KR20120070115A - Method of manufacturing polarizing film non-elongated dye-based and film manufactured from the same - Google Patents

Abstract

PURPOSE: A non-elongated dye-based polarizing film manufacturing method and a polarizing film manufactured through the same are provided for mass production by coating and hardening the mixture of a specific coloring and adhesive on a optical film. CONSTITUTION: A non-elongated dye-based polarizing film manufacturing method is as follows. Nano-wire is formed into fiber structure by electric weaving polymer in a rubbing roll. Alignment characteristic is given to an alignment layer formed in a marked film by using a rubbing roll. Dye is coated and hardened on the alignment layer. The polymer is one of polyethylene terephthalate (PET), polycarbonate(PC), polymethyl methacrylate(PMMA), polyethylene naphthalate(PEN), of polystyrene(PS). The alignment layer is made of alignment layer composition composed of binder resin, photoinitiator, and solvent and comprises 10~20 weight photoinitiator and 300~600 weight solvent based on 100 weight binder resin.

Description

Method for manufacturing unstretched dye-based polarizing film and polarizing film manufactured therefrom {Method of manufacturing polarizing film non-elongated dye-based and film manufactured from the same}

The present invention is a polarizing film manufacturing method for realizing polarization using a dye in detail to form an alignment film using the electrospinning, coating a mixed dye to match the existing stretched polarizing film, with a simple process and low manufacturing cost The present invention relates to a method for producing a non-stretchable dye-based polarizing film capable of processing.

Polarizing films are optical films used in thin film transistor liquid crystal displays (TFT-LCDs) such as notebook computers and monitors, filters for camera special effects, and stereoscopic glasses. Although the intensity of light emitted from the backlight of the liquid crystal display (LCD) module is equal in all directions, the polarizing film transmits only the light oscillating in the same direction as the polarization axis, and absorbs or reflects the other light to create polarization in a specific direction. Do it. In this case, when the polarization passes the LCD liquid crystal, the brightness of the pixel is changed by electrically adjusting the alignment direction of the liquid crystal for each pixel. In particular, LCDs use linear polarizers or circular polarizers to control the optical or birefringence of the display. OLEDs also use circular polarizers to prevent reflection of external light.

Currently, the most commonly used polarizing film is a substrate film formed of a polyvinyl alcohol resin is immersed in a uniaxial direction after immersing in a dichroic dye solution that absorbs light in the visible region (400 ~ 550 nm) of iodine solution, and accordingly It is made to have a degree of orientation. However, iodine has a disadvantage of insufficient heat resistance or light resistance when used in a polarizing film because of its high sublimability. Therefore, in order to satisfy transparency, moisture resistance, heat resistance, and weather resistance, the polarizing film uses a resin made of a hydrophobic polymer as the base film, and further, in order to ensure durability, a film-like material having a transparency on at least one surface (protective coating layer It is prepared by covering both sides with). As an example of a conventional polarizing film, Korean Unexamined Patent Publication No. 1988-700282 discloses well mixing a polyethylene terephthalate with a dichroic organic colorant which is substantially insoluble in water, an organic solvent and a liquid crystal, and then melts the resulting mixture into a film. Proposed polarizing film is proposed. Since the polarizing film is prepared by using a hydrophobic polymer base film and mixing a colorant capable of imparting excellent polarization power on the base film, the polarizing film has transparency, moisture resistance, heat resistance, and weather resistance, and the dichroic ratio of the colorant is high. It is specified that it is 7 or more. However, since the polarizing film of the present invention must be stretched 3 to 10 times and then subjected to a heat treatment process, problems such as color change according to the stretching ratio, optical anisotropy due to stretching of the base film, and heat shrinkage can not be avoided. Reliability cannot be secured.

Therefore, to apply industrially, the problem of optical anisotropy must be solved. In addition, Korean Unexamined Patent Publication No. 1997-25950 discloses a polyester film prepared by containing 2 to 50 mol% of 1,4-cyclohexanedimethanol instead of ethylene glycol as a diol component in a polymerization composition of polyester. By using it, the transparency of the polyester film is easily resolved due to the high crystallinity of the polyester film, but after the dye dyeing 4-10 times uniaxial stretching process can not be avoided, there is still a problem of optical anisotropy to be applied industrially Insufficient

In addition, Korean Patent Laid-Open Publication No. 2004-105583 discloses a polarizing sheet prepared by attaching a known polarizing film to a transparent sheet after preparing a transparent sheet using a polycarbonate resin composition having a specific structural formula by melt extrusion. have. The polarizing sheet of the present invention has a low birefringence to improve the optical anisotropy problem, high birefringence due to the large photoelastic constant of the polycarbonate resin derived from bisphenol A, rainbow color nonuniformity, colored interference pattern, etc. However, since the conventional polarizing film is used as it is, it is not enough to replace the polarizing material.

On the other hand, Korean Patent Laid-Open Publication No. 2007-28304 discloses a dye composition for anisotropic dye films capable of forming an anisotropic dye film exhibiting strong dichroism, an anisotropic dye film formed by using such a dye composition, and a technique related to a polarizer using such a dye film. Is reported. However, the compound according to the present invention is water-soluble and can only be processed in an aqueous solution state, so that there is no technical difference with a conventional polarizing film in which polyvinyl alcohol resin is impregnated with iodine in aqueous solution, and heat resistance is weak so that processing by heat is impossible. In addition, there is a disadvantage in that the manufacturing cost is increased by applying a pigment that is more expensive than the polarizing film that is conventionally commercialized.

Therefore, when manufacturing a polarizing film has a performance equivalent to that of the existing polarizing film, it is desired to develop and manufacture a polarizing film capable of mass production while eliminating the problems caused by stretching by eliminating the stretching process.

In order to solve the above problems, the present invention is to provide a method of manufacturing a polarizing film that can be mass-produced while eliminating the problems caused by stretching by omitting the conventional stretching process.

Another object of the present invention to provide a simple process method, to provide a method of manufacturing a polarizing film that provides a function substantially equivalent to the existing polarizing film.

In order to achieve the above object, the present invention comprises the steps of electrospinning the polymer on the rubbing roll to form a nanowire fiber structure; Imparting orientation to the alignment film formed on the base film using the rubbing roll; And it provides a non-oriented dye-based polarizing film manufacturing method comprising the step of coating and curing the dye on the alignment layer.

In addition, the present invention is lead-free, characterized in that the polymer is selected from at least one of polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polystyrene (PS) It provides a new dye-based polarizing film manufacturing method.

In the present invention, the base film is polyester polymer, acrylic polymer, styrene polymer, polycarbonate polymer, polyolefin polymer, amide polymer, imide polymer, sulfone polymer, polyether sulfone polymer, polyether ether Select one or more selected from the group consisting of ketone polymers, polyphenylene sulfide polymers, vinyl alcohol polymers, vinylidene chloride polymers, vinyl butyral polymers, allylate polymers, polyoxymethylene polymers and epoxy polymers. It provides a non-stretch dye dye-based polarizing film production method characterized in that.

In addition, the present invention uses an alignment film composition consisting of a binder resin, a photoinitiator, and a solvent, wherein, based on 100 parts by weight of the binder resin, 10 to 20 parts by weight of a photoinitiator and 300 to 600 parts by weight of a solvent, unstretched dye-based polarized light It provides a film production method.

In addition, the present invention is a monomer, oligomer and prepolymer having a polymerizable unsaturated bond composed of at least one of (meth) acrylate group, ether group, amino group, acryloyloxy group, (meth) acryloyloxy group, urethane group as the binder resin. It provides a method for producing a non-stretch dye dye-based polarizing film comprising at least one of.

In another aspect, the present invention provides a method for producing an unstretched dye-based polarizing film, characterized in that the photoinitiator is selected from at least one of an aminoketone-based photoinitiator, a hydroxyketone-based photoinitiator, a hydroxyalkylphenone-based photoinitiator.

The present invention also provides a method for producing a non-stretch dye-based polarizing film, characterized in that the dye coating comprises a dye, an ultraviolet curable liquid crystal material and a solvent.

In the present invention, the ultraviolet curable liquid crystal material is a monoepoxide compound, a polyether, an ultraviolet curable liquid crystalline acrylate compound, an acrylate compound indicating a discotic liquid crystal, a polyester showing a liquid crystal, polyimide, polyamide, polycar Provided is a method for producing a non-stretch dye-based polarizing film, characterized in that at least one selected from a polymer of carbonate and polyesterimide, and a liquid crystal oligomer exhibiting a nematic or smetic phase.

In another aspect, the present invention provides a method for producing a non-drawn dye-based polarizing film, characterized in that the dye coating further comprises an acrylate-based pressure-sensitive adhesive (PSA).

In another aspect, the present invention provides a non-stretched dye-based polarizing film prepared by the above production method.

The method of manufacturing a non-stretch dye-based polarizing film and a polarizing film prepared therefrom according to the present invention are mixed with a pressure-sensitive adhesive and coated on an optical film and cured to provide a simple process method and solve the problems caused by stretching. Mass production is possible.

In addition, the method of manufacturing a non-stretch dye-based polarizing film according to the present invention and a polarizing film prepared therefrom provide a function substantially equivalent to that of a conventional polarizing film despite being unstretched, and can provide a thinner film than an iodine-based polarizing film. It has an effect.

1 is a cross-sectional view of an unstretched dye-based polarizing film.
Figure 2 shows the manufacturing process of the non-stretch dye-based polarizing film according to an embodiment of the present invention.
3 and 4 show a schematic view of forming a nanowire on the rubbing roll used in the present invention.
Figure 5 is a graph showing the single plate transmittance of the polarizing film prepared in Example 1.
Figure 6 is a graph showing the single plate transmittance of the polarizing film prepared in Comparative Example 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms " about ", " substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation to or in the numerical value of the manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

As used herein, the term "film" is used to mean both films, sheets, and plates having a predetermined width and thickness.

The present inventors use a transparent general-purpose plastic or engineering plastics as a material, using an electrospinning on the surface of the base film to form an alignment layer through a rubbing roll coated with nanowires in the form of fibers, and then coated using a mixed dye By producing an unstretched polarizing film having polarization, eliminating the stretching process performed in the conventional manufacturing process of the polarizing film, the problem of color change according to the stretching ratio, optical anisotropy according to the stretching of the base film, heat shrinkage In addition, the present invention has been completed by providing a polarizing film having excellent optical stability and reliability, processability, and economic efficiency and a polarizing film using the same.

1 is a cross-sectional view of an unstretched dye-based polarizing film, Figure 2 shows a manufacturing process of the unstretched dye-based polarizing film according to an embodiment of the present invention, Figure 3 and Figure 4 is a rubbing roll used in the present invention A schematic diagram of forming nanowires is shown.

The present invention comprises the steps of electrospinning a polymer on a rubbing roll to form nanowires into a fiber structure, imparting orientation to the alignment film formed on the base film using the rubbing roll, and coating and curing the dye on the alignment film Steps.

The polarizing film prepared according to the present invention is a non-stretching polarizing film which omits the stretching process beyond the limit of the polarization function by conventional stretching, and the color change according to the conventional stretching ratio, optical anisotropy according to stretching of the base film, heat shrinkage, etc. The problem is solved and optically stable.

Conventionally, a velvet-shaped cloth in which fibers such as nylon, aramid, rayon, and cotton are applied to the roll surface for rubbing has been used, but it has not exhibited a precise alignment effect due to irregular arrangement of the cloth and foreign matter.

However, in the present invention, a polymer made of any one of polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), and polystyrene (PS) on a roll surface is made of DMF ( Dimethylformamide): It dissolves in 30% by weight of THF (Tetra Hydro Furan) (7: 3 weight ratio) solvent and forms nanowire-like fiber structure through electrospinning. A rubbing roll can be produced.

Referring to Figures 3 and 4, the rubbing roll 100 is installed in close proximity to the nanowire injection port 120 so that the discharged nanowires are wound on the roll so that the linear arrangement is made by centrifugal force. The electrode 110 may be installed inside the rubbing roll 100 so that the nanowire arrangement may be made better. The electrode 110 may be provided with a plurality of electrodes 110 in the axial direction on the outer surface of the roll, and by applying a voltage to the electrode 110 to form an electric field between the electrodes it is possible to uniformly arrange the nanowires along the electric field. .

Therefore, the nanowires discharged from the injection hole 120 may be uniformly arranged by the electric field due to the centrifugal force of the rubbing roll 100 and the voltage applied to the electrode 110 so that the nanowires of the optical film may be formed at uniform intervals.

The base film is used to support the dye-type polarizing film, it may be selected in consideration of transparency, mechanical strength, thermal stability, moisture shielding, isotropy, economics and the like. As an example of such a base film, an anisotropic film such as triacetyl cellulose (TAC) can be used, and polyester polymers such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polymethylmethacrylate as hydrophobic transparent resin films Styrene-type polymers, such as an acryl-type polymer, such as acrylate (PMMA), a polystyrene, and an acrylonitrile- styrene copolymer, a polycarbonate polymer, etc. are mentioned. In addition, polyolefin-based polymers such as polyethylene, polypropylene, cyclo- or norbornene structures, polyolefin-based polymers such as ethylene-propylene copolymers, amide-based polymers such as vinyl chloride-based polymers, nylon and aromatic polyamides, imide-based polymers, Phon polymer, polyether sulfone polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, allylate polymer, polyoxymethylene polymer , Epoxy polymers, blended polymers of the above polymers, acrylic, urethane, acrylic urethane, epoxy, silicone or the like thermosetting or ultraviolet curable resins may be used alone or in combination. Specifically, triacetyl cellulose (TAC) is generally used, and stretched cycloolefin-based and polycarbonate-based films may be used to compensate for the wide viewing angle and color compensation of STN and VA modes.

In addition, triacetyl cellulose coated with a wide viewing angle liquid crystal may be used to improve the viewing angle. In addition, polymethyl methacrylate, polyethylene terephthalate-based film may be preferably used.

The alignment layer of the present invention may be formed by coating a composition including a binder resin, a photoinitiator, and the like on a base film. Spray coating, roll coating, gravure coating, micro-gravure coating, dip coating, flow coating coating) and the like.

The composition for forming the alignment layer preferably comprises 10 to 20 parts by weight of the photoinitiator and 300 to 600 parts by weight of the solvent with respect to 100 parts by weight of the binder resin.

The binder resin may include at least one of a monomer, an oligomer, and a prepolymer having a polymerizable unsaturated bond formed of at least one of a (meth) acrylate group, an ether group, an amino group, an acryloyloxy group, a (meth) acryloyloxy group, and a urethane group. It is preferable to make. More preferably, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylol ethane tri (meth) acrylate, pentaglycerol tri (meth) acrylate It is preferable to use the trifunctional or more than trifunctional polyfunctional acrylate derivative which the dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, etc. were made individually or in mixture.

The photoinitiator varies in the wavelength range of absorption according to the type of initiator, and most of the photoinitiators do not participate in the reaction. There are yellowing type and low yellowing type, and generally absorbs a wavelength of 300 to 360nm, in order to absorb various wavelengths to promote reactivity, two or more kinds of initiators may be used together.

In addition, in the case of a thin coating thickness, the higher the content, the better the reactivity. In the case of a thick coating thickness, the total curing rate increases as the content decreases. The photoinitiator used in the present invention is selected from one or more of an amino ketone-based photoinitiator, a hydroxyketone-based photoinitiator, and a hydroxyalkylphenone-based photoinitiator, thereby inducing a rapid curing reaction to obtain excellent surface curing properties. The content of the photoinitiator is 10 to 20 parts by weight, preferably 12 to 17 parts by weight, more preferably 14 to 16 parts by weight based on 100 parts by weight of the binder resin. If the content is less than 10 parts by weight, there is a problem that the reactivity is lowered, if it exceeds 20 parts by weight, the reactivity is increased, but there is a problem that the surface hardness is lowered.

The solvent used for forming the alignment layer may be an alcohol solvent, an ether solvent, an aromatic solvent, an acetate solvent, a ketone solvent, or a mixture thereof. Preferably water, ethanol, methanol, acetone, methyl ethyl ketone, isopropyl alcohol, chloroform, dichloroethane, tetrachloroethane, tetrachloroethylene, tetrahydrofuran, cyclohexanone, aromatic hydrocarbon, isophorone, butyrolactone, N-methyl pyrrolidone, acetate, lactate and the like can be used alone or in combination. The content of the solvent is 300 to 600 parts by weight, preferably 400 to 500 parts by weight, and more preferably 420 to 470 parts by weight based on 100 parts by weight of the binder resin. If the content is less than 300 parts by weight, there is a problem in that the coating is difficult to be performed smoothly because the viscosity is greater than 600 parts by weight, and there is a problem in that a coating layer having an appropriate thickness cannot be formed to exhibit a function.

The alignment film coated on the base film is dried in an atmosphere of 25 to 75 ℃ to remove the solvent remaining in the composition, the drying time is preferably 60 seconds to 100 seconds. After the alignment layer coating layer is dried, ultraviolet rays are irradiated again to cure the coating layer. The amount of ultraviolet light to be irradiated is preferably 300 to 500 mJ / cm 2, and the wavelength band is preferably 350 to 400 nm long wavelength ultraviolet light. The ultraviolet curing time is preferably 60 to 120 seconds.

The electrospinning may be used to orient the nanowires in a predetermined direction on the surface of the alignment film coated on the base film in a later step using a rubbing roll formed in the form of fibers. That is, the alignment film is oriented between the rubbing rolls so that the liquid crystals are arranged in a predetermined direction on the surface of the alignment film so that the surface of the alignment film is aligned in a constant direction.

In addition, after the alignment layer is formed, a dye coating is performed on the alignment layer. The dye coating may coat a liquid crystal mixed solution including a dye, an ultraviolet curable liquid crystal material, and a solvent.

The mixed dye may be used by selecting cyan, magenta, and yellow dyes, and the mixed solution may be formed by a combination of specific pigments to control visible light transmittance in a specific specific area and to block yellow light and near infrared rays. Do it.

As an ultraviolet curable liquid crystal material used for the dye coating of this invention, a monoepoxide compound, a polyether, an ultraviolet curable liquid crystalline acrylate compound, the acrylate compound which shows a discotic liquid crystal, the polyester which shows liquid crystal, a polyimide, Polymers of polyamides, polycarbonates and polyester imides, and liquid crystal oligomers showing nematic or smectic phases and the like are used alone or in combination. Preferably, a material showing nematic liquid crystallinity is used.

In addition, by mixing the pressure-sensitive adhesive with the dye can impart the adhesion of the polarizing film to simplify the process. The pressure-sensitive adhesive mixed with the dye may use an acrylate pressure sensitive adhesive (PSA) to reduce transmittance, reduce haze, and provide high elasticity and chemical resistance. 2 to 5% by weight of a leveling agent may be added to make the coating even. In addition, 0.17% by weight of a thermosetting agent relative to the weight of the adhesive may be added for rapid curing of the coating solution.

The manufacturing method according to the present invention provides an almost equivalent function to the existing polarizing film despite the non-stretching, it is effective to provide a thinner film than the iodine-based polarizing film.

Hereinafter, embodiments of the present invention will be described in detail.

Example  One

An alignment film was formed on the base film using a rubbing roll electrospun using polystyrene (PS). 15 parts by weight of the photoinitiator and 500 parts by weight of the solvent were included with respect to 100 parts by weight of the binder resin, pentaerythritol tri (meth) acrylate was used as the binder resin, an amino ketone-based photoinitiator was used as the photoresist, and the solvent was ethanol. Used.

Next, for dye coating, the ratio of nematic liquid crystal, cyan dye, magenta dye, and yellow dye is mixed at 3: 4: 2: 1, and 10% by weight of the mixed dye is coated on the alignment layer on the alignment layer for 2 minutes at 110 ° C. After drying, the single plate transmittance, orthogonal transmittance, and polarization degree of the completed polarizing film were measured. The change of the single plate transmittance according to the wavelength of 400 ~ 700nm is shown in the graph of FIG.

Comparative example  One

The polyvinyl alcohol (PVA) film having a thickness of 100 um was stretched four times in an atmosphere of 35 ° C iodine solution, and then dried at 75 ° C for 15 minutes to obtain a polarizer. The TAC film was fixed to both sides of the polarizer using an adhesive, and after completing the polarizing film having adhesiveness using an acrylic polymer, single plate transmittance, orthogonal transmittance, and polarization degree of the polarizing film were measured. The change in single plate transmittance according to the wavelength of 400 ~ 700nm is shown in the graph of FIG.

The thickness, average single plate transmittance, average orthogonal transmittance, and polarization degree of the polarizing films prepared in Example 1 and Comparative Example 1 are shown in Table 1 below.

Thickness (㎛) Average Plate Transmittance Average ortho transmittance % Polarization Example 1 85 43.20 0.11 99.74 Comparative Example 1 140 43.41 0.09 99.97

Here, average single plate transmittance and average orthogonal transmittance show the average transmittance between 380 nm and 800 nm.

In addition, the measurement of polarization degree is computed as follows.

Degree of polarization = [(Tp-Tc) / (Tp + Tc)] ^1/2 * 100 (%)

(Tp is single plate transmittance and Tc is orthogonal transmittance)

As a result of the measurement, the polarizing film prepared according to the embodiment of the present invention has no significant difference in single plate transmittance, orthogonal transmittance, and polarization degree as compared to the iodine polarizing film, and it is economical because the product can be produced without stretching. In addition, the thickness of the film is rather reduced to enable a thinner display device.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

Claims (10)

Electrospinning the polymer onto the rubbing roll to form nanowires into a fibrous structure;
Imparting orientation to the alignment film formed on the base film using the rubbing roll; And
A dye-free dye-based polarizing film manufacturing method comprising the step of coating and curing the dye on the alignment layer. The method of claim 1,
The polymer is unstretched dye-based polarized light characterized in that at least one selected from polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polystyrene (PS) Film manufacturing method. The method of claim 1,
The base film may be a polyester polymer, an acrylic polymer, a styrene polymer, a polycarbonate polymer, a polyolefin polymer, an amide polymer, an imide polymer, a sulfone polymer, a polyether sulfone polymer, a polyether-ether ketone polymer, At least one selected from the group consisting of polyphenylene sulfide polymer, vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, allylate polymer, polyoxymethylene polymer, and epoxy polymer Undrawn dye-based polarizing film production method. The method of claim 1,
The alignment layer is a binder resin, a photoinitiator, using an alignment layer composition consisting of a solvent, a method for producing a non-stretch dye dye-based polarizing film comprising 10 to 20 parts by weight of the photoinitiator and 300 to 600 parts by weight of the solvent with respect to 100 parts by weight of the binder resin. The method of claim 4, wherein
The binder resin may include at least one of a monomer, an oligomer, and a prepolymer having a polymerizable unsaturated bond formed of at least one of a (meth) acrylate group, an ether group, an amino group, an acryloyloxy group, a (meth) acryloyloxy group, and a urethane group. Method for producing a non-stretch dye-based polarizing film, characterized in that made. The method of claim 4, wherein
Wherein the photoinitiator is selected from at least one of an amino ketone-based photoinitiator, a hydroxyketone-based photoinitiator, and a hydroxyalkylphenone-based photoinitiator. The method of claim 1,
The dye coating is a non-stretch dye-based polarizing film manufacturing method comprising a dye, an ultraviolet curable liquid crystal material and a solvent. The method of claim 7, wherein
The ultraviolet curable liquid crystal material may be a monoepoxide compound, a polyether, an ultraviolet curable liquid crystalline acrylate compound, an acrylate compound representing a discotic liquid crystal, a polyester exhibiting liquid crystallinity, a polyimide, a polyamide, a polycarbonate, and a poly A method for producing an unstretched dye-based polarizing film, characterized in that at least one of esterimide and a polymer of a liquid crystal oligomer exhibiting a nematic or smetic phase is selected. The method of claim 7, wherein
A dye-free dye-based polarizing film production method characterized in that the dye coating further comprises an acrylate-based pressure-sensitive adhesive (PSA). An unstretched dye-based polarizing film prepared by the method according to any one of claims 1 to 8.

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