WO2018142991A1 - Procédé de production d'un film étiré obliquement, procédé de production d'une plaque de polarisation et procédé de production d'un dispositif d'affichage à cristaux liquides - Google Patents

Procédé de production d'un film étiré obliquement, procédé de production d'une plaque de polarisation et procédé de production d'un dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2018142991A1
WO2018142991A1 PCT/JP2018/001820 JP2018001820W WO2018142991A1 WO 2018142991 A1 WO2018142991 A1 WO 2018142991A1 JP 2018001820 W JP2018001820 W JP 2018001820W WO 2018142991 A1 WO2018142991 A1 WO 2018142991A1
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Prior art keywords
thermoplastic resin
film
resin film
obliquely stretched
producing
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PCT/JP2018/001820
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English (en)
Japanese (ja)
Inventor
充 五十嵐
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日本ゼオン株式会社
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Priority to JP2018566066A priority Critical patent/JP7063275B2/ja
Publication of WO2018142991A1 publication Critical patent/WO2018142991A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Definitions

  • the present invention relates to a method for producing an obliquely stretched film, a method for producing a polarizing plate, and a method for producing a liquid crystal display device.
  • an optical member such as a retardation film is used to improve performance.
  • the retardation film is used for antireflection of a mobile device, an organic EL television or the like, or for optical compensation of a liquid crystal display device
  • its slow axis is neither parallel nor perpendicular to the transmission axis of the polarizer. It is required to be at an angle.
  • the transmission axis of the polarizer is usually parallel to the long side direction or the short side direction of the rectangular display surface of the apparatus. Therefore, there is a demand for a rectangular retardation film having a slow axis in an oblique direction with respect to its side.
  • a retardation film has been produced by longitudinally stretching or transversely stretching a long film before stretching.
  • the longitudinal stretching represents stretching in the longitudinal direction of the long film
  • the lateral stretching represents stretching in the width direction of the long film.
  • the film is cut out so that the sides are directed in an oblique direction from the width direction of the long film. Is required.
  • the film is cut so that the sides are oriented diagonally from the width direction of the long film, the amount of film to be discarded becomes large, and it becomes difficult to manufacture roll-to-roll. Lower. Therefore, in order to improve production efficiency, it has been proposed to obliquely stretch a long film before stretching (see, for example, Patent Document 1).
  • thermoplastic resin film In order to efficiently produce an obliquely stretched film, it is preferable to continuously obliquely stretch the continuously conveyed thermoplastic resin film.
  • continuously convey the film for example, joining the leading edge of the subsequent film fed from the second film roll to the trailing edge of the preceding film fed from the first film roll.
  • the film is obliquely stretched. In doing so, the joint portion breaks, and as a result, the obliquely stretched film may not be continuously manufactured.
  • thermoplastic resin film that is transported in advance and is transported downstream.
  • a joining step for joining a thermoplastic resin film via a joining portion, a preheating step for preheating while continuously conveying the thermoplastic resin film joined via the joining portion, and the preheated thermoplastic resin film An obliquely stretching step of obliquely stretching while continuously transporting the film, and a method for producing an obliquely stretched film, wherein the thermoplastic resin film transported in advance and the thermoplastic resin transported downstream The film is the same thermoplastic resin film, the preheating temperature of the joint in the preheating step is T (° C.), and the preheating time of the joint in the preheating step is t (seconds).
  • thermoplastic resin in the thermoplastic resin film was Tg (° C.)
  • Tg glass transition temperature of the thermoplastic resin in the thermoplastic resin film
  • the above formulas (1) and (2) If it satisfies, it can suppress that the junction part of a thermoplastic resin film fractures
  • the preheating temperature T (° C.) of the joint portion was measured by measuring the temperature of a space having a distance of 100 mm in the film normal direction from the joint portion of the thermoplastic resin film using a thermocouple in the preheating step. Adopted as the preheating temperature T (° C.) of the joint in the preheating process. Further, the glass transition temperature Tg of the thermoplastic resin was measured by the measuring method described in JIS K7121. Furthermore, in the present invention, the “same thermoplastic resin film” includes, in addition to the case where the thermoplastic resin films are completely the same in a strict sense, within the range in which the effects of the present invention can be obtained. This includes cases where the composition and thickness are inevitably different due to errors and the like.
  • thermoplastic resin film transported in advance and the thermoplastic resin film transported in the subsequent manner it is preferable to join the thermoplastic resin film transported in advance and the thermoplastic resin film transported in the subsequent manner by thermal fusion.
  • thermoplastic resin film transported in advance and the thermoplastic resin film transported downstream are joined by thermal fusion, the above formulas (1) and (2) are satisfied. This is because the effect of suppressing breakage is excellent.
  • thermoplastic resin film conveyed ahead and the thermoplastic resin film conveyed downstream are that average thickness is 50 micrometers or more and 300 micrometers or less. preferable.
  • the thermoplastic resin film that is transported in advance and the thermoplastic resin film that is transported in a subsequent manner have an average thickness of 50 ⁇ m or more and 300 ⁇ m or less, so that the joining portion of the thermoplastic resin film can be formed in the oblique stretching step. It can suppress more reliably that it fractures.
  • the average thickness of the thermoplastic resin film transported in advance and the thermoplastic resin film transported downstream is determined by snap gauges at a plurality of points at intervals of 5 cm in the width direction of the thermoplastic resin film. It calculates
  • the glass transition temperature Tg of the thermoplastic resin in the thermoplastic resin film is 100 ° C. or higher and 180 ° C. or lower.
  • the manufacturing method of the polarizing plate of this invention is the diagonally stretched film manufactured with the manufacturing method of the diagonally stretched film mentioned above, and polarized light.
  • a polarizing plate is produced by laminating a child.
  • the manufacturing method of the liquid crystal display device of this invention is a liquid crystal display provided with the polarizing plate manufactured with the manufacturing method of the polarizing plate mentioned above. A device is manufactured. Thus, if the manufacturing method of the polarizing plate mentioned above is used, a polarizing plate can be manufactured efficiently and by extension, a liquid crystal display device can be manufactured efficiently.
  • the manufacturing method of the diagonally stretched film of this invention can be used when manufacturing a diagonally stretched film.
  • the manufacturing method of the polarizing plate of this invention can be used when manufacturing a polarizing plate provided with the diagonally stretched film manufactured by the manufacturing method of the diagonally stretched film of this invention.
  • the manufacturing method of the liquid crystal display device of this invention can be used when manufacturing a liquid crystal display device provided with the polarizing plate manufactured by the manufacturing method of the polarizing plate of this invention.
  • the method for producing an obliquely stretched film of the present invention is a method for producing an obliquely stretched film.
  • the manufacturing method of the diagonally stretched film of this invention is a process (joining process) which joins the thermoplastic resin film conveyed ahead and the thermoplastic resin film conveyed behind, via a junction part. ), A step of preheating (preheating step) under predetermined conditions while continuously conveying the thermoplastic resin film bonded through the bonding portion, and obliquely stretching while continuously conveying the preheated thermoplastic resin film
  • a process (oblique stretching process) and optionally further includes other processes.
  • thermoplastic resin film conveyed ahead and the thermoplastic resin film conveyed downstream are joined via a junction part, The said junction part
  • thermoplastic resin film joined through the film is preheated under predetermined conditions while being continuously conveyed, and obliquely stretched while continuously conveying the preheated thermoplastic resin film
  • the thermoplastic resin is It is possible to continuously manufacture obliquely stretched films while suppressing breakage of the joint portion of the film.
  • thermoplastic resin film transported in advance and the thermoplastic resin film transported in the subsequent way through the joint portion Enables continuous production of obliquely stretched films.
  • thermoplastic resin film conveyed ahead and the thermoplastic resin film conveyed downstream are the same thermoplastic resin film.
  • the bonding method is not particularly limited, and is heat fusion (sometimes referred to as “thermal welding”), tape bonding, ultrasonic fusion (sometimes referred to as “ultrasonic welding”), laser fusion (“laser”). Sometimes referred to as “welding”).
  • thermal bonding and tape bonding are preferred, and thermal fusion is more preferable in that the effect of suppressing breakage of the bonded portion of the thermoplastic resin film when the bonded portion is preheated under predetermined conditions is particularly excellent. preferable.
  • thermoplastic resin film Although there is no restriction
  • the average thickness of the thermoplastic resin film is within the above range, the joint portion of the thermoplastic resin film can be more reliably suppressed from breaking in the oblique stretching step.
  • thermoplastic resin examples include, for example, alicyclic structure-containing polymer resins such as norbornene resins; polyolefin resins such as polyethylene resins and polypropylene resins; cellulose resins such as diacetyl cellulose resins and triacetyl cellulose resins; Polyimide resin, polyamideimide resin, polyamide resin, polyetherimide resin, polyetheretherketone resin, polyetherketone resin, polyketone sulfide resin, polyethersulfone resin, polysulfone resin, polyphenylene sulfide resin, polyphenylene oxide resin, polyethylene terephthalate resin, Polybutylene terephthalate resin, polyethylene naphthalate resin, polyacetal resin, polycarbonate resin, polyarylate resin, (meth) acrylic resin Other resins such as polyvinyl alcohol resin, polypropylene resin, cellulose resin, epoxy resin, phenol resin; (meth) acrylic acid ester-viny
  • alicyclic structure-containing polymer resins such as norbornene resins are preferable.
  • the details of the alicyclic structure and the norbornene-based resin are as described in Patent Document 1.
  • the weight average molecular weight (Mw) of the thermoplastic resin is not particularly limited, but is preferably 10,000 or more, more preferably 15,000 or more, particularly preferably 20,000 or more, preferably 100,000 or less, more preferably 80,000 or less, and 50,000 or less. Is particularly preferred.
  • the weight average molecular weight (Mw) of the thermoplastic resin is within the above range, the mechanical strength and molding processability of the obliquely stretched film can be highly balanced.
  • the weight average molecular weight (Mw) of the thermoplastic resin is a weight average molecular weight in terms of polyisoprene measured by gel permeation chromatography using cyclohexane as a solvent.
  • toluene may be used as a solvent when the sample does not dissolve in cyclohexane.
  • the weight average molecular weight in terms of polystyrene is used.
  • the molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of the thermoplastic resin is not particularly limited, but is preferably 1.2 or more, more preferably 1.5 or more, and more preferably 1.8 or more. Particularly preferred is 3.5 or less, more preferred is 3.0 or less, and particularly preferred is 2.7 or less.
  • the amount of low molecular components becomes small, so that relaxation during high temperature exposure can be suppressed and the stability of the obliquely stretched film can be improved.
  • the glass transition temperature Tg of the thermoplastic resin is preferably 100 ° C. or higher, more preferably 110 ° C. or higher, preferably 180 ° C. or lower, more preferably 170 ° C. or lower.
  • heat fusion In the heat fusion, bonding is usually performed using a heat sealer device.
  • the heat sealer is heated (heated) with a heater so as to sandwich a thermoplastic resin film, and is fused (welded).
  • the heater is heated to a predetermined temperature that dissolves the thermoplastic resin film but does not decompose it.
  • a part of the thermoplastic resin film is melted and bonded, and the preceding thermoplastic resin film and the subsequent thermoplastic resin film are joined.
  • the preceding thermoplastic resin film A and the following thermoplastic resin film B are heat-sealed using a heat sealer device 10.
  • the heat sealer device 10 includes an upper welding head 21 and a lower welding head 22 that are provided so as to sandwich the conveyance path of the film 3 vertically.
  • the upper welding head 21 has a heater 23 exposed from the lower surface, and the lower welding head 22 has a heater 24 exposed from the upper surface.
  • the welding heads 21 and 22 are moved between a heating position where the heaters 23 and 24 are brought into contact with the film 3 and a retreat position where the heaters 23 and 24 are separated from the film 3 by a shift mechanism (not shown).
  • the heaters 23 and 24 are temperature controlled by temperature controllers 25 and 26.
  • the procedure for bonding the film using the heat sealer 10 will be described.
  • the leading edge of the trailing film B is superimposed on the trailing edge of the preceding film A.
  • the upper welding head 21 and the lower welding head 22 are moved to the heating position.
  • the temperature of each heater 23 and 24 is set to a predetermined temperature that dissolves the film 3 but does not decompose it.
  • the heaters 23 and 24 are brought into contact with a region where the films A and B are overlapped. A part of the film is melted and bonded by heating with the heaters 23 and 24 for a predetermined time.
  • the heaters 23 and 24 are heated for a predetermined time and then stopped, and the joint portion 28 is naturally cooled in a compressed state.
  • the upper welding head 21 and the lower welding head 22 are moved to the retracted position.
  • thermoplastic resin films A and B joined by thermal fusion are conveyed to the oblique stretching machine 60.
  • thermoplastic resin film B is conveyed to the oblique stretching machine 60 using the roller 10a and the roller 10b.
  • thermoplastic resin film B disappears, the thermoplastic resin film A is joined to the thermoplastic resin film B by heat fusion in the same operation as described above, and the joined thermoplastic films A, B is conveyed to the oblique stretching machine 60, and finally, only the thermoplastic resin film A is conveyed to the oblique stretching machine 60. Moreover, when the thermoplastic resin film A runs out, the operation shown above is performed. By repeating these operations, the thermoplastic resin film can be continuously supplied to the oblique stretching machine 60.
  • tape joining for example, a double-sided tape in which an adhesive layer is provided on both surfaces of a substrate exhibiting substantially the same stretching behavior as a thermoplastic resin film (raw film) in a temperature range of a stretching temperature at which an oblique stretching process is performed.
  • a double-sided tape in which an adhesive layer is provided on both surfaces of a substrate exhibiting substantially the same stretching behavior as a thermoplastic resin film (raw film) in a temperature range of a stretching temperature at which an oblique stretching process is performed.
  • the other is bonded by bonding the other. They can be joined in the same manner as described above.
  • the ultrasonic fusion is a method in which electric energy is converted into mechanical vibration energy, and at the same time, strong frictional heat is generated on the joining surface of the thermoplastic resin film to melt and bond the thermoplastic resin. is there.
  • a thermoplastic resin film can be mechanically vibrated at an amplitude of 0.05 mm and 20,000 to 28,000 times per second to generate heat and be instantly fused (welded).
  • ultrasonic welding is performed using an ultrasonic bonding device (for example, see FIG. 7 of JP 2009-90650 A). Except for joining, joining can be performed in the same manner as described above.
  • a fusion laser beam is irradiated along the joining line from the normal direction of the thermoplastic resin film.
  • the fusion laser beam melts and joins the preceding thermoplastic resin film and the subsequent thermoplastic resin film.
  • the laser fusion apparatus that performs laser fusion irradiates the fusion laser beam with the joining surface of the preceding thermoplastic resin film (the joining surface of the subsequent thermoplastic resin film) as the focal position.
  • the fusion laser beam is irradiated, heat is generated and melted at the joining surface of the preceding thermoplastic resin film, and the heat is transferred to the joining surface of the succeeding thermoplastic resin film and melted.
  • thermoplastic resin film and the subsequent thermoplastic resin film are fused (welded) at the joint.
  • bonding can be performed in the same manner as described above except that laser fusion is performed using a laser fusion device or the like.
  • the joined portion is preheated under the conditions satisfying the following formulas (1) and (2) while continuously transporting the thermoplastic resin film joined through the joined portion. Thereby, it can suppress that the junction part of a thermoplastic resin film fractures
  • parts other than the joint parts consisting only of the thermoplastic resin film A and parts consisting only of the thermoplastic resin film B are subject to conditions other than the following. You may preheat.
  • T in Formula (1) represents the preheating temperature (° C.) of the joint in the preheating step
  • Tg in Formula (1) represents the glass transition temperature (° C.) of the thermoplastic resin in the thermoplastic resin film.
  • T in equation (2) represents the preheating time (seconds) of the joint in the preheating step.
  • the preheating temperature T (° C.) of the joint in the preheating step is not particularly limited as long as it is more than Tg (° C.) and Tg + 60 (° C.), preferably Tg + 10 (° C.) or more, more preferably Tg + 20 (° C.) or more. Tg + 30 (° C.) or higher is particularly preferable, Tg + 50 (° C.) or lower is preferable, and Tg + 40 (° C.) or lower is more preferable.
  • Tg + 60 (° C.) When the preheating temperature T (° C.) of the joint in the preheating step is higher than Tg (° C.), the joint of the thermoplastic resin film can be prevented from breaking in the oblique stretching step, and Tg + 60 (° C.). When it is below, it is possible to prevent the thermoplastic resin film from becoming too soft and hindering the conveyance of the thermoplastic resin film.
  • the preheating time t (second) of the joint in the preheating step is not particularly limited as long as it is 2 seconds or more, preferably 5 seconds or more, more preferably 7 seconds or more, and preferably 20 seconds or less.
  • the preheating time t (seconds) of the joint in the preheating step is set to 2 seconds or more, the joint of the thermoplastic resin film can be prevented from breaking in the oblique stretching step, and in the preheating step.
  • By setting the preheating time t (second) of the bonded portion to 20 seconds or less, it is possible to prevent the productivity of the obliquely stretched film from being lowered.
  • the preheating temperature T (° C.) of the joint in the preheating step is preferably Tg + 10 (° C.) or more, more preferably Tg + 20 (° C.) or more, and Tg + 60 (° C.) or less. Is preferable, Tg + 50 (° C.) or less is more preferable, and Tg + 40 (° C.) or less is particularly preferable.
  • the preheating time t (second) of the joint in the preheating step is preferably 5 (seconds) or more, more preferably 7 (seconds) or more, and preferably 15 (seconds) or less.
  • the preheating temperature T (° C.) of the joint in the preheating step is preferably more than Tg (° C.), more preferably Tg + 10 (° C.) or more, and Tg + 50 (° C.
  • the preheating time t (second) of the joint in the preheating step is preferably 2 (seconds) or more, preferably 12 (seconds) or less, and more preferably 7 (seconds) or less.
  • an obliquely stretched film can be produced by obliquely stretching the preheated thermoplastic resin film while continuously conveying the thermoplastic resin film.
  • the stretching temperature T ′ (° C.) of the joint in the oblique stretching step is not particularly limited, but is preferably Tg + 3 (° C.) or higher, more preferably Tg + 8 (° C.) or higher, further preferably Tg + 10 (° C.) or higher, and Tg + 30. (° C.) or less is preferable, and Tg + 25 (° C.) or less is more preferable.
  • T ′ (° C.) is within the above range, the molecules contained in the thermoplastic resin film can be stably oriented by oblique stretching, and a desired retardation can be obtained.
  • the stretching temperature T ′ (° C.) may be the same as or different from the preheating temperature T (° C.).
  • the stretching temperature T ′ (° C.) of the joint in the oblique stretching step is preferably Tg + 10 (° C.) or more, more preferably Tg + 15 (° C.) or more, and Tg + 40 (° C. ) Or less is preferable, Tg + 30 (° C.) or less is more preferable, and Tg + 25 (° C.) or less is particularly preferable.
  • the stretching temperature T ′ (° C.) of the joint in the oblique stretching process is preferably more than Tg (° C.), more preferably Tg + 10 (° C.) or more, and Tg + 30. (° C.) or less is preferable, and Tg + 20 (° C.) or less is more preferable.
  • the stretching ratio in the oblique stretching step is not particularly limited, but is preferably 1.1 times or more, more preferably 1.2 times or more, particularly preferably 1.3 times or more, and preferably 3.0 times or less. .5 times or less is more preferable, and 2.0 times or less is particularly preferable.
  • the draw ratio is made 3.0 times or less.
  • the obliquely stretched film has a slow axis in a predetermined range on average in the width direction. Specifically, for example, it has a slow axis in an angle range of 5 ° to 85 ° on average with respect to the width direction.
  • the obliquely stretched film has a slow axis in a predetermined range on average with respect to the width direction, which means that the oblique direction of the obliquely stretched film is in the width direction and the slow phase at a plurality of points in the width direction of the obliquely stretched film. This means that when the angles formed with the axes are measured, the average value of the angles measured at those points falls within the predetermined range.
  • the angle formed by the width direction of the obliquely stretched film and the slow axis may be appropriately referred to as “orientation angle”.
  • the average value of the orientation angle ⁇ is sometimes referred to as “average orientation angle” as appropriate.
  • the average orientation angle ⁇ of the obliquely stretched film is not particularly limited, but is usually 5 ° to 85 °, preferably 40 ° or more, and preferably 50 ° or less. Since the slow axis is expressed by stretching the thermoplastic resin film in an oblique direction, the specific value of the average orientation angle ⁇ can be adjusted by the stretching conditions in the manufacturing method described above. .
  • the average orientation angle ⁇ is an average of the orientation angle values measured at each point by measuring the orientation angle using a phase difference meter at a plurality of points at intervals of 5 cm in the width direction of the obliquely stretched film. It can be obtained by calculating the value.
  • the variation in the orientation angle formed by the width direction of the obliquely stretched film and the slow axis is not particularly limited, but is preferably 1.0 ° or less in the longitudinal direction of the obliquely stretched film, It is more preferably at most 0 °, particularly preferably at most 0.3 °, and ideally 0 °.
  • the variation in the orientation angle represents the difference between the maximum value and the minimum value of the orientation angle of the obliquely stretched film.
  • the mechanical strength of the obliquely stretched film can be increased.
  • the average thickness of the obliquely stretched film can be obtained by measuring the thickness at a plurality of points at intervals of 5 cm in the width direction of the film and calculating the average value of the measured values.
  • the width of the obliquely stretched film is not particularly limited, but is preferably 1000 mm or more, more preferably 1330 mm or more, preferably 1800 mm or less, and more preferably 1600 mm or less.
  • the obliquely stretched film can be applied to a large display device (such as an organic EL display device).
  • the average in-plane retardation Re of the obliquely stretched film is not particularly limited, but is preferably 80 nm or more, more preferably 120 nm or more, particularly preferably 140 nm or more, preferably 300 nm or less, more preferably 200 nm or less, and 150 nm or less. Is particularly preferred.
  • a film cut out from the obliquely stretched film can be suitably used as an optical compensation film of a display device.
  • the average in-plane retardation Re of the obliquely stretched film can be arbitrarily set to an appropriate value.
  • the average in-plane retardation Re is measured at in-plane retardation using a phase difference meter at a plurality of points at intervals of 5 cm in the width direction of the obliquely stretched film. It can be obtained by calculating an average value of retardation values.
  • the variation in in-plane retardation of the obliquely stretched film is not particularly limited, but is preferably 10 nm or less, more preferably 5 nm or less, particularly preferably 2 nm or less, and ideally 0 nm.
  • the dispersion of the in-plane retardation means a difference between the maximum value and the minimum value of the in-plane retardation at an arbitrary point of the obliquely stretched film.
  • FIG. 2 is a diagram schematically showing a configuration example of an oblique stretching machine used for carrying out the method for producing an obliquely stretched film according to the present invention.
  • the oblique stretching machine 60 is a so-called tenter stretching machine, and includes two gripping devices 101L and 101R that grip the end portions of the thermoplastic resin film F1 joined by the heat sealer device 10, respectively.
  • the temperature control chamber 70 is a region that keeps the thermoplastic resin film F1 gripped by the gripping means 110 at an appropriate temperature for oblique stretching.
  • This region includes, for example, a preheating zone X, an oblique stretching zone Y, and a heat fixing zone.
  • the temperature of each zone can be adjusted independently.
  • the preheating temperature T (° C.) and the stretching temperature T ′ (° C.) are the same, the preheating zone X and the oblique stretching zone Y do not have to be separated.
  • a preheating process is performed, and in the oblique stretching zone Y, an oblique stretching process is performed.
  • Each gripping device 101L, 101R includes clips 110L, 110R as a plurality of grips for gripping the end portion of the thermoplastic resin film F1, and endless chains 120L, 120R in which the clips 110L, 110R are installed at predetermined intervals (partly (Not shown), a pair of sprockets 12L, 13L, 12R, and 13R over which endless chains 120L and 120R are spanned, a drive mechanism (not shown) that rotates the sprockets 12L and 12R, and a sprocket 12L that is rotated by the drive mechanism.
  • 12R is provided with a rail (not shown) that guides the direction of the clips 110L and 110R that move with rotation.
  • the rotation speed of the sprocket 12L and the rotation speed of the sprocket 12R are adjusted to be the same. For this reason, the moving speeds of the clips 110L and 110R are the same.
  • the gripping device 101L and the gripping device 101R have substantially the same constituent elements, but differ in the arrangement direction and length of the rail.
  • the direction in which the thermoplastic resin film F1 is supplied and the direction in which the obliquely stretched film F2 after oblique stretching is wound are different, that is, the rails proceed in the directions of arrows D1, D2, and D3.
  • the rail on the gripping device 101L side and the rail on the gripping device 101R side are arranged in parallel at a constant interval on the inlet side (first parallel portion: preheating zone X) to which the film is supplied.
  • the interval is gradually widened, and on the exit side (second parallel portion) of the film, it is parallel with a larger interval than the interval of the first parallel portion. Is arranged.
  • the film is arranged so that the traveling direction of the film bends to the left, but may be arranged to bend to the right.
  • the rail length on the gripping device 101R side that is the outside of the bent portion is longer than the rail length on the gripping device 101L side that is on the inside of the bent portion.
  • the pair of clips that simultaneously grips both ends in the width direction of the thermoplastic resin film F1 have a rail length when passing through the bent portion (obliquely extending zone Y). Since the relative position shifts accordingly, the clip on the gripping device 101L side moves ahead of the clip on the gripping device 101R side in the second parallel portion.
  • thermoplastic resin film F1 is obliquely stretched in an oblique direction that is neither the width direction nor the longitudinal direction, and the molecular orientation direction becomes the oblique direction.
  • the obliquely stretched film F2 can be manufactured.
  • thermoplastic resin film F1 When the thermoplastic resin film F1 is supplied to such an oblique stretching machine 60, the thermoplastic resin film F1 is continuously supplied from the upstream (upper left in FIG. 2) to the oblique stretching machine 60 along the direction of the arrow D1.
  • the supplied thermoplastic resin film F1 is gripped by a pair of clips 110L and 110R at both ends in the width direction before entering the temperature control chamber 70.
  • the thermoplastic resin film F1 gripped by the clips 110L and 110R enters the temperature control chamber 70, and in the temperature control chamber 70, by the circular movement along the rail on each side of each clip 110L and 110R, Stretched in the direction.
  • the obliquely stretched film F2 stretched in the oblique direction is released from the temperature control chamber 70 and then released from being gripped by the clips 110L and 110R, and is carried out in the direction of the arrow D3.
  • both end portions in the width direction of the thermoplastic resin film F1 are simultaneously grasped at the time of the dotted line CS1, and are carried into the temperature control chamber 70 to start the preheating process.
  • the oblique stretching process is started from the position where the rail interval starts to widen, and when the position reaches, for example, the dotted line CS2, the film is stretched in the direction of the dotted line CS2.
  • the oblique stretching process is terminated at a position where the rail spacing becomes the same again. Therefore, the conveyance time from the position where the temperature is adjusted into the temperature control chamber 70 to the position where the rail interval begins to increase becomes the preheating time t.
  • the manufacturing method of the polarizing plate of this invention is a method of manufacturing a polarizing plate by laminating
  • the polarizing plate includes an obliquely stretched film manufactured by the above-described method for manufacturing an obliquely stretched film and a polarizer, and may further include an arbitrary member as necessary.
  • the polarizing plate can be manufactured by laminating a long polarizer and a long obliquely stretched film by roll-to-roll with the longitudinal direction thereof being parallel. In bonding, an adhesive may be used as necessary. By producing using a long film, it is possible to efficiently produce a long polarizing plate.
  • the polarizer examples include, for example, a film of a suitable vinyl alcohol polymer such as polyvinyl alcohol and partially formalized polyvinyl alcohol, a dyeing process using an dichroic substance such as iodine and a dichroic dye, a stretching process, and a crosslinking process. And the like, which have been subjected to appropriate processing in an appropriate order and manner.
  • a polarizer is capable of transmitting linearly polarized light when natural light is incident thereon, and in particular, a polarizer excellent in light transmittance and degree of polarization is preferable.
  • the thickness of the polarizer is generally 5 ⁇ m or more and 80 ⁇ m or less, but is not limited thereto.
  • the obliquely stretched film may be provided on both sides of the polarizer or on one side.
  • a protective film has been provided on the surface of the polarizer.
  • the obliquely stretched film can serve as the protective film for the polarizer. Therefore, the polarizing plate provided with the obliquely stretched film and the polarizer in combination can omit the conventionally used protective film and can contribute to thinning.
  • the protective film for protecting a polarizer is mentioned, for example. Any transparent film can be used as the protective film. Among these, a resin film excellent in transparency, mechanical strength, thermal stability, moisture shielding properties and the like is preferable.
  • the manufacturing method of the liquid crystal display device of this invention is a method of manufacturing a liquid crystal display device using the polarizing plate mentioned above.
  • the liquid crystal display device can be manufactured, for example, by using what is cut out to a predetermined size from the polarizing plate.
  • Examples of the liquid crystal display device include those having liquid crystal cells of various driving methods.
  • Liquid crystal cell driving methods include, for example, in-plane switching (IPS) mode, vertical alignment (VA) mode, multi-domain vertical alignment (MVA) mode, continuous spin wheel alignment (CPA) mode, and hybrid alignment nematic (HAN) Mode, twisted nematic (TN) mode, super twisted nematic (STN) mode, optical compensated bend (OCB) mode, and the like.
  • thermoplastic resin film- Using a snap gauge (“ID-C112BS” manufactured by Mitutoyo Corporation), the thickness was measured at a plurality of points at intervals of 5 cm in the width direction of the thermoplastic resin film. By calculating the average value of these measured values, the average thickness of the thermoplastic resin film was determined. In addition, the thermoplastic resin film conveyed ahead is made into sheet A, and the thermoplastic resin film conveyed behind is made into sheet B.
  • thermoplastic resin film was calculated from the conveyance speed of the thermoplastic resin film and the conveyance distance of the thermoplastic resin film in the preheating zone X.
  • thermoplastic resin film in the preheating zone X conveyed to the oblique stretching machine (tenter stretching machine) 60 of FIG. 2 was measured as follows.
  • the temperature of the space with a distance of 100 mm in the film normal direction from the joint of the thermoplastic resin film in the preheating zone X is measured using a thermocouple, and this is adopted as the preheating temperature T (° C.) of the thermoplastic resin film. did.
  • thermoplastic resin film in the oblique stretching zone Y conveyed to the oblique stretching machine 60 in FIG. 2 was measured as follows.
  • the temperature of the space at a distance of 100 mm in the film normal direction from the joint of the thermoplastic resin film in the oblique stretching zone Y was measured using a thermocouple, and this was measured as the stretching temperature T ′ (° C.) of the thermoplastic resin film. Adopted as.
  • Example 1 A norbornene resin pellet (“ZEONOR” manufactured by Nippon Zeon Co., Ltd., glass transition temperature Tg 126 ° C.) is molded with a T-die type film extruder to produce a long norbornene resin film having a width of 1200 mm and a thickness of 120 ⁇ m. Rolled up into a roll. In this way, two norbornene resin films wound up in a roll shape are prepared, and using a heat sealer, the norbornene resin film (sheet A) transported in advance and the norbornene resin transported downstream. The film (sheet B) was bonded by heat fusion.
  • ZONOR glass transition temperature manufactured by Nippon Zeon Co., Ltd., glass transition temperature Tg 126 ° C.
  • an oblique stretching machine 60 having the configuration described in the above-described embodiment is prepared, and a norbornene resin film bonded to the oblique stretching machine 60 by the thermal fusion is used as a thermoplastic resin.
  • the film F1 was supplied from the heat sealer device 10.
  • the thermoplastic resin film F1 was preheated or obliquely stretched under the conditions shown in the column of Example 1 in Table 1 below to produce an obliquely stretched film F2.
  • the obliquely stretched film F2 thus obtained was evaluated for breakage, average in-plane retardation Re, and average orientation angle ⁇ by the methods described above. The obtained evaluation results are shown in Table 1.
  • Example 2 In Example 1, instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column of Example 1 in Table 1 below, the thermoplastic resin film F1 under the conditions shown in the column of Example 2 in Table 1 below. Except having been preheated or obliquely stretched, the obliquely stretched film F2 was produced in the same manner as in Example 1, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 3 In Example 1, instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column of Example 1 in Table 1 below, the thermoplastic resin film F1 under the conditions shown in the column of Example 3 in Table 1 below. Except having been preheated or obliquely stretched, the obliquely stretched film F2 was produced in the same manner as in Example 1, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 4 In Example 1, instead of producing a long norbornene resin film having a thickness of 120 ⁇ m, a long norbornene resin film having a thickness of 70 ⁇ m was produced. In Example 1, Example 1 in Table 1 below was used. Instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column, Example 1 except that the thermoplastic resin film F1 was preheated or obliquely stretched under the conditions shown in the column of Example 4 in Table 1 below. In the same manner as described above, an obliquely stretched film F2 was produced, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 5 (Example 5) In Example 4, instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column of Example 4 in Table 1 below, the thermoplastic resin film F1 under the conditions shown in the column of Example 5 in Table 1 below. Except having been preheated or obliquely stretched, the obliquely stretched film F2 was produced in the same manner as in Example 4, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 6 In Example 1, instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column of Example 1 of Table 1 below, the thermoplastic resin film F1 under the conditions shown in the column of Example 6 of Table 1 below.
  • the slanted stretched film F2 was produced in the same manner as in Example 1 except that the slanted stretched film F2 was produced by preheating or obliquely stretching the film, and the obtained slanted stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 7 In Example 6, instead of thermally bonding the norbornene resin film transported in advance and the norbornene resin film transported in the following, the norbornene resin film transported in advance, the norbornene resin film transported in advance, The obliquely stretched film F2 was produced in the same manner as in Example 6 except that the norbornene resin film conveyed in line was tape-joined, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 8 In Example 2, the norbornene resin pellet (“ZEONOR” manufactured by Nippon Zeon Co., Ltd., glass transition temperature Tg 126 ° C.) was changed to another norbornene resin pellet (“ZEONOR manufactured by Nippon Zeon Co., Ltd., glass transition temperature Tg 163 ° C.)”. Except having done, it carried out similarly to Example 2, manufactured the diagonally stretched film F2, and evaluated about the obtained diagonally stretched film F2. The obtained evaluation results are shown in Table 1.
  • Example 1 (Comparative Example 1) In Example 1, instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column of Example 1 in Table 1 below, the thermoplastic resin film F1 under the conditions shown in the column of Comparative Example 1 in Table 1 below. Except having been preheated or obliquely stretched, the obliquely stretched film F2 was produced in the same manner as in Example 1, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 2 (Comparative Example 2) In Example 1, instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column of Example 1 in Table 1 below, the thermoplastic resin film F1 under the conditions shown in the column of Comparative Example 2 in Table 1 below. Except having been preheated or obliquely stretched, the obliquely stretched film F2 was produced in the same manner as in Example 1, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 4 (Comparative Example 3) In Example 4, instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column of Example 4 in Table 1 below, the thermoplastic resin film F1 under the conditions shown in the column of Comparative Example 3 in Table 1 below. Except that was preheated or obliquely stretched, the obliquely stretched film F2 was produced in the same manner as in Example 4, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Example 7 (Comparative Example 4) In Example 7, instead of preheating or obliquely stretching the thermoplastic resin film F1 under the conditions shown in the column of Example 7 in Table 1 below, the thermoplastic resin film F1 under the conditions shown in the column of Comparative Example 4 in Table 1 below. Except that was preheated or obliquely stretched, the obliquely stretched film F2 was produced in the same manner as in Example 7, and the obtained obliquely stretched film F2 was evaluated. The obtained evaluation results are shown in Table 1.
  • Comparative Example 5 (Comparative Example 5) In Comparative Example 2, the norbornene resin pellet (“ZEONOR” manufactured by Nippon Zeon Co., Ltd., glass transition temperature Tg 126 ° C.) was changed to another norbornene resin pellet (“ZEONOR manufactured by Nippon Zeon Co., Ltd., glass transition temperature Tg 163 ° C.)”. Except having done, it carried out similarly to the comparative example 2, and manufactured the diagonally stretched film F2, and evaluated about the obtained diagonally stretched film F2. The obtained evaluation results are shown in Table 1.
  • thermoplasticity in the oblique stretching step It was possible to continuously manufacture obliquely stretched films while suppressing breakage of the joint portion of the resin film.
  • the joining means is heat fusion
  • Example 7 the joining means is a tape
  • the joint portion of the thermoplastic resin film is further prevented from breaking in the oblique stretching step. The obliquely stretched film could be continuously produced more reliably.
  • Comparative Examples 1 and 4 in which the preheating time t in the preheating process was as short as 1.7 seconds, it was not possible to suppress the breakage of the joint portion of the thermoplastic resin film in the oblique stretching process.
  • Comparative Examples 2, 3, and 5 in which the preheating temperature T is the glass transition temperature Tg of the norbornene resin, it was not possible to suppress the breakage of the joint portion of the thermoplastic resin film in the oblique stretching process.

Abstract

L'invention concerne un procédé de production d'un film étiré obliquement, dans lequel la rupture dans la partie de liaison de films en résine thermoplastique dans une étape d'étirage oblique est minimale et des films étirés obliquement peuvent être produits en continu. Selon l'invention, un procédé de production d'un film étiré obliquement comprend une étape de liaison, dans laquelle un film en résine thermoplastique transporté en premier et un film en résine thermoplastique transporté par la suite sont reliés avec une partie de liaison interposée entre eux, une étape de préchauffage, dans laquelle les films en résine thermoplastique reliés avec la partie de liaison interposée entre eux sont préchauffés tout en étant transportés en continu, et une étape d'étirage oblique, dans laquelle les films en résine thermoplastique préchauffés sont étirés obliquement tout en étant transportés en continu, le film en résine thermoplastique transporté en premier et le film en résine thermoplastique transporté par la suite étant des films en résine thermoplastique identiques et les formules (1) et (2) ci-dessous étant respectées, où T (°C) est la température de préchauffage de la partie de liaison dans l'étape de préchauffage, t (secondes) est le temps de préchauffage de la partie de liaison dans l'étape de préchauffage et Tg (°C) est la température de transition vitreuse de la résine thermoplastique dans le film en résine thermoplastique. Tg < T ≤ Tg + 60 (1) 2≤ t (2)
PCT/JP2018/001820 2017-01-31 2018-01-22 Procédé de production d'un film étiré obliquement, procédé de production d'une plaque de polarisation et procédé de production d'un dispositif d'affichage à cristaux liquides WO2018142991A1 (fr)

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JP2011245624A (ja) * 2010-05-21 2011-12-08 Kaneka Corp 光学用フィルムの製造方法
WO2012053218A1 (fr) * 2010-10-21 2012-04-26 コニカミノルタオプト株式会社 PROCÉDÉ DE PRODUCTION DE PELLICULE POLYMÈRE LONGUE, PELLICULE POLYMÈRE, PLAQUE λ/4, PLAQUE POLARISANTE ET DISPOSITIF D'AFFICHAGE À CRISTAUX LIQUIDES
WO2015064645A1 (fr) * 2013-10-30 2015-05-07 日本ゼオン株式会社 Film étiré long et son procédé de production

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JP2011245624A (ja) * 2010-05-21 2011-12-08 Kaneka Corp 光学用フィルムの製造方法
WO2012053218A1 (fr) * 2010-10-21 2012-04-26 コニカミノルタオプト株式会社 PROCÉDÉ DE PRODUCTION DE PELLICULE POLYMÈRE LONGUE, PELLICULE POLYMÈRE, PLAQUE λ/4, PLAQUE POLARISANTE ET DISPOSITIF D'AFFICHAGE À CRISTAUX LIQUIDES
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