WO2021192463A1 - 位相差フィルムの製造方法 - Google Patents

位相差フィルムの製造方法 Download PDF

Info

Publication number
WO2021192463A1
WO2021192463A1 PCT/JP2020/047860 JP2020047860W WO2021192463A1 WO 2021192463 A1 WO2021192463 A1 WO 2021192463A1 JP 2020047860 W JP2020047860 W JP 2020047860W WO 2021192463 A1 WO2021192463 A1 WO 2021192463A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
clip
pitch
retardation
temperature
Prior art date
Application number
PCT/JP2020/047860
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
歩夢 中原
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN202080098268.7A priority Critical patent/CN115280195A/zh
Priority to KR1020227026289A priority patent/KR20220122728A/ko
Publication of WO2021192463A1 publication Critical patent/WO2021192463A1/ja

Links

Images

Classifications

    • 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
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0003—Discharging moulded articles from the mould
    • 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
    • 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
    • B29C55/20—Edge clamps
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • 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
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C2037/90—Measuring, controlling or regulating
    • 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
    • B29D11/00634—Production of filters
    • B29D11/00644—Production of filters polarizing
    • 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
    • B29D11/0073—Optical laminates
    • 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
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material

Definitions

  • the present invention relates to a method for producing a retardation film.
  • circular polarizing plates are used for the purpose of improving display characteristics and preventing reflection.
  • a circular polarizing plate typically, a polarizer and a retardation film (typically a ⁇ / 4 plate) form an angle of 45 ° between the absorption axis of the polarizer and the slow axis of the retardation film. It is laminated in this way.
  • retardation films are typically produced by uniaxial or biaxial stretching in the longitudinal and / or lateral directions, so that the slow axis is often a long film. It appears in the horizontal direction (width direction) or the vertical direction (long direction) of the original film.
  • the clip pitch in the vertical direction is set at each of the left and right edges in the width direction of the long film.
  • the retardation film is gripped by changing variable pitch type left and right clips, and by changing the clip pitch of at least one of the left and right clips and stretching in an oblique direction (hereinafter, also referred to as "diagonal stretching").
  • a technique for expressing the slow axis in an oblique direction has been proposed (for example, Patent Document 1).
  • the present invention has been made to solve the above problems, and a main object thereof is to use a resin film having a large birefringence ⁇ n to obtain a diagonally stretched retardation film having a small variation in in-plane retardation in the width direction.
  • the purpose is to provide a method that can be manufactured without defects.
  • the clip pitch in the vertical direction changes at the left and right ends in the width direction of a long film having a double refraction ⁇ n of 0.025 or less in an unstretched state.
  • Gripping by the left and right clips of the variable pitch type; moving the left and right clips while changing at least one clip pitch to stretch the film diagonally; heating the film to a predetermined temperature. Includes fixing the stretched state; and releasing the film from the left and right clips.
  • the temperature difference between the left side and the right side when fixing the stretched state is 7 ° C. or more, and the diagonal stretching includes correcting the slack of the film.
  • the lower of the left side temperature and the right side temperature when fixing the stretched state is Tg-20 ° C. or higher, where Tg is the glass transition temperature of the long film. be.
  • the birefringence ⁇ n of the film in the unstretched state is 0.008 or more.
  • the elongated film contains a polycarbonate-based resin, and the polycarbonate-based resin contains a structural unit represented by the following formula (V):
  • the manufacturing method comprises correcting the slack of the film in the oblique stretching of the elongated film, the correction of the slack after fixing the stretched state of the film.
  • the thickness of the retardation film obtained by the above manufacturing method is 15 ⁇ m to 45 ⁇ m
  • the in-plane retardation Re (550) is 100 nm to 200 nm
  • the slow axis direction and the long direction are used.
  • the angle formed is 40 ° to 50 ° or 130 ° to 140 °
  • the variation of the in-plane phase difference Re (550) in the width direction is 6% with respect to the average value of the in-plane phase difference Re (550) in the width direction.
  • the temperature difference between the left side and the right side when fixing the stretched state.
  • a diagonally stretched retardation film having a small variation in the in-plane retardation in the width direction can be manufactured without any trouble such as breakage.
  • FIG. 5 is a schematic plan view illustrating an overall configuration of an example of a stretching apparatus that can be used in the method for producing a retardation film according to an embodiment of the present invention.
  • FIG. 5 is a schematic plan view of a main part for explaining a link mechanism for changing a clip pitch in the stretching device of FIG.
  • FIG. 5 is a schematic plan view of a main part for explaining a link mechanism for changing a clip pitch in the stretching device of FIG.
  • It is a schematic diagram explaining the method of measuring the amount of slack.
  • It is the schematic which shows the profile of the clip pitch in the manufacturing method of the retardation film by one Embodiment of this invention.
  • It is the schematic which shows the profile of the clip pitch in the manufacturing method of the retardation film by another embodiment of this invention.
  • the clip pitch in the vertical direction means the distance between the centers in the traveling direction of the clip which is adjacent in the vertical direction.
  • the left-right relationship in the width direction of the long film means the left-right relationship in the transport direction of the film unless otherwise specified.
  • the method for manufacturing a retardation film according to the embodiment of the present invention is a variable pitch type left and right clip in which the clip pitch in the vertical direction changes at the left and right ends of the long film in the width direction.
  • the film is stretched diagonally by moving the left and right clips while changing the pitch of at least one of the clips; the film is heated to a predetermined temperature to fix the stretched state (heat fixation). To do; and to release the film from the left and right clips;
  • the film gripped by the clip is preheated and then subjected to oblique stretching.
  • the manufacturing method typically includes correcting slack in the film during diagonal stretching.
  • the film is transported by rolls, and the amount of slack in the film and the portion where the slack occurs are detected between the transport rolls; and based on the detection result, the slack is corrected. Includes making corrections that change the clip pitch of at least one of the left and right clips upstream of the transport line.
  • a resin film having a birefringence ⁇ n of 0.025 or less in the unstretched state is used as the long film (film to be stretched).
  • the temperature difference between the left side and the right side in heat fixing (specifically, the temperature difference between the left side heat fixing zone and the right side heat fixing zone) is 7 ° C. or more.
  • the birefringence ⁇ n is obtained from the formula: nx ⁇ ny.
  • nx is the refractive index in the direction in which the in-plane refractive index is maximized (that is, the slow-phase axis direction)
  • ny is the in-plane direction orthogonal to the slow-phase axis (that is, the phase-advancing axis direction). Refractive index.
  • FIG. 1 is a schematic view illustrating a method for manufacturing a retardation film according to one embodiment of the present invention.
  • the diagonally stretched film 1 that has been diagonally stretched in the stretching device 100 and then released from the clip is sent out from the outlet of the stretching device 100 and is rolled and transported using the transport rolls 200a, 200b, 200c and 200d to take up the winding unit 300. It is wound up with.
  • the film 1 is transported by roll, the amount of slack or the like is detected between the transport rolls, and based on the detection result, correction is performed to change the clip pitch of at least one of the left and right clips upstream of the transport line.
  • the difference in length between the left and right ends of the stretched film obtained after the correction is reduced, and as a result, a long diagonally stretched film with reduced slack can be obtained.
  • Gripping, preheating, diagonally stretching, heat-fixing, and releasing from the clip by the clip can be performed by, for example, holding the left and right ends of the long film in the width direction while traveling and moving at different speeds. It can be done using a tenter type simultaneous biaxial stretching device equipped with a clip of.
  • FIG. 2 is a schematic plan view illustrating an overall configuration of an example of a stretching apparatus that can be used in the method for producing a retardation film according to an embodiment of the present invention.
  • the stretching device 100 has an endless loop 10L and an endless loop 10R having a large number of clips 20 for gripping the film symmetrically on the left and right sides in a plan view.
  • the endless loop on the left side when viewed from the inlet side of the film is referred to as the endless loop 10L on the left side
  • the endless loop on the right side is referred to as the endless loop 10R on the right side.
  • the clips 20 of the left and right endless loops 10L and 10R are guided by the reference rail 70 and circulate in a loop shape, respectively.
  • the clip 20 of the endless loop 10L on the left side circulates in the counterclockwise direction, and the clip 20 of the endless loop 10R on the right side circulates in the clockwise direction.
  • a gripping zone A, a preheating zone B, a stretching zone C, and a heat fixing and opening zone D are provided in this order from the inlet side to the outlet side of the seat.
  • Each of these zones means a zone in which the film to be stretched is substantially gripped, preheated, diagonally stretched, and heat-fixed and released, not a mechanically and structurally independent compartment. No. Also note that the length ratio of each zone in the stretching device of FIG. 2 is different from the actual length ratio.
  • a zone for performing arbitrary appropriate treatment may be provided between the stretching zone C and the heat-fixing and opening zone D, if necessary.
  • a treatment include a lateral shrinkage treatment and the like.
  • the stretching device is typically a heating device (for example, a hot air type, a near infrared type) for setting a heating environment from the preheating zone B to the heat fixing and opening zone D. , Far-infrared type ovens).
  • the left and right endless loops 10L and 10R are configured to be substantially parallel to each other at a separation distance corresponding to the initial width of the film to be stretched.
  • the stretching zone C the separation distances of the left and right endless loops 10L and 10R gradually increase from the side of the preheating zone B toward the heat fixing and opening zone D until they correspond to the width of the film after stretching.
  • the left and right endless loops 10L and 10R are configured to be substantially parallel to each other at a separation distance corresponding to the stretched width of the film.
  • the configurations of the left and right endless loops 10L and 10R are not limited to the above illustrated example.
  • the left and right endless loops 10L and 10R may be configured to be substantially parallel to each other at a separation distance corresponding to the initial width of the film to be stretched from the gripping zone A to the heat-fixing and opening zones D.
  • the clip of the endless loop 10L on the left side (clip on the left side) 20 and the clip of the endless loop 10R on the right side (clip on the right side) 20 can move independently.
  • the drive sprockets 11 and 12 of the endless loop 10L on the left side are rotationally driven in the counterclockwise direction by the electric motors 13 and 14, and the drive sprockets 11 and 12 of the endless loop 10R on the right side are clocked by the electric motors 13 and 14. It is driven to rotate in the clockwise direction.
  • a running force is applied to the clip-carrying members of the drive rollers (not shown) engaged with the drive sprockets 11 and 12.
  • the endless loop 10L on the left side circulates in the counterclockwise direction
  • the endless loop 10R on the right side circulates in the clockwise direction.
  • the clip (clip on the left side) of the endless loop 10L on the left side and the clip (clip on the right side) 20 of the endless loop 10R on the right side are each of a variable pitch type. That is, the left and right clips 20 and 20 can independently change the clip pitch in the vertical direction as they move.
  • the variable pitch type configuration can be realized by adopting a drive system such as a pantograph system, a linear motor system, or a motor chain system.
  • the link mechanism (pantograph mechanism) will be described as an example.
  • FIG. 3 and 4 are schematic plan views of a main part for explaining a link mechanism for changing the clip pitch in the stretching device of FIG. 2, FIG. 3 shows a state where the clip pitch is the minimum, and FIG. 4 shows a clip. Indicates the maximum pitch.
  • a clip supporting member 30 having an elongated rectangular shape in the horizontal direction in a plan view is provided to individually support the clips 20.
  • the clip-carrying member 30 is formed into a frame structure having a strong closed cross section by an upper beam, a lower beam, a front wall (a wall on the clip side), and a rear wall (a wall on the opposite side of the clip).
  • the clip-carrying member 30 is provided so as to roll on the traveling road surfaces 81 and 82 by the traveling wheels 38 at both ends thereof.
  • the traveling wheel on the front wall side (the traveling wheel rolling on the traveling road surface 81) is not shown.
  • the traveling road surfaces 81 and 82 are parallel to the reference rail 70 over the entire area.
  • elongated holes 31 are formed along the longitudinal direction of the clip-supporting member, and the slider 32 is long. It is slidably engaged in the longitudinal direction of the hole 31.
  • a single first shaft member 33 is vertically provided in the vicinity of the clip 20 side end portion of the clip supporting member 30 so as to penetrate the upper beam and the lower beam.
  • the slider 32 of the clip-carrying member 30 is provided with a second shaft member 34 vertically penetrating.
  • One end of the main link member 35 is pivotally connected to the first shaft member 33 of each clip-carrying member 30.
  • the other end of the main link member 35 is pivotally connected to the second shaft member 34 of the adjacent clip-carrying member 30.
  • one end of the sub-link member 36 is pivotally connected to the first shaft member 33 of each clip-carrying member 30.
  • the other end of the sub-link member 36 is pivotally connected to the intermediate portion of the main link member 35 by a pivot 37. As shown in FIG.
  • the pitch in the direction becomes smaller, and as shown in FIG. 4, the more the slider 32 moves to the front side (clip side) of the clip-carrying member 30, the more the clip-carrying members 30 are in the vertical direction.
  • the pitch increases.
  • the slider 32 is positioned by the pitch setting rail 90. As shown in FIGS. 3 and 4, the smaller the distance between the reference rail 70 and the pitch setting rail 90, the larger the clip pitch.
  • a diagonally stretched retardation film (typically, a retardation film having a slow axis in the oblique direction with respect to the elongated direction) is produced. obtain.
  • Specific embodiments of the stretching apparatus as described above are described in, for example, Japanese Patent Application Laid-Open No. 2008-44339, and the whole thereof is incorporated herein by reference. Hereinafter, each step will be described in detail.
  • the clips 20 of the left and right endless loops 10L and 10R have a constant clip pitch or a constant clip pitch in which both edges of the film to be stretched are equal to each other. , Are gripped at different clip pitches.
  • the film is sent to the preheating zone B by the movement of the clips 20 of the left and right endless loops 10L and 10R (substantially, the movement of each clip supporting member guided by the reference rail 30).
  • the left and right endless loops 10L and 10R are basically configured to be substantially parallel to each other at a separation distance corresponding to the initial width of the film to be stretched as described above.
  • the film is heated without stretching or longitudinal stretching.
  • the distance between the left and right clips may be slightly increased in order to avoid problems such as the film bending due to preheating and contact with the nozzle in the oven.
  • the film is heated to a temperature of T1 (° C.).
  • the temperature T1 is preferably equal to or higher than the glass transition temperature (Tg) of the film, more preferably Tg + 2 ° C. or higher, and further preferably Tg + 5 ° C. or higher.
  • the heating temperature T1 is preferably Tg + 40 ° C. or lower, more preferably Tg + 30 ° C. or lower.
  • the temperature T1 is, for example, 70 ° C. to 190 ° C., preferably 80 ° C. to 180 ° C.
  • the temperature raising time up to the temperature T1 and the holding time at the temperature T1 can be appropriately set according to the constituent materials of the film and the manufacturing conditions (for example, the transport speed of the film). These temperature raising time and holding time can be controlled by adjusting the moving speed of the clip 20, the length of the preheating zone, the temperature of the preheating zone, and the like.
  • the left and right clips 20 are run and moved while changing the clip pitch in at least one of them in the vertical direction to diagonally stretch the film. More specifically, by increasing or decreasing the clip pitches of the left and right clips at different positions, or by changing (increasing and / or decreasing) the clip pitches of the left and right clips at different speeds of change, etc. The film is stretched diagonally.
  • Diagonal stretching may include lateral stretching.
  • the oblique stretching can be performed while increasing the distance between the left and right clips (distance in the width direction), for example, as shown in the illustrated example.
  • it can be performed while maintaining the distance between the left and right clips.
  • the ratio of the lateral (TD) stretching ratio (the ratio of the width W final of the film after diagonal stretching to the initial width W initial of the film (W final / W initial ) is preferably 1.05. It is about 6.00, more preferably 1.10 to 5.00.
  • the oblique stretching differs in the longitudinal direction from the position where the clip pitch of one of the left and right clips starts to increase or decrease and the position where the clip pitch of the other clip starts to increase or decrease. This can be done by increasing or decreasing the clip pitch of each clip to a predetermined pitch while in position.
  • the description of Patent Document 1 Japanese Patent Application Laid-Open No. 2014-238524, etc. can be referred to.
  • oblique stretching increases or decreases the clip pitch of the other clip to a predetermined pitch while keeping the clip pitch of one of the left and right clips fixed, and then increases or decreases the original clip pitch. Can be done by returning to.
  • the description of JP2013-543338A, JP2014-194482A, and the like can be referred to.
  • oblique stretching reduces the clip pitch of one of the left and right clips while increasing the clip pitch of the other clip, and (ii) the decrease. This can be done by changing the clip pitch of each clip so that the resulting clip pitch and the increased clip pitch have a predetermined equal pitch.
  • the oblique stretching of the embodiment is to diagonally stretch the film by increasing the clip pitch of one clip and decreasing the clip pitch of the other clip while increasing the distance between the left and right clips (the first).
  • the clip pitch of one clip is maintained or reduced so that the clip pitches of the left and right clips are equal, and the clip pitch of the other clip is maintained or reduced.
  • Increasing the clip pitch of the clip may include diagonally stretching the film (second diagonal stretching step).
  • the temperature T2 is preferably Tg-20 ° C. to Tg + 30 ° C., more preferably Tg-10 ° C. to Tg + 20 ° C., and particularly preferably about Tg, with respect to the glass transition temperature (Tg) of the film to be stretched.
  • Tg glass transition temperature
  • the temperature T2 is, for example, 70 ° C. to 180 ° C., preferably 80 ° C. to 170 ° C.
  • the difference (T1-T2) between the temperature T1 and the temperature T2 is preferably ⁇ 2 ° C. or higher, more preferably ⁇ 5 ° C. or higher. In one embodiment, T1> T2, so the film heated to temperature T1 in the preheating zone can be cooled to temperature T2.
  • the lateral shrinkage treatment is performed after diagonal stretching.
  • paragraphs 0029 to 0032 of JP2014-194483A can be referred to.
  • the film is heat-treated to fix the stretched state (heat fixing).
  • heat fixing heat-fixing
  • the clip pitch in the vertical direction may be reduced, thereby relieving stress.
  • Thermal fixation can typically be done at temperature T3.
  • the temperature T3 depends on the film to be stretched, and may be T2 ⁇ T3 or T2 ⁇ T3.
  • T2 ⁇ T3 when the film is an amorphous material, T2 ⁇ T3, and when the film is a crystalline material, the crystallization treatment may be performed by setting T2 ⁇ T3.
  • T2 ⁇ T3 the difference between the temperatures T2 and T3 (T2-T3) is preferably 0 ° C. to 50 ° C.
  • the heat treatment (heat fixing) time is typically 10 seconds to 10 minutes.
  • the temperature difference between the left side and the right side in heat fixing (specifically, the temperature difference between the left side heat fixing zone and the right side heat fixing zone) is 7 ° C. or more as described above. It is preferably 10 ° C. or higher. On the other hand, the temperature difference is preferably 25 ° C. or lower, more preferably 22 ° C. or lower.
  • the high temperature side may be on the left side or on the right side.
  • the temperature of the heat fixing zone on the left side and the temperature of the heat fixing zone on the right side refer to the set temperature of the heating device for setting the zone as a heating environment, respectively.
  • the lower of the left side temperature and the right side temperature in heat fixation is preferably Tg-20 ° C. or higher, more preferably Tg-20 ° C. to Tg + 30 ° C., and even more preferably Tg-10 ° C. to Tg + 20 ° C. Yes, particularly preferably about Tg. If the temperature is in such a range, there is an advantage that the film does not loosen significantly.
  • the film may be cooled to Tg or less, if necessary.
  • the film is released from the clip at any position in the thermal fixation and opening zone D.
  • the film In the heat-fixed and open zone D, neither lateral stretching nor longitudinal stretching is usually performed.
  • the stretched film released from the clip is sent out from the outlet of the stretching device and is used for roll transport described later.
  • the film may be blown in the second half of the heat-fixed and open zone D and before the release of the clip.
  • the wind speed at the time of applying the wind is preferably 15 m / sec to 35 m / sec, and more preferably 20 m / sec to 30 m / sec.
  • the wind is preferably warm air.
  • the temperature of the wind can correspond to, for example, a heat-fixed temperature. More specifically, the temperature of the wind on the left can be the same as the heat-fixed temperature on the left, and the temperature of the wind on the right can be the same as the heat-fixed temperature on the right.
  • the blowing can be performed, for example, by ejecting wind at a set temperature and a set wind speed from the nozzles above and / or below.
  • Roll transfer In roll transfer, the amount of slack in the stretched film between the transfer rolls and the portion where the slack occurs are detected.
  • the amount of slack and the portion where the slack occurs are detected. More accurate detection results can be obtained by detecting the amount of slack and the portion where the slack is occurring with both ends removed.
  • the width of the end to be cut and removed can be independently, for example, 20 mm to 600 mm, preferably 100 mm to 500 mm. Cutting and removal of the end portion can be performed by ordinary slit processing.
  • the amount of slack and the portion where the slack is generated can be detected by detecting the difference between the original running position of the film and the actual running position of the film during roll transfer.
  • the detection can be performed by detecting a difference in position (transport height) in the width direction of the film at an intermediate point between the transport rolls.
  • FIG. 5 is a schematic view illustrating an example of a method of detecting a slack amount and a portion where slack is occurring.
  • the ultrasonic displacement sensor 400 is arranged below the central portion and the left and right end portions in the width direction of the stretched film 1 to obtain ultrasonic waves.
  • the distance from the displacement sensor 400 to the stretched film 1 can be measured, and the difference (L MAX- L MIN ) between the maximum distance (L MAX ) and the minimum distance (L MIN ) can be used as the amount of slack.
  • the part given the minimum distance is detected as the part where slack occurs.
  • the cause of the slack in the diagonally stretched film is that the stretching processes (timing, number of times, order, heat history, etc.) of the left and right ends of the film are different from each other during diagonal stretching, and as a result, both ends after the clip is opened. Since the amount of deformation of the film may be non-uniform, the site where the slack occurs is usually one of the ends. Therefore, the slack can be detected only at the left and right ends of the stretched film 1 in the width direction. In this case, a film without slack is conveyed in advance, the distance (L 0 ) from the ultrasonic displacement sensor to the film is measured and placed, and the difference between the distance between the left and right ends and the ultrasonic displacement sensor and L 0.
  • the slack can be obtained by determining the film passing speed of the normal part and the slack part by using an appropriate detection means (for example, a laser Doppler velocimeter). It can be detected using (calculating the difference in length, etc.).
  • an appropriate detection means for example, a laser Doppler velocimeter. It can be detected using (calculating the difference in length, etc.).
  • the distance (D) between the transport rolls at the time of the above detection is not particularly limited, but can be, for example, 500 mm to 2000 mm, preferably 700 mm to 1500 mm.
  • the film tension at the time of the above detection is not particularly limited, but can be, for example, 50 N / m to 400 N / m, preferably 100 N / m to 200 N / m. If the transport tension is too high, the film being transported may be elastically deformed, making it difficult to detect slack. On the other hand, if the transport tension is too low, the tension itself may not be stable and the measured value of slack may not be stable.
  • the roll transfer can be performed in a non-heated environment.
  • the atmospheric temperature during roll transfer may be, for example, about 15 ° C. to 40 ° C., or for example, about 20 ° C. to 30 ° C.
  • correction to change the clip pitch is so-called feedback correction, and is upstream of the transport line so as to reduce the amount of slack based on the detection result of the amount of slack and the portion where the slack is occurring. This is done by changing the clip pitch of at least one of the left and right clips. For example, if the detected amount of slack is greater than or equal to a predetermined value, a correction for changing the clip pitch can be performed, and if it is less than a predetermined value, diagonal stretching can be continued without correction.
  • the above correction can be performed when the amount of slack detected at a distance between rolls of 1000 mm is, for example, 3 mm or more, 5 mm or more, 10 mm or more, or 15 mm or more.
  • feedback correction slack correction
  • the correction for changing the clip pitch can be performed by any appropriate method as long as the effect of the present invention can be obtained.
  • Feedback correction increases the clip pitch of the clip that grips the far end with respect to the slackened portion, and increases the clip pitch of the clip that grips the end near the slackened portion. It can be done by reducing or combining these. However, even if the clip pitch is reduced, the film may not shrink but only loosen, so by increasing the clip pitch of the clip that grips the end far from the slackened part, , It is preferable to perform feedback correction. More specifically, when the slackened portion is one of the left and right ends of the stretched film, feedback correction is preferably performed by increasing the clip pitch of the clip that grips the other end. Can be done.
  • the timing of changing the clip pitch is not particularly limited as long as the effect of the present invention can be obtained.
  • the clip pitch after correction can be changed at an arbitrary timing until the film is released from the clip.
  • the clip traveling ahead is more preferably The corrected clip pitch is applied from the time when the film passes from 1/2 to 9/10 of the traveling section of the obliquely stretched zone until the film is released from the clip.
  • the clip traveling ahead of the transport line passes through the intermediate point of the traveling section of the diagonal extension zone, preferably the clip traveling ahead is 1 / of the traveling section of the oblique extension zone.
  • the application of the feedback correction is started from the time when the passage has passed from 2 to 9/10, and the clip pitch is changed so that a desired correction amount can be obtained at the end point of the oblique stretching zone. Further, it is preferable to maintain the correction amount until the film is released from the clip even after the transition from the diagonally stretched zone to the open zone. In the latter half of the diagonal stretching, particularly in the final stage, at least one clip pitch is maintained constant or changes at a small rate of change. Therefore, the present invention is made by correcting the clip pitch at that timing. The effect of can be preferably obtained.
  • the target film is preferably heated to Tg + 3 ° C. to Tg + 20 ° C., more preferably Tg + 3 ° C. to Tg + 10 ° C., and even more preferably Tg + 4 ° C. to Tg + 8 ° C.
  • the feedback correction at a temperature equal to or slightly higher than Tg, the effects of the present invention can be preferably obtained.
  • the film that has passed through the diagonally stretched zone while receiving feedback correction at the above temperature and has transitioned to the open zone is heat-fixed and then required while maintaining the correction amount performed in the diagonally stretched zone. After being cooled accordingly, it is released from the clip. Thermal fixation and cooling are as described in Section A-4.
  • FIG. 6A is a schematic view showing a profile of the clip pitch in the method for manufacturing a retardation film according to one embodiment of the present invention.
  • the clip X of the right and left in the preheating zone B, clip pitch Y is the P 1 both in the initial oblique stretching before being feedback correction, while at the same time enters the oblique stretching zone C, one clip starts the increase in X clip pitch, starts to decrease in the clip pitch of the other clips Y, the clip pitch of the clip X is increased to P 2, after the clip pitches of clips Y was reduced to P 3 is , While maintaining the clip pitch of clip X at P 2 , the clip pitch of clip Y is increased to P 2.
  • FIG. 6B is a schematic view showing a profile of the clip pitch in the method for producing a retardation film according to another embodiment of the present invention.
  • oblique stretching is performed in the same pattern as the embodiment shown in FIG. 6A, the clip X of the left and right during the heat in heat and open zone D, both from P 2 clips pitch Y open from reduced film to P 3.
  • clip pitch of the clip X is gradually increased to P 2 'from P 2
  • clip clip pitch of X is reduced to 'P 3 from' P 2
  • clip pitches of clips Y is reduced from P 2 to P 3.
  • changes to the clip pitch corrected (changed to P 2 ') is in the feedback end point from the point where the application of the correction is started (FIGS. 6A and 6B, 2/3 of oblique stretching zone It is preferable to gradually proceed from the time of passing to the end point).
  • the correction amount at the end of diagonal stretching (
  • the change in the clip pitch can be performed by adjusting the separation distance between the reference rail and the pitch setting rail as described above. These adjustments can be made with or without stopping the transport line.
  • the correction amount of the clip pitch at the end of diagonal stretching in the above feedback correction (
  • the amount of correction of the clip pitch is preferably an amount that exceeds the difference in length between the left and right ends of the stretched film between the transport rolls, and more preferably 1.4 to 5.0 times the difference in length.
  • the correction amount may be more preferably 1.6 times to 4.0 times, and even more preferably 1.8 times to 3.0 times. If the amount of correction for the clip pitch is less than or equal to the difference in length between the left and right ends, the amount of reduction in slack may be insufficient.
  • L'(unit: mm) in the lengths of the left and right ends of the stretched film between the transport rolls is the length of the stretched film between the transport rolls calculated based on the following formulas (1) and (2). It can be calculated by substituting L (unit: mm) into the following equation (3).
  • d represents the detected amount of slack (unit: mm)
  • w represents the mass per 1 m of the film (unit: g)
  • g represents the gravitational acceleration
  • S represents the above.
  • H represents the tension (unit: N / m) applied to the end side where the slack is generated, which is calculated from the formula (1).
  • the amount of slack reduced by the feedback correction (the amount of slack of the stretched film obtained before the feedback correction-the amount of slack of the stretched film obtained after the feedback correction: however, it is measured at a distance between the transport rolls of 1000 mm.
  • the amount of slack can be, for example, 3 mm or more, preferably 5 mm or more, more preferably 8 mm or more, still more preferably 10 mm or more.
  • the amount of slack in the stretched film obtained after feedback correction may be, for example, less than 15 mm, preferably 10 mm or less, more preferably 8 mm or less, still more preferably 5 mm or less, and even more preferably less than 3 mm.
  • a resin film having a birefringence ⁇ n of 0.025 or less in the unstretched state is used as the film to be stretched.
  • the birefringence ⁇ n of the resin film is preferably 0.022 or less, more preferably 0.020 or less, and further preferably 0.018 or less.
  • the birefringence ⁇ n of the resin film is preferably 0.004 or more, more preferably 0.007 or more, still more preferably 0.010 or more, and particularly preferably 0.012 or more.
  • the resin film having such a large birefringence ⁇ n by using the resin film having such a large birefringence ⁇ n, it is possible to obtain a diagonally stretched retardation film having a small variation in in-plane retardation in the width direction without any trouble such as breakage. If the birefringence ⁇ n is small, the problem of variation in the in-plane phase difference in the width direction does not occur, but the film thickness for obtaining a desired in-plane phase difference becomes large. If the birefringence ⁇ n is too large, it may not be possible to control the variation in the in-plane phase difference in the width direction.
  • any suitable resin can be adopted as long as it has the above-mentioned birefringence ⁇ n.
  • Specific examples include polycarbonate-based resins, polyester carbonate-based resins, polyester-based resins, polyvinyl acetal-based resins, polyarylate-based resins, cyclic olefin-based resins, cellulose-based resins, polyvinyl alcohol-based resins, polyamide-based resins, and polyimide-based resins.
  • examples thereof include polyether resins, polystyrene resins, and acrylic resins. These resins may be used alone or in combination (eg, blending, copolymerizing).
  • it is a polycarbonate-based resin or a polyester carbonate-based resin (hereinafter, may be simply referred to as a polycarbonate-based resin). This is because the effect of the embodiment of the present invention is remarkable.
  • the polycarbonate-based resin preferably contains a structural unit derived from a dihydroxy compound having a bonding structure represented by the following formula (I).
  • dihydroxy compound examples include a compound represented by the following formula (II).
  • dihydroxy compounds include isosorbide, isomannide, and isoidet, which are in a stereoisomeric relationship. These may be used alone or in combination of two or more.
  • the above dihydroxy compound and another dihydroxy compound may be used in combination.
  • an alicyclic dihydroxy compound represented by the following formula (III) can be mentioned.
  • R 1 represents a cycloalkylene group having 4 to 20 carbon atoms.
  • the alicyclic dihydroxy compound can be, for example, tricyclodecanedimethanol, pentacyclopentadecanedimethanol.
  • R 1 in formula (III) is the following formula (IV) (wherein, n represents 0 or 1) the various isomers represented by.
  • the polycarbonate resin contains a structural unit represented by the following formula (V). That is, the polycarbonate resin can be a copolymer of diphenyl carbonate, isosorbide, and tricyclodecanedimethanol.
  • the glass transition temperature of the polycarbonate resin is preferably 110 ° C. or higher and 250 ° C. or lower, more preferably 120 ° C. or higher and 230 ° C. or lower. If the glass transition temperature is excessively low, the heat resistance tends to deteriorate, which may cause a dimensional change after film molding. If the glass transition temperature is excessively high, the molding stability during film molding may be deteriorated, and the transparency of the film may be impaired.
  • the glass transition temperature is determined according to JIS K 7121 (1987).
  • the obtained retardation film The retardation film obtained by stretching the film to be stretched preferably has a refractive index characteristic of nx> ny.
  • the retardation film can preferably function as a ⁇ / 4 plate.
  • the in-plane retardation Re (550) of the retardation film ( ⁇ / 4 plate) is preferably 100 nm to 200 nm, more preferably 120 nm to 160 nm, and further preferably 130 nm to 150 nm.
  • the retardation film can preferably function as a ⁇ / 2 plate.
  • the in-plane retardation Re (550) of the retardation film ( ⁇ / 2 plate) is preferably 230 nm to 310 nm, more preferably 240 nm to 300 nm, and further preferably 260 nm to 290 nm.
  • a retardation film having a desired in-plane retardation can be obtained.
  • Re ( ⁇ ) is an in-plane phase difference of the film measured with light having a wavelength of ⁇ nm at 23 ° C. Therefore, Re (550) is the in-plane phase difference of the film measured with light having a wavelength of 550 nm at 23 ° C.
  • the variation of the in-plane retardation Re (550) in the width direction is preferably within 6%, more preferably 5%, with respect to the average value of the in-plane retardation Re (550) in the width direction. It is within, more preferably within 4%, and particularly preferably within 2.2%.
  • a resin film having a large birefringence ⁇ n can be used to obtain a diagonally stretched retardation film having a small variation in in-plane retardation in the width direction without any trouble such as breakage.
  • the variation is obtained, for example, as follows.
  • the in-plane retardation Re (550) at selected positions along the entire width direction at intervals of 10 mm is measured.
  • the average value is calculated from the measured value, the maximum value and the minimum value are picked up, and the variation is calculated by the following formula.
  • Variation (%) (maximum value-minimum value) / average value x 100
  • the retardation film has a slow phase axis because the refractive index characteristics show the relationship of nx> ny as described above.
  • the direction of the slow-phase axis (the angle formed by the slow-phase axis direction and the elongated direction of the obtained retardation film) can be set to any appropriate direction (representative) according to the purpose by appropriately setting the conditions for oblique stretching. In particular, it can be controlled in an oblique direction with respect to the long direction).
  • the angle formed by the slow axis direction and the long direction is preferably 40 ° to 50 ° or 130 ° to 140 °, more preferably 42 °.
  • the angle formed by the slow axis direction and the long direction is preferably 10 ° to 20 ° or 100 ° to 110 °, more preferably 12 °. -18 ° or 102 ° -108 °, more preferably 14 ° -16 ° or 104 ° -106 °; or preferably 70 ° -80 ° or 160 ° -170 °, more preferably. It is 72 ° to 78 ° or 162 ° to 168 °, more preferably 74 ° to 76 ° or 164 ° to 166 °.
  • the thickness of the retardation film can change according to the desired in-plane retardation.
  • the thickness of the retardation film is preferably 15 ⁇ m to 45 ⁇ m, more preferably 25 ⁇ m to 40 ⁇ m, and even more preferably 30 ⁇ m to 40 ⁇ m.
  • the thickness of the retardation film is preferably 15 ⁇ m to 40 ⁇ m, more preferably 15 ⁇ m to 30 ⁇ m.
  • the thickness is significantly thinner than that of a normal retardation film (stretched film of a resin film). A desired in-plane phase difference can be achieved.
  • the retardation film preferably exhibits so-called flat wavelength dependence. Specifically, the in-plane phase difference satisfies the relationship of Re (450) ⁇ Re (550) ⁇ Re (650).
  • Re (450) / Re (550) is preferably 0.97 to 1.03, and more preferably 0.98 to 1.02.
  • Re (550) / Re (650) is preferably 0.97 to 1.03, and more preferably 0.98 to 1.02.
  • the absolute value of the photoelastic coefficient of the retardation film is preferably 2 ⁇ 10-12 (m 2 / N) to 100 ⁇ 10-12 (m 2 / N), and more preferably 5 ⁇ 10-12. It is (m 2 / N) to 50 ⁇ 10-12 (m 2 / N).
  • Thickness Measured using a dial gauge manufactured by PEACOCK, product name "DG-205 type pds-2".
  • the in-plane phase difference Re (550) was measured using Axoscan manufactured by Axometrics.
  • the birefringence ⁇ n was obtained by dividing the in-plane retardation Re (550) by the film thickness.
  • (3) Orientation angle (slow phase axial direction) A sample was prepared by cutting out the central portion of the film to be measured into a square shape having a width of 50 mm and a length of 50 mm so that one side was parallel to the width direction of the film.
  • This sample was measured using Axoscan manufactured by Axometrics, and the orientation angle at a wavelength of 590 nm was measured.
  • Glass transition temperature (Tg) It was measured according to JIS K 7121.
  • Variation In-plane retardation Re (550) at arbitrary positions in the elongated direction of the elongated retardation films obtained in Examples and Comparative Examples at 10 mm intervals along the entire width direction. ) was measured. The average value was calculated from the measured value, the maximum value and the minimum value were picked up, and the variation was calculated by the following formula.
  • the pressure was changed from normal pressure to 13.3 kPa, and the generated phenol was extracted from the reaction vessel while raising the heating tank temperature to 190 ° C. in 1 hour.
  • the pressure inside the reaction vessel is set to 6.67 kPa, the heating tank temperature is raised to 230 ° C. in 15 minutes, and the generated phenol is generated. It was taken out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C. in 8 minutes, and the pressure in the reaction vessel was brought to 0.200 kPa or less in order to remove the generated phenol. After reaching a predetermined stirring torque, the reaction was terminated, and the produced reaction product was extruded into water to obtain pellets of a polycarbonate copolymer (PC resin 1).
  • PC resin 1 polycarbonate copolymer
  • SPG spiroglycol
  • SPG bis [9- (2-phenoxycarbonylethyl) fluorene-9-yl] methane
  • Example 1 (Diagonal stretching before feedback correction)
  • the resin film 1 obtained in Production Example 1 was obliquely stretched using a stretching device as shown in FIGS. 2 to 4 to obtain a retardation film.
  • the polyester carbonate resin film was preheated to 145 ° C. in the preheating zone of the stretching apparatus.
  • the clip pitch (P 1 ) of the left and right clips was 125 mm.
  • the oblique stretching zone C to start the reduction in the clip pitches increased and left clips clip pitch of the right clip, clip pitch of the left clip with increasing clip pitch of the right clip to the P 2 the was reduced to P 3.
  • the clip pitch change rate (P 2 / P 1 ) of the right side clip is 1.42
  • the clip pitch change rate (P 3 / P 1 ) of the left side clip is 0.78
  • the original width of the film was 1.45 times.
  • the increase of the clip pitch of the left clip was started and increased from P 3 to P 2 .
  • the rate of change in the clip pitch (P 2 / P 3 ) of the left clip was 1.82
  • the lateral stretching ratio with respect to the original width of the film was 1.9 times.
  • the diagonally stretched zone C was set to Tg + 3.2 ° C. (143.2 ° C.).
  • heat fixing was performed for 60 seconds in the heat fixing and open zone D.
  • the temperature of the heat fixing zone on the left side was set to 132 ° C.
  • the temperature of the heat fixing zone on the right side was set to 115 ° C. That is, the temperature difference between the left side and the right side in heat fixation was 17 ° C.
  • the film was blown from both the upper and lower directions at a left side temperature of 132 ° C. and a right side temperature of 115 ° C. (that is, the same temperature as the heat fixing temperature) and a wind speed of 30 m / sec.
  • the heat-fixed film was cooled to 100 ° C., and then the left and right clips were opened.
  • the in-plane retardation Re (550) of the obtained retardation film was 147 nm, the thickness was 30 ⁇ m, and the angle between the slow phase axial direction and the elongated direction was 45 °.
  • the obtained retardation film was subjected to the evaluations (5) to (7) above. The results are shown in Table 1.
  • Example 2 In heat fixing, the temperature of the heat fixing zone on the left side was set to 132 ° C, and the temperature of the heat fixing zone on the right side was set to 122 ° C (the temperature difference between the left side and the right side in heat fixing was set to 10 ° C). Further, a retardation film was obtained in the same manner as in Example 1 except that the wind speed was set to 25 m / sec. The in-plane retardation Re (550) of the obtained retardation film was 147 nm, the thickness was 30 ⁇ m, and the angle between the slow phase axial direction and the elongated direction was 45 °. The obtained retardation film was subjected to the evaluations (5) to (7) above. The results are shown in Table 1.
  • Example 3 In heat fixing, the temperature of the heat fixing zone on the left side was set to 131 ° C, and the temperature of the heat fixing zone on the right side was set to 124 ° C (the temperature difference between the left side and the right side in heat fixing was set to 7 ° C). Further, a retardation film was obtained in the same manner as in Example 1 except that the wind speed was set to 25 m / sec. The in-plane retardation Re (550) of the obtained retardation film was 140 nm, the thickness was 40 ⁇ m, and the angle between the slow phase axial direction and the elongated direction was 45 °. The obtained retardation film was subjected to the evaluations (5) to (7) above. The results are shown in Table 1.
  • Example 4 The resin film 2 obtained in Production Example 2 was used, and the temperature of the heat fixing zone on the left side was set to 137 ° C. and the temperature of the heat fixing zone on the right side was set to 130 ° C. in heat fixing (heat).
  • a retardation film was obtained in the same manner as in Example 1 except that the temperature difference between the left side and the right side in fixing was set to 7 ° C.).
  • the in-plane retardation Re (550) of the obtained retardation film was 140 nm, the thickness was 57 ⁇ m, and the angle between the slow phase axial direction and the elongated direction was 45 °.
  • the obtained retardation film was subjected to the evaluations (5) to (7) above. The results are shown in Table 1.
  • Example 5 A retardation film was obtained in the same manner as in Example 4 except that the wind speed was 25 m / sec.
  • the in-plane retardation Re (550) of the obtained retardation film was 137 nm, the thickness was 40 ⁇ m, and the angle between the slow phase axial direction and the elongated direction was 45 °.
  • the obtained retardation film was subjected to the evaluations (5) to (7) above. The results are shown in Table 1.
  • ⁇ Comparative example 2> A retardation film was obtained in the same manner as in Example 1 except that slack correction (feedback correction) was not performed and the wind speed was set to 10 m / sec.
  • the in-plane retardation Re (550) of the obtained retardation film was 137 nm, the thickness was 30 ⁇ m, and the angle between the slow phase axial direction and the elongated direction was 45 °.
  • the obtained retardation film was subjected to the evaluations (5) to (7) above. The results are shown in Table 1.
  • the production method according to the embodiment of the present invention is suitably used for producing a retardation film, and as a result, can contribute to the production of an image display device such as a liquid crystal display device (LCD) and an organic electroluminescence display device (OLED). ..
  • LCD liquid crystal display device
  • OLED organic electroluminescence display device

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Thermal Sciences (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Polarising Elements (AREA)
PCT/JP2020/047860 2020-03-24 2020-12-22 位相差フィルムの製造方法 WO2021192463A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080098268.7A CN115280195A (zh) 2020-03-24 2020-12-22 相位差薄膜的制造方法
KR1020227026289A KR20220122728A (ko) 2020-03-24 2020-12-22 위상차 필름의 제조 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-052271 2020-03-24
JP2020052271A JP7513410B2 (ja) 2020-03-24 2020-03-24 位相差フィルムの製造方法

Publications (1)

Publication Number Publication Date
WO2021192463A1 true WO2021192463A1 (ja) 2021-09-30

Family

ID=77886463

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/047860 WO2021192463A1 (ja) 2020-03-24 2020-12-22 位相差フィルムの製造方法

Country Status (4)

Country Link
JP (1) JP7513410B2 (ko)
KR (1) KR20220122728A (ko)
CN (1) CN115280195A (ko)
WO (1) WO2021192463A1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230073120A (ko) * 2021-11-18 2023-05-25 닛토덴코 가부시키가이샤 연신 필름의 제조 방법 및 광학 적층체의 제조 방법

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7059429B1 (ja) 2021-09-10 2022-04-25 日東電工株式会社 延伸フィルムの製造方法および光学積層体の製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013136725A1 (ja) * 2012-03-14 2013-09-19 コニカミノルタ株式会社 長尺延伸フィルムの製造方法、及び斜め延伸装置
WO2019150897A1 (ja) * 2018-02-02 2019-08-08 日東電工株式会社 延伸フィルムの製造方法
JP2019179099A (ja) * 2018-03-30 2019-10-17 日東電工株式会社 円偏光板

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100460950C (zh) * 2004-10-07 2009-02-11 日东电工株式会社 双折射薄膜的制造方法以及该双折射薄膜的应用
JP4845619B2 (ja) 2006-07-19 2011-12-28 東芝機械株式会社 シート・フィルムの斜め延伸方法およびクリップ式シート・フィルム延伸装置
JP5749289B2 (ja) * 2013-03-28 2015-07-15 富士フイルム株式会社 光学フィルムの製造方法
JP7020942B2 (ja) * 2018-02-01 2022-02-16 日東電工株式会社 フィルム延伸装置および位相差フィルムの製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013136725A1 (ja) * 2012-03-14 2013-09-19 コニカミノルタ株式会社 長尺延伸フィルムの製造方法、及び斜め延伸装置
WO2019150897A1 (ja) * 2018-02-02 2019-08-08 日東電工株式会社 延伸フィルムの製造方法
JP2019179099A (ja) * 2018-03-30 2019-10-17 日東電工株式会社 円偏光板

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230073120A (ko) * 2021-11-18 2023-05-25 닛토덴코 가부시키가이샤 연신 필름의 제조 방법 및 광학 적층체의 제조 방법
KR102593515B1 (ko) 2021-11-18 2023-10-25 닛토덴코 가부시키가이샤 연신 필름의 제조 방법 및 광학 적층체의 제조 방법

Also Published As

Publication number Publication date
JP2021152571A (ja) 2021-09-30
CN115280195A (zh) 2022-11-01
KR20220122728A (ko) 2022-09-02
TW202142386A (zh) 2021-11-16
JP7513410B2 (ja) 2024-07-09

Similar Documents

Publication Publication Date Title
JP7253413B2 (ja) 延伸フィルムの製造方法
JP7016269B2 (ja) 延伸フィルムの製造方法
WO2021192463A1 (ja) 位相差フィルムの製造方法
CN115782147B (zh) 拉伸膜的制造方法和光学层叠体的制造方法
JP7012179B1 (ja) 延伸フィルムの製造方法
JP7079365B1 (ja) 延伸フィルムの製造方法、光学積層体の製造方法およびフィルム延伸装置
KR102531094B1 (ko) 연신 필름의 제조 방법 및 광학 적층체의 제조 방법
JP7015950B1 (ja) 延伸フィルムの製造方法
JP7096943B1 (ja) 延伸フィルムの製造方法および光学積層体の製造方法
CN115122621B (zh) 延伸膜的制造方法
JP7096940B1 (ja) 延伸フィルムの製造方法および光学積層体の製造方法
JP7048814B1 (ja) 延伸フィルムの製造方法および光学積層体の製造方法
KR102531093B1 (ko) 연신 필름의 제조 방법 및 광학 적층체의 제조 방법
JP7038240B1 (ja) 延伸フィルムの製造方法
JP2022149739A (ja) 延伸フィルムの製造方法
CN115122617A (zh) 拉伸膜的制造方法

Legal Events

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

Ref document number: 20927840

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20227026289

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20927840

Country of ref document: EP

Kind code of ref document: A1