WO2011162259A1 - Procédé de fabrication d'un film de polarisation - Google Patents

Procédé de fabrication d'un film de polarisation Download PDF

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Publication number
WO2011162259A1
WO2011162259A1 PCT/JP2011/064169 JP2011064169W WO2011162259A1 WO 2011162259 A1 WO2011162259 A1 WO 2011162259A1 JP 2011064169 W JP2011064169 W JP 2011064169W WO 2011162259 A1 WO2011162259 A1 WO 2011162259A1
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WIPO (PCT)
Prior art keywords
widening
film
stretching
roll
treatment
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PCT/JP2011/064169
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English (en)
Japanese (ja)
Inventor
圭二 網谷
容鉉 權
民載 丁
鐘熙 朴
廷敏 趙
昶植 康
Original Assignee
住友化学株式会社
東友ファインケム株式会社
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Application filed by 住友化学株式会社, 東友ファインケム株式会社 filed Critical 住友化学株式会社
Priority to KR1020137000813A priority Critical patent/KR101760541B1/ko
Priority to CN201180030543.2A priority patent/CN102947735B/zh
Publication of WO2011162259A1 publication Critical patent/WO2011162259A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
    • B29C55/026—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets of preformed plates or sheets coated with a solution, a dispersion or a melt of thermoplastic material
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2029/00—Use of polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals or derivatives thereof as moulding material
    • B29K2029/04—PVOH, i.e. polyvinyl alcohol
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0034—Polarising

Definitions

  • the present invention relates to a method for producing a polarizing film used for producing a polarizing plate used in a liquid crystal display device.
  • a polarizing film in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol film has been used. That is, an iodine polarizing film using iodine as a dichroic dye, a dye polarizing film using a dichroic dye as a dichroic dye, and the like are known. These polarizing films are usually used as polarizing plates by laminating a protective film such as triacetyl cellulose via an adhesive made of an aqueous solution of a polyvinyl alcohol resin on at least one side, preferably both sides thereof. (LCD) is used for, for example, a liquid crystal television, a monitor for a personal computer, a display screen of a mobile phone, and the like.
  • LCD liquid crystal television, a monitor for a personal computer, a display screen of a mobile phone, and the like.
  • a nip roll and a guide roll are used, and after the polyvinyl alcohol film is immersed in water and swollen, it is dyed with the dichroic dye, stretched, and then iodine is formed into the film.
  • a method is known in which a polyvinyl alcohol film is treated with boric acid (crosslinking treatment), washed with water and then dried. At this time, the film is stretched by giving a peripheral speed difference to the nip rolls before and after the treatment bath, the film transport direction is changed by the guide roll, and the film is introduced into and taken out of the treatment liquid.
  • the polarizing film used for the liquid crystal display device is also required to increase in optical properties and in-plane uniformity at the same time.
  • absorption axis the light absorption axis (hereinafter sometimes referred to as absorption axis) of the obtained polarizing film varies.
  • the optical properties tend to deteriorate. Further, when the in-plane optical characteristics are not uniform, display unevenness occurs when the image display device is formed.
  • Patent Document 1 in the method for producing a polarizing film in which uniaxial stretching is performed in the boric acid treatment step and / or the previous step, in order to obtain a polarizing film with fewer scratches and wrinkles and no folds, It is disclosed that a widening roll is used as at least one guide roll in the liquid.
  • a widening roll is used as at least one guide roll in the liquid.
  • the method described in Patent Document 1 for example, when stretching is performed at 1.6 times or more with an integral stretching ratio using a widening roll in a dyeing tank, variations in absorption axis occur, and the resulting polarizing film There has been a problem that the optical characteristics of the above deteriorate.
  • An object of the present invention is to provide a method for producing a polarizing film having excellent optical characteristics.
  • the present inventors conducted a uniaxial stretching of 1.6 times or more at an integrated stretching ratio while widening with a widening roll.
  • the present inventors have found a new fact that dispersion of the absorption axis of the obtained polarizing film is suppressed and a polarizing film having good optical properties can be obtained, and the present invention has been completed.
  • the manufacturing method of the polarizing film of this invention has the following structures. (1) It has a step of processing a polyvinyl alcohol film in the order of swelling treatment, dyeing treatment, boric acid treatment and washing treatment, and the peripheral speed difference between two nip rolls is determined before or during any of these steps.
  • the cumulative stretching ratio up to the stretching process (however, if there is no other stretching process up to the widening stretching process) is 1.6 times or more, and is unloaded from the widening roll in the widening stretching process.
  • the angle of the widening direction of the widening roll with respect to the film unloading direction is ⁇ 40 ° to 70 ° (however, when the film flowing direction is viewed from left to right, The direction of carrying out from the roll is 0 °, the clockwise angle from the carrying direction is-, and the counterclockwise angle is +).
  • the widening roll in the widening and stretching step is a sponge rubber roll, the hardness of the sponge is 20 to 60 degrees on the JIS Shore C scale, the density is 0.4 to 0.6 g / cm 3, and the surface roughness is 10 to 30S.
  • the method according to any one of (1) to (4), wherein the stretching in the widening stretching step is performed by wet stretching, and the temperature of the liquid used is 20 ° C. to 40 ° C. (6)
  • the cumulative stretching ratio up to the widening stretching step (however, when there is no other stretching step up to the step, the stretching ratio in the step) is 2 times or more (1) to (5) The method described.
  • the method for producing a polarizing film of the present invention it is possible to produce a polarizing film having excellent optical properties by suppressing variations in the absorption axis of the obtained polarizing film.
  • Examples of the polyvinyl alcohol-based resin that forms the polyvinyl alcohol-based film in the present invention include those obtained by saponifying a polyvinyl acetate-based resin.
  • the degree of saponification is usually about 85 mol% or more, preferably about 90 mol% or more, more preferably about 99 mol% to 100 mol%.
  • Polyvinyl acetate resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith, such as ethylene-vinyl acetate copolymer. Examples include coalescence.
  • Examples of other copolymerizable monomers include unsaturated carboxylic acids, olefins, vinyl ethers, and unsaturated sulfonic acids.
  • the degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10,000, preferably about 1500 to 5,000.
  • polyvinyl alcohol resins may be modified.
  • polyvinyl formal modified with aldehydes polyvinyl acetal, polyvinyl butyral, and the like may be used.
  • an unstretched film of a polyvinyl alcohol-based resin film having a thickness of about 20 ⁇ m to 100 ⁇ m, preferably about 30 ⁇ m to 80 ⁇ m is used as a starting material for producing a polarizing film.
  • an unstretched film of a polyvinyl alcohol-based resin film having a thickness of about 20 ⁇ m to 100 ⁇ m, preferably about 30 ⁇ m to 80 ⁇ m is used.
  • the width of the film is practically about 1500 mm to 6000 mm.
  • the unstretched film is processed in the order of swelling treatment, dyeing treatment, boric acid treatment (crosslinking treatment), water washing treatment, and finally dried to obtain a polyvinyl alcohol polarizing film having a thickness of, for example, about 5 to 50 ⁇ m. is there.
  • a polarizing film which is a polyvinyl alcohol uniaxially stretched film in which a dichroic dye is adsorbed and oriented is generally obtained by subjecting an unstretched polyvinyl alcohol film to a solution treatment in the order of swelling treatment, dyeing treatment, boric acid treatment and water washing treatment. In addition, it is obtained by carrying out uniaxial stretching in a boric acid treatment step and, if necessary, a previous step by wet or dry method and finally drying.
  • the uniaxial stretching in the present invention may be performed by only one widening stretching process or may be performed by two or more processes.
  • stretching method is employable except having at least 1 widening extending
  • Known stretching methods include inter-roll stretching that stretches with a difference in peripheral speed between two nip rolls that transport the film, a hot roll stretching method as described in Japanese Patent No. 2731813, a tenter stretching method, and the like.
  • the widening and stretching step may be performed a plurality of times. The order of the steps is basically as described above, but there are no restrictions on the number of treatment baths or treatment conditions.
  • the swelling step is performed for the purpose of removing foreign matter from the film surface, removing the plasticizer in the film, imparting easy dyeability in the next step, and plasticizing the film.
  • the treatment conditions are determined within a range in which these objects can be achieved and within a range in which problems such as extreme dissolution and devitrification of the base film do not occur.
  • the film is immersed in an aqueous solution at about 20 ° C. to 70 ° C., preferably about 30 ° C. to 60 ° C.
  • the immersion time of the film is preferably about 30 seconds to 300 seconds, more preferably about 60 seconds to 240 seconds.
  • the film When the unstretched original film is swollen from the beginning, the film is immersed, for example, in an aqueous solution of about 10 ° C. to 50 ° C., preferably about 20 ° C. to 40 ° C.
  • the immersion time of the film is preferably about 30 seconds to 300 seconds, more preferably about 60 seconds to 240 seconds.
  • uniaxial stretching may be performed in the swelling step, and the stretching ratio in that case is usually 1.2 to 3 times, preferably 1.3. ⁇ 2.5 times.
  • boric acid described in JP-A-10-153709
  • chloride described in JP-A-06-281816
  • inorganic acid inorganic salt
  • water solution is used as the swelling treatment bath to be used. It is also possible to use an aqueous solution to which a basic organic solvent, alcohols and the like are added in an amount of about 0.01 to 10% by weight.
  • the dyeing step with the dichroic dye is performed for the purpose of adsorbing and orienting the dichroic dye on the film.
  • the treatment conditions are determined within a range in which these objects can be achieved and within a range in which problems such as extreme dissolution and devitrification of the base film do not occur.
  • An immersion treatment is performed at a concentration of about 0.1 to 10/100 for about 30 seconds to 600 seconds, preferably about 60 seconds to 300 seconds.
  • potassium iodide instead of potassium iodide, other iodides such as zinc iodide may be used. Other iodides may be used in combination with potassium iodide. Further, compounds other than iodide, such as boric acid, zinc chloride, cobalt chloride, etc. may coexist. When boric acid is added, it is distinguished from the following boric acid treatment in that it contains iodine. Any dye containing about 0.003 parts by weight or more of iodine with respect to 100 parts by weight of water can be regarded as a dyeing tank.
  • the immersion treatment is performed at a concentration of about 0.1 / 100 for about 30 seconds to 600 seconds, preferably about 60 seconds to 300 seconds.
  • the aqueous solution of the dichroic dye to be used may have a dyeing assistant or the like, and may contain, for example, an inorganic salt such as sodium sulfate, a surfactant or the like.
  • the dichroic dye may be used alone, or two or more dichroic dyes may be used at the same time.
  • the film When a polyvinyl alcohol film is treated in the order of swelling treatment, dyeing treatment, and boric acid treatment, the film is usually stretched in a dyeing tank.
  • the cumulative draw ratio until the dyeing treatment (or the draw ratio in this step when there is no drawing step before this step) is usually 1.6 to 4.5 times, preferably 1.8 to 4 times.
  • the draw ratio of integration up to the dyeing process is less than 1.6 times, the frequency of film breakage increases, and the yield tends to deteriorate. Stretching is performed by a method of giving a peripheral speed difference between the nip rolls before and after the dyeing tank.
  • a widening roll (expander roll), a spiral roll, a crown roll, a cross guider, a bend bar, and the like can be installed in the dyeing bath and / or at the bath entrance / exit.
  • the uniaxial stretching in the present invention can be applied in any of the swelling process, the dyeing process, the boric acid treatment process, and the washing process.
  • the boric acid treatment is performed by immersing a polyvinyl alcohol film dyed with a dichroic dye in an aqueous solution containing about 1 to 10 parts by weight of boric acid with respect to 100 parts by weight of water.
  • the dichroic dye is iodine
  • iodide include potassium iodide and zinc iodide.
  • compounds other than iodide such as zinc chloride, cobalt chloride, zirconium chloride, sodium thiosulfate, potassium sulfite, sodium sulfate, etc. may coexist.
  • This boric acid treatment is carried out for water resistance, hue adjustment (preventing bluishness, etc.) by crosslinking, and the like.
  • a cross-linking agent such as glyoxal or glutaraldehyde can be used in addition to or together with boric acid, if necessary.
  • the boric acid treatment for water resistance may be referred to by names such as water resistance treatment, crosslinking treatment, and immobilization treatment.
  • boric acid treatment for hue adjustment may be referred to by a name such as complementary color treatment or re-dyeing treatment.
  • This boric acid treatment is performed by appropriately changing the concentrations of boric acid and iodide and the temperature of the treatment bath according to the purpose.
  • the boric acid treatment for water resistance and the boric acid treatment for hue adjustment are not particularly distinguished, but are carried out under the following conditions.
  • about 3 to 10 parts by weight of boric acid and 100% by weight of iodide Is carried out at a temperature of about 50 ° C. to 70 ° C., preferably about 53 ° C. to 65 ° C.
  • the immersion time is usually about 10 to 600 seconds, preferably 20 to 300 seconds, more preferably 20 to 200 seconds.
  • the temperature of the boric acid treatment bath is usually about 50 ° C. to 85 ° C., preferably about 55 ° C. to 80 ° C.
  • boric acid treatment for hue adjustment may be performed.
  • the dichroic dye is iodine
  • a boric acid treatment bath containing about 1 to 5 parts by weight of boric acid and about 3 to 30 parts by weight of iodide for 100 parts by weight of water is used for this purpose. And is usually carried out at a temperature of about 10 ° C to 45 ° C.
  • the immersion time is usually about 1 to 300 seconds, preferably 2 to 100 seconds.
  • boric acid treatments may be performed a plurality of times and are usually performed 2 to 5 times in many cases.
  • the aqueous solution composition and temperature of each boric acid treatment tank to be used may be the same or different within the above range.
  • the boric acid treatment for water resistance and the boric acid treatment for hue adjustment may be performed in a plurality of steps, respectively.
  • the final integrated draw ratio of the polarizing film in the invention is usually about 4.5 to 7 times, preferably about 5 to 6.5 times.
  • boric acid treatment After boric acid treatment, it is washed with water.
  • the water washing treatment is performed, for example, by immersing a polyvinyl alcohol film treated with boric acid for water resistance and / or color tone adjustment in water, spraying water as a shower, or combining immersion and spraying.
  • the temperature of water in the water washing treatment is usually about 2 to 40 ° C., and the immersion time is preferably about 2 to 120 seconds.
  • the polyvinyl alcohol film is dried in a drying furnace at a temperature of about 40 to 100 ° C. for about 60 to 600 seconds to obtain a polarizing film.
  • a widening roll can also be used in the boric acid treatment step and the washing treatment step.
  • these films are uniaxially drawn between two nip rolls. That is, the peripheral speed of the nip roll on the downstream side in the film transport direction is made larger than the peripheral speed of the nip roll on the upstream side, and the film is stretched with tension.
  • At least one of the stretching steps is provided with at least one widening roll between two nip rolls, and is uniaxially stretched while widening the film (widening stretching step).
  • the integral draw ratio up to the widening and stretching step in which the widening roll of the present invention is installed is 1.6 times. As described above, it is preferably 2 times or more, and usually 7 times or less, preferably 6.5 times or less, and thereby the effect of suppressing the variation of the absorption axis is sufficiently exhibited. If the cumulative stretching ratio up to the widening stretching step is less than 1.6 times, there is a risk that it will not be possible to obtain a sufficient absorption axis variation suppressing effect, and as described above, up to the dyeing step where the stretching step is performed.
  • the cumulative stretching ratio is the total sum of the ratios of uniaxial stretching and widening stretching.
  • uniaxial stretching and widening stretching are performed a plurality of times, the total stretching ratio is the sum of all of them.
  • Stretching may be either dry or wet, but is preferably performed by a so-called wet stretching method in which the film is stretched while being immersed in a predetermined solution. Since this wet stretching method is sufficient for the film to be sufficiently stretched and not easily broken, the necessary optical properties are easily obtained, and the degree of polarization is higher than that of the dry stretching method.
  • FIG. 1 is an explanatory view showing an embodiment of the widening and stretching step in the present invention
  • FIG. 2 is a front view showing an example of the widening roll in the present invention.
  • the treatment tank 10 shown in FIG. 1 is filled with a treatment liquid 4 (for example, iodine, potassium iodide aqueous solution), and a nip roll 2 and a downstream side on the upstream side in the transport direction of the polyvinyl alcohol film 1 passing through the treatment tank 10.
  • a treatment liquid 4 for example, iodine, potassium iodide aqueous solution
  • a nip roll 2 ' is installed in the nip roll, and a widening roll 3 and a guide roll 5 are installed between the two nip rolls.
  • the widening roll 3 has a curved shape.
  • the polyvinyl alcohol film 1 is immersed in the treatment liquid 4 and stretched with a difference in peripheral speed between the two nip rolls 2 and 2 ′ while being stretched through the widening roll 3.
  • a plurality of widening rolls 3 may be provided.
  • FIGS. 3A to 3C are explanatory views showing the relationship between the widening direction M of the widening roll and the film carry-out direction.
  • the widening direction M of the widening roll 3 is important for improving the optical characteristics of the polarizing film, and the angle ⁇ of the widening direction M with respect to the unloading direction of the film 1 is ⁇ 40 ° to 70 °, more preferably ⁇ 30 ° to The range is 30 °.
  • FIGS. 3 (a) to 3 (c) when the direction in which the film 1 flows is viewed from the left to the right, the unloading direction of the film 1 is 0 °, and the clockwise angle from the unloading direction is set to 0 °.
  • the radius of curvature of the widening roll 3 to be used is preferably 1000 to 50000 mm, more preferably 10,000 to 40000 mm, and the diameter d of the widening roll 3 is preferably 50 to 300 mm, more preferably 75 to 200 mm.
  • the widening roll 3 may be disposed in the air (in the atmosphere) or in the liquid, but as shown in FIG. 1, the present invention is applied to the widening roll 3 installed in the air.
  • the present invention is applied to the widening roll 3 installed in the air.
  • at least one widening roll 3 is installed in the air and the present invention is applied.
  • Optical characteristics can be improved while suppressing the generation of wrinkles.
  • the present invention is applied to all widening rolls 3, that is, all the widening rolls 3 are divided into two nip rolls 2, It is highly preferred to install between 2 '.
  • Examples of the material for the widening roll during the production process of the present invention include rubber and sponge, but a sponge rubber roll is more preferable.
  • the polyvinyl alcohol film swells in both the longitudinal and width directions due to absorption of the bath solution, but wrinkles and folds are likely to occur on the roll when tension is applied without the swelling in the width direction ending.
  • a sponge rubber roll is used as the widening roll, it can exert a sufficient widening force due to the high film gripping force based on its high surface roughness, and it also demonstrates the meandering prevention function, which is another role of the widening roll. , Wrinkles are reduced and folding is eliminated.
  • the sponge rubber roll used in the present invention has a sponge hardness of about 20 to 60 degrees, more preferably about 25 to 50 degrees, and a density of about 0.4 on the JIS Shore C scale measured by the test method of JIS K 6301. ⁇ 0.6g / cm 3, approximately expressed more preferably about 0.42 ⁇ 0.57g / cm 3 and a surface roughness JIS B 0601 average local peaks of the roughness curve spacing (surface roughness) S It is preferably 10 to 30S, more preferably about 15 to 25S.
  • the temperature of the solution in which the film is immersed may be usually 2 to 70 ° C., but in particular 20 to 40 ° C., preferably 25 to 35 ° C.
  • the film is stretched through a widening roll, it is possible to stretch the film without degrading the optical properties most.
  • tension control may be performed so that the tension of the film becomes substantially constant.
  • tension control it is preferable to perform tension control also for these steps.
  • the tension in each step may be the same or different.
  • the tension applied to the film in the tension control is not particularly limited, and is appropriately set within a range of about 150 N / m to 2000 N / m, preferably about 600 N / m to 1500 N / m per unit width.
  • the tension per unit width is calculated from the film width near the entrance of the process and the tension value of the tension detector.
  • tension control when tension control is performed, there are cases where the film is inevitably slightly stretched or shrunk, but in the present invention, this is not included in the stretching process.
  • a polarizing plate can be obtained by pasting a protective film with an adhesive on at least one surface of the polarizing film thus produced.
  • the protective film for example, a film made of an acetyl cellulose resin such as triacetyl cellulose or diacetyl cellulose, a film made of a polyester resin such as polyethylene terephthalate, polyethylene naphthalate or polybutylene terephthalate, or a film made of a polycarbonate resin , A film made of a cycloolefin resin, an acrylic resin film, and a polypropylene resin film.
  • the polarizing film and / or protective film may be subjected to corona treatment, flame treatment, plasma treatment, ultraviolet irradiation, primer coating treatment, saponification treatment, etc.
  • a surface treatment may be applied.
  • Example 1 While immersing a 75 ⁇ m-thick polyvinyl alcohol film (Kuraray Vinylon VF-PS # 7500, polymerization degree 2,400, saponification degree 99.9 mol% or more) in pure water at 30 ° C., the film is sufficiently swollen, Uniaxial stretching was performed 1.30 times. Next, as shown in FIG. 1, the iodine / potassium iodide / water is immersed in a dyeing bath at 30 ° C. with a weight ratio of 0.02 / 2.0 / 100 and the integrated draw ratio is 2.80 times. Uniaxial stretching was performed.
  • the angle of the widening direction of the widening roll with respect to the carrying-out direction of the film carried out from the widening roll at this time (however, when the film flowing direction is viewed from left to right, the carrying-out direction of the film 1 is 0 °, The clockwise angle from the direction was-and the counterclockwise angle was +) (hereinafter referred to as the holding angle of the widening roll) was carried at 0 °. Thereafter, uniaxial stretching was carried out until the cumulative total draw ratio from the original fabric became 5.5 times while being immersed in a 55 ° C. aqueous solution of potassium iodide / boric acid / water in a weight ratio of 12 / 4.4 / 100.
  • Example 2 A polarizing film was obtained in the same manner as in Example 1 except that the holding angle of the widening roll in the dyeing tank was 30 °. The dispersion of the absorption axis of the obtained polarizing film (difference between maximum and minimum) was 0.08 °.
  • Example 3 A polarizing film was obtained in the same manner as in Example 1 except that the holding angle of the widening roll in the dyeing tank was 60 °. The obtained polarizing film had a variation in absorption axis (difference between maximum and minimum) of 0.12 °.
  • Example 4 A polarizing film was obtained in the same manner as in Example 1 except that the holding angle of the widening roll in the dyeing tank was ⁇ 30 °. The dispersion of the absorption axis of the obtained polarizing film (difference between maximum and minimum) was 0.09 °.
  • Example 5 While immersing a 75 ⁇ m-thick polyvinyl alcohol film (Kuraray Vinylon VF-PS # 7500, polymerization degree 2,400, saponification degree 99.9 mol% or more) in pure water at 30 ° C., the film is sufficiently swollen, Uniaxial stretching was performed 1.30 times. Next, as shown in FIG. 1, the iodine / potassium iodide / water is immersed in a dyeing bath at 30 ° C. with a weight ratio of 0.02 / 2.0 / 100 and the integrated draw ratio is 1.65 times. Uniaxial stretching was performed. The holding angle of the widening roll at this time was conveyed at 0 °.
  • Example 6 A polarizing film was obtained in the same manner as in Example 5 except that the holding angle of the widening roll in the dyeing tank was 30 °. The obtained polarizing film had a variation in absorption axis (difference between maximum and minimum) of 0.13 °.
  • Example 7 A polarizing film was obtained in the same manner as in Example 5 except that the holding angle of the widening roll in the dyeing tank was 60 °. The variation in absorption axis (maximum and minimum difference) of the obtained polarizing film was 0.15 °.
  • Example 1 A polarizing film was obtained in the same manner as in Example 1 except that the holding angle of the widening roll in the dyeing tank was 90 °. The obtained polarizing film had a variation in absorption axis (difference between maximum and minimum) of 0.23 °.
  • Example 2 A polarizing film was obtained in the same manner as in Example 5 except that the holding angle of the widening roll in the dyeing tank was 90 °. The obtained polarizing film had a variation in absorption axis (difference between maximum and minimum) of 0.24 °.
  • Examples 1 to 4 and Comparative Example 1 described above are shown below. From Table 1, it can be seen that Examples 1 to 7 have less absorption axis variation (maximum-minimum difference) than Comparative Examples 1 and 2.
  • Example 8 In the swelling tank, uniaxial stretching as shown in FIG. 1 is performed through a widening roll in the air with a hugging angle of 0 °, and then, as shown in FIG. A polarizing film was obtained in the same manner as in Example 1 except that the uniaxial stretching as shown in FIG. 1 was performed at 2.80 times (the holding angle of the widening roll in the dyeing tank was 0 °). The obtained polarizing film had a variation in absorption axis (difference between maximum and minimum) of 0.11 °.
  • Example 3 A polarizing film was obtained in the same manner as in Example 8 except that the holding angle of the widening roll in the swelling tank was 90 °. The obtained polarizing film had a variation in absorption axis (difference between maximum and minimum) of 0.34 °.
  • Example 8 has lower absorption axis variation (maximum-minimum difference) than Comparative Example 3.

Abstract

Un procédé de fabrication d'un film de polarisation d'après la présente invention comprend les étapes au cours desquelles un film à base d'alcool polyvinylique (1) est séquentiellement soumis à un traitement d'expansion, à un traitement de coloration, à un traitement à l'acide borique et à un traitement de nettoyage. Le film à base d'alcool polyvinylique (1) est étiré uniaxialement avant ou pendant l'une quelconque desdites étapes en utilisant la différence de vitesse circonférentielle entre deux rouleaux pinceurs (2, 2'). Le procédé de fabrication d'un film de polarisation comprend en outre une étape au cours de laquelle au moins un rouleau large (3) est disposé entre les deux rouleaux pinceurs (2, 2') de façon à procéder à un élargissement et à un étirement uniaxial. Jusqu'à l'étape d'élargissement (cette étape comprise), le rapport d'étirage cumulé est supérieur ou égal à 1,6 (le rapport d'étirage de l'étape d'élargissement lorsqu'aucune autre étape d'étirement n'a été mise en œuvre avant l'étape d'élargissement). Au cours de l'étape d'élargissement, l'angle entre la direction d'élargissement du rouleau large (3) et la direction de délivrance du film (1) délivré à partir du rouleau large (3) se situe entre -40° et 70° (si la direction de déplacement du film est observée de gauche à droite, la direction de délivrance du film depuis le rouleau large est égale à 0°, les angles en sens horaire à partir de la direction de délivrance sont négatifs (-) et les angles en sens anti-horaire sont positifs (+)).
PCT/JP2011/064169 2010-06-22 2011-06-21 Procédé de fabrication d'un film de polarisation WO2011162259A1 (fr)

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US20220057560A1 (en) * 2020-08-18 2022-02-24 Dongwoo Fine-Chem Co., Ltd. Polarizing plate for antireflection and display device comprising the same
US11536886B2 (en) 2017-06-26 2022-12-27 3M Innovative Properties Company Roll of film including multilayer birefringent reflective polarizer having low pass axis variation

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WO2014115897A1 (fr) * 2013-01-28 2014-07-31 住友化学株式会社 Procédé de fabrication de film polarisant
KR101460478B1 (ko) * 2013-06-18 2014-11-10 주식회사 엘지화학 연신 적층체, 박형 편광자의 제조 방법, 이를 이용하여 제조되는 박형 편광자 및 이를 포함하는 편광판
CN106575008B (zh) * 2014-08-04 2019-12-24 住友化学株式会社 偏振膜的制造方法
CN105729962B (zh) * 2014-12-24 2018-01-05 住友化学株式会社 偏振膜、偏振片和偏振膜的制造方法
JP6067158B1 (ja) * 2015-07-27 2017-01-25 住友化学株式会社 偏光フィルムの製造方法
JP6017010B1 (ja) 2015-12-22 2016-10-26 住友化学株式会社 リチウムイオン二次電池用セパレータフィルムの製造方法およびリチウムイオン二次電池用セパレータフィルムの製造装置
JP6378731B2 (ja) * 2016-02-08 2018-08-22 住友化学株式会社 積層光学フィルムの製造方法
JP7308905B2 (ja) * 2017-09-26 2023-07-14 住友化学株式会社 光学フィルムの製造方法及び製造装置
JP7083611B2 (ja) * 2017-09-26 2022-06-13 住友化学株式会社 フィルムの搬送方法及び搬送装置、ならびに処理フィルムの製造方法及び製造装置
JP6979839B2 (ja) * 2017-09-26 2021-12-15 住友化学株式会社 光学フィルムの製造方法及び製造装置
KR102489222B1 (ko) * 2018-09-28 2023-01-17 엘지디스플레이 주식회사 롤러블 표시장치
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KR101760541B1 (ko) 2017-07-21
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JP4902801B2 (ja) 2012-03-21
TWI524098B (zh) 2016-03-01
KR20130098275A (ko) 2013-09-04
CN102947735B (zh) 2015-04-29
JP2012027459A (ja) 2012-02-09

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