature of 25° C. using a Brookfield viscometer.

[0055] Next, this manual will be described in more detail.

[0056] One embodiment of the present invention provides a photopolymerizable composition for inkjet, comprising: a first highly flexible monomer containing a photocurable functional group and having a viscosity of 10 cP or more; a second highly flexible monomer containing a photocurable functional group and having a viscosity of less than 10 cP; a high hardness monomer containing a photocurable functional group; and one or more photopolymerization initiators.

[0057] According to one embodiment of the present invention, a photopolymerizable composition for inkjet printing can exhibit low refractive index (RRI) properties while also exhibiting high transmittance and low haze. Specifically, the photopolymerizable composition comprises a first highly flexible monomer and a second highly flexible monomer having viscosities within a specific range, thereby easily achieving low refractive index, high transmittance, and low haze properties after curing. Furthermore, the photopolymerizable composition can exhibit excellent inkjet properties. Furthermore, the photopolymerizable composition exhibits excellent modulus and elongation after curing, thereby improving mechanical properties and effectively suppressing discoloration under high temperature and high humidity conditions.

[0058] In one embodiment of the present invention, the first highly flexible monomer may include a compound represented by the following Chemical Formula 1.

[0059] [Chemical Formula 1]

[0060] A-(B) m1 -X-(B) n1 —A′

[0061] In the chemical formula 1, A and A' are photocurable functional groups, B is a hydrocarbon containing one or more oxygens, X is an allotrope of a structure in which the number of carbon atoms is directly bonded or is greater than 3, and m1 and n1 are each independently 0 or an integer from 1 to 2. At this time, in the chemical formula 1, A and A' are photocurable functional groups, which may be (meth)acrylate groups. Specifically, A and A' may be acrylate groups. In the case where A and A' are acrylate groups, a photopolymerizable composition can be provided that can achieve low refractive index, high transmittance, and low haze characteristics after curing. In addition, the photopolymerizable composition can exhibit excellent inkjet properties, and its mechanical properties can be improved by suppressing the decrease in modulus and elongation after curing.

[0062] In the Chemical Formula 1, B may be a linear or branched alkyleneoxy group having 3 to 5 carbon atoms. In the Chemical Formula 1, X may be a directly bonded or linear or branched alkylene group having 1 to 5 carbon atoms.

[0063] By using the first highly flexible monomer comprising the compound represented by Chemical Formula 1, the photopolymerizable composition can more easily achieve low refractive index, high transmittance, and low haze properties after photocuring. Consequently, the photopolymerizable composition can effectively provide a cured film with excellent optical properties. Furthermore, the photopolymerizable composition exhibits excellent modulus and elongation after curing, thereby improving mechanical properties and effectively suppressing discoloration under high temperature and high humidity conditions.

[0064] In one embodiment of the present invention, the first highly flexible monomer may include a compound represented by the following Chemical Formula 1-1.

[0065] [Chemical Formula 1-1]

[0066]

[0067] In the chemical formula 1-1, R1 and R'1 are each independently hydrogen or methyl, R2 and R'2 are each independently a linear or branched alkyleneoxy group having 3 to 5 carbon atoms, R3 is directly bonded or a linear or branched alkylene group having 1 to 5 carbon atoms, m1 and n1 are each independently 0 or an integer from 1 to 2, and p is an integer of 0 or 1. Specifically, R1 and R'1 may be hydrogen. It may be a linear or branched alkyleneoxy group having 3 to 4 carbon atoms, or a linear or branched alkyleneoxy group having 3 carbon atoms.

[0068] By using the first highly flexible monomer comprising the compound represented by Chemical Formula 1-1, the photopolymerizable composition can more easily achieve low refractive index, high transmittance, and low haze properties after photocuring. Consequently, the photopolymerizable composition can effectively provide a cured film with excellent optical properties. Furthermore, the photopolymerizable composition can have properties that facilitate its application in inkjet printing, and its mechanical properties can be improved by suppressing the decrease in modulus and elongation after curing.

[0069] In one embodiment of the present invention, the liquid phase refractive index (nD 25 ) may be 1.47 or less, and the absolute viscosity measured at 25°C may be 10 cP or more and 65 cP or less. Specifically, the liquid phase refractive index (nD 25 ) can be 1.44 or greater. A cured product of the photopolymerizable composition containing the first highly flexible monomer having a liquid phase refractive index and absolute viscosity within the aforementioned ranges can achieve excellent low refractive index, high transmittance, and low haze properties. Furthermore, the photopolymerizable composition can exhibit excellent inkjet properties.

[0070] In one embodiment of the present invention, the first highly flexible monomer may include at least one of neopentyl glycol propoxylate di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and polypropylene glycol 400 di(meth)acrylate. Specifically, the first highly flexible monomer may include at least one of neopentyl glycol propoxylate diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, and polypropylene glycol 400 diacrylate. When the above-described acrylate compound is used as the first highly flexible monomer, the photopolymerizable composition can produce a cured film having a lower haze value, low refractive index, and high transmittance. Furthermore, the photopolymerizable composition can exhibit excellent inkjet properties and, after curing, have excellent modulus and elongation, thereby improving its mechanical properties.

[0071] In one embodiment of the present invention, based on 100 parts by weight of the monomer mixture comprising the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer, the content of the first highly flexible monomer may be 50 parts by weight or more and 89 parts by weight or less. Specifically, based on 100 parts by weight of the monomer mixture, the content of the first highly flexible monomer may be 59 parts by weight or more and 80 parts by weight or less, 60 parts by weight or more and 79 parts by weight or less, 69 parts by weight or more and 70 parts by weight or less, 50 parts by weight or more and 80 parts by weight or less, 50 parts by weight or more and 79 parts by weight or less, 50 parts by weight or more and 70 parts by weight or less, 50 parts by weight or more and 69 parts by weight or less, 50 parts by weight or more and 60 parts by weight or less, 59 parts by weight or more and 89 parts by weight or less, 59 parts by weight or more and 80 parts by weight or less, 59 parts by weight or more and 79 parts by weight or less, 59 parts by weight or more and 70 parts by weight or less, 59 parts by weight or more and 89 parts by weight or less. Parts by weight or less, 59 parts by weight or less and 60 parts by weight or less, 60 parts by weight or less and 89 parts by weight or less, 60 parts by weight or less and 80 parts by weight or less, 60 parts by weight or less and 79 parts by weight or less, 60 parts by weight or less and 70 parts by weight or less, 60 parts by weight or less and 69 parts by weight or less, 69 parts by weight or less and 89 parts by weight or less, 69 parts by weight or less and 80 parts by weight or less, 69 parts by weight or less and 79 parts by weight or less, 70 parts by weight or less and 89 parts by weight or less, 70 parts by weight or less and 80 parts by weight or less, 70 parts by weight or less and 79 parts by weight or less, 79 parts by weight or less and 89 parts by weight or less, or 79 parts by weight or less and 80 parts by weight or less.

[0072] By adjusting the content of the first highly flexible monomer in the monomer mixture to the above range, the photopolymerizable composition can produce a cured film having a lower haze value, low refractive index, and high transmittance. Furthermore, the photopolymerizable composition can have physical properties suitable for inkjet printing, and the modulus and elongation of the cured product of the photopolymerizable composition can be increased, thereby improving its mechanical properties.

[0073] In one embodiment of the present invention, the second highly flexible monomer may include a (meth)acrylate containing a linear or branched alkyl group with a carbon number of 10 to 20. Specifically, the carbon number of the alkyl group contained in the (meth)acrylate containing an alkyl group may be 10 to 18, 10 to 12, 12 to 20, 12 to 18, or 18 to 20. When the (meth)acrylate containing an alkyl group is used as the second highly flexible monomer, the photopolymerizable composition can more easily achieve low refractive index, high transmittance, and low haze characteristics after photocuring. In addition, the photopolymerizable composition can have physical properties that are conveniently suitable for inkjet printing, and can also effectively suppress the discoloration of the cured product of the photopolymerizable composition under high temperature and high humidity conditions.

[0074] In one embodiment of the present invention, the liquid phase refractive index (nD 25 ) may be 1.45 or less, and the absolute viscosity measured at 25°C may be less than 10 cP. Specifically, the liquid phase refractive index (nD 25 ) can be 1.43 or greater. Furthermore, the viscosity of the second highly flexible monomer can be 2 cP or greater. A cured product of the photopolymerizable composition comprising the first highly flexible monomer having a liquid phase refractive index and absolute viscosity within the aforementioned ranges can achieve excellent low refractive index, high transmittance, and low haze properties. Furthermore, the photopolymerizable composition can exhibit excellent inkjet properties.

[0075] In one embodiment of the present invention, the second highly flexible monomer may include at least one of isodecyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and isostearyl (meth)acrylate. Specifically, the second highly flexible monomer may include at least one of isodecyl acrylate, lauryl acrylate, stearyl acrylate, and isostearyl acrylate. When such an acrylate compound is used as the second highly flexible monomer, the photopolymerizable composition can produce a cured film having a lower haze value, low refractive index, and high transmittance.

[0076] In one embodiment of the present invention, based on 100 parts by weight of the monomer mixture containing the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer, the content of the second highly flexible monomer can be greater than 1 part by weight and less than 20 parts by weight. Specifically, based on 100 parts by weight of the monomer mixture, the content of the second highly flexible monomer can be greater than 1 part by weight and less than 10 parts by weight or greater than 10 parts by weight and less than 20 parts by weight. When the content of the second highly flexible monomer contained in the monomer mixture is within the above range, the cured product of the photopolymerizable composition can achieve excellent low refractive index, high transmittance, and low haze properties. The modulus and elongation of the cured product of the photopolymerizable composition are increased, thereby improving mechanical properties and effectively suppressing discoloration under high temperature and high humidity conditions.

[0077] In one embodiment of the present invention, the high hardness monomer may include a compound represented by the following Chemical Formula 2.

[0078] [Chemical Formula 2]

[0079] (A) m2 -Y-(A′) n2

[0080] In the chemical formula 2, A and A' are photocurable functional groups and are the same or different from each other, Y is an aliphatic structure with 4 to 50 carbon atoms, which may or may not contain one or more oxygen atoms, and contains a linear alkyl structure with at least 4 carbon atoms, and m2 and n2 are each independently an integer of 0 or 1. At this time, in the chemical formula 2, A and A' are photocurable functional groups, which may be (meth)acrylate groups. Specifically, A and A' may be acrylate groups. When A and A' are acrylate groups, a photopolymerizable composition can be provided that can achieve low refractive properties, high transmittance properties, and low haze properties after curing. In the chemical formula 2, Y may be a linear or branched alkylene group with 4 to 50 carbon atoms, a linear or branched alkylene group with 4 to 50 carbon atoms containing a carbonyl group in the chain, or a hydrocarbon compound with 4 to 50 carbon atoms containing one or more oxygen atoms in the chain and containing or not containing an unsaturated bond.

[0081] By using the high-hardness monomer comprising the compound represented by Chemical Formula 2, the photopolymerizable composition can more easily achieve low refractive index, high transmittance, and low haze properties after photocuring. Consequently, the photopolymerizable composition can effectively provide a cured film with excellent optical properties. Furthermore, the photopolymerizable composition can have properties that facilitate inkjet printing and can exhibit excellent modulus and elongation after curing, thereby improving its mechanical properties.

[0082] In one embodiment of the present invention, the high hardness monomer may include at least one of a compound represented by the following Chemical Formula 2-1 and a compound represented by the following Chemical Formula 2-2.

[0083] [Chemical Formula 2-1]

[0084]

[0085] In the chemical formula 2-1, R 21 and R' 21 can be independently hydrogen or methyl, R 22 It can be a linear or branched alkylene group having 4 to 50 carbon atoms or -R 23 -R 24 -R' 23 -. R 23 and R' 23 R 24 It can be a carbonyl group (-CO2-). Specifically, R 21 and R' 21 R may be hydrogen. 22 It may be a linear or branched alkylene group having 4 to 40 carbon atoms, a linear or branched alkylene group having 4 to 30 carbon atoms, a linear or branched alkylene group having 4 to 20 carbon atoms, a linear or branched alkylene group having 4 to 10 carbon atoms, or a linear or branched alkylene group having 4 to 6 carbon atoms. 23 and R' 23 Each of them may independently be a linear or branched alkylene group having 2 to 20 carbon atoms, a linear or branched alkylene group having 2 to 15 carbon atoms, a linear or branched alkylene group having 2 to 10 carbon atoms, or a linear or branched alkylene group having 2 to 5 carbon atoms.

[0086] [Chemical Formula 2-2]

[0087]

[0088] In the chemical formula 2-2, R 25 is hydrogen or methyl, R 26 is a linear or branched alkyleneoxy group having 1 to 3 carbon atoms, and q is an integer from 1 to 3. Specifically, R 25 R may be hydrogen. 26 It may be a linear or branched alkyleneoxy group having 1 to 2 carbon atoms or a linear or branched alkyleneoxy group having 2 to 3 carbon atoms. q may be an integer of 1 to 2 or an integer of 2 to 3.

[0089] By using the high-hardness monomer comprising at least one of the compound represented by Chemical Formula 2-1 and the compound represented by Chemical Formula 2-2, the photopolymerizable composition can more easily achieve low refractive index, high transmittance, and low haze properties after photocuring. Consequently, the photopolymerizable composition can effectively provide a cured film having excellent optical properties.

[0090] In one embodiment of the present invention, the liquid phase refractive index (nD 25 ) can be 1.49 or less. Specifically, the liquid phase refractive index of the high-hardness monomer can be 1.44 or greater. The cured product of the photopolymerizable composition containing the high-hardness monomer having a liquid phase refractive index within the above range can achieve excellent low refractive index properties, high transmittance properties, and low haze properties.

[0091] In one embodiment of the present invention, the high hardness monomer may include at least one of 1,6-hexanediol di(meth)acrylate, hydroxypivalic acid neopentyl glycol di(meth)acrylate and vinyloxyethoxyethyl (meth)acrylate. Specifically, the high hardness monomer may include at least one of 1,6-hexanediol diacrylate, hydroxypivalic acid neopentyl glycol diacrylate and vinyloxyethoxyethyl acrylate. When the acrylate compound of the type described above is used as the high hardness monomer, the photopolymerizable composition can produce a cured film having a lower haze value, low refractive properties and high transmittance. In addition, the photopolymerizable composition can have physical properties that are conveniently suitable for inkjet printing, and can improve the modulus and elongation of the cured product of the photopolymerizable composition and thereby improve its mechanical properties.

[0092] In one embodiment of the present invention, based on 100 parts by weight of the monomer mixture comprising the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer, the content of the high hardness monomer may be 10 parts by weight or more and 49 parts by weight or less. Specifically, based on 100 parts by weight of the monomer mixture, the content of the high hardness monomer may be 10 parts by weight or more and 40 parts by weight or less, 10 parts by weight or more and 30 parts by weight or less, 10 parts by weight or more and 2 parts by weight or less, 20 parts by weight or more and 49 parts by weight or less, 20 parts by weight or more and 40 parts by weight or less, 20 parts by weight or more and 30 parts by weight or less, 30 parts by weight or more and 49 parts by weight or less, 20 parts by weight or more and 40 parts by weight or less, or 40 parts by weight or more and 49 parts by weight or less.

[0093] By adjusting the content of the high-hardness monomer in the monomer mixture to the above range, the photopolymerizable composition can achieve a cured film having a lower haze value, low refractive index, and high transmittance. The cured product of the photopolymerizable composition has increased modulus and elongation, thereby improving mechanical properties and effectively suppressing discoloration under high temperature and high humidity conditions.

[0094] In one embodiment of the present invention, the photopolymerization initiator may include at least one of a phosphine oxide compound, an acetophenone compound, an acylphosphine oxide compound, (E)-2-(acetoxyimino)-1-(9,9-diethyl-9H-fluoren-2-yl)butanone, [1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazole-3-yl]-1-(O-acetoxime), an oxime compound, and an oxime ester compound. Specifically, the photopolymerization initiator may include at least a phosphine oxide compound. When using the above-mentioned types of photopolymerization initiators, stable photocuring of the photopolymerizable composition can be induced, thereby improving the optical properties of the cured product of the photopolymerizable composition. As the photopolymerization initiator, phosphine oxide compounds such as Irgacure 819, acetophenone compounds such as Irgacure 369 and Irgacure 907, acylphosphine oxide compounds such as Darocure TPO, oxime compounds such as OXE-01, and oxime ester compounds such as OXE-04 can be used.

[0095] In one embodiment of the present invention, the content of the photopolymerization initiator can be 5 parts by weight to 15 parts by weight, 5 parts by weight to 10 parts by weight, 10 parts by weight to 20 parts by weight, 10 parts by weight to 15 parts by weight, or 15 parts by weight to 20 parts by weight, relative to 100 parts by weight of the monomer mixture comprising the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer. By adjusting the content of the photopolymerization initiator to the above range, the polymerization reaction of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer contained in the photopolymerizable composition can be carried out efficiently and stably.

[0096] In one embodiment of the present invention, the photopolymerization initiator may include more than one photopolymerization initiator. Specifically, the photopolymerization initiator may include a first photopolymerization initiator and a second photopolymerization initiator. The photopolymerization initiator may include a phosphine oxide compound. In addition, the second photopolymerization initiator may include at least one of an acetophenone compound, an acylphosphine oxide compound, (E)-2-(acetoxyimino)-1-(9,9-diethyl-9H-fluorene-2-yl)butanone, [1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazole-3-yl]-1-(O-acetoxime), an oxime compound, and an oxime ester compound. At this time, the weight ratio of the first photopolymerization initiator and the second photopolymerization initiator may be 6:4 to 8:2. By mixing the first photopolymerization initiator and the second photopolymerization initiator, stable photocuring of the photopolymerizable composition can be induced.

[0097] In one embodiment of the present invention, the purity of the first highly flexible monomer, the second highly flexible monomer, the high hardness monomer, and the photopolymerization initiator can be 95% or greater as measured by gas chromatography. By using the first highly flexible monomer, the second highly flexible monomer, the high hardness monomer, and the photopolymerization initiator with a purity of 95% or greater, the photopolymerizable composition can provide a cured film with excellent optical properties.

[0098] In one embodiment of the present invention, the viscosity of the inkjet photopolymerizable composition may be 5 cP or more and 30 cP or less. The viscosity of the photopolymerizable composition may be measured at 25° C. The photopolymerizable composition having a viscosity within the above range can be conveniently used in inkjet printing.

[0099] One embodiment of the present invention provides a cured film, comprising a cured product of an inkjet photopolymerizable composition, the inkjet photopolymerizable composition comprising: a first highly flexible monomer containing a photocurable functional group and having a viscosity of 10 cP or greater; a second highly flexible monomer containing a photocurable functional group and having a viscosity of less than 10 cP; a high hardness monomer containing a photocurable functional group; and one or more photopolymerization initiators; the cured film having a haze of 0.5 or less after being stored at 85°C / 85% RH for 500 hours. The haze is defined as the degree of diffusion compared to the incident angle of light incident on a transparent film when the haze value of the cured film is measured using a spectrophotometer after the cured film has been stored at a constant temperature and humidity at 85°C for 500 hours, and is calculated using the following formula 1.

[0100] [Formula 1]

[0101]

[0102] In Formula 1, Ir is the transmittance of light transmitted when the incident angle is less than 2.5°, and Is is the transmittance of light transmitted when the incident angle is greater than 2.5°. In this case, Ir can represent parallel transmittance, and Is can represent diffuse transmittance.

[0103] The cured film according to one embodiment of the present invention can exhibit low refractive index, high transmittance, and low haze. Furthermore, the film exhibits excellent mechanical properties due to increased modulus and elongation, and effectively suppresses discoloration under high temperature and high humidity conditions.

[0104] The cured film according to one embodiment of the present invention may include a cured product of the photopolymerizable composition according to the embodiment described above. Therefore, the first highly flexible monomer, the second highly flexible monomer, the high hardness monomer, and the photopolymerization initiator in the cured film according to this embodiment may be the same as the first highly flexible monomer, the second highly flexible monomer, the high hardness monomer, and the photopolymerization initiator in the photopolymerizable composition according to the embodiment described above.

[0105] In one embodiment of the present invention, the refractive index of the cured film may be 1.50 or less. Specifically, the refractive index of the cured film measured at a wavelength of 555 to 575 nm (on average) may be 1.50 or less. Furthermore, the refractive index of the cured film may be 1.485 or greater. The cured film exhibits low refractive index characteristics of 1.5 or less, thereby enabling the realization of optical components and display devices with excellent optical properties.

[0106] In one embodiment of the present invention, the modulus of the cured film may be greater than 1 GPa. Alternatively, the modulus of the cured film may be less than 1.2 GPa. A cured film having a modulus value within the above range has excellent mechanical properties and can be easily applied to a display device.

[0107] In one embodiment of the present invention, the elongation of the cured film may be 5% or greater. Alternatively, the elongation of the cured film may be 8% or less. Cured films having elongation values ​​within the above ranges exhibit excellent mechanical properties and are therefore readily suitable for use in display devices.

[0108] In one embodiment of the present invention, when a polarizing plate is attached to the cured film and left at 65°C / 90% RH for 500 hours, the change in the reflected color coordinate a* of the polarizing plate can be ±0.5 or less. This means that the cured film exhibits excellent color change stability even under high temperature and high humidity conditions.

[0109] One embodiment of the present invention provides an optical component including the cured film.

[0110] The optical component according to one embodiment of the present invention can achieve excellent optical properties by including the cured film. In addition, the optical component can effectively suppress discoloration under high temperature and high humidity conditions, thereby ensuring excellent stability.

[0111] In one embodiment of the present invention, the optical component may include: a substrate; and the cured film disposed on the substrate. Furthermore, the cured film may be formed by applying the photopolymerizable composition to the substrate using an inkjet process and then photocuring the composition. In this case, the substrate may be a well-known substrate such as raw glass.

[0112] Furthermore, the optical component can be manufactured by applying the photopolymerizable composition onto the substrate using, for example, a Mayer bar, a coater, or an inkjet device, and then exposing the composition to light, such as with a light-emitting diode (LED) lamp or a metal halide lamp, in an air environment, for example, to light curing. In this case, the photopolymerizable composition can be applied as a single film and then light-cured to form an optical component in the form of a general optical film, or it can be applied into a specific pattern using the inkjet device and then light-cured as needed. In this case, the optical component can be in the form of a patterned film having a cured film patterned into a polyhedron such as a prism structure formed on the substrate.

[0113] One embodiment of the present invention provides a display device including the cured film as at least one of an optical film and a pattern film.

[0114] The display device according to one embodiment of the present invention can exhibit excellent optical characteristics.

[0115] The optical components such as the optical film or pattern film may have a general thickness according to their type or the structure of the display element to which they are applied, for example, the thickness may be adjusted within the range of 0.01 μm to 1000 μm.

[0116] Regarding the structure of the display device using optical components such as the optical film or pattern film, in addition to applying the cured film on the optical component as described above, a general structure known in the art can be adopted, so the specific description thereof will be omitted.

[0117] Next, the present invention will be described in detail with reference to examples. However, the examples of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited by the examples described below. The examples in this specification are intended only to more fully illustrate the present invention to those skilled in the art.

[0118] The first highly flexible monomer

[0119] The following compound was prepared as the first highly flexible monomer.

[0120] [Table 1]

[0121]

[0122] The second most flexible monomer

[0123] The following compound was prepared as the second highly flexible monomer.

[0124] [Table 2]

[0125]

[0126] High hardness monomer

[0127] The following compounds were prepared as high hardness monomers.

[0128] [Table 3]

[0129]

[0130] Photoinitiator

[0131] The following compounds were prepared as photoinitiators.

[0132] [Table 4]

[0133] Scam Types of photoinitiators 1 Irgacure 819 2 Irgacure 369 3 Irgacure 907 4 Darocure TPO 5 (E)-2-(Acetoxyimino)-1-(9,9-diethyl-9H-fluoren-2-yl)butanone 6 [1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazol-3-yl]-1-(O-acetyl oxime) 7 OXE-01 8 OXE-04

[0134] Example

[0135] Example 1

[0136] Production of photocurable compositions

[0137] Neopentyl glycol propoxylate diacrylate was prepared as the first highly flexible monomer, isodecyl acrylate was prepared as the second highly flexible monomer, 1,6-hexanediol diacrylate was prepared as the high hardness monomer, and Irgacure 819 was prepared as the photoinitiator.

[0138] Next, a monomer mixture is produced by mixing the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer. Next, a photocurable composition is produced by mixing the monomer mixture with a photoinitiator.

[0139] Here, based on 100 parts by weight of the monomer mixture, the first highly flexible monomer is present in an amount of 89 parts by weight, the second highly flexible monomer is present in an amount of 1 part by weight, and the high hardness monomer is present in an amount of 10 parts by weight. Furthermore, the photoinitiator is present in an amount of 5 parts by weight based on 100 parts by weight of the monomer mixture.

[0140] Production of cured films

[0141] The inkjet photopolymerizable composition produced as described above was applied onto a bare glass substrate using an inkjet device (OmniJet, UniJet) to form a single film with a thickness of 10 μm.

[0142] Next, a light emitting diode (LED) 385nm curing agent was used to apply 2.2J / cm 2 A single film was irradiated with ultraviolet (UV) light to produce a cured film (thickness: 10 μm) containing a cured product of the inkjet photopolymerizable composition. Furthermore, for refractive index measurement, a 2 μm-thick cured film produced by spin coating was used.

[0143] Example 2 to Example 20

[0144] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the second highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 5 below.

[0145] [Table 5]

[0146]

[0147] In Table 5, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0148] Example 21 to Example 36

[0149] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the second highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 6 below.

[0150] [Table 6]

[0151]

[0152] In Table 6, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0153] Example 37 to Example 48

[0154] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the second highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 7 below.

[0155] [Table 7]

[0156]

[0157] In Table 7, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0158] Examples 49 to 63

[0159] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the second highly flexible monomer, the type and content of the high hardness monomer, and the type and content of the photoinitiator were adjusted as described in Table 8 below.

[0160] [Table 8]

[0161]

[0162] In Table 8, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0163] Comparative Example

[0164] Comparative Examples 1 to 10

[0165] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the second highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 9 below.

[0166] [Table 9]

[0167]

[0168] In Table 9, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0169] Comparative Examples 11 to 24

[0170] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the second highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 10 below.

[0171] [Table 10]

[0172]

[0173] In Table 10, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0174] Comparative Examples 25 to 32

[0175] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the second highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 11 below.

[0176] [Table 11]

[0177]

[0178] In Table 11, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0179] Comparative Examples 33 to 40

[0180] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the second highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 12 below.

[0181] [Table 12]

[0182]

[0183] In Table 12, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0184] Comparative Examples 41 to 64

[0185] Photocurable compositions and cured films were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 13 below. Comparative Examples 41 to 64 did not contain the second highly flexible monomer.

[0186] [Table 13]

[0187]

[0188] In Table 13, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0189] Comparative Examples 65 to 80

[0190] A photocurable composition and a cured film were produced in the same manner as in Example 1, except that the type and content of the first highly flexible monomer, the type and content of the high hardness monomer, and the content of the photoinitiator were adjusted as described in Table 14 below.

[0191] [Table 14]

[0192]

[0193] In Table 14, the contents (parts by weight) of the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer are based on 100 parts by weight of the monomer mixture. Furthermore, the content (parts by weight) of the photoinitiator is based on 100 parts by weight of the monomer mixture.

[0194] Experimental example

[0195] The following experiments were conducted on the photocurable compositions and cured films produced in Examples 1 to 63 and the photocurable compositions and cured films produced in Comparative Examples 1 to 80. The results are shown in Tables 15 to 34 below.

[0196] 1) Haze

[0197] The haze of a cured film having a thickness of 10 μm was measured using COH 400 manufactured by NIPPONDENSHOKU after the film was left to stand at 85° C. / 85% RH for 500 hours.

[0198] determination

[0199] ◎: When the haze measurement value is less than 0.5

[0200] ○: When the haze measurement value is 0.5 to 1.0 or less

[0201] ×: When the haze measurement value exceeds 1.0

[0202] 2) Sensitivity

[0203] The absorbance of the cured film before and after exposure was compared using a Fourier transform infrared spectrophotometer (FT-IR spectrophotometer). -1 The C=O peak and 780-840 cm -1 The conversion rate was calculated by integrating the C=C peak value, and the sensitivity refers to the exposure amount that is saturated when the conversion rate is 80% or more.

[0204] determination

[0205] ○: Sensitivity value is 3.0J or less

[0206] ×: Sensitivity value exceeds 3.0J

[0207] 3) Refractive index

[0208] The refractive index (average at 555 to 575 nm) of the 2 μm-thick cured film formed on the original glass substrate was measured using an ellipsometer.

[0209] determination

[0210] ◎: When the measured refractive index value of the coating film is less than 1.50

[0211] ×: When the measured refractive index value of the coating film is 1.50 or more

[0212] 4) Transmittance

[0213] The average transmittance of the 10 μm-thick cured film formed on the original glass substrate at 380 to 780 nm was measured using an ultraviolet-visible spectrophotometer (UV-VIS spectrophotometer, Cary 4000, Agilent).

[0214] determination

[0215] ○: The average transmittance is 98% or more

[0216] ×: The average transmittance value is less than 98%

[0217] 5) Viscosity (absolute viscosity)

[0218] The viscosity of each inkjet photopolymerizable composition or monomer in the comparative examples and examples was measured at 25° C. using a viscometer (trade name: Brookfield viscometer).

[0219] determination

[0220] ○: Sensitivity value is 5 to 30 cP

[0221] ×: Viscosity value outside the stated range

[0222] 6) Inkjet characteristics

[0223] While changing the nozzle temperature of the inkjet device, check whether a surface can be formed.

[0224] determination

[0225] When the nozzle temperature is 25 to less than 35℃, the surface is formed:

[0226] Surface formation at nozzle temperature of 35 to 50°C: ○

[0227] Unable to form a surface when the nozzle temperature is 25 to 50°C: ×

[0228] 7) Modulus

[0229] The modulus was measured by applying a 10 μm-thick cured film on bare glass using a nanoindenter (HM500, Helmut Fischer) with a Vickers tip indented to 10% of the thickness.

[0230] ○: Modulus is 1.0 GPa to 1.5 GPa

[0231] ×: Modulus is less than 1.0 GPa or exceeds 1.5 GPa

[0232] 8) Flexibility

[0233] Regarding flexibility, a dog bone-shaped test piece was produced by peeling the 10 μm-thick cured film from bare glass, and the tensile strain was measured using a UTM (Instron).

[0234] determination

[0235] ◎: When the tensile strain is 5% or more

[0236] ○: Tensile strain is 3% to less than 5%

[0237] ×: Tensile strain is less than 3%

[0238] 9) Polarizing plate discoloration due to high temperature / high humidity

[0239] After the polarizing plate was attached to a 10 μm thick cured film formed on the original glass substrate and placed under 65°C / 90% RH conditions for 500 hours, the a* reflection color coordinate change level of the polarizing plate was measured using a spectrophotometer (Konica Minolta CM-5).

[0240] determination

[0241] ◎: When Δa* is less than ±0.5

[0242] ○: When Δa* is ±0.5 or more and less than ±1.0 ×: When Δa* is ±1.0 or more

[0243] [Table 15]

[0244] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Example 1 ◎ O O O O Example 2 ◎ O O O O Example 3 ◎ O O O O Example 4 ◎ O O O O Example 5 ◎ O O O O Example 6 O O O O O Example 7 O O O O O Example 8 O O O O O Example 9 O O O O O Example 10 O O O O O Example 11 O O O O O Example 12 O O O O O Example 13 O O O O O Example 14 O O O O O Example 15 O O O O O Example 16 O O O O O Example 17 O O O O O Example 18 O O O O O Example 19 O O O O O Example 20 O O O O O

[0245] [Table 16]

[0246] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Example 1 ◎ O O O Example 2 ◎ O O ◎ Example 3 O O O O Example 4 O O O O Example 5 ◎ O O O Example 6 ◎ O O ◎ Example 7 O O O O Example 8 O O O O Example 9 ◎ O O O Example 10 ◎ O O ◎ Example 11 O O O O Example 12 O O O O Example 13 ◎ O O O Example 14 ◎ O O ◎ Example 15 O O O O Example 16 O O O O Example 17 ◎ O O O Example 18 ◎ O O ◎ Example 19 O O O O Example 20 O O O O

[0247] Tables 15 and 16 confirm that the photopolymerizable compositions produced using Examples 1 to 20 of the present invention can produce cured films exhibiting low haze, sensitivity, refractive index, and transmittance, achieving excellent inkjet properties. Furthermore, the cured films of the photopolymerizable compositions produced using Examples 1 to 20 exhibit excellent modulus and flexibility, as well as excellent color change stability under high temperature and high humidity conditions.

[0248] [Table 17]

[0249] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Example 21 ◎ O O O O Example 22 ◎ O O O O Example 23 ◎ O O O O Example 24 ◎ O O O O Example 25 O O O O O Example 26 O O O O O Example 27 O O O O O Example 28 O O O O O Example 29 O O O O O Example 30 O O O O O Example 31 O O O O O Example 32 O O O O O Example 33 O O O O O Example 34 O O O O O Example 35 O O O O O Example 36 O O O O O

[0250] [Table 18]

[0251] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Example 21 ◎ O O O Example 22 ◎ O ◎ ◎ Example 23 O O O O Example 24 O O O O Example 25 ◎ O O O Example 26 ◎ O ◎ ◎ Example 27 O O O O Example 28 O O O O Example 29 ◎ O O O Example 30 ◎ O ◎ ◎ Example 31 O O O O Example 32 O O O O Example 33 ◎ O O O Example 34 ◎ O ◎ ◎ Example 35 O O O O Example 36 O O O O

[0252] Referring to Tables 17 and 18, it can be confirmed that the photopolymerizable compositions produced using Examples 21 to 36 of the present invention can produce cured films exhibiting low haze, sensitivity, refractive index, and transmittance, thereby achieving excellent inkjet properties. Furthermore, it can be confirmed that the cured films of the photopolymerizable compositions produced using Examples 21 to 36 exhibit excellent modulus and flexibility, as well as excellent color change stability under high temperature and high humidity conditions.

[0253] [Table 19]

[0254] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Example 37 ◎ O O O O Example 38 ◎ O O O O Example 39 ◎ O O O O Example 40 O O O O O Example 41 O O O O O Example 42 O O O O O Example 43 O O O O O Example 44 O O O O O Example 45 O O O O O Example 46 O O O O O Example 47 O O O O O Example 48 O O O O O

[0255] [Table 20]

[0256] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Example 37 ◎ O O O Example 38 ◎ O ◎ ◎ Example 39 O O O O Example 40 O O O O Example 41 ◎ O O O Example 42 ◎ O O ◎ Example 43 O O O O Example 44 O O ◎ O Example 45 ◎ O O O Example 46 ◎ O O ◎ Example 47 O O ◎ O Example 48 O O ◎ O

[0257] Referring to Tables 19 and 20, it can be confirmed that the photopolymerizable compositions produced in Examples 37 to 48 of the present invention can produce cured films exhibiting low haze, sensitivity, refractive index, and transmittance, thereby achieving excellent inkjet properties. Furthermore, it can be confirmed that the cured films of the photopolymerizable compositions produced in Examples 37 to 48 exhibit excellent modulus and flexibility, and excellent color change stability under high temperature and high humidity conditions.

[0258] [Table 21]

[0259] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Example 49 ◎ O O O O Example 50 O O O O O Example 51 O O O O O Example 52 ◎ O O O O Example 53 O O O O O Example 54 O O O O O Example 55 O O O O O Example 56 O O O O O Example 57 O O O O O Example 58 O O O O O Example 59 ◎ O O O O Example 60 O O O O O Example 61 O O O O O Example 62 O O O O O Example 63 O O O O O

[0260] [Table 22]

[0261] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Example 49 ◎ O ◎ ◎ Example 50 ◎ O ◎ ◎ Example 51 ◎ O ◎ ◎ Example 52 ◎ O ◎ ◎ Example 53 ◎ O ◎ ◎ Example 54 ◎ O ◎ ◎ Example 55 ◎ O ◎ ◎ Example 56 ◎ O ◎ ◎ Example 57 O O ◎ ◎ Example 58 O O ◎ ◎ Example 59 ◎ O ◎ ◎ Example 60 O O ◎ ◎ Example 61 O O ◎ ◎ Example 62 O O ◎ ◎ Example 63 O O ◎ ◎

[0262] Referring to Tables 21 and 22, it can be confirmed that the photopolymerizable compositions produced in Examples 49 to 63 of the present invention can produce cured films exhibiting low haze, sensitivity, refractive index, and transmittance, thereby achieving excellent inkjet properties. Furthermore, it can be confirmed that the cured films of the photopolymerizable compositions produced in Examples 49 to 63 exhibit excellent modulus and flexibility, and excellent color change stability under high temperature and high humidity conditions.

[0263] [Table 23]

[0264] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Comparative Example 1 X O O O O Comparative Example 2 X O O O O Comparative Example 3 X O O O O Comparative Example 4 X O O O O Comparative Example 5 X O O O O Comparative Example 6 X O O O O Comparative Example 7 X O O O O Comparative Example 8 X O O O O Comparative Example 9 X O O O O Comparative Example 10 X O O O O

[0265] [Table 24]

[0266] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Comparative Example 1 O O X O Comparative Example 2 O O X O Comparative Example 3 O O X ◎ Comparative Example 4 O O X O Comparative Example 5 O O X O Comparative Example 6 O O X ◎ Comparative Example 7 O O X O Comparative Example 8 O O X O Comparative Example 9 O O X ◎ Comparative Example 10 O O X O

[0267] Referring to Tables 23 and 24, it can be confirmed that the haze and flexibility characteristics of the photopolymerizable compositions produced in Comparative Examples 1 to 10 were very poor. In other words, Comparative Examples 1 to 10, which did not use the first highly flexible monomer according to one embodiment of the present invention, were unable to produce cured films having excellent haze and flexibility characteristics.

[0268] [Table 25]

[0269] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Comparative Example 11 X O O O O Comparative Example 12 X O O O O Comparative Example 13 X O O O O Comparative Example 14 X O O O O Comparative Example 15 X O O O O Comparative Example 16 X O O O O Comparative Example 17 X O O O O Comparative Example 18 X O O O O Comparative Example 19 X O O O O Comparative Example 20 X O O O O Comparative Example 21 X O O O O Comparative Example 22 X O O O O Comparative Example 23 X O O O O Comparative Example 24 X O O O O

[0270] [Table 26]

[0271] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Comparative Example 11 O O X O Comparative Example 12 O O X ◎ Comparative Example 13 O O X O Comparative Example 14 O O X O Comparative Example 15 O O X ◎ Comparative Example 16 O O X O Comparative Example 17 O O X O Comparative Example 18 O O X ◎ Comparative Example 19 O O X O Comparative Example 20 O O X O Comparative Example 21 O O X ◎ Comparative Example 22 O O X O Comparative Example 23 O O X O Comparative Example 24 O O X ◎

[0272] Referring to Tables 25 and 26, it can be confirmed that the haze and flexibility characteristics of the photopolymerizable compositions produced in Comparative Examples 11 to 24 were very poor. In other words, Comparative Examples 11 to 24, which did not use the first highly flexible monomer according to one embodiment of the present invention, were unable to produce cured films having excellent haze and flexibility characteristics.

[0273] [Table 27]

[0274] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Comparative Example 25 X O O O O Comparative Example 26 X O O O O Comparative Example 27 X O O O O Comparative Example 28 X O O O O Comparative Example 29 X O O O O Comparative Example 30 X O O O O Comparative Example 31 X O O O O Comparative Example 32 X O O O O

[0275] [Table 28]

[0276] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Comparative Example 25 O O O O Comparative Example 26 O O O O Comparative Example 27 O O O ◎ Comparative Example 28 O O O O Comparative Example 29 O O O O Comparative Example 30 O O O ◎ Comparative Example 31 O O O O Comparative Example 32 O O O O

[0277] Referring to Tables 27 and 28, it can be confirmed that the haze properties of the photopolymerizable compositions produced in Comparative Examples 25 to 32 were very poor. Specifically, Comparative Examples 25 to 32, which did not use the second highly flexible monomer according to one embodiment of the present invention, were unable to produce cured films with excellent haze properties.

[0278] [Table 29]

[0279] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Comparative Example 33 O O X O O Comparative Example 34 X O O O O Comparative Example 35 O O X O O Comparative Example 36 X O O O O Comparative Example 37 O O X O O Comparative Example 38 X O O O O Comparative Example 39 O O X O O Comparative Example 40 X O O O O

[0280] [Table 30]

[0281] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Comparative Example 33 O O O ◎ Comparative Example 34 O O O O Comparative Example 35 O O O O Comparative Example 36 O O O ◎ Comparative Example 37 O O O O Comparative Example 38 O O O O Comparative Example 39 O O O ◎ Comparative Example 40 O O O O

[0282] Referring to Tables 29 and 30, it can be confirmed that the photopolymerizable compositions produced in Comparative Examples 33 to 40 were unable to simultaneously achieve low haze values ​​and low refractive index values. In particular, Comparative Examples 33 to 40, which did not use the second highly flexible monomer according to one embodiment of the present invention, were unable to produce cured films exhibiting both low haze values ​​and low refractive index values.

[0283] [Table 31]

[0284] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Comparative Example 41 O O O O O Comparative Example 42 O O O O O Comparative Example 43 O O O O O Comparative Example 44 O O O O O Comparative Example 45 O O O O O Comparative Example 46 O O O O O Comparative Example 47 O O O O O Comparative Example 48 O O O O O Comparative Example 49 O O O O O Comparative Example 50 O O O O O Comparative Example 51 O O O O O Comparative Example 52 O O O O O Comparative Example 53 O O O O O Comparative Example 54 O O O O O Comparative Example 55 O O O O O Comparative Example 56 O O O O O Comparative Example 57 O O O O O Comparative Example 58 O O O O O Comparative Example 59 O O O O O Comparative Example 60 O O O O O Comparative Example 61 O O O O O Comparative Example 62 O O O O O Comparative Example 63 O O O O O Comparative Example 64 O O O O O

[0285] [Table 32]

[0286] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Comparative Example 41 O O X O Comparative Example 42 O O X O Comparative Example 43 O O X O Comparative Example 44 O O X O Comparative Example 45 O O X O Comparative Example 46 O O X O Comparative Example 47 O O X O Comparative Example 48 O O X O Comparative Example 49 O O X O Comparative Example 50 O O X O Comparative Example 51 O O X O Comparative Example 52 O O X O Comparative Example 53 O X X O Comparative Example 54 O X X O Comparative Example 55 O X X O Comparative Example 56 O X X ◎ Comparative Example 57 O X X ◎ Comparative Example 58 O X X ◎ Comparative Example 59 O X X ◎ Comparative Example 60 O X X ◎ Comparative Example 61 O X X ◎ Comparative Example 62 O X X ◎ Comparative Example 63 O X X ◎ Comparative Example 64 O X X ◎

[0287] Referring to Tables 31 and 32, it can be confirmed that the photopolymerizable compositions produced in Comparative Examples 41 to 64 have very poor flexibility properties. Furthermore, it can be confirmed that the photopolymerizable compositions produced in Comparative Examples 53 to 64 also have very poor modulus properties. Specifically, Comparative Examples 41 to 64, which do not contain the second highly flexible monomer according to one embodiment of the present invention, cannot produce cured films with excellent flexibility properties.

[0288] [Table 33]

[0289] 1) Haze 2) Sensitivity 3) Refractive index 4) Transmittance 5) Viscosity Comparative Example 65 - X - - - Comparative Example 66 O O X O O Comparative Example 67 - X - - - Comparative Example 68 - Initiator precipitation - - - Comparative Example 69 - X - - - Comparative Example 70 - Initiator precipitation - - - Comparative Example 71 - X - - - Comparative Example 72 - Initiator precipitation - - - Comparative Example 73 - X - - - Comparative Example 74 - Initiator precipitation - - - Comparative Example 75 - X - - - Comparative Example 76 - Initiator precipitation - - - Comparative Example 77 - X - - - Comparative Example 78 - Initiator precipitation - - - Comparative Example 79 - X - - - Comparative Example 80 - Initiator precipitation - - -

[0290] [Table 34]

[0291] 6) Inkjet characteristics 7) Modulus 8) Flexibility 9) Color change Comparative Example 65 - - - - Comparative Example 66 O O O X Comparative Example 67 - - - - Comparative Example 68 - - - - Comparative Example 69 - - - - Comparative Example 70 - - - - Comparative Example 71 - - - - Comparative Example 72 - - - - Comparative Example 73 - - - - Comparative Example 74 - - - - Comparative Example 75 - - - - Comparative Example 76 - - - - Comparative Example 77 - - - - Comparative Example 78 - - - - Comparative Example 79 - - - - Comparative Example 80 - - - -

[0292] Referring to Tables 33 and 34, it can be confirmed that the cured films of the photopolymerizable compositions produced in Comparative Examples 65 to 80 exhibited extremely poor sensitivity characteristics or exhibited precipitation of the photopolymerization initiator in the cured films. Furthermore, it was confirmed that the refractive index and color change characteristics of Comparative Example 66 were extremely poor. In other words, it was confirmed that the cured films intended by the present invention could not be produced in Comparative Examples 65 to 80, in which the photopolymerization initiator content exceeded the aforementioned range.

[0293] This confirms that the photopolymerizable composition according to one embodiment of the present invention exhibits excellent inkjet properties and can produce a cured film exhibiting low refractive index, high transmittance, and low haze properties after curing. Furthermore, the cured film comprising the cured product of the photopolymerizable composition exhibits excellent modulus and elongation, thereby improving mechanical properties and effectively suppressing discoloration under high temperature and high humidity conditions.

Claims

1. A photopolymerizable composition for inkjet, characterized in that: include: A first highly flexible monomer comprising a photocurable functional group and having a viscosity of 10 cP or more; A second highly flexible monomer comprising a photocurable functional group and having a viscosity of less than 10 cP; A high hardness monomer comprising a photocurable functional group; and One or more photopolymerization initiators.

2. The photopolymerizable composition for inkjet according to claim 1, wherein The first highly flexible monomer comprises a compound represented by the following Chemical Formula 1: [Chemical Formula 1] A-(B)m1—X—(B) n1 —A' In the chemical formula 1, A and A' are photocurable functional groups, B is a hydrocarbon compound containing one or more oxygen atoms, X is a direct bond or an allotrope of a structure having 3 or more carbon atoms, and m1 and n1 are each independently 0 or an integer from 1 to 2.

3. The photopolymerizable composition for inkjet according to claim 1, wherein The liquid phase refractive index (nD) of the first highly flexible monomer 25 ) is 1.47 or less, and the absolute viscosity measured at 25°C is 10 cP or more and 65 cP or less.

4. The photopolymerizable composition for inkjet according to claim 1, wherein The first highly flexible monomer includes at least one of neopentyl glycol propoxylate di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and polypropylene glycol 400 di(meth)acrylate.

5. The photopolymerizable composition for inkjet according to claim 1, wherein The content of the first highly flexible monomer is greater than or equal to 50 parts by weight and less than or equal to 89 parts by weight based on 100 parts by weight of the monomer mixture including the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer.

6. The photopolymerizable composition for inkjet according to claim 1, wherein The liquid phase refractive index (nD) of the second highly flexible monomer 25 ) is 1.45 or less, and the absolute viscosity measured at 25°C is less than 10 cP.

7. The photopolymerizable composition for inkjet according to claim 1, wherein The second highly flexible monomer includes at least one of isodecyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and isostearyl (meth)acrylate.

8. The photopolymerizable composition for inkjet according to claim 1, wherein The content of the second highly flexible monomer is greater than or equal to 1 part by weight and less than or equal to 20 parts by weight based on 100 parts by weight of the monomer mixture including the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer.

9. The photopolymerizable composition for inkjet according to claim 1, wherein The high hardness monomer includes a compound represented by the following Chemical Formula 2: [Chemical Formula 2] (TO) m2 -ALREADY') n2 In Chemical Formula 2, A and A' are photocurable functional groups and are the same or different from each other, Y is an aliphatic structure having 4 to 50 carbon atoms and including or not including one or more oxygen atoms, and includes a linear alkyl structure having at least 4 carbon atoms, and m2 and n2 are each independently an integer of 0 or 1.

10. The photopolymerizable composition for inkjet according to claim 1, wherein The liquid phase refractive index (nD 25 ) is below 1.

49.

11. The photopolymerizable composition for inkjet according to claim 1, wherein The high hardness monomer includes at least one of 1,6-hexanediol di(meth)acrylate, hydroxypivalate neopentyl glycol di(meth)acrylate, and ethyleneoxyethoxyethyl (meth)acrylate.

12. The photopolymerizable composition for inkjet according to claim 1, wherein The content of the high hardness monomer is greater than or equal to 10 parts by weight and less than or equal to 49 parts by weight based on 100 parts by weight of the monomer mixture including the first high flexibility monomer, the second high flexibility monomer, and the high hardness monomer.

13. The photopolymerizable composition for inkjet according to claim 1, wherein The content of the photopolymerization initiator is 5 parts by weight or more and 20 parts by weight or less relative to 100 parts by weight of the monomer mixture including the first highly flexible monomer, the second highly flexible monomer, and the high hardness monomer.

14. The photopolymerizable composition for inkjet according to claim 1, wherein The purity of the first high-flexibility monomer, the second high-flexibility monomer, the high-hardness monomer, and the photopolymerization initiator measured by gas chromatography is 95% or higher.

15. The photopolymerizable composition for inkjet according to claim 1, wherein The viscosity of the inkjet photopolymerizable composition is 5 cP or more and 30 cP or less.

16. A cured film comprising a cured product of a photopolymerizable composition for inkjet, characterized in that: The inkjet photopolymerizable composition comprises: A first highly flexible monomer comprising a photocurable functional group and having a viscosity of 10 cP or more; A second highly flexible monomer comprising a photocurable functional group and having a viscosity of less than 10 cP; High hardness monomer, containing photocurable functional groups; as well as one or more photopolymerization initiators; The haze of the cured film after being left at 85° C. / 85% RH for 500 hours is 0.5 or less. The haze is defined as the degree of diffusion compared to the incident angle of light incident on a transparent film when the haze value of the cured film is measured using a spectrophotometer after the cured film is placed in a constant temperature and humidity chamber at 85° C. for 500 hours and is calculated using the following formula 1: [Formula 1] In the above formula 1, Ir is the transmittance of light transmitted when the incident angle is less than 2.5°, and Is is the transmittance of light transmitted when the incident angle is 2.5° or more.

17. The cured film according to claim 16, wherein The refractive index of the cured film is 1.50 or less.

18. The cured film according to claim 16, wherein The modulus of the cured film is 1 GPa or greater.

19. The cured film according to claim 16, wherein The cured film has an elongation ratio of 5% or more.

20. The cured film according to claim 16, wherein When a polarizing plate is attached to the cured film and left to stand at 65° C. / 90% RH for 500 hours, the change in the reflected color coordinate a* of the polarizing plate is ±0.5 or less.

21. An optical component, characterized in that: The cured film according to claim 16 is included.

22. A display device, characterized in that: The cured film according to claim 16 is contained as at least one of an optical film and a pattern film.

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