Polymerizable composition, encapsulating material and display device

Abstract

One embodiment of the present disclosure provides a polymerizable composition, an encapsulating material including an organic film formed from the polymerizable composition, and a display device including the encapsulating material, the polymerizable composition including: a first monomer having an acryl group; a second monomer having an acryl group and having a viscosity different from that of the first monomer; and a polymerization initiator, and the polymerizable composition having an inkjet performance variation index (IPV) of 19 or less.

Description

[0001] This application is a divisional application. The original application has the application number 2021800105092, the application date is January 22, 2021, and the invention title is "polymerizable composition, encapsulation material and display device". Technical Field

[0002] This disclosure relates to a polymerizable composition, an encapsulating material comprising an organic film formed using the polymerizable composition, and a display device comprising the encapsulating material. More specifically, this disclosure relates to a polymerizable composition having excellent inkjet processing performance, an encapsulating material comprising an organic film formed using the polymerizable composition, and a display device comprising the encapsulating material. Background Technology

[0003] Light-emitting devices are devices that can emit light. Among light-emitting devices, organic light-emitting devices (OLEDs) are used in various fields due to their advantages such as wide viewing angle, excellent contrast characteristics, fast response time, and low power consumption.

[0004] Organic light-emitting devices (OLEDs) degrade upon contact with oxygen or moisture, thus shortening their lifespan. Therefore, to prevent degradation, encapsulation materials can be used to protect OLEDs. These encapsulation materials can include organic films, and the organic films can be formed from polymerizable compositions.

[0005] Recently, methods for forming organic films of encapsulating materials using inkjet printing have been investigated to improve process efficiency. To form organic films of encapsulating materials using inkjet printing, polymeric monomers suitable for inkjet printing are required. Summary of the Invention

[0006] Technical issues

[0007] One aspect of this disclosure is to provide a polymerizable composition that can be used to manufacture organic films using an inkjet process.

[0008] Another aspect of the present invention is to provide a polymerizable composition suitable for inkjet processes, exhibiting excellent stability and not deteriorating even after prolonged storage.

[0009] Another aspect of this disclosure is to provide an encapsulating material comprising an organic film manufactured using a polymerizable composition via an inkjet process, and a display device comprising the encapsulating material.

[0010] Technical solution

[0011] According to one aspect of this disclosure, a polymerizable composition is provided, comprising: a first monomer having an acryloyl group; a second monomer having an acryloyl group and having a viscosity different from that of the first monomer; and a polymerization initiator, wherein the polymerizable composition has a first inkjet droplet performance (Af) and a first inkjet line coating performance (Ag) before a storage test, the polymerizable composition has a second inkjet droplet performance (Bf) and a second inkjet line coating performance (Bg) after being stored in a sealed state at room temperature (25°C ± 10°C) for one year, the polymerizable composition has a third inkjet droplet performance (Cf) and a third inkjet line coating performance (Cg) after being stored in a sealed state at 50°C for one year, and the inkjet performance variation index (IPV) of the polymerizable composition is 19 or less, wherein the inkjet performance variation index (IPV) is obtained using Equation 1 below.

[0012] [Equation 1]

[0013] IPV = (|Af-Bf| / Af) 100 + (|Af-Cf| / Af) 100 + (|Ag-Bg| / Ag) 100 + (|Ag-Cg| / Ag) 100

[0014] According to another aspect of this disclosure, an encapsulation material is provided, comprising an organic film formed from the polymerizable composition.

[0015] According to another aspect of this disclosure, a display device is provided, including the encapsulating material.

[0016] Beneficial effects

[0017] The polymerizable composition according to one embodiment of this disclosure exhibits excellent inkjet performance and has a low inkjet performance variation index (IPV), thereby maintaining its inkjet performance even during long-term storage. Therefore, the polymerizable composition according to one embodiment of this disclosure is highly suitable for inkjet processes, regardless of the length of time the polymerizable composition is stored.

[0018] The polymerizable composition according to one embodiment of the present disclosure can be used to manufacture organic membranes having excellent resistance to moisture and oxygen, as well as encapsulation materials including the organic membranes.

[0019] In addition, display devices including encapsulating materials comprising an organic film formed from a polymerizable composition according to one embodiment of the present disclosure have excellent resistance to moisture and oxygen, thereby maintaining excellent display quality for a long time. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view showing a portion of a display device according to an exemplary embodiment of the present disclosure; Figure 2 This is a graph showing the absorbance of a polymerization initiator according to one embodiment of the present disclosure. Detailed Implementation

[0021] It should be understood that the terminology used herein is for describing particular embodiments only and does not limit the scope of the invention. Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art.

[0022] Furthermore, the terms or words used in this specification and the following claims are intended to be understood based on the principle that the inventors may appropriately define the concepts of the terms in order to best describe the invention, and are to have meanings and concepts consistent with the technical concept of this disclosure as described in this specification, and are not limited to conventional or dictionary meanings.

[0023] The shapes, dimensions, scales, angles, and numbers disclosed in the accompanying drawings to describe embodiments of this disclosure are merely examples, and this disclosure is not limited to the detailed descriptions shown.

[0024] In the following description, detailed descriptions of relevant known functions or constructions will be omitted where such descriptions would unnecessarily obscure the essential points of this disclosure.

[0025] Figure 1 This is a cross-sectional view showing a portion of a display device 100 according to one embodiment.

[0026] Reference Figure 1 According to one embodiment of the present disclosure, a display device 100 includes: a substrate 510, a thin-film transistor (TFT) on the substrate 510, and an organic light-emitting device 570 connected to the TFT. The organic light-emitting device 570 includes: a first electrode 571, an organic light-emitting layer 572 on the first electrode 571, and a second electrode 573 on the organic light-emitting layer 572. Figure 1 The display device 100 shown is an organic light-emitting display device including an organic light-emitting device 570.

[0027] The substrate 510 can be formed of glass or plastic. Specifically, the substrate 510 can be formed of plastic such as polyimide resin. Although not shown, a buffer layer may be provided on the substrate 510.

[0028] A thin-film transistor (TFT) is disposed on a substrate 510. The TFT includes: a semiconductor layer 520; a gate electrode 530 that is insulated from and at least partially overlaps the semiconductor layer 520; a source electrode 541 connected to the semiconductor layer 520; and a drain electrode 542 that is spaced apart from the source electrode 541 and connected to the semiconductor layer 520.

[0029] Reference Figure 1 A gate insulating layer 535 is disposed between the gate electrode 530 and the semiconductor layer 520. An interlayer insulating layer 551 may be disposed on the gate electrode 530, and the source electrode 541 and the drain electrode 542 may be disposed on the interlayer insulating layer 551.

[0030] A planarization layer 552 is disposed on the thin-film transistor TFT to make the top of the thin-film transistor TFT flat.

[0031] The first electrode 571 is disposed on the planarization layer 552. The first electrode 571 is connected to the thin-film transistor (TFT) through a contact hole formed in the planarization layer 552.

[0032] A bank layer 580 is disposed on a planarization layer 552 on a portion of the first electrode 571 to define a pixel region or a light-emitting region. For example, the bank layer 580 may be disposed in a matrix at the boundaries between multiple pixels to define individual pixel regions.

[0033] An organic light-emitting layer 572 is disposed on the first electrode 571. The organic light-emitting layer 572 may also be disposed on the diaphragm layer 580. The organic light-emitting layer 572 may include one light-emitting layer or two or more light-emitting layers stacked in the vertical direction. Light of any color among red, green, and blue can be emitted from the organic light-emitting layer 572, and white light can also be emitted from it.

[0034] The second electrode 573 is disposed on the organic light-emitting layer 572.

[0035] The first electrode 571, the organic light-emitting layer 572, and the second electrode 573 can be stacked to form an organic light-emitting device 570.

[0036] Although not shown, each pixel may include a color filter for filtering the white light emitted from the organic light-emitting layer 572 based on a specific wavelength when the organic light-emitting layer 572 emits white light. The color filter is formed in the optical path.

[0037] Encapsulating material 590 can be disposed on the second electrode 573. Encapsulating material 590 can be formed as a multilayer thin film. Encapsulating material 590 formed as a multilayer thin film is also called a "thin film encapsulation layer". (See reference...) Figure 1The encapsulation material 590 may include at least one organic membrane 592 and at least one inorganic membrane 591 and 593, and the at least one organic membrane 592 and at least one inorganic membrane 591 and 593 may be alternately arranged.

[0038] The encapsulation material 590 can cover the display area of ​​the display device 100 and can extend outside the display area. The encapsulation material 590 may include: a first inorganic film 591, an organic film 592, and a second inorganic film 593.

[0039] A first inorganic film 591 covers the second electrode 573. The first inorganic film 591 may include at least one of ceramics, metal oxides, metal nitrides, metal carbides, metal oxynitrides, silicon oxide, silicon nitride, and silicon oxynitride.

[0040] An organic film 592 is disposed on a first inorganic film 591. The top surface of the organic film 592 may be a flat surface. Specifically, the organic film 592 may have a substantially flat top surface in the region corresponding to the display area. The organic film 592 may include at least one material selected from acrylic resins, methacrylic resins, polyesters, polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate, and hexamethyldisiloxane.

[0041] According to one embodiment of this disclosure, the organic membrane 592 can be formed using a polymerizable composition via an inkjet process. More specifically, the organic membrane 592 can be formed by coating a first inorganic membrane 591 with a polymerizable composition using an inkjet process, followed by polymerization and curing of the polymerizable composition.

[0042] The second inorganic membrane 593 covers the organic membrane 592. The second inorganic membrane 593 may include at least one of ceramics, metal oxides, metal nitrides, metal carbides, metal oxynitrides, silicon oxide, silicon nitride, and silicon oxynitride.

[0043] According to one embodiment of this disclosure, since the encapsulating material 590 has a multilayer structure including a first inorganic film 591, an organic film 592, and a second inorganic film 593, even if cracks form in the encapsulating material 590, the cracks will not be continuous between the first inorganic film 591 and the organic film 592, or between the organic film 592 and the second inorganic film 593. Therefore, the formation of pathways for external moisture or oxygen to permeate into the organic light-emitting device 570 can be prevented, or the formation of such pathways can be minimized.

[0044] Reference Figure 1The touch panel 110 can be mounted on the encapsulation material 590.

[0045] One embodiment of this disclosure provides a polymerizable composition.

[0046] The polymerizable composition according to one embodiment of this disclosure is suitable for inkjet printing. Inkjet printing can be referred to as, for example, "inkjet printing." In inkjet printing, multiple heads connected to multiple inkjet nozzles can be used. Therefore, inkjet printing is advantageous for large-scale or batch production. To make the polymerizable composition suitable for inkjet printing, the viscosity and surface tension of the polymerizable composition according to one embodiment of this disclosure are adjusted.

[0047] According to one embodiment of this disclosure, the organic film 592 included in the encapsulation material 590 of the display device 100 can be manufactured using a polymerizable composition via an inkjet process.

[0048] A polymerizable composition according to one embodiment of this disclosure comprises a first monomer, a second monomer, and a polymerization initiator. The first monomer has an acryloyl group. The second monomer has an acryloyl group and has a viscosity different from that of the first monomer.

[0049] According to one embodiment of this disclosure, the first monomer and the second monomer may be polymerizable. For example, the first monomer and the second monomer may be photopolymerizable. When irradiated with light, the first monomer and the second monomer may polymerize. Furthermore, the first monomer and the second monomer may be photocurable. When irradiated with light, the first monomer and the second monomer may cure.

[0050] According to one embodiment of this disclosure, the first monomer can be represented by the following formula 1.

[0051] [Formula 1]

[0052] C i H j O k

[0053] In Equation 1, i is an integer from 10 to 28, j is an integer from 10 to 54, k is an integer from 1 to 10, and i / k is 2 or higher.

[0054] More specifically, i can be an integer from 10 to 25, j can be an integer from 10 to 40, and k can be an integer from 1 to 8.

[0055] Furthermore, according to one embodiment of this disclosure, i / k can be in the range of 2 to 8, or preferably in the range of 2 to 5.5. For example, i and k in Equation 1 can satisfy the relationship 2≤i / k, 2≤i / k≤8, or 2≤i / k≤5.5.

[0056] The viscosity of the first monomer at 25°C is 1 cPs to 100 cPs. Due to its low viscosity, the first monomer exhibits excellent flowability. Therefore, the processability of inkjet processes using polymerizable compositions containing the first monomer is improved. When the viscosity of the first monomer at 25°C is less than 1 cPs, it is difficult to prepare and store the monomer; when the viscosity is higher than 100 cPs, there is a problem in preparing polymerizable compositions for inkjet processes.

[0057] According to one embodiment of this disclosure, viscosity can be measured by setting the torque of a Brookfield DV2T viscometer to 50% and measuring at 25°C according to a method based on ASTM D 2196. The following also applies.

[0058] According to one embodiment of this disclosure, the viscosity of the first monomer at 25°C can be 1 cPs to 100 cPs, 1 cPs to 50 cPs, 5 cPs to 20 cPs, 1 cPs to 30 cPs, or less than 23 cPs. When the viscosity of the first monomer falls within the above range, the inkjet printing process and curing of the polymerizable composition can proceed smoothly.

[0059] The second monomer has an acryloyl group and has a viscosity different from that of the first monomer.

[0060] According to one embodiment of this disclosure, the second monomer can be represented by the following formula 2.

[0061] [Equation 2]

[0062] C p H q O r

[0063] In Equation 2, p is an integer from 10 to 25, q is an integer from 10 to 40, r is an integer from 1 to 6, and p / r is greater than 2.

[0064] More specifically, p can be an integer from 10 to 20, q can be an integer from 15 to 30, and r can be an integer from 1 to 5.

[0065] Furthermore, according to one embodiment of this disclosure, p / r can be 2 to 8, or preferably 2 to 6. For example, p and r in Equation 1 can satisfy the relations 2≤p / r, 2≤p / r≤8, or 2≤p / r≤6.

[0066] According to one embodiment of this disclosure, at least one of "2≤i / k≤8" and "2≤p / r≤8" can be satisfied.

[0067] The second monomer has a viscosity at 25°C greater than 100 cPs and less than or equal to 500 cPs. When the viscosity of the second monomer at 25°C is less than 100 cPs, the moisture or oxygen barrier efficiency of the organic film manufactured using the polymerizable composition decreases. On the other hand, when the viscosity of the second monomer at 25°C is greater than 500 cPs, there is a problem that it is difficult to prepare the polymerizable composition and the inkjet process using the polymerizable composition is not easy.

[0068] A second monomer with high viscosity can improve the stability of polymerizable compositions, especially storage stability, improve the stability of organic films formed from polymerizable compositions, and improve the moisture or oxygen barrier efficiency of organic films.

[0069] The viscosity of the second monomer at 25°C can be greater than 100 cPs and less than or equal to 200 cPs, can be 120 cPs to 200 cPs, can be greater than 100 cPs and less than or equal to 150 cPs, and can be 110 cPs to 140 cPs.

[0070] According to one embodiment of this disclosure, a first monomer having low viscosity can improve the processability, inkjet processing performance, and polymerizability of the polymerizable composition, while a second monomer having high viscosity can improve the stability of the polymerizable composition and improve the moisture and oxygen barrier properties of the organic film made from the polymerizable composition.

[0071] According to one embodiment of this disclosure, based on the total weight of 100 parts by weight of the first monomer and the second monomer, the content of the first monomer can be from 50 parts by weight to 80 parts by weight, and the content of the second monomer can be from 20 parts by weight to 50 parts by weight. When the content of the first monomer is less than 50 parts by weight based on the total weight of 100 parts by weight of the first monomer and the second monomer, the polymerization rate of the polymerizable monomer decreases due to the influence of the high viscosity of the second monomer, and it becomes difficult to control the viscosity of the polymerizable monomer. On the other hand, when the content of the first monomer is higher than 80 parts by weight and the content of the second monomer is lower than 20 parts by weight, the flowability of the polymerizable monomer increases beyond what is necessary due to its low viscosity. Therefore, the working stability of the inkjet process and the storage stability of the polymerizable monomer deteriorate, and it becomes difficult to control the viscosity of the polymerizable composition.

[0072] According to one embodiment of this disclosure, a first monomer with a viscosity of 1 to 100 cPs at 25°C and a second monomer with a viscosity greater than 100 cPs and less than or equal to 500 cPs at 25°C are mixed in a ratio of 5:5 to 8:2. In this case, inkjet printing and photocuring can be performed well, thereby forming a stable organic film.

[0073] According to one embodiment of this disclosure, the acryloyl group may have both "-C=O" and "-C=C-" groups. According to one embodiment of this disclosure, the acryloyl group may be a portion represented by the following formula 3.

[0074] [Formula 3]

[0075] According to one embodiment of this disclosure, the first monomer and the second monomer may each have an acryloyl group represented by Formula 4 below.

[0076] [Formula 4]

[0077] For example, the first monomer and the second monomer having an acryloyl group can each be an acrylate compound. According to one embodiment of this disclosure, the first monomer and the second monomer can each include an acrylate compound.

[0078] According to one embodiment of this disclosure, the acrylate compound may have a portion represented by the following formula 5.

[0079] [Formula 5]

[0080] According to one embodiment of this disclosure, the first monomer and the second monomer may each have an acrylate group represented by Formula 6 below.

[0081] [Formula 6]

[0082] According to one embodiment of this disclosure, the first monomer and the second monomer may each be a monofunctional (meth)acrylate of a monohydric alcohol or a polyhydric alcohol, or a polyfunctional (meth)acrylate of a monohydric alcohol or a polyhydric alcohol. Here, the monohydric alcohol or polyhydric alcohol may include aliphatic groups and aromatic groups. The aliphatic group may include side-chain, branched, or cyclic hydrocarbon compound groups.

[0083] In addition, the first monomer and the second monomer can each be a monofunctional polymerizable monomer or a polyfunctional polymerizable monomer.

[0084] The first monomer may include, for example, at least one of dodecyl di(meth)acrylate, tetraethylene glycol di(meth)acrylate, and benzyl (meth)acrylate. However, one embodiment of this disclosure is not limited thereto, and other monomers satisfying the requirements of Formula 1 may also be used as the first monomer.

[0085] The second monomer may include, for example, at least one of phenylphenoxyethyl (meth)acrylate and tricyclodecanediethanol di(meth)acrylate. However, one embodiment of this disclosure is not limited thereto, and other monomers satisfying the requirements of Formula 2 may also be used as the second monomer.

[0086] In addition, 2-decyl-1-tetradecane methacrylate, octadecyl methacrylate, 2-octyl-dodecyl methacrylate, 2-hexyl-decyl methacrylate, isooctadecyl methacrylate, lauryl methacrylate, tridecyl methacrylate, etc., can be used as needed.

[0087] According to one embodiment of this disclosure, at least one of the first monomer and the second monomer is a liquid phase. According to one embodiment of this disclosure, depending on the temperature, both the first monomer and the second monomer can be liquid phases, and either the first monomer or the second monomer can be a solid phase.

[0088] According to one embodiment of this disclosure, the amount of polymerization initiator can be less than 5 parts by weight based on the total weight of 100 parts by weight of the first monomer and the second monomer. More specifically, the amount of polymerization initiator can be from 1 to 5 parts by weight or from 3 to 5 parts by weight based on the total weight of 100 parts by weight of the first monomer and the second monomer.

[0089] The polymerization initiator according to one embodiment of this disclosure may be, for example, a photoinitiator. The polymerization initiator according to one embodiment of this disclosure can absorb light to generate free radicals.

[0090] Specifically, the polymerization initiator can absorb light energy to generate free radicals and provide these free radicals to the acryloyl groups contained in the first and second monomers, respectively. According to one embodiment of this disclosure, the polymerizable composition can be polymerized and cured via free radical polymerization upon light irradiation.

[0091] The polymerization initiator may contain, for example, heteroatoms or aryl groups within the molecule.

[0092] According to one embodiment of this disclosure, the polymerization initiator has at least one light absorption peak at a wavelength below 500 nm. More specifically, the polymerization initiator may have a light absorption peak in the wavelength range of 380 nm to 410 nm. According to one embodiment of this disclosure, such a polymerization initiator can polymerize a polymerizable composition by irradiating it with light having a wavelength in the visible light region.

[0093] According to one embodiment of this disclosure, hydroxy ketone photoinitiators, such as 1-hydroxycyclohexylphenyl ketone (Irgacure 184); amino ketone photoinitiators, such as 2-benzyl-2-(dimethylamino)-1-[4-(4-morpholino)phenyl]-1-butanone (Irgacure 369) or α-aminoacetophenone (Irgacure 907); benzyl dimethyl ketal photoinitiators, such as benzyl dimethyl ketal (Irgacure-651); diazylphosphine photoinitiators, such as phenylbis(2,4,6,-trimethylbenzoyl) (Irgacure 819); or monozylphosphine photoinitiators, such as 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO).

[0094] Specifically, according to one embodiment of this disclosure, the polymerization initiator may include at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO), bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and 2,4,6-trimethylbenzoylepoxyphenylphosphine oxide.

[0095] Figure 2 This is a graph showing the absorbance of a polymerization initiator according to one embodiment of the present disclosure. Specifically, Figure 2 This is a graph showing the absorbance of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) as a polymerization initiator.

[0096] According to one embodiment of this disclosure, the polymerizable composition may further comprise at least one additive selected from heat stabilizers, UV stabilizers, and antioxidants. Furthermore, the polymerizable composition may also comprise additives such as surfactants, adhesive aids, stabilizers, adhesion promoters, curing accelerators, thermal polymerization inhibitors, dispersants, plasticizers, fillers, or defoamers, provided they do not adversely affect the polymerizable composition.

[0097] When using additives, the amount of additives can be from 0.001 parts by weight to 10 parts by weight, based on the total weight of 100 parts by weight of the first and second monomers.

[0098] The polymerizable composition according to one embodiment of this disclosure does not contain siloxane monomers. When a polymerizable composition contains siloxane monomers, it is not easy to control the viscosity of the polymerizable composition, and the polymerizable composition may denature or its physical properties may deteriorate when stored for a long period of time, such as about one year, or when stored under harsh conditions. Therefore, the stability of organic films made from polymerizable compositions containing siloxane monomers is reduced.

[0099] Furthermore, when using siloxane monomers, siloxane-based degassing occurs at high temperatures. Therefore, when polymerizable compositions containing siloxane monomers are used as encapsulation materials for organic light-emitting devices, the devices may be damaged.

[0100] According to one embodiment of this disclosure, the polymerizable composition can be prepared as a solvent-free composition. In one embodiment of this disclosure, the term "solvent-free composition" refers to a composition that does not contain a solvent, such as an organic solvent or an aqueous solvent.

[0101] Compared to solvent-containing compositions, solvent-free compositions avoid the solvent drying process, thereby improving process efficiency. Furthermore, when using solvent-free compositions, bubbles are not formed due to the solvent, thus preventing functional degradation of the encapsulating material.

[0102] According to one embodiment of this disclosure, the polymerizable composition has a viscosity and surface tension suitable for inkjet processes.

[0103] When the viscosity of the polymerizable composition is higher than 30 cPs, it is difficult for the polymerizable composition to be ejected from the inkjet nozzle; when the viscosity is less than 1 cPs, it is difficult to form an organic film of appropriate thickness due to excessive fluidity. Therefore, the polymerizable composition according to one embodiment of the present disclosure can have a viscosity of 1 cPs to 30 cPs.

[0104] According to one embodiment of this disclosure, in order to facilitate the ejection of the polymerizable composition from the inkjet head, the surface tension of the polymerizable composition can be in the range of 20 mN / m to 45 mN / m.

[0105] The polymerizable composition according to one embodiment of this disclosure exhibits excellent stability during inkjet printing.

[0106] Prior to the storage test, the polymerizable composition according to one embodiment of this disclosure has a first inkjet droplet property (Af) and a first inkjet line coating property (Ag). Here, the phrase "prior to the storage test" refers to the state in which the polymerizable composition is stored for inkjet processing stability testing. The phrase "prior to the storage test" may be used interchangeably with the phrase "at the initial stage of the storage test".

[0107] Therefore, in the initial stage of storage testing, a polymerizable composition according to one embodiment of the present disclosure may have a first inkjet droplet property (Af) and a first inkjet line coating property (Ag).

[0108] After being stored in a sealed state at room temperature (25°C ± 10°C) for one year, the polymerizable composition according to one embodiment of the present disclosure has a second inkjet droplet property (Bf) and a second inkjet line coating property (Bg).

[0109] According to one embodiment of this disclosure, the polymerizable composition can be sealed in an 18L tank container and stored at a constant temperature. The storage container can be made of a stable material that does not react with the polymerizable composition. For example, the polymerizable composition can be stored in a storage container made of glass or stainless steel.

[0110] In addition, after being stored in a sealed state at 50°C for one year, the polymerizable composition according to one embodiment of the present disclosure has a third inkjet droplet property (Cf) and a third inkjet line coating property (Cg).

[0111] According to one embodiment of the present disclosure, the polymerizable composition has an inkjet performance variation index (IPV) of 19 or less.

[0112] According to one embodiment of this disclosure, the inkjet performance variation index (IPV) is obtained using the following Equation 1.

[0113] [Equation 1]

[0114] IPV = (|Af-Bf| / Af) 100 + (|Af-Cf| / Af) 100 + (|Ag-Bg| / Ag) 100 + (|Ag-Cg| / Ag) 100

[0115] According to one embodiment of this disclosure, in order to measure the first inkjet droplet performance (Af), 5g of a polymerizable composition is first fed into a DMC head, which serves as the inkjet head, installed in a measuring device, namely an Omnijet 300 from Unijet Co., Ltd. The temperature of the inkjet head is set to 35°C, and a 13-picoliter droplet of the polymerizable composition is jetted onto a glass substrate to form a droplet on the glass substrate. Five minutes after droplet formation, the diameter of the droplet is measured using a microscope. The measured diameter of the droplet formed on the glass substrate using the polymerizable composition is referred to as the "first inkjet droplet performance" of the polymerizable composition.

[0116] The second inkjet droplet performance (Bf) was measured on samples collected from the polymerizable composition after one year of storage in a sealed state at room temperature (25°C ± 10°C). The method for measuring the second inkjet droplet performance (Bf) was the same as that for measuring the first inkjet droplet performance (Af).

[0117] The third inkjet droplet performance (Cf) was measured on samples collected from the polymerizable composition after one year of storage in a sealed state at 50°C. The method for measuring the third inkjet droplet performance (Cf) was the same as that for measuring the first inkjet droplet performance (Af).

[0118] According to one embodiment of this disclosure, to measure the first inkjet line coating performance (Ag), firstly, 5g of a polymerizable composition is fed into a DMC head, which serves as the inkjet head, installed in a measuring device, namely an Omnijet 300 from Unijet Co., Ltd. The temperature of the inkjet head is adjusted to 35°C, and 400 drops of the polymerizable composition (wherein, each drop is quantitatively measured as 13 picoliters of polymerizable composition) are sprayed onto a glass substrate to form a line with a length of 1 inch (2.54 cm) on the glass substrate. After forming the line with the polymerizable composition for 5 minutes, the width of the middle portion of the line is measured using a microscope. The measured width of the line formed on the glass substrate by the polymerizable composition is referred to as the "first inkjet line coating performance" of the polymerizable composition.

[0119] The second inkjet line coating performance (Bg) can be measured on samples collected from the polymerizable composition after being stored in a sealed state at room temperature (25°C ± 10°C) for one year using the same method as the first inkjet line coating performance (Ag).

[0120] The third inkjet line coating performance (Cg) can be measured on samples collected from polymerizable compositions after being stored in a sealed state at 50°C for one year, using the same method as the first inkjet line coating performance (Ag).

[0121] According to one embodiment of this disclosure, when the inkjet performance variation index (IPV) of the polymerizable composition is 19 or less, the polymerizable composition exhibits excellent inkjet processing stability. Therefore, the inkjet processing performance does not deteriorate during use, and the quality remains virtually unchanged. Thus, the reliability of the organic film manufactured from the polymerizable composition according to one embodiment of this disclosure can be ensured. Consequently, the stability and reliability of the encapsulation material 590 and the display device 100 including the organic film can be improved.

[0122] The inkjet performance variation index (IPV) of the polymerizable composition according to one embodiment of the present disclosure may be 19 or less, and may be 3 to 9, or may be 5.1 to 7.2.

[0123] According to one embodiment of this disclosure, the first inkjet droplet property (Af) can be from 216 μm to 231 μm, the second inkjet droplet property (Bf) can be from 213 μm to 229 μm, and the third inkjet droplet property (Cf) can be from 212 μm to 228 μm. The polymerizable composition having inkjet droplet properties within these ranges can exhibit excellent inkjet performance not only immediately after preparation but also after prolonged storage. Therefore, when using the polymerizable composition according to one embodiment of this disclosure, organic films with excellent moisture and oxygen barrier properties can be prepared regardless of storage time.

[0124] According to one embodiment of this disclosure, the first inkjet line coating performance (Ag) can be from 279 μm to 290 μm, the second inkjet line coating performance (Bg) can be from 273 μm to 285 μm, and the third inkjet line coating performance (Cg) can be from 273 μm to 285 μm. Polymerizable compositions having inkjet line coating performance within these ranges can exhibit excellent inkjet performance not only immediately after preparation but also after prolonged storage. Therefore, when using the polymerizable composition according to one embodiment of this disclosure, organic films with excellent moisture and oxygen barrier properties can be prepared regardless of storage time.

[0125] Additionally, the polymerizable composition according to one embodiment of this disclosure may have a first viscosity (Ab) before a storage test, a second viscosity (Bb) after one year of sealed storage at room temperature (25°C ± 10°C), and a third viscosity (Cb) after one year of sealed storage at 50°C.

[0126] The first viscosity (Ab) of the polymerizable composition prior to the storage test was measured at 25°C using the method specified in ASTM D 2196 and a DV2T viscometer from Brookfield. Specifically, 0.5 ml of the polymerizable composition was loaded into the DV2T viscometer from Brookfield, and the first viscosity (Ab) was measured at 50% torque.

[0127] The second viscosity (Bb) was measured on samples collected from the polymerizable composition after one year of storage in a sealed state at room temperature (25°C ± 10°C). The method for measuring the second viscosity (Bb) was the same as that for measuring the first viscosity (Ab).

[0128] The third viscosity (Cb) was measured on samples collected from the polymerizable composition after one year of storage in a sealed state at 50°C. The method for measuring the third viscosity (Cb) was the same as that for measuring the first viscosity (Ab).

[0129] According to one embodiment of this disclosure, at 25°C, the first viscosity (Ab) can be from 19.5 cPs to 22.0 cPs, the second viscosity (Bb) can be from 19.8 cPs to 22.2 cPs, and the third viscosity (Cb) can be from 19.8 cPs to 23.0 cPs. Polymerizable compositions having viscosities within these ranges can exhibit excellent inkjet performance and can be efficiently used to manufacture organic films.

[0130] Additionally, the polymerizable composition according to one embodiment of this disclosure may have a first surface tension (Ae) before a storage test, a second surface tension (Be) after one year of sealed storage at room temperature (25°C ± 10°C), and a third surface tension (Ce) after one year of sealed storage at 50°C.

[0131] According to the method specified in ISO 304, the first surface tension (Ae) of the polymerizable composition prior to storage testing was measured using an O-ring with a K9 tensiometer from KRUSS. Specifically, 20 g of the polymerizable composition was placed into an O-ring using a K9 tensiometer from KRUSS, and the first surface tension (Ae) was measured in Max mode.

[0132] The second surface tension (Be) was measured on samples collected from the polymerizable composition after one year of storage in a sealed state at room temperature (25°C ± 10°C). The method for measuring the second surface tension (Be) was the same as that for measuring the first surface tension (Ae).

[0133] The third surface tension (Ce) was measured on samples collected from the polymerizable composition after one year of storage at 50°C in a sealed state. The method for measuring the third surface tension (Ce) was the same as that for measuring the first surface tension (Ae).

[0134] According to one embodiment of this disclosure, the first surface tension (Ae) can be from 35.0 mN / m to 35.9 mN / m, the second surface tension (Be) can be from 35.2 mN / m to 36.1 mN / m, and the third surface tension (Ce) can be from 35.2 mN / m to 36.1 mN / m. A polymerizable composition having surface tensions within the above ranges can be readily ejected from the inkjet head because its surface tension is sufficient. Therefore, the polymerizable composition can be smoothly ejected by the inkjet equipment.

[0135] When the surface tension of the polymerizable composition is too high, the ink droplets of the polymerizable composition disperse; when the surface tension is too low, the spreading or dispersion of the solution increases, exceeding what is needed when it collides with the object to be coated. Therefore, according to one embodiment of this disclosure, the first surface tension (Ae), the second surface tension (Be), and the third surface tension (Ce) are adjusted as described above.

[0136] According to one embodiment of this disclosure, the acryloyl index (MH1) of the first monomer can be from 0.5 to 5.0, and the acryloyl index (MH1) of the second monomer can be from 0.1 to 3.0. The acryloyl index (MH1) can be obtained using Equation 2 below.

[0137] [Equation 2]

[0138] MH1 = (Molecular weight of monomer) X) / {Total number of atoms in the monomer (Total number of carbon atoms in the monomer - Total number of oxygen atoms in the monomer)

[0139] In Equation 2, X is the number of acryloyl groups.

[0140] The higher the acrylamide index (MH1), the greater the proportion of acrylamide groups. Since acrylamide groups participate in polymerization, it can be inferred that the polymerization efficiency of the polymerizable composition increases with the increase of the acrylamide index (MH1).

[0141] When the acrylamide index (MH1) of the first monomer is less than 0.5, the polymerizability of the polymerizable composition deteriorates; when MH1 is greater than 5.0, the polymerizability of the polymerizable composition increases excessively. When the acrylamide index (MH1) of the second monomer is less than 0.1, the polymerizability of the polymerizable composition deteriorates; when MH1 is greater than 3.0, the polymerizability of the polymerizable composition increases excessively.

[0142] According to one embodiment of this disclosure, the acryloyl index (MH1) of the first monomer can be 0.5 to 5.0, 0.5 to 4.0, or 0.7 to 3.0.

[0143] When the acryloyl index (MH1) of the first monomer is 0.5 to 5.0, the acryloyl index (MH1) of the second monomer is 0.1 to 3.0, and the viscosity of the polymerizing monomer is below 30 cPs, curing can proceed smoothly and process efficiency can be improved.

[0144] The polymerizable composition according to one embodiment of the present disclosure has a low moisture concentration. For example, the moisture (H2O) concentration of the polymerizable composition according to one embodiment of the present disclosure can be less than 40 ppm. Therefore, when the organic film 592 of the encapsulation material 590 is formed using the polymerizable composition according to one embodiment of the present disclosure, damage to the organic light-emitting device 570 due to moisture contained in the organic film 592 can be prevented.

[0145] Another embodiment of this disclosure provides an organic membrane manufactured from a polymerizable composition according to one embodiment of this disclosure.

[0146] An organic film according to another embodiment of this disclosure can be formed by polymerization and curing of a polymerizable composition according to one embodiment of this disclosure. The organic film can be formed by coating the composition using an inkjet process, followed by polymerization and curing of the coating.

[0147] According to another embodiment of this disclosure, the polymerization and curing of the polymerizable composition can be carried out by light irradiation. Light applied to the irradiation includes, for example, electromagnetic waves such as microwaves, infrared rays, ultraviolet rays, and gamma rays; or electron beams such as alpha particle beams, proton beams, and neutron beams.

[0148] According to another embodiment of this disclosure, the polymerization of the polymerizable composition can be carried out by irradiation with light of a wavelength below 500 nm. For example, the polymerization of the polymerizable composition can be carried out using visible light or ultraviolet light. For polymerization, light with a wavelength of 290 nm to 450 nm can be irradiated, and light with a center wavelength of 380 nm to 410 nm can be irradiated. The light intensity can be, for example, less than or equal to 400 mW / cm². 2 And it can reach 100mW / cm 2 Up to 400mW / cm 2 Within a certain range. The dose of light irradiated can be up to 300 mJ / cm². 2 Up to 2,500 mJ / cm 2 Within the range or 500mJ / cm 2 Up to 1,500 mJ / cm 2 Within the range.

[0149] According to another embodiment of this disclosure, the thickness of the organic film can be from 0.5 μm to 100 μm. More specifically, the thickness of the organic film can be from 1 μm to 90 μm, and the thickness can be from 5 μm to 70 μm.

[0150] Based on a thickness of 8 μm, the organic film according to another embodiment of this disclosure can have a transmittance of more than 97.0% relative to light with a wavelength of 400 nm.

[0151] Another embodiment of this disclosure provides an encapsulation material 590 comprising an organic film manufactured using a polymerizable composition according to one embodiment of this disclosure. Encapsulation material 590 as... Figure 1 As shown in the diagram. The encapsulation material 590 may include: a first inorganic membrane 591, an organic membrane 592, and a second inorganic membrane 593, and Figure 1 The organic film 592 can be formed using a polymerizable composition according to one embodiment of the present disclosure by an inkjet process, such as inkjet printing.

[0152] When the polymerizable composition according to one embodiment of the present disclosure is used, an organic film 592 with excellent inkjet processing characteristics can be easily manufactured even after the polymerizable composition has been stored at room temperature for more than one year before use, thereby enabling the manufacture of an encapsulating material 590 with excellent moisture and oxygen barrier properties.

[0153] Furthermore, since the organic film 592 formed from the polymerizable composition according to one embodiment has excellent light transmittance, the visibility of the display device 100 to which the encapsulation material 590 is applied can be improved.

[0154] Another embodiment of this disclosure provides a display device 100 including the encapsulation material 590 as described above. The display device 100 may have, for example, Figure 1 The structure shown is described below. A detailed description of the display device 100 will be omitted below to avoid repetition.

[0155] Another embodiment of this disclosure provides a method for preparing a polymerizable composition.

[0156] A method for preparing a polymerizable composition according to another embodiment of the present disclosure includes mixing a first monomer, a second monomer, and a polymerization initiator.

[0157] The first monomer is represented by Formula 1 below, having an acryloyl group, and at 25 o The viscosity at C is 1 cPs to 100 cPs.

[0158] [Formula 1]

[0159] C i H j O k

[0160] In Equation 1, i is an integer from 10 to 25, j is an integer from 10 to 40, k is an integer from 1 to 6, and i / k is 2 or higher.

[0161] The second monomer is represented by Formula 2 below, which has an acryloyl group and is 25 oThe viscosity at C is higher than 100 cPs and less than or equal to 500 cPs.

[0162] [Equation 2]

[0163] C p H q O r

[0164] In Equation 2, p is an integer from 10 to 28, q is an integer from 10 to 54, r is an integer from 1 to 6, and p / r is greater than 2.

[0165] The first monomer, the second monomer, and the polymerization initiator have already been described, so their detailed descriptions will be omitted to avoid repetition.

[0166] According to another embodiment of this disclosure, in order to prepare the polymerizable composition, the tank used for preparing the polymerizable composition is first cleaned.

[0167] Acetone can be used to clean the tank. For example, acetone can be used to clean the tank and pipes.

[0168] Then, the raw materials are fed into the tank and mixed to prepare a mixed solution.

[0169] The raw materials used to prepare the polymerizable composition include a first monomer, a second monomer, and a polymerization initiator. The first monomer, the second monomer, and the polymerization initiator are fed into a tank and then mixed. Specifically, based on the total weight of 100 parts by weight of the first and second monomers, 50 to 80 parts by weight of the first monomer, 20 to 50 parts by weight of the second monomer, and less than 5 parts by weight of the polymerization initiator can be used. More specifically, based on the total weight of 100 parts by weight of the first and second monomers, the amount of polymerization initiator can be 1 to 5 parts by weight or 3 to 5 parts by weight.

[0170] According to one embodiment of this disclosure, the polymerization initiator may include at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO), bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and 2,4,6-trimethylbenzoylepoxyphenylphosphine oxide.

[0171] When the polymerization initiator is a solid, it dissolves in the monomer. The polymerization initiator can dissolve in the first monomer, the second monomer, or in a monomer solution containing a mixture of the first and second monomers.

[0172] The polymerization initiator can be dissolved using a small amount of monomer alone. For example, after dissolving the polymerization initiator in a portion of the first monomer, the solution of the polymerization initiator in the first monomer is added to a mixed solution of the first and second monomers. Alternatively, after dissolving the polymerization initiator in a portion of the second monomer, the solution of the polymerization initiator in the second monomer is added to a mixed solution of the first and second monomers.

[0173] When the solid polymerization initiator is not completely dissolved, it will precipitate during prolonged storage of the polymerizable composition, and the haze of the polymerizable composition will increase. Therefore, polymerization and curing cannot proceed smoothly during the formation of organic films using the polymerizable composition, and the optical properties of the organic films formed using the polymerizable composition will deteriorate. Therefore, it is important to ensure that the polymerization initiator is completely dissolved in the monomer.

[0174] According to one embodiment of this disclosure, in order to completely dissolve the polymerization initiator, a mixture of the polymerization initiator and the monomer is stirred at 40°C and a stirring speed of 100 rpm for 4 hours. As a result, a mixed solution containing a first monomer, a second monomer, and a polymerization initiator is prepared.

[0175] Then, the mixed solution containing the first monomer, the second monomer, and the polymerization initiator is filtered by circulation.

[0176] Specifically, to remove foreign matter and fine particles from the mixed solution, a 0.05 μm filter is installed between the bottom of the tank and the packaging line. Then, nitrogen gas (N2) with a purity of 99.999% is introduced at a rate of 1.2 kgf / cm³ while maintaining the tank temperature at 23°C ± 5°C. 2 The pressure is injected into the tank to circulate and filter the gas at a stirring speed of 50 rpm. Nitrogen (N2) is used as the purge gas, and moisture is removed by passing nitrogen (N2) through it.

[0177] The circulating filtration is performed for more than 20 hours, and during the circulating filtration process, the water contained in the mixed solution is removed to complete the polymerizable composition. As a result of the circulating filtration, the polymerizable composition according to one embodiment of the present disclosure can be given a water (H2O) concentration of less than 50 ppm or less than 40 ppm.

[0178] Furthermore, according to another embodiment of this disclosure, the polymerizable composition contains very few or no particles. Specifically, the polymerizable composition does not contain particles with a particle size greater than 0.5 μm, and contains particles with a particle size less than 0.5 μm at a density of less than 22 particles / L. When particles are present in the polymerizable composition, problems such as pinhole formation in organic films manufactured using the polymerizable composition can occur. Therefore, the particle content in the polymerizable composition must be minimized.

[0179] The resulting polymerizable composition is stored in a tank container. To achieve storage stability, the polymerizable composition is fed into the tank container, filled with nitrogen, and then the container is sealed.

[0180] The present disclosure will be described in more detail below through specific embodiments and comparative examples. The embodiments and comparative examples described below are provided to illustrate the content of the present disclosure and should not be construed as limiting the scope of the present disclosure.

[0181] <Examples and Comparative Examples>

[0182] <Single>

[0183] Use the monomers listed in Table 1 below to prepare polymerizable compositions.

[0184] [Table 1]

[0185] In Table 1, the term “C / O ratio” refers to the i / k value of the first monomer as expressed by Equation 1 below, or the p / r value of the second monomer as expressed by Equation 2 below.

[0186] [Formula 1]

[0187] C i H j O k

[0188] [Equation 2]

[0189] C p H q O r

[0190] In Table 1, MH1 refers to the acrylamide index and is calculated using Equation 2 below.

[0191] [Equation 2]

[0192] MH1 = (Molecular weight of monomer) X) / {Total number of atoms in the monomer (Total number of carbon atoms in the monomer - Total number of oxygen atoms in the monomer)

[0193] In Equation 2, X is the number of acryloyl groups.

[0194] 1,12-dodecanediol dimethacrylate (first monomer A1) can be represented by the following formula 7.

[0195] [Formula 7]

[0196] Tetra(glycol) diacrylate (first monomer A2) can be represented by the following formula 8.

[0197] [Formula 8]

[0198] Benzyl acrylate (first monomer A3) can be represented by the following formula 9.

[0199] [Formula 9]

[0200] 2-Phenylenoxyethyl acrylate (second monomer B1) can be represented by the following formula 10.

[0201] [Formula 10]

[0202] Tricyclodecanediethanol diacrylate (second monomer B2) can be represented by the following formula 11.

[0203] [Equation 11]

[0204] 3-(trimethoxysilyl)propyl methacrylate (comparative monomer) can be represented by the following formula 12.

[0205] [Equation 12]

[0206] <Preparation of polymerizable compositions>

[0207] The polymerizable compositions according to Examples 1 to 6 and Comparative Examples 1 to 6 were prepared using the first monomer (A1, A2, A3), the second monomer (B1, B2), and the comparative monomer (C1) in the amounts of parts by weight listed in Table 2 below. In Table 2, the content of each component is based on parts by weight. 2,4,6-Trimethylbenzoyl-diphenylphosphine oxide (TPO) was used as the polymerization initiator. The amount of polymerization initiator used was 3 parts by weight based on 100 parts by weight of all monomers.

[0208] [Table 2]

[0209] <Example 1>

[0210] First, clean the tank and pipes with acetone.

[0211] Based on the content ratios listed in Table 2, 130g of the first monomer A1, 70g of the second monomer B1, and 6g of the polymerization initiator (TPO) were fed into the tank.

[0212] To completely dissolve the polymerization initiator, the mixture of the polymerization initiator and the first and second monomers was stirred at 100 RPM for 4 hours at 40°C. As a result, a mixed solution containing the first monomer, the second monomer, and the polymerization initiator was prepared.

[0213] Then, a mixed solution containing the first monomer, the second monomer, and the polymerization initiator is filtered through a circulating system. Specifically, a 0.05 μm filter is installed in the tank and on the packaging line, and then 99.999% pure nitrogen (N2) is introduced at a rate of 1.2 kgf / cm³ while maintaining the tank temperature at 23°C ± 5°C. 2 The pressure is injected into the tank, and the mixture is circulated and filtered at a stirring speed of 50 rpm. Nitrogen (N2) is used as the purge gas to remove moisture.

[0214] The circulating filtration was performed for more than 20 hours, and during the circulating filtration process, the water contained in the mixed solution was removed to complete the polymerizable composition. After circulating filtration, the water (H2O) concentration of the polymerizable composition according to Example 1 was 35 ppm.

[0215] In addition, the polymerizable composition according to Example 1 does not contain particles with a particle size of 0.5 μm or larger, but contains particles with a particle size of less than 0.5 μm at a density of 5 particles / L or less.

[0216] The polymerizable composition thus completed according to Example 1 was stored in a nitrogen-filled canister, then packaged and sealed.

[0217] <Example 2>

[0218] Except that, based on the content ratios listed in Table 2, 130g of the first monomer A2, 70g of the second monomer B2 and 6g of the polymerization initiator (TPO) were fed into the tank, the polymerizable composition was prepared in the same manner as in Example 1.

[0219] <Example 3>

[0220] Except that, based on the content ratios listed in Table 2, 130g of the first monomer A1, 70g of the second monomer B2 and 6g of the polymerization initiator (TPO) were fed into the tank, the polymerizable composition was prepared in the same manner as in Example 1.

[0221] <Example 4>

[0222] Except that, based on the content ratios listed in Table 2, 130g of the first monomer A2, 70g of the second monomer B1 and 6g of the polymerization initiator (TPO) were fed into the tank, the polymerizable composition was prepared in the same manner as in Example 1.

[0223] <Example 5>

[0224] Except that, based on the content ratios listed in Table 2, 100g of first monomer A1, 30g of first monomer A3, 70g of second monomer B1 and 6g of polymerization initiator (TPO) were fed into the tank, the polymerizable composition was prepared in the same manner as in Example 1.

[0225] <Example 6>

[0226] Except that, based on the content ratios listed in Table 2, 100g of first monomer A2, 30g of first monomer A3, 70g of second monomer B2 and 6g of polymerization initiator (TPO) were fed into the tank, the polymerizable composition was prepared in the same manner as in Example 1.

[0227] <Comparative Example 1>

[0228] Except that, based on the content ratios listed in Table 2, 130g of the first monomer A1, 70g of the comparative monomer C1 and 6g of the polymerization initiator (TPO) were fed into the tank, the polymerizable composition was prepared in the same manner as in Example 1.

[0229] <Comparative Example 2>

[0230] Except that, based on the content ratios listed in Table 2, 130g of the first monomer A2, 70g of the comparative monomer C1 and 6g of the polymerization initiator (TPO) were fed into the tank, the polymerizable composition was prepared in the same manner as in Example 1.

[0231] <Comparative Example 3>

[0232] Except that, based on the content ratios listed in Table 2, 200 g of the first monomer A1 and 6 g of the polymerization initiator (TPO) were fed into the tank, the polymerizable composition was prepared in the same manner as in Example 1.

[0233] <Experimental Example>

[0234] (1) Measuring moisture content

[0235] Measurement standard: Measured using the Karl Fischer method.

[0236] Measuring device: Metrohm 831KF coulomb meter

[0237] Measurement mode: Karl Fischer titration mode

[0238] Measurement method: 0.5 g of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3 was collected using a syringe and injected into a coulometer to measure the moisture content.

[0239] The measurement results are shown in Table 3 below.

[0240] (2) Measuring the number of particles

[0241] Measuring device: SLS-1200 from NanoVision Technology

[0242] Measurement conditions: Sample mode in a cleanroom

[0243] Measurement method: 200g of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3 was collected into a clean bottle and injected into a measuring device at a suction rate of 5mL to measure the number of particles per liter (L, unit volume).

[0244] The measurement results are shown in Table 3 below.

[0245] [Table 3]

[0246] (3) Measuring inkjet droplet performance

[0247] Measuring device: Omnijet 300 from Unijet Co., Ltd., DMC cartridge head

[0248] First, 5g of the polymerizable composition was fed into the DMC head (inkjet head) of the measuring device, specifically the Omnijet 300 from Unijet Co., Ltd. The inkjet head temperature was set to 35°C, and a 13-picoliter drop of the polymerizable composition was sprayed onto a glass substrate to form a droplet. After 5 minutes of droplet formation, the diameter of the droplet was measured using a microscope. The measured diameter of the droplet formed on the glass substrate using the polymerizable composition is referred to as the "inkjet droplet performance" of the polymerizable composition.

[0249] First inkjet droplet performance (Af): The inkjet droplet performance of each polymerizable composition according to Examples 1 to 6 and Comparative Examples 1 to 3, measured prior to the storage test, is referred to as "first inkjet droplet performance (Af)".

[0250] Second inkjet droplet performance (Bf): The inkjet droplet performance of each polymerizable composition according to Examples 1 to 6 and Comparative Examples 1 to 3, measured after being stored in a sealed container at room temperature (25°C ± 10°C) for one year, is referred to as "second inkjet droplet performance (Bf)".

[0251] Third inkjet droplet performance (Cf): The inkjet droplet performance of each polymerizable composition according to Examples 1 to 6 and Comparative Examples 1 to 3, measured after one year of storage in a sealed container at 50°C (temperature variation range: ±5°C), is referred to as "third inkjet droplet performance (Cf)".

[0252] The results are shown in Table 4 below.

[0253] [Table 4]

[0254] In Table 4, the inkjet droplet index is calculated as "(|Af-Bf| / Af)". 100”+“(|Af-Cf| / Af) The sum of 100.

[0255] As can be seen from Table 4, the polymerizable compositions according to Examples 1 to 6 have low inkjet droplet indices, experience small changes in inkjet performance after prolonged storage, and are very stable during inkjet processing. On the other hand, it can be seen that the polymerizable compositions according to Comparative Examples 1 to 3 have high inkjet droplet indices, experience large changes in inkjet performance after prolonged storage, and are unstable during inkjet processing.

[0256] (4) Measure the coating performance of the inkjet line

[0257] Measuring device: Omnijet 300 from Unijet Co., Ltd., DMC cartridge head

[0258] 5g of the polymerizable composition was fed into the DMC head (inkjet head) of an Omnijet 300 inkjet printer from Unijet Co., Ltd., installed in a measuring device. The inkjet head temperature was adjusted to 35°C, and 400 drops of the polymerizable composition (one droplet was determined to contain 13 picoliters of polymerizable composition by quantitative measurement) were sprayed onto a glass substrate to form a 1-inch (2.54 cm) long line on the glass substrate. After forming the line with the polymerizable composition for 5 minutes, the width of the middle portion of the line was measured using a microscope. The measured width of the line formed by the polymerizable composition on the glass substrate is referred to as the "inkjet line coating performance" of the polymerizable composition.

[0259] First inkjet line coating performance (Ag): The inkjet line coating performance of each polymerizable composition according to Examples 1 to 6 and Comparative Examples 1 to 3, measured prior to the storage test, is referred to as "first inkjet line coating performance (Ag)".

[0260] Second inkjet line coating performance (Bg): The inkjet line coating performance of each polymerizable composition according to Examples 1 to 6 and Comparative Examples 1 to 3, measured after being stored in a sealed container at room temperature (25°C ± 10°C) for one year, is referred to as "second inkjet line coating performance (Bg)".

[0261] Third inkjet line coating performance (Cg): The inkjet line coating performance of each polymerizable composition according to Examples 1 to 6 and Comparative Examples 1 to 3, measured after being stored in a sealed container at 50°C for one year, is referred to as "third inkjet line coating performance (Cg)".

[0262] The results are shown in Table 5 below.

[0263] [Table 5]

[0264] In Table 5, the inkjet line coating index is calculated as (|Ag-Bg| / Ag). 100+(|Ag-Cg| / Ag) The sum of 100.

[0265] Inkjet line coating index = (|Ag-Bg| / Ag) 100+(|Ag-Cg| / Ag) 100

[0266] As can be seen from Table 5, the polymerizable compositions according to Examples 1 to 6 have low inkjet line coating indices, experience small changes in inkjet performance after long-term storage, and are very stable during inkjet processing. On the other hand, it can be seen that the polymerizable compositions according to Comparative Examples 1 to 3 have high inkjet line coating indices, experience large changes in inkjet performance after long-term storage, and are unstable during inkjet processing.

[0267] (5) Measure viscosity

[0268] Measurement standard: Measured according to the method specified in ASTM D 2196.

[0269] Measuring device: DV2T model from Brookfield

[0270] Measurement conditions: Cone-plate mode

[0271] Temperature measured: 25°C

[0272] Measurement method: Load 0.5 ml of the polymerizable composition and set the torque to 50%.

[0273] First viscosity (Ab): The viscosity of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3, measured prior to the storage test, is called "first viscosity (Ab)".

[0274] Second viscosity (Bb): The viscosity of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3, measured after one year of storage in a sealed container at room temperature (25°C ± 10°C), is called "second viscosity (Bb)".

[0275] Third viscosity (Cb): The viscosity of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3, measured after being stored in a sealed container at 50°C for one year, is called "third viscosity (Cb)".

[0276] The results are shown in Table 6 below.

[0277] [Table 6]

[0278] In Table 6, the viscosity index is calculated as "(|Ab-Bb| / Ab"). "100" and "(|Ab-Cb| / Ab)" The sum of 100.

[0279] Viscosity index = (|Ab - Bb| / Ab) 100 + (|Ab-Cb| / Ab) 100

[0280] As can be seen from Table 6, the polymerizable compositions according to Examples 1 to 6 have low viscosity indices, undergo small viscosity changes after long-term storage, and are very stable in terms of viscosity.

[0281] (6) Measure surface tension

[0282] Measurement standard: Measured according to the method specified in ISO 304.

[0283] Measuring device: K9 tension meter from KRUSS

[0284] Measurement mode: O-ring, Max mode

[0285] Measurement method: 20g of the polymerizable composition was placed into an O-ring using a KRUSS K9 tensiometer and the first surface tension (Ae) was measured in Max mode.

[0286] First surface tension (Ae): The surface tension of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3, measured prior to the storage test, is referred to as "first surface tension (Ae)".

[0287] Second surface tension (Be): The surface tension of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3, measured after one year of storage in a sealed container at room temperature (25°C ± 10°C), is called "second surface tension (Be)".

[0288] Third surface tension (Ce): The surface tension of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3, measured after being stored in a sealed container at 50°C for one year, is called "third surface tension (Ce)".

[0289] The results are shown in Table 7 below.

[0290] [Table 7]

[0291] In Table 7, the surface tension index is calculated as "(|Ae-Be| / Ae)". 100”+“(|Ae-Ce| / Ae) The sum of 100.

[0292] Surface tension index = (|Ae - Be| / Ae) 100 + (|Ae-Ce| / Ae) 100

[0293] As can be seen from Table 7, the polymerizable compositions according to Examples 1 to 6 have low surface tension indices, experience small changes in surface tension after long-term storage, and are very stable in terms of surface tension.

[0294] Inkjet Performance Variation Index (IPV)

[0295] The inkjet performance variation index (IPV) of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3 was calculated according to Equation 1 below.

[0296] [Equation 1]

[0297] IPV = (|Af-Bf| / Af) 100 + (|Af-Cf| / Af) 100 + (|Ag-Bg| / Ag) 100 + (|Ag-Cg| / Ag) 100

[0298] The inkjet performance variation index (IPV) of each polymerizable composition prepared in Examples 1 to 6 and Comparative Examples 1 to 3 is shown in Table 8 below.

[0299] [Table 8]

[0300] As can be seen from Table 8, the polymerizable compositions according to Examples 1 to 6 have low inkjet performance variation index (IPV) and undergo only small changes in inkjet performance even during long-term storage, thus they are stable. On the other hand, it can be seen that the polymerizable compositions according to Comparative Examples 1 to 3 have high inkjet performance variation index (IPV) and undergo deterioration in inkjet performance during long-term storage, thus they are unstable.

[0301] The features, structures, effects, etc., described in the above embodiments can be combined or modified by those skilled in the art to which the embodiments pertain, resulting in other embodiments. Therefore, any content relating to such combinations and modifications should be understood to fall within the scope of this disclosure.

[0302] [Figure Labels]

[0303] 100: Display device; 110: Touch panel

[0304] 510: Substrate; 520: Semiconductor layer

[0305] 530: Gate electrode; 541: Source electrode

[0306] 542: Drain electrode; 570: Organic light-emitting device.

[0307] 571: First electrode; 572: Organic light-emitting layer

[0308] 573: Second electrode; 590: Encapsulation material

[0309] 591: First inorganic membrane 592: Organic membrane

[0310] 593: Second Inorganic Membrane

Claims

1. A polymerizable composition comprising: The first monomer has an acryloyl group; The second monomer has an acryloyl group and has a viscosity different from that of the first monomer; and Polymerization initiator, in, The polymerizable composition exhibits first inkjet droplet properties (Af) and first inkjet line coating properties (Ag) prior to the storage test. The polymerizable composition exhibits second inkjet droplet properties (Bf) and second inkjet line coating properties (Bg) after being stored in a sealed state at room temperature (25℃±10℃) for one year. The polymerizable composition exhibits third inkjet droplet properties (Cf) and third inkjet line coating properties (Cg) after being stored in a sealed state at 50°C for one year. The inkjet performance variation index (IPV) of the polymerizable composition is below 19. The inkjet performance variation index (IPV) is obtained according to the following equation 1: [Equation 1] IPV = (|Af-Bf| / Af) 100 + (|Af-Cf| / Af) 100 + (|Ag-Bg| / Ag) 100 + (|Ag-Cg| / Ag) 100, The first inkjet droplet performance (Af) is the diameter of the droplet measured 5 minutes after a 13-picoliter drop of the polymerizable composition was ejected onto a glass substrate prior to a storage test to form the droplet. The first inkjet line coating performance (Ag) is the width of the middle portion of a 1-inch (2.54 cm) line formed on a glass substrate from a polymerizable composition, wherein the width is measured after the line has been formed by spraying 400 drops of the polymerizable composition onto the glass substrate prior to a storage test, wherein each drop contains 13 picoliters of the polymerizable composition. The second inkjet droplet performance (Bf) was measured in the same manner as the first inkjet droplet performance (Af) on samples collected from the polymerizable composition after being stored in a sealed state at room temperature (25°C ± 10°C) for one year. The second inkjet line coating performance (Bg) was measured in the same manner as the first inkjet line coating performance (Ag) on ​​samples collected from the polymerizable composition after being stored in a sealed state at room temperature (25°C ± 10°C) for one year. The third inkjet droplet performance (Cf) was measured in the same manner as the first inkjet droplet performance (Af) on samples collected from the polymerizable composition after being stored in a sealed state at 50°C for one year. The third inkjet line coating performance (Cg) was measured in the same manner as the first inkjet line coating performance (Ag) on ​​samples collected from the polymerizable composition after being stored in a sealed state at 50°C for one year. The water (H2O) concentration of the polymerizable composition is below 40 ppm.

2. The polymerizable composition according to claim 1, wherein, The first monomer is represented by the following formula 1: [Formula 1] C i H j O k Where i is an integer from 10 to 28, j is an integer from 10 to 54, k is an integer from 1 to 6, and i / k is 2 or higher. The second monomer is represented by the following formula 2: [Equation 2] C p H q O r Where p is an integer from 10 to 25, q is an integer from 10 to 40, r is an integer from 1 to 6, and p / r is greater than 2.

3. The polymerizable composition according to claim 2, wherein, It satisfies at least one of the relations "2≤i / k≤8" and "2≤p / r≤8".

4. The polymerizable composition according to claim 1, wherein, The viscosity of the first monomer at 25°C is 1 cPs to 100 cPs, and The viscosity of the second monomer at 25°C is greater than 100 cPs and less than or equal to 500 cPs.

5. The polymerizable composition according to claim 1, wherein, Based on the total of 100 parts by weight of the first monomer and the second monomer, the content of the first monomer is 50 to 80 parts by weight, and the content of the second monomer is 20 to 50 parts by weight.

6. The polymerizable composition according to claim 1, wherein, The polymerization initiator has at least one light absorption peak at a wavelength below 500 nm.

7. The polymerizable composition according to claim 1, wherein, The inkjet performance variation index (IPV) of the polymerizable composition is 5.1 to 7.

2.

8. The polymerizable composition according to claim 1, wherein, The first inkjet droplet performance (Af) is 216 μm to 231 μm, the second inkjet droplet performance (Bf) is 213 μm to 229 μm, and the third inkjet droplet performance (Cf) is 212 μm to 228 μm.

9. The polymerizable composition according to claim 1, wherein, The coating performance (Ag) of the first inkjet line is 279 μm to 290 μm, the coating performance (Bg) of the second inkjet line is 273 μm to 285 μm, and the coating performance (Cg) of the third inkjet line is 273 μm to 285 μm.

10. The polymerizable composition according to claim 1, wherein, The polymerizable composition has a first viscosity (Ab) before the storage test, a second viscosity (Bb) after one year of sealed storage at room temperature (25°C ± 10°C), and a third viscosity (Cb) after one year of sealed storage at 50°C. Among them, in 25 o At C, the first viscosity (Ab) is 19.5 cPs to 22.0 cPs, the second viscosity (Bb) is 19.8 cPs to 22.2 cPs, and the third viscosity (Cb) is 19.8 cPs to 23.0 cPs.

11. The polymerizable composition according to claim 1, wherein, The polymerizable composition exhibits a first surface tension (Ae) prior to the storage test, a second surface tension (Be) after one year of sealed storage at room temperature (25°C ± 10°C), and a third surface tension (Ce) after one year of sealed storage at 50°C. Wherein, the first surface tension (Ae) is 35.0 mN / m to 35.9 mN / m, the second surface tension (Be) is 35.2 mN / m to 36.1 mN / m, and the third surface tension (Ce) is 35.2 mN / m to 36.1 mN / m.

12. An encapsulating material comprising an organic film formed using a polymerizable composition according to any one of claims 1 to 11.

13. A display device comprising the encapsulating material according to claim 12.

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