TWI376394B - Polyimide film - Google Patents

Description

1376394 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a colorless and transparent polyalkylene amine film. [Prior Art] 5 In general, polyiminamide (η) resin is related to high heat resistant resin obtained by ring closure and dehydration reaction of polylysine at high temperature, and polyamine acid is transmitted through aromatic The acid anhydride is obtained by solution polymerization of an aromatic diamine or an aromatic diisocyanate. In the preparation of the polyamidamide resin, the aromatic dianhydride includes, for example, pyromellitic dianhydride (PMDA) or bismuth diacid dianhydride 10 (BPDA); and the aromatic diamine includes, for example, diphenylamine oxide. (〇DA), p-PDA (p-PDA), m-phenylenediamine (m_pDA), decylene diphenylamine (MD A), and diaminophenyl hexa-propyl acetate (HFD A). It is used in various fields because it has excellent properties such as heat resistance, oxidation resistance, radiation resistance, low temperature resistance and chemical resistance because it is insoluble, difficult to refine, and has high heat resistance. It includes advanced heat-resistant materials such as automotive materials, aerospace materials or aerospace materials, and electronic materials such as insulating coating agents, insulating films, semiconductors, or electrode protective films for TFT_LCD. Recently, polyamidamide resins have been used as display materials, such as mixing conductive fillers with polymers, or coating conductive coatings on the surface of polymer matte, forming optical fibers or liquid crystal alignment layers, and being transparent. Electrode film. However, the high aromatic ring density of the polyamidene resin interacts with charge transfer to cause it to become brown or yellow, so as to annoyingly reduce the light transmittance of the visible light. The yellow or brown color of the polyamide resin makes it difficult to apply in the field requiring transparency of 6 1376394. In order to solve these problems, many methods for purifying monomers and high-purity solvents for polymerization have been realized, but the improvement effect on light transmittance is not large. U.S. Patent No. 5,053,480 discloses a process for replacing an aromatic dianhydride with an alicyclic dianhydride in five parts. Although this method improves the transparency and color of the liquid phase or the film phase compared with the purification method, it is still limited in terms of improving the light transmittance, and thus the high light transmittance cannot be achieved, and the thermal and mechanical properties thereof are also Getting worse. The preparations are described in U.S. Patent Nos. 4,595,548, 4, 601, 036, 4, 458, 024, s, 4, 4, 895, 972, 5, 218, 083, 5, 093, 453, 5, 218, 017, 5, 367, 046, 5, 338, 826, 5, 968, 626, and 6, 232, 284, and in Korean Patent Publication No. 2003-0009437. Polyimide with a novel structure improves light transmittance and color transparency in a range where thermal properties are not significantly lowered, mainly using a linking group having, for example, -〇-, -S〇2· or CH2·, I5 A bent structure caused by a m-position connection without a p~P〇sition connection, or an aromatic dianhydride and an aromatic diamine monomer having a substituent such as a -CF3. However, such polyamines have been found to be insufficient for use in semiconductor insulating films, TFT-LCD insulating films, electrode films, and flexible display substrates in terms of mechanical properties, yellowness index, and visible light transmittance. 20 SUMMARY OF THE INVENTION Accordingly, the present invention provides a polyimide film which is colorless and transparent and exhibits excellent properties including mechanical properties and thermal stability. According to a preferred embodiment of the present invention, there is provided an aromatic diacid 7 1376394

A poly-branched amine film made of a polymer of a t-amine, which is 5. On the basis of the film thickness of 100 Å, the ultraviolet light spectrophotometer was used to measure the complex ' at a wavelength of 380 to · nm, and had an average transmittance equal to or greater than (4) and a yellow index equal to or less than 15. - ίο The polyimide film according to this embodiment is measured by a UV spectrophotometer based on a film thickness of 5 〇 to 1 〇〇, and may have a wavelength equal to a wavelength of 780 rnn. Or an average light transmittance of more than 88%, which may have a light transmittance equal to or greater than 88% at a wavelength of 550 nm, and a light transmittance equal to or greater than 85% at a wavelength of 5 〇〇 nm, and When the wavelength is 42 〇 nm, it may have a light transmittance equal to or greater than 50%. The polyimide film according to this embodiment may have an optical density of less than 50 at a wavelength of 420 nm based on a film thickness of 5 Å to 1 Å μη. In the polyimine membrane according to this embodiment, the aromatic diacid liver may comprise a compound or a mixture of two or more compounds selected from the group consisting of 2,2-bis (3,4- Dicarboxyphenyl) hexafluoropropane dianhydride (6-FDA), 4-(2,5-dioxotetrahydrofuran-3-yl)- 1,2,3,4-tetrahydronaphthalene-1,2- bis-acid anhydride (4-(2,5-dioxotetrahydrofuran-3-yl)-l,2,3,4-tetrahydronaphthalene-l,2-dicarboxylic anhydride , TDA) and 2〇4,4'-(4,4'-isopropenyldiphenoxy)bis(phthalic anhydride) (4,45-(4,45-isopropylidenediphenoxy)bis(phthalic anhydride) , HBDA). In the polyamidamine film according to this embodiment, the aromatic diamine may comprise a compound or a mixture of two or more compounds selected from the group consisting of oxydianiline (ODA), 1, 3-bis(3-aminophenoxy)benzene (APB-133), 1,3-bis(4-aminophenoxy)benzene (1,3) -bis(4-aminophenoxy)benzene, APB-134), 1,4-bis(4-aminophenoxy)benzene 5 (l,4-bis(4-aminophenoxy)benzene, APB-144), double ( Bis (3-aminophenyl)sulfone, 3-DDS, bis(4-aminophenyl)sulfone, 4-DDS, 2,2' - bis(trifluoromethyl)-4,4'-diaminobiphenyl (2,2'-1^(£111〇1*〇1116111>^)-4,4'-diaminobiphenyl,2,2 '-TFDB), 3,3,-bis(trifluoromethyl)-4,4'-1〇diaminobiphenyl (3,3'-bis(trifluoromethyl)-4,4'-diaminobiphenyl, 3, 3'-TFDB), 2,2'-bis[4 (4-aminophenoxy)phenyl]hexafluoropropane (2,2,-bis[4(4-aminophenoxy)phenyl]hexafluoropropane, 4-BD AF), 2,2'-bis[3 (3-aminophenoxy) Phenyl]hexafluoropropane (2,2,-bis[3(3-aminophenoxy)phenyl]hexafluoropropane, 3-BD 15 AF), 4,4'-bis(3-aminophenoxy)diphenylphosphonium (4,4,-bis(3-aminophenoxy)diphenylsulfone, DBSDA) and 2,2-bis[4-(4-aminophenoxy)phenyl]propane (2,2-bis[4-(4- Aminophenoxy)phenyl]propane, 6-HMDA). The polyamidamine film according to the third embodiment may have a dielectric constant of 3.0 or less at a frequency of 50 to 100 μm based on the film thickness of 50 to 100 μm. The polyamidamine film according to the third embodiment may have an average coefficient of thermal expansion (CTE) of 50 ppm or less at 50 to 200 ° C based on a film thickness of 50 to 100 μm. The polyimide film according to the third embodiment may have a modulus equal to or greater than 3.0 GPa based on a film thickness of 50 to 100 μm. The polyamidamine film according to the third embodiment may have a 50% ultraviolet cut-off wavelength of 50% or less based on the film thickness of 50 to 100 μm. The present invention can provide a polyimide resin which is colorless and transparent and has excellent properties including mechanical properties and thermal stability, and thus can be used in various fields including semiconductor insulating film, TFT_LCD insulating film, passivation film, and liquid crystal alignment layer. Optical communication materials, protective films for solar cells, and flexible display substrates. The present invention also provides a liquid crystal alignment layer and a polyimide film using the polyamidamine resin. [Simple description of the drawing] The first figure is a 15 piece of the polyimide film of Example 1 placed on a piece of paper; and the second picture is the film of the poly-branched amine of Comparative Example 1 placed on a piece of paper. photo. [Embodiment] * The present invention will be described in detail later. The polyamidamine film of the present invention is a film of a poly-anisole resin prepared from a copolymer of a diamine and a dianhydride, particularly a colorless transparent polyimide film. The polyamidamine film prepared by the invention has a film thickness of 10 1376394 of 50 to 100 μm as a reference, and the light transmittance of the external light is measured, and when it reaches nm, it has an average of 85% or more. Light transmittance, and long and ^ yellow index equal to or less than 15.

10

Further, the polyacrylamide film has a light transmittance measured by an ultraviolet spectrophotometer based on a film thickness of 5 Å to 1 〇〇 μηη, and preferably has a wavelength equal to or greater than 88 at a wavelength of 551 to · nm. The average light transmittance of %, when the wavelength is 550 nm, preferably has a light transmittance equal to or greater than 88% at a wavelength of +500 nm, preferably has a light transmittance equal to or greater than 85% and a wavelength 420. In the case of nm, it is preferred to have a light transmittance equal to or greater than 5%. The polyimide film of the present invention which conforms to the aforementioned light transmittance and yellow index can be applied to a conventional yellow-colored polyimide film which is difficult to apply and has high transparency requirements, including a protective film of TFT_LCD or a diffusion plate. Interlayer with a coating such as a TFT-LCD, a gate insulating layer (〇6)

Insulator) and liquid crystal alignment layer. When transparent polyimide is applied to the liquid crystal alignment layer, it contributes to the improvement of porosity, so that a TFT-LCD with high contrast can be manufactured, and transparent polyimide can also be used for a flexible display substrate (Flexible Display Substrate) ). The polyiminium film of the present invention may have an optical density of less than 50 at a wavelength of 420 nm based on a film thickness of 50 to 100 μm. A polyimide film conforming to the aforementioned optical density and light transmittance lowers the refractive index used to indicate the degree of scattering of light penetrating the film, so that the color, size or position of the target that penetrates the film The distortion rate is reduced, and the birefringence and retardation are also reduced. Therefore, the polyamidamine film of the present invention can be applied to a field requiring transparency. 11 20 1376394 For the purpose of this invention, the aromatic dianhydride used in the present invention is not particularly limited, but includes a compound or a mixture of two or more compounds selected from 2,2_bis (3, 4-dicarboxyphenyl)hexafluoropropane: anhydride (6-FDA), and 4-(2,5-dioxotetrahydrofuran-3-yl)4,234-5 tetradecylnaphthalene_1,2~·dicarboxylic anhydride (TDA) and 4,4,_(4,4,-isopropenyldiphenoxy)bis(phthalic anhydride) (HBDA). And the aromatic diamine used in the present invention is not particularly limited, but includes a compound or a mixture of two or more compounds selected from the group consisting of oxidized diphenylamine (ODA) and 1,3-double (3). -aminophenoxy) stupid (APB-133), 1,3-bis(4-aminophenoxy)benzene (APB_134), anthracene, 4-bis(4-aminophenoxy)benzene ( APB-144), bis(3-aminophenyl)^(3-DDS), bis(4-aminophenyloxy)sulfone (4-DDS), 2,2'-bis(trifluoromethyl) -4,4'-diaminobiphenyl (2,2'-butane 03), 3,3,-bis(trifluoromethyl)-4,4'-diaminobiphenyl (3,3' -TFDB), 2,2'-bis[4 (4-aminophenoxy) 15 phenyl]hexafluoropropane (4-BDAF), 2,2'-bis[3 (3-aminophenoxy) Phenyl]hexafluoropropane (3-BDAF), 4,4'-bis(3-aminophenoxy)diphenylphosphonium (DBSDA) and 2,2-bis[4-(4-aminobenzene) Oxy)phenyl]propane (6-HMDA). The diacid needle and the diamine are dissolved in an organic solvent in an equivalent molar amount, and then reacted 20 to prepare a poly-branched acid solution. The reaction conditions are not particularly limited, but include a reaction temperature of minus 20 to 80 ° C and a reaction time of 2 to 48 hours. Further, the reaction is preferably carried out under an inert gas atmosphere of argon or nitrogen. The organic solvent used for the solution polymerization of the monomer is not particularly limited as long as the polylysine can be dissolved therein. In the generally known reaction solvent, one or more polar solvents selected from the group consisting of m-cresol, hydrazine-methyl-2_πpyrrolidone (oxime), dimercaptomannamine (DMF), and two are used. Methylacetamide (DMAc), dimethyl sulfoxide (DMSO), acetone, and diethyl 5-acetate. Further, a low boiling point solvent such as tetrahydrofuran (THF) or chloroform or a low absorption solvent such as γ-butyrolactone may also be used.

The amount of the organic solvent to be used is not particularly limited, and in order to obtain a polyamic acid solution having an appropriate molecular weight and viscosity, the organic solvent is preferably used in an amount of up to 95% by weight based on the total amount of the polyamic acid solution. It is preferably from 70 to 90% by weight. 15 20 Calcium, Calcium Phosphate and Mica In addition, when the polyamidomethine membrane is made of polylysine solution, &lt;addition of the amine to increase the nature of the bribe, package (four) dynamic, thermal conductivity Sex, conductivity and corona resistance. The filler is not particularly limited, but specific examples thereof include dioxy-cut, titanium oxide 'layered dioxide dioxide dream, nano carbon tube, oxidized sulphur, nitriding dream, nitriding, sulphate nitrogen filler particle size can be modified The nature of the film and the type of filler added vary from 'four' (iv). The average particle size of the filler is in the range of 5 Torr, more preferably in the range of 至 to 25 qing in the range of 0.01 to 10 μη. Here 轻易 Easily: effectively modified, and can also exhibit a good surface = film; electrical and mechanical properties - the amount of filler can be used depending on the nature of the film to be modified, but no special restrictions ^! The granules of the 〇〇 曰 曰 科 科 科 科 科 : : : : : : : 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿There is no restriction on the addition method of 5 t, but for example, it is included in: after adding or adding the filler to the heteroamine solution, after completing the polymerization of the poly-solution, using the tri-mill to mix the filler Form: 疋s The dispersed solution with filler is mixed with the warm solution of polyamine. The method for producing the polyaramine film by using the polyamic acid solution obtained in this manner is not particularly limited, and any known method for use can be employed. The amination of the polyunion includes, for example, thermal amidation and chemical amination, wherein chemical amidation is particularly effective. Chemically brewed amidoxime is added by adding a dehydrating agent, including acid fields, such as acetic acid needles, and a chitinizing catalyst, including tertiary amines, such as isoindole, P-methyl pi-bite, or tonidine. It is carried out in a polyamic acid solution. The chemical imidization can be carried out together with the thermal amidation, and the heating conditions may vary depending on the type of the polyamic acid solution and the thickness of the film. The poly-proline solution on the substrate is heated at 80 to 200 ° C, preferably at 1 to 18 ° C, to partially harden and dry the activated dehydrating agent and the amidoxime catalyst. It is not possible to obtain a gelatinized polyacrylic acid film, to separate the polyamic acid film from the substrate, and to be in the range of 200 to 400. The film in the gel state is heated under the arm for 5 to 400 seconds to obtain a polyimide film. The thickness of the polyimide film obtained by the film is not particularly limited, but the film thickness is preferably in the range of 10 to 250 μm, more preferably in the range of 25 to 150 μm, in view of the field of application. Inside. The polyamidamine film of the present invention has a dielectric constant at or below 3 1376394 at 1 GHz and thus can be used as a semiconductor passivation film. The polyamidamine film of the present invention is at -50 to 2 Torr. (: when having an average coefficient of thermal expansion equal to or less than 50 ppm. If the average coefficient of thermal expansion exceeds 5 〇 ppm, when a polyimide film is applied to a film on which a thin tantalum transistor (TFT) is placed on a thin film 5 In the TFT ARRAY process, the polyimide film may shrink or swell with different process temperatures, resulting in failure to achieve alignment in the electrode replacement process. In addition, the film cannot be kept flat, and thus may be rolled. Therefore, the TFT process may be performed more accurately when the coefficient of thermal expansion is reduced. 10 The polyacrylamide film of the present invention has a modulus equal to or greater than 3.0 GPa. In this example, a polyimide film It can be more easily applied to the Roll to Roll process of flexible display substrates. When polyimide film is used as the base film of flexible display and soft copper foil substrate (FCCL), The roll pressing process is carried out. At this time, since the film is subjected to tension when it is wound by the drum and released from the drum, the film having a modulus of less than 3 〇Gpa may be broken. According to the use of the ultraviolet spectrophotometer. For the light rate measurement, the polyamidamine film of the present invention has a cutoff wavelength of 50% or less of 400 nm. Therefore, the polyimide film of the present invention can be used as a 20 骐 for solar cells. The examples are intended to further understand the present invention, but the examples are not to be construed as limiting the invention. <Example 1> When nitrogen is passed through a 100 mL equipped with a stirrer, a nitrogen inlet, a dropping funnel, a 15 1376394 temperature regulator, and a condenser In a three-neck (3-Neck) round bottom flask reaction apparatus, 32.4623 g of N,N-dimethylacetamide (DMAc) was added to the round bottom flask, and the temperature of the reaction apparatus was lowered to 〇. Then, dissolve 4.1051 g (0.01 mol) of 6-HMDA. Keep this solution at 5 ° C. 3.097 g (0.007 mol) of 6-FDA and 0.90078 g (0.003 mol) TDA was added to the solution and the mixture was stirred for 1 hour until the 6-FDA and TDA were completely dissolved. The solid content of this solution was 2% by weight (wt%). The obtained solution was stirred for 8 hours at room temperature. 'With a viscosity of 2200 cps at 23 ° C A solution of the amino acid. 10 Thereafter, a poly(lanine) solution having a thickness of 500 to 1 μm was applied to the glass substrate using a doctor blade (Doct〇r Blade), and dried at a temperature of 4 〇〇c in a vacuum oven. After 1 hour, and dried at a temperature of 60 ° (:: 2 hours) to produce a Self Standing Film. Then, the film was allowed to heat at a temperature of 5 ° C per minute in a high temperature oven at 8 ° C. C was hardened at 3 hours and 15 hours, hardened for 1 hour, hardened at 200 1 for 1 hour, and hardened at 3 〇〇〇C for 30 minutes to produce a poly-aniline film having a thickness of 5 μm and loo. &lt;Example 2&gt; As in Example 1, 4.1051 g (〇.〇1 mol) of 6_HMDA was dissolved in 31.3106 g of DMAc, and this solution was maintained at a temperature of 〇〇c. 2.2215 g (0.005 mol) of 6-FDA and 1.5013 g (0.005 mol) of TDA were added to the solution sequentially, and the solution was stirred for 1 hour until the 6-FDA and TDA were completely dissolved. The solid content of the solution was 2% by weight (wt%). Then, the obtained solution was stirred at room temperature for 8 hours, 16 1376394 to give a poly-branched acid solution having a viscosity of 2000 cps at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 3&gt; As in Example 1 '4·1051 g (〇·〇1 mol), 6-HMDA was dissolved in 30.15868 g of DMAc, and this solution was maintained at a temperature of 〇〇c. Add 1.11275 grams (0.003 moles) of 6-FDA and 2.10182 grams (0.007 moles) of TDA to the solution and stir the solution for 1 hour until the 6-FDA and TDA are completely dissolved. The solids content of the solution is 2. 〇 Weight percent (wt%). Then, the solution was stirred at room temperature for 8 hours to give a polyamic acid solution having a viscosity of 1800 cps at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 4&gt; As in Example 1 ' 2.87357 g (0.007 mol) of 6-HMDA was dissolved in 30.5 丨 58 g of DMAc, and then 449. 7449 g (0.003 mol) 15 of 3_DDS was added to 'and completely dissolved. 3.1097 g (0.007 mol) of 6-FDA and 0.90078 g (0.003 mol) of TDA were sequentially added to the solution, and the solution was stirred for 1 hour until the 6-FDA and TDA were completely dissolved. The solid content of the solution was 20 weight. Percentage (wt%). Then, the obtained solution was stirred at room temperature for 8 hours to produce a polylysine solution having a viscosity of 2000 cps at 230 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 5&gt; As in Example 1 ' 2.87357 g (0.007 mol) of 6-HMDA was dissolved in 30.5158 g of DMAc, and 0.7449 g (0.003 mol) of 17_DDS was added to the solution and completely dissolved. . 3. Shunke (0.007 mol) of 6-FDA and 0.9 g (_mole) dishes were sequentially added to the solution, and the solution was mixed for 1 hour until the 6 FDA and the dish were completely dissolved. The solids content of the solution was 2% by weight (wt%). Then, 5 at room temperature, the solution was mixed with 8 (four) to produce a polylysine solution having a viscosity of 2000 cps at the time of scratching. Thereafter, a poly-aniline film was produced in the same manner as in Example i. &lt;Example 6&gt; A 3D system of 2,2,_TFDB and 1〇0.7449 g (0.003 mol) as in Example 1' 2.24161 g (〇.007 mol) was dissolved in 98796 g of DMAc. Add 3 1〇97 g (〇〇〇7 摩尔) of 6 FDA and 〇9〇〇78 g^0'003 mol of TDA to the solution in sequence, and mix the solution with 1 J 犄 stomach until 6 - FDA and TDA are completely dissolved. The solid content of the solution is 2% by weight of the percentage (wt%, then, at room temperature, the solution is dropped to 8 J to produce a polylysine solution having a viscosity of 2000 cps at 23 T. Thereafter, The polyimide film was produced in the manner of Example 1. &lt;Example 7&gt; As in the example, 2.24161 g (0.007 mol) of 2,2,-TFDB and 〇'7449 g (0.003 mol) of 4-DDS were dissolved. In 27.98790 g of 2 〇 DMAC, 3.1097 g (0.007 mol) of 6-FDA and 0.90078 g (0.003 mol) of tda were sequentially added to the solution, and the solution was mixed for 1 hour until 6-FDA and The TDA was completely dissolved. The solids content of the solution was 20% by weight (wt%). Then, the solution was stirred at room temperature to give a solution of urethane at a viscosity of 2000 cps at 23 °C. Thereafter, a polyamidamine film was produced in the same manner as in Example 1, &lt;Example 8&gt; As in Example 1, 3.62292 g (〇·007 Moel) of 4_BDAF was dissolved in 33.5386 g of DMAc, and then 〇7449 g (〇〇〇3mol) 5 of 3_DDSM into solution' and make it completely dissolved. Will be 3.1097 g (0.007 mol) 6-FDA and 0.90078 g (0.003 mol) of TDA were added sequentially; in the solution, the solution was stirred for 1 hour until 6-fda was completely dissolved with TDA. The solids content of the solution was 20 weight percent (wt%). Then, the solution was stirred at room temperature for 8 hours to give a polyamine solvent solution having a viscosity (1) of 2200 cps at 23 ° C. Thereafter, a polyimide film was produced in the same manner as in Example 1. Example 9&gt; As in Example 1 ' 3.62922 g (0.007 mol) of 4-BDAF was dissolved in 33.5386 g of DMAc, and then 0 7449 g (〇.〇〇3 mol) of 4-DDS was added to the solution. And completely dissolve it. Add 3 1 〇 97 g (〇〇〇 7 摩尔) of 6-FDA and 0.90078 g (ο·mol) of TDA to the solution, and stir the solution for 丨 hours until 6 _FDA Completely dissolved with tda. The solid content of the solution was 2Q weight percent (wt%). Then, the solution was allowed to swim for 8 hours at room temperature to produce a polyaminic acid solution having a viscosity of 2100 cps at 23T. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 1〇&gt; As Example 1, 2.04 631 g (0.007 mol) of ΑΡΒ·133 and 0.7449 g (0.003 mol) of 3_DDS were completely dissolved in DMAc of 27.20696 1376394 g. 3.10975 grams (0.007 moles) of 6-FDA and 0.90078 grams (0.003 moles) of TDA were sequentially added to the solution, and the obtained solution was stirred for 1 hour until the 6-FDA and TDA were completely dissolved. The solids of the solution contained 20% by weight (wfo/o). Then, the solution was stirred at room temperature for 5 hours to give 23. At a time, the viscosity is 19〇〇卬3. Poly-proline solution. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 11&gt; As in Example 1, 2.04631 g (0.007 mol) of APB-133 and 1 〇 0.7449 g (0.003 mol) of 4_DDS were completely dissolved in 27 2 696 g of DMAC. 3.10975 grams (0.007 moles) of 6_FDA and 0.90078 grams (0.003 moles) of TDA were added sequentially to the solution and the mixture was stirred for 1 hour until 6_FDA and TDA were completely dissolved. The solid content of the obtained solution was 20% by weight (wt%). Then, the solution was stirred for 8 hours under room temperature I5 to give 23. &lt;:, a polyaminic acid solution having a viscosity of i95 〇 cps. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 12&gt; As in Example 1, 3.2023 g (0.01 mol) of 2,2,_TFDB was completely dissolved in 30,986 g of DMAc. This solution was maintained at a temperature of 〇τ. 3.64355 g (0.007 mol) of 6-HBDA and 0.90078 g (0.003 mol) of TDA were sequentially added to the solution, and the mixture was stirred for two hours until 6-HBDA and TDA were completely dissolved. The solid content of the obtained solution was 20% by weight (wt%). Then, the solution of 20 1376394 was stirred at room temperature for 8 hours to produce a polyaminic acid solution having a viscosity of 2 〇〇〇 cps at 23 Torr. . Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 13&gt; 5 As in Example 1, 2.48 g (0.01 mol) of 4-DDS was dissolved in 28.1093 g of DMAc, and the solution was maintained at the temperature of 〇〇c. 3.64355 g (0.007 mol) of 6-HBDA and 0.90078 g (0.003 mol) of TDA were added to the solution sequentially, and the solution was stirred for a few hours until 6-HBDA and TDA were completely dissolved. The solids content of the solution was 2% by weight and 1% by weight (wt%). Then, the solution was stirred at room temperature for 8 hours to give a polyamic acid solution having a viscosity of 1800 cps at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 14&gt; As in the example, 5.1846 g (〇.1 mol) of 4-BDAF was dissolved in 38.9157 g of DMAc, and the solution was maintained at the temperature. 3.64355 g (0.007 mol) of 6-HBDA and 0.90078 g (0.003 mol) of TDA were added to the solution sequentially, and the solution was stirred for a few hours until 6-HBDA and TDA were completely dissolved. The solids content of the solution was 2% by weight (wt ° / 〇). Then, the solution was stirred at room temperature for 8 hours to give a polyacrylic acid solution having a viscosity of 2 〇〇〇 CpS at 23 ° C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 15&gt; As in Example 1, 2.22161 g (0·007 mol) of 2,2,-TFDB and 0.7449 g (0.003 mol) of 4-DDS were completely dissolved in DMAc of 30 3628 21 1376394 g ❶ Keep the solution at the same temperature. 3 6435 g (0.007 mol) of 6_HBDA and 〇.96 〇 69 g (10) 〇 3 mol of TDA were sequentially added to the solution and stirred for 1 hour until 6 ηβ〇α was completely dissolved. The solid content of the solution was 20 weight percent (wt%) / then, 5, the solution was mixed for 8 hours under temperature conditions to give a polyamine solution having a viscosity of 1700 cps at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 16&gt; As in Example 1, 3.62922 g (0.007 mol) of 3-BDAF and 10 0.7449 g (0.003 mol) of 4-DDS were completely dissolved in 35.91324 g of DMAc. The solution is maintained at the temperature of 〇〇c. 3 6435 g (0.007 mol) of 6-HBDA and 0.96069 g (0.003 mol) of TDA were sequentially added to the solution and stirred for 1 hour until 6_HBDA and TDA were completely dissolved. The solid content of the solution was 20 weight percent (wt%). Then, I5 was mixed for 8 hours at room temperature to give at 23. (:, a polyamic acid solution having a viscosity of 1700 cps. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 17&gt; As in Example 1 ' 2.24161 g (0.007 m) 2, 2,-TFDB and 20 1.5 5 5 3 8 g (0.003 mol) of 3-BDAF were added and completely dissolved in 33.60472 g of DMAc. The solution was kept at 〇. (: temperature. 3.6435 g (0.007 6-HBDA of Mohr and 0.96069 g (0.003 mol) of TDA were added to the solution sequentially and allowed to mix for 1 hour until the solid content of 6_hbda and TDA was completely dissolved. The solid content of the solution was 2% by weight 22 (Wt%) Then, the solution was stirred at room temperature for 8 hours to produce a solution of 18 〇〇CpS of poly-araminic acid at 23 C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Comparative Example 1&gt; 5 As in Example 1, 5.1846 g (0.01 mol) of 4-BDAF was dissolved in 38.5084 g of DMAc, followed by 4.4425 g (0.01 mol) of 6-FDA. 1 hour until 6_FDA is completely dissolved. The solid content of the solution is 20 weight percent (wt%). Then The solution was stirred at room temperature for 8 hours to give a polyamine solvent solution having a viscosity of 1300 cps 10 (hereinafter, a polyimide film was produced in the same manner as in Example 1 and obtained. The film thicknesses were 25 μm, 50 μm and 1 分别, respectively. &lt;Comparative Example 2&gt; As in Example 1 '2.9233 g (0.01 mol) of ΑΡΒ-133 溶 15 solution in 29.482 g of DMAc, followed by 4.4425 Gram (0.01 mol) of 6-FDA was added. The solution was stirred for 1 hour until the 6_FDA was completely dissolved. The solid content of the solution was 20 weight percent (wt%). Then, the solution was stirred at room temperature for 8 hours. A polyamic acid solution having a viscosity of 1200 cps was produced at 23 ° C. 20 Thereafter, a polyimide film was produced in the same manner as in Comparative Example 1. &lt;Comparative Example 3&gt; As Example 1 '2.4830 g (0.01 The 3D DDS of Mohr was dissolved in 27.702 g of DMAc, followed by 4.4425 g of 6-FDA. The solution was stirred for 1 hour until 6_FDA was completely dissolved. 23 1376394 The solid content of the solution was 2 〇 Fan τ, will dissolve under the pieces _ mix for 8 hours, ^ ^ ratio (Wt%), #: After 'at a room temperature strip of poly-araminic acid solution. At 23 C, the viscosity of 1300 cps 1 square polyalkylene amine film. As an example, 2.4830 g of rnm is used in 27.7 〇 2 g of DMAct technology (Mohr) 4_DDS is dissolved ίο 6 times. The solution _ f: T5 g (〇.〇if:) solution has a solid content of 2G. Weight 100, to 6_FDA&quot; ° full 'gluten. Under the pieces will dissolve for 8 hours, New's at room temperature strip of poly-broncine solution. Produced at 23 C, the viscosity is ah, then used The polyimide film was produced in the same manner as in Example 1. <Comparative Example 5> As in the example, 2.0024 g (〇.〇1 mole) of 3,3,-〇da is dissolved in DMAc of 25.7796 g. Then, 4 4425 g (〇〇1 mol) of 6-FDA was added, and the obtained solution was stirred for 1 hour until 6_fda; completely dissolved. The solid content of the solution was 20 weight percent (wt%). Then, The solution was scrambled for 8 hours at room temperature to produce a poly-aracine solution having a viscosity of 1600 cps at 23 ° C. 20 Thereafter, a polyimide film was produced in the same manner as in Comparative Example 1. &lt;Comparative Example 6&gt;

As in Example 1, 2.0024 g (〇.〇1 mol) of 4,4,-〇DA was dissolved in 16.7344 g of DMAc, followed by 2.1812 g (〇.〇1 mol) of PMDA, and will be obtained The solution was mixed for 1 hour until PMDA 24 1376394 was completely dissolved. The solid content of the solution was 20 weight percent (wt%). Then, the solution was stirred at room temperature for 8 hours to give a polyaminic acid solution having a viscosity of 2500 p〇ise at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Comparative Example 1. 5 The properties of the polyacrylamide membranes prepared by the above examples and comparative examples were measured in the following manner. The results are summarized in Tables 1 through 4 below. (1) Light transmittance and 50% cut-off wavelength The ultraviolet light spectrophotometer (Varian Technology Co., Ltd., Varian; model Cary 100) was used to measure the visible light transmittance rate and 50% of each polyacrylamide film. Cutoff wavelength. The polyimide film of Example 1 and Comparative Example 6 having a film thickness of 50 μm was placed on a sheet of paper printed with yellow characters and lines, and photographed. The results are shown in the first and second figures. (2) Yellow index 15 The yellow index is measured in accordance with the ASTM E313 standard. (3) Optical density (OD) The optical density is calculated according to the following equation 1: Equation 1 = log ι〇Γ [ log l0(~?·)] where / is the thickness of the film, and 4 is at the wavelength χ The absorbance at the time, f is the light transmittance 'is the incident light intensity, and / is the transmitted light intensity. (4) Modulus Using Instron's universal testing machine (universai 25 1376394)

Testing Machine), Model Model 1000, measures the modulus according to JIS K 6301. (5) Glass transition temperature (Tg) The glass transition temperature was measured using a scanning thermal differential analyzer (DSC, ΤΑ instrument, model Q200), 5. (6) Thermal expansion coefficient (CTE) The thermal expansion coefficient was measured at 50 to 200 °C using a thermomechanical analyzer (ΤΜΑ, ΤΑ instrument, model Q400) according to the thermomechanical analysis method (TMA-Method). 1 〇 (7) Dielectric constant The dielectric constant is measured in accordance with ASTM D150. 【Table 1】

Composition Moerbi Film Thickness (μιη) Light Transmittance Optical Density 380 nm to 780 nm 551 nm to 780 nm 550 nm 500 nm 420 nm 550 nm 500 nm 420 nm Example 1 6-FDA+TDA/6-HMDA 7: 3:10 50 88.2 90.0 89.8 89.3 60.1 9.34 9.82 44.25 2 6-FDA+TDA/6-HMDA 5:5:10 50 88.0 89.9 89.7 89.3 58.9 9.44 9.83 45.98 3 6-FDA+TDA/6-HMDA 3:7: 10 50 87.8 89.5 89.5 88.9 58.0 9.64 10.21 47.31 4 6-FDA+TDA/ 6-HMDA+3-DDS 7:3:7:3 50 87.0 88.5 88.2 87.2 57.6 10.91 11.89 47.92 5 6-FDA+TDA/ 6-HMDA +4-DDS 7:3:7:3 50 86.7 88.5 88.3 87.2 57.7 10.80 11.89 47.76 6 6-FDA+TDA/ 2,2,-TFDB+3-DDS 7:3:7:3 50 88.5 90.3 89.9 89.2 71.5 9.25 9.92 29.14 7 6-FDA+TDA/ 2,2,-TFDB+4-DDS 7:3:7:3 50 88.4 90.1 89.6 89.2 70.7 9.53 9.92 30.11 8 6-FDA+TDA/ 4-BDAF+3-DDS 7:3:7:3 50 85.6 88.9 88.7 86.4 63.1 10.42 12.70 40.00 9 6-FDA+TDA/ 4-BDAF+4-DDS 7:3:7:3 50 85.7 89.0 88.8 87.4 63.8 10.32 11.70 39.04 10 6-FDA +TDA/ APB-133+3-DDS 7:3:7:3 50 87.3 89.6 89.4 89.0 75.4 9.73 10.12 24.52 26 1376394

11 6-FDA+TDA/ APB-133+4-DDS 7:3:7:3 50 86.8 88.9 88.7 88.2 75.8 10.42 10.91 24.07 12 6-HBDA+TDA/ 2,2,-TFDB 7:3:10 50 86.7 89.1 88.9 87.3 72.7 10.21 11.79 27.69 13 6-HBDA+TDA/4-DDS 7:3:10 50 87.1 89.5 89.1 87.6 74.6 10.02 11.50 25.5 14 6-HBDA+TDA; 4-BDAF 7:3:10 50 86.6 89.2 89.0 87.2 72.9 10.12 11.89 27.45 15 6-HBDA+TDA/ 2,2'-TFDB+4-DDS 7:3:7:3 50 88.4 90.1 89.6 89.2 70.7 9.53 9.92 30.11 16 6-HBDA+TDA/ 3-BDAF+4 -DDS 7:3:7:3 50 85.7 89.0 88.8 87.4 63.8 10.32 11.70 39.04 17 6-HBDA+TDA/ 2,2'-TFDB+3-BDAF 7:3:7:3 50 87.0 88.5 88.2 87.2 57.6 10.91 11.89 47.92 Example 1 6-FDA+TDA/6-HMDA 7:3:10 100 87.6 89.6 89.1 87.6 56.2 5.01 5.74 25.02 2 6-FDA+TDA/6-HMDA 5:5:10 100 87.4 89.5 89.0 87.7 54.5 5.06 5.70 26.36 3 6-FDA+TDA/6-HMDA 3:7:10 100 87.2 89.1 88.8 87.5 53.6 5.16 5.80 27.08 4 6-FDA+TDA/ 6-HMDA+3-DDS 7:3:7:3 100 86.5 88.2 88.1 86.1 53.1 5.50 6.50 27.49 5 6-FDA+TDA/ 6-HMDA+4-DDS 7:3:7:3 100 86.0 88.2 88.2 86.2 53.0 5.45 6.44 27.57 6 6-FDA+TDA/ 2,2'-TFDB+3- DDS 7:3:7:3 100 8 7.8 89.9 89.4 88.0 67.8 4.87 5.55 16.88 7 6-FDA+TDA/ 2,2,-TFDB+4-DDS 7:3:7:3 100 87.8 89.7 89.2 88.3 66.5 4.96 5.40 17.71 8 6-FDA+TDA/ 4- BDAF+3-DDS 7:3:7:3 100 85.1 88.3 88.2 85.5 59.8 5.45 6.80 22.33 9 6-FDA+TDA/ 4-BDAF+4-DDS 7:3:7:3 100 85.2 88.6 88.4 86.0 60.2 5.35 6.55 22.04 10 6-FDA+TDA/ APB-133+3-DDS 7:3:7:3 100 86.8 89.9 89.8 87.5 70.1 4.67 5.79 15.42 11 6-FDA+TDA/ APB-133+4-DDS 7:3:7 :3 100 86.0 88.7 88.3 86.7 70.3 5.40 6.20 15.30 12 6-HBDA+TDA/ 2,2,-TFDB 7:3:10 100 85.8 88.7 88.3 85.7 68.4 5.40 6.70 16.49 13 6-HBDA+TDA/ 4-DDS 7: 3:10 100 86.5 89.2 88.6 86.0 70.2 5.26 6.55 15.37 14 6-HBDA+TDA/ 4-BDAF 7:3:10 100 86.0 88.8 88.4 85.8 68.8 5.35 6.65 16.24 15 6-HBDA+TDA/ 2,2'-TFDB+ 4-DDS 7:3:7:3 100 87.8 89.7 89.2 88.3 66.5 4.96 5.40 17.71 16 6-HBDA+TDA/ 3-BDAF+4-DDS 7:3:7:3 100 85.2 88.6 88.4 86.0 60.2 5.35 6.55 22.04 17 6-HBDA+TDA/ 2,2'-TFDB+3-BDAF 7:3:7:3 100 86.5 88.2 88.1 86.1 53.1 5.50 6.50 27.49 27 1376394 [Table 2]

Light transmittance Optical density Composition Mohby film thickness (μπι) 380 nm to 551 nm to 550 500 420 550 500 420 780 nm 780 nm IIIU mil Illll mil liill 1 6-FDA/4-BDAF 10:10 25 82.8 90.0 87.2 86.0 63.1 23.79 26.20 79.98 Ratio 2 6-FDA/APB-133 10:10 25 84.4 89.3 87.8 86.0 77.3 22.60 26.20 44.72 Compared with 3 6-FDA/3-DDS 10:10 25 84.3 88.6 89.7 88.6 66.5 18.88 21.02 70.87 6-FDA/4-DDS 10:10 25 84.6 89.4 90.5 90.0 72.5 17.34 18.30 55.86 Example 5 6-FDA/3,3,-ODA 10:10 25 84.9 89.8 90.0 87.6 77.1 18.30 22.99 45.17 6 PMDA/ODA 10:10 25 56.6 85.2 73.0 35.0 0.05 54.67 182.37 1320 1 6-FDA/4-BDAF 10:10 50 82.2 89.7 86.8 85.1 60.0 12.29 14.01 44.36 Ratio 2 6-FDA/APB-133 10:10 50 83.8 88.8 87.2 84.8 73.2 11.89 14.32 27.09 3 6-FDA/3-DDS 10:10 50 83.7 88.2 89.1 87.6 63.1 10.02 11.49 39.99 Fan 4 6-FDA/4-DDS 10:10 50 83.9 89.1 90.0 89.1 69.4 9.15 10.02 31.72 Example 5 6-FDA/3, 3,-ODA 10:10 50 84.3 89.3 89.2 86.3 73.8 9.92 12.79 26.38 6 PMDA/ODA ΓΊό:ι〇50 56.0 84.5 69.2 33.1 0 31.97 9 6.03 1 6-FDA/4-BDAF 10:10 100 81.6 89.2 86.3 84.3 51.2 6.39 7.41 29.07 Ratio 2 6-FDA/APB-133 10:10 100 83.1 88.1 86.7 84.3 63.3 6.19 7.41 19.85 More than 3 6-FDA/3- DDS 10:10 100 83.1 87.8 88.5 87.0 53.5 5.30 6.04 27.16 Fan 4 6-FDA/4-DDS 10:10 100 83.2 88.8 89.5 88.6 58.6 4.81 5.25 23.21 Example 5 6-FDA/3,3,-ODA 10:10 100 83.5 88.7 88.8 85.4 62.1 5.15 6.85 20.69 6 PMDA/ODA 10:10 100 - • 1 - - - [Table 3] Composition Mohby Film Thickness (μιη) Yellow Index 50% Cutoff Wavelength (nm) Modulus (GPa) Tg (°C) CTE (ppm/°C) Dielectric constant / 1 GHz Fan i 6-FDA+TDA/6-HMDA 7:3:10 50 3.45 386 3.50 245 40 2.77 Example 2 6-FDA+TDA/6- HMDA 5:5:l〇50 3.49 386 3.42 240 42 2.79 J 6-FDA+TDA/6-HMDA 3:7:10 50 3.51 386 3.51 226 44 2.85 4 6-FDA+TDA/ 6-HMDA X3-DDS 7:3:7:3 50 3.86 388 3.34 265 46 2.9 5 6-FDA+TDA/ 6-HMDA+4-DDS 7:3:7:3 50 3.85 384 3.38 271 45 2.96 6 6-FDA+TDA/ 2 , 2,-TFDB+3-DDS 7:3:7:3 50 1.86 380 3.04 245 46 2.8 7 6-FDA+TDA/ 2,2'-TFDB+4-DDS 7:3:7:3 50 2.45 384 3.02 247 44 2.86 8 6- FDA+TDA/ 4-BDAF+3-DDS 7:3:7:3 50 6.7 394 3.05 234 48.8 2.60 28 1376394 9 6-FDA+TDA/ 4-BDAF+4-DDS 7:3:7:3 50 6.5 394 3.09 241 47.9 2.61 10 6-FDA+TDA/ APB-133+3-DDS 7:3:7:3 50 4.6 388 3.0 212 46.7 2.70 11 6-FDA+TDA/ APB-133+4-DDS 7:3 :7:3 50 4.4 396 3.0 260 46.4 2.70 12 6-HBDA+TDA/ 2,2'-TFDB 7:3:10 50 2.87 386 3.26 236 47 2.78 13 6-HBDA+TDA/4-DDS 7:3: 10 50 4.08 386 3.07 225 48 2.74 14 6-HBDA+TDA/4-BDAF 7:3:10 50 7.67 389 3.12 241 46 2.59 15 6-HBDA+TDA/ 2,2,-TFDB+4-DDS 7:3 :7:3 50 2.45 384 3.12 220 45 2.86 16 6-HBDA+TDA/ 3-BDAF+4-DDS 7:3:7:3 50 6.5 394 3.05 231 47 2.61 17 6-HBDA+TDA/ 2,25- TFDB+3-BDAF 7:3:7:3 50 3.86 388 3.06 218 46 2.9 Example 1 6-FDA+TDA/6-HMDA 7:3:10 100 4.12 389 3.52 - 38 - 2 6-FDA+TDA/6 -HMDA 5:5:10 100 4.13 389 3.46 - 39 - 3 6-FDA+TDA/6-HMDA 3:7:10 100 4.15 388 3.48 - 41 - 4 6-FDA+TDA/ 6-HMDA+3-DDS 7:3:7:3 100 4.76 390 3.39 - 42 - 5 6-FDA+TDA/ 6-HMDA+4-DDS 7:3:7:3 100 4.73 388 3.41 - 41 - 6 6-FDA+TDA/ 2 , 2'-TFDB+3-DDS 7:3:7:3 100 2.83 385 3.12 45 - 7 6-FDA+TDA/ 2,2,-TFDB+4-DDS 7:3:7:3 100 3.35 388 3.1 - 43 - 8 6-FDA+TDA/ 4-BDAF+3-DDS 7:3:7 :3 100 7.5 397 3.09 - 47.9 - 9 6-FDA+TDA/ 4-BDAF+4-DDS 7:3:7:3 100 7.5 396 3.14 - 47.1 10 6-FDA+TDA/ APB-133+3-DDS 7:3:7:3 100 5.8 393 3.12 46.0 - 11 6-FDA+TDA/ APB-133+4-DDS 7:3:7:3 100 5.7 398 3.17 - 45.6 - 12 6-HBDA+TDA/ 2, 2,-TFDB 7:3:10 100 3.67 388 3.31 - 46 13 6-HBDA+TDA/4-DDS 7:3:10 100 5.12 389 3.13 - 47 - 14 6-HBDA+TDA/4-BDAF 7:3 :10 100 8.47 391 3.21 - 46 - 15 6-HBDA+TDA/ 2,2,-TFDB+4-DDS 7:3:7:3 100 3.35 388 3.18 - 43.7 - 16 6-HBDA+TDA/ 3-BDAF +4-DDS 7:3:7:3 100 7.5 396 3.12 - 46.7 - 17 6-HBDA+TDA/ 2,2'-TFDB+3-BDAF 7:3:7:3 100 4.76 390 3.12 - 45.5 - 29 1376394 [Table 4] 1376394

Composition Mohrby Film Thickness (μιη) Yellow Index 50% Cutoff Wavelength (nm) Modulus (GPa) Tg (°C) CTE (Ppm/°C) Dielectric Constant / 1 GHz Comparative Example 1 6-FDA/4- BDAF 10:10 25 9.7 411 3.0 263 52 1 2 6-FDA/APB-133 10:10 25 5.5 395 3.05 206 47 1 2 7 3 6-FDA73-DDS 10:10 25 1.82 388 3.1 270 47 3 0 4 6 -FDA/4-DDS 10:10 25 1.68 382 3.1 310 46 3 1 b-FlJA/3,3 ,_OL)A 10:10 25 5.29 396 3.0 244 41 2.73 6 PMDA/ODA 10:10 25 91.7 514 3.0 No 26 3 3 Comparative Example 1 6-FDA/4-BDAF 10:10 50 11.2 413 3.06 51 1 2 6-FDA/APB-133 10:10 50 6.9 398 3.11 46 Π 3 6-FDA/3-DDS 10:10 50 2.95 392 3.16 45 ·3 4 6-FDA/4-DDS 10:10 50 2.81 386 3.17 • 45 1 5 6_FDA/3,3,-ODA 10:10 50 6.46 399 3.05 fi 6 PMDA/ODA 10:10 50 - - 3.12 • , Ό 25 〇 Comparative example 1 6-FDA/4-BDAF 10:10 Ιϋϋ 23.4 415 Γ3.09 _ 4g « 2 6-FDA/APB-133 10:10 Ιϋϋ ΓΤ4.2 401 3.14 44 5 3 10:10 100 4.54 396 3.20 44 〇4 6-FDA/4-DDS 10:10 100 4.26 390 3.22 Scale 446 5 6-FDA/3, 3'-ODA 10:10 100 14.26 405 3.13 30 1 6 PMDA/ODA 10:10 100 • - ~-— Polyimide film with a thickness of 50 μm and 100 μm, with an average light transmittance of 85% or more at a wavelength of 38 〇 to 78 ' 'Yellow index equals or Less than 15, and the optical density at a wavelength of 420 nm is equal to or less than 5 (as shown in the first figure, the polyimide film conforming to the aforementioned light transmittance, yellow pure and optical density, is transparent to enable placement The yellow words and lines printed on the paper below it can be seen. In the comparative example, regardless of the film thickness, there is no case where the average light transmittance at the wavelength of 380 to 780 nm in the visible light range is equal to or greater than 85%. Further, in Comparative Example 6, a polyimide film having a film thickness equal to 30 1376394 or more than 90 μm was not produced. When the poly-sub-film produced by the examples of the present invention is smaller than 働nm, and there is a opacity of η 反 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 Lai. Therefore, the melamine film of the present invention can be used as a surface protective film for solar cells. In addition, since the average thermal expansion coefficient of the polyimide film is equal to or less than 5 〇 ppm', the monthly b exhibits dimensional stability of the degree, and since it has a modulus equal to a bite of more than 3.0 GPa, it appears to be applied to the crimping ( Ron to R〇u) Film properties required for the process. Further, the polyimide film of the present invention can also be applied to a TFT process for manufacturing a flexible display substrate and a movable display, and the film has a ratio of 3.0 or less. The dielectric constant can be used as a semiconductor passivation film.

31 1376394 [Simple description of the drawings] The first picture is a photograph of the polyimide film of Example 1 placed on a piece of paper; and the second picture is the film of the polyimide film of Comparative Example 1 placed on a piece of paper. 5 photos.

32

Claims (1)

1376394 ► iQ1 year G1 month % correction replacement page ^ X. Patent application scope: ~ ^— 1. - Polyurethane film 'made of a polymer of aromatic diacid lysine' in the film a reference having a thickness of 50 to 1 〇〇μηη; measuring the light transmittance thereof using an ultraviolet spectrophotometer, the film having an average transmittance of 85% or more at a wavelength of 38 〇 to MO nm, and 誃5 The yellow index of the film is equal to or less than 15; the aromatic di(tetra) of the film comprises a mixture of two or more compounds selected from the group consisting of 2,2-bis(3,4-dicarboxyphenyl)hexa Fluorine-propane dianhydride (6_FDA), 4-(2,5-dioxotetrahydrofuran-3-yl)tetralin-l,2-dicarboxylic anhydride (TDA), and 4,4,-(4,4, Isopropyl 'glycolyldiphenoxy) bis(phthalic anhydride) (HBDA); and the aromatic diamine comprises a compound selected from the group consisting of the following, or a mixture of two or more compounds : Diphenylamine (〇DA), 1,3-bis(3-aminophenyloxy)benzene (APB_133), hydrazine, 3_bis(4-aminophenyloxy) stupid (APB-134), 1 4-bis(4-aminophenoxy)benzene (APB_144), 15 bis(3-aminophenyl); ε wind (3-DDS), bis(4-aminophenyl)sulfone (4-DDS) ), φ 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl (2,2,-TFDB), 3,3,-bis(trifluoromethyl)-4, 4,-Diaminobiphenyl (3,3,-TFDB), 2,2,-bis[4 (4-aminophenoxy)phenyl]hexafluoropropane (4_]81) VIII 17), 2 , 2,_bis[3(3-aminophenoxy)phenyl]hexafluoropropane (3_BDAF), 4,4,-bis(3-aminophenyl-2-decyloxy)diphenylanthracene (DBSDA) And 2,2-bis[4_(4-aminophenoxy)phenyl]propane (6-HMDA). 2. The polyamidamine film according to claim 1, wherein the transmittance is measured by an ultraviolet spectrophotometer at a wavelength of 50 to 1 Torr, at a wavelength of 551 to 780 nm. When the film has equal or large 33 1376394 Corrected replacement page on January 30, 101 At 88/. The average light transmittance is such that the film has a light transmittance equal to or greater than 88% at a wavelength of 55 Å, and the film has a light transmittance equal to or greater than 85 Å at a wavelength of 500 nm and a wavelength of 42 〇. At nm, the film has a light transmittance equal to or greater than 50%. 5 β 3. The polyweilai according to the first aspect of the patent application has an optical density of less than 50 at a wavelength of 42 〇 nm on the basis of a film thickness of 50 to 1 μm. 8. The poly-weimin film according to claim 1, wherein the film has a dielectric constant of 10 or less at 1 GHz on a basis of a film thickness of 50 to 100 qing. The polyaluminum yam according to claim 1, wherein the film has a temperature of 5 Torr to 2 Torr (&gt;c at a temperature of 50 to 1 〇〇μηη) Or an average coefficient of thermal expansion of less than 50 ppm. 6. The polyamidamine film according to the above-mentioned claim, wherein the film has a thickness equal to or greater than 丄〇GPa on the basis of a thickness of the film b of 50 to 100 μm. 7. The polyimin film according to claim 1, wherein the film is measured by an ultraviolet spectrophotometer under the reference of 50 to 100 μm of the film, the film Having a 等于 等于 等于 等于 等于 等于 等于 等于 具有 具有 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. 8. Polyimide film. 34