WO2016027864A1 - Procédé de fabrication de polariseur - Google Patents

Procédé de fabrication de polariseur Download PDF

Info

Publication number
WO2016027864A1
WO2016027864A1 PCT/JP2015/073413 JP2015073413W WO2016027864A1 WO 2016027864 A1 WO2016027864 A1 WO 2016027864A1 JP 2015073413 W JP2015073413 W JP 2015073413W WO 2016027864 A1 WO2016027864 A1 WO 2016027864A1
Authority
WO
WIPO (PCT)
Prior art keywords
polarizer
film
complementary color
crosslinking
boric acid
Prior art date
Application number
PCT/JP2015/073413
Other languages
English (en)
Japanese (ja)
Inventor
勇介 松岡
英樹 松久
公彦 矢可部
佑介 北河
天煕 趙
容鉉 權
崔　允碩
正寧 崔
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to JP2016544252A priority Critical patent/JPWO2016027864A1/ja
Priority to KR1020177007333A priority patent/KR20170045265A/ko
Priority to CN201580044385.4A priority patent/CN106662696A/zh
Publication of WO2016027864A1 publication Critical patent/WO2016027864A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to a method for manufacturing a polarizer.
  • Polarized light used in various image display devices such as liquid crystal display (LCD), electroluminescence (EL) display, plasma display (PDP), field emission display (FED), organic light emitting diode (OLED), etc.
  • the plate generally includes a polarizer in which an iodine compound or a dichroic polarizing material is adsorbed and oriented on a polyvinyl alcohol (PVA) film, and a polarizer protective film is sequentially formed on one surface of the polarizer.
  • PVA polyvinyl alcohol
  • the other surface of the polarizer has a multilayer structure in which a polarizer protective film, an adhesive layer bonded to a liquid crystal cell, and a release film are sequentially stacked.
  • the polarizer constituting the polarizing plate is required to have a high transmittance and polarization degree in order to be applied to an image display device and provide an image excellent in hue reproducibility. Further, as the application of flat panel display devices to various fields spreads and the tendency to increase in size becomes more prominent, various image display devices such as liquid crystal display devices may be used for a long time at high temperatures. As a result, the demand for improvement in durability along with improvement in polarization performance and optical performance has increased, and as a result, the conditions for the performance of the polarizing plate have become very strict. In addition, image display devices having characteristics suitable for various environments and applications are currently being sought. Optical durability including hue change under high temperature and high humidity conditions, high contrast through high orientation and high transmission It has been demanded.
  • Korean Patent Publication No. 2009-70085 discloses a method of manufacturing a polarizer, but could not present an alternative to the above problem.
  • An object of the present invention is to provide a method capable of producing a polarizer having improved hue durability.
  • a step of swelling, dyeing, crosslinking, complementary color and first stretching of the film for forming a polarizer wherein the swelling step, the dyeing step, the crosslinking step and the complementary color step are performed in this order, and the first stretching step Is performed before the complementary color step
  • a method for producing a polarizer wherein the film for forming a polarizer is second stretched at a stretch ratio of 1.010 to 1.100 times in the complementary color step.
  • the first stretching is performed in one or more steps selected from the group consisting of swelling, dyeing and crosslinking steps.
  • the concentration of the boric acid compound in the complementary color liquid in the complementary color step is lower than the concentration of the boric acid compound in the crosslinking liquid.
  • the method for producing a polarizer wherein the concentration of iodide in the complementary color solution of the complementary color step is lower than the concentration of iodide in the crosslinking solution.
  • the method of the present invention can produce a polarizer with significantly improved hue durability. Thereby, even when exposed to a high temperature condition for a long time, the hue change can be minimized.
  • the method of the present invention can produce a polarizer having an excellent degree of polarization.
  • the present invention includes the steps of swelling, dyeing, cross-linking, complementary color and first stretching the polarizer-forming film, and in the complementary color step, the polarizer-forming film is secondly stretched at a stretch ratio of 1.01 to 1.1 times.
  • the present invention relates to a method for producing a polarizer that can produce a polarizer in which a change in hue is minimized even when exposed to high temperature conditions for a long time by stretching.
  • the method for producing a polarizer of the present invention includes the steps of swelling, dyeing, crosslinking, complementary color and first stretching the polarizer-forming film.
  • the swelling step, dyeing step, cross-linking step, and complementary color step are performed in this order, and the first stretching step is performed before the complementary color step.
  • stretching of the film for polarizer formation is performed by a complementary color step among the manufacturing processes of the said polarizer.
  • a complex is formed between the polymer constituting the polarizer forming film and the dichroic substance in the step of dyeing the polarizer forming film in the manufacturing process of the polarizer, and this is fixed in the crosslinking step.
  • the film for forming a polarizer is washed with water only up to the crosslinking step, the degree of orientation of the complex of the dichroic substance is low, so that the stability is inferior, the hue of the polarizer changes, or the durability is lowered There's a problem.
  • the complementary color step is performed after the crosslinking step, and the film for forming the polarizer is stretched in the complementary color step (second stretching), thereby increasing the degree of orientation of the complex of the dichroic substance.
  • the hue change of a polarizer can be suppressed and durability can be improved remarkably.
  • the second stretching is performed at a stretching ratio of 1.010 to 1.100. If the draw ratio is less than 1.010 times, the effect of improving the degree of orientation of the complex of the dichroic substance is negligible. If the draw ratio exceeds 1.100 times, the film may be broken by excessive stretching. Preferably, it can be performed at a draw ratio of 1.020 to 1.080.
  • the number of repetitions of each production step of the polarizer of the present invention, process conditions, etc. are not particularly limited as long as they do not depart from the purpose of the present invention. It may be performed simultaneously with one or more steps.
  • the type of the polarizer-forming film is not particularly limited as long as it is a film that can be dyed with a dichroic substance, that is, iodine or the like.
  • a polyvinyl alcohol film a partially saponified polyvinyl alcohol film; a polyethylene terephthalate film, Hydrophilic polymer films such as ethylene-vinyl acetate copolymer films, ethylene-vinyl alcohol copolymer films, cellulose films, partially saponified films thereof; or dehydrated polyvinyl alcohol films
  • Examples include a polyene oriented film such as a polyvinyl alcohol film subjected to dehydrochlorination treatment.
  • a polyvinyl alcohol film is preferable because it not only has an excellent effect of enhancing the uniformity of the degree of polarization in the plane but also has an excellent dyeing affinity for iodine.
  • the swelling step is performed by immersing the unstretched polarizer-forming film in a swelling tank filled with a swelling aqueous solution before dyeing it, such as dust deposited on the surface of the polarizer-forming film or an anti-blocking agent. This is a step for removing impurities, swelling the polarizer-forming film, improving the drawing efficiency, and preventing the uneven dyeing and improving the physical properties of the polarizer.
  • aqueous solution for swelling water (pure water, deionized water) may be usually used alone, and a small amount of glycerin may be added to improve the processability of the polymer film.
  • the content is not particularly limited, and may be, for example, 5% by weight or less of the total weight of the aqueous solution for swelling.
  • the temperature of the swelling tank is not particularly limited, and may be, for example, 20 to 45 ° C., preferably 20 to 40 ° C.
  • the temperature of a swelling tank is in said range, it is excellent in subsequent extending
  • the execution time of the swelling step is not particularly limited, and may be, for example, 180 seconds or less, and preferably 90 seconds or less.
  • swelling bath immersion time is within the above range, it can suppress saturation due to excessive swelling, prevent breakage due to softening of the polarizer forming film, and uniform adsorption of iodine in the dyeing step The degree of polarization can be improved.
  • the swelling step and the first stretching step may be performed at the same time.
  • the stretching ratio may be about 1.1 to 3.5 times, preferably 1.5 to 3.0 times. . If the stretching ratio is less than 1.1 times, wrinkles may occur, and if it exceeds 3.5 times, the initial optical properties may be deteriorated.
  • an expander roll, a spiral roll, a crown roll, a cross guider, a bend bar or the like may be provided in the bath and / or at the entrance / exit of the bath.
  • the dyeing step is a step of immersing the polarizer forming film in a dyeing tank filled with a dichroic substance, for example, a dyeing solution containing iodine, and adsorbing iodine to the polarizer forming film.
  • a dichroic substance for example, a dyeing solution containing iodine, and adsorbing iodine to the polarizer forming film.
  • the staining liquid may further contain water, a water-soluble organic solvent, or a mixed solvent thereof and iodine.
  • concentration of iodine may be 0.4 to 400 mmol / L in the staining solution, preferably 0.8 to 275 mmol / L, more preferably 1 to 200 mmol / L.
  • the dyeing solution may further contain iodide as a solubilizing agent for improving the dyeing efficiency.
  • the type of iodide is not particularly limited.
  • titanium iodide, and potassium iodide is preferred in that it has high solubility in water. You may use these individually or in mixture of 2 or more types.
  • the iodide content is not particularly limited, and may be, for example, 0.01 to 10% by weight, preferably 0.1 to 5% by weight, based on the total weight of the dyeing solution.
  • the staining solution used in the staining step of the present invention may further contain a boric acid compound.
  • a boric acid compound By including the boric acid compound in the dyeing solution, the residence time of the boric acid compound can be improved before the crosslinking reaction, thereby increasing the complex formation rate of the dichroic substance in the polarizer-forming film. Thereby, the hue durability of a polarizer can be improved and the degree of polarization is improved.
  • the boric acid compound in the dyeing solution is included so as to have a higher concentration than the boric acid compound added to the crosslinking solution in the subsequent crosslinking step.
  • the concentration of the boric acid compound in the staining solution is not particularly limited, but may be, for example, 0.3 to 5% by weight of the total weight of the staining solution, and preferably 0.5 to 3% by weight. good.
  • concentration of the boric acid compound in the staining solution is less than 0.3% by weight, the effect of increasing the formation of iodine complex decreases, and when it exceeds 5% by weight, cutting may occur due to an increase in stress.
  • the kind of the boric acid compound is not particularly limited, and examples of the boric acid compound include boric acid, sodium borate, potassium borate, and lithium borate. You may use these individually or in mixture of 2 or more types.
  • the temperature of the dyeing tank is not particularly limited, and may be, for example, 5 to 42 ° C., preferably 10 to 35 ° C.
  • the time for immersing the polarizer forming film in the dyeing tank 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 simultaneously with the dyeing step.
  • the stretching ratio may be 1.01 to 2.0 times, and preferably 1.1 to 1.8 times. .
  • the cumulative stretching ratio of the polarizer up to the swelling and first stretching step is preferably 1.2 to 4.0 times. If the cumulative stretch ratio is less than 1.2 times, the film may wrinkle, and if it exceeds 4.0 times, the initial optical properties may be deteriorated.
  • the cross-linking step is a step of fixing the adsorbed iodine molecules by immersing the polarizer forming film dyed so that the dyeability by the physically adsorbed iodine molecules does not deteriorate due to the external environment. .
  • the crosslinking liquid used for the crosslinking step of the present invention contains a boric acid compound.
  • the cross-linking efficiency can be improved, the generation of wrinkles in the film during the process can be suppressed, the orientation of the dichroic material can be formed, and the optical characteristics can be improved.
  • iodine which is a dichroic dye
  • iodine molecules may be detached by a moist heat environment, so that sufficient crosslinking reaction is required.
  • the cross-linking step according to the present invention may be performed in the first cross-linking step and the second cross-linking step, and a boric acid compound may be included in the cross-linking liquid used in one or more of the cross-linking steps. .
  • the concentration of the boric acid compound in the crosslinking liquid is not particularly limited, but may be, for example, 1 to 10% by weight, preferably 2 to 6% by weight, based on the total weight of the crosslinking liquid.
  • concentration of the boric acid compound in the crosslinking liquid is less than 1% by weight, the crosslinking effect may be reduced and the orientation of the film may be lowered. obtain.
  • the same boric acid compound as that used in the dyeing step can be used.
  • the cross-linking liquid of the present invention may contain water used as a solvent and an organic solvent that is mutually soluble with water, and prevents the uniformity of the degree of polarization in the plane of the polarizer and the desorption of dyed iodine. Therefore, a small amount of iodide may be further contained.
  • the iodide used may be the same as that used in the dyeing step, and the concentration of the iodide is not particularly limited, and is, for example, 0.05 to 15% by weight of the total weight of the crosslinking solution. Preferably 0.5 to 11% by weight.
  • the temperature of the crosslinking tank is not particularly limited, but may be, for example, 20 to 70 ° C., and preferably 40 to 60 ° C.
  • the time for immersing the polarizer-forming film in the crosslinking tank is not particularly limited, and may be, for example, 1 second to 15 minutes, and preferably 5 seconds to 10 minutes.
  • the first stretching step may be performed simultaneously with the crosslinking step.
  • the stretching ratio of the first crosslinking step may be 1.4 to 3.0 times, preferably 1.5 to 2.5 times. It is good to be.
  • the stretching ratio of the second crosslinking step may be 1.01 to 2.0 times, and 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.
  • the cumulative stretch ratio is less than 1.5 times, the effect of increasing the crosslinking efficiency is insignificant.
  • it exceeds 5.0 times the film is broken by excessive stretching, and the production efficiency is increased. Can be reduced.
  • the first stretching step may be performed simultaneously with at least one of the swelling step, the dyeing step, and the crosslinking step, or may be performed in air or an inert gas while transferring the film after the above step. Alternatively, it may be performed in an independent stretching step using a separate stretching tank filled with a stretching solution. Alternatively, an unstretched 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.
  • Stretching may be performed in one step or may be performed in two or more steps, but is preferably performed in two or more steps.
  • the stretching may be performed by a method of providing a peripheral speed difference of the nip roll.
  • an expander roll, a spiral roll, a crown roll, a cross guider, a bend bar or the like may be provided in the bath and / or at the entrance / exit of the bath.
  • the complementary color step is a step of adjusting the hue by immersing the film having undergone the crosslinking step in a complementary color solution containing a boric acid compound, preferably a complementary color solution containing a boric acid compound and iodide.
  • the present invention can improve the stability by increasing the degree of orientation of the complex of the dichroic substance by performing the second stretching of the film for forming the polarizer in the complementary color step, and thus can be produced by the method of the present invention.
  • the polarizer is excellent in hue durability because the decomposition of the complex is minimized even after being exposed to a high temperature for a long time.
  • the second stretching is performed at a stretching ratio of 1.010 to 1.100. If the draw ratio is less than 1.010 times, the effect of improving the degree of orientation of the complex of the dichroic substance is negligible. If the draw ratio exceeds 1.100 times, the film may be broken by excessive stretching.
  • the second stretching may be performed at a stretching ratio of preferably 1.020 to 1.080.
  • the total cumulative stretch ratio of the first and second stretches of the present invention is preferably 4.0 to 7.0 times.
  • “cumulative stretch ratio” means a value obtained by multiplying the stretch ratio of each step. .
  • the complementary color solution used in the complementary color step of the present invention contains a boric acid compound.
  • the same boric acid compound as that used in the dyeing step can be used.
  • the concentration of the boric acid compound in the complementary color solution is not particularly limited, but may be, for example, 1 to 10% by weight, preferably 2 to 6% by weight, based on the total weight of the complementary color solution.
  • concentration of the boric acid compound in the complementary color liquid is less than 1% by weight, the orientation of iodine cannot be improved, and the effect of suppressing hue change and improving durability is insignificant. If it exceeds 1, the tension is generated in the film at the time of stretching due to excessive crosslinking, so that stretching is difficult and the film may be broken.
  • the concentration of the boric acid compound in the complementary color solution of the present invention is lower than the concentration of the boric acid compound in the crosslinking solution.
  • the boric acid compound serves to fix the adsorbed iodine molecules in the cross-linking solution, if a large amount of the boric acid compound is contained, a large tension is generated when the polarizer-forming film is stretched.
  • the boric acid compound since the second stretching is performed in the complementary color step, it is preferable that the boric acid compound is contained in a small amount in order to reduce the tension.
  • the concentration ratio is not particularly limited.
  • the concentration of the boric acid compound in the crosslinking liquid and the concentration of the boric acid compound in the complementary color liquid may have a ratio of 1: 0.4 to 0.8.
  • the concentration ratio is less than 1: 0.4, the orientation of iodine cannot be improved, and the effect of suppressing hue change and improving durability is insignificant. If it is included in an excessive amount and exceeds 1: 0.8, a large tension is generated in the film at the time of stretching, so that stretching is difficult and the film may be broken.
  • the complementary color solution of the present invention may contain water used as a solvent and an organic solvent that can be mutually dissolved together with water, in order to prevent the uniformity of the degree of polarization in the polarizer plane and the desorption of dyed iodine.
  • a small amount of iodide may be further contained.
  • the iodide used may be the same as that used in the dyeing step and the crosslinking step, and the concentration of the iodide is not particularly limited. For example, 0.05 to 15% by weight of the total weight of the complementary color solution It may be 0.5 to 11% by weight.
  • concentration of iodide in the complementary color solution satisfies the above range, iodine ions that have not been adsorbed in the dyeing and crosslinking steps can be adsorbed to the film, and iodine ions contained in the complementary color solution can be absorbed into the film.
  • the color and transmittance can be adjusted by increasing the penetration into the skin.
  • the iodide concentration in the complementary color solution of the present invention is lower than the iodide concentration in the crosslinking solution.
  • iodide serves to prevent the iodine ions adsorbed in the dyeing step from desorbing from the film, but the complementary color solution also contains a large amount of iodide at a level similar to that of the cross-linking solution.
  • the iodine complex When exposed to high temperature heat for a long period of time, the iodine complex can be decomposed and the durability of the polarizer can be reduced.
  • the concentration ratio is not particularly limited.
  • the concentration of iodide in the cross-linking solution and the concentration of iodide in the complementary color solution may have a ratio of 1: 0.2 to 0.6. If a small amount of iodide is contained in the complementary color solution and the concentration ratio is less than 1: 0.2, the hue cannot be adjusted. When exposed, the iodine complex can be decomposed to reduce durability.
  • the temperature of the complementary color tank is 20 to 70 ° C., and the immersion time of the polyvinyl alcohol film in the complementary color tank may be 1 second to 15 minutes, preferably 5 seconds to 10 minutes.
  • the method for producing a polarizer of the present invention may further include a water washing step after the complementary color is completed.
  • the water washing step is a step of immersing the film for forming a polarizer after completion of complementary color in a water washing tank filled with a water washing solution to remove unnecessary residues attached to the film for forming a polarizer in the previous step.
  • the aqueous washing solution may be water (deionized water), and an iodide may be further added thereto.
  • an iodide the same ones used in the dyeing step can be used, and among these, 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 washing solution.
  • the temperature of the washing tank is not particularly limited, and may be, for example, 10 to 60 ° C, and preferably 15 to 40 ° C.
  • the washing step can be omitted and may be performed each time a previous step such as a dyeing step, a crosslinking step, a first stretching step or a complementary color step is completed. Further, it may be repeated one or more times, and the number of repetitions is not particularly limited.
  • the drying step is a step of drying the washed polarizer-forming film and further improving the orientation of iodine molecules dyed by neck-in by drying to obtain a polarizer having excellent optical properties.
  • drying methods methods such as natural drying, air drying, heat drying, microwave drying, hot air drying and the like can be used. Recently, a new microwave treatment that activates and dries only the water in the film has been newly introduced. In general, hot air treatment and far-infrared treatment are mainly used.
  • the temperature at the time of hot air drying is not particularly limited, but it is preferably performed at a relatively low temperature in order to prevent deterioration of the polarizer, and may be, for example, 20 to 90 ° C., preferably 80 ° C. or less, more preferably Is preferably 60 ° C. or lower.
  • the execution time of the hot air drying is not particularly limited, and may be performed, for example, for 1 to 10 minutes.
  • this invention provides the polarizing plate by which the protective film was laminated
  • 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 shielding property, isotropy, etc.
  • Specific examples include polyethylene terephthalate, polyethylene Polyester resins such as isophthalate and polybutylene terephthalate; Cellulosic resins such as diacetylcellulose and triacetylcellulose; Polyacrylic resins such as polycarbonate resins, polymethyl (meth) acrylate and polyethyl (meth) acrylate; Polystyrene and acrylonitrile Styrene resins such as styrene copolymers; Polyolefin resins such as polyethylene, polypropylene, cyclo- or polyolefin having a norbornene structure, and ethylene-propylene copolymers; Polyamides such as nylon and aromatic polyamides Fatty resin; imide resin; polyethersulfone resin; sulfone resin; polyetherketone resin;
  • the film which consists of thermosetting resins, such as a (meth) acrylic type, a urethane type, an epoxy type, a silicon type, or an ultraviolet curable resin.
  • thermosetting resins such as a (meth) acrylic type, a urethane type, an epoxy type, a silicon type, or an ultraviolet curable resin.
  • a cellulose-based film having a surface soaped (saponified) by alkali or the like is particularly preferable in view of polarization characteristics or durability.
  • the protective film may have a function of the following optical layer.
  • the structure of the polarizing plate is not particularly limited, and various optical layers satisfying necessary optical characteristics may be laminated on the polarizer.
  • a structure in which a protective film for protecting the polarizer is laminated on at least one surface of the polarizer; a hard coat layer, an antireflection layer, an anti-adhesion layer, a diffusion prevention layer on at least one surface of the polarizer or the protective film A structure in which a surface treatment layer such as an antiglare layer is laminated; a structure in which an alignment liquid crystal layer or other functional film for compensating a viewing angle is laminated on at least one surface of a polarizer or a protective film. There may be.
  • a wave plate (including a ⁇ plate) such as an optical film, a reflector, a semi-transmission plate, a half-wave plate, or a quarter-wave plate such as a polarization conversion device used to form various image display devices.
  • a structure in which one or more of a phase difference plate, a viewing angle compensation film, and a brightness enhancement film including an optical layer are stacked as an optical layer may be used.
  • a polarizing plate having a structure in which a protective film is laminated on one surface of a polarizer a reflective polarizing plate or a semi-transmissive polarizing plate in which a reflector or a semi-transmissive reflector is laminated on the laminated protective film;
  • An elliptical or circular polarizing plate on which a retardation plate is laminated, a wide viewing angle polarizing plate on which a viewing angle compensation layer or a viewing angle compensation film is laminated, a polarizing plate on which a brightness enhancement film is laminated, or the like is preferable.
  • Such a polarizing plate is applicable not only to a normal liquid crystal display device but also to various image display devices such as an electroluminescence display device, a plasma display device, and a field emission display device.
  • Example 1 A transparent unstretched polyvinyl alcohol film (PE60, KURARAY, Inc.) having a saponification degree of 99.9% or more was swelled by immersing it in water (deionized water) at 25 ° C. for 1 minute and 20 seconds. Dyeing was performed by immersing in an aqueous dyeing solution containing 25 mM / L, potassium iodide 1.25 wt% and boric acid 0.3 wt% at 30 ° C. for 2 minutes and 30 seconds. At this time, the film was stretched at a stretching ratio of 1.56 times and 1.64 times at the swelling and dyeing steps, respectively, and stretched so that the cumulative stretching ratio up to the dyeing tank was 2.56 times.
  • PE60 transparent unstretched polyvinyl alcohol film having a saponification degree of 99.9% or more
  • Dyeing was performed by immersing in an aqueous dyeing solution containing 25 mM / L, potassium iodide 1.25 wt
  • the film was immersed in an aqueous solution for crosslinking at 56 ° C. containing 13.9% by weight of potassium iodide and 3% by weight of boric acid for 26 seconds (first crosslinking step) while being crosslinked for a stretching ratio of 1.7 times. And stretched. Thereafter, the film was immersed in an aqueous solution for crosslinking 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 crosslinked at a stretch ratio of 1.34 times. Stretched. Subsequently, the film was stretched 1.01 times while immersed in a complementary color aqueous solution at 40 ° C. containing 5% by weight of potassium iodide and 2% by weight of boric acid for 10 seconds.
  • the total cumulative draw ratio of swelling, dyeing and crosslinking, and complementary color steps was set to 6 times.
  • the polyvinyl alcohol film was dried in an oven at 70 ° C. for 4 minutes to produce a polarizer.
  • a polarizing plate was produced by laminating a triacetyl cellulose (TAC) film on both surfaces of the produced polarizer.
  • TAC triacetyl cellulose
  • Test Example 2 The physical properties of the polarizers produced in the above Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 2 below.
  • Optical properties degree of polarization, transmittance, A700, A480
  • the manufactured polarizer was cut into a size of 4 cm ⁇ 4 cm, and the transmittance was measured using an ultraviolet-visible light spectrometer (V-7100, manufactured by JASCO).
  • V-7100 ultraviolet-visible light spectrometer
  • the degree of polarization is defined by Equation 1 below. It should be noted that a difference of about 0.001 in the degree of polarization greatly affects the contrast ratio. When the degree of polarization is less than 99.990, the contrast ratio is lowered and it is difficult to realize real black.
  • Polarization degree (P) [(T 1 ⁇ T 2 ) / (T 1 + T 2 )] 1/2 ⁇ 100
  • the unit of polarization degree (P) is%.
  • T 1 is a parallel transmittance obtained when a pair of polarizers are arranged in a state where the absorption axes are parallel
  • T 2 is a case where a pair of polarizers is arranged in a state where the absorption axes are orthogonal to each other.
  • It is the orthogonal transmittance obtained
  • A700 and A480 are defined by Equations 2 and 3.
  • TMD, 700 is a transmittance at a wavelength of 700 nm obtained when the manufactured polarizing plate is disposed in a state where the absorption axis of the polarizing plate is orthogonal to the linearly polarized light of the measurement light
  • T TD , 700 is the transmittance at a wavelength of 700 nm obtained when the manufactured polarizing plate is arranged in a state where the absorption axis of the polarizing plate is parallel to the linearly polarized light of the measuring light, and these units are in%. is there.
  • A480 ⁇ Log 10 ⁇ (TMD , 480 ⁇ TTD, 480 ) / 10000 ⁇ (In the formula, TMD, 480 is a transmittance at a wavelength of 480 nm obtained when the manufactured polarizing plate is disposed in a state where the absorption axis of the polarizing plate is orthogonal to the linearly polarized light of the measuring light, and T TD , 480 is the transmittance at a wavelength of 480 nm obtained when the manufactured polarizing plate is arranged in a state where the absorption axis of the polarizing plate is parallel to the linearly polarized light of the measuring light, and these units are all in%. is there.
  • the polarizers produced by the methods of Examples 1 to 14 exhibited excellent optical characteristics, showed high absorbance even after the heat resistance test, and did not cause a red discoloration phenomenon.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Nonlinear Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Ophthalmology & Optometry (AREA)
  • Materials Engineering (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

L'invention concerne un procédé de fabrication de polariseur. Plus précisément, l'invention concerne un procédé de fabrication de polariseur qui inclut des étapes d'expansion, de coloration, de réticulation, de compensation de couleur et de première extension d'un film pour formation de polariseur. L'étape d'expansion, l'étape de coloration, l'étape de réticulation et l'étape de compensation de couleur sont effectuées dans cet ordre. L'étape de première extension est effectuée avant l'étape de compensation de couleur. Le film pour formation de polariseur est soumis à une seconde extension selon un rapport d'extension de 1,010 à 1,100 fois lors de l'étape de compensation de couleur. Ainsi, il est possible de fabriquer un polariseur dont les variations de tonalité chromatique sont minimisées, y compris en cas de blanchiment sur une longue durée sous des conditions de hautes températures.
PCT/JP2015/073413 2014-08-22 2015-08-20 Procédé de fabrication de polariseur WO2016027864A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2016544252A JPWO2016027864A1 (ja) 2014-08-22 2015-08-20 偏光子の製造方法
KR1020177007333A KR20170045265A (ko) 2014-08-22 2015-08-20 편광자의 제조 방법
CN201580044385.4A CN106662696A (zh) 2014-08-22 2015-08-20 偏振片的制造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020140109837A KR20160023429A (ko) 2014-08-22 2014-08-22 편광자의 제조 방법
KR10-2014-0109837 2014-08-22

Publications (1)

Publication Number Publication Date
WO2016027864A1 true WO2016027864A1 (fr) 2016-02-25

Family

ID=55350805

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/073413 WO2016027864A1 (fr) 2014-08-22 2015-08-20 Procédé de fabrication de polariseur

Country Status (5)

Country Link
JP (1) JPWO2016027864A1 (fr)
KR (2) KR20160023429A (fr)
CN (1) CN106662696A (fr)
TW (1) TW201613992A (fr)
WO (1) WO2016027864A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018025764A (ja) * 2016-07-29 2018-02-15 住友化学株式会社 光学積層体
JP2018025765A (ja) * 2016-07-29 2018-02-15 住友化学株式会社 光学積層体
JP2022517625A (ja) * 2019-01-23 2022-03-09 住友化学株式会社 偏光子及びその製造方法
JP7504744B2 (ja) 2020-10-01 2024-06-24 住友化学株式会社 偏光板及び有機ｅｌ表示装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107987213B (zh) * 2017-12-28 2020-07-21 深圳市华星光电技术有限公司 偏光膜材料及其制备方法、偏光膜及其制作方法
EP3670146B1 (fr) * 2018-12-21 2023-04-12 Essilor International Procede et systeme de production d'un film a gradient de polarisation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001296428A (ja) * 2000-04-17 2001-10-26 Nitto Denko Corp 偏光板の製造方法及び液晶表示装置
JP2005084505A (ja) * 2003-09-10 2005-03-31 Sumitomo Chemical Co Ltd 偏光フィルムとその製造方法、偏光板および光学積層体
JP2005114990A (ja) * 2003-10-07 2005-04-28 Sumitomo Chemical Co Ltd 偏光フィルムの製造方法、偏光板の製造方法および光学積層体の製造方法
JP2009015314A (ja) * 2007-06-05 2009-01-22 Japan Steel Works Ltd:The 偏光フィルムの製造方法および製造装置
JP2011164553A (ja) * 2010-02-15 2011-08-25 Sumitomo Chemical Co Ltd 偏光フィルムの製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009069375A (ja) * 2007-09-12 2009-04-02 Sumitomo Chemical Co Ltd 偏光板の製造方法
KR100947939B1 (ko) 2007-12-26 2010-03-15 주식회사 에이스 디지텍 편광자의 제조방법
CN103149620B (zh) * 2011-12-06 2017-04-12 日东电工株式会社 偏振片的制造方法及偏光板的制造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001296428A (ja) * 2000-04-17 2001-10-26 Nitto Denko Corp 偏光板の製造方法及び液晶表示装置
JP2005084505A (ja) * 2003-09-10 2005-03-31 Sumitomo Chemical Co Ltd 偏光フィルムとその製造方法、偏光板および光学積層体
JP2005114990A (ja) * 2003-10-07 2005-04-28 Sumitomo Chemical Co Ltd 偏光フィルムの製造方法、偏光板の製造方法および光学積層体の製造方法
JP2009015314A (ja) * 2007-06-05 2009-01-22 Japan Steel Works Ltd:The 偏光フィルムの製造方法および製造装置
JP2011164553A (ja) * 2010-02-15 2011-08-25 Sumitomo Chemical Co Ltd 偏光フィルムの製造方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018025764A (ja) * 2016-07-29 2018-02-15 住友化学株式会社 光学積層体
JP2018025765A (ja) * 2016-07-29 2018-02-15 住友化学株式会社 光学積層体
JP2022517625A (ja) * 2019-01-23 2022-03-09 住友化学株式会社 偏光子及びその製造方法
JP7495416B2 (ja) 2019-01-23 2024-06-04 住友化学株式会社 偏光子及びその製造方法
JP7504744B2 (ja) 2020-10-01 2024-06-24 住友化学株式会社 偏光板及び有機ｅｌ表示装置

Also Published As

Publication number Publication date
TW201613992A (en) 2016-04-16
KR20160023429A (ko) 2016-03-03
CN106662696A (zh) 2017-05-10
KR20170045265A (ko) 2017-04-26
JPWO2016027864A1 (ja) 2017-06-01

Similar Documents

Publication Publication Date Title
JP6685915B2 (ja) 偏光子及び偏光子の製造方法
JP2015075762A (ja) 偏光子の製造方法
JP6694821B2 (ja) 偏光子の製造方法
WO2016027864A1 (fr) Procédé de fabrication de polariseur
JP6942055B2 (ja) 偏光子及びその製造方法
KR20120002815A (ko) 편광자의 제조방법
JP2017536562A (ja) 偏光子の製造方法、これを用いて製造された偏光子及び偏光板
KR20110135321A (ko) 편광자의 제조방법
JP6197146B1 (ja) 偏光子の製造方法
KR20130030990A (ko) 편광자의 제조방법
JP6712595B2 (ja) 偏光子の製造方法
JP6723240B2 (ja) 偏光子の製造方法
KR20120124903A (ko) 편광자의 제조방법
KR20210069893A (ko) 편광자의 제조방법
KR20160096385A (ko) 편광자의 제조방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15834390

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2016544252

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20177007333

Country of ref document: KR

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 15834390

Country of ref document: EP

Kind code of ref document: A1