WO2019131175A1 - Film d'annulation de polarisation et corps stratifié - Google Patents

Film d'annulation de polarisation et corps stratifié Download PDF

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Publication number
WO2019131175A1
WO2019131175A1 PCT/JP2018/045886 JP2018045886W WO2019131175A1 WO 2019131175 A1 WO2019131175 A1 WO 2019131175A1 JP 2018045886 W JP2018045886 W JP 2018045886W WO 2019131175 A1 WO2019131175 A1 WO 2019131175A1
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Prior art keywords
liquid crystal
crystal compound
film
depolarizing film
optical axis
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PCT/JP2018/045886
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English (en)
Japanese (ja)
Inventor
二村　恵朗
寛 稲田
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富士フイルム株式会社
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Priority to JP2019562977A priority Critical patent/JP6836666B2/ja
Publication of WO2019131175A1 publication Critical patent/WO2019131175A1/fr

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    • 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 depolarizing film and a laminate using the depolarizing film.
  • the mirror with an image display function which enabled the display of the picture etc. which were photoed with the in-vehicle camera is known.
  • a configuration is known in which a liquid crystal display device is provided inside a housing of a vehicle mirror, and an image is displayed by the vehicle mirror by displaying an image through a half mirror provided on the entire surface of the vehicle mirror. ing.
  • tempered glass used for a window glass of a vehicle particularly, a rear glass (rear window) has a lattice-like distribution of retardation (birefringence distribution).
  • Tempered glass is generally produced by heating float plate glass to 700 ° C. near the softening point and then blowing air onto the glass surface for quenching. By this treatment, the temperature of the glass surface first drops and shrinks and solidifies, but the temperature inside the glass is slower than the surface and the shrinkage is delayed. As a result, a stress distribution occurs inside the glass, and a lattice-like phase difference distribution occurs in the tempered glass.
  • Such a problem can be eliminated, for example, by sticking a depolarizing film on a vehicle mirror.
  • the depolarizing film which has high transparency (the haze is 15% or less)
  • the depolarizing film described, for example in patent document 1 is known.
  • This depolarizing film is a layer made of a liquid crystal compound and laminated on one surface of a transparent resin film and a transparent resin film, and has a function of converting linearly polarized light into partially polarized light or non-polarized light, And.
  • the object of the present invention is to solve such problems of the prior art, and to provide a depolarizing film having high transparency in addition to sufficient depolarizing performance, and a laminate using this depolarizing film. It is to do.
  • the present invention has the following configuration.
  • [1] having a liquid crystal compound twisted and oriented along a helical axis extending along the thickness direction,
  • the twist angle of the liquid crystal compound having a twist orientation is 0 ° or more and less than 360 °, and the liquid crystal compound having a twist orientation has a plurality of regions having different twist angles, and
  • the direction of the optical axis derived from the liquid crystal compound is between the magnitude from the maximum value to the minimum value and the magnitude from the minimum value to the maximum value of the twist angle of the liquid crystal compound oriented in torsion.
  • Depolarization film characterized by continuously changing.
  • a laminate comprising the depolarizing film according to any one of [1] to [9] and a substrate.
  • the depolarization film of the present invention has high transparency in addition to sufficient depolarization performance. Moreover, the laminate of the present invention using this depolarizing film can prevent the deterioration of visibility due to polarized light and the like.
  • FIG. 1 is a view conceptually showing an example of the depolarizing film of the present invention.
  • FIG. 2 is a view conceptually showing the lower surface of the depolarizing film shown in FIG.
  • FIG. 3 is a view conceptually showing the upper surface of the depolarizing film shown in FIG.
  • FIG. 4 is a conceptual view for explaining the method for producing a depolarizing film of the present invention.
  • FIG. 5 is a conceptual view for explaining the method for producing a depolarizing film of the present invention.
  • a numerical range represented using “to” means a range including the numerical values described before and after “to” as the lower limit value and the upper limit value.
  • (meth) acrylate is used in the meaning of “either or both of acrylate and methacrylate”.
  • the depolarizing film 10 of the present invention has the liquid crystal compound 12 twisted and oriented along a helical axis extending along the thickness direction.
  • the thickness direction is the vertical direction in FIG.
  • the twist angle of the liquid crystal compound 12 subjected to twist alignment is 0 ° or more and less than 360 °, and has a plurality of regions in which the twist angle of the liquid crystal compound 12 is different.
  • the direction of the optical axis derived from the liquid crystal compound 12 continuously changes on at least one surface.
  • FIG. 2 conceptually shows the arrangement of the liquid crystal compound 12 on the lower surface side of the depolarizing film 10 in FIG. 1 and the arrangement of the liquid crystal compound 12 on the upper surface side of the depolarizing film 10 in FIG. That is, FIG. 2 shows a plan view of the depolarizing film 10 as viewed from the lower side in FIG. 1, and FIG. 3 shows the depolarizing film 10 as viewed from the upper side in FIG. Shows a top view.
  • the liquid crystal compound 12 is a rod-like liquid crystal compound, and the direction of the optical axis derived from the liquid crystal compound coincides with the longitudinal direction of the liquid crystal compound 12.
  • the lower surface side of the depolarizing film 10 in FIG. 1 is simply referred to as the lower surface, and the upper surface side of the depolarizing film 10 in FIG.
  • the liquid crystal compounds 12 are two-dimensionally arranged in the X direction in the figure and in the Y direction orthogonal to the X direction. As shown in FIGS. 1 and 2, on the lower surface of the depolarizing film 10, all the liquid crystal compounds 12 are arranged with the optical axis derived from the liquid crystal compound in the X direction. On the other hand, as shown in FIG. 1 and FIG. 3, on the upper surface of the depolarizing film 10, the liquid crystal compound 12 has regions in which the directions of the optical axes derived from the liquid crystal compound differ in each row in the X direction.
  • the depolarization film 10 has regions in which the twist angles of the liquid crystal compound 12 differ in the twist alignment along the helical axis extending along the thickness direction. Further, as shown in FIG. 1 and FIG. 3, in the liquid crystal compounds 12 arranged in each row in the X direction, that is, in the Y direction, the directions of the optical axes derived from the liquid crystal compound are equal. That is, in the depolarizing film 10, the liquid crystal compounds 12 aligned in the Y direction have equal twist angles of the liquid crystal compound 12 in the twist alignment along the helical axis extending along the thickness direction. In FIG. 1, the Y direction is a direction orthogonal to the paper surface.
  • the liquid crystal compound 12 is twisted 180 ° along the helical axis extending along the thickness direction from the state where the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface, On the upper surface, the optical axis derived from the liquid crystal compound coincides with the X direction. Therefore, the twist angle of the liquid crystal compound 12 is 180 °.
  • the liquid crystal compound 12 is twisted by 150 ° along the helical axis extending along the thickness direction from the state where the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface, and the liquid crystal compound 12 is derived from the upper surface
  • the optical axis of is inclined by 30.degree.
  • the twist angle of the liquid crystal compound 12 is 150 °.
  • the liquid crystal compound 12 is twisted by 120 ° along the helical axis extending along the thickness direction from the state where the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface, and the liquid crystal compound 12 is derived from the upper surface
  • the optical axis of is inclined 60.degree.
  • the twist angle of the liquid crystal compound 12 is 120 °.
  • the liquid crystal compound 12 is twisted at 90 ° along the helical axis extending along the thickness direction from the state where the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface,
  • the optical axis of is inclined 90.degree. With respect to the X direction. Therefore, the twist angle of the liquid crystal compound 12 is 90 °.
  • the liquid crystal compound 12 is twisted at 60 ° along the helical axis extending along the thickness direction from the state where the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface,
  • the optical axis of is inclined 120 ° with respect to the X direction.
  • the twist angle of the liquid crystal compound 12 is 60 °.
  • the liquid crystal compound 12 is twisted by 30 ° along the helical axis extending along the thickness direction from the state where the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface, and the liquid crystal compound 12 is derived from the upper surface
  • the optical axis of is inclined by 150.degree. With respect to the X direction. Therefore, the twist angle of the liquid crystal compound 12 is 30 °.
  • the liquid crystal compound 12 is not twist-oriented, and the optical axis derived from the liquid crystal compound coincides with the X direction on the upper surface while the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface side There is. Therefore, the twist angle of the liquid crystal compound 12 is 0 °.
  • the liquid crystal compound 12 is twisted by 30 ° along the helical axis extending along the thickness direction from the state where the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface, At the top surface, the optical axis derived from the liquid crystal compound is in a state of being inclined by 150 ° with respect to the X direction. Therefore, the twist angle of the liquid crystal compound 12 is 30 °.
  • the liquid crystal compound 12 is twisted by 60 ° along the helical axis extending along the thickness direction from the state where the optical axis derived from the liquid crystal compound coincides with the X direction on the lower surface, At the top surface, the optical axis derived from the liquid crystal compound is in a state of being inclined by 120 ° with respect to the X direction. Therefore, the twist angle of the liquid crystal compound 12 is 60 °.
  • the twist angle of the liquid crystal compound 12 decreases from the maximum of 180 ° to become the minimum 0 ° between the x1 row to the x7 row, and the liquid crystal compound proceeds from the x7 row to the x9 row.
  • the twist angle of 12 gradually increases from the smallest 0 °.
  • the rotation direction of the optical axis derived from the liquid crystal compound is counterclockwise from x1 row to x7 row, the rotation direction of the optical axis derived from the liquid crystal compound is reversed from x7 row onward, and the liquid crystal compound The rotation direction of the optical axis of origin is clockwise.
  • the twist angle of the liquid crystal compound 12 gradually increases in the x direction from the x8 row onwards to the right in the X direction, and reaches a maximum of 180 °.
  • the twist angle gradually decreases from the maximum 180 ° to the minimum 0 °, and then the twist angle of the liquid crystal compound 12 gradually increases from the minimum 0 ° to the maximum 180 °. ,repeat.
  • the direction of rotation (direction of change) is clockwise, and the direction of rotation of the optical axis derived from the liquid crystal compound on the top surface of the depolarizing film 10 is reversed after the twist angle of the liquid crystal compound 12 reaches 180 ° at maximum.
  • the twist angle of the liquid crystal compound 12 becomes 0 ° at the minimum
  • the twist angle of the liquid crystal compound 12 becomes 0 ° at the minimum
  • the liquid crystal compound-derived material on the upper surface of the depolarizing film 10 It is repeated that the direction of rotation of the optical axis is reversed and clockwise until the twist angle of the liquid crystal compound 12 reaches 180 ° at the maximum.
  • linearly polarized light in the X direction is incident from the lower surface side of the depolarizing film 10 in which the liquid crystal compound 12 is twisted and oriented
  • linearly polarized light incident on the region of the x1 row is rotated 180 ° and linearly polarized in the X direction It is emitted from the top side. Therefore, in this region, the optical rotation angle is 180 °.
  • the linearly polarized light in the X direction incident on the region of the x2 row is rotated by 150 ° and emitted from the upper surface side as linearly polarized light inclined 30 ° with respect to the X direction. Therefore, in this region, the optical rotation angle is 150 °.
  • Linearly polarized light in the X direction incident on the region of the x3 line is rotated by 120 ° and emitted from the upper surface side as linearly polarized light inclined at 60 ° with respect to the X direction. Therefore, in this region, the optical rotation angle is 120 °.
  • the linearly polarized light in the X direction incident on the region of the x4 line is rotated 90 ° and emitted from the upper surface side as linearly polarized light inclined 90 ° with respect to the X direction. Therefore, in this region, the optical rotation angle is 90 °.
  • Linearly polarized light in the X direction that has entered the region of x5 rows is rotated by 60 ° and emitted from the upper surface side as linearly polarized light that is tilted by 120 ° with respect to the X direction. Therefore, in this region, the optical rotation angle is 60 °.
  • the linearly polarized light in the X direction incident on the region of the x6 array is rotated by 30 ° and emitted from the upper surface side as linearly polarized light inclined by 150 ° with respect to the X direction. Therefore, in this region, the optical rotation angle is 30 °.
  • Linearly polarized light in the X direction that has entered the region of x7 rows is emitted from the upper surface side as linearly polarized light in the X direction without being rotated at all. Therefore, in this region, the optical rotation angle is 0 °.
  • Linearly polarized light in the X direction that has entered the region of x8 rows is rotated by 30 ° and emitted from the upper surface side as linearly polarized light that is inclined 150 ° with respect to the X direction. Therefore, in this region, the optical rotation angle is 30 °.
  • Linearly polarized light in the X direction incident on the region of the x9 array is rotated by 60 ° and emitted from the upper surface side as linearly polarized light tilted by 120 ° with respect to the X direction. Therefore, in this region, the optical rotation angle is 60 °.
  • linearly polarized light that has entered the depolarizing film 10 is rotated at different rotation angles depending on the region where it is entered, and is emitted as linearly polarized light in various directions.
  • various polarizations are mixed as a whole, and the polarization is depolarized.
  • the liquid crystal compound is twisted liquid crystal compound while the size of the twist angle of the liquid crystal compound is from the maximum value to the minimum value and from the minimum value to the maximum value.
  • the direction of the optical axis of origin is continuously changing.
  • the magnitude of the twist angle of the liquid crystal compound twisted and oriented in the direction in which the direction of the optical axis derived from the liquid crystal compound continuously changes on at least one surface (from the maximum value to the minimum value)
  • the area having the value and the area having the minimum value to the maximum value are alternately provided.
  • the direction of the optical axis derived from the liquid crystal compound is continuously changing (the right direction in the X direction), and the direction of the optical axis derived from the liquid crystal compound is counterclockwise It has alternating areas of rotation and areas of clockwise rotation.
  • the depolarization film 10 has a small difference in the twist angle of the liquid crystal compound in a twisted orientation in the adjacent region, and as a result, there is no interface that causes haze in the plane, and the haze is high and the transparency is high. That is, the depolarizing film 10 of the present invention is a depolarizing film having not only excellent depolarization performance but also high transparency.
  • that the direction of the optical axis derived from the liquid crystal compound changes continuously on the surface means that the change in the direction of the optical axis derived from the liquid crystal compound on the surface is a constant direction. It means that the rotation direction of the optical axis of origin does not reverse rotate in one direction.
  • the twist angle of the liquid crystal compound 12 in a twisted orientation is 0 ° or more and less than 360 °.
  • the twist angle of the twist-oriented liquid crystal compound 12 is 0 to 180 °. That is, in the depolarizing film 10 of the present invention, the maximum value of the twist angle of the twist-oriented liquid crystal compound 12 is less than 360 °, and preferably 180 ° or less.
  • the twist angle of the liquid crystal compound 12 is 360 ° or more, the depolarizing film becomes uselessly thick, resulting in disadvantages such as being disadvantageous in transparency.
  • the maximum value of the twist angle of the liquid crystal compound 12 subjected to twist alignment is preferably 45 ° or more, and more preferably 90 ° or more. Further, in the depolarization film 10 of the present invention, there is no limitation on the minimum value of the twist angle of the liquid crystal compound 12 which is twisted and oriented. 45 degrees or less are preferable and, as for the minimum value of the twist angle of the liquid crystal compound 12 which carried out the twist orientation, 10 degrees or less are more preferable.
  • the twist angle of the liquid crystal compound 12 which is twisted and oriented refers to the lower surface and the upper surface of the liquid crystal compound 12 which is twisted and oriented along the helical axis extending along the thickness direction in the depolarizing film 10. Twisting angle until
  • the amount of change in the twist angle of the liquid crystal compound 12, that is, the change in the optical rotation angle of the incident light is 30 ° in the direction in which the twist angle of the liquid crystal compound 12 is twisted.
  • the present invention is not limited thereto. That is, in the depolarizing film of the present invention, the amount of change in the twist angle, that is, the amount of change in the optical rotation angle of the incident light in the direction in which the twist angle of the liquid crystal compound 12 oriented in twist changes (arrow X direction) It may be uniform. At this time, the amount of change of the twist angle may be increasing, decreasing, or irregular from the maximum twist angle to the minimum twist angle.
  • the maximum twist angle is 180 ° and the minimum twist angle is 0 °.
  • the difference between the twist angles of the liquid crystal compounds in the x1 and x2 rows is 10 °
  • the difference between the twist angles of the liquid crystal compounds between the x2 and x3 rows is 15 °
  • the difference of the twist angle of the liquid crystal compound with the x4 row may be 20 °
  • the difference of the twist angle of the liquid crystal compound between the x4 row and the x5 row may be gradually increased as 25 °,.
  • the difference in the twist angle of the liquid crystal compound in the x1 and x2 rows is 30 °, and the difference in the twist angle of the liquid crystal compound between the x2 and x3 rows is 15 °, the liquid crystal in the x3 and x4 rows
  • the difference in the twist angle of the compound may be irregularly changed as 20 °, and the difference in the twist angle of the liquid crystal compound between the x4 and x5 rows is 10 °, and so on.
  • Such a twist angle change of the liquid crystal compound 12 with twisted orientation is, for example, to adjustment of the width of the light shielding portion and the light transmitting portion of the mask, density adjustment of the light shielding portion, and light shielding portion in the manufacturing method of the present invention described later. It can be controlled by the application of the concentration change of
  • the direction of the optical axis derived from the liquid crystal compound 12 is continuously rotated in the X direction on the upper surface, but the direction of the optical axis derived from the liquid crystal compound 12 is all on the lower surface It is one direction (X direction).
  • the control of the twist angle of the liquid crystal compound 12 can be performed with high accuracy, and a highly transparent depolarizing film capable of facilitating alignment processing for aligning the liquid crystal compound 12 is obtained.
  • the depolarizing film of the present invention is not limited thereto, and the direction of the optical axis derived from the liquid crystal compound 12 may be continuously changed on both sides, or on one side, the liquid crystal compound 12 may be used.
  • the direction of the optical axis from which it originates may change discontinuously.
  • the continuous change in the direction of the optical axis derived from the liquid crystal compound 12, ie, the direction in which the twist angle (rotational rotation angle) of the twisted liquid crystal compound 12 changes is the X direction.
  • the optical axis derived from the liquid crystal compound 12 does not change in the Y direction.
  • the present invention is not limited to this, and the change in the direction of the optical axis derived from the liquid crystal compound 12, ie, the change in the twist angle of the twist-oriented liquid crystal compound 12 is in both the X and Y directions. It may change towards the end.
  • the depolarizing film 10 of the present invention is manufactured by so-called roll-to-roll, which carries out various processes while conveying a long support in the longitudinal direction. Is preferred.
  • the continuous change in the direction of the optical axis derived from the liquid crystal compound 12 is made only in one direction, so that roll-to-roll production is easy and easy. It is possible to respond suitably and is preferable.
  • the liquid crystal compound 12 in twisted alignment in the direction in which the twist angle of the liquid crystal compound 12 in twisted alignment changes, that is, in the direction in which the direction of the optical axis derived from the liquid crystal compound 12 changes, the liquid crystal compound 12 in twisted alignment is The distance at which the twist angle is from the maximum value to the minimum value (minimum to maximum value) is taken as one pitch P. That is, in the depolarizing film 10 shown in FIGS.
  • the twist angle of the liquid crystal compound 12 which is twisted and oriented is 180 ° at the maximum, and the direction of the optical axis derived from the liquid crystal compound 12 on the upper surface coincides with the X direction
  • One pitch P is up to the center of twelve.
  • the length of one pitch P is not limited.
  • the length of one pitch P is preferably 0.4 to 100 ⁇ m, more preferably 0.7 to 100 ⁇ m, and still more preferably 1 to 10 ⁇ m.
  • the length of one pitch P can be controlled, for example, by adjusting the widths of the light shielding portion and the light transmitting portion of the mask in the manufacturing method of the present invention described later.
  • the depolarizing film 10 of the present invention since the depolarizing film 10 of the present invention has no interface in the plane, the haze is low and the transparency is high.
  • the depolarizing film 10 of the present invention preferably has a haze of 5% or less, more preferably 3% or less, and still more preferably 1% or less.
  • the lower limit is not particularly limited but includes 0%.
  • the thickness of the depolarizing film 10 is not particularly limited, and along the thickness direction according to the type of liquid crystal compound forming the depolarizing film 10, the component to be added to the depolarizing film 10 such as a chiral agent, etc.
  • the thickness that can realize the maximum twist angle of the liquid crystal compound twisted and oriented along the helical axis that extends can be set as appropriate.
  • the thickness of the depolarizing film 10 is preferably 1 to 100 ⁇ m, and more preferably 1 to 50 ⁇ m.
  • the depolarizing film 10 is, for example, in a state in which the polymerizable liquid crystal compound is twisted and oriented along the helical axis extending along the thickness direction, and then polymerized and cured by ultraviolet irradiation, heating, etc. Without forming a layer, it is simultaneously made to change into a state in which no change in orientation is caused by external field or external force. In the structure in which the twist alignment is fixed, it is sufficient if the optical property of the twist alignment is maintained, and in the depolarizing film 10, the liquid crystal compound 12 may not exhibit liquid crystallinity.
  • the polymerizable liquid crystal compound may have a high molecular weight by the curing reaction to lose liquid crystallinity.
  • the liquid-crystal composition containing a liquid crystal compound is mentioned as an example.
  • the liquid crystal compound is preferably a polymerizable liquid crystal compound.
  • the liquid crystal composition used to form the depolarizing film 10 preferably further contains a chiral agent, and may further contain a surfactant (horizontal alignment agent).
  • the polymerizable liquid crystal compound may be a rod-like liquid crystal compound or a discotic liquid crystal compound, but is preferably a rod-like liquid crystal compound.
  • Examples of rod-like polymerizable liquid crystal compounds that form the depolarizing film 10 include rod-like nematic liquid crystal compounds.
  • the polymerizable liquid crystal compound is obtained by introducing a polymerizable group into the liquid crystal compound.
  • the polymerizable group include an unsaturated polymerizable group, an epoxy group, and an aziridinyl group, and the unsaturated polymerizable group is preferable, and the ethylenically unsaturated polymerizable group is more preferable.
  • the polymerizable group can be introduced into the molecules of the liquid crystal compound by various methods.
  • the number of polymerizable groups contained in the polymerizable liquid crystal compound is preferably 1 to 6, and more preferably 1 to 3.
  • An example of the polymerizable liquid crystal compound is Makromol. Chem. 190, 2255 (1989), Advanced Materials 5: 107 (1993), U.S. Pat. No.
  • cyclic organopolysiloxane compounds having a cholesteric phase as disclosed in JP-A-57-165480 can be used.
  • a polymer in which a mesogenic group exhibiting liquid crystal is introduced into the main chain, a side chain, or both the main chain and the side chain a polymer cholesteric in which a cholesteryl group is introduced into a side chain A liquid crystal, a liquid crystalline polymer as disclosed in JP-A-9-133810, and a liquid crystalline polymer as disclosed in JP-A-11-293252 can be used.
  • the addition amount of the polymerizable liquid crystal compound in the liquid crystal composition is preferably 75 to 99.9% by mass with respect to the mass of the solid content (mass excluding the solvent) of the liquid crystal composition, and 80 to 99 It is more preferable that the amount is% by mass, and further preferably 85 to 90% by mass.
  • the liquid crystal composition used when forming the depolarizing film 10 may contain a surfactant.
  • the surfactant is preferably a compound capable of functioning as an alignment control agent (horizontal alignment agent) that contributes to the effect of stably or rapidly setting the liquid crystal compound to planar alignment.
  • Examples of the surfactant include silicone surfactants and fluorosurfactants, and fluorosurfactants are preferably exemplified.
  • the surfactant include compounds described in paragraphs [0082] to [0090] of JP-A-2014-119605, and compounds described in paragraphs [0031] to [0034] of JP-A-2012-203237.
  • the fluorine (meth) acrylate-based polymers described in paragraphs [0018] to [0043] and the like of JP-A-2007-272185, and the like.
  • surfactant may be used individually by 1 type, and may use 2 or more types together.
  • fluorine-based surfactant compounds described in paragraphs [0082] to [0090] of JP-A-2014-119605 are preferable.
  • the addition amount of the surfactant in the liquid crystal composition is preferably 0.01 to 10% by mass, more preferably 0.01 to 5% by mass, and more preferably 0.02 to 1% by mass with respect to the total mass of the liquid crystal compound. Is more preferred.
  • the chiral agent has a function of inducing the helical structure of the depolarizing film 10.
  • the chiral agent may be selected according to the purpose because the helical direction or helical pitch induced by the compound is different.
  • the chiral agent is not particularly limited, and known compounds (for example, Liquid Crystal Device Handbook, Chapter 3 4-3, TN (twisted nematic), STN (Super Twisted Nematic) chiral agent, page 199, Japan Science Promotion) 142, Committee, Ed. 1989), isosorbide, and isomannide derivatives etc. can be used.
  • chiral agents in which the helical induction power ((Helical Twisting Power)) is changed by light irradiation are preferably used.
  • a chiral agent whose HTP changes upon irradiation with light for example, by exposing the liquid crystal composition through a mask, the HTP of the chiral agent can be partially changed.
  • the chiral agent whose HTP changes upon light irradiation may be a chiral agent whose HTP decreases upon light irradiation, or a chiral agent whose HTP increases upon light irradiation.
  • the chiral agent generally contains an asymmetric carbon atom, but an axial asymmetric compound or a planar asymmetric compound not containing an asymmetric carbon atom can also be used as a chiral agent.
  • Examples of axial asymmetric compounds or planar asymmetric compounds include binaphthyl, helicene, paracyclophane and their derivatives.
  • the chiral agent may have a polymerizable group. When both the chiral agent and the liquid crystal compound have a polymerizable group, they are derived from the repeating unit derived from the polymerizable liquid crystal compound and the chiral agent by the polymerization reaction of the polymerizable chiral agent and the polymerizable liquid crystal compound Polymers having repeating units can be formed.
  • the polymerizable group contained in the polymerizable chiral agent is preferably the same group as the polymerizable group contained in the polymerizable liquid crystal compound. Accordingly, the polymerizable group of the chiral agent is also preferably an unsaturated polymerizable group, an epoxy group or an aziridinyl group, more preferably an unsaturated polymerizable group, and an ethylenically unsaturated polymerizable group. More preferable.
  • the chiral agent may also be a liquid crystal compound.
  • the chiral agent may have a photoisomerizable group.
  • the chiral agent has a photoisomerizable group, it is preferable because the HTP of the chiral agent can be changed by light irradiation.
  • part of the compound which shows photochromic property an azo group, an azoxy group, or a cinnamoyl group is preferable.
  • JP-A-2002-80478, JP-A-2002-80851, JP-A-2002-179668, JP-A-2002-179669, JP-A-2002-179670, and JP-2002- The compounds described in US Pat. No.
  • JP-A-2002-179682 JP-A-2002-338575, JP-A-2002-338668, JP-A-2003-313189, and JP-A-2003-331292 and the like Can be used.
  • the content of the chiral agent in the liquid crystal composition may be appropriately set according to the type of the chiral agent, etc., with which the maximum twist angle of the liquid crystal compound 12 to be twisted and oriented can be realized.
  • the content of the chiral agent is preferably 0.01 to 10 mol%, more preferably 0.01 to 5 mol%, based on the molar content of the liquid crystal compound.
  • the liquid crystal composition contains a polymerizable compound, it preferably contains a polymerization initiator.
  • the polymerization initiator to be used is a photoinitiator which can start a polymerization reaction by ultraviolet irradiation.
  • the photopolymerization initiator include an ⁇ -carbonyl compound (described in each specification of US Pat. No. 2,367,661 and US Pat. No. 2,367,670), an acyloin ether (described in US Pat. No.
  • the content of the photopolymerization initiator in the liquid crystal composition is preferably 0.1 to 20% by mass, more preferably 0.5 to 12% by mass, with respect to the content of the liquid crystal compound.
  • the liquid crystal composition may optionally contain a crosslinking agent in order to improve film strength after curing and improve durability.
  • a crosslinking agent those curable by ultraviolet light, heat, moisture and the like can be suitably used.
  • multifunctional acrylate compounds such as trimethylol propane tri (meth) acrylate and pentaerythritol tri (meth) acrylate; Glycidyl (meth) acrylate And epoxy compounds such as ethylene glycol diglycidyl ether; aziridine compounds such as 2,2-bishydroxymethylbutanol-tris [3- (1-aziridinyl) propionate] and 4,4-bis (ethyleneiminocarbonylamino) diphenylmethane; hexa Isocyanate compounds such as methylene diisocyanate and biuret type isocyanate; polyoxazo
  • a known catalyst can be used according to the reactivity of the crosslinking agent, and in addition to the improvement of the film strength and the durability, the productivity can be improved. These may be used alone or in combination of two or more.
  • the content of the crosslinking agent is preferably 1 to 20% by mass, and more preferably 3 to 10% by mass, with respect to the solid content mass of the liquid crystal composition. If the content of the crosslinking agent is in the above range, the effect of improving the crosslinking density is easily obtained, and the stability of the depolarizing film 10 is further improved.
  • a polymerization inhibitor In the liquid crystal composition, if necessary, a polymerization inhibitor, an antioxidant, an ultraviolet light absorber, a light stabilizer, a coloring material, a metal oxide fine particle, and the like are in a range not to reduce the optical performance etc. Can be added.
  • the liquid crystal composition is preferably used as a liquid when the depolarizing film 10 is formed.
  • the liquid crystal composition may contain a solvent.
  • a solvent There is no restriction
  • the organic solvent is not limited and can be appropriately selected according to the purpose. For example, ketones, alkyl halides, amides, sulfoxides, heterocyclic compounds, hydrocarbons, esters, and ethers Etc. These may be used alone or in combination of two or more. Among these, ketones are preferable in consideration of environmental load.
  • the depolarizing film 10 is applied with a liquid crystal composition on the forming surface of the depolarizing film 10 after applying an orientation control force to the forming surface of the depolarizing film 10 by rubbing or the like, and further, a liquid crystal compound by heating or the like. Are twisted and oriented along the helical axis into a liquid crystal phase, and then the liquid crystal composition is cured by irradiation of ultraviolet light or the like.
  • the depolarizing film 10 is preferably produced by roll-to-roll.
  • roll-to-roll is also referred to as "RtoR".
  • RtoR is a roll formed by winding a long material to be treated, which delivers the material to be treated, transports it in the longitudinal direction, performs various treatments, and treats the material to be treated. , It is a manufacturing method rolled in a roll again.
  • the depolarizing film 10 can be produced efficiently with high productivity.
  • the long support A is conveyed in the longitudinal direction, and the orientation of the surface of the support A is imparted by a method such as rubbing.
  • the orientation is not limited to rubbing, and various known methods such as a method using an alignment film can be used.
  • the method of providing the orientation is not limited to rubbing, and known methods can be used.
  • the so-called photo alignment film may be used to provide alignment by irradiating the light alignment material with polarized light or non-polarized light to form an alignment film.
  • a photoalignment film may be provided on the surface of the support A on which the depolarizing film is formed.
  • the photoalignment material used for the photoalignment film include, for example, JP-A-2006-285197, JP-A-2007-76839, JP-A-2007-138138, JP-A-2007-94071, and JP-2007-. No.
  • Photocrosslinkable polyimides, polyamides or esters described in JP-A-2003-520878, JP-A-2004-529220, and JP-A-4162850, JP-A-9-118717 JP-A-10-506420, JP-A-2003-505561, WO2010 / 150748, JP-A-2013-177561, and JP-A-2014-12823 disclose photodimerizable compounds, in particular Cinnamate compounds, chalcone compounds and coumarin compounds are mentioned as preferred examples.
  • the light alignment film can adjust the alignment direction by the light to be irradiated.
  • the direction of imparting alignment can be adjusted in the direction of linearly polarized light to be irradiated. Therefore, by using the photo alignment film, it becomes possible to pattern the alignment direction, for example, alignment so that the direction of the optical axis derived from the liquid crystal compound on the lower surface side is rotated in the same manner as the upper surface shown in FIG. can do.
  • Examples of usable supports A include resin films of triacetyl cellulose (TAC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate, polyvinyl chloride, acrylic, and polyolefin. Moreover, when using the depolarizing film 10 in the state laminated
  • TAC triacetyl cellulose
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • polycarbonate polyvinyl chloride
  • the support body A has a low haze and has sufficient transparency.
  • a liquid crystal compound to be the depolarizing film 10 is formed on the surface of the support A, as conceptually shown in FIG. 4 while conveying the support A provided with orientation in the longitudinal direction (direction of arrow a in the figure).
  • the liquid crystal composition 10a as described above containing a chiral agent, a surfactant (horizontal alignment agent) and the like is applied.
  • various known methods used for applying a liquid in RtoR such as bar coating, gravure coating, and spray coating, can be used.
  • the coating thickness (coating film thickness) of the liquid crystal composition 10a may be appropriately set according to the composition of the liquid crystal composition 10a and the like so as to obtain a depolarizing film having a target thickness.
  • the liquid crystal composition 10a is irradiated with light through the mask 20 as schematically shown in FIG.
  • the liquid crystal composition 10a may or may not be dry, but is preferably substantially dry. If necessary, the liquid crystal composition 10a may be dried by a known method before irradiating the liquid crystal composition 10a with light.
  • the mask 20 has a stripe shape in which light shielding portions 20 a and light transmitting portions 20 b elongated in the transport direction of the support A are arranged in a direction orthogonal to the transport direction of the support A. It has a mask pattern. The light irradiation changes the chiral agent HTP.
  • a direction orthogonal to the transport direction of the support A that is, a direction orthogonal to the longitudinal direction of the support A is also referred to as a width direction.
  • the width direction is the X direction in which the twist angle of the twist-oriented liquid crystal compound 12 changes continuously
  • the longitudinal direction of the support A is the twist angle of the liquid-crystal compound 12 uniform. It becomes Y direction.
  • the size in the width direction of the light shielding portion 20a and the light transmitting portion 20b is not limited.
  • the distance between the center of the light shielding portion 20 a and the center of the light transmitting portion 20 b in the width direction is substantially the length of one pitch P of the depolarizing film 10. Therefore, preferably, the size in the width direction of the light shielding portion 20 a and the light transmitting portion 20 b is the same length as the length of one pitch P of the target depolarizing film 10. That is, when the target one pitch P is 100 ⁇ m, it is preferable to set the width of the light shielding portion 20a and the light transmitting portion 20b to 100 ⁇ m. Further, the size in the longitudinal direction of the support A of the light shielding portion 20a and the light transmitting portion 20b may be appropriately set according to the light irradiation amount and the like necessary for changing the HTP of the chiral agent.
  • the light blocking portion 20a may have a density that completely blocks light, or may slightly transmit light.
  • all the light shielding portions 20a may have the same density, or light shielding portions 20a having different densities may be mixed.
  • the light shield 20a may have a density distribution.
  • the light shielding portion 20a may have a concentration distribution such that the concentration decreases toward the outside from the center in the width direction.
  • the light to be irradiated may be ultraviolet light, visible light or infrared light. That is, light to be irradiated through the mask 20 may be selected appropriately as light capable of changing the HTP of the chiral agent according to the chiral agent contained in the liquid crystal composition 10a.
  • the atmosphere may be a predetermined atmosphere such as an oxygen atmosphere or a nitrogen atmosphere.
  • the substrate A is conveyed in the longitudinal direction, and the liquid crystal compound 12 is brought into a twisted liquid crystal phase along the helical axis by heating or the like.
  • the chiral agent whose HTP has been changed by exposure diffuses continuously in the width direction due to the action of heat and the like.
  • the exposure through the mask 20 also affects the area shielded by the light shielding portion 20 a of the liquid crystal composition 10 a.
  • the amount of exposure gradually changes so that the center of the light shielding portion 20a has the smallest amount of exposure and the center of the light transmitting portion 20b has the largest amount of exposure. .
  • the twist angle of the liquid crystal compound 12 subjected to twist orientation repeatedly changes alternately in the X direction as changes from “maximum value to minimum value” and “minimum value to maximum value”. Further, on the upper surface, the optical axis derived from the liquid crystal compound 12 is continuous while the size of the twist angle of the liquid crystal compound 12 in a twisted orientation is from the maximum value to the minimum value and from the minimum value to the maximum value. Low-haze, high-polarity depolarizing film with no interface in the plane, which changes in an alternating manner, and the rotation direction of the optical axis derived from the liquid crystal compound 12 alternates counterclockwise and clockwise. 10 can be made.
  • the liquid crystal composition 10a When the liquid crystal compound is twisted and oriented to a liquid crystal phase, the liquid crystal composition 10a is cured by light irradiation and / or heating while transporting the support A in the longitudinal direction to produce the depolarizing film 10 .
  • the curing of the liquid crystal composition 10a is preferably light irradiation, and in particular, curing by ultraviolet irradiation is preferred.
  • the atmosphere may be a predetermined atmosphere such as an oxygen atmosphere or a nitrogen atmosphere. Thereafter, the laminate of the support A and the depolarizing film 10 is wound into a roll.
  • the twist angle of the liquid crystal compound twisted and oriented only in the X direction changes continuously, and the twist angle of the liquid crystal compound is uniform in the Y direction. It is an example of the manufacturing method of the film 10.
  • the twist angle of the liquid crystal compound which is twisted and oriented may be changed in both the X direction and the Y direction.
  • a stripe-like mask but a checker-like (checked pattern) mask is used as a mask for exposing the liquid crystal composition 10a, and in the case of RtoR, conveyance of the support A at the time of exposure May be made intermittently, or the depolarizing film may be produced not by RtoR but by a batch system (sheet-fed system).
  • the produced depolarizing film 10 is, for example, peeled off from the support A and attached to the substrate, or transferred from the support A to the substrate to obtain the laminate of the present invention.
  • various optical elements such as mirrors (mirrors), particularly mirrors for vehicles, glasses having polarization distribution, lenses of sunglasses, and light reflecting members are exemplified.
  • the mirror includes a half mirror.
  • the mirror may be a mirror with an image display function.
  • the depolarizing film may be attached by a known method such as a method using OCA (Optical Clear Adhesive).
  • OCA Optical Clear Adhesive
  • the depolarizing film 10 may be used in the form of a laminate with the support A.
  • Example 1 (Preparation of Liquid Crystal Composition) Each component shown below was mixed and liquid crystal composition was prepared.
  • Liquid crystal compound 1 (the following structure): 1 g -Chiral agent 1 (the following structure): 2.0 mg -Horizontal alignment agent 1 (the following structure): 0.4 mg ⁇
  • Horizontal alignment agent 2 (following structure): 0.15 mg ⁇
  • Photo radical initiator 1 (the following structure): 20 mg -Pentaerythritol tetraacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., A-TMMT (Tetramethylol Methane Tetaacrylate)): 10 mg -Methyl ethyl ketone (MEK): 1.09 g ⁇ Cyclohexanone: 0.16 g
  • a PET film (Cosmo Shine A4100 manufactured by Toyobo Co., Ltd.) having a thickness of 100 ⁇ m was prepared.
  • One side of the support was rubbed with rayon cloth.
  • the conditions for the rubbing treatment were: pressure: 0.1 kgf (0. 98 N), rotation speed: 1000 rpm, transport speed: 10 m / min, number of times: 1 reciprocation.
  • the liquid crystal composition was applied to the rubbing-treated surface of the PET film at room temperature using a wire bar, and then dried to form a coating film.
  • the coating film was adjusted so that the thickness of the coating film (dry film) after drying might be 5 micrometers.
  • a stripe-shaped mask having a 100 .mu.m pitch and 100 .mu.m wide black light-shielding portion (width 100 .mu.m of light transmitting portion) It was irradiated with ultraviolet light (mask exposure). The irradiation with ultraviolet light was adjusted in time so that the exposure amount in the light transmission part was 25 mJ / cm 2 .
  • a light source for ultraviolet irradiation “2UV transilluminator LM-26 type” manufactured by Funakoshi Co., Ltd. was used at a wavelength of 365 nm.
  • the coated film was heat-treated by leaving the support irradiated with ultraviolet light on a hot plate at 90 ° C. for 1 minute to make it into a liquid crystal phase state. Thereafter, the coating film subjected to the heat treatment is irradiated with ultraviolet light at 80 ° C. and 500 mJ / cm 2 at 80 ° C. in a nitrogen atmosphere (oxygen concentration of 500 ppm or less) to cure the coating film of the liquid crystal composition, thereby depolarizing film.
  • a light source of ultraviolet light “EXECURE 3000-W” manufactured by Hoya Candeo OPTRONICS was used.
  • An OCA tape (MHM-UVC15, manufactured by Niei Kako Co., Ltd.) was stuck on a plate glass.
  • a laminate of the produced depolarizing film and a support was attached such that the depolarizing film was on the OCA tape side.
  • Adhesion between the laminate and the OCA tape was performed using a roller. Thereafter, the support was peeled off to prepare a laminate of the depolarizing film and the glass plate.
  • the produced laminate was measured using AxoScan OPMF-1 (manufactured by Opt-Science Corporation), and the twist angle of the liquid crystal compound of the depolarizing film was determined using the attached device analysis software.
  • the liquid crystal compound is twisted and oriented as in the depolarization film 10 shown in FIGS. 1 to 3, and the minimum twist angle is 0 ° and the maximum twist angle is 180 °.
  • One pitch P was 100 ⁇ m.
  • the direction of the optical axis derived from the liquid crystal compound coincides with the rubbing direction
  • the liquid crystal compound derived on the upper surface (on the opposite side to the support (glass plate side)
  • the region in which the direction of the optical axis is continuously rotated and the region in which the direction of the optical axis derived from the liquid crystal compound is continuously rotated clockwise are alternately formed in one direction.
  • Example 2 [Examples 2 to 5, Comparative Example 1]
  • the addition amount of the chiral agent is 2.9 mg (Example 2), 3.9 mg (Example 3), 1.0 mg (Example 4), 0.8 mg (Example 5), and 0 mg (Comparative Example 1).
  • a liquid crystal composition was prepared in the same manner as in Example 1 except that A depolarizing film was formed on a glass plate in the same manner as in Example 1 except that this liquid crystal composition was used.
  • the maximum twist angle of the liquid crystal compound is 270 °
  • the maximum twist angle of the liquid crystal compound is Is 360 °
  • the maximum twist angle of the liquid crystal compound is 90 °
  • the maximum twist angle of the liquid crystal compound is 70
  • the liquid crystal compound was twisted and oriented in the same manner as in Example 1 except for the minimum twist angle and the state of the optical axis derived from the liquid crystal compound on the upper surface and the lower surface, except that the temperature was. In Comparative Example 1, the liquid crystal compound was not twisted and aligned.
  • Comparative Example 2 A depolarizing film was formed on a support (PET film) in the same manner as in Example 1 of JP-A-2011-257479, and the depolarizing film was transferred onto a glass plate in the same manner as in Example 1 of the present invention.
  • the thickness of the depolarizing film was 5 ⁇ m.
  • Example 6 A depolarizing film was formed on a glass plate in the same manner as in Example 1 except that the liquid crystal composition in which the addition amount of the chiral agent was changed to 3.9 mg and the rubbing treatment of the support was not performed. As confirmed in the same manner as in Example 1, the maximum twist angle of the liquid crystal compound was 360 °. In this example, the direction of the optical axis derived from the liquid crystal compound on the lower surface is irregularly directed in various directions.
  • Comparative Example 3 A depolarizing film was formed on a glass plate in the same manner as in Example 1 except that the coating film of the composition was not irradiated with ultraviolet light (mask exposure) through a stripe-like mask.
  • the maximum twist angle of the liquid crystal compound was 180 °.
  • the twist angle of the liquid crystal compound was uniform over the entire surface, and the rotation direction of the optical axis derived from the liquid crystal compound was also the same over the entire surface.
  • each depolarizing film is inserted between two polarizers disposed with the transmission axes orthogonal to each other, and the polarizer on the viewing side is The amount of depolarized light was evaluated by visually confirming the amount of transmitted light while rotating 360 °.
  • the degree of depolarization A when there was no change in the amount of transmitted light Although there is a slight change in the amount of transmitted light, the degree of depolarization B
  • the degree of depolarization C was evaluated as having a clear change in the amount of transmitted light.
  • the depolarizing film of the present invention is a depolarizing film having high transparency and low haze in addition to good depolarizing performance.
  • the maximum twist angle of the liquid crystal compound by setting the maximum twist angle of the liquid crystal compound to 90 ° or more, better depolarization performance can be obtained.
  • the maximum twist angle of the liquid crystal compound by setting the maximum twist angle of the liquid crystal compound to 180 ° or less, a depolarizing film with higher transparency can be obtained.
  • the alignment treatment of the support is carried out to align the direction of the optical axis derived from the liquid crystal compound on the lower surface, thereby obtaining a depolarizing film with higher transparency.
  • Comparative Example 1 in which the liquid crystal compound is not twisted and oriented, the haze is low and the transparency is high, but the depolarization performance is insufficient.
  • the comparative example 2 which is a conventional depolarizing film is sufficient in depolarizing performance but has a high haze of 10% and insufficient transparency.
  • Comparative Example 3 in which the twist of the liquid crystal compound is uniform has insufficient depolarization performance. From the above results, the effects of the present invention are clear.
  • Compound 2 was produced by the method described in JP-A-2005-99248.
  • Preparation of coating solution for circularly polarized light reflective layer ⁇ Preparation of Coating Liquid 1 for Cholesteric Liquid Crystal Layer
  • the components shown below were mixed to prepare a coating liquid 1 for a cholesteric liquid crystal layer.
  • the central wavelength of the selective reflection band of the cholesteric liquid crystal layer formed by the coating liquid 1 for cholesteric liquid crystal layer is 630 nm.
  • the cholesteric liquid crystal layer formed as described later was a right circularly polarized light reflection layer.
  • the cholesteric liquid crystal layer is a layer formed by fixing a cholesteric liquid crystal phase.
  • the “central wavelength of the selective reflection band” of the cholesteric liquid crystal layer is also referred to as the “selective reflection central wavelength”.
  • the above rod-like liquid crystal compound 100 parts by mass of compound 1 Chiral agent for right twist: PARIO COLOR LC756 (manufactured by BASF AG) 4.7 parts by mass Initiator: IRGACURE 819 (manufactured by BASF) 4 parts by mass Alignment control agent: 0.1 parts by mass of compound 2
  • Solvent 2-butanone (manufactured by Wako Pure Chemical Industries, Ltd.) 170 parts by mass
  • ⁇ Preparation of Coating Liquid 2 for Cholesteric Liquid Crystal Layer The components shown below were mixed to prepare a coating liquid 2 for a cholesteric liquid crystal layer.
  • the selective reflection center wavelength of the cholesteric liquid crystal layer formed by the cholesteric liquid crystal layer coating solution 2 is 540 nm.
  • the cholesteric liquid crystal layer formed as described later was a right circularly polarized light reflection layer.
  • the above rod-like liquid crystal compound 100 parts by mass of compound 1 Chiral agent for right twist: PARIO COLOR LC756 (manufactured by BASF AG) 5.5 parts by mass Initiator: IRGACURE 819 (manufactured by BASF) 4 parts by mass Alignment control agent: 0.1 part by mass Compound 2 Crosslinking agent: A-TMMT (manufactured by Shin-Nakamura Chemical Co., Ltd.) 1 part by mass Solvent: 2-butanone (manufactured by Wako Pure Chemical Industries, Ltd.) 170 parts by mass
  • Preparation of Coating Liquid 3 for Cholesteric Liquid Crystal Layer The components shown below were mixed to prepare a coating liquid 3 for a cholesteric liquid crystal layer.
  • the selective reflection center wavelength of the cholesteric liquid crystal layer formed by the coating liquid 3 for cholesteric liquid crystal layer is 450 nm.
  • the cholesteric liquid crystal layer formed as described later was a right circularly polarized light reflection layer.
  • the above rod-like liquid crystal compound 100 parts by mass of compound 1 Chiral agent for right twist: PARIO COLOR LC756 (manufactured by BASF AG) 6.7 parts by mass Initiator: IRGACURE 819 (manufactured by BASF) 4 parts by mass Alignment control agent: 0.1 parts by mass of compound 2
  • Solvent 2-butanone (manufactured by Wako Pure Chemical Industries, Ltd.) 170 parts by mass
  • the coating solution for a 1 ⁇ 4 wavelength plate was applied to the rubbing-treated surface of the temporary support to form a coated film, which was then dried.
  • the obtained coated film-coated temporary support is placed on a hot plate at 30 ° C., and 6 of the coated films is applied to the coated film by the electrodeless lamp “D bulb” (60 mW / cm 2 ) manufactured by Fusion UV Systems. Ultraviolet light was applied for a second to fix the cholesteric liquid crystal phase.
  • a 1 ⁇ 4 wavelength plate with a film thickness of 0.8 ⁇ m was obtained.
  • the circularly polarized light reflection layer was laminated on the produced temporary support-equipped quarter-wave plate according to the following procedure.
  • the circularly polarized light reflection layer includes a cholesteric liquid crystal layer 1 having a selective reflection center wavelength in the red light wavelength range, a cholesteric liquid crystal layer 2 having a selective reflection center wavelength in the green light wavelength range, and selective reflection in the blue light wavelength range.
  • a three-layer configuration with the cholesteric liquid crystal layer 3 having a center wavelength is adopted.
  • the coating liquid 1 for cholesteric liquid crystal layers was apply
  • a quarter-wave plate with a temporary support on which a coating was formed was placed on a hot plate at 30 ° C. and coated with an electrodeless lamp “D bulb” (60 mW / cm 2 ) manufactured by Fusion UV Systems, Inc.
  • the film was irradiated with UV light for 6 seconds to fix the cholesteric liquid crystal phase.
  • a cholesteric liquid crystal layer 1 with a film thickness of 3.5 ⁇ m was obtained.
  • the film thickness of the cholesteric liquid crystal layer 2 was 3.0 ⁇ m, and the film thickness of the cholesteric liquid crystal layer 3 was 2.7 ⁇ m.
  • the transmission spectrum of the laminate A was measured with a spectrophotometer (V-670, manufactured by JASCO Corporation), and transmission spectra having reflection peaks at 630 nm, 540 nm, and 450 nm were obtained.
  • the depolarizing film and the produced laminate A were laminated on a circularly polarized light reflecting surface, and the temporary support of the laminate A was peeled off. Thereafter, the 1 ⁇ 4 wavelength plate side was bonded to the surface of the image display unit of the image display device (iPad (registered trademark) Retina) to produce a mirror with an image display function for a vehicle.
  • the depolarizing film and the laminate A were laminated such that the depolarizing film, the circularly polarized light reflecting layer, the quarter wavelength plate, and the image display apparatus were in this order. At this time, the depolarizing film was laminated such that the glass plate side was opposite to the circularly polarizing plate.
  • the quarter-wave plate was disposed so that the slow axis was inclined 45 ° with respect to the transmission axis of the image display device (polarization direction of light emission of LCD (liquid crystal display)).
  • the depolarizing film produced the mirror with the image display function for vehicles by each depolarizing film using the depolarizing film of Example 1 and the comparative example 1.
  • depolarization film 10 depolarization film 10 a liquid crystal composition 12 liquid crystal compound 20 mask 20 a light shielding portion 20 b light transmitting portion A support

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Abstract

L'invention aborde le problème de la fourniture d'un film d'annulation de polarisation présentant une transparence élevée en plus de performances d'annulation de polarisation, et d'un corps stratifié utilisant ce film d'annulation de polarisation. Ce problème est résolu grâce à l'inclusion d'un composé à cristaux liquides qui est aligné par torsion le long d'un axe hélicoïdal s'étendant le long de la direction de l'épaisseur. L'angle de torsion du composé à cristaux liquides aligné par torsion est d'au moins 0° mais inférieur ou égal à 360°. Ledit composé possède une pluralité de zones où l'angle de torsion du composé à cristaux liquides aligné par torsion diffère. Sur au minimum une surface, l'amplitude de l'angle de torsion de ce composé à cristaux liquides a une direction d'axe optique dérivée du composé à cristaux liquides et changeant de façon continue pour passer de la valeur maximale à la valeur minimale, et de la valeur minimale à la valeur maximale.
PCT/JP2018/045886 2017-12-25 2018-12-13 Film d'annulation de polarisation et corps stratifié WO2019131175A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003313188A (ja) * 2002-04-22 2003-11-06 Fuji Photo Film Co Ltd 光学活性イソマンニド誘導体及びその製造方法、光反応型キラル剤、液晶組成物、液晶カラーフィルター、光学フィルム及び記録媒体、並びに液晶の螺旋構造を変化させる方法、液晶の螺旋構造を固定化する方法
JP2011257479A (ja) * 2010-06-07 2011-12-22 Sumitomo Chemical Co Ltd 偏光解消フィルムおよびこれを用いた偏光板

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003313188A (ja) * 2002-04-22 2003-11-06 Fuji Photo Film Co Ltd 光学活性イソマンニド誘導体及びその製造方法、光反応型キラル剤、液晶組成物、液晶カラーフィルター、光学フィルム及び記録媒体、並びに液晶の螺旋構造を変化させる方法、液晶の螺旋構造を固定化する方法
JP2011257479A (ja) * 2010-06-07 2011-12-22 Sumitomo Chemical Co Ltd 偏光解消フィルムおよびこれを用いた偏光板

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