WO2019142707A1 - Film, stratifié, dispositif d'imagerie, capteur et dispositif d'affichage tête haute - Google Patents

Film, stratifié, dispositif d'imagerie, capteur et dispositif d'affichage tête haute Download PDF

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Publication number
WO2019142707A1
WO2019142707A1 PCT/JP2019/000355 JP2019000355W WO2019142707A1 WO 2019142707 A1 WO2019142707 A1 WO 2019142707A1 JP 2019000355 W JP2019000355 W JP 2019000355W WO 2019142707 A1 WO2019142707 A1 WO 2019142707A1
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film
liquid crystal
max
light
group
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PCT/JP2019/000355
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English (en)
Japanese (ja)
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理恵 ▲高▼砂
寛 稲田
二村　恵朗
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富士フイルム株式会社
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Priority to JP2019566432A priority Critical patent/JP6916913B2/ja
Publication of WO2019142707A1 publication Critical patent/WO2019142707A1/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

Definitions

  • the present invention relates to a film, a laminate, an imaging device, a sensor and a head-up display.
  • a film using a cholesteric liquid crystal phase (hereinafter also referred to as "cholesteric liquid crystal film”) is known as a film having a property of selectively reflecting either right circularly polarized light or left circularly polarized light in a specific wavelength range. ing.
  • cholesteric liquid crystal films are applied to various applications.
  • Patent Document 1 discloses a projection screen having a polarization selective reflection layer which is a cholesteric liquid crystal film, and shows a structure in which three layers having different selective reflection center wavelengths are stacked as the polarization selective reflection layer. There is.
  • Patent Document 1 if a layer that reflects blue light, a layer that reflects green light, and a layer that reflects red light are stacked as layers having different selective reflection center wavelengths from each other, Since light of multiple reflection wavelengths can be mixed, various colors can be expressed in principle. However, when layers having different selective reflection center wavelengths are stacked as in Patent Document 1, various processes such as exposure are required for each layer, which complicates manufacturing. As a method of solving such a problem, for example, a method of arranging a plurality of regions having different selective reflection center wavelengths in the plane of the cholesteric liquid crystal film can be considered.
  • this invention is a film which fixes a cholesteric liquid crystal phase, Comprising: It aims at provision of the film which was excellent in the reproducibility of the white in the case where the surface of a film was seen from the front, and excellent in visibility. .
  • Another object of the present invention is to provide a laminate, an imaging device, a sensor and a head-up display having the above-mentioned film.
  • the inventors of the present invention have a plurality of regions having different selective reflection center wavelengths in the in-plane direction as a film formed by fixing the cholesteric liquid crystal phase, and the size of the minor diameter of the plurality of regions Is a predetermined value or less, and has a local maximum value of reflectance at a predetermined wavelength, and when the film whose reflectance relationship of the predetermined wavelength satisfies the predetermined relationship is used, the white color when the surface of the film is viewed from the front It has been found that the reproducibility of the above and the visibility are excellent, and the present invention has been made. That is, the present inventors have found that the above problems can be solved by the following configuration.
  • a film in which a cholesteric liquid crystal phase is fixed The film has a plurality of regions in which the selective reflection central wavelength is different in the in-plane direction of the film, and the sizes of the minor diameters of the plurality of regions are each 200 ⁇ m or less,
  • the film has one maximum reflectance value in each of the wavelength range of 400 to 500 nm and the wavelength range of 560 to 700 nm,
  • the above film has a maximum value of reflectance in a wavelength range of 400 to 500 nm as I max X, a minimum value of reflectance at a wavelength of 500 to 600 nm as I min Y, and a maximum value of reflectance in a range of wavelength 560 to 700 nm.
  • the film according to [2] which satisfies the relation of I max X / I max Z> 1.4.
  • the film according to any one of [1] to [3], wherein the minor axis size of each of the plurality of regions is 100 ⁇ m or less.
  • [6] A laminated body in which the film according to any one of [1] to [5], a ⁇ / 4 plate, and a linear polarizing plate are laminated in this order. [7] The laminated body as described in [6] used as a decoration film. [8] An imaging apparatus comprising: an imaging unit; and a concealing member for concealing the imaging unit, the imaging apparatus comprising: An imaging device, wherein the concealing member comprises the film according to any one of [1] to [4] or the laminate according to [6]. [9] A sensor comprising: a sensor unit; and a concealing member for concealing the sensor unit, A sensor, wherein the concealing member comprises the film according to any one of [1] to [4] or the laminate according to [6]. [10] A head-up display having a combiner, A head-up display, wherein the combiner has the film according to any one of [1] to [4] or the laminate according to [6].
  • the present invention is a film having a cholesteric liquid crystal phase fixed, which is excellent in white reproducibility when the surface of the film is viewed from the front, and excellent in visibility.
  • it is possible to provide a laminate, an imaging device, a sensor and a head-up display having the above-mentioned film.
  • a numerical range represented using “to” means a range including numerical values described before and after “to” as the lower limit value and the upper limit value.
  • (meth) acrylate is a description showing both an acrylate and a methacrylate.
  • a specific angle such as 45 ° is intended to include the range of allowable error in the technical field to which the present invention belongs. For example, in the present invention, the angle means less than ⁇ 5 ° and the like for the specifically indicated exact angle, and the error for the indicated exact angle is not more than ⁇ 3 ° It is preferable that the angle be ⁇ 1 ° or less.
  • the term "sense” for circularly polarized light means that it is right circularly polarized light or left circularly polarized light.
  • the sense of circularly polarized light is right circularly polarized when the tip of the electric field vector rotates clockwise with time increase when the light is viewed as it travels to the front, and left when counterclockwise.
  • the term “sense” may be used for the twist direction of the helix of the cholesteric liquid crystal phase.
  • the selective reflection by the cholesteric liquid crystal phase reflects right circularly polarized light and transmits left circularly polarized light when the twist direction (sense) of the helix of the cholesteric liquid crystal phase is right, and reflects left circularly polarized light when the sense is left. Right circularly polarized light.
  • Visible light is light of wavelengths visible to human eyes among electromagnetic waves, and shows light in a wavelength range of 380 to 780 nm.
  • Nonvisible light is light in a wavelength range of less than 380 nm or in a wavelength range of more than 780 nm.
  • the light in the wavelength range of 400 to 500 nm is blue light
  • the light in the wavelength range of 500 to 560 nm is green light, 560 to 700 nm
  • the light in the wavelength range of is red light.
  • the “selective reflection center wavelength” means a wavelength (nm) indicating the maximum value of the reflectance of an object (member) to be processed.
  • the film of the present invention is a film obtained by fixing a cholesteric liquid crystal phase. Further, the film of the present invention has a plurality of regions in which the selective reflection center wavelength is different in the in-plane direction of the film, and the minor diameter of each of the plurality of regions is 200 ⁇ m or less. In addition, the film in the present invention has one maximum reflectance value in each of the wavelength range of 400 to 500 nm and the wavelength range of 560 to 700 nm.
  • the maximum value of reflectance in a wavelength range of 400 to 500 nm is I max X
  • the minimum value of reflectance in a wavelength of 500 to 600 nm is I min Y
  • FIG. 1 is a plane schematic diagram which shows an example (1st Embodiment) of embodiment of the film of this invention.
  • FIG. 2 is a schematic cross-sectional view taken along line AA 'of the schematic plan view shown in FIG.
  • the film 10 is a film formed by fixing a cholesteric liquid crystal phase.
  • the film 10 has two regions in which the helical pitch of the cholesteric liquid crystal phase is different from each other. Specifically, the film 10 reflects the right circularly polarized light of red light and reflects the left circularly polarized light of red light and the red circular reflection region of 12 R that transmits light of other wavelength ranges and the right circularly polarized light of blue light.
  • the red reflective region 12R and the blue reflective region 12B are arranged in this order in the in-plane direction of the film 10 (the direction intersecting the thickness direction of the film 10).
  • the red reflective region 12R and the blue reflective region 12B are periodically arranged along a predetermined direction in the plane, using this as a unit. More specifically, as shown in FIG. 1, the red reflective area 12R and the blue reflective area 12B are arranged in stripes.
  • the red reflective region 12R and the blue reflective region 12B each have wavelength selective reflectivity for right circularly polarized light in a specific wavelength range.
  • the pitch of the cholesteric liquid crystal phase depends on the type of chiral agent used with the liquid crystal compound, or the concentration thereof, so that the desired pitch can be obtained by adjusting these.
  • the ⁇ n can be adjusted by the type of liquid crystal compound forming the reflective region and the mixing ratio thereof, and the temperature at the time of alignment. It is also known that the reflectance in the cholesteric liquid crystal phase depends on ⁇ n, and in order to obtain a similar reflectance, the number of helical pitch is smaller, ie, the film thickness is thinner, as ⁇ n is larger.
  • the reflected light of the cholesteric liquid crystal phase is circularly polarized light. Whether the reflected light is right circularly polarized light or left circularly polarized light depends on the twisting direction of the helix of the cholesteric liquid crystal phase.
  • the selective reflection of circularly polarized light by the cholesteric liquid crystal phase reflects right circularly polarized light when the helical twist direction of the cholesteric liquid crystal phase is right, and reflects left circularly polarized light when the helical twist direction is left.
  • the red reflective region 12R and the blue reflective region 12B are layers including a cholesteric liquid crystal phase of right twist.
  • the direction of swirling of the cholesteric liquid crystal phase can be adjusted by the type of liquid crystal compound forming the reflective region or the type of chiral agent to be added.
  • the blue reflection area 12B is an area having a selective reflection center wavelength in a wavelength range of 400 to 500 nm
  • the red reflection area 12R is an area having a selective reflection center wavelength in a wavelength range of 560 to 700 nm.
  • the red reflective area 12R and the blue reflective area 12B are arranged adjacent to each other in this order. As described above, when the regions where the selective reflection center wavelengths are different from each other are disposed adjacent to each other, the reproducibility of the white color when the film 10 is viewed from the front is more excellent. Further, in the example of FIG. 1, the red reflective regions 12R and the blue reflective regions 12B are alternately arranged with the red reflective regions 12R and the blue reflective regions 12B as one cycle. Here, in the vicinity of the interface between the red reflective region 12R and the blue reflective region 12B, green light is likely to be reflected due to the influence of the two regions.
  • the reflection wavelength changes continuously along the direction in which the red reflection area 12R and the blue reflection area 12B are alternately arranged. It will be in the state of doing.
  • the helical pitch of the cholesteric liquid crystal of the film 10 is continuously changed along the direction in which the adjacent regions are aligned. Thereby, when the film 10 is seen from the front, the white reproducibility is more excellent.
  • Each of the regions has a minor axis size of 200 ⁇ m or less, preferably 150 ⁇ m or less, and particularly preferably 100 ⁇ m or less. If the size of the minor diameter is 200 ⁇ m or less, the respective regions are less likely to be viewed by human eyes, and thus a film excellent in visibility (that is, each region is less likely to be viewed) can be obtained.
  • the lower limit of the size of the minor axis of each region is not particularly limited, but is 10 ⁇ m or more because both the red and blue reflection regions and the region where the helical pitch of the cholesteric liquid crystal changes continuously are compatible. Preferably, 20 ⁇ m or more is particularly preferable.
  • the size of the minor axis of the region means the length of the short side of the rectangle when the shape of the region is rectangular, and the size of the short side of the region when the shape of the region is square It means the length of one side, and when the shape of the area is a perfect circle, it means the diameter of the circle.
  • the size of the minor diameter of the area is largest among parallel two straight lines circumscribing the area when the film is viewed from the front. The distance between two parallel straight lines is defined as the major axis (L1 in FIG.
  • the size of the minor axis of the region is calculated by analyzing, with NIS-ElementsD, one observed in an incident light mode of a Nikon microscope (objective lens 10 ⁇ ).
  • the size of the major axis of the region is not particularly limited.
  • each area is a quadrangle (rectangle).
  • shape of each region is not limited to this, and may be any shape such as, for example, a triangle, a quadrangle (for example, a rectangle and a square), a circle, an ellipse, and an irregular shape.
  • FIG. 3 is an example of a preferred embodiment of the reflection spectrum of the film 10.
  • the vertical axis indicates the reflection intensity I
  • the horizontal axis indicates the wavelength W (nm).
  • the film 10 has one maximum reflectance value in each of the wavelength range of 400 to 500 nm and the wavelength range of 560 to 700 nm.
  • the maximum value of reflectance in the wavelength range of 400 to 500 nm is I max X
  • the minimum value of reflectance in wavelength of 500 to 600 nm is I min Y
  • the maximum value of reflectance in the range of wavelength 560 to 700 nm is I max Z when a, I max X / I max Z > 1, I min Y / I max X> 0.3 and, satisfy all the relationships I min Y / I max Z> 0.5.
  • I max X, I min Y, and I max Z satisfy the above-mentioned relationship, for example, the pattern shape of a mask, the distance between the mask and the coating film of the liquid crystal composition, used when producing the film 10 And the method of adjusting the exposure amount etc. with respect to the coating film of a liquid-crystal composition.
  • I max X, I min Y and I max Z are obtained from the reflection spectrum of the film of the present invention. Further, the reflection spectrum of the film of the present invention is measured according to the method described in the Examples section described later.
  • the maximum reflectance (ie, I max Z) of the film 10 in the wavelength range of 560 to 700 nm is preferably in the wavelength range of 600 to 700 nm.
  • an angle inclined Preferably an angle inclined 30 degrees.
  • the reproducibility of the whiteness of the film 10 is excellent.
  • the maximum value of reflectance in the wavelength range of 400 to 500 nm (that is, I max X) is in the wavelength range of 425 to 500 nm (more preferably 450 to 500 nm), and the wavelength of 560 to It is more preferable that the maximum value of the reflectance in the range of 700 nm (ie, I max Z) be in the range of 580 to 700 nm (more preferably, 600 to 700 nm).
  • the upper limit value of the reflection intensity at the wavelength of the middle point is preferably I max Z or less, more preferably less than I max Z. If the reflection intensity at the wavelength of the middle point is larger than 0.5 ⁇ I max Z, the film 10 can reflect green light well, so the reproducibility of whiteness when the film 10 is viewed from the front is It is better.
  • I max X and I max Z satisfies a relationship of I max X / I max Z> 1, preferably satisfy the relation of I max X / I max Z> 1.2, I max X / I max Z> It is particularly preferable to satisfy the relationship of 1.4. If the relationship of I max X / I max Z> 1.4 is satisfied, the reproducibility of white when the surface of the film 10 is viewed from the front is more excellent. I max X and I max Z are 3.5> preferably satisfy the relation of I max X / I max Z, 3.0> satisfy the relation of I max X / I max Z is particularly preferred. If the relationship of 2.8> ImaxX / ImaxZ is satisfied, the reproducibility of white when the surface of the film 10 is viewed from the front is more excellent.
  • I max X and I min Y satisfy the relation of I min Y / I max X> 0.3, and satisfy the relation of I min Y / I max X> 0.35, I min Y / I max It is particularly preferred to satisfy the relationship X> 0.4. If the relationship of I min Y / I max X> 0.4 is satisfied, the reproducibility of white when the film 10 is viewed from the front is more excellent.
  • the human eye has the highest sensitivity to green reflected light at 555 nm, so that I max X and I min Y satisfy the above relationship, the intensity of the green reflected light is appropriately adjusted, and the whiteness is reproduced. I think that the sex has improved.
  • I max X and I min Y preferably satisfy the relation of 0.9> I min Y / I max X, and particularly preferably satisfy the relation of 0.8> I min Y / I max X. If the relationship of 0.8> I min Y / I max X is satisfied, the reproducibility of white when the surface of the film 10 is viewed from the front is more excellent.
  • I min Y and I max Z satisfy the relationship of I min Y / I max Z> 0.5, and satisfy the relationship of I min Y / I max Z> 0.6, I min Y / I max It is particularly preferable to satisfy the relationship of Z> 0.8. If the relationship of I min Y / I max Z> 0.8 is satisfied, the reproducibility of white when the film 10 is viewed from the front is more excellent.
  • the human eye has the highest sensitivity to green reflected light at 555 nm, so that I max X and I min Y satisfy the above relationship, the intensity of the green reflected light is appropriately adjusted, and the whiteness is reproduced. I think that the sex has improved.
  • I min Y and I max Z satisfy the relationship of 1> I min Y / I max Z. If the relationship of 1> I min Y / I max Z is satisfied, the white reproducibility when the surface of the film 10 is viewed from the front is excellent.
  • the film 10 has reflectance in the entire wavelength range between the wavelength corresponding to I max X and the wavelength corresponding to I max Z. Thereby, the reproducibility of the whiteness when the film 10 is viewed from the front is further improved.
  • the red reflective region 12R and the blue reflective region 12B are adjacent to each other
  • the method of arranging in As a result, the helical pitch of the cholesteric liquid crystal of the film 10 is continuously changed along the direction in which the adjacent regions align , and as a result, the wavelength corresponding to I max X and I max Z are supported. It is considered to show the reflectance in the entire wavelength range between
  • the thickness of the film 10 is not particularly limited, but is preferably 1 to 10 ⁇ m, more preferably 2 to 8 ⁇ m, and particularly preferably 3 to 6 ⁇ m from the viewpoint of excellent color developability and orientation.
  • the film 10 formed by fixing the cholesteric liquid crystal phase may have a structure in which the alignment of the liquid crystal compound which is the cholesteric liquid crystal phase is maintained, and typically, the alignment state of the polymerizable liquid crystal compound in the cholesteric liquid crystal phase If it is a structure that is polymerized and cured by ultraviolet irradiation, heating, etc. to form a layer without fluidity, and at the same time, it changes to a state in which no change in orientation is caused by external fields or external force. Good. In the film 10 in which the cholesteric liquid crystal phase is fixed, it is sufficient if the optical properties of the cholesteric liquid crystal phase are maintained, and the liquid crystal compound may no longer exhibit liquid crystallinity. For example, the polymerizable liquid crystal compound may become high in molecular weight by the curing reaction and may no longer have liquid crystallinity.
  • liquid crystal composition examples of the material used to form the film 10 include a liquid crystal composition containing a liquid crystal compound.
  • the liquid crystal compound is preferably a liquid crystal compound (polymerizable liquid crystal compound) having a polymerizable group.
  • the liquid crystal composition (also referred to as “polymerizable liquid crystal compound” in the present specification) containing a polymerizable liquid crystal compound may further contain a surfactant, a chiral agent, a polymerization initiator and the like. Each component will be described in detail below.
  • 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 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.
  • a polymeric group an unsaturated polymeric group, an epoxy group, and an aziridinyl group are mentioned, An unsaturated polymeric group is preferable and an ethylenically unsaturated polymeric 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. Examples of the polymerizable liquid crystal compound include Makromol. Chem. 190, 2255 (1989), Advanced Materials 5, 107 (1993), U.S. Pat. No. 4,683,327, U.S. Pat.
  • polymerizable liquid crystal compound examples include compounds represented by the following formulas (1) to (11).
  • X 1 is 2 to 5 (integer).
  • 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 to the main chain, a side chain, or both the main chain and the side chain a polymer in which a cholesteryl group is introduced to a side chain Cholesteric liquid crystals, liquid crystalline polymers as disclosed in JP-A-9-133810, and liquid crystalline polymers 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 is preferably 80 to 99. It is more preferable that it is mass%, and it is further preferable that it is 85 to 90 mass%.
  • the chiral agent has a function of inducing the helical structure of the cholesteric liquid crystal phase.
  • the chiral compound may be selected according to the purpose because the helical direction or helical pitch induced by the compound differs.
  • the chiral agent is not particularly limited, and known compounds (for example, liquid crystal device handbook, Chapter 3 4-3, TN (twisted nematic), chiral agents for STN (Super-twisted nematic), page 199, Japanese Studies Promotion Committee 142, Ed., 1989), isosorbide and isomannide derivatives can be used.
  • 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.
  • a chiral agent that can be sensitive to light and change the helical pitch of the cholesteric liquid crystal phase It is preferable to use a photosensitive chiral agent).
  • the photosensitive chiral agent is a compound capable of changing its structure by absorbing light and changing the helical pitch of the cholesteric liquid crystal phase.
  • a compound which causes at least one of a photoisomerization reaction, a photodimerization reaction, and a photolysis reaction is preferable.
  • the compound that causes a photoisomerization reaction refers to a compound that causes stereoisomerization or structural isomerization by the action of light.
  • a photoisomerization compound an azobenzene compound, and a spiropyran compound etc. are mentioned, for example.
  • a compound that causes a photodimerization reaction refers to a compound that undergoes an addition reaction between two groups to cause cyclization by light irradiation.
  • the photo-dimerization compound include cinnamic acid derivatives, coumarin derivatives, chalcone derivatives, and benzophenone derivatives.
  • the chiral agent represented by the following general formula (I) is mentioned preferably.
  • This chiral agent can change the alignment structure such as the helical pitch (twisting force, helical twist angle) of the cholesteric liquid crystal phase according to the amount of light at the time of light irradiation.
  • Ar 1 and Ar 2 represent an aryl group or a heteroaromatic ring group.
  • the aryl group represented by Ar 1 and Ar 2 may have a substituent, and preferably has 6 to 40 carbon atoms in total, and more preferably 6 to 30 carbon atoms in total.
  • a substituent for example, a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, a hydroxyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyloxy group, a carboxyl group, a cyano group or a heterocyclic ring A group is preferable, and a halogen atom, an alkyl group, an alkenyl group, an alkoxy group, a hydroxyl group, an acyloxy group, an alkoxycarbonyl group or an aryloxycarbonyl group is more preferable.
  • aryl groups represented by the following general formula (III) or (IV) are preferable.
  • R 1 in the general formula (III) and R 2 in the general formula (IV) each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an alkoxy group, It represents a hydroxyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyloxy group, a carboxyl group or a cyano group.
  • L 1 in the general formula (III) and L 2 in the general formula (IV) each independently represent a halogen atom, an alkyl group, an alkoxy group or a hydroxyl group, and an alkoxy group having 1 to 10 carbon atoms, Alternatively, a hydroxyl group is preferred.
  • l represents an integer of 0, 1 to 4, preferably 0 or 1.
  • m represents an integer of 0 or 1 to 6, preferably 0 or 1.
  • L 1 and L 2 may represent different groups.
  • the heteroaromatic ring group represented by Ar 1 and Ar 2 may have a substituent, and preferably has 4 to 40 carbon atoms in total, and more preferably 4 to 30 carbon atoms in total.
  • a substituent for example, a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, a hydroxyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyloxy group or a cyano group is preferable.
  • a halogen atom, an alkyl group, an alkenyl group, an aryl group, an alkoxy group or an acyloxy group is more preferable.
  • heteroaromatic ring groups include pyridyl group, pyrimidinyl group, furyl group, and benzofuranyl group, and among them, pyridyl group or pyrimidinyl group is preferable
  • the content of the chiral agent in the liquid crystal composition is preferably 0.01 to 200 mol%, more preferably 1 to 30 mol%, of the amount of the polymerizable 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. Nos. 2,367,661 and 2367670), an acyloin ether (described in US Pat. No. 2,448,828), an ⁇ -hydrocarbon-substituted aroma Acyloin compounds (as described in US Pat. No.
  • the content of the photopolymerization initiator in the liquid crystal composition is preferably 0.1 to 20% by mass with respect to the content of the polymerizable liquid crystal compound, and is 0.5 to 12% by mass More preferable.
  • the liquid crystal composition may optionally contain a crosslinking agent in order to improve film strength after curing and improve durability.
  • a crosslinking agent one which is cured by ultraviolet light, heat, moisture or the like can be suitably used.
  • the crosslinking agent is not particularly limited and may be appropriately selected depending on the purpose.
  • Examples thereof include polyfunctional acrylate compounds such as trimethylolpropane tri (meth) acrylate and pentaerythritol tri (meth) acrylate; glycidyl (meth) Epoxy compounds such as acrylates and ethylene glycol diglycidyl ether; Aziridine compounds such as 2,2-bishydroxymethylbutanol-tris [3- (1-aziridinyl) propionate], and 4,4-bis (ethyleneiminocarbonylamino) diphenylmethane; Isocyanate compounds such as hexamethylene diisocyanate and biuret type isocyanate; polyoxazoline compounds having an oxazoline group in the side chain; vinyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropyl Alkoxysilane compounds such as trimethoxysilane and the like.
  • polyfunctional acrylate compounds such as trimethylolpropane tri (meth) acryl
  • 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 0.1 to 20% by mass, and more preferably 1 to 10% by mass, with respect to the content of the polymerizable liquid crystal compound.
  • a surfactant for example, a fluorosurfactant etc.
  • a polymerizable compound for example, a polymerization inhibitor, an antioxidant, a horizontal alignment agent, an ultraviolet light absorber, light stabilization
  • an agent, a coloring material, metal oxide fine particles, etc. can be added in the range which does not reduce optical performance etc.
  • the liquid crystal composition may contain a solvent.
  • the solvent is not particularly limited and may be appropriately selected depending on the purpose, but an organic solvent is preferable.
  • the organic solvent is not particularly limited and may be appropriately selected according to the purpose. Examples thereof include methyl ethyl ketone, methyl isobutyl ketone and ketones such as cyclohexanone and cyclopentanone, alkyl halides, amides, sulfoxides and hetero Examples include ring compounds, hydrocarbons, esters, and ethers. These may be used alone or in combination of two or more.
  • the film 10 of the present invention can be used in a known application to which a film having a cholesteric liquid crystal phase is applied, and can be used, for example, as a decorative film, a cover member of a photographing device or sensor, or a combiner of a head-up display.
  • the decorative film can be used to decorate various substrates, and the type of the substrate is not particularly limited.
  • an imaging device an aspect having an imaging unit and a concealing member for concealing the imaging unit can be mentioned.
  • a sensor the aspect which has a sensor unit and the concealing member for concealing the said sensor unit is mentioned.
  • a head-up display the head-up display which has a combiner is mentioned.
  • the specific structures of the photographing device, the sensor and the head-up display are well known and will not be described.
  • the film 10 has a red reflective area 12R and a blue reflective area 12B in this order along a predetermined direction, and it is periodically arranged in a predetermined direction in the plane, taking this as one unit.
  • a red reflective area 12R and a blue reflective area 12B in this order along a predetermined direction, and it is periodically arranged in a predetermined direction in the plane, taking this as one unit.
  • An example is shown, but the configuration of the film of the present invention is not limited thereto. Specifically, each region in the film of the present invention may be randomly arranged without being periodically arranged.
  • FIG. 1 shows the case where the areas of the red reflection area 12R and the blue reflection area 12B are substantially the same, the present invention is not limited thereto, and the areas of the respective areas are different even though they are the same. It is also good.
  • the method for producing the film 10 is not particularly limited, and any known method can be adopted, but the following steps 1 to 4 are preferable because the relationship between I max X, I min Y and I max Z can be easily set in the above-mentioned range.
  • Step 1 Step of Forming a Coating Using a Liquid Crystal Compound Having a Polymerizable Group and a Liquid Crystal Composition Containing a Chiral Agent Sensitive to Light and Capable of Changing the Helical Pitch of the Cholesteric Liquid Crystal Phase
  • Step 2 Chiral Agent is Photosensitive Step of exposing the coating film in a pattern by exposure to light: step of heating the coating film subjected to the exposure treatment to orient the liquid crystal compound to form a cholesteric liquid crystal phase 4: A step of curing the coated film subjected to the heat treatment to form a film formed by fixing the cholesteric liquid crystal phase
  • Step 1 is a step of forming a coating using a liquid crystal compound having a polymerizable group, and a liquid crystal composition containing a chiral agent that is sensitive to light and can change the helical pitch of the cholesteric liquid crystal phase.
  • the coating film 10a is first formed by carrying out this process.
  • the coating film 10a may be formed on a substrate (not shown).
  • a transfer base material may be used, and you may form directly on a photomask.
  • the film 10 may be formed directly on the circularly polarizing plate using the circularly polarizing plate.
  • the surface of the substrate may be subjected to an orientation treatment before the coating film 10a is formed.
  • the orientation treatment By performing the orientation treatment, the orientation of the cholesteric liquid crystal phase formed on the coating film 10a can be improved, and the transmittance of the film 10 can be further enhanced.
  • the liquid crystal compound having a polymerizable group and the photosensitive chiral agent contained in the liquid crystal composition are as described above.
  • the components that may be contained in the liquid crystal composition are also as described above.
  • the solid content concentration of the liquid crystal composition is preferably 10 to 60% by mass, and more preferably 20 to 50% by mass, with respect to the total mass of the liquid crystal composition, from the viewpoint of coatability.
  • coating the liquid-crystal composition mentioned above on a base material is mentioned, for example.
  • the application method is not particularly limited, and examples thereof include wire bar coating, extrusion coating, direct gravure coating, reverse gravure coating, and die coating.
  • the thickness of the coating film is not particularly limited, but is preferably 0.1 to 20 ⁇ m, more preferably 0.2 to 15 ⁇ m, and particularly preferably 0.5 to 10 ⁇ m in that the white reproducibility of the film 10 is more excellent.
  • Step 2 is a step of subjecting the coating film to a pattern of exposure treatment with light to which the chiral agent is sensitive. By carrying out this step, it is possible to make a difference in the helical induction force of the chiral agent between the respective regions depending on the difference in exposure amount. Therefore, by further carrying out the procedure described later, it is possible to form regions in which the selective reflection center wavelengths are different from each other.
  • the method of performing the exposure process in a pattern is not particularly limited, but a method using a mask having an opening may be mentioned. More specifically, as shown in S2 of FIG. 4, light of a wavelength to which the photosensitive chiral agent emitted from the light source S is exposed through the mask M having a pattern having a predetermined density gradation, The coating film 10a is exposed to light to form an exposed coating film 10b.
  • the mask M has a stripe-like pattern in which portions having density gradations are periodically arranged so that regions having different amounts of light irradiated to the coating film 10a can be formed.
  • the mask M shown in FIG. 4 has a dark color part (for example, a light shielding part) and a light color part (for example, a transmission part).
  • a dark color part for example, a light shielding part
  • a light color part for example, a transmission part
  • the portion of the coating film 10a corresponding to the boundary between the dark color portion and the light color portion of the mask M that is, the vicinity of the interface between the red reflection region 12R and the blue reflection region 12B in FIG. Because light of an intermediate intensity is irradiated with light passing through the dark part and light passing through the light part of the mask M, and the concentration gradient of the chiral agent in the red reflection area 12R and the blue reflection area 12B It is considered as the influence of the diffusion of the chiral agent due to the influence of
  • the distance between the mask M and the coating film 10a is not particularly limited as long as a desired pattern is formed, but the mask and the coating film should be as close as possible to reproduce a fine line regardless of the light source. It is preferable to perform exposure after closely adhering.
  • the liquid crystal composition contains a polymerization initiator, it is preferable to carry out exposure with light of a wavelength at which the polymerization initiator is difficult to sensitize.
  • the irradiation amount of light is not particularly limited as long as a desired pattern is formed.
  • the coating film 10a may be heated. The heating temperature is preferably 15 to 50 ° C., and more preferably 20 to 40 ° C.
  • FIG. 4 shows an example using the mask M having a stripe pattern
  • the pattern shape of the mask is not particularly limited as long as a desired pattern can be formed on the film.
  • the step 3 is a step of subjecting the coating film subjected to the exposure treatment of the step 2 to a heat treatment to align the liquid crystal compound to a cholesteric liquid crystal phase.
  • the coating film 10c in the cholesteric liquid crystal phase can be formed by heat treatment using the heater H or the like.
  • the liquid crystal phase transition temperature of the liquid crystal composition is preferably 10 to 250 ° C., particularly preferably 10 to 150 ° C., from the viewpoint of production suitability.
  • As a preferable heating condition it is preferable to heat the liquid crystal composition at 40 to 100 ° C. (preferably 60 to 100 ° C.) for 0.5 to 5 minutes (preferably 0.5 to 2 minutes).
  • the film 10 may be able to be formed without performing the heat treatment of step 3.
  • the process 3 may be performed with the mask attached or removed.
  • Step 4 is a step of curing the coated film subjected to the heat treatment to form a film 10 in which the cholesteric liquid crystal phase is fixed.
  • the method of the curing treatment is not particularly limited, and examples thereof include light curing treatment and heat curing treatment. Among them, light irradiation treatment is preferable, and as shown in S4 of FIG. 4, ultraviolet ray irradiation treatment using a UV (ultraviolet ray) light source is more preferable.
  • a light source such as a UV lamp is used for UV irradiation.
  • the mask may be removed or the irradiation may be performed from the side opposite to the mask while the mask is attached.
  • the irradiation amount of the ultraviolet light is not particularly limited, generally, about 100 to 1000 mJ is preferable.
  • the time of irradiation with ultraviolet light is not particularly limited, but may be appropriately determined from the viewpoint of the strength and productivity of the obtained reflective layer.
  • FIG. 5 is a schematic plan view showing an example (second embodiment) of the embodiment of the film of the present invention.
  • FIG. 6 is a schematic cross-sectional view taken along line BB ′ of the schematic plan view shown in FIG.
  • the film 20 is a film formed by fixing a cholesteric liquid crystal phase.
  • the film 20 has two regions in which the helical pitch of the cholesteric liquid crystal phase is different from each other.
  • the film 20 in the second embodiment is substantially the same as the film 10 in the first embodiment except that the type and arrangement of the respective regions are different, and therefore the description of the common portions is omitted. Further, in the second embodiment, the modification in the first embodiment can also be applied.
  • the film 20 reflects the right circularly polarized light of red light and reflects the left circularly polarized light of red light and the red circular reflecting region 22R transmitting light of other wavelength ranges and the right circularly polarized light of blue light.
  • And blue reflection area 22B transmitting left circularly polarized light of blue light and light of other wavelength range.
  • the red reflective regions 22R and the blue reflective regions 22B are alternately arranged in the in-plane direction of the film 20 (the direction intersecting the thickness direction of the film 20).
  • the red reflective regions 22R and the blue reflective regions 22B are alternately arranged in a plane along a predetermined direction and a direction intersecting the same, and are arranged in a so-called checkered flag (lattice pattern).
  • the red reflective region 22R and the blue reflective region 22B each have wavelength selective reflectivity for right circularly polarized light in a specific wavelength range.
  • the method for producing the film 20 is not limited to this, but, for example, the pattern of the mask for exposing the coating film of the liquid crystal composition described above is changed to a mask having a checkered flag corresponding to the pattern of the film 20 of FIG. Can be manufactured in the same manner as the film 10 of the first embodiment.
  • the linearly polarizing plate has a function of extracting linearly polarized light, and includes a film having a layer in which a polarizer (for example, a dichroic substance such as iodine or an organic dye) is oriented.
  • the ⁇ / 4 plate has a ⁇ / 4 function, and specific examples thereof include a stretched polymer film and a retardation film in which an optically anisotropic layer having a ⁇ / 4 function is provided on a support. .
  • a structure in which a linear polarizing plate and a ⁇ / 4 plate are laminated in this order is used as a circularly polarizing plate.
  • This structure transmits circularly polarized light opposite to the turning direction of the circularly polarized light reflected by the film formed by fixing the cholesteric liquid crystal phase.
  • the linearly polarizing plate and the ⁇ / 4 plate are light incident from the ⁇ / 4 plate side.
  • the slow axis of the ⁇ / 4 plate and the transmission axis of the linearly polarizing plate are aligned. More specifically, the linear polarizing plate and the ⁇ / 4 plate are usually arranged such that the angle between the slow axis of the ⁇ / 4 plate and the transmission axis of the linear polarizing plate is 45 °.
  • An adhesive layer may be disposed between the film formed by fixing the cholesteric liquid crystal phase and the ⁇ / 4 plate.
  • the laminate of the present invention can be used for known applications as in the film of the present invention described above, and specifically, a decorative film, a concealing member of the photographing device or the sensor, or a combiner of the head-up display It can be used for etc.
  • composition for forming alignment film Each component shown below was mixed and the composition for alignment film formation whose solid content concentration is 33 mass% was prepared.
  • KAYARAD PET-30 (trade name, manufactured by Nippon Kayaku Co., Ltd.): 100 parts by mass
  • Surfactant b (the following structure): 0.01 parts by mass
  • IRGACURE 819 (manufactured by BASF, photo radical initiator): 4 parts by mass methyl ethyl ketone ( MEK): 211.2 parts by mass
  • Polymerizable liquid crystal composition 1 having a solid content concentration of 42% by mass.
  • Polymerizable liquid crystal compound A 100 parts by mass Chiral agent a (the above structure): 4.35 parts by mass Irgacure OXE-01 (manufactured by BASF, photo radical initiator): 1.00 parts by mass Surfactant a (The above structure): 0.11 parts by mass Surfactant b (the above structure): 0.02 parts by mass MEK / cyclohexanone: 144 parts by mass
  • Example 1 The above composition for forming an alignment film is coated on a base film (polyethylene terephthalate (PET) film, trade name "Cosmo Shine A4100, manufactured by Toyobo Co., Ltd., film thickness 25 ⁇ m) with a coating bar # 7, and 90 Dry at 1 ° C for 1 minute. Then, UV (ultraviolet) irradiation is performed so that the exposure amount (irradiation amount) becomes 250 mJ in a 60 ° C. atmosphere in which the inside of the system is replaced with nitrogen for 30 seconds to cure the coating film, and the film thickness on the PET film An alignment film of 2.0 ⁇ m was formed.
  • PET polyethylene terephthalate
  • the polymerizable liquid crystal composition 1 was coated on the alignment film with a coating bar # 5, and the coated film was dried at room temperature (25 ° C.) for 1 minute.
  • the coating amount was adjusted so that the film thickness of the layer obtained by immobilizing the cholesteric liquid crystal phase to be obtained was 3.0 ⁇ m.
  • the mask 1 is placed at a position 25 cm away from the exposed surface of the bench top UV transilluminator (manufactured by UVP), and the film on which the coating of the polymerizable liquid crystal composition 1 is formed is placed thereon.
  • the first exposure irradiation wavelength 365 nm, irradiation amount 45 mJ was performed on the coating film of the polymerizable liquid crystal composition 1 through 1.
  • the coating film of the polymerizable liquid crystal composition 1 exposed in a pattern is heated for 1 minute in an oven at an internal temperature of 90 ° C., and then nitrogen substitution is performed for 30 seconds on a hot plate at 80 ° C.
  • Exposure irradiation wavelength: 315 nm, irradiation dose: 500 mJ
  • the entire surface was exposed without using a mask.
  • the mask 1 is a photomask in which a transmitting portion having a minor diameter of 100 ⁇ m and a light shielding portion having a minor diameter of 100 ⁇ m are arranged in a stripe shape as one cycle. Therefore, in Example 1, a film having a pattern as shown in FIG. 1 is formed.
  • Example 2 The PET film used as the base film of Example 1 was changed to the mask 1 itself, and an alignment film was formed on the mask 1 in the same manner as in Example 1. Then, after forming a coating film of the polymerizable liquid crystal composition 1 on the alignment film, without using the mask 1 inserted between the exposure device and the coated film at the first exposure, the first exposure amount was changed to 30 mJ, and in the same manner as in Example 1, a layer (film) formed by fixing a patterned cholesteric liquid crystal phase was formed on the mask 1.
  • Example 3 The alignment film was not applied to the PET film used as the base film of Example 1, and the flat surface (the uncoated surface of the adhesion layer) was rubbed (spacer: 2.0 mm, rotational speed: 1000 rpm, stage moving speed: A layer (film) obtained by immobilizing the patterned cholesteric liquid crystal phase on the base film was formed in the same manner as in Example 1 except that 3.0 m / min) was performed.
  • Example 4 The base film used in Example 1 is changed to a PET film (trade name “Cosmo Shine A4100”, manufactured by Toyobo Co., Ltd.) with a film thickness of 75 ⁇ m, and mask 1 is changed to mask 2, and the first exposure dose is 30 mJ.
  • a layer (film) obtained by immobilizing a patterned cholesteric liquid crystal phase was formed on the alignment film formed on the base film in the same manner as in Example 1 except that the above was changed to.
  • the mask 2 is a photomask in which transmission portions of 200 ⁇ m square and light shielding portions of 200 ⁇ m square are alternately arranged in a checkered flag shape. That is, in Example 4, a film having a pattern as shown in FIG. 5 is formed.
  • Example 5 The base film used in Example 1 was changed to a PET film (trade name "Cosmo Shine A4100", manufactured by Toyobo Co., Ltd.) with a film thickness of 75 ⁇ m, and mask 1 was changed to mask 3, and the first exposure was 30 mJ. A layer (film) obtained by immobilizing a patterned cholesteric liquid crystal phase was formed on the alignment film formed on the base film in the same manner as in Example 1 except that the above was changed to.
  • the mask 3 is a photomask in which transmission portions having a minor diameter of 200 ⁇ m and light shielding portions having a minor diameter of 200 ⁇ m are alternately arranged in stripes.
  • Example 6 A layer obtained by immobilizing a patterned cholesteric liquid crystal phase on an alignment film formed on a base film in the same manner as in Example 1 except that the first exposure dose in Example 1 was changed to 60 mJ Formed.
  • Example 7 The orientation formed on the base film in the same manner as in Example 1 except that the base film used in Example 1 was changed to a PET film (trade name “Cosmo Shine A4100”, manufactured by Toyobo Co., Ltd.) having a film thickness of 75 ⁇ m. A layer (film) was formed on the film by immobilizing the patterned cholesteric liquid crystal phase.
  • the minor axis size of the area of the transmitting portion and the minor axis size of the area of the light shielding portion of each film of Examples 1 to 7 are the same as the minor axis size of the transmitting portion and the minor axis size of the light shielding portion, respectively. Or it was smaller than that.
  • Comparative Example 1 The patterned cholesteric liquid crystal phase is immobilized on the alignment film formed on the base film in the same manner as in Example 1 except that the distance from the exposure surface of the bench top UV transilluminator to the mask is changed to 35 cm. The film layer was formed.
  • Comparative Example 2 A layer obtained by immobilizing a patterned cholesteric liquid crystal phase on an alignment film formed on a base film in the same manner as in Example 1 except that the first exposure dose in Example 1 was changed to 90 mJ Formed.
  • Comparative Example 3 Patterning was performed on the alignment film formed on the base film in the same manner as in Example 1 except that the mask 1 used in Example 1 was changed to Mask 4 and the first exposure dose was changed to 30 mJ. A layer (film) formed by immobilizing the cholesteric liquid crystal phase is formed.
  • the mask 4 is a photomask in which transmitting portions having a minor axis width of 300 ⁇ m and light shielding portions having a minor axis width of 100 ⁇ m are alternately arranged in stripes.
  • Comparative Example 4 In the same manner as in Example 1, an alignment film was formed on a base film (polyethylene terephthalate (PET) film, trade name “Cosmo Shine A4100, manufactured by Toyobo Co., Ltd., film thickness 25 ⁇ m). Next, the polymerizable liquid crystal composition 2 was coated on the alignment film with a coating bar # 5, and the coated film was dried at room temperature (25 ° C.) for 1 minute. Furthermore, after heating the coating film of the polymerizable liquid crystal composition 2 for 1 minute using an oven with an internal temperature of 90 ° C., the inside of the system is purged with nitrogen for 30 seconds while heating the coating film on a hot plate at 80 ° C.
  • PET polyethylene terephthalate
  • a monochromatic layer (film) having a cholesteric liquid crystal phase (hereinafter, also referred to as “first layer”) on the alignment film formed on the base film. Formed.
  • a monochrome layer (film) having a cholesteric liquid crystal phase on the first layer in the same manner as the formation of the first layer except that the polymerizable liquid crystal composition 3 is used (hereinafter referred to as “second layer”) (Also referred to as
  • second layer a film formed by immobilizing the cholesteric liquid crystal phase in which the first layer and the second layer were laminated in this order was formed.
  • Comparative Example 5 Patterning was performed on the alignment film formed on the base film in the same manner as in Example 1 except that the mask 1 used in Example 1 was changed to the mask 5 and the first exposure dose was changed to 30 mJ. A layer (film) formed by immobilizing the cholesteric liquid crystal phase is formed.
  • the mask 5 is a photomask in which transmitting portions having a minor axis size of 300 ⁇ m and light shielding portions having a minor axis size of 300 ⁇ m are alternately arranged in stripes.
  • the minor axis size of the region of the transmissive portion and the minor axis size of the region of the light shielding portion included in the films of Comparative Examples 1 to 3 and Comparative Example 5 are the minor diameter size of the transmissive portion and the short side of the light shielding portion, respectively. It was the same as or smaller than the diameter size. However, in each film of Comparative Example 3 and Comparative Example 5, a region having a minor axis size larger than 200 ⁇ m was formed.
  • the xy chromaticity was calculated using the above measured spectrum.
  • the distance from neutral was calculated using the equation ⁇ (x ⁇ 0.3127) 2 + (y ⁇ 0.3290) 2 ⁇ 0.5 as white).
  • the distance from neutral is less than 0.04, it is evaluated as “A”, if it is 0.04 to 0.06, it is evaluated as “B”, and if it exceeds 0.06, it is evaluated as “C”.
  • Table 1 The evaluation of The results are shown in Table 1.
  • the film formed by fixing the cholesteric liquid crystal phase has a plurality of regions in which the selective reflection center wavelength is different in the in-plane direction, and the size of the minor diameter of each of the plurality of regions is a predetermined value or less If the film has a maximum value of reflectance at a predetermined wavelength and the relationship of reflectance at a predetermined wavelength satisfies the predetermined relationship, white reproducibility and visual recognition when the surface of the film is viewed from the front, It was confirmed that the properties were excellent (Examples 1 to 7).

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Optical Filters (AREA)
  • Instrument Panels (AREA)
  • Studio Devices (AREA)

Abstract

La présente invention a pour objet de fournir un film obtenu par fixation d'une phase cristal liquide cholestérique, le film présentant une excellente reproductibilité blanche lorsque la surface du film est vue depuis l'avant et présentant également une excellente visibilité. L'invention concerne en outre un dispositif d'imagerie, un capteur et un dispositif d'affichage tête haute comprenant un tel film. Le film selon l'invention est obtenu par fixation d'une phase cristal liquide cholestérique et comporte une pluralité de régions dans lesquelles les longueurs d'onde centrales de réflexion sélective sont différentes dans la direction dans le plan du film, le diamètre mineur de chacune de la pluralité de régions étant de 200 µm ou moins. Chacune de deux régions de longueur d'onde prédéfinie a une seule valeur maximale de réflectance. En supposant que la valeur maximale, la valeur minimale et la valeur maximale du facteur de réflexion dans trois régions de longueur d'onde prédéfinie sont ImaxX, IminY, et ImaxZ respectivement, toutes les relations suivantes sont satisfaites : ImaxX/ImaxZ > 1, IminY/ImaxX > 0,3, et IminY/ImaxZ > 0,5.
PCT/JP2019/000355 2018-01-16 2019-01-09 Film, stratifié, dispositif d'imagerie, capteur et dispositif d'affichage tête haute WO2019142707A1 (fr)

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WO2021033631A1 (fr) * 2019-08-16 2021-02-25 富士フイルム株式会社 Procédé de production de couche anisotrope optique, procédé de production de stratifié, procédé de production de couche anisotrope optique équipée d'un polariseur, procédé de production de stratifié équipé d'un polariseur, composition et couche anisotrope optique
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WO2023286777A1 (fr) * 2021-07-15 2023-01-19 富士フイルム株式会社 Feuille décorative, corps décoratif, dispositif électronique et élément décoratif

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JPWO2020071221A1 (ja) * 2018-10-03 2021-09-02 富士フイルム株式会社 画像形成装置及び画像形成方法
JP7052065B2 (ja) 2018-10-03 2022-04-11 富士フイルム株式会社 画像形成装置及び画像形成方法
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JP7434336B2 (ja) 2019-08-16 2024-02-20 富士フイルム株式会社 光学異方性層の製造方法、積層体の製造方法、偏光子付き光学異方性層の製造方法、偏光子付き積層体の製造方法、組成物、光学異方性層
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JP7309919B2 (ja) 2019-12-25 2023-07-18 富士フイルム株式会社 積層体及びその製造方法、成型物及びその製造方法、電子デバイスの筐体パネル、並びに電子デバイス
WO2022190936A1 (fr) * 2021-03-12 2022-09-15 富士フイルム株式会社 Composition polymérisable et film décoratif
WO2023286777A1 (fr) * 2021-07-15 2023-01-19 富士フイルム株式会社 Feuille décorative, corps décoratif, dispositif électronique et élément décoratif

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