Stretchable electrochromic device composition, method for manufacturing electrochromic member, and stretchable electrochromic device manufactured thereby

Abstract

The present invention relates to a stretchable electrochromic device composition, a method for manufacturing an electrochromic member, and a stretchable electrochromic device manufactured thereby. The electrochromic device composition according to an embodiment of the present invention comprises: a polymer resin; a chromic material; and a plasticizer. In one embodiment, the plasticizer is a main plasticizer and propylene carbonate (PC). In another embodiment, the plasticizer is a main plasticizer, propylene carbonate (PC), and ethylene carbonate (EC).

Description

Stretchable electrochromic device composition, method for manufacturing electrochromic member, and stretchable electrochromic device manufactured thereby

[0001] The present invention relates to a stretchable electrochromic device composition, a method for manufacturing an electrochromic member, and a stretchable electrochromic device manufactured thereby. The present invention includes propylene carbonate (PC), propylene carbonate, and ethylene carbonate (EC).

[0002] This invention is the result of the project titled 'Development of Dielectric / Ion Conductor Based on Plasticized Polymer and Application to Next-Generation Organic Electronic Devices Using 3D Printing', which was conducted with the support of the National Research Foundation of Korea and the funding from the Ministry of Science and ICT in 2024 (RS-2024-00348475).

[0003] An electrochromic device is a device that contains an electrochromic material and changes color in response to an externally applied voltage. Various materials, such as polymer compounds and metal oxides, are used as the electrochromic material, and the color changes reversibly in response to a voltage applied to the electrode.

[0004] Recently, the application of these electrochromic devices has been expanding, including in smart window systems that block external gaze and sunlight, and in automotive glass that displays information such as maps and text.

[0005] Conventional electrochromic devices utilize liquid electrochromic materials, which can lead to electrolyte leakage and limit their use in flexible displays. Recently, solidified water-based electrolytes have been developed, but the water readily evaporates, necessitating the installation of an additional protective layer to prevent this.

[0006] Prior art includes Korean Patent Publication No. 10-2078481.

[0007] The purpose of the present invention is to provide a stretchable electrochromic device composition with improved discoloration efficiency and discoloration speed, a method for manufacturing an electrochromic member, and a stretchable electrochromic device manufactured thereby.

[0008] In addition, the present invention has light transparency and elasticity.

[0009] Additionally, it has a long lifespan and excellent durability.

[0010] Additionally, it has flexibility and elasticity, making it applicable to various fields.

[0011] Additionally, the manufacturing method is simple, which allows for increased production efficiency and reduced manufacturing costs.

[0012] An electrochromic device composition according to an embodiment of the present invention comprises a polymer resin, a color-changing material, and a plasticizer. In one embodiment, the plasticizer is a primary plasticizer and propylene carbonate (PC). In another embodiment, the plasticizer is a primary plasticizer, propylene carbonate (PC), and ethylene carbonate (EC).

[0013] When the above plasticizer is a primary plasticizer and propylene carbonate, the propylene carbonate may be included in an amount of 3 to 11 wt% based on the weight of the primary plasticizer.

[0014] When the above plasticizer is a primary plasticizer, propylene carbonate, and ethylene carbonate, the propylene carbonate may be included in an amount of 2 to 8 wt% based on the weight of the primary plasticizer, and the ethylene carbonate may be included in an amount of 2 to 8 wt% based on the weight of the primary plasticizer.

[0015] When the above plasticizer is a main plasticizer and propylene carbonate, the propylene carbonate may be included in an amount of 35 to 85 wt% based on the weight of the polymer resin.

[0016] When the above plasticizer is a main plasticizer, propylene carbonate and ethylene carbonate, the propylene carbonate may be included in an amount of 25 to 75 wt% based on the weight of the polymer resin, and the ethylene carbonate may be included in an amount of 25 to 75 wt% based on the weight of the polymer resin.

[0017] When the above plasticizer is a main plasticizer, propylene carbonate and ethylene carbonate, the weight ratio of the propylene carbonate and ethylene carbonate may be 3:1 to 1:3.

[0018] The above-mentioned main ingredient may be dibutyl adipate (DBA).

[0019]

[0020] A method for manufacturing an electrochromic member according to an embodiment of the present invention comprises the steps of: preparing a mixture by dissolving a polymer resin in a solvent; adding a plasticizer to the mixture; and adding a color-changing material to the mixture. In one embodiment, the plasticizer is a primary plasticizer and propylene carbonate (PC). In another embodiment, the plasticizer is a primary plasticizer, propylene carbonate (PC), and ethylene carbonate (EC).

[0021]

[0022] An electrochromic device according to an embodiment of the present invention includes an electrochromic device layer, wherein the electrochromic device layer is manufactured by drying an electrochromic device composition including a polymer resin, a color-changing material, and a plasticizer. In one embodiment, the plasticizer is a primary plasticizer and propylene carbonate (PC). In another embodiment, the plasticizer is a primary plasticizer, propylene carbonate (PC), and ethylene carbonate (EC).

[0023] A method for manufacturing a stretchable electrochromic device composition and an electrochromic member according to an embodiment of the present invention can provide a stretchable electrochromic device with improved discoloration efficiency and discoloration speed.

[0024] In addition, the present invention has light transparency and elasticity.

[0025] Additionally, it has a long lifespan and excellent durability.

[0026] Additionally, it has flexibility and elasticity, making it applicable to various fields.

[0027] Additionally, the manufacturing method is simple, which allows for increased production efficiency and reduced manufacturing costs.

[0028] FIG. 1 illustrates a method for manufacturing an electrochromic member according to one embodiment of the present invention.

[0029] Figure 2 illustrates the measurement results of ionic conductivity of an electrochromic member manufactured according to one embodiment.

[0030] Figure 3 illustrates the measurement results of the light transmittance of an electrochromic member manufactured according to one embodiment.

[0031] Figure 4 shows the discoloration efficiency of an electrochromic member manufactured according to one embodiment.

[0032] FIG. 5 illustrates a method for manufacturing an electrochromic member according to another embodiment of the present invention.

[0033] Figure 6 illustrates the measurement results of ionic conductivity of an electrochromic member manufactured according to another embodiment.

[0034] Figure 7 illustrates the measurement results of the light transmittance of an electrochromic member manufactured according to another embodiment.

[0035] Fig. 8 shows the discoloration efficiency of an electrochromic member manufactured according to another embodiment.

[0036] Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings. However, the embodiments of the present invention may be modified in various ways, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more fully explain the present invention to those of ordinary skill in the art.

[0037]

[0038] Electrochromic device composition

[0039] An electrochromic device composition according to an embodiment of the present invention comprises a polymer resin, a color-changing material, and a plasticizer. In one embodiment, the plasticizer is a primary plasticizer and propylene carbonate (PC). In another embodiment, the plasticizer is a primary plasticizer, propylene carbonate (PC), and ethylene carbonate (EC).

[0040]

[0041] The above polymer resin forms the basic body of the electrochromic device composition. The above polymer resin may have light transmittance, flexibility, and elasticity when plasticized by a plasticizer. For this purpose, the polymer resin may be at least one of polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), polyurethane (PU), polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), polyethylene oxide (PEO), polyimide (PI), and polyethylene terephthalate (PET). In particular, by using polyvinyl chloride (PVC), high light transmittance, flexibility, and elasticity can be achieved. The above polyvinyl chloride can be expressed by the following structural formula 1.

[0042] [Structural formula 1]

[0043]

[0044] (n is a natural number)

[0045]

[0046] One embodiment includes a primary plasticizer and propylene carbonate (PC) as the plasticizer. Another embodiment includes a primary plasticizer, propylene carbonate (PC) and ethylene carbonate (EC) as the plasticizer. A plasticizer is a substance that plasticizes the polymer resin.

[0047] The above-mentioned main ingredient is not particularly limited, but may be dibutyl adipate (DBA).

[0048] The above dibutyl adipate can be expressed by the structural formula 2 below.

[0049] [Structural formula 2]

[0050]

[0051] The content of the primary plasticizer may be 700 to 1200 parts by weight, preferably 700 to 1000 parts by weight, and more preferably 700 to 900 parts by weight, based on 100 parts by weight of the polymer resin. If the content of the primary plasticizer is too low, crystals are easily formed in the manufactured electrochromic device, and if the content of the primary plasticizer is too high, mechanical properties may decrease.

[0052]

[0053] The above propylene carbonate (PC) increases the ionic conductivity of the electrochromic device, thereby improving the color change speed and color change efficiency. The above propylene carbonate can be expressed by structural formula 3.

[0054] [Structural formula 3]

[0055]

[0056] In one embodiment in which a primary plasticizer and propylene carbonate are included as the plasticizer, the propylene carbonate may be included in an amount of 3 to 11 wt%, preferably 10 to 10.5 wt%, based on the weight of the primary plasticizer. In addition, the propylene carbonate may be included in an amount of 35 to 85 wt%, preferably 80 to 85 wt%, based on the weight of the polymer resin. If the content of the propylene carbonate is too high, leakage and cloudy gelation may occur, and if the content is too low, ionic conductivity is not sufficiently improved.

[0057] In another embodiment in which the primary plasticizer, polypropylene carbonate, and ethylene carbonate are included as the plasticizer, the propylene carbonate may be included in an amount of 2 to 8 wt%, preferably 4 to 6 wt%, based on the weight of the primary plasticizer. In addition, the propylene carbonate may be included in an amount of 25 to 75 wt% based on the weight of the polymer resin. If the content of the propylene carbonate is too high, leakage and cloudy gelation may occur, and if the content is too low, ionic conductivity is not sufficiently improved.

[0058]

[0059] The above ethylene carbonate (EC) is a material with a high dielectric constant that increases the number of free ions in an electrochromic device. The above ethylene carbonate can be expressed by structural formula 4.

[0060] [Structural formula 4]

[0061]

[0062] In another embodiment in which the primary plasticizer, polypropylene carbonate, and ethylene carbonate are included as the plasticizer, the ethylene carbonate may be included in an amount of 2 to 8 wt%, preferably 4 to 6 wt%, based on the weight of the primary plasticizer. In addition, the ethylene carbonate may be included in an amount of 25 to 75 wt% based on the weight of the polymer resin. If the content of the ethylene carbonate is too high, it does not dissolve, causing a problem in that a solid is formed on the surface of the gel, and if the content is too low, the ionic conductivity is not sufficiently improved.

[0063] In another embodiment, the weight ratio of the propylene carbonate and ethylene carbonate may be 3:1 to 1:3, preferably 6:4 to 4:6, and more preferably 1:1. In this content range, the ionic conductivity, color change speed, and color change efficiency of the electrochromic device are the best.

[0064]

[0065] In the present embodiment, the discoloring material may be a material used for discoloring the polymer gel, and according to the present embodiment, DHV[TFSI]2 may be used, but is not limited thereto. Meanwhile, the DHV[TFSI]2 may be represented by the following structural formula 5.

[0066] [Structural Formula 5]

[0067]

[0068] The content of the above discoloring material may be 5 to 100 parts by weight, preferably 10 to 20 parts by weight, per 100 parts by weight of the polymer resin.

[0069]

[0070] The above electrochromic device composition may further include an ionic liquid. An ionic liquid is generally a substance that can improve the movement of ions and electrons while maintaining a non-volatile liquid state at 100°C or lower. Various ionic liquids may be used, but 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI) is preferably used. By limiting the ionic liquid in this way, the light transmittance of the electrochromic device layer can be maintained at a high level. The EMIM-TFSI can be expressed by the following structural formula 6.

[0071] [Structural formula 6]

[0072]

[0073] The content of the ionic liquid may be 100 to 200 parts by weight, preferably 110 to 130 parts by weight, based on 100 parts by weight of the polymer resin. If the content of the ionic liquid is too high, the light transmittance may decrease.

[0074]

[0075] The above electrochromic device composition may further include a reducing agent, and the reducing agent may be an anode redox compound. The anode redox compound may be any one of ferrocene and dimethyl ferrocene (dmFC), preferably dimethyl ferrocene. The dimethyl ferrocene may be expressed by the following structural formula 7.

[0076] [Structural formula 7]

[0077]

[0078] The content of the above anode redox compound may be 1 to 20 parts by weight, preferably 12 to 18 parts by weight, per 100 parts by weight of the polymer resin.

[0079]

[0080] Method for manufacturing electrochromic material

[0081] A method for manufacturing an electrochromic member according to an embodiment of the present invention comprises the steps of: preparing a mixture by dissolving a polymer resin in a solvent; adding a plasticizer to the mixture; and adding a discoloring material to the mixture. In one embodiment, the plasticizer is a primary plasticizer and propylene carbonate (PC). In another embodiment, the plasticizer is a primary plasticizer, propylene carbonate (PC), and ethylene carbonate (EC). The present invention may further include a step of adding an additive such as an ionic liquid or a reducing agent. In addition, the present invention may further include a step of removing a solvent from the mixed solution.

[0082]

[0083] The polymer resin, main plasticizer, propylene carbonate, ionic liquid, reducing agent, etc. are the same as those described above.

[0084]

[0085] The step of preparing a mixture by dissolving the polymer resin in a solvent involves mixing the polymer resin with the solvent and then stirring. The solvent may be a polar organic solvent. This is to easily dissolve the polymer resin, such as PVC. The polar organic solvent may be any one of dioxane, tetrahydrofuran (THF), acetone, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), and 1-methyl-2-pyrrolidone (NMP). The content of the solvent may be an amount sufficient to dissolve the polymer resin. This step may be performed at room temperature.

[0086]

[0087] In the step of adding a plasticizer to the mixture, in one embodiment, the plasticizer is a primary plasticizer and propylene carbonate (PC), and in another embodiment, the plasticizer is a primary plasticizer, propylene carbonate (PC), and ethylene carbonate (EC). The plasticizers may be mixed in any order, but preferably, the primary plasticizer is added first to increase the plasticization and ion conductivity efficiency of the polymer resin. In this case, the step may include a step of adding a primary plasticizer to the mixture, and a step of adding propylene carbonate, or propylene carbonate and ethylene carbonate, to the mixture to which the primary plasticizer has been added.

[0088] In one embodiment, in the step of adding a primary polymer to the mixture, the content of the primary polymer may be 700 to 1200 parts by weight, preferably 700 to 1000 parts by weight, and more preferably 750 to 850 parts by weight, based on 100 parts by weight of the polymer resin.

[0089] In another embodiment, in the step of adding a primary plasticizer to the mixture, the content of the primary plasticizer may be 700 to 1200 parts by weight, preferably 700 to 1000 parts by weight, and more preferably 700 to 900 parts by weight, based on 100 parts by weight of the polymer resin. In the step of adding propylene carbonate and ethylene carbonate to the mixture to which the primary plasticizer has been added, propylene carbonate and ethylene carbonate may be mixed first and stirred, and then added to the mixture to which the primary plasticizer has been added.

[0090]

[0091] The step of adding a discoloring agent to the above mixture may involve directly adding the discoloring agent to the mixture. Alternatively, the discoloring agent may be dissolved in a solvent to prepare a discoloring agent solution, which may then be mixed with the previously prepared mixture. The solvent may be any solvent capable of dissolving the discoloring agent and may vary depending on the discoloring agent. The solvent may be any one of dioxane, tetrahydrofuran (THF), acetone, dimethyl sulfoxide (DMSO), dimethylformamide (DMF), and 1-methyl-2-pyrrolidone (NMP).

[0092]

[0093] The present invention may further include a step of adding additives such as ionic liquids and reducing agents. Each step may be performed regardless of the order of the preceding steps and each step. Preferably, this step may be performed after the step of mixing the plasticizer.

[0094]

[0095] The step of removing the solvent from the above mixed solution can be performed by drying the mixture at room temperature or in an oven.

[0096]

[0097] electrochromic devices

[0098] An electrochromic device according to an embodiment of the present invention comprises a first electrode; a second electrode; and an electrochromic device layer that changes color by a voltage applied to the first electrode and the second electrode; wherein the electrochromic device layer comprises the composition for an electrochromic device described above.

[0099]

[0100] The above first and second electrodes are not particularly limited to those commonly used in electrical devices. However, they may be made of ITO glass or ITO-PEN to have light transmittance and flexibility.

[0101]

[0102] The above electrochromic element layer includes the composition for an electrochromic element described above, and the composition for an electrochromic element may be manufactured to an appropriate size and thickness according to the method for manufacturing an electrochromic member described above.

[0103]

[0104] In one embodiment, the electrochromic element layer is manufactured by drying an electrochromic element composition comprising a polymer resin, a color-changing material, a primary plasticizer, and propylene carbonate (PC). In another embodiment, the electrochromic element layer is manufactured by drying an electrochromic element composition comprising a polymer resin, a color-changing material, a primary plasticizer, propylene carbonate (PC), and ethylene carbonate (EC).

[0105] The polymer resin, main plasticizer, propylene carbonate, ethylene carbonate, ionic liquid, reducing agent, etc. are the same as those described above.

[0106]

[0107] Example: Manufacturing of an electrochromic member according to one embodiment

[0108] Example 1 (D8.5P0.5): PVC was purchased from Scientific Polymer Products, Inc., DBA from TCI, PC from Daejung Chemicals & Metals Co., Ltd., EMIM-TFSI from io-li-tec, dmFC from TCI, and THF as a solvent was purchased from Daejung Chemicals & Metals Co., Ltd. 0.3531 g of PVC was dissolved in 25 mL of THF by stirring at room temperature, and 3.0012 g of DBA was added and stirred. 0.1471 g of PC was added, and 0.4237 g of EMIM-TFSI, 20.2483 g of DHV [TFSI], and 0.0581 g of dmFC were added and stirred at room temperature. The stirred mixture was poured into a petri dish and dried at room temperature for 24 hours. The manufactured electrochromic member was a gel-type film with a thickness of 0.5 mm.

[0109]

[0110] Example 2 (D8P1): It was manufactured in the same manner as Example 1, except that 0.3545 g of PVC, 2.8358 g of DBA, 0.2954 g of PC, and 0.4254 g of EMIM-TFSI were used.

[0111]

[0112] Comparative Example 1 (D9P0): It was manufactured in the same manner as Example 1 except that 0.3517 g of PVC, 3.1653 g of DBA, and 0.4220 g of EMIM-TFSI were used and PC was not added.

[0113]

[0114] Comparative Example 2 (D7.5P1.5): It was manufactured in the same manner as Example 1 except that 0.3559 g of PVC, 2.6691 g of DBA, 0.4448 g of PC, and 0.4271 g of EMIM-TFSI were used.

[0115]

[0116] Experimental Example: Measuring Ionic Conductivity

[0117] Examples 1 and 2 and Comparative Examples 1 and 2 were cut into 10 mm X 10 mm sizes, placed on Pt-coated electrodes, and covered with Pt-coated electrodes again. The gap between the electrodes was 0.3 mm. Using a potentiostat (Biologics, SP240), 10 5 -10 -1 Ionic conductivity was measured under Hz, 10 mV AC conditions. The measured results are shown in Fig. 2.

[0118] Referring to Figure 2, the ionic conductivity was the best in Example 2.

[0119]

[0120] Experimental Example: Transmittance Measurement

[0121] Examples 1 and 2 and Comparative Examples 1 and 2 were cut to a size of 2 cm X 2 cm, placed on an ITO-PET electrode, and then covered with an ITO-PET electrode to manufacture an electrochromic device.

[0122] A UV–visible spectrophotometer (Perkin Elmer, Lambda 465) and a potentiostat (Biologics, SP240) were used, and the electrochromic devices of the examples and comparative examples were set to 100% baseline, and UV-vis spectra were measured at 607 nm. The measured results are shown in Fig. 3.

[0123] Referring to Figure 3, it can be seen that in Example 2, the change in light transmittance is the fastest and the discoloration speed is the best.

[0124]

[0125] Experimental Example: Calculating Color Efficiency

[0126] The discoloration efficiency was measured using the formula below for Examples 1 and 2 and Comparative Example 1, and the results are shown in Table 1 and Fig. 4.

[0127] [ceremony]

[0128]

[0129] (η is the color change efficiency, ΔQ is the charge change, ΔOD is the optical density change at ΔQ, T b is the transmittance of the colorless state, T c is the light transmittance in the discolored state)

[0130] Ionic conductivity (mS / cm)T c,max (%)ΔT max (%)t c,90% (s)t b,90% (s)η (cm 2 / C) Comparative Example 10.214360.699.31325162.13 Exemplary Example 10.390670.199.91123177.69 Exemplary Example 20.554770.199.71121184.93

[0131] Referring to Table 1 and Figure 4, it can be seen that the discoloration efficiency of Example 2 is the best.

[0132]

[0133] Example: Manufacturing of an electrochromic member according to another embodiment

[0134] Example 3 (D8P0.75E0.25): PVC was purchased from Scientific Polymer Products, Inc., DBA from TCI, PC from Daejung Chemicals & Metals Co., Ltd., EC from Daejung Chemicals & Metals Co., Ltd., EMIM-TFSI from io-li-tec, dmFC from TCI, and THF as a solvent was purchased from Daejung Chemicals & Metals Co., Ltd. First, 0.2216 g of PC and 0.0738 g of EC were mixed at room temperature. 0.3545 g of PVC was dissolved in 25 mL of THF by stirring at room temperature, and 2.8358 g of DBA was added thereto and stirred. The previously mixed mixture of PC and EC was added thereto, and 0.4254 g of EMIM-TFSI, 20.2483 g of DHV[TFSI], and 0.0581 g of dmFC were added thereto and stirred at room temperature. The stirred mixture was poured into a petri dish and dried at room temperature for 24 hours. The manufactured electrochromic material was a gel-type film with a thickness of 0.5 mm.

[0135]

[0136] Example 4 (D8P0.5E0.5): It was manufactured in the same manner as Example 1, except that 0.1477 g of PC and 0.1477 g of EC were added.

[0137]

[0138] Example 5 (D8P0.25E0.75): It was manufactured in the same manner as Example 1, except that 0.0738 g of PC and 0.2216 g of EC were added.

[0139]

[0140] Comparative Example 3 (D9P0E0): It was manufactured in the same manner as Example 1, except that 0.3517 g of PVC, 3.1653 g of DBA, and 0.4220 g of EMIM-TFSI were added, and PC and EC were not added.

[0141]

[0142] Comparative Example 4 (D8P1E0): It was manufactured in the same manner as Example 1, except that 0.2954 g of PC was added and EC was not added.

[0143]

[0144] Experimental Example: Measuring Ionic Conductivity

[0145] Examples 3 to 5 and Comparative Examples 3 to 4 were cut into 10 mm X 10 mm sizes, placed on Pt-coated electrodes, and covered with Pt-coated electrodes again. The gap between the electrodes was 0.3 mm. Using a potentiostat (Biologics, SP240), 10 5 -10 -1 Ionic conductivity was measured under Hz, 10 mV AC conditions. The measured results are shown in Fig. 5.

[0146] Referring to Figure 5, the ionic conductivity was the best in Example 4.

[0147]

[0148] Experimental Example: Transmittance Measurement

[0149] Examples 3 to 5 and Comparative Examples 3 to 4 were cut into a size of 2 cm X 2 cm, placed on an ITO-PET electrode, and then covered with an ITO-PET electrode to manufacture an electrochromic device.

[0150] A UV–visible spectrophotometer (Perkin Elmer, Lambda 465) and a potentiostat (Biologics, SP240) were used, and the electrochromic devices of the examples and comparative examples were set to 100% baseline, and UV-vis spectra were measured at 607 nm. The measured results are shown in Fig. 7.

[0151] Referring to Figure 7, it can be seen that in Example 4, the change in light transmittance is the fastest and the discoloration speed is the best.

[0152]

[0153] Experimental Example: Calculating Color Efficiency

[0154] The discoloration efficiency was measured using the discoloration efficiency calculation formula above for Examples 3 to 5 and Comparative Examples 3 to 4, and the results are shown in Table 2 and Fig. 8.

[0155] Ionic conductivity (mS / cm)T c,max (%)ΔT max (%)t c,90% (s)t b,90% (s)η (cm 2 / C) Comparative Example 30.214360.699.31325162.13 Comparative Example 40.554770.199.71121184.93 Exemplary Example 30.587610.599.61019197.9 Exemplary Example 40.654620.699.4916209.01 Exemplary Example 50.614840.199.81020201.07

[0156]

[0157] Referring to Table 2 and Figure 8, it can be seen that the discoloration efficiency of Example 4 is the best.

[0158]

[0159] The present invention is not limited to the above-described embodiments and the attached drawings, but is intended to be defined by the appended claims. Therefore, those skilled in the art will appreciate that various substitutions, modifications, and alterations may be made without departing from the technical spirit of the present invention as defined in the claims, and such modifications are also within the scope of the present invention.

[0160]

Claims

1. Polymer resin; Discoloring substances and Contains plasticizers, The above plasticizer is a primary plasticizer and propylene carbonate (PC), or a primary plasticizer, propylene carbonate (PC) and ethylene carbonate (EC). Electrochromic device composition.

2. In paragraph 1, If the above plasticizer is a main plasticizer and propylene carbonate, The above propylene carbonate is included in an amount of 3 to 11 wt% based on the weight of the main plasticizer. Electrochromic device composition.

3. In paragraph 1, When the above plasticizer is a main plasticizer, propylene carbonate and ethylene carbonate, The above propylene carbonate is contained in an amount of 2 to 8 wt% based on the weight of the main plasticizer, The above ethylene carbonate is included in an amount of 2 to 8 wt% based on the weight of the main plasticizer. Electrochromic device composition.

4. In paragraph 1, If the above plasticizer is a main plasticizer and propylene carbonate, The above propylene carbonate is contained in an amount of 35 to 85 wt% based on the weight of the polymer resin. Electrochromic device composition.

5. In paragraph 1, When the above plasticizer is a main plasticizer, propylene carbonate and ethylene carbonate, The above propylene carbonate is contained in an amount of 25 to 75 wt% based on the weight of the polymer resin, The above ethylene carbonate is contained in an amount of 25 to 75 wt% based on the weight of the polymer resin. Electrochromic device composition.

6. In paragraph 1, When the above plasticizer is a main plasticizer, propylene carbonate and ethylene carbonate, The weight ratio of the above propylene carbonate and ethylene carbonate is 3:1 to 1:

3. Electrochromic device composition.

7. In paragraph 1, The above-mentioned main ingredient is dibutyl adipate (DBA). Electrochromic device composition.

8. A step of preparing a mixture by dissolving a polymer resin in a solvent; A step of adding a plasticizer to the above mixture, and Comprising a step of adding a discoloring substance to the above mixture, The above plasticizer is a primary plasticizer and propylene carbonate (PC), or a primary plasticizer, propylene carbonate (PC) and ethylene carbonate (EC). A method for manufacturing an electrochromic material.

9. Contains an electrochromic element layer, The above electrochromic element layer is manufactured by drying an electrochromic element composition containing a polymer resin, a discoloring material, and a plasticizer. The above plasticizer is a primary plasticizer and propylene carbonate (PC), or a primary plasticizer, propylene carbonate (PC) and ethylene carbonate (EC). Electrochromic device.

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