WO2022202861A1 - ポリビニルアルコール系フィルム、およびその製造方法、ならびにそれを用いた偏光膜、偏光板 - Google Patents

ポリビニルアルコール系フィルム、およびその製造方法、ならびにそれを用いた偏光膜、偏光板 Download PDF

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WO2022202861A1
WO2022202861A1 PCT/JP2022/013349 JP2022013349W WO2022202861A1 WO 2022202861 A1 WO2022202861 A1 WO 2022202861A1 JP 2022013349 W JP2022013349 W JP 2022013349W WO 2022202861 A1 WO2022202861 A1 WO 2022202861A1
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Prior art keywords
film
polyvinyl alcohol
thickness
polarizing
drying
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PCT/JP2022/013349
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English (en)
French (fr)
Japanese (ja)
Inventor
和也 湯山
秀一 北村
俊宏 清水
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Mitsubishi Chemical Corp
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Mitsubishi Chemical Corp
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Priority to KR1020237029447A priority Critical patent/KR20230160238A/ko
Priority to CN202280017658.6A priority patent/CN116997451A/zh
Priority to JP2023509225A priority patent/JPWO2022202861A1/ja
Publication of WO2022202861A1 publication Critical patent/WO2022202861A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
    • B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/52—Measuring, controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

Definitions

  • the present invention relates to a polyvinyl alcohol-based film, and more specifically, it is effective in reducing tension during stretching and reducing defects during the production of a polarizing film, and by suppressing breakage during stretching and defects exceeding the specifications, the film can be manufactured with a high yield.
  • the present invention relates to a polyvinyl alcohol-based film that can be used, a manufacturing method, and a polarizing film and a polarizing plate using the polyvinyl alcohol-based film.
  • a polarizing film is manufactured by swelling a polyvinyl alcohol-based film, which is the original film, with water (including hot water), dyeing it with a dichroic dye such as iodine, and stretching the film.
  • a swelling process it is important to swell the polyvinyl alcohol film quickly, and to swell the polyvinyl alcohol film uniformly so that the dye can smoothly enter the inside of the film in the dyeing process.
  • the stretching step is a step of stretching the dyed film in the machine direction (MD) to highly orient the dichroic dye in the film. In the stretching step, it is important that the polyvinyl alcohol-based film, which is the original fabric, exhibits good stretchability in the machine direction (MD).
  • Techniques for improving the above-mentioned stretchability include, for example, a technique of controlling the speed of the cast drum and the final winding speed (see, for example, Patent Document 1), the length of the birefringence averaged in the thickness direction of the polyvinyl alcohol film, A polyvinyl alcohol-based film has been proposed that satisfies a specific relational expression for each value in the width direction and the width direction (see, for example, Patent Document 2).
  • the elution amount of the polyvinyl alcohol-based resin when immersed in water at 50 ° C. for 1 minute is 900 ppm / m 2 or less
  • a polyvinyl alcohol-based film characterized by a short-side curl angle of 135° or less measured under specific conditions see, for example, Patent Document 3).
  • Patent Document 2 Although the technology disclosed in Patent Document 2 can exhibit high stretchability, there is room for improvement in reducing the elution of the polyvinyl alcohol-based resin in the swelling process.
  • the present invention provides a polyvinyl alcohol-based film that has excellent stretchability during the production of a polarizing film, suppresses breakage, and is capable of obtaining a polarizing film having excellent polarizing performance, and is immersed in water.
  • Polyvinyl alcohol-based film that can reduce the amount of polyvinyl alcohol-based resin eluted during processing and does not contaminate polarizing film manufacturing equipment, a method for manufacturing the same, and a polarizing film and a polarizing plate using the polyvinyl alcohol-based film I will provide a.
  • a polyvinyl alcohol-based film in which the orientation of the surface layer and the core layer in the thickness direction of the polyvinyl alcohol-based film is controlled within a specific range is produced at the time of manufacturing the polarizing film. , it is effective in reducing the elution amount of the polyvinyl alcohol-based resin and in reducing the tension during stretching, thereby obtaining a polarizing film with few defects and suppressing contamination of the polarizing film manufacturing equipment.
  • the present invention provides the following [1] to [13].
  • [1] A polyvinyl alcohol-based film, The difference between the birefringence distribution MD ⁇ n in the thickness direction of the film piece obtained by slicing the polyvinyl alcohol film in the MD direction and the birefringence distribution TD ⁇ n in the thickness direction of the film piece obtained by slicing the polyvinyl alcohol film in the TD direction
  • MD ⁇ n ⁇ TD ⁇ n in the thickness direction of the film In a certain orientation distribution MD ⁇ n ⁇ TD ⁇ n in the thickness direction of the film,
  • Each peak top value in each range of 40% at both ends in the film thickness direction out of 100% of the total thickness of the film is defined as s1 and s2, and the central 20% range in the thickness direction of the film out of 100% of the total thickness of the film.
  • a polarizing plate comprising the polarizing film according to [5] and a protective film provided on at least one side of the polarizing film.
  • Step (C) A step of heating and drying the formed film by bringing it into contact with a plurality of hot rolls.
  • Condition (c1) The temperature of the hot rolls contacting the film with a film moisture content of more than 11% by mass is 50 to 90°C.
  • Condition (c2) When the moisture content of the film becomes 11% by mass or less, the temperature of the heat roll with which the surface of the film opposite to the surface in contact with the casting mold first contacts is 100° C. or higher.
  • the polyvinyl alcohol-based film of the present invention is a film that has good stretchability during the production of the polarizing film and is difficult to break, so that high stretching is possible and a polarizing film having high polarizing performance can be obtained. Since the elution of the resin can be suppressed, contamination of the polarizing film manufacturing equipment can be suppressed, and a polarizing film with few defects can be obtained.
  • FIG. 4 is an explanatory diagram schematically showing an example of the orientation distribution MD ⁇ n ⁇ TD ⁇ n in the thickness direction of a film according to an example of the embodiment of the present invention.
  • FIG. 4 is an explanatory diagram schematically showing an example of the orientation distribution MD ⁇ n ⁇ TD ⁇ n in the thickness direction of a film according to an example of the embodiment of the present invention.
  • a polyvinyl alcohol-based film according to an example of the embodiment of the present invention is a film piece obtained by slicing the polyvinyl alcohol-based film in the MD direction, and the birefringence distribution in the thickness direction of the film piece In the orientation distribution MD ⁇ n ⁇ TD ⁇ n in the thickness direction of the film, which is the difference between MD ⁇ n and the birefringence distribution TD ⁇ n in the thickness direction of a film piece obtained by slicing the polyvinyl alcohol film in the TD direction, both ends in the thickness direction of the film
  • s2 where
  • the central 20% range refers to the central 20% area in the thickness direction of the entire film ( ⁇ 10% relative to the center in the film thickness direction) when the entire film (total thickness) is 100%. area), and each of the 40% ranges at both ends is each 40% located on both sides of the central 20% area in the thickness direction when the entire film (total thickness) is taken as 100% is the area of
  • the central 20% range may be referred to as a core layer, and each of the two end 40% ranges may be referred to as a surface layer.
  • the polyvinyl alcohol-based film must satisfy at least one of the above formulas (1) and (2).
  • the object of the present invention cannot be achieved with a polyvinyl alcohol film that does not satisfy the above formula (1) or (2), because the balance between high stretchability and low elution of the polyvinyl alcohol resin during the production of the polarizing film is poor.
  • the present polyvinyl alcohol-based film preferably satisfies the above formula (1), and preferably satisfies both the above formulas (1) and (2), from the viewpoint of an excellent balance between low elution and high stretchability. more preferred.
  • the present inventors found that in the orientation distribution MD ⁇ n ⁇ TD ⁇ n in the thickness direction of the film, if the difference between the peak top value in the surface layer of the film and the average value of the core layer is too large than a predetermined value, It is inferior in stretchability and tends to be easily broken. On the other hand, when the difference is too small than a predetermined value, the amount of elution of the polyvinyl alcohol film tends to increase. The inventors have found that by controlling the amount, it is possible to provide a polyvinyl alcohol-based film having an excellent balance between low elution property and high drawability during the production of a polarizing film.
  • a polymer satisfying ⁇ n>0 is called a positive polymer
  • a polymer satisfying ⁇ n ⁇ 0 is called a negative polymer
  • polyvinyl alcohol is known to be a positive polymer.
  • when light is incident on a polymer it splits into polarized waves parallel to and perpendicular to the optical axis due to the orientation of the polymer.
  • the thickness direction distribution of the MD refractive index is defined as nMD
  • the thickness direction distribution of the TD refractive index is defined as nTD
  • the thickness direction distribution of the thickness refractive index is defined as nZ
  • the birefringence in the thickness direction when the film is sliced in the MD direction can be described as nMD-nZ
  • the birefringence distribution in the thickness direction when sliced in the TD direction can be described as nTD-nZ.
  • the former is expressed as MD ⁇ n and the latter as TD ⁇ n.
  • FIG. 1 An example of the orientation distribution MD ⁇ n ⁇ TD ⁇ n in the film thickness direction in the present invention is schematically shown in FIG.
  • s1 the relatively large peak top value
  • s2 the relatively small peak top value
  • c the average value of the values within the central 20% range (core layer) in the thickness direction of the film.
  • c the difference between the relatively large peak top value ⁇ s1 and the average value ⁇ c in the orientation distribution MD ⁇ n ⁇ TD ⁇ n in the film thickness direction is 0.5.
  • the polyvinyl alcohol-based film preferably satisfies the following formula (1′), and particularly preferably satisfies the following formula (1′′), in terms of an excellent balance between low elution property and high stretchability.
  • the polyvinyl alcohol-based film preferably satisfies the following formula (2′), and particularly preferably satisfies the following formula (2′′), in terms of an excellent balance between low elution property and high stretchability. 0.00050 ⁇
  • the polyvinyl alcohol film of the present invention preferably has a value of c satisfying the following formula (3). ⁇ 0.00050 ⁇ c ⁇ 0.0005 (3)
  • the polyvinyl alcohol-based film particularly preferably satisfies the following formula (3′), more preferably satisfies the following formula (3′′), and satisfies the following formula (3′′′): It is particularly preferred to fill ⁇ 0.00050 ⁇ c ⁇ 0 (3′) ⁇ 0.00048 ⁇ c ⁇ 0.00005 (3′′) ⁇ 0.00045 ⁇ c ⁇ 0.00010 (3′′′)
  • this polyvinyl alcohol-based film has 0% of the thickness position of the film surface on the side close to s1 out of 100% of the entire thickness of the film, and the film on the side close to s2. Assuming that the thickness position of the surface is 100%, the thickness position of the value represented by
  • /2 is particularly preferably within the range of 4.5 to 6.8% from the viewpoint of excellent balance between low dissolution and high stretchability. It is more preferably in the range of 0.0 to 6.5%.
  • FIG. 2 schematically shows values represented by
  • ⁇ By controlling the thickness position of the value represented by s1- ⁇ c
  • the film formed in the cast mold is peeled from the cast mold.
  • a method of drying using a hot roll that satisfies predetermined conditions is preferred.
  • the temperature of the hot rolls contacting the film with a film moisture content of more than 11% by mass is all set to 50 to 90 ° C. (condition (c1)), and the surface that comes into contact with the casting mold when the film moisture content is 11% by mass or less. It is preferable to set the temperature of the heat roll with which the film surface on the opposite side first contacts to 100° C. or higher (condition (c2)).
  • the present inventors have found that in the drying process in the manufacturing process of a polyvinyl alcohol film, there is a difference in the timing at which drying and heat treatment are effective between the surface layer and the core layer of the film due to the effect of the gradient of the moisture content from the surface layer to the core layer of the film. Focusing on a certain point, it was found that the orientation of the surface layer and the core layer of the film can be suitably controlled by adjusting the moisture content, drying conditions, and heat treatment conditions of the film, and further, the surface layer and the core layer of the film. By controlling the orientation of the above formulas (1) and / or (2), we have found an optimum orientation distribution that can achieve both high stretchability and low elution when manufacturing a polarizing film. It is.
  • the method for producing the polyvinyl alcohol-based film will be described in more detail below in order of steps, but the method for producing the polyvinyl alcohol-based film is not limited to these embodiments.
  • the present polyvinyl alcohol-based film is preferably produced through the following steps (A) to (C), and more preferably produced through the following steps (A) to (C) and further through the step (D).
  • a resin obtained by saponifying a copolymer of vinyl acetate and a small amount (usually 10 mol % or less, preferably 5 mol % or less) of a component copolymerizable with vinyl acetate can also be used.
  • Components copolymerizable with vinyl acetate include, for example, unsaturated carboxylic acids (including salts, esters, amides, nitriles, etc.), olefins having 2 to 30 carbon atoms (eg, ethylene, propylene, n-butene, , isobutene, etc.), vinyl ethers, unsaturated sulfonates, and the like.
  • Modified polyvinyl alcohol-based resins obtained by chemically modifying hydroxyl groups after saponification can also be used. These can be used alone or in combination of two or more.
  • a polyvinyl alcohol resin having a 1,2-diol structure in a side chain can be used as the polyvinyl alcohol resin used for the polyvinyl alcohol film.
  • a polyvinyl alcohol resin having a 1,2-diol structure in the side chain can be produced by, for example, (i) a method of saponifying a copolymer of vinyl acetate and 3,4-diacetoxy-1-butene, (ii) acetic acid (iii) saponifying and decarboxylating a copolymer of vinyl and vinyl ethylene carbonate, (iii) saponifying and decarboxylating a copolymer of vinyl acetate and 2,2-dialkyl-4-vinyl-1,3-dioxolane (iv) a method of saponifying a copolymer of vinyl acetate and glycerin monoallyl ether; and the like.
  • the weight average molecular weight of the polyvinyl alcohol-based resin used in the polyvinyl alcohol-based film is preferably 100,000 to 300,000, particularly preferably 110,000 to 280,000, further preferably 120,000 to 260,000. If the weight-average molecular weight is too small, it tends to be difficult to obtain sufficient optical performance when the polyvinyl alcohol-based resin is used as an optical film. tends to be difficult.
  • the weight average molecular weight of the polyvinyl alcohol resin is the weight average molecular weight measured by the GPC-MALS method.
  • the average degree of saponification of the polyvinyl alcohol-based resin used in the polyvinyl alcohol-based film is generally preferably 98 mol% or more, particularly preferably 99 mol% or more, still more preferably 99.5 mol% or more, and particularly preferably 99.5 mol% or more. is 99.8 mol % or more. If the average degree of saponification is too small, there is a tendency that sufficient optical performance cannot be obtained when the polyvinyl alcohol film is used as a polarizing film.
  • the average degree of saponification in the present invention is measured according to JIS K6726.
  • the resin concentration of the polyvinyl alcohol resin aqueous solution thus obtained is preferably 15 to 60% by mass, particularly preferably 17 to 55% by mass, further preferably 20 to 50% by mass. If the resin concentration of the aqueous solution is too low, the drying load tends to increase, resulting in a decrease in production capacity.
  • the resulting polyvinyl alcohol-based resin aqueous solution is defoamed.
  • defoaming methods include static defoaming and defoaming using a multi-screw extruder.
  • the multi-screw extruder any multi-screw extruder having a vent may be used, and a twin-screw extruder having a vent is usually used.
  • the step (B) is a step of casting the polyvinyl alcohol-based resin aqueous solution into a cast mold to form a film. After the defoaming treatment, the polyvinyl alcohol-based resin aqueous solution is introduced into a T-shaped slit die in fixed amounts, discharged and cast onto a rotating cast drum, and formed into a film by a continuous casting method.
  • the resin temperature of the polyvinyl alcohol resin aqueous solution at the exit of the T-shaped slit die is preferably 80 to 100°C, particularly preferably 85 to 98°C. If the resin temperature is too low, it tends to flow poorly, and if it is too high, it tends to foam.
  • the viscosity of the polyvinyl alcohol-based resin aqueous solution is preferably 50 to 200 Pa ⁇ s, particularly preferably 70 to 150 Pa ⁇ s, at the time of ejection. If the viscosity is too high, the liquid tends to flow poorly, and if it is too low, casting film formation tends to be difficult.
  • the discharge speed of the polyvinyl alcohol resin aqueous solution discharged from the T-type slit die onto the cast drum is preferably 0.2 to 5 m/min, particularly preferably 0.4 to 4 m/min, and more preferably 0.4 m/min. 6 to 3 m/min. If the ejection speed is too slow, productivity tends to decrease, and if it is too fast, casting tends to be difficult.
  • the diameter of the casting drum is preferably 2-5 m, particularly preferably 2.4-4.5 m, more preferably 2.8-4 m. If the diameter is too small, the drying section on the cast drum will be shortened, making it difficult to increase the speed.
  • the surface temperature of the hot roll (hereinafter sometimes referred to as "heat roll temperature”) is not particularly limited, it is usually 50 to 150°C, preferably 70 to 140°C. When the surface temperature is too low, the drying tends to be poor, and when the surface temperature is too high, the drying is excessive, which tends to cause appearance defects such as waviness.
  • the heat roll with which the film moisture content is 11% by mass or less and the film surface opposite to the surface in contact with the casting mold first contacts means an arbitrary hot roll (R1) located on the upstream side among the plurality of hot rolls used in step (C), and a hot roll (R2 ), the moisture content of the film after passing through the heating roll (R1) was measured in the heating roll (R3) installed adjacent to the downstream side of the heating roll (R2), and the moisture content of the film became 11% by mass or less for the first time.
  • the polyvinyl alcohol-based film obtained by the production method according to one example of the embodiment of the present invention is useful for optics. In particular, it is very useful as a raw film for producing a polarizing film.
  • a method for producing a polarizing film and a polarizing plate made of the polyvinyl alcohol-based film will be described below.
  • the lamination method is performed by a known method.
  • a liquid adhesive composition is uniformly applied to the polarizing film, the protective film, or both, and then the two are laminated and pressure-bonded, followed by heating or It is performed by irradiating with active energy rays.
  • the thickness position of the film surface on the side close to s1 is 0%
  • the thickness position of the film surface on the side close to s2 is A half value of
  • Example 1> (Preparation of polyvinyl alcohol film) 1,000 kg of polyvinyl alcohol resin having a weight average molecular weight of 142,000 and a saponification degree of 99.8 mol%, 2,500 kg of water, 105 kg of glycerin as a plasticizer, and dodecyl sulfone as a surfactant are placed in a 5,000 L dissolving can. 0.25 kg of sodium phosphate was added, and the temperature was raised to 150° C. while stirring to perform pressurization and dissolution to obtain an aqueous polyvinyl alcohol resin solution having a resin concentration of 25% by mass.
  • Example 2 In Example 1, the surface opposite to the surface of the film that first came into contact with the cast mold was dried at 102° C. using the heated roll (the ninth heated roll) that came into contact for the first time after the moisture content reached 11% by mass, A polyvinyl alcohol film (width 5 m, thickness 60 ⁇ m, length 5 km) was obtained in the same manner as in Example 1, except that the surface in contact with the casting mold was dried at 102° C. on the subsequent 10th hot roll. The properties of the obtained polyvinyl alcohol film were as shown in Table 1. Furthermore, a polarizing film was obtained in the same manner as in Example 1 using the obtained polyvinyl alcohol film. The properties of the obtained polarizing film were as shown in Table 2.
  • Example 3 a film was formed by discharging and casting from the T-shaped slit die outlet to a cast drum (surface temperature of 85 ° C.) rotating at 10 m / min, and the contact was made for the first time after the moisture content reached 11% by mass.
  • a hot roll (5th hot roll)
  • the side of the film opposite to the side that first contacted the casting mold was dried at 107°C, followed by the 6th hot roll, drying the side that contacted the casting mold at 106°C.
  • the film was dried at 70 to 50°C (average 55°C) using the 7th to 15th hot rolls, and then heat-treated by blowing hot air of 93°C from both sides of the film.
  • Example 2 the surface opposite to the surface of the film that first came into contact with the cast mold was dried at 60° C. using the heated roll (the ninth heated roll) that came into contact for the first time after the moisture content reached 11% by mass, Subsequently, the surface in contact with the cast mold is dried at 60° C. on the tenth hot roll, then dried at 50° C. using the 11th to 15th hot rolls, and then heat-treated by blowing hot air at 125° C. from both sides of the film.
  • a polyvinyl alcohol film (width 5 m, thickness 60 ⁇ m, length 5 km) was obtained in the same manner as in Example 1, except that it was carried out. The properties of the obtained polyvinyl alcohol film were as shown in Table 1.
  • the orientation of the surface layer and the core layer in the thickness direction is within a specific range
  • the polyvinyl alcohol film of Example 3 has one surface layer in the thickness direction. Since the orientation of the core layer is within a specific range, the amount of elution from the film is low, and the critical draw ratio is high. A small number of polarizing films were obtained. On the other hand, since the polyvinyl alcohol film of Comparative Example 1 has a large amount of elution from the film, it can be seen that the obtained polarizing film has a large number of defects.

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  • Manufacturing & Machinery (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • General Physics & Mathematics (AREA)
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  • Polarising Elements (AREA)
PCT/JP2022/013349 2021-03-24 2022-03-23 ポリビニルアルコール系フィルム、およびその製造方法、ならびにそれを用いた偏光膜、偏光板 Ceased WO2022202861A1 (ja)

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KR1020237029447A KR20230160238A (ko) 2021-03-24 2022-03-23 폴리비닐알코올계 필름, 및 이의 제조 방법, 및 이를 이용한 편광막, 편광판
CN202280017658.6A CN116997451A (zh) 2021-03-24 2022-03-23 聚乙烯醇系薄膜及其制造方法、以及使用其的偏光膜、偏光板
JP2023509225A JPWO2022202861A1 (https=) 2021-03-24 2022-03-23

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