KR20160023429A - Preparing method for polarizer - Google Patents
Preparing method for polarizer Download PDFInfo
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- KR20160023429A KR20160023429A KR1020140109837A KR20140109837A KR20160023429A KR 20160023429 A KR20160023429 A KR 20160023429A KR 1020140109837 A KR1020140109837 A KR 1020140109837A KR 20140109837 A KR20140109837 A KR 20140109837A KR 20160023429 A KR20160023429 A KR 20160023429A
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- polarizer
- film
- crosslinking
- boric acid
- iodide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
Abstract
More particularly, the present invention relates to a method for producing a polarizer, which comprises swelling, dyeing, crosslinking, complementing, and first stretching a film for forming a polarizer, wherein the polarizer- To a method of producing a polarizer capable of producing a polarizer in which color change is minimized even when exposed to a high temperature condition for a long time.
Description
The present invention relates to a method for producing a polarizer.
Polarizing plates used in various image display devices such as a liquid crystal display (LCD), an electroluminescence (EL) display, a plasma display (PDP), a field emission display (FED) and an OLED are generally made of polyvinyl alcohol alcohol, PVA) film comprises a polarizer in which an iodine compound or a dichroic polarizing material is adsorbed and oriented, a polarizer protective film is laminated on one side of the polarizer, and a polarizer protective film, a liquid crystal cell Layer structure in which a pressure-sensitive adhesive layer and a release film are laminated in this order.
The polarizer constituting the polarizing plate is required to have a high transmittance and a high degree of polarization in order to provide an image excellent in color reproducibility by being applied to an image display apparatus. In addition, as the application of the flat panel display device to various fields of the flat panel display device is expanded and the tendency of enlargement becomes clearer, various image display devices such as a liquid crystal display device may be used at a high temperature for a long time, And the demand for improvement in durability has also been increased. As a result, the conditions for the performance of the polarizer have become very strict. In addition, image display devices having characteristics suitable for various environments and applications are currently in demand, and optical durability including color change under high temperature and high humidity conditions and high contrast through high transmission are required.
Korean Patent Laid-Open Publication No. 2009-70085 discloses a method of manufacturing a polarizer, but fails to provide an alternative to the above problem.
It is an object of the present invention to provide a method for producing a polarizer with improved color durability.
1. A polarizer-forming film comprising a step of swelling, dyeing, crosslinking, complementing, and first stretching,
And the polarizer-forming film is secondly stretched at a stretching ratio of 1.01 to 1.1 times in the complementary coloring step.
2. The method of producing a polarizer according to 1 above, wherein the dyeing step comprises a boric acid compound.
3. The method of producing a polarizer according to 2 above, wherein the boric acid compound is contained in an amount of 0.3 to 5% by weight based on the total weight of the dyeing solution.
4. The method of producing a polarizer according to 1 above, wherein said first stretching is performed in at least one step selected from the group consisting of swelling, dyeing and crosslinking.
5. The method of producing a polarizer according to item 1 above, wherein the concentration of the boric acid compound in the complementary solution of the complementary coloring step is lower than the concentration of the boric acid compound in the crosslinking solution.
6. The polarizer according to item 1, wherein the boric acid compound concentration in the crosslinking solution and the boric acid compound concentration ratio in the complementary colorant are 1: 0.4 to 0.8.
7. The method of producing a polarizer according to 1 above, wherein the iodide concentration in the complementary liquid of the complementary color step is lower than the concentration of iodide in the cross-linking liquid.
8. The process for producing a polarizer according to 1 above, wherein the iodide concentration in the crosslinking liquid and the iodide concentration ratio in the complementary colorant are 1: 0.2 to 0.6.
9. A polarizer produced by the method according to any one of the above 1 to 8.
The method of the present invention can produce a polarizer with remarkably improved color durability. Accordingly, even when exposed to a high temperature condition for a long time, the color change can be minimized.
The method of the present invention can produce a polarizer excellent in the degree of polarization.
The present invention relates to a polarizer-forming film comprising a step of swelling, dyeing, crosslinking, complementing, and first stretching a polarizer-forming film, and the polarizer-forming film is secondarily stretched at a stretching ratio of 1.01 to 1.1 times in the complementary- To a method of manufacturing a polarizer capable of producing a polarizer with minimized color change even when exposed.
Hereinafter, the present invention will be described in detail.
The polarizer producing method of the present invention includes a step of swelling, dyeing, crosslinking, complementing, and first stretching a film for forming a polarizer.
In the present invention, the second stretching of the polarizer-forming film is performed in the complementary step in the production process of the polarizer.
Generally, in the step of dyeing a polarizing film during the production process of a polarizer, a complex between the polymer constituting the polarizing film and the dichroic material is formed and fixed at the crosslinking step. Only the crosslinking step is carried out and the polarizing film is washed There is a problem that the degree of orientation of the dichroic material complex is low and stability is lowered, the color of the polarizer is changed, and the durability is lowered.
However, the present invention enhances the degree of orientation of the dichroic substance complex by performing the complementary step after the crosslinking step and also by stretching the polarizing film (second stretching) in the complementary step. Thus, the color change of the polarizer can be suppressed and the durability can be remarkably improved.
The second stretching is performed at a stretching ratio of 1.01 to 1.1 times. If the stretching ratio is less than 1.01 times, the effect of improving the degree of orientation of the dichroic substance complex is insignificant. If the stretching ratio is more than 1.1 times, the film may be broken by excessive stretching. Preferably 1.02 to 1.08 times the stretching ratio.
Hereinafter, one embodiment of the polarizer manufacturing method of the present invention will be described in more detail.
The number of repetitions of each production step of the polarizer of the present invention, the process conditions, and the like are not particularly limited as long as they do not deviate from the object of the present invention, and the stretching step may be performed in an independent step or may be performed in one step or more of swelling, Or may be performed simultaneously.
The polarizer-forming film is not particularly limited as long as it is a film which can be dyed with a dichroic substance, that is, iodine or the like, for example, a polyvinyl alcohol film, a partially saponified polyvinyl alcohol film; A hydrophilic polymer film such as a polyethylene terephthalate film, an ethylene-vinyl acetate copolymer film, an ethylene-vinyl alcohol copolymer film, a cellulose film, a partially saponified film thereof and the like; Or a dehydrated polyvinyl alcohol film, a dehydrochloric acid-treated polyvinyl alcohol film, and the like. Of these, a polyvinyl alcohol-based film is preferable because it has an excellent effect of enhancing the uniformity of the degree of polarization in the plane and is excellent in dye affinity for iodine.
<Swelling step>
The swelling step is carried out by immersing the unstretched polarizer forming film in a swelling tank filled with a swelling aqueous solution before dyeing to remove impurities such as dust and anti-blocking agent deposited on the surface of the polarizing film, Is a step for improving physical properties of the polarizer by swelling to improve the drawing efficiency and to prevent uneven dyeing.
As the swelling aqueous solution, water (pure water, deionized water) can be used alone, and a small amount of glycerin or potassium iodide can be added to improve the processability of the polymer film.
Glycerin and potassium iodide, the content thereof is not particularly limited and may be 5 wt% or less and 10 wt% or less, respectively, of the total weight of the aqueous swelling solution.
The temperature of the swelling bath is not particularly limited and may be, for example, 20 to 45 캜, preferably 20 to 40 캜. When the temperature of the swelling bath is within the above range, the stretching and dyeing efficiency is excellent thereafter, and expansion of the film due to excessive swelling can be prevented.
The execution time (swelling tank immersion time) of the swelling step is not particularly limited, and may be, for example, 180 seconds or less, preferably 90 seconds or less. When the swelling bath immersion time is within the above range, excessive swelling and saturation can be suppressed to prevent breakage due to softening of the polarizer forming film and uniformity of adsorption of iodine in the dyeing step to improve the degree of polarization .
The swelling step and the first stretching step may be performed together. In this case, the stretching ratio may be about 1.1 to 3.5 times, preferably 1.5 to 3.0 times. Wrinkles may occur when the stretching ratio is less than 1.1 times, and initial optical characteristics may be lowered when the stretching ratio is more than 3.5 times.
<Stage of dyeing>
The dyeing step is a step of dipping the film for forming a polarizer into a dyeing bath filled with a dyeing solution containing a dichroic substance, for example, iodine to adsorb iodine to the polarizing film.
The dyeing solution may further comprise water, a water-soluble organic solvent or a mixed solvent thereof and iodine. The concentration of iodine in the dyeing solution may be 0.4 to 400 mmol / L, preferably 0.8 to 275 mmol / L, more preferably 1 to 200 mmol / L.
The dyeing solution may further contain iodide as a dissolution aid for improving the dyeing efficiency.
The kind of iodide is not particularly limited and includes, for example, potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, titanium iodide and the like , And potassium iodide is preferred in view of high solubility in water. These may be used alone or in combination of two or more.
The content of the iodide is not particularly limited and may be 0.01 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the dyeing solution.
The dyeing solution used in the dyeing step of the present invention may further comprise a boric acid compound. By including the boric acid compound in the dyeing solution, the retention time of the boric acid compound before the crosslinking reaction can be improved to increase the rate of formation of the dichroic complex in the film for forming a polarizer. Accordingly, the color durability of the polarizer can be improved, and the degree of polarization can be improved.
The boric acid compound in the dyeing solution is included to have a higher concentration than the boric acid compound added to the crosslinking solution of the crosslinking step to be performed later.
The concentration of the boric acid compound in the dyeing solution is not particularly limited, but may be, for example, 0.3 to 5% by weight, preferably 0.5 to 3% by weight, based on the total weight of the dyeing solution. If the concentration of the boric acid compound in the dyeing solution is less than 0.3 wt%, the effect of increasing the iodine complex formation is reduced. If the concentration of the boric acid compound is more than 5 wt%, cutting may occur due to stress increase.
The kind of the boric acid compound is not particularly limited. For example, the boric acid compound includes boric acid, sodium borate, potassium borate and lithium borate. These may be used alone or in combination of two or more.
The temperature of the dye bath is not particularly limited and may be, for example, from 5 to 42 캜, preferably from 10 to 35 캜.
The time for immersing the film for forming a polarizer in the dye bath is not particularly limited and may be, for example, 1 to 20 minutes, and preferably 2 to 10 minutes.
The first stretching step may be performed together with the dyeing step. In this case, the stretching ratio may be 1.01 to 2.0 times, preferably 1.1 to 1.8 times.
It is also preferable that the cumulative stretching ratio of the polarizer up to the swelling and first stretching step is 1.2 to 4.0 times. If the cumulative stretching ratio is less than 1.2 times, wrinkles may occur in the film. If the cumulative stretching ratio is more than 4.0 times, initial optical characteristics may be lowered.
<Bridging stage>
The crosslinking step is a step of immersing the stained polarizer-forming film in the crosslinking solution so as to fix the adsorbed iodine molecule so that the dyeability due to the physically adsorbed iodine molecule is not lowered by the external environment.
The crosslinking solution used in the crosslinking step of the present invention includes a boric acid compound. The crosslinking solution contains a boric acid compound to improve the crosslinking efficiency, thereby suppressing the occurrence of wrinkles in the film during the process, and to improve the optical properties by forming an alignment of the dichroic substance.
Dichromatic dyes are rarely eluted in a humid environment, but when iodine is unstable, iodine molecules tend to dissolve or sublimate depending on the environment, and sufficient crosslinking reaction is required.
The crosslinking step according to the present invention can be carried out in the first crosslinking step and the second crosslinking step, and the boric acid compound can be included in the crosslinking solution used in at least one of the crosslinking steps.
The concentration of the boric acid compound in the crosslinking solution is not particularly limited. For example, 1 to 10% by weight, preferably 2 to 6% by weight, based on the total weight of the crosslinking solution. When the concentration of the boric acid compound in the crosslinking solution is less than 1% by weight, the crosslinking effect is reduced and the rigidity of the film may be deteriorated. If it exceeds 10% by weight, the crosslinking may occur due to excessive crosslinking.
The boric acid compound may be the same as that used in the dyeing step.
The crosslinking solution of the present invention may contain an organic solvent mutually soluble together with water and water used as a solvent and may further contain a small amount of iodide in order to prevent the uniformity of the degree of polarization in the plane of the polarizer and the desorption of the iodine .
The iodide may be the same as that used in the dyeing step. The concentration of the iodide is not particularly limited and may be, for example, 0.05 to 15% by weight, preferably 0.5 to 11% by weight %. When the concentration of the iodide in the crosslinking bath satisfies the above range, the iodide ions adsorbed in the dyeing step may escape from the film, or the iodide ions contained in the crosslinking liquid may be prevented from penetrating into the film, thereby suppressing the change of the transmissivity.
The temperature of the crosslinking bath is not particularly limited, but may be, for example, 20 to 70 캜, preferably 40 to 60 캜.
The time for immersing the film for forming a polarizer in the crosslinking tank is not particularly limited and may be, for example, from 1 second to 15 minutes, preferably from 5 seconds to 10 minutes.
The first stretching step may be performed together with the crosslinking step. In this case, the stretching ratio of the first crosslinking step may be 1.4 to 3.0 times, preferably 1.5 to 2.5 times. The stretching ratio of the second crosslinking step may be 1.01 to 2.0 times, preferably 1.2 to 1.8 times.
The cumulative stretching ratio of the first crosslinking step and the second crosslinking step may be 1.5 to 5.0 times, preferably 1.7 to 4.5 times. If the cumulative stretching ratio is less than 1.5 times, the synergistic effect of crosslinking efficiency may be insufficient. If the cumulative stretching ratio is more than 5.0 times, excessive stretching may cause breakage of the film and production efficiency may be lowered.
<First Drawing Step>
The first stretching step may be carried out with at least one of the swelling step, the dyeing step and the crosslinking step, as described above, or may be carried out in air or an inert gas while transferring the film after the steps, Or may be performed in an independent stretching step using a stretching bath. Alternatively, the unvulcanized polyvinyl alcohol film may be stretched in air or an inert gas before the swelling step, and then the film may be subjected to swelling, dyeing, crosslinking, washing and drying steps.
The stretching may be carried out in one step or in two or more steps, but is preferably carried out in two or more steps. The stretching may be carried out by a method such as setting the difference in peripheral speed of the nip roll or the like. Also, like the swelling step, the expander roll, the spiral roll, the crown roll, the cross guider, the bend bar, and the like can be installed in the bath and / or the bath door.
<Complementary phase>
The complementary color step is a step of adjusting the color by immersing the film that has undergone the crosslinking step in a complementary solution containing a boric acid compound and iodide.
The present invention can improve the stability by enhancing the degree of orientation of the dichroic substance complex by performing the second stretching of the film for polarizer formation in the complementary coloring step and thus the polarizer produced by the method of the present invention can be used even after long- The decomposition of the complex is minimized and the color durability is excellent.
The second stretching is performed at a stretching ratio of 1.01 to 1.1 times. If the stretching ratio is less than 1.01 times, the effect of improving the degree of orientation of the dichroic substance complex is insignificant. If the stretching ratio is more than 1.1 times, the film may be broken by excessive stretching.
The total cumulative stretching ratio by the first and second stretching of the present invention is preferably 4.0 to 7.0 times, and in the present specification, the " cumulative stretching ratio " means a value obtained by multiplying the stretching ratio of each step.
The complementary liquid used in the complementary step of the present invention includes a boric acid compound.
The boric acid compound may be the same as that used in the dyeing step.
The concentration of the boric acid compound in the complementary colorant is not particularly limited. For example, 1 to 10% by weight, and preferably 2 to 6% by weight based on the total weight of the complementary coloring liquid. If the concentration of the boric acid compound in the complementary coloring solution is less than 1 wt%, the iodine alignment can not be improved and the effect of suppressing color change and improving durability may be insignificant. If the concentration is more than 10 wt% So that stretching is difficult and the film may be broken.
Preferably, the concentration of the boric acid compound in the complementary liquid of the present invention is lower than the concentration of the boric acid compound in the cross-linking liquid.
Since the boric acid compound plays a role in fixing the adsorbed iodine molecule in the crosslinking solution, when a large amount of the boric acid compound is contained, a large tension is generated in stretching the film for forming a polarizer. In the present invention, the second drawing is performed in the complementary color step, and it is preferable that the boron compound is contained in a small amount in order to reduce the tension.
The concentration ratio is not particularly limited. For example, the boric acid compound concentration in the crosslinking solution and the boric acid compound concentration in the complementary color solution may have a ratio of 1: 0.4 to 0.8. If the concentration ratio is less than 1: 0.4, the iodine alignment can not be improved and the effect of suppressing color change and improving durability may be insignificant. When the concentration ratio is more than 1: 0.8, So that stretching is difficult and the film may be broken.
The complementary liquid of the present invention may contain an organic solvent that is mutually soluble together with water and water used as a solvent and may contain a small amount of iodide in order to prevent the uniformity of the degree of polarization in the plane of polarizers and the desorption of iodine .
The iodide may be the same as that used in the dyeing step and the crosslinking step. The concentration of the iodide is not particularly limited and may be, for example, 0.05 to 15% by weight, preferably 0.5 To 11% by weight. When the concentration of the iodide of the complementary color liquid satisfies the above range, unadsorbed iodide ions can be adsorbed to the film in the dyeing and crosslinking step, and the iodide ion contained in the complementary color liquid increases penetration into the film, The transmittance can be adjusted.
Preferably, the iodide concentration in the complementary liquid of the present invention is lower than the concentration of iodide in the cross-linking liquid.
In the crosslinking solution, iodide serves to prevent the iodide ions adsorbed in the dyeing step from escaping from the film, but when the iodide is contained in a large amount in the complementary liquid at a level similar to that of the crosslinking liquid, The complex may be decomposed to lower the durability of the polarizer.
The concentration ratio is not particularly limited. For example, the iodide concentration in the crosslinking liquid and the iodide concentration in the complementary colorant may have a ratio of 1: 0.2 to 0.6. If the concentration ratio is less than 1: 0.2, color control can not be performed. If the concentration ratio is more than 1: 0.6, prolonged exposure to heat at a high temperature may degrade the durability of the iodine complex .
The temperature of the complementary color bath is 20 to 70 캜, and the immersion time of the polyvinyl alcohol-based film in the sub-tones may be 1 second to 15 minutes, preferably 5 seconds to 10 minutes.
<Washing step>
If necessary, the polarizer of the present invention may further include a washing step after completion of complementary coloring.
In the washing step, the complementary polarizer-forming film is immersed in a water bath filled with a washing liquid to remove unnecessary residues attached to the polarizer-forming film in the previous steps.
The aqueous solution for washing may be water (deionized water), and iodide may be further added thereto. As the iodide, those same as those used in the dyeing step can be used, and among them, sodium iodide or potassium iodide is preferably used. The content of iodide is not particularly limited and may be, for example, 0.1 to 10 parts by weight, preferably 3 to 8 parts by weight, based on the total weight of the aqueous solution for washing.
The temperature of the water bath is not particularly limited and may be, for example, 10 to 60 ° C, and preferably 15 to 40 ° C.
The wash step may be omitted and may be performed each time previous steps such as dyeing step, crosslinking step, first stretching step, or complementary step are completed. It may also be repeated one or more times, and the number of repetition is not particularly limited.
<Drying step>
The drying step is a step of drying the washed polarizer forming film and further improving the orientation of molecules of iodine dissolved in the necking by drying to obtain a polarizer excellent in optical characteristics.
As the drying method, natural drying, air drying, heat drying, microwave drying, hot air drying and the like can be used. Recently, microwave treatment for activating and drying only water in the film has been newly used. Treatment is mainly used.
The temperature at the time of hot air drying is not particularly limited, but it is preferably carried out at a relatively low temperature in order to prevent deterioration of the polarizer. For example, it may be 20 to 90 ° C, preferably 80 ° C or less, Or less.
The execution time of the hot air drying is not particularly limited, and may be, for example, 1 to 10 minutes.
The present invention also provides a polarizing plate in which a protective film is laminated on at least one surface of a polarizer manufactured by the above method.
The type of the protective film is not particularly limited as long as it is a film excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, etc. Specific examples thereof include polyester type such as polyethylene terephthalate, polyethylene isophthalate and polybutylene terephthalate Suzy; Cellulose-based resins such as diacetylcellulose and triacetylcellulose; Polycarbonate resin; Polyacrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymer; Polyolefin resins such as polyethylene, polypropylene, cycloolefins or norbornene structures, polyolefins and ethylene propylene copolymers; Polyamide resins such as nylon and aromatic polyamide; Imide resin; Polyether sulfone type resin; Sulfone based resin; Polyether ketone resin: a polyphenylene sulfide resin; Vinyl alcohol-based resin; Vinylidene chloride resins; Vinyl butyral resin; Allylate series resin; Polyoxymethylene type resin; Epoxy resin, and the like, and a film composed of the blend of the thermoplastic resin may also be used. Further, a film made of a thermosetting resin such as (meth) acrylic, urethane, epoxy, or silicone or a film made of an ultraviolet curable resin may be used. Among them, a cellulose-based film having a surface saponified (saponified) by alkali or the like is preferable in consideration of polarization characteristics or durability. Further, the protective film may have the function of the optical layer described below.
The structure of the polarizing plate is not particularly limited, and various kinds of optical layers capable of satisfying the required optical characteristics may be laminated on the polarizer. For example, a structure in which a protective film for protecting a polarizer is laminated on at least one side of a polarizer; A structure in which a surface treatment layer such as a hard coating layer, an antireflection layer, an anti-adhesion layer, a diffusion prevention layer, and an anti-glare layer is laminated on at least one surface of a polarizer or on a protective film; Or a structure in which an alignment liquid crystal layer or another functional film is laminated on at least one surface of the polarizer or on the protective film to compensate for the viewing angle. Further, it is also possible to use an optical film such as a polarization conversion device used for forming various image display devices, a retardation film including a reflector, a half-transparent plate, a half-wave plate or a quarter- A plate, a viewing angle compensating film, and a luminance improving film may be laminated with an optical layer. More specifically, a polarizing plate having a structure in which a protective film is laminated on one side of a polarizer, includes: a reflective polarizing plate or a transflective polarizing plate in which a reflector or a transflective reflector is laminated on a laminated protective film; An elliptic or circular polarizer in which a retarder is stacked; A wide viewing angle polarizer in which a viewing angle compensation layer or a viewing angle compensation film is laminated; Or a polarizing plate in which a brightness enhancement film is laminated.
Such a polarizing plate is applicable not only to a general liquid crystal display but also to various image display devices such as an electroluminescent display device, a plasma display device, and a field emission display device.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the invention and are not intended to limit the scope of the claims. It will be apparent to those skilled in the art that such variations and modifications are within the scope of the appended claims.
Examples and Comparative Examples
(1) Example 1
A transparent unoriented polyvinyl alcohol film (PE60, manufactured by KURARAY Co.) having a degree of saponification of 99.9% or more was immersed in water (deionized water) at 25 DEG C for 1 minute and 20 seconds to swell, followed by 1.25 mM / L of iodine and 1.25% And 0.3% by weight of boric acid was dipped in an aqueous solution for dyeing at 30 DEG C for 2 minutes and 30 seconds. At this time, stretching was performed at a stretching ratio of 1.56 times and 1.64 times at the swelling and dyeing steps, respectively, and the stretching ratio was increased to 2.56 times at the dyeing bath. Subsequently, the film was stretched at a drawing ratio of 1.7 times while immersing it in a crosslinking aqueous solution at 56 ° C containing 13.9% by weight of potassium iodide and 3% by weight of boric acid for 26 seconds (first crosslinking step) and crosslinking. Thereafter, the substrate was immersed in a crosslinking aqueous solution at 56 ° C containing 13.9% by weight of potassium iodide and 3% by weight of boric acid for 20 seconds (second crosslinking step) and stretched at a stretching ratio of 1.34 times while crosslinking. Then, it was stretched by 1.01 times while immersing for 10 seconds in a complementary color aqueous solution at 40 캜 containing 5% by weight of potassium iodide and 2% by weight of boric acid.
At this time, the total cumulative stretching ratio of the swelling, dyeing, crosslinking and complementary phases was set to be six times. After the crosslinking was completed, the polyvinyl alcohol film was dried in an oven at 70 DEG C for 4 minutes to prepare a polarizer.
A triacetylcellulose (TAC) film was laminated on both sides of the prepared polarizer to prepare a polarizing plate.
(2) Examples 2 to 11 and Comparative Examples 1 to 4
A polarizing plate was prepared in the same manner as in Example 1, except that the concentrations of the dyeing boric acid, the crosslinking solution, the potassium iodide and the boric acid concentration of the complementary color solution, and the boehmite stretching ratio shown in Table 1 below were adjusted.
(weight%)
(weight%)
(weight%)
(weight%)
(weight%)
Test Example
The physical properties of the polarizers prepared in the above Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 2 below.
1. Optical characteristics (polarization degree, transmittance, A700, A480)
The prepared polarizer was cut into a size of 4 cm x 4 cm and the transmittance was measured using an ultraviolet-visible light spectrometer (V-7100, manufactured by JASCO). At this time, the polarization degree is defined by the following equation (1). Note that it is important to note that the degree of polarization of 0.001 also greatly affects the contrast ratio. When the degree of polarization is less than 99.990, the contrast ratio is lowered, and it becomes difficult to realize real black.
[Equation 1]
The degree of polarization (P) = [(T 1 - T 2 ) / (T 1 + T 2 )] 1/2
(Wherein T 1 is the parallel transmittance obtained when the pair of polarizers are arranged in parallel with the absorption axis, and T 2 is the orthogonal transmittance obtained when the pair of polarizers are arranged so that the absorption axes are perpendicular to each other)
&Quot; (2) "
A 700 = - Log 10 {(T MD, 700 T TD, 700 ) / 10000}
(Wherein T MD, 700 is a parallel transmittance at a wavelength of 700 nm obtained when a pair of polarizing plates are arranged in parallel with the absorption axes, and T TD, 700 indicates a state in which the pair of polarizers is orthogonal to the absorption axis Lt; RTI ID = 0.0 > 700nm < / RTI > wavelength)
&Quot; (3) "
A480 = - Log 10 {(T MD, 480 * T TD, 480 ) / 10000}
(Wherein T MD, 480 is a parallel transmittance at a wavelength of 480 nm obtained when a pair of polarizing plates are arranged in parallel with the absorption axes, and T TD, 480 represents a pair of polarizers in a state of orthogonal absorption axes Which is the orthogonal transmittance at the wavelength of 480 nm obtained when it is placed.
High absorbance values for A700 and A480 indicate high PVA-I5 and I3 complexes and high degree of polarization.
2. Evaluation of heat resistance
The spectral transmittance? (?) Before and after leaving the polarizing plate prepared in Examples and Comparative Examples at 105 占 폚 for 30 minutes was measured with a spectrophotometer (V7100, manufactured by Nippon Bunko K.K.), and the orthogonal spectral transmittance spectrum was obtained therefrom. A700 represented by the following formula (2) was obtained.
&Quot; (4) "
After heating, A700 = - Log 10 {(T MD, 700 T TD, 700 ) / 10000}
(Wherein T MD, 700 is a parallel transmittance at a wavelength of 700 nm obtained when a pair of polarizing plates are arranged in parallel with the absorption axes, and T TD, 700 indicates a state in which the pair of polarizers is orthogonal to the absorption axis Lt; / RTI > at a wavelength of 700 nm).
After the heat resistance evaluation, the presence or absence of the rusting of the polarizing plate was confirmed by visual observation.
When the A700 is 2.3 or less after heat-resisting, a reddish phenomenon can be observed when observing the polarizing plate. This means that the PVA-I5 complex content of the region absorbing light of 600 nm or more is decreased.
(%)
Whether
With reference to the above table, the polarizers produced by the methods of Examples 1 to 14 exhibited excellent optical characteristics, exhibited high absorbance even after the heat resistance test, and no side-effect phenomenon occurred.
However, the polarizers produced by the methods of Comparative Examples 1 to 3 were inferior in optical characteristics and had a reddish phenomenon due to the heat resistance test. In the case of Comparative Example 4, the film was broken at the time of stretching in the sub-color tones.
Claims (9)
And the polarizer-forming film is secondly stretched at a stretching ratio of 1.01 to 1.1 times in the complementary coloring step.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140109837A KR20160023429A (en) | 2014-08-22 | 2014-08-22 | Preparing method for polarizer |
| CN201580044385.4A CN106662696A (en) | 2014-08-22 | 2015-08-20 | Method for manufacturing polarizer |
| JP2016544252A JPWO2016027864A1 (en) | 2014-08-22 | 2015-08-20 | Manufacturing method of polarizer |
| PCT/JP2015/073413 WO2016027864A1 (en) | 2014-08-22 | 2015-08-20 | Method for manufacturing polarizer |
| KR1020177007333A KR20170045265A (en) | 2014-08-22 | 2015-08-20 | Method for manufacturing polarizer |
| TW104127299A TW201613992A (en) | 2014-08-22 | 2015-08-21 | Method for producing polarizer |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020140109837A KR20160023429A (en) | 2014-08-22 | 2014-08-22 | Preparing method for polarizer |
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| KR20160023429A true KR20160023429A (en) | 2016-03-03 |
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| KR1020177007333A KR20170045265A (en) | 2014-08-22 | 2015-08-20 | Method for manufacturing polarizer |
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| KR1020177007333A KR20170045265A (en) | 2014-08-22 | 2015-08-20 | Method for manufacturing polarizer |
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| JP (1) | JPWO2016027864A1 (en) |
| KR (2) | KR20160023429A (en) |
| CN (1) | CN106662696A (en) |
| TW (1) | TW201613992A (en) |
| WO (1) | WO2016027864A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2018025765A (en) * | 2016-07-29 | 2018-02-15 | 住友化学株式会社 | Optical laminate |
| JP2018025764A (en) * | 2016-07-29 | 2018-02-15 | 住友化学株式会社 | Optical laminate |
| CN107987213B (en) * | 2017-12-28 | 2020-07-21 | 深圳市华星光电技术有限公司 | Polarizing film material and preparation method thereof, polarizing film and preparation method thereof |
| EP3670146B1 (en) * | 2018-12-21 | 2023-04-12 | Essilor International | Method and system for producing a gradient polarisation film |
| KR20200091741A (en) * | 2019-01-23 | 2020-07-31 | 동우 화인켐 주식회사 | Polarizer and method of manufacturing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090070085A (en) | 2007-12-26 | 2009-07-01 | 주식회사 에이스 디지텍 | Method for manufacturing polarizer and polarizing plate using thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001296428A (en) * | 2000-04-17 | 2001-10-26 | Nitto Denko Corp | Method for manufacturing polarizing plate and liquid crystal display device |
| JP4323269B2 (en) * | 2003-09-10 | 2009-09-02 | 住友化学株式会社 | Manufacturing method of polarizing film |
| JP4323280B2 (en) * | 2003-10-07 | 2009-09-02 | 住友化学株式会社 | Manufacturing method of polarizing film, manufacturing method of polarizing plate, and manufacturing method of optical laminate |
| JP2009015314A (en) * | 2007-06-05 | 2009-01-22 | Japan Steel Works Ltd:The | Method and apparatus for manufacturing polarizing film |
| JP2009069375A (en) * | 2007-09-12 | 2009-04-02 | Sumitomo Chemical Co Ltd | Method of manufacturing polarizing plate |
| JP5548469B2 (en) * | 2010-02-15 | 2014-07-16 | 住友化学株式会社 | Manufacturing method of polarizing film |
| CN103149620B (en) * | 2011-12-06 | 2017-04-12 | 日东电工株式会社 | Process for producing polarizing element and process for producing polarizing plate |
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2014
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2015
- 2015-08-20 WO PCT/JP2015/073413 patent/WO2016027864A1/en active Application Filing
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- 2015-08-20 JP JP2016544252A patent/JPWO2016027864A1/en active Pending
- 2015-08-20 CN CN201580044385.4A patent/CN106662696A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090070085A (en) | 2007-12-26 | 2009-07-01 | 주식회사 에이스 디지텍 | Method for manufacturing polarizer and polarizing plate using thereof |
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| Publication number | Publication date |
|---|---|
| WO2016027864A1 (en) | 2016-02-25 |
| KR20170045265A (en) | 2017-04-26 |
| TW201613992A (en) | 2016-04-16 |
| CN106662696A (en) | 2017-05-10 |
| JPWO2016027864A1 (en) | 2017-06-01 |
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