TW200900431A - Polyimide film - Google Patents

Abstract

Disclosed is a polyimide film, which is colorless and transparent and exhibits superior properties, including mechanical properties and heat stability, and thus is usable in various fields, including semiconductor insulating films, TFT-LCD insulating films, transparent electrode films, passivation films, liquid crystal alignment layers, optical communication materials, protective films for solar cells, and flexible display substrates.

Description

200900431 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a colorless and transparent polyimide film. [Prior Art] 5 In general, polyiminamide (PI) 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 a solution polymerization of an aromatic diamine or an aromatic diisocyanate. In the preparation of the poly-stylenin resin, the aromatic dianhydride includes, for example, pyromellitic dianhydride (PMDA) or pyromellitic dianhydride 10 (BPDA); and the aromatic diamine includes, for example, diphenylamine oxide. (〇DA), p-phenylenediamine (p-PDA), m-phenylenediamine (m_PDA), methylene diphenylamine (MDA), and diaminophenyl hexafluoropropane (hfda). Polyimide resin, which is insoluble, refractory, and extremely heat-resistant, has excellent properties including heat resistance, oxidation resistance, radiation resistance, low temperature resistance, and chemical resistance, and is used in various fields. 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-LCDs. 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 films, 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 that the light transmittance in the visible light range is annoyingly reduced. The yellow or brown color of the polyamide resin makes it difficult to apply in the field of transparency required to require 6 200900431. This (4) title 'many purified monomers and high-purity solvents for A ', has been achieved' but has little effect on the improvement of light transmittance. A method in which a (4) hetero-dianhydride is formed into a knife to replace a scented dianhydride is classified. Although this method is compatible with the purification method. The transparency and color of the liquid phase or the film phase, however, are still limited in terms of improving light transmission, and the goal is to achieve high transparency, and the thermal and mechanical properties thereof are also deteriorated. 10 15 20 in U.S. Patent Nos. 4,595,548, 4,601,061, 4,458,824, 5,972, 5,158,083, 5,093,453, 5,218,077, 5,367,046, 5,338,826, 5,986, 36, and 10, and Korean Patent Publication No. 2 Cutting 0〇9437, bribe_preparation of a novel structure of polyimidate' improves light transmittance and color transparency in a range where thermal properties are not significantly reduced, mainly using such as _〇_, _8〇2_ or a linking group of CH2_, a bent structure formed by a hetero (P_pGSiti〇n) linkage at a meta position (m_pGsitiGn), or an aromatic diacid field and an aromatic second having a substituent of _cf3 Amine monomer. However, such polytertamide has been confirmed to be insufficient for use in a semiconductor film "TFT_IXD insulating film, an electrode film, and a flexible display substrate" in terms of mechanical properties and visible light transmittance. 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 a polyamidamine film made of a polymer of an aromatic diacid 7 200900431 liver and an aromatic diamine, which is based on a film thickness of 50 to 100 μm. The ultraviolet spectrophotometer measures the light transmittance 'having an average light transmittance equal to or greater than 85% at a wavelength of 380 to 780 nm and having a yellow index equal to or less than 15. 5 The polyimide film according to this embodiment has a light transmittance measured by an ultraviolet spectrophotometer based on a film thickness of 50 to 1 μm, and may have a wavelength equal to or greater than a wavelength of 551 to 780 nm. The average light transmittance of 88% may have a light transmittance equal to or greater than 88% at a wavelength of 550 nm and may be equal to or greater than 85 °/ at a wavelength of 5〇〇11111. The light transmittance, and at a wavelength of 42 〇 ίο nm, may have a light transmittance equal to or greater than 50%. The polyacrylamide film according to this embodiment can 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 polyamidamine film according to this embodiment, the aromatic dianhydride may comprise a compound or a mixture of two or more compounds selected from the group consisting of 2,2-bis (3,4-di) Carboxyphenyl) hexafluoropropane dianhydride (6, FDA), 4-(2,5-dioxotetrahydrofuran-3-yl)-1,2,3, 4-tetrahydronaphthalene-1,2-if (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), 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 (1,4-bis(4_aminophenoxy)benzene, APB-144), double (3- Bis(3-aminophenyl)sulfone, 3-DDS, bis(4-aminophenyl)sulfone, 4-DDS, 2,2'- Bis(trifluoromethyl)-4,4'-diaminobiphenyl (2,2'-1^(1;11£111〇1:〇11^]1>4)-4,4'-diaminobiphenyl , 2,2'-butyl fluorene 08), 3,3'-bis(trifluoromethyl)-4,4,-10 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-amino) Oxy)phenyl]hexafluoropropane (2,2,-bis[3(3-aminophenoxy)phenyl]hexafluoropropane, 3-BD 15 AF), 4,4'-bis(3-aminophenylindenyl) Phenylsulfone (4,4J-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. 9 200900431 The polyimide film according to the third embodiment may have a modulus equal to or greater than 30 GPa based on the film thickness of 5 Å to 1 Å μηη. The polyamidamine film according to the second embodiment may have a 50% ultraviolet cut-off wavelength of 40011111 or less based on a film thickness of 50 to 100. The present invention can provide a polyacrylamide 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 a semiconductor insulating film, a TFT_LCD insulating film, a passivation film, and a liquid crystal alignment. Layer, optical communication material, protective film for solar cells, and soft 10-display substrate. The present invention also provides a liquid crystal alignment layer and a poly-aniline film using the polyamidamine resin. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a 15 piece of a polyimide film placed on a sheet of paper of Example 1, and the second picture is a film of a polyimide film 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 polyamidamide 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 light transmittance of 50 to 1 〇〇μη based on a film thickness of 200900431, and is measured by an ultraviolet spectrophotometer at a wavelength of 38 〇 to 780 nm. An average light transmittance greater than 85%, and having a yellow index equal to or less than 15. , 'In addition, the polyimide film is based on a film thickness of 50 to 100 μm, and 5 is measured by an ultraviolet spectrophotometer. When the wavelength is 551 ^ 78 〇 nm, it is preferably equal to or The average light transmittance of more than 88% preferably has a light transmittance equal to or greater than 88% at a wavelength of 550 nm, and preferably has a light transmittance equal to or greater than 85% at a wavelength of 500 nm. And at a wavelength of 42 〇 nm, it is preferred to have a light transmittance equal to or greater than 5%. 10 The polyiminamide film of the present invention which meets the aforementioned light transmittance and yellow index can be applied to a field in which a conventional yellow polyimide film is difficult to apply and has high transparency requirements, including protection of TFT_LCD or diffusion. The board and the layer, such as the interlayer of the TFT-LCD, the gate insulating layer ((10) Insulator) and the 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 polyiminamide film of the present invention may have an optical density of less than 5 Å at a wavelength of 420 nm based on the thickness of 50 to 100. A polyamidamine film conforming to the aforementioned optical density and light transmittance of 2 , reduces the refractive index of the light used to indicate the light penetrating the film, so that the color and size of the target penetrating the film Or the positional 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. 200900431 For the purpose of the 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 the group consisting of 2,2-bis (3,4- Dicarboxyl phenyl) hexafluoropropane: anhydride (6-FDA), and 4_(2,5-dioxotetrahydrofuran-3-yl) 5 tetrahydronaphthalene-1,2-dicarboxylic anhydride (TDA) and 4,4 ,-(4,4,-isopropenyldiphenoxy) bis(o-dimethanedicarboxylic 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 (〇DA) and 1,3-double ( 3-aminophenoxy)benzene 10 (APB-133), 1,3-bis(4-aminophenoxy)benzene (APB-134), 1,4-bis(4-aminophenoxy) Benzene (ΑρΒ·144), bis(3-aminophenyl)sulfone (3-DDS), bis(4-aminophenoxy)sulfone (4-DDS), 2,2,-bis(trifluoro Indenyl)-4,4'-diaminobiphenyl (2,2,-butyrin 03), 3,3,-bis(trifluoromethyl)-4,4'-diaminobiphenyl (3 , 3'-TFDB), 2,2'-bis[4(4-aminophenoxy)15phenyl]hexafluoropropane (4-BDAF), 2,2'-bis[3 (3-amino group) Phenoxy)phenyl]hexafluoropropane (3-BDAF), 4,4'-bis(3-aminophenoxy)disuccinylsulfone (DBSDA) and 2,2-bis[4- (4- Aminophenoxy)phenyl]propane (6-HMDA). The dianhydride and the diamine are dissolved in an organic solvent in an equivalent molar amount, and then reacted to prepare a polyaminic 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 in 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 it can be dissolved in the polyacetin. In the generally known reaction solvent, one or more polar solvents selected from the group consisting of m-cresol, N-methyl-2-π-decane oxime (NMP), and dimethylformamide (DMF) are used. ), dimethylacetamide (DMAc), dimethyl sulfoxide (DMS0), acetone, and diethyl 5-acetate. Further, a low boiling point solvent such as tetrahydrofuran (THF) or milky form, or a low absorption solvent such as butyl hydrazine 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 a suitable knives and viscosity, the organic solvent is preferably used in an amount of 5 Torr to % by weight based on the total amount of the polyamidonic acid solution. The percentage is 10 (wt%), and more preferably 70 to 90% by weight. In addition, when the polyamidamine film is produced by using a polyaminic acid solution, a filler can be added to the polyfluorene solution to enhance various properties of the polyimide film, including slidability, thermal conductivity, and electrical conductivity. And corona resistance. Filler and 15

20 There is no special, but specific examples include dioxo, oxidized, layered dioxide dreams, carbon nanotubes, oxygen tilting, nitrogen cutting, nitriding, calcium sulphate, calcium phosphate and mica. The particle size of the filler may vary depending on the nature of the film to be modified and the type of filler to be added, and there is no special hemp. Filling in (4) the average grain count is better than the range of 0. 〇〇 5 to 25 _, and most preferably in the range of 0.01 to 10 _. In this case, it is easily and effectively modified, and can also exhibit a good surface: = electrical and mechanical properties" S ^ different, 13 200900431 to 20 parts by weight, preferably 0.01 to 10 weight of filler is added 0.001 parts by weight. The method of adding 1 person/5,: is not particularly limited, but for example, it is included in the addition of 5 broth to the poly-proline solution, and the completion of the poly scorpion 2' using a three-roll mill secret filler, Or 3 with a dispersion test mixed with the Wei thief solution.

15 The method for producing the poly-branched acid obtained by using the polyamic acid solution obtained in this manner is not particularly limited, and any conventionally known method can be used. Polyammonium-soluble (iv) imidization includes, for example, thermal amidation and "an amination" in which chemical amidation is particularly effective. Chemical amidoximation by dehydrating agents, including anhydrides For example, acetic anhydride, and amidoxime catalyst, including tertiary amines, such as isoindolin, methylidene, or tonidine, = added to a polyamidonic acid solution. Chemical imidization can be accompanied

The thermal amidation is carried out, and the addition of the secret component may vary depending on the type of the proline solution and the thickness of the film. Heating the polylysine solution on the substrate at 80 to 200 ° C, preferably at 1 to 18 ° C, to activate the dehydrating agent and the hydrazide catalyst to complete partial hardening and drying To obtain a poly-proline film in a gel state, to separate a poly-proline film from a substrate, and to heat a film in a gel state at 200 to 400 ° C for 5 to 400 seconds to obtain a polyamidamine. membrane. The thickness of the polyimide film thus obtained is not particularly limited, but the film thickness is preferably in the range of 10 to 250 μηη, more preferably in the range of 25 to 150 μηη, in view of the field of application thereof. . The polyimine film of the present invention has an electric number of 1 GHz 14 200900431 at 1 GHz, and thus can be used as a semiconductor purification film. The polyiminamide film of the present invention has an average coefficient of thermal expansion equal to or less than 50 ppm at 50 to 200 °C. If the average coefficient of thermal expansion exceeds 5 〇 ppm, when the polyimide film is applied to a thin film transistor array (TFT ARRAY) process in which a thin film transistor (TFT) is placed on a thin 5 film, polyamidoguanidine may be used. It will shrink or expand with different process temperatures, resulting in failure to achieve alignment in the electrode doping process. In addition, the film cannot be kept flat and can be wound up. Therefore, when the coefficient of thermal expansion is reduced, the TFT process can be performed more accurately. The polyimide film of the present invention has a modulus of three or more and 3.0 GPa. In this example, the polyimide film can be more easily taken into account in the roll-to-roll process of the flexible display substrate. When a polyimide film is used as a base film of a flexible display and a soft copper foil substrate (FCCL), a roll press is performed. At this time, since the film is subjected to tension when it is wound by the drum with I5 and released from the drum, the film having a modulus of less than 3 〇GPa may be broken. The polyimide film of the present invention has a cutoff wavelength of 5 % or less of copper nm, which is measured according to the transmittance using an ultraviolet spectrophotometer. Therefore, the polyamidamine of the present invention can be used as a 2-inch protective film for solar cells. The following examples are included to better understand the present invention, but the examples are not to be construed as limiting the invention. &lt;Example 1&gt; When nitrogen gas was passed through a 100 mL three-neck (3-Neck) round bottom flask equipped with a sandalwood mixer, a nitrogen inlet, a dropping funnel, a condenser, and a condenser, 32.4623 g N,N-dimethylacetamide (DMAc) was added to the round bottom flask, and the temperature of the reaction apparatus was lowered to 〇cC, and 4.1051 g (0.01 mol) of 6-HMDA was dissolved therein. . This solution was maintained at a temperature of 5 〇 °C. 3.1 〇 97 g (0.007 mol) of 6-FDA and 0.90078 g (0.003 mol) of TDA were 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 at room temperature for 8 hours 4' to give a poly-branched acid solution having a viscosity of 2200 cps at 23 °C. 10 Thereafter, a polyamic acid solution having a thickness of 500 to 1000 μm was applied on the glass substrate using a doctor blade, and then dried in a vacuum oven at a temperature of 4 ° C for 1 hour, and at a temperature of 60 ° C. It was dried for 2 hours to produce a Self Standing Film. Next, the film was allowed to harden at a heating rate of 5 ° C per minute in a high-temperature oven at 3 ° C for 8 hours, and at 100 ° C for 1 hour, 2 Torr. (: under hardening for 丨 hours and 3 〇〇〇c for 3 〇 minutes to produce a polyacrylamide film having a thickness of 5 〇μιη^ 1 〇〇 μηη. <Example 2> As an example, 4.1051 g (0 〇1) 6_HMDA is dissolved in 3L gram of DMAc, and this solution is maintained at the temperature of 〇〇c. 2.2215 g (0.005 m) of 6_ ship and 5 〇 13 g (〇 The TDA of Schmöll was added to the solution in a timely manner, and the solution was raised for a few hours until the 6-FDA and TDA were completely dissolved. The solid content of the solution was 2% by weight (10% by weight). Money, at room temperature, Lai (four) lions for 8 hours, 16 200900431 to produce a polylysine solution with a viscosity of 2000 cps at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1. <Example 3> As in Example 1, 4.1051 g (0.01 mol) of 6_HMDA was dissolved in 30.15868 g of DMAc, and this solution was maintained at a temperature of 〇(&gt;c. 1.11275 g (0.003 m) 6_FDA* 2 1〇182 g (〇〇〇7 mol) of TDA was added to the solution in sequence, and the solution was stirred for a few hours until the 6-FDA and TDA were completely dissolved. The solid content of the solution was 2% by weight ( Then, the solution was stirred at room temperature for 8 hours to produce a polyphthalic acid solution having a viscosity of 18 〇〇CpS at 23 ° C. Thereafter, the same manner as in Example 1 was employed. A polyimide film was produced. &lt;Example 4&gt; As in Example 1 ' 2.87357 g (0.007 mol) of 6_HMDA was dissolved in 30.5158 g of DMAc, and then 7 449 g (0.003 mol) of 3-DDS Add and completely dissolve. Add 31〇97g (〇〇〇7mol) of 6-FDA and 0.90078g (0.003m) of TDA to the solution in sequence and stir the solution for 1 hour' until 6_FDA with The TDA is completely dissolved. The solid content of the solution is 20% by weight (wt〇/〇). Then, it will be obtained at room temperature. The solution was stirred for 8 hours to produce a polylysine solution having a viscosity of 2000 cps at 23 ° C. Thereafter, a polyimine film was produced in the same manner as in Example 1. &lt;Example 5&gt; 1, 2.87357 g (0.007 mol) of 6-HMDA was dissolved in 30·5158 g of DMAc, and 0.7449 g (〇.〇〇3 mol) 17 200900431 was added to the solution and completely dissolved. 3 ΐ () 97 g (〇.007 mol) of 6-FDA and 〇.9_g (_mole) of tda was added to the solution, and the solution was stirred for an hour until 6_fda and TDA were completely dissolved. The solid content of the solution was 2% by weight (wt%). Then, 5 (4) was stirred at room temperature for 8 hours, and the polyamic acid solution having a viscosity of 2000 cps was born. A poly-Asian film was produced in the same manner as in Example 1. &lt;Example 6&gt; As an example, 2.241161 g (〇 莫 )) 2, 2, _ legs and 10 0.7 449 g (0.003 m) of 3 7 Ds Dissolved in (four) grams of DMAc. Add 3.1097 grams (〇.〇〇7 Moer) of 6_fda and 〇9〇〇78 grams (0.003 moles) of TDA sequentially. Solution, and the solution was granted off} h 'until 6-FDA and TDA was completely dissolved solids content of the solution is 2〇 weight percent (wt%). Then, the solution was disturbed at room temperature for 8 15 hours τ to produce a polyaminic 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 7&gt; As in the example, 2.241161 g (〇7 mol) of 2,2,_tfdb and 0.7449 g (0.003 mol) of 4 7 Ds were dissolved in 27 98796 g of 20 DMAc. Add 3.1097 g (〇.〇〇7 Moel) of 6 fda and 〇9〇〇78 g (0.003 mol) of TDA to the solution in sequence, and dispense the solution for 1 hour until 6-FDA and TDA are completely Dissolved. The solid content of the solution was 20% by weight (wt%). Then, the solution 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 C. 200900431 Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 8&gt; As in the example, 3.62922 g (0.007 mol) of 4-BDAF was dissolved in 33.5386 g of DMAc, and then 0.7449 g (0.003 mol) of 5_DDS was added to the solution, and completely dissolved. 3 grams of 6-FDA and 0.90078 grams (0.003 moles) of TDA were added to the solution sequentially, and the solution was scrambled for 1 hour until 6_fda and TDA were 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 10 at 2200 cps at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;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 (0.003 mol) of 15-DDS was added to the solution and completely dissolved. . 3.1097 g (0.007 mol) of 6-FOA and 0.90078 g (0.003 mol) of TDA were sequentially added to the solution' and the solution was dropped for 1 hour until the 6-FDA spot XDA was completely dissolved. The solid content of the solution was 20% by weight (wt%;). Then, the solution was stirred at room temperature for 8 hours to give a polyaminic acid solution having a viscosity of 20 at 2100 cps at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 10&gt; As in the example, 2.04631 g (0.007 mol) of APB_133 and 0.7449 g (0.003 mol) of 3-DDS were completely dissolved in the DMAC of 27.20696 200900431 g. 6 FDA and 3.0078 g (0.003 mol) of TDA were added sequentially to the solution, and the obtained solution was allowed to stand for 1 hour until 6_FDA and TDA were completely dissolved. The solid content of the solution was 20% by weight (wt%). Then, the solution was mixed for 8 hours at room temperature to give a polyamic acid solution having a viscosity of 23 Å at 23 Å. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 11&gt; As in the example, 2.04631 g (0.007 mol) of ΑΡΒ·133 and ίο 0.7449 g (0.003 mol) of 4_DDS, completely dissolved in 27 2〇696 g of DMAe. 3.10975 g (0.007 6_FDA and 0.90078 g (0.003 mol) of TDA were added to the solution in sequence, and the mixture was stirred for 1 hour until the 6-FDA and TDA were completely dissolved. The obtained solids of the solution were directly 20 weights. Percentage (wt%). Then, the solution was stirred for 8 hours under room temperature I5 to give a poly(prolinic acid solution) having a viscosity of I950 cps. Thereafter, the method was as in Example 1. Production of polyamidoguanidine. &lt;Example 12&gt; As in Example 1, 3.2023 g (〇.〇1 mol) of 2,2,-TFDB was completely dissolved in 30-986 g of DMAc. The temperature at 〇〇c. 3.64355 g (0.007 m) of 6-HBDA and 0.90078 g (0.003 m) TDA was added to the solution in sequence, and the mixture was scrambled for 1 hour until 6-HBDA and TDA were completely dissolved. The obtained solution had a solid content of 20% by weight (wt%). Then, it was dissolved at room temperature 200900431 The solution was stirred for 8 hours to give a polyaminic 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 the example. &lt;Example 13&gt; Example 1 '2.483 gmol' of the 4-DDS system was dissolved in 28.1093 g of DMAc' to maintain the solution at 〇〇c. 3.64355 g (0.007 mol) of 6_HBDA and 〇9〇〇78 g (〇 T3 Mox) TDA was added to the solution sequentially, and the solution was stirred for a few hours until 6-HBDA and TDA were completely dissolved. The solid content of the solution was 2 〇 by weight 10% (wt%). Then, at room temperature The solution was stirred for 8 hours to give a poly-aramidic acid solution having a viscosity of 18 〇〇 CpS at 23 ° C. Thereafter, a polyimide film was produced in the same manner as in Example 1. &lt;Example 14&gt; As in Example 1, 5.1846 g (〇.〇1 Moel) of 4_BDAF is dissolved in U at 38.91 57 g of DMAc and keep the solution 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 1 hour until 6-HBDA is completely dissolved with TDA. The solid content of the solution was 2% by weight (wt%). Then, the solution was stirred at room temperature for 8 hours to obtain a polyaminic acid solution having a viscosity of 200 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 ' 2.24161 g (0.007 mol) of 2,2,-TFDB and 0.7449 g (0.003 mol) of 4-DDS, it was completely dissolved in 30.3628 21 200900431 g of DMAc. The solution is maintained at the temperature of 〇〇c. 3 μg (0.007 mol) of 6_HBDA and 〇.96〇69 g (〇 3 mol) of TDA were sequentially added to the solution and stirred for 1 hour until the 6-hbda disk was completely dissolved. The (iv) content of the solution was 2 G weight percent (wt%). After the narrowing, the solution was mixed for 8 hours at room temperature to produce a polyaminic acid solution having a viscosity of 1700 cps at the time of sedimentation.

Thereafter, a poly Asia &lt;Example 16&gt; guanamine film was produced in the same manner as in Example 1 as an example of a gram of 22 g (0·〇〇7 Moel). On the side, it is completely dissolved in DMAc of π-gram. The solution is maintained at the temperature of 〇〇c. We finely (0.007 mol) of 6_HBDA and 0.96069 g (〇 〇〇3 mol) of TDA were added to the solution sequentially and mixed for 1 hour until the 6_hbda tray tda was completely dissolved. The dissolved _ content was 2 G weight percent (wt%). After the absence, the solution was mixed for 8 hours at room temperature to produce a polyaminic acid solution having a viscosity of 1700 cps. Thereafter, a poly-aniline film was produced in the same manner as in Example 1. &lt;Example 17&gt; As in the example, 2.241161 g (_7 mol) of 2,2,_tfdb and 1.55538 ((G.GG3 Moer) 3_BDAF were added and completely dissolved in 33.60472 g of DMAc. The solution is maintained at the temperature of 〇〇c. 3:6435 g (0·007 mol) of 6_HBDA and 〇96〇69 g (〇细莫) of TDA were sequentially added to the solution and caked for 1 hour until 6_hbda and TDA were completely dissolved. The solids content of the solution is 2% by weight 22 200900431 (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;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-FOA. The solution was stirred for 1 hour until 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 to give a polyamic acid solution having a viscosity of 1300 cps ίο at 23 °C. Thereafter, a polyimide film was produced in the same manner as in Example 1, and the film thicknesses were 25 μm, 50 μm and 1 μm, respectively. &lt;Comparative Example 2&gt; As in Example 1, 2.9233 g (0.01 mol) of ΑΡΒ·133 is dissolved in 29.4632 g of DMAc' followed by 4.4425 g (0.01 mol) of 6-FDA. The solution was stirred for 1 hour until 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 to give 23. (: Polyurethane solution having a viscosity of 12 〇〇 cps. 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 (〇. The 3D DDS of 〇1 mol was dissolved in 27.702 g of DMAc. Then 4.4425 g of 6-FDA was added. The solution was stirred for 1 hour until 6_FDA was completely dissolved. 23 200900431 Solids of solution The content was 20% by weight (wt 〇 / 0). Then, the solution was stirred at room temperature for 8 hours to give a poly (proline) solution having a viscosity of 1300 cps. The polyimide film was produced in the same manner as in Example 1. 5 &lt;Comparative Example 4&gt; As in Example 1, 2.4830 g (〇.〇1 mol) of the 4-DDS system was dissolved in 27.702 g of DMAc, followed by 4.4425 g. 6-FDA addition of (〇·〇1mol). Stir the solution for 1 hour until 6_FDA is completely dissolved. The solid content of the solution is 20% by weight (wt%). Then, stir the solution at room temperature for 10 pieces. 8 hours' to produce a polyamic acid solution with a viscosity of 1400 cps at 23 ° C. 'Polyammine film was produced in the same manner as in Comparative Example 1. &lt;Comparative Example 5&gt; As an example, 2.0024 g (〇.〇1 Moel) of 3,3,_〇da is a solution of 25.7796 g. In DMAc, '4,425 g (〇〇1 mol) of 6-FDA was added, and the obtained solution was stirred for 1 hour until 6_FDA was completely dissolved. The solid content of the solution was 20% by weight (wt%). The solution was stirred at room temperature for 8 hours to produce a polyaminic acid solution having a viscosity of 1600 cps at 23 ° C. 2 〇 Money 'The polyimide film was produced in the same manner as in Comparative Example 1. &lt;;Comparative example 6&gt;

As in the example, 2.0024 g (〇.〇1 Moel) of 4,4,_〇DA is dissolved in 16.7344 g of DMAc, then 21,812 g (〇〇1 mol) of PMDA is added and will be obtained. The solution is mixed for i hours until pMDA 24 200900431 is completely dissolved

When the solution was produced at 23 ° C, the solution was stirred at room temperature for 8 hours to obtain a 2500 p〇ise polyamine solution. Thereafter, a polyimide film was produced in the same manner as in Comparative Example 1. The properties of the polyimide membranes prepared by the above examples and comparative examples were measured in the following manner. The results are summarized in the following table to Table 4. (1) Light transmittance and 50% cut-off wavelength. The ultraviolet light spectrophotometer (Varian Technology Co., Ltd., Varian, model CarylGG) was used to measure the visible light transmittance rate of each polyacrylamide film and 5〇. % cutoff wavelength. The polyimide film of Example 1 and Comparative Example 6 having a 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 (〇D, optical density) The optical density is calculated according to the following equation 1: Equation 1 0£)x=s A± = --1- log 1〇Γ [ =-^- log ιο(-^· Where / is the thickness of the film, 4 is the absorbance at a wavelength of λ, r is the light transmittance '4 is the incident light intensity, and / is the transmitted light intensity. (4) Modulus Using Instron's universal testing machine (Universal 25 200900431)

Testing Machine) Model Model 1000, which measures the modulus according to JIS Κ 6301. (5) Glass transition temperature (Tg) The glass transition temperature was measured using a scanning thermal differential analyzer (DSC, ΤΑ instrument, model Q2〇〇), 5. (6) Thermal expansion coefficient (CTE) Using a thermomechanical analyzer (ΤΜΑ' ΤΑ instrument, model Q400), according to the thermomechanical analysis method (TMA-Method) '50 to 200. (: The coefficient of thermal expansion is measured. ^ 1〇(7) Dielectric constant The dielectric constant is measured according to ASTM D150. [Table 1] Composition Mohr ratio film thickness (μιη) Transmittance optical density 380 nm to 780 nm 551 Nm to 780 nm 550 nm 500 run 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 200900431 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 87.8 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 20090 0431 [Table 2] Light transmittance Optical density composition Mohby film thickness (μιη) 380 nm to 551 nm to 550 500 420 550 500 420 780 nm 780 nm 11111 11111 11111 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 •4:々祀4 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 Compared with 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 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 10:10 50 56.0 84.5 69.2 33. 1 0 31.97 96.03 - 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 [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 1 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 &quot ;^Ho1 50 3.49 386 3.42 240 42 2.79 3 6-FDA+TDA/6-HMDA 3:7:10 50 3.51 386 3.51 226 44 2.85 4 6-FDA+TDA/ 6-HMDA+3-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 200900431 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/ 2,2'-TFDB+3 -BDAF 7:3:7:3 50 3.86 388 3.06 218 46 2.9 ±/c 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 200900431 Table 4] Composition Mohrby Film Thickness (μιη) Yellow Index 50% Cutoff Wavelength (nm) Modulus (GPa) Tg (°C) ΓΤΤΡ (ppm/°C) Dielectric Constant A GHz Ratio 1 6-FDA/ 4-BDAF 10:10 25 9.7 411 3.0 263 52.3 2.5 2 6-FDA/APB-133 10:10 25 5.5 395 3.05 206 47.1 2.7 More than 3 6-FDA/3-DDS 10:10 25 1.82 388 3.1 270 47 3.0 Fan 4 6- FDA/4-DDS 10:10 25 1.68 382 3.1 310 46 3.1 Example 5 6-FDA/3,3,-ODA 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 1 6-FDA/4-BDAF 10:10 50 11.2 413 3.06 - 51.1 Than 2 6-FDA/APB-133 10:10 50 6.9 398 3.11 - 46.0 Compared to 3 6-FDA/3-DDS 10:10 50 2.95 392 3.16 45.3 Fan 4 6-FDA/4-DDS 10:10 50 2.81 386 3.17 - 45.1 Example 5 6-FDA/3,3,-ODA 10:10 50 6.46 399 3.05 Field 39.6 6 ^MDA/ODA 10:10 50 - 3.12 25.0 1 6-FDA/4-BDAF 10:10 100 23.4 415 3.09 • 48.8 to 2 6-FDA/APB-133 10:10 100 14.2 401 Γ3.14 • 44.5 Compared to 3 6-FDA/3-DDS 10:10 100 Γ^54 396 3.20 - 44.9 Fan 4 6-FDA/4-DDS 10:10 100 4.26 390 3.22 Example 5 6-FDA/3,3,-ODA 10:10 100 ^.26 405 ^3.13 39.1 6 PMDA/ODA 10:10 100 - - - From the measurement results of the above properties, it is apparent that the present invention has a polyimide film having a film thickness of 50 μm and ΙΟΟμιη at a wavelength of 38 〇 to 78 〇 11111.

The average light transmittance at the time of equal to or greater than 85% 'yellow index is equal to or less than 15, and the optical density at a wavelength of 420 nm is equal to or less than 5 Å. As shown in the first figure, the polyimide film conforming to the aforementioned light transmittance, yellow index and optical density is transparent so that the yellow characters and lines printed on the paper placed underneath can be seen. Degree. In the comparative example, regardless of the film thickness, there is no example of an average transmittance of more than 85% at a wavelength of 380 to 780 nm in the visible light range. Further, in Comparative Example 6, a polyimide film having a film thickness equal to 30 200900431 or more than 90 μm was not produced. The polyacrylamide film produced in each of the examples of the present invention has a light transmittance of 5 % when the wave is smaller than the side rnn, and finally realizes a colorless transparent polyamidoguanidine having a light transmittance of isochromatic light. Therefore, the present invention can be used as a surface protective film for solar cells. Further, since the polyimide film has an average coefficient of thermal expansion of 5 Å or less, it exhibits high dimensional stability and, since its modulus or the like = or = 3.0 GPa, it appears to be applied to crimping (R). 〇Ut〇〇11) The film properties of the two processes. Furthermore, the polyamidamine film of the present invention can also be applied to a TFT process for a flexible display substrate and a movable display, and, = the film has a dielectric constant equal to or less than 3.0, and can be used for ^ Passivation film.守体31 200900431 [Simple description of the diagram] The first picture is a photograph of the polyamido film of Example 1 placed on a piece of paper; and the second picture is a film of the polyimide film of Comparative Example 1 placed in a sheet 5 photos on paper.

32

Claims (1)

200900431 X. Patent application scope: The product ' is made of aromatic diacid oxime and aromatic diamine, and the film thickness is 5G to (10). The transmittance is measured by using Zi Ziqi Photometer. The * color of the film is equal to or greater than 85% of the average light transmittance 'and the page color index of the Μ is equal to or less than 15. = For example, if the Weiwei 丨 状 聚 聚 聚 赖 , , , , , , , GG GG GG ϋ GG GG ϋ ϋ ϋ GG ϋ GG GG ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ ϋ Having an average light transmittance equal to or greater than 88%, the film having a light transmittance equal to or greater than 88% at a wavelength of the lung, and having a light transmittance equal to or greater than 85/〇 at a wavelength · nm And at a wavelength of 42 〇 nm, the film has a light transmittance equal to or greater than 50%. 3. The polyamidamide film according to the scope of the patent application, wherein the film has a thickness of 50 to 1 μm, at a wavelength of 42 〇 nm, the film 15 has an optical density of less than 50. 4. The polyamidamine film according to claim 1, wherein the aromatic dianhydride comprises a compound or a mixture of two or more compounds selected from the group consisting of the following: : 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6-FDA) ' 4- (2,5-dioxotetrahydro 2 〇 喃 -3-yl)~ι, 2,3,4-tetrahydronaphthalene-1,2-dicarboxylic acid field (TDA), and 4,4'-(4,4'-isopropenyldiphenoxy) bis(phthalic anhydride) (HBDA). 5. The polyamidamine film according to claim 1, wherein the aromatic diamine comprises a compound or a compound of two or more compounds. 200900431 Mixture of the compound is selected from the group consisting of Scale: Oxidation (ODA), 1,3-bisindole-aminophenoxy) stupid (ApB_, u-aminophenoxy)benzene (ΑΡΒ·134), bis(oxy) sulfone (4-DDS), 2,2,-bis(trismethyl)(2,2,-TFDB), 3,3,bis (m W/^-amino-linked methyl)~4,4-diaminobiphenyl TFDB), 2,, 2'-bis[4 (4-aminophenoxy) phenyl] hexapropane (10) dioxin 2:2::bis[3 (decylaminophenoxy)phenyl Hexafluoropropane, bis(3-aminophenoxy)diphenyl sulfone (DBSDA), and 2,2-bis[4-(4-aminophenoxy)phenyl]propyl _hmda ). 6. The polyamidamine film according to claim 1, wherein the film has a dielectric constant equal to or less than 3.0 at 1 GHz on the basis of a film thickness of 5 Å S 100 μm. , 15 20 7. The film is as described in the 凊 凊 凊 丨 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 'has an average coefficient of thermal expansion equal to or less than 50 Ppm. β 8. The polyamidamine film according to the above-mentioned patent application, wherein the film has a modulus equal to or greater than 3 〇 GPa on the basis of a film thickness of 50 to 10 μm. 9. For example, the polyaluminum yam as described in Item 1 of the Apparent Eyes, the light transmittance is measured using an ultraviolet spectrophotometer under the reference of the film f degree of 50 to 1 〇〇 μηη, the film has A cut-off wavelength equal to or less than 5 (4) cut-off wavelengths of the present invention. A substrate for a display comprising the polyimide film according to any one of claims 1 to 9 34 to 200900431. 35 200900431 VII. Designation of representative drawings: (1) The representative representative of the case is: (1) Figure (2) The symbol of the symbol of the representative figure is simple: No. 8. If there is a chemical formula in this case, please reveal the characteristics that can best show the invention. Chemical formula: none