WO2015046936A1 - Film optique et son procédé de fabrication - Google Patents

Film optique et son procédé de fabrication Download PDF

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Publication number
WO2015046936A1
WO2015046936A1 PCT/KR2014/008997 KR2014008997W WO2015046936A1 WO 2015046936 A1 WO2015046936 A1 WO 2015046936A1 KR 2014008997 W KR2014008997 W KR 2014008997W WO 2015046936 A1 WO2015046936 A1 WO 2015046936A1
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WO
WIPO (PCT)
Prior art keywords
film
adhesive layer
polarizer
polyvinyl alcohol
optical film
Prior art date
Application number
PCT/KR2014/008997
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English (en)
Korean (ko)
Inventor
김종훈
박기호
이정규
Original Assignee
삼성에스디아이 주식회사
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Filing date
Publication date
Priority claimed from KR1020140128552A external-priority patent/KR101835924B1/ko
Application filed by 삼성에스디아이 주식회사 filed Critical 삼성에스디아이 주식회사
Publication of WO2015046936A1 publication Critical patent/WO2015046936A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements

Definitions

  • the present invention relates to an optical film and a method of manufacturing the same.
  • Polarizing plates are used inside and outside the liquid crystal cell for the purpose of controlling the vibration direction of light in order to visualize the display pattern of the liquid crystal display device.
  • Applications of liquid crystal display devices range from small devices in the early stages of development to notebook computers, liquid crystal monitors, liquid crystal color projectors, liquid crystal televisions, in-vehicle navigation systems, personal phones, and measuring devices used indoors and outdoors. It is shown. In particular, among the field of application of the liquid crystal display device, a liquid crystal monitor, a liquid crystal television, etc. often use a high brightness backlight.
  • the polarizing film used for a polarizing plate also came to require thickness reduction more than a conventional product.
  • the technical problem to be solved by the present invention is to provide an optical film including a polarizer having excellent optical characteristics as described above.
  • the optical film according to an embodiment of the present invention for achieving the above object is a polarizer, a first adhesive layer and a second adhesive layer formed on both sides of the polarizer, respectively, and a first adhesive layer formed in contact with the first adhesive layer and the second adhesive layer It includes a protective film and a second protective film, at least one of the first adhesive layer and the second adhesive layer may have an orientation.
  • the polarizer may have a thickness in the range of 0.5 ⁇ m to 15 ⁇ m.
  • the polarizer may include a polyvinyl alcohol-based resin containing a dichroic material.
  • the polarizer may be a uniaxially stretched film or a biaxially stretched film.
  • An orientation of at least one of the first adhesive layer and the second adhesive layer having at least a portion of the alignment may be the same as that of the polarizer.
  • the surface roughness of the polarizer may be Rz of 3 ⁇ m or less.
  • At least one of the first adhesive layer and the second adhesive layer may have at least one absolute value of a ratio of the maximum absorbance to the minimum absorbance greater than 1.
  • the optical film according to another embodiment of the present invention for achieving the above object includes a polarizer, a third adhesive layer and a fourth adhesive layer formed on both sides of the polarizer, and a third protective film formed in contact with the third adhesive layer. At least a portion of the fourth adhesive layer may have an orientation.
  • the optical film according to another embodiment of the present invention for achieving the above object comprises a polarizer, a fifth adhesive layer formed on one surface of the polarizer, and a fourth protective film formed in contact with the fifth adhesive layer, the fifth At least a portion of the adhesive layer may have an orientation.
  • the optical film manufacturing method for achieving the above object is a step of laminating a polyvinyl alcohol-based film on the at least one surface of the base film via an adhesive, dyeing the laminated film with a dichroic dye May include stretching the laminated film, removing the base film to obtain a polarizer, and laminating a protective film to the polarizer.
  • the stretching ratio of the stretching step may range from 2.0: 1 to 10: 1.
  • the step of laminating the polyvinyl alcohol-based film on the base film may be laminating the polyvinyl alcohol-based film on both sides of the base film.
  • the first protective film is laminated on the opposite side of the base film of the polyvinyl alcohol-based film of the laminated film, and after removing the base film, the second protective film is a substrate of the polyvinyl alcohol-based film It can laminate on a film bonding surface.
  • the adhesive inside the laminated film may have an orientation.
  • the optical film of the present invention includes a polarizing film having excellent optical properties while being a thin film, and the optical film manufacturing method of the present invention can produce an optical film including a polarizer having easy and excellent optical properties in the process.
  • FIG. 1 is a cross-sectional view schematically showing an optical film according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing an optical film according to another embodiment of the present invention.
  • FIG. 3 is a cross-sectional view schematically showing an optical film according to another embodiment of the present invention.
  • FIG. 4 is a schematic process flowchart of an optical film manufacturing method according to an embodiment of the present invention.
  • references to elements or layers "on" other elements or layers include all instances where another layer or other element is directly over or in the middle of another element. Like reference numerals refer to like elements throughout.
  • first, second, etc. are used to describe various components, these components are of course not limited by these terms. These terms are only used to distinguish one component from another. Therefore, of course, the first component mentioned below may be a second component within the technical spirit of the present invention.
  • FIGS. 1 to 3. are cross-sectional views schematically showing an optical film according to embodiments of the present invention.
  • an optical film may include a polarizer 110, a first adhesive layer 131 and a second adhesive layer 132 formed on both surfaces of the polarizer 110, and a first adhesive layer 132.
  • a first protective film 121 and a second protective film 122 formed in contact with the first adhesive layer 131 and the second adhesive layer 132 and positioned on both surfaces in the thickness direction, and including the first adhesive layer 131 and At least one of the second adhesive layers 132 may be at least partially aligned.
  • the thickness of the polarizer 110 may be appropriately adjusted depending on the conditions of the device to be applied, but is not limited thereto, and may be in the range of 0.5 ⁇ m to 15 ⁇ m. When the thickness of the polarizer 110 is 0.5 ⁇ m or more, the process may be thinner, and when it is 15 ⁇ m or less, it may be applied to a thin film device or the like.
  • the polarizer 110 may be used without limitation as long as it is a material having a polarizing function.
  • the polarizer 110 may include a polyvinyl alcohol (PVA) -based resin containing a dichroic material.
  • PVA polyvinyl alcohol
  • it may further contain a suitable additive.
  • the additives include a surfactant and an antioxidant, but are not limited thereto.
  • the polarizer 110 may be a uniaxially or biaxially stretched film.
  • the stretched polarizer may realize retardation characteristics when adhered to the liquid crystal cell.
  • dichroic materials include, but are not limited to, iodine, dyes, pigments and mixtures thereof.
  • the polyvinyl alcohol-based resin can generally be obtained by saponifying a polyvinyl acetate-based resin.
  • the polyvinyl alcohol-based resin generally may have a saponification degree in a range of 85 mol% to 100 mol%, and a polymerization degree in a range of 1,000 to 10,000, but is not limited thereto.
  • Non-limiting examples of the polyvinyl alcohol-based resins include polyvinyl alcohol or ethylene-vinyl alcohol copolymers.
  • the optical film 100 may be used as a polarizing plate by itself, but may be used after removing at least one of the first protective film 121 and the second protective film 122.
  • the first protective film 121 and the second protective film 122 are used in the polarizing plate, it may be a transparent material to suit the purpose.
  • the first protective film 121 and the second protective film 122 are not particularly limited as long as they are suitable materials for each application, but are not limited to triacetyl cellulose, cellulose such as diacetyl cellulose, polyethylene terephthalate, polyethylene naphthalate, and polybutylene. Polyesters such as terephthalate, cyclic polyolefins, polycarbonates, polyethers, polysulfones, polyamides, polyimides, polyolefins, polyarylates, polyvinyl alcohols, polyvinyl chlorides
  • the film may be made of a material selected from the group consisting of polyvinylidene chloride, acrylic, or a mixture thereof, but is not limited thereto.
  • the first protective film 121 and the second protective film 122 may each have a thickness in the range of 5 ⁇ m to 200 ⁇ m. In the above range, it can be used as a polarizing plate when laminated on the polarizing element. In some exemplary embodiments, the first protective film 121 and the second protective film 122 may have a thickness in the range of 5 ⁇ m to 100 ⁇ m, respectively, for the purpose of thinning.
  • the alignment of at least one of the first adhesive layer 131 and the second adhesive layer 132 having at least a portion of the alignment may be the same as the alignment direction of the polarizer 110. For this reason, more excellent optical characteristics can be exhibited.
  • the orientation can be confirmed by the ratio of the maximum absorbance to the minimum absorbance.
  • the minimum absorbance can be obtained when the polarization perpendicular to the alignment direction is incident, and the maximum absorbance can be obtained when the polarization parallel to the orientation direction is incident. If not oriented at all, the ratio of the maximum absorbance to the minimum absorbance will be one.
  • the ratio of the maximum absorbance to the minimum absorbance may be infinite, so the upper limit of the ratio of the maximum absorbance to the minimum absorbance is meaningless.
  • the ratio since the positive direction and the negative direction may be defined according to the direction, the ratio may be determined as an absolute value.
  • the absolute value of the ratio of the maximum absorbance to the minimum absorbance is greater than one.
  • the polarizer 110 may have a surface roughness of Rz of 3 ⁇ m or less, but is not limited thereto. When having a relatively low surface roughness as described above, it is possible to reduce the haze problem and the like, and to exhibit high optical properties in some cases.
  • the optical film according to another embodiment of the present invention may include a polarizer 210, a third adhesive layer 231 and a fourth adhesive layer 232, and a third adhesive layer formed on both surfaces of the polarizer 210, respectively.
  • a third protective film 220 formed in contact with 231, and at least a portion of the fourth adhesive layer 232 may have an orientation.
  • the fourth adhesive layer 232 may face the display substrate, or may contact a separate film for protecting the optical film itself.
  • an optical film according to another embodiment of the present invention is formed in contact with the polarizer 310, the fifth adhesive layer 330 formed on one surface of the polarizer 310, and the fifth adhesive layer 330.
  • the fourth protective film 320 at least a portion of the fifth adhesive layer 330 may have an orientation.
  • the liquid crystal display according to the exemplary embodiment of the present invention may include the optical film.
  • a description with reference to reference numerals of FIG. 1 is as follows.
  • the liquid crystal display device may include a liquid crystal cell and a backlight unit.
  • the liquid crystal cell usually includes two substrates and a liquid crystal layer interposed between the substrates.
  • one of the substrates may include a color filter, an opposite electrode, and an alignment layer
  • the other substrate may include a liquid crystal driving electrode, a wiring pattern, a thin film transistor element, and an alignment layer.
  • Examples of the operation mode of the liquid crystal cell include a twisted nematic mode or an electrically controlled birefrigence mode.
  • Examples of the electrically controlled birefrigence mode include a vertical alignment method, an OCB (Optically Compensated) method, an IPS (In-Plane Switching) method, and the like.
  • the backlight unit may generally include a light source, a light guide plate, a reflective film, and the like. According to the configuration of the backlight can be arbitrarily divided into a direct method, a side light method, a planar light source method.
  • the optical film 100 may be interposed between the backlight unit and the liquid crystal cell.
  • the polarizer 110 of the optical film 100 may transmit only light that vibrates in a specific direction among the light incident from the light source of the backlight unit.
  • the optical film 100 may be included at a position opposite to the backlight of the liquid crystal cell. In this case, it may be a form interposed between the other components of the liquid crystal display device, it may be located on the surface of the liquid crystal display device. In addition, when two optical films 100 are positioned with the liquid crystal cell interposed therebetween, the transmission axes of the polarizers 110 of each optical film 100 may be orthogonal or parallel.
  • FIG. 4 is a schematic process flowchart of an optical film manufacturing method according to an embodiment of the present invention.
  • a step of laminating a polyvinyl alcohol-based film on at least one surface of a base film with an adhesive S10, and dyeing the laminated film with a dichroic dye.
  • the base film is not particularly limited as long as it can be stretched in a temperature range suitable for stretching the polyvinyl alcohol-based film.
  • the polymer film may have a transmittance of 90% or more, but is not limited thereto.
  • a polyvinyl alcohol-based film having a thickness of 30 ⁇ m or less is laminated to the base film using an adhesive.
  • the drying process may be performed.
  • the drying temperature may be a temperature below the melting point and / or glass transition temperature of the base film and the polyvinyl alcohol-based film.
  • the dyeing step (S20) is a process of introducing iodine, a dye, a pigment, or a mixture thereof, which is a dichroic substance, into the polyvinyl alcohol-based film of the laminated film to adsorb them into the film.
  • the iodine, dye, or pigment molecules absorb light oscillating in the stretching direction of the polarizing film and transmit light oscillating in the vertical direction, thereby obtaining polarized light having a specific vibration direction.
  • the dyeing process can be achieved by impregnating the dichroic film in a dichroic material solution.
  • the temperature of the iodine solution may range from 20 ° C. to 50 ° C., and the impregnation time may range from 10 to 300 seconds.
  • an aqueous solution containing iodine (I 2 ) and iodine ions, for example, potassium iodide (KI) used as a dissolution aid may be used.
  • the concentration of iodine (I 2 ) may range from 0.01 to 0.5 weight percent based on the total weight of the aqueous solution
  • the concentration of potassium iodide (KI) may range from 0.01 to 12 weight percent based on the total weight of the aqueous solution.
  • the swelling step may be further included before performing the dyeing step (S20).
  • the swelling step may serve to soften the molecular chain of the polyvinyl alcohol-based film and relax the molecular chain, so that the dichroic material is homogeneously dyed into the polyvinyl alcohol-based film during the dyeing process so that staining does not occur.
  • the swelling ratio can be 110% to 600%.
  • the polyvinyl alcohol-based film can be stretched to have an elongation of 1.0 to 6.0 times.
  • the swelling step can be performed by a dry method or a wet method. In an exemplary embodiment, it may be carried out by a wet method in a swelling bath containing swelling liquid.
  • the swelling temperature may vary depending on the film thickness, for example, may be in the range of 0 °C to 100 °C. Of course, in the case of the dry method can proceed at a higher temperature than the wet method.
  • a crosslinking process may be further included after the dyeing step (S20).
  • the dichroic substance molecules are dyed to the polyvinyl alcohol-based film in the dyeing step (S20), the dichroic molecules are adsorbed onto the polymer matrix of the polyvinyl alcohol-based film using boric acid, borate, or the like.
  • the crosslinking method include a deposition method in which a polyvinyl alcohol-based film is deposited by dipping a boric acid solution or the like, but is not limited thereto, and may be performed by a coating method or a spraying method for applying or spraying a solution to a film. It may be.
  • Stretching step (S30) may use a wet stretching method and / or dry stretching method common in the art.
  • Non-limiting examples of the dry stretching method include an inter-roll stretching method, a heating roll stretching method, a compression stretching method, a tenter stretching method, and the like.
  • Non-limiting examples include a tenter stretching method, an inter-roll stretching method, and the like.
  • stretching may be performed in alcohols, water or boric acid aqueous solution, and for example, a solvent such as methyl alcohol or propyl alcohol may be used, but is not limited thereto.
  • Stretching temperature and time can be suitably selected and used according to the material of a film, desired elongation rate, a usage method, etc.
  • the stretching step S30 may be uniaxial stretching or biaxial stretching.
  • biaxial stretching may be performed to manufacture a polarizing film adhered to a liquid crystal cell so as to realize retardation characteristics.
  • the stretching ratio of the stretching step S30 may range from 2.0: 1 to 10: 1.
  • the adhesive layer between the base film and the polyvinyl alcohol-based film of the laminated film is stretched together, it may have the same orientation as the polyvinyl alcohol-based film.
  • the dyeing step (S20) and the stretching step (S30) does not always have to be the same order, and can be appropriately selected by the order according to the process equipment and equipment, in some cases, the stretching step (S30) is a dyeing process (S20) or may be performed simultaneously with the crosslinking process.
  • the stretching step S30 proceeds simultaneously with the dyeing step S20, the stretching step S30 may be performed in the iodine solution.
  • the stretching step (S30) may be carried out in an aqueous boric acid solution.
  • the step of laminating (S10) may be laminating a polyvinyl alcohol-based film on both sides of the base film.
  • end curling and curling may be caused by shrinkage of the polyvinyl alcohol-based film due to the difference in coefficient of thermal expansion between the base film and the polyvinyl alcohol-based film. curl) may occur.
  • shrinkage forces act in opposite directions to cancel the force to control end curling and curling.
  • two optical films can be produced per one process, the process efficiency is excellent.
  • Removing the base film to obtain a polarizer (S40) and the step of laminating the protective film (S50) can be proceeded by appropriately placing the order in some cases, in some cases may proceed at the same time, the first protective film
  • the base film may be removed between the paper of the 121 and the second protective film 122.
  • the first protective film 121 is laminated on the opposite side of the base film of the polyvinyl alcohol-based film (polarizer 110) of the laminated film, and the base film After removal, the second protective film 122 may be laminated on the base film bonding surface of the polyvinyl alcohol-based film.
  • the polyvinyl alcohol (PVA) film having a thickness of 30 ⁇ m is corona treated on one surface of the polypropylene (PP) film, a PVA adhesive is applied and laminated, and then dried at 70 ° C. for 4 minutes to obtain a laminated film.
  • the laminated film is stretched 2.5 times at room temperature for 95 seconds to undergo a swelling process.
  • the dyed laminated film is crosslinked by immersing at room temperature for 63 seconds in an aqueous solution containing 3% by weight of boric acid.
  • the laminated film is stretched so that the final stretching ratio is 5.6 times at 60 ° C. for about 105 seconds in an aqueous solution containing 3 wt% boric acid and 3 wt% KI.
  • the stretched laminated film is dried at 70 ° C. for 4 minutes to obtain a laminated film including a polarizer.
  • the base film was removed from the laminated film, and a transparent protective film (Fujita, FUJITAC 80 ⁇ m) was coated on both sides of the polarizer by applying a PVA adhesive, and then laminated at 70 ° C. for 4 minutes to prepare an optical film.
  • An optical film was manufactured in the same manner as in Preparation Example 1, except that the PVA film was laminated on both surfaces of the base film.
  • An optical film was prepared in the same manner as in Preparation Example 1, except that a 60 ⁇ m thick PVA film alone was used without a separate base film.
  • An optical film was manufactured in the same manner as in Preparation Example 1, except that the PVA solution was coated on one surface of the base film.
  • the optical films produced in Preparation Examples 1 and 2 exhibited transmittance and polarization degree equivalent to or higher than those of the conventional optical films prepared in Comparative Preparation Examples 1 and 2 in optical properties.
  • the optical films prepared in Preparation Examples 1 and 2 including polarizers having a surface roughness Rz of less than 3.0 ⁇ m have a polarization degree higher than that of the optical film manufactured in Comparative Preparation Example 1 including a polarizer having a surface roughness Rz of 3.0 ⁇ m or more. It can be confirmed that is excellent.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne un film optique comprenant : un polariseur ; une première couche adhésive et une seconde couche adhésive formées respectivement sur les deux surfaces du polariseur ; et un premier film protecteur et un second film protecteur formés en étant fixés à la première couche adhésive et à la seconde couche adhésive, au moins une partie de la première couche adhésive et/ou de la seconde couche adhésive présentant des propriétés d'alignement. L'invention concerne également un procédé de fabrication d'un film optique permettant à un adhésif se trouvant à l'intérieur d'un film stratifié d'avoir des propriétés d'alignement, par la stratification d'un film à base d'un poly(alcool vinylique) sur au moins une surface du film optique tandis qu'un adhésif est interposé, et sa stratification.
PCT/KR2014/008997 2013-09-27 2014-09-26 Film optique et son procédé de fabrication WO2015046936A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20130114914 2013-09-27
KR10-2013-0114914 2013-09-27
KR1020140128552A KR101835924B1 (ko) 2013-09-27 2014-09-25 광학 필름 및 그 제조방법
KR10-2014-0128552 2014-09-25

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WO2015046936A1 true WO2015046936A1 (fr) 2015-04-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016175585A1 (fr) * 2015-04-29 2016-11-03 주식회사 트리아펙스 Film de polarisation, son procédé de fabrication et lentille de polarisation le comprenant
CN113927976A (zh) * 2021-11-09 2022-01-14 佛山纬达光电材料股份有限公司 一种可用于拍摄天空蓝的消光片结构及其方法

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Publication number Priority date Publication date Assignee Title
JP2000338329A (ja) * 1999-06-01 2000-12-08 Sanritsutsu:Kk 偏光板及びその製造方法
KR20060008316A (ko) * 2003-05-02 2006-01-26 닛토덴코 가부시키가이샤 광학 필름, 그 제조방법 및 그것을 사용한 화상표시장치
KR20070100218A (ko) * 2005-01-19 2007-10-10 가부시끼가이샤 퓨처 비전 액정 표시 장치
KR20090070085A (ko) * 2007-12-26 2009-07-01 주식회사 에이스 디지텍 편광자의 제조방법 및 그로부터 제조된 편광판
JP2012068677A (ja) * 2010-03-31 2012-04-05 Sumitomo Chemical Co Ltd 偏光性積層フィルム、偏光板、およびそれらの製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000338329A (ja) * 1999-06-01 2000-12-08 Sanritsutsu:Kk 偏光板及びその製造方法
KR20060008316A (ko) * 2003-05-02 2006-01-26 닛토덴코 가부시키가이샤 광학 필름, 그 제조방법 및 그것을 사용한 화상표시장치
KR20070100218A (ko) * 2005-01-19 2007-10-10 가부시끼가이샤 퓨처 비전 액정 표시 장치
KR20090070085A (ko) * 2007-12-26 2009-07-01 주식회사 에이스 디지텍 편광자의 제조방법 및 그로부터 제조된 편광판
JP2012068677A (ja) * 2010-03-31 2012-04-05 Sumitomo Chemical Co Ltd 偏光性積層フィルム、偏光板、およびそれらの製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016175585A1 (fr) * 2015-04-29 2016-11-03 주식회사 트리아펙스 Film de polarisation, son procédé de fabrication et lentille de polarisation le comprenant
US10408982B2 (en) 2015-04-29 2019-09-10 Triaplex Co., Ltd. Polarizing film, preparation method thereof, polarizing lens comprising the same
CN113927976A (zh) * 2021-11-09 2022-01-14 佛山纬达光电材料股份有限公司 一种可用于拍摄天空蓝的消光片结构及其方法

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