WO2020012732A1 - Procédé de production d'un film optique - Google Patents

Procédé de production d'un film optique Download PDF

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Publication number
WO2020012732A1
WO2020012732A1 PCT/JP2019/014767 JP2019014767W WO2020012732A1 WO 2020012732 A1 WO2020012732 A1 WO 2020012732A1 JP 2019014767 W JP2019014767 W JP 2019014767W WO 2020012732 A1 WO2020012732 A1 WO 2020012732A1
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Prior art keywords
dope
temperature
casting
optical film
casting die
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PCT/JP2019/014767
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English (en)
Japanese (ja)
Inventor
祐樹 穂北
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コニカミノルタ株式会社
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Priority to JP2020529990A priority Critical patent/JPWO2020012732A1/ja
Priority to KR1020217000296A priority patent/KR102356401B1/ko
Priority to CN201980045835.XA priority patent/CN112423959B/zh
Publication of WO2020012732A1 publication Critical patent/WO2020012732A1/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
    • 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
    • B29C41/28—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 an endless belt
    • 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
    • B29C41/36—Feeding the material on to the mould, core or other substrate
    • 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
    • B29C41/42—Removing articles from moulds, cores or other substrates
    • B29C41/44—Articles of indefinite length
    • 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
    • B29C41/46—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • B29D11/00788—Producing optical films

Definitions

  • the present invention relates to a method for producing an optical film by a solution casting method.
  • optical films used for display devices have been demanded to be thin and water-blocking (low water permeability).
  • Conventional optical films containing cellulose acylate do not satisfy required requirements because of their high water permeability.
  • a resin having a low SP value has a weaker interaction between molecules than cellulose acylate, so that the viscosity of the dope containing such a resin is low. Then, in the solution casting using the dope, when the dope is cast and transported on the support, the dope is formed on the support under the influence of the surrounding wind (wind pressure, wind speed) and temperature. The surface of the casting film is easily deformed (surface irregularities are easily generated). As a result, the thickness of the formed film becomes uneven. In addition, the surface deformation of the casting film causes uneven orientation of molecules during stretching, which appears as a phase difference deviation.
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide an optical film capable of reducing a film thickness deviation and a phase difference deviation in a solution casting using a resin having a low SP value. It is to provide a method for producing a film.
  • the method for producing an optical film according to one aspect of the present invention is a method for producing an optical film by producing an optical film by a solution casting method
  • a dope is prepared by dissolving a resin having an SP value of 10.5 (MPa) 1/2 or less as a solubility parameter in a solvent in a dissolving pot to prepare a dope, and transferring the dope to a casting die via an intermediate pot.
  • T1 Temperature (° C.) of the dope immediately after leaving the melting pot
  • T2 temperature of the dope immediately after leaving the intermediate pot (° C.)
  • T3 temperature of the dope immediately before entering the casting die (° C.) It is.
  • the film thickness deviation and the phase difference deviation can be reduced in a solution casting using a resin having a low SP value.
  • FIG. 1 is an explanatory diagram illustrating a schematic configuration of an optical film manufacturing apparatus 50 according to the present embodiment.
  • FIG. 2 is a flowchart showing a flow of a manufacturing process of the optical film.
  • the method for producing an optical film according to the present embodiment is a method for producing an optical film by a solution casting method, and as shown in FIG. 2, a dope transfer step (S1), a casting step (S2), and a peeling step. (S3), a first drying step (S4), a stretching step (S5), a second drying step (S6), a cutting step (S7), an embossing step (S8), and a winding step (S9).
  • S1 dope transfer step
  • S2 a casting step
  • S3 a peeling step.
  • S4 a first drying step
  • S5 a stretching step
  • S6 second drying step
  • S7 a cutting step
  • S8 embossing step
  • winding step S9
  • the dope fed to the casting die 2 by the dope transfer unit 1 is transferred from the casting die 2 to a casting position on a support 3 made of a rotary drive stainless steel endless belt for infinitely transferring the dope. Extend.
  • the support 3 transports the cast dope (cast dope) while supporting it. Thus, a casting film (web) 5 is formed on the support 3.
  • the support 3 is held by a pair of rolls 3a and 3b and a plurality of rolls (not shown) located between them.
  • One or both of the rolls 3a and 3b are provided with a driving device (not shown) for applying tension to the support 3, whereby the support 3 is used under tension.
  • the web 5 formed by the dope cast on the support 3 is heated on the support 3 and the solvent is evaporated from the support 3 until the web 5 can be peeled off by the peeling roll 4. Let it.
  • evaporate the solvent there are a method of blowing air from the web side, a method of transferring heat from the back surface of the support 3 by liquid, a method of transferring heat from the front and back by radiant heat, and the like, which is used alone or in combination as appropriate. Just fine.
  • the residual solvent amount of the web 5 on the support 3 at the time of peeling is desirably in the range of 25 to 120% by mass depending on the strength of the drying conditions, the length of the support 3, and the like.
  • the amount of solvent is determined.
  • the residual solvent amount is defined by the following equation.
  • Residual solvent amount (mass%) (mass before heat treatment of web ⁇ mass after heat treatment of web) / (mass after heat treatment of web) ⁇ 100
  • the heat treatment at the time of measuring the amount of residual solvent means that heat treatment is performed at 115 ° C. for one hour.
  • the web 5 peeled from the support 3 by the peeling roll 4 is dried by the drying device 6.
  • the drying device 6 the web 5 is transported by a plurality of transport rolls, during which the web 5 is dried.
  • the drying method in the drying device 6 is not particularly limited, and the web 5 is generally dried using hot air, infrared rays, a heating roll, a microwave, or the like. From the viewpoint of simplicity, a method of drying the web 5 with hot air is preferred. Note that the first drying step may be performed as needed.
  • the stretching direction at this time is either a film transport direction (MD direction; Machine Direction), a width direction perpendicular to the transport direction in the film plane (TD direction; Transverse Direction), or both of these directions.
  • MD direction film transport direction
  • TD direction width direction perpendicular to the transport direction in the film plane
  • a tenter method in which both side edges of the web 5 are fixed with clips or the like and stretched is preferable in order to improve the flatness and dimensional stability of the film.
  • drying may be performed in addition to stretching.
  • the stretching step of S5 may be performed as needed, and can be omitted.
  • the stretching step before winding can be omitted.
  • the web 5 stretched by the tenter 7 as required is dried by the drying device 8.
  • the drying device 8 the web 5 is transported by a plurality of transport rolls, during which the web 5 is dried.
  • the drying method in the drying device 8 is not particularly limited, and the web 5 is generally dried using hot air, infrared rays, a heating roll, a microwave, or the like. From the viewpoint of simplicity, a method of drying the web 5 with hot air is preferred. Before entering the drying device 8, a step of roughly cutting both width end portions of the web 5 may be performed.
  • the web 5 is dried by the drying device 8
  • the web 5 is conveyed as an optical film F toward the winding device 11.
  • the cutting unit 9 and the embossing unit 10 are arranged between the drying device 8 and the winding device 11 in this order.
  • a cutting step of cutting both ends in the width direction by a slitter while transporting the formed optical film F is performed.
  • the portions remaining after the cutting at both ends constitute a product part to be a film product.
  • the portion cut from the optical film F is collected by a shooter and reused again as a part of raw materials for forming a film.
  • embossing is performed by the embossed portion 10 on both ends in the width direction of the optical film F.
  • the embossing is performed by pressing a heated emboss roller against both ends of the optical film F. Fine irregularities are formed on the surface of the embossing roller. By pressing the embossing roller against both ends of the optical film F, the irregularities are formed on the both ends.
  • the optical film F on which the embossing has been completed is wound up by the winding device 11 to obtain the original roll (film roll) of the optical film F. That is, in the winding step, a film roll is manufactured by winding the optical film F around a core while transporting the same.
  • the winding method of the optical film F may use a commonly used winder, and there is a method of controlling tension such as a constant torque method, a constant tension method, a taper tension method, and a program tension control method for constant internal stress. You can use them properly.
  • the winding length of the optical film F is preferably from 1,000 to 15,000 m. In this case, the width is desirably 1000 to 3200 mm, and the film thickness is desirably 10 to 60 ⁇ m.
  • a resin having an SP value as a solubility parameter (Solubility Parameter) of 10.5 (MPa) 1/2 or less is dissolved in a solvent in a dissolving vessel 21 to prepare a dope, and the dope is transferred to an intermediate vessel. It is transferred to the casting die 2 via 22. In the intermediate pot 22, the dope is temporarily held, whereby air and bubbles in the dope are removed. The dope in the melting pot 21 is transferred to the intermediate pot 22 through the conduit 23, and the dope in the intermediate pot 22 is transferred to the casting die 2 through the conduit 24.
  • At least one heat exchanger 25 is provided between the intermediate pot 22 and the casting die 2.
  • the conduit 24 is heated or cooled by a heating medium or a cooling medium, so that the dope passing through the conduit 24, that is, the dope flowing from the intermediate tank 22 toward the casting die 2 is heated or cooled. Is done.
  • a plurality of heat exchangers 25 are provided between the intermediate pot 22 and the casting die 2, it is possible to heat the dope once and then cool it, or to cool it once and then heat it.
  • Examples of the resin having an SP value of 10.5 (MPa) 1/2 or less include a cycloolefin resin (SP value: 9.6 (MPa) 1/2 ) and a polycarbonate resin (SP value: 10.2 ( MPa) 1/2 ) and an acrylic resin (SP value: 9.5 (MPa) 1/2 ).
  • the resin having a low SP value is not limited to the above-mentioned resins, and any resin other than TAC (SP value; 10.9 (MPa) 1/2 ) can be used.
  • a mixed solvent of a good solvent and a poor solvent can be used.
  • a good solvent refers to an organic solvent having a property of dissolving a resin (solubility), such as 1,3-dioxolan, THF (tetrahydrofuran), methyl ethyl ketone, acetone, methyl acetate, methylene chloride (dichloromethane, methylene chloride), Toluene and the like correspond to this.
  • a poor solvent refers to a solvent that does not have the property of dissolving a resin by itself, such as methanol or ethanol.
  • Conditional expression (1) defines the magnitude relationship between the temperatures of the respective dopes immediately after leaving the melting vessel 21, immediately after leaving the intermediate vessel 22, and immediately before entering the casting die 2.
  • Conditional expression (2) defines an appropriate range of the temperature difference between the dope immediately after leaving the melting vessel 21 and the dope immediately before entering the casting die 2.
  • Conditional expression (3) defines an appropriate range of the temperature difference between the dope immediately after leaving the intermediate pot 22 and the dope immediately before entering the casting die 2.
  • conditional expression (1) the dope immediately before entering the casting die 2 is cooled more than the dope immediately after leaving the melting pot 21 and the dope immediately after leaving the intermediate pot 22. .
  • the low-viscosity dope containing the resin having a low SP value is cooled in the process of being transferred from the melting vessel 21 to the casting die 2, thereby generating a high-viscosity region in a part of the dope. it can.
  • conditional expression (2) the degree of cooling of the dope is limited (because the dope is not cooled too much), so that it is possible to suppress the generation of a region having a high viscosity in the dope. it can.
  • T2-T3 temperature difference
  • T2-T3 temperature difference
  • a low-viscosity dope containing a resin having a low SP value is easily affected by the surrounding wind and temperature during casting from the casting die 2 and transporting on the support 3.
  • the surface of No. 5 is easily deformed and the thickness deviation and the phase difference deviation are likely to occur.
  • By generating a high-viscosity region in the dope as in the present embodiment it is possible to prevent the surface of the web 5 from being deformed by the influence of wind or the like at the time of casting and transporting the dope onto the support 3. Can be. Thereby, it is possible to reduce the occurrence of the film thickness deviation and the phase difference deviation due to the influence of the wind at the time of the casting.
  • the dope is excessively cooled and a region having a high viscosity is generated in the dope, a gel-like substance is easily generated in the dope. Further, the surface of the dope is likely to have irregularities immediately after being discharged from the casting die 2 on the support 3, and the surface of the dope is less likely to be leveled (flattened) by the influence of stress due to uneven drying. In this case, the surface deformation of the dope remains as the surface deformation of the web 5 after drying. For this reason, due to the surface deformation of the web 5, a thickness deviation and a phase difference deviation occur in the optical film F finally obtained.
  • the high-viscosity region and the low-viscosity region can coexist in the dope while suppressing the increase in the high-viscosity region due to excessive cooling.
  • the low-viscosity region of the dope flows, and the stress due to uneven drying is transmitted to the periphery by the low-viscosity region. Is leveled.
  • the surface deformation of the web 5 can be suppressed, it is possible to reduce the occurrence of the thickness deviation and the phase difference deviation in the optical film F finally obtained due to the surface deformation.
  • the presence of a low-viscosity region in the dope also suppresses the generation of a gel-like substance.
  • conditional expression (4) 5 ° C ⁇ Tmax-Tmin ⁇ 30 ° C
  • Tmax the maximum temperature of the dope between the intermediate pot 22 and the casting die 2 (° C.)
  • Tmin minimum temperature (° C.) of dope between the intermediate pot 22 and the casting die 2 It is.
  • the temperature change of the dope that satisfies the conditional expression (4) can be realized by heating or cooling the dope flowing in the conduit 24 by at least one heat exchanger 25 as described above.
  • FIG. 3 shows the temperature history of the dope flowing between the intermediate pot 22 and the casting die 2 (temperature at each dope passage position).
  • the position of the passing point 0 on the horizontal axis corresponds to the position of the intermediate shuttle 22, and the position of the passing point 6 corresponds to the position of the casting die 2.
  • conditional expression (4) various temperature histories can be realized between the intermediate pot 22 and the casting die 2. For example, even if the temperature of the dope coming out of the intermediate kettle 22 is constant (same) and the temperature of the dope entering the casting die 2 is constant (same), the temperature of the dope is cast from the intermediate kettle 22 as the temperature history of the dope.
  • Ta, Tb, and Tc in the figure correspond to the difference between the maximum temperature Tmax and the minimum temperature Tmin of the dope in each case (temperature history).
  • the low-viscosity region and the high-viscosity region in the dope are well-balanced. Mix. Thereby, the effect of leveling the entire surface of the dope (web 5) by movement of the region with high fluidity and low viscosity can be enhanced, and at least the film thickness deviation can be further reduced.
  • conditional expression (4a) when a dope in which a cycloolefin-based resin is dissolved in a solvent is used, it is preferable that the following conditional expression (4a) is satisfied. That is, (4a) 10 ° C. ⁇ Tmax ⁇ Tmin ⁇ 15 ° C. It is. In the solution casting using a cycloolefin-based resin, by further satisfying the conditional expression (4a), both the film thickness deviation and the phase difference deviation are surely reduced by the leveling effect of the web surface by the low viscosity region. It becomes possible.
  • An optical film 1 made of a cycloolefin-based resin film (COP film) was produced by the following production method (solution casting method).
  • Thermoplastic resin Cycloolefin resin (G7810, manufactured by JSR Corporation) 145 parts by mass Fine particles: Silicon dioxide dispersion diluent 25 parts by mass Dichloromethane 360 parts by mass Ethanol 12 parts by mass
  • Thermoplastic resin Cycloolefin resin (G7810, manufactured by JSR Corporation) 145 parts by mass
  • Fine particles Silicon dioxide dispersion diluent 25 parts by mass Dichloromethane 360 parts by mass Ethanol 12 parts by mass
  • the above is charged into a closed container, heated and stirred. While completely dissolved, and Azumi Filter Paper No. The resulting solution was filtered using No. 24 to prepare a dope.
  • the dope prepared above was transferred from the melting pot to the casting die via the intermediate pot.
  • the temperature of the dope immediately after leaving the melting pot is T1 (° C.)
  • the temperature of the dope immediately after leaving the intermediate pot is T2 (° C.)
  • the temperature of the dope immediately before entering the casting die is T3 ( ° C)
  • each temperature of T1, T2, and T3 was adjusted to the temperature shown in Table 1, respectively.
  • T1 was set to a temperature equal to or higher than the boiling point (about 39.5 ° C.) of the solvent (here, dichloromethane).
  • Tmax and Tmin (° C.) When the maximum temperature and the minimum temperature of the dope between the intermediate pot and the casting die are Tmax (° C.) and Tmin (° C.), respectively, at least one dope is provided between the intermediate pot and the casting die.
  • a heat exchanger was provided, and Tmax and Tmin were adjusted to have the values shown in Table 1.
  • T1 the temperature was adjusted by flowing hot or cold water through a jacket provided outside the melting pot.
  • T2 the temperature was adjusted by flowing hot or cold water through a jacket provided outside the intermediate pot.
  • T3 the temperature was adjusted by a heat exchanger between the melting pot and the intermediate pot (by flowing a heating medium or a cooling medium outside the pipe).
  • each temperature of T1, T2, T3, Tmax, and Tmin was measured as follows using a thermometer (RTD made by Okazaki Seisakusho; Model No. RBN).
  • T1 the above-mentioned thermometer was set in the melting vessel, and the dope temperature was measured in a state where the thermometer was completely immersed in the dope. The obtained result was defined as T1.
  • T2 in the pipe through which the dope that has exited the intermediate kettle passes, the above-mentioned thermometer is installed in the pipe from the joint between the outlet of the intermediate kettle and the pipe to a position 1 m in the dope advancing direction to adjust the dope temperature. The measurement was performed, and the obtained result was defined as T2.
  • thermometer was installed in a pipe just before entering the casting die, in a pipe 1 m away from the joint between the pipe and the casting die in a direction opposite to the dope advancing direction. The temperature was measured, and the obtained result was defined as T3.
  • Tmax and Tmin dope by installing a thermometer every 50 cm between the thermometer for T2 measurement and the thermometer for T3 measurement in the pipe between the intermediate pot and the casting die. The temperature was measured, and the maximum temperature was measured as Tmax and the minimum temperature was measured as Tmin among the plurality of measured temperatures.
  • the dope is uniformly cast on the stainless steel band support from the casting die, and the web is formed on the stainless steel band support by evaporating the solvent until the residual solvent amount becomes 80% by mass.
  • the web was peeled off from the body.
  • the obtained web was kept at 35 ° C to further evaporate the solvent, slit to a width of 1.15 m, and dried at a drying temperature of 160 ° C.
  • the film was dried for 15 minutes while being conveyed by a number of rollers in a drying apparatus at 130 ° C., slit to a width of 1.0 m, and wound around a core to obtain an optical film 1.
  • the thickness of the optical film 1 was 40 ⁇ m, and the winding length was 5000 m.
  • the film thickness in the width direction was measured using a digimatic thickness gauge (manufactured by Mitutoyo). The measurement of the film thickness was performed on the obtained film having a width of 1.0 m from the left end to the right end at intervals of 100 mm along the width direction, and the thickness was varied (the maximum value of the film thickness in the width direction). (Difference between the minimum value and the minimum value). This measurement was performed three times every 50 m in the longitudinal direction, and the average value was obtained. Then, the thickness variation (film thickness deviation) was evaluated based on the following evaluation criteria.
  • Thickness variation is less than 1 ⁇ m (very good). 4: Thickness variation is 1 ⁇ m or more and less than 2 ⁇ m (very good). 3: The thickness variation is 2 ⁇ m or more and less than 3 ⁇ m (good). 2: The thickness variation is 3 ⁇ m or more and less than 5 ⁇ m (defective). 1: Thickness variation is 5 ⁇ m or more (very poor).
  • the measurement of Ro is performed on the obtained film having a width of 1.0 m from the left end to the right end at intervals of 100 mm along the width direction, and the variation of Ro (the maximum value of Ro in the width direction) is measured. (Difference between the minimum value and the minimum value). This measurement was performed three times every 50 m in the longitudinal direction, and the average value was obtained. Then, the variation (phase difference deviation) of Ro was evaluated based on the following evaluation criteria. It is preferable that the variation of Ro is smaller. "Evaluation criteria" 5: The variation in Ro is less than 1 nm (very good). 4: The variation in Ro is 1 nm or more and less than 2 nm (very good). 3: Ro variation is 2 nm or more and less than 3 nm (good). 2: The variation in Ro is 3 nm or more and less than 5 nm (poor). 1: Ro variation is 5 nm or more (very bad).
  • Table 1 shows the evaluation results of the optical films 1 to 16 of Examples 1 to 16 and the optical films 21 to 26 of Comparative Examples 1 to 6.
  • PC indicates a polycarbonate resin
  • Acryl indicates an acrylic resin
  • TAC indicates triacetyl cellulose.
  • Comparative Examples 1 to 6 all have poor film thickness variation (film thickness deviation) and Ro variation (phase difference deviation).
  • the solvent evaporates in the intermediate vessel, and the concentration of the liquid dope fluctuates. Therefore, film formation is performed using a dope that is out of design, so that the film thickness varies greatly, which is considered to cause a film thickness deviation and a phase difference deviation.
  • T3> T2 in the dope transfer step, T3> T2, and the dope entering the casting die could not be sufficiently cooled, so that a high-viscosity region could not be sufficiently generated in the dope.
  • the cause is that the surface of the dope fluctuates under the influence of the surrounding wind or the like immediately after casting on the support.
  • T2 ⁇ T3 5 ° C.
  • the temperature difference between T2 and T3 was too small to sufficiently cool the dope entering the casting die. It is considered that a high-viscosity region cannot be sufficiently generated therein, and the surface of the dope fluctuates immediately after casting on the support under the influence of the surrounding wind or the like.
  • T2-T3 is 15 ° C
  • T1-T3 is 26 ° C
  • the dope entering the casting die is cooled too much.
  • a region of high viscosity is generated in the dope too much, and the surface of the dope is likely to have irregularities immediately after casting on the support, and the surface deformation of the dope remains as the surface deformation of the web after drying, and this is It is considered that a film thickness deviation and a phase difference deviation are caused in the final film.
  • Comparative Example 6 a film was formed using TAC.
  • TAC high-viscosity resin
  • Example 1 to 15 the film thickness deviation and the phase difference deviation are further reduced as compared with Example 16.
  • the following conditional expression (4) (4) 5 ° C ⁇ Tmax-Tmin ⁇ 30 ° C
  • the dope temperature is raised or lowered between the intermediate pot and the casting die, so that the low-viscosity region and the high-viscosity region are mixed in the dope in a well-balanced manner. It is considered that the leveling effect of the surface of the dope (web) by the region of the viscosity was enhanced.
  • a method for producing an optical film by producing an optical film by a solution casting method A dope is prepared by dissolving a resin having an SP value of 10.5 (MPa) 1/2 or less as a solubility parameter in a solvent in a dissolving vessel to prepare a dope, and transferring the dope to a casting die via an intermediate vessel.
  • a transfer process A casting step of casting the dope from the casting die onto a support, A method for producing an optical film, wherein the dope transfer step satisfies the following conditional expressions (1) to (3); (1) T1>T2> T3 (2) T1-T3 ⁇ 25 ° C.
  • T1 Temperature (° C.) of the dope immediately after leaving the melting pot
  • T2 temperature of the dope immediately after leaving the intermediate pot (° C.)
  • T3 temperature of the dope immediately before entering the casting die (° C.) It is.
  • the resin is a cycloolefin resin, 3.
  • the method for producing an optical film of the present invention can be used when an optical film is produced by a solution casting method using a resin having a low SP value.

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  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
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  • Ophthalmology & Optometry (AREA)
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Abstract

L'invention concerne un procédé destiné à la production d'un film optique, qui est destiné à la production d'un film optique par un procédé de formation de film de coulée en solution, le procédé comprenant : une étape de transport de dopant, dans laquelle une résine dotée d'une valeur SP en tant que paramètre de solubilité de 10,5 (MPa)1/2 ou moins est dissoute dans un solvant dans une cuve de dissolution en vue de préparer un dopant, et le dopant est transporté vers une matrice de coulée au moyen d'une cuve intermédiaire ; et une étape de coulée, dans laquelle le dopant est coulé sur un corps de support à partir de la matrice de coulée. Dans l'étape de transport de dopant, les formules conditionnelles suivantes (1) – (3) sont satisfaites. (1) T1 > T2 > T3, (2) T1− T3 ≤ 25 °C, et (3) 5°C < T2 − T3 < 15°C, où T1 est la température (°C) du dopant immédiatement après sa sortie de la cuve de dissolution, T2 est la température (°C) du dopant immédiatement après sa sortie de la cuve intermédiaire, et T3 est la température (°C) du dopant immédiatement avant son entrée dans la matrice de coulée.
PCT/JP2019/014767 2018-07-11 2019-04-03 Procédé de production d'un film optique WO2020012732A1 (fr)

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JP2017121764A (ja) * 2016-01-08 2017-07-13 コニカミノルタ株式会社 光学フィルムの製造方法

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JP4753553B2 (ja) 2004-08-05 2011-08-24 富士フイルム株式会社 移送方法及び溶液製膜方法
JP4585947B2 (ja) 2005-09-09 2010-11-24 富士フイルム株式会社 環状ポリオレフィンフィルムの製造方法
KR20080109756A (ko) * 2006-03-15 2008-12-17 후지필름 가부시키가이샤 용액 캐스팅 방법 및 필름 제조를 위한 용액 캐스팅 장치
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WO2009038096A1 (fr) * 2007-09-21 2009-03-26 Sumitomo Chemical Company, Limited Procédé de production d'un film optique en résine thermoplastique
JP6355658B2 (ja) * 2015-02-03 2018-07-11 富士フイルム株式会社 溶液製膜方法及び装置
CN105835376B (zh) * 2015-02-03 2019-11-01 富士胶片株式会社 溶液制膜方法及装置
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JP2017121764A (ja) * 2016-01-08 2017-07-13 コニカミノルタ株式会社 光学フィルムの製造方法

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