WO2014097895A1 - Cristaux liquides cholestériques à plusieurs couches, procédé de fabrication associé et stratifié de cristaux liquides cholestériques à plusieurs couches - Google Patents

Cristaux liquides cholestériques à plusieurs couches, procédé de fabrication associé et stratifié de cristaux liquides cholestériques à plusieurs couches Download PDF

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WO2014097895A1
WO2014097895A1 PCT/JP2013/082726 JP2013082726W WO2014097895A1 WO 2014097895 A1 WO2014097895 A1 WO 2014097895A1 JP 2013082726 W JP2013082726 W JP 2013082726W WO 2014097895 A1 WO2014097895 A1 WO 2014097895A1
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liquid crystal
cholesteric liquid
layer
group
light reflecting
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PCT/JP2013/082726
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English (en)
Japanese (ja)
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峻也 加藤
靖浩 久保田
中島　正雄
和宏 沖
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富士フイルム株式会社
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Priority to CN201380065920.5A priority Critical patent/CN104871046A/zh
Priority to KR1020157014024A priority patent/KR101766102B1/ko
Publication of WO2014097895A1 publication Critical patent/WO2014097895A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/26—Reflecting filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks

Definitions

  • the present invention relates to a cholesteric liquid crystal laminate, a method for producing the same, and a combination of cholesteric liquid crystal laminates. More specifically, a cholesteric liquid crystal layered structure in which cholesteric liquid crystal layers with left and right reverse twist are laminated in contact with each other without using an adhesive, has a good surface shape, high transparency, and selective reflection characteristics in the visible light region, and The present invention relates to a manufacturing method thereof, and a combination of cholesteric liquid crystal laminates having a plurality of the cholesteric liquid crystal laminates.
  • a reflective film obtained by curing cholesteric liquid crystal reflects one circularly polarized light and transmits the other light. Visible light can be reflected by shortening the pitch of the cholesteric liquid crystal to some extent.
  • a technique for reflecting both lights using a cholesteric liquid crystal film a technique is known in which a 1 ⁇ 2 ⁇ plate is sandwiched between two identical cholesteric liquid crystal layers, and the transmitted light is converted into a reverse circularly polarized light. Yes. This method has a drawback that light leakage occurs depending on the wavelength when the wavelength dispersion of the 1 ⁇ 2 ⁇ plate is not a wide band.
  • a method in which at least two cholesteric liquid crystal layers having the same selective reflection wavelength and different torsional senses are stacked.
  • a method of laminating at least two cholesteric liquid crystal layers having the same selective reflection wavelength and different torsional senses a method of installing cholesteric liquid crystals having different torsional senses on the front and back sides of the base material, A method of using an adhesive material between layers when laminating a cholesteric liquid crystal layer and a method of directly laminating another cholesteric liquid crystal layer on a cholesteric liquid crystal layer have been known.
  • Patent Document 1 a method described in Patent Document 1 is known as a method of using an adhesive material between layers when laminating a cholesteric liquid crystal layer having a left twist and a right twist.
  • Patent Document 1 by using an optical element formed by laminating a cholesteric layer having a Grandian orientation, the selective reflection wavelength region of circularly polarized light is the same, and the left and right of selectively selectively reflected circularly polarized light are reversed.
  • Patent Document 1 describes an example and a drawing in which an adhesive material is used when laminating cholesteric liquid crystals having different twist pitches on the left and right sides, and the paragraph [0015] of the same document describes a cholesteric liquid crystal layer having a spiral direction reversed. There is a description that the superposed layer can be separately formed through a transparent adhesive layer such as an adhesive layer.
  • Patent Document 1 does not describe HTP as a chiral agent, and does not describe the amount of chiral agent added in Examples.
  • the substrate can be removed and the film can be thinned, and examples relating to infrared light reflection are known.
  • examples relating to infrared light reflection are known.
  • another cholesteric liquid crystal layer is directly stacked on the cholesteric liquid crystal layer and the visible light region is reflected. It was not known.
  • Patent Document 2 A technique for realizing broadband reflection by a tilting method is known (for example, see Patent Document 2).
  • Patent Document 2 a cholesteric liquid crystal layer in the visible light region is laminated without using an adhesive material, but the right and left chiral agents have clearly small HTPs.
  • the method of inclining by changing the pitch in the cholesteric layer in the thickness direction requires precise control of the polymerization rate of the chiral agent or the liquid crystal compound, and has a disadvantage that the yield is low.
  • precise control of the polymerization rate is required twice, resulting in poor productivity.
  • Patent Document 1 Under such circumstances, as a method of laminating at least two cholesteric liquid crystal layers having different torsional senses, an adhesive material is used between the layers when laminating the left-handed and right-twisted cholesteric liquid crystal layers described in Patent Document 1.
  • an adhesive material is used between the layers when laminating the left-handed and right-twisted cholesteric liquid crystal layers described in Patent Document 1.
  • the present inventors examined about the case where a method is employ
  • the problem to be solved by the present invention is that the cholesteric liquid crystal layers of oppositely twisted left and right are laminated in contact with each other without using an adhesive material, have a good surface shape, high transparency, and selective reflection characteristics in the visible light region. It is to provide a cholesteric liquid crystal laminate having high reflection performance.
  • the present inventors are not bound to any theory by using a chiral agent having a high HTP, but the liquid crystallinity of the composition is reduced by the addition of a large amount of the chiral agent.
  • the cholesteric liquid crystal composition that maintains moderate liquid crystallinity, the cholesteric liquid crystal layer with the right-and-left reverse twist is neatly laminated with no defects or streaks in a good surface state, and is highly transparent and has high reflective performance It has been found that a high visible light reflection film can be provided.
  • HTP is generally used as an index representing the performance of a chiral agent.
  • HTP is an abbreviation for Helical Twisting Power, and is a factor indicating the helical orientation ability represented by the following formula.
  • Non-Patent Document 1 “Development of photoreactive chiral agent for cholesteric liquid crystal for color filter for liquid crystal display” (Yoshitomo Yumoto, Mitsuyoshi Ichihashi).
  • HTP 1 / (mass% concentration of chiral agent in solid content of liquid crystal composition ⁇ helical pitch length)
  • helical pitch length selective reflection wavelength / average refractive index of solid content of liquid crystal composition
  • the cholesteric liquid crystal laminate according to [1] further includes a base material, and the base material, at least one light reflection layer Xa, and at least one light reflection layer Xb are arranged in this order. It is preferred that [3] In the cholesteric liquid crystal laminate according to [1] or [2], the left-turning chiral agent is preferably represented by the following general formula (1) or the following general formula (2). (In the general formula (1), M each independently represent a hydrogen atom or a substituent, R 1 represents any one of the linking groups shown below.
  • R 3 each independently represents an alkyl group having 1 to 3 carbon atoms or an aryl group having 6 to 10 carbon atoms.
  • R 2 represents any of the following substituents, and two R 2 may be the same or different from each other.
  • * represents the coupling
  • Y 1 represents each independently a single bond, —O—, —C ( ⁇ O) O—, —OC ( ⁇ O) —, —OC ( ⁇ O) O—, and Sp 1 represents each independently A single bond or an alkylene group having 1 to 8 carbon atoms
  • Z 1 independently represents a hydrogen atom or a (meth) acryl group
  • n represents an integer of 1 or more.
  • the cholesteric liquid crystal laminate according to any one of [1] to [4] preferably includes the light reflecting layer Xa and the light reflecting layer Xb one by one.
  • the cholesteric liquid crystal laminate according to any one of [1] to [4] has at least one of the light reflecting layer Xa and the light reflecting layer Xb, and includes all the light It is preferable that all the chiral agents contained in the reflective layer Xa are the same, and all the chiral agents contained in all the light reflective layers Xb are the same.
  • the cholesteric liquid crystal laminate according to any one of [1] to [4] and [6] includes two sets of the light reflection layer Xa and the light reflection layer Xb.
  • the selective reflection wavelengths of the light reflection layer Xa and the light reflection layer Xb included in each set are equal to each other, and the selective reflection wavelengths of the light reflection layers Xa included in different sets are different from each other. It is preferable that the selective reflection wavelengths of the light reflection layers Xb included in the set are different from each other.
  • the haze of the cholesteric liquid crystal laminate is preferably 1% or less.
  • the cholesteric liquid crystal laminate according to any one of [1] to [8] further includes at least one of an easy adhesion layer, a hard coat layer, an ultraviolet absorption layer, an adhesive layer, and a surface protective layer. It is preferable.
  • the cholesteric liquid crystal laminate according to any one of [1] to [9] preferably has a maximum transmittance of 10% or less in the range of 420 to 680 nm.
  • the cholesteric liquid crystal laminate according to any one of [1] to [10] has a maximum transmittance of 10% or less in the range of 450 to 500 nm and in the range of 600 to 660 nm.
  • the transmittance is preferably 20% or more.
  • the cholesteric liquid crystal laminate combination according to [12] preferably has a maximum transmittance of 10% or less in the range of 420 to 680 nm.
  • the maximum transmittance in the range of 450 to 500 nm and in the range of 600 to 660 nm is 10% or less, and the transmittance at 550 nm is 20% or more. It is preferable that
  • a coating film is formed by coating using a polymerizable liquid crystal composition for the light reflection layer Xa containing a rod-like liquid crystal compound and a right-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more, and the light reflection Heat is applied to the polymerizable liquid crystal composition for layer Xa to form a cholesteric liquid crystal phase, and the polymerizable liquid crystal composition for light reflection layer Xa is irradiated with actinic radiation to fix the cholesteric liquid crystal phase to at least one layer.
  • Forming a light reflection layer Xa of A coating film is formed by coating using a rod-like liquid crystal compound, a polymerizable liquid crystal composition for light reflection layer Xb containing a left-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more, and the light reflection layer Xb Heat is applied to the polymerizable liquid crystal composition to form a cholesteric liquid crystal phase, and the polymerizable liquid crystal composition for the light reflecting layer Xb is irradiated with actinic radiation to fix the cholesteric liquid crystal phase to at least one light reflecting layer.
  • the selective reflection wavelengths of all the light reflection layers Xa and all the light reflection layers Xb are in the range of 400 nm to 750 nm, and the selective reflection wavelength of at least one layer of the light reflection layer Xa and at least one layer of the light reflection layer
  • the selective reflection wavelengths of Xb are equal to each other, and the polymerizable liquid crystal composition for the upper light reflection layer is made of the lower light reflection layer so that the light reflection layers formed by fixing all adjacent cholesteric liquid crystal phases are in contact with each other.
  • the cholesteric liquid crystal layers with oppositely twisted left and right layers are laminated in contact with each other without using an adhesive material, have a good surface shape, high transparency, and have a selective reflection characteristic in the visible light region.
  • a high-performance cholesteric liquid crystal laminate can be provided.
  • a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • the cholesteric liquid crystal laminate of the present invention is a light reflecting layer formed by fixing a cholesteric liquid crystal phase, and includes at least one light reflecting layer containing a right-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more.
  • the selective reflection wavelengths of the light reflection layer Xa and all of the light reflection layers Xb are in the range of 400 nm to 750 nm, and the selective reflection wavelength of at least one light reflection layer Xa and the light reflection layer Xb of at least one layer.
  • the selective reflection wavelengths are equal to each other, and light reflection layers formed by fixing all adjacent cholesteric liquid crystal phases are laminated in contact with each other.
  • the cholesteric liquid crystal laminate of the present invention is formed by laminating cholesteric liquid crystal layers with oppositely twisted sides in contact with each other without using an adhesive material, having a good surface shape, high transparency, and a visible light region. Have selective reflection characteristics and high reflection performance.
  • a more preferable aspect of the cholesteric liquid crystal laminate of the present invention will be specifically described.
  • the haze of the cholesteric liquid crystal laminate is preferably 1% or less, more preferably 0.5% or less, and particularly preferably 0.4% or less.
  • FIG. 1 is a schematic view showing an example of a cholesteric liquid crystal laminate according to the present invention, in which a light reflecting layer Xa (14a) formed by fixing a cholesteric liquid crystal layer and a cholesteric liquid crystal layer are fixed on a substrate 12.
  • the light reflection layers Xb (14b) are stacked, and the light reflection layers formed by fixing all the adjacent cholesteric liquid crystal phases are arranged in contact with each other.
  • the light reflection layer Xa and the light reflection layer Xb are each one layer
  • the light reflection layer Xa (14a) and the light reflection layer Xb (14b) are disposed in contact with each other.
  • the light reflecting layer Xa (14a) and the base material 12 may be adjacent to each other or may be laminated via another layer. Examples of the other layers include other light reflecting layers described later, an alignment layer, and an undercoat layer.
  • the cholesteric liquid crystal laminate of the present invention includes the substrate, the light reflecting layer Xa (containing a right-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more) and the light.
  • the reflection layer Xb (containing a left-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more) is arranged in this order, so that the light reflection layer containing the right-turning chiral agent is in the lower layer.
  • the cholesteric liquid crystal laminate of the present invention has at least one light reflecting layer Xa and at least one light reflecting layer Xb as a light reflecting layer formed by fixing a cholesteric liquid crystal phase.
  • the light reflecting layer Xa is a light reflecting layer formed by fixing a cholesteric liquid crystal phase
  • the light reflecting layer Xa contains a right-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more
  • the selective reflection wavelength of the reflective layer Xa is in the range of 400 nm to 750 nm.
  • the light reflection layer Xb is a light reflection layer formed by fixing a cholesteric liquid crystal phase.
  • the light reflection layer Xb contains a left-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more, and all the light reflection layers
  • the selective reflection wavelength of the layer Xb is in the range of 400 nm to 750 nm.
  • the selective reflection wavelength of at least one light reflection layer Xa is equal to the selective reflection wavelength of at least one light reflection layer Xb.
  • the left and right of the same wavelength are used.
  • the selective reflection wavelength of the light reflection layer is a half-value transmittance represented by the following formula: T 1/2 (%), where Tmin (%) is the minimum value of the transmittance in the light reflection layer. The average value of two wavelengths.
  • T 1/2 100 ⁇ (100 ⁇ Tmin) ⁇ 2
  • T 1/2 100 ⁇ (100 ⁇ Tmin) ⁇ 2
  • selective reflection wavelengths of the light reflecting layer“ is not equal to each other ” does not mean that they are strictly equal, and an error in a range that does not affect optically is allowed.
  • the selective reflection wavelengths of the two light reflecting layers are “equal to each other” means that the difference between the selective reflection wavelengths of the two light reflecting layers is 20 nm or less, and the difference is 15 nm or less. Is preferable, and it is more preferable that it is 10 nm or less.
  • At least one of the light reflecting layer Xa and the light reflecting layer Xb has a maximum value of reflectance at 40 nm to 750 nm of 40% or more, and 45% or more. It is more preferable. All of the light reflecting layers Xa and all of the light reflecting layers Xb preferably have a maximum reflectance of 40% or more at 400 nm to 750 nm, and more preferably 45% or more.
  • the cholesteric liquid crystal laminate of the present invention has a light reflecting layer (hereinafter referred to as “light reflecting layer”) in which other cholesteric liquid crystal phases other than the light reflecting layer Xa and the light reflecting layer Xb are fixed. And other light reflecting layers).
  • the cholesteric liquid crystal laminate of the present invention preferably includes the light reflecting layer Xa and the light reflecting layer Xb one by one, has the light reflecting layer Xa and the light reflecting layer Xb one by one, and It is preferable not to have a light reflection layer formed by fixing other cholesteric liquid crystal phases other than the light reflection layer Xa and the light reflection layer Xb.
  • points common to the light reflection layer Xa, the light reflection layer Xb, and other light reflection layers are described as explanations of “each light reflection layer”.
  • the number of light reflection layers formed by fixing the other cholesteric liquid crystal phases is not particularly limited, and may be, for example, 0 to 10 layers, preferably 0 to 8 layers, and more preferably 0 to 6 layers. In addition, it is preferable from a viewpoint of film thickness to make another light reflection layer into 0 layer. There is no restriction
  • the cholesteric liquid crystal laminate of the present invention has at least one of the light reflection layer Xa and the light reflection layer Xb, the chiral agents of all the light reflection layers Xa and all the light reflection layers Xb are used. It is preferable from the viewpoint of cost effectiveness due to the common use of members.
  • FIG. 2 is a schematic view showing another example of the cholesteric liquid crystal laminate of the present invention in the case where at least one of the light reflecting layer Xa and the light reflecting layer Xb is two or more.
  • a light reflecting layer Xa (14a) formed by fixing a cholesteric liquid crystal layer, a light reflecting layer Xa (16a) formed by fixing a cholesteric liquid crystal layer, and a cholesteric liquid crystal layer are fixed on a substrate 12.
  • the light reflection layer Xb (14b) and the light reflection layer Xb (16b) formed by fixing the cholesteric liquid crystal layer are laminated, and the light reflection layer Xa (14a) and the light reflection layer Xa (16a) are in contact with each other.
  • the light reflecting layer Xa (16a) and the light reflecting layer Xb (14b) are disposed in contact with each other, and the light reflecting layer Xb (14b) and the light reflecting layer Xb (16b) are disposed in contact with each other.
  • the total number of layers of the light reflection layer Xa is not particularly limited as long as the selective reflection wavelengths of all the light reflection layers Xa are in the range of 400 to 750 nm, but preferably 1 to 10 layers, for example. More preferably, it is preferably 5 layers, and more preferably 1 layer. In FIG. 2, the light reflecting layer Xa has two layers.
  • the total number of layers of the light reflection layer Xb is not particularly limited as long as the selective reflection wavelengths of all the light reflection layers Xb are in the range of 400 to 750 nm, but preferably 1 to 10 layers, for example. More preferably, it is preferably 5 layers, and more preferably 1 layer.
  • the light reflecting layer Xb has two layers.
  • the total number of layers of the light reflection layer Xa and the total number of layers of the light reflection layer Xb are independent of each other and may be the same or different, but are preferably the same.
  • the cholesteric liquid crystal laminate of the present invention may have two or more sets each composed of one layer of the light reflecting layer Xa and one layer of the light reflecting layer Xb.
  • the selective reflection wavelengths of the light reflection layer Xa and the light reflection layer Xb included in each set are equal to each other.
  • the selective reflection wavelengths of the respective light reflection layers Xa are different from each other, but there are a plurality of the light reflection layers Xa having the same selective reflection wavelength.
  • the reflection efficiency is not high, which is preferable from the viewpoint of economic factors such as manufacturing costs.
  • that the selective reflection wavelengths of the two light reflection layers are different from each other means that the difference between the two selective reflection wavelengths exceeds at least 20 nm.
  • the difference in selective reflection wavelength between the light reflecting layers Xa is preferably more than 20 nm, more preferably 30 nm or more, and particularly preferably 40 nm or more.
  • the selective reflection wavelengths of the light reflection layers Xb are different from each other.
  • the difference in selective reflection wavelength between the light reflecting layers Xb is preferably more than 20 nm, more preferably 30 nm or more, and particularly preferably 40 nm or more.
  • the cholesteric liquid crystal laminate of the present invention has two or more sets each composed of one layer of the light reflecting layer Xa and one layer of the light reflecting layer Xb, the light reflecting layer Xa included in different groups. It is more preferable that the selective reflection wavelengths of the light reflection layers Xb included in different sets are different from each other.
  • the cholesteric liquid crystal laminate of the present invention has two or more sets each composed of one layer of the light reflecting layer Xa and one layer of the light reflecting layer Xb, and the light reflecting layer Xa and The selective reflection wavelengths of the light reflection layers Xb are equal to each other, the selective reflection wavelengths of the light reflection layers Xa included in different sets are different from each other, and the selective reflection wavelengths of the light reflection layers Xb included in different sets are different from each other. It is particularly preferred.
  • the light reflection layer obtained by fixing the cholesteric liquid crystal phase other than the light reflection layer Xa and the light reflection layer Xb has a maximum value of reflectance of 40% or more at 400 nm to 750 nm. It is preferable that it is 45% or more.
  • the maximum transmittance in the range of 420 to 680 nm is preferably 10% or less from the viewpoint of efficiently reflecting light with high human visibility.
  • the cholesteric liquid crystal laminate of the present invention has a special filter having a maximum transmittance of 10% or less and a transmittance of 550 nm of 20% or more in the range of 450 to 500 nm and 600 to 660 nm. It is preferable from the viewpoint of utilization. In the case of such characteristics, the cholesteric liquid crystal laminate of the present invention has 2 to 10 pairs each composed of one layer of the light reflecting layer Xa and one layer of the light reflecting layer Xb.
  • the selective reflection wavelengths of the light reflection layer Xa and the light reflection layer Xb included in each are the same, and the selective reflection wavelengths of the light reflection layers Xa included in different sets are different from each other and included in the different sets. It is preferable that the selective reflection wavelengths of the layers Xb are different from each other, and it is more preferable that the layers each include 6 to 10 sets each including one light reflection layer Xa and one light reflection layer Xb. .
  • the cholesteric liquid crystal laminate of the present invention may be used by being integrated with another supporting member such as laminated glass.
  • a base material may be integrated with another support member with each light reflection layer, and a light reflection layer may be integrated with a support member by peeling a base material.
  • each light reflecting layer is about 1 ⁇ m to 8 ⁇ m (preferably about 2 to 7 ⁇ m). However, it is not limited to these ranges.
  • Each light reflecting layer having a desired helical pitch can be formed by adjusting the type and concentration of materials (mainly liquid crystal material and chiral agent) used for forming each light reflecting layer.
  • the thickness of each light reflection layer can be made into a desired range by adjusting the application amount. By reducing the thickness of the light reflecting layer, it is possible to intentionally reduce the reflectance and transmit a part of the light.
  • each light reflecting layer is preferably fixed by photopolymerization after applying and aligning a cholesteric liquid crystal composed of a polymerizable liquid crystal.
  • a polymerizable liquid crystal composition is preferably used for forming each light reflecting layer.
  • the polymerizable liquid crystal composition an embodiment containing at least a rod-like liquid crystal compound, a chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more, and a polymerization initiator is preferable. Two or more of each component may be included.
  • a polymerizable rod-like liquid crystal compound and a non-polymerizable rod-like liquid crystal compound can be used in combination. Also, a combination of a low-molecular liquid crystal compound and a high-molecular liquid crystal compound is possible.
  • a horizontal alignment agent a non-uniformity inhibitor, a repellency inhibitor, and a polymerizable monomer. May be.
  • a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, a colorant, metal oxide fine particles, and the like are added in a range that does not deteriorate the optical performance, if necessary. Can be added.
  • Rod-like liquid crystal compounds As rod-like liquid crystal compounds, azomethines, azoxys, cyanobiphenyls, cyanophenyl esters, benzoates, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted phenyl Pyrimidines, phenyldioxanes, tolanes and alkenylcyclohexylbenzonitriles are preferably used. In addition to the above low-molecular liquid crystalline molecules, high-molecular liquid crystalline molecules can also be used.
  • the polymerizable rod-like liquid crystal compound is preferably a polymerizable rod-like liquid crystal compound represented by the following general formula (X).
  • the polymerization reaction of the polymerizable group is preferably addition polymerization (including ring-opening polymerization) or condensation polymerization.
  • the polymerizable group is preferably a functional group capable of addition polymerization reaction or condensation polymerization reaction. Examples of polymerizable groups are shown below.
  • L 1 and L 4 are each independently a divalent linking group.
  • L 1 and L 4 each independently comprise —O—, —S—, —CO—, —NR—, —C ⁇ N—, a divalent chain group, a divalent cyclic group, and combinations thereof.
  • a divalent linking group selected from the group is preferred.
  • R is an alkyl group having 1 to 7 carbon atoms or a hydrogen atom.
  • R is preferably an alkyl group having 1 to 4 carbon atoms or a hydrogen atom, more preferably a methyl group, an ethyl group or a hydrogen atom, and most preferably a hydrogen atom.
  • bivalent coupling group which consists of a combination is shown below.
  • the left side is coupled to Q (Q 1 or Q 2 ), and the right side is coupled to Cy (Cy 1 or Cy 3 ).
  • L-1 —CO—O—divalent chain group —O— L-2: —CO—O—divalent chain group —O—CO— L-3: —CO—O—divalent chain group —O—CO—O— L-4: —CO—O—divalent chain group—O—divalent cyclic group— L-5: —CO—O—divalent chain group —O—divalent cyclic group —CO—O— L-6: —CO—O—divalent chain group —O—divalent cyclic group —O—CO— L-7: —CO—O—Divalent chain group—O—Divalent cyclic group—Divalent chain group— L-8: —CO—O—divalent chain group—O—divalent cyclic group—divalent chain group —CO—O— L-9: —CO—O—Divalent chain group—O—Divalent cyclic group—Divalent chain group—O—CO— L-10: —CO
  • the divalent chain group means an alkylene group, a substituted alkylene group, an alkenylene group, a substituted alkenylene group, an alkynylene group, or a substituted alkynylene group.
  • An alkylene group, a substituted alkylene group, an alkenylene group and a substituted alkenylene group are preferred, and an alkylene group and an alkenylene group are more preferred.
  • the alkylene group may have a branch.
  • the alkylene group preferably has 1 to 12 carbon atoms, more preferably 2 to 10 carbon atoms, and most preferably 2 to 8 carbon atoms.
  • the alkylene part of the substituted alkylene group is the same as the above alkylene group.
  • the substituent examples include a halogen atom.
  • the alkenylene group may have a branch.
  • the alkenylene group preferably has 2 to 12 carbon atoms, more preferably 2 to 10 carbon atoms, and most preferably 2 to 8 carbon atoms.
  • the alkylene part of the substituted alkylene group is the same as the above alkylene group.
  • Examples of the substituent include a halogen atom.
  • the alkynylene group may have a branch.
  • the alkynylene group preferably has 2 to 12 carbon atoms, more preferably 2 to 10 carbon atoms, and most preferably 2 to 8 carbon atoms.
  • the alkynylene part of the substituted alkynylene group is the same as the above alkynylene group.
  • substituents include a halogen atom.
  • divalent chain group include ethylene, trimethylene, propylene, tetramethylene, 2-methyl-tetramethylene, pentamethylene, hexamethylene, octamethylene, 2-butenylene, 2-butynylene and the like.
  • divalent cyclic group is the same as those of Cy 1 , Cy 2 and Cy 3 described later.
  • L 2 or L 3 each independently represents a single bond or a divalent linking group.
  • L 2 and L 3 each independently comprises —O—, —S—, —CO—, —NR—, —C ⁇ N—, a divalent chain group, a divalent cyclic group, and combinations thereof. It is preferably a divalent linking group or a single bond selected from the group.
  • R is an alkyl group having 1 to 7 carbon atoms or a hydrogen atom, preferably an alkyl group having 1 to 4 carbon atoms or a hydrogen atom, and more preferably a methyl group, an ethyl group or a hydrogen atom. Preferably, it is a hydrogen atom.
  • the divalent chain group and the divalent cyclic group are synonymous with the definitions of L 1 and L 4 .
  • Preferred divalent linking groups for L 2 or L 3 include —COO—, —OCO—, —OCOO—, —OCONR—, —COS—, —SCO—, —CONR—, —NRCO—, —CH 2. CH 2 —, —C ⁇ C—COO—, —C ⁇ N—, —C ⁇ N—N ⁇ C—, and the like.
  • n is 0, 1, 2, or 3.
  • two L 3 may be the same or different, and two Cy 2 may be the same or different.
  • n is preferably 1 or 2, and more preferably 1.
  • Cy 1 , Cy 2 and Cy 3 are each independently a divalent cyclic group.
  • the ring contained in the cyclic group is preferably a 5-membered ring, a 6-membered ring, or a 7-membered ring, more preferably a 5-membered ring or a 6-membered ring, and most preferably a 6-membered ring.
  • the ring contained in the cyclic group may be a condensed ring. However, it is more preferably a monocycle than a condensed ring.
  • the ring contained in the cyclic group may be any of an aromatic ring, an aliphatic ring, and a heterocyclic ring.
  • Examples of the aromatic ring include a benzene ring and a naphthalene ring.
  • Examples of the aliphatic ring include a cyclohexane ring.
  • Examples of the heterocyclic ring include a pyridine ring and a pyrimidine ring.
  • As the cyclic group having a benzene ring 1,4-phenylene is preferable.
  • As the cyclic group having a naphthalene ring naphthalene-1,5-diyl and naphthalene-2,6-diyl are preferable.
  • the cyclic group having a cyclohexane ring is preferably 1,4-cyclohexylene.
  • cyclic group having a pyridine ring pyridine-2,5-diyl is preferable.
  • the cyclic group having a pyrimidine ring is preferably pyrimidine-2,5-diyl.
  • the cyclic group may have a substituent. Examples of the substituent include a halogen atom, a cyano group, a nitro group, an alkyl group having 1 to 5 carbon atoms, a halogen-substituted alkyl group having 1 to 5 carbon atoms, and an alkoxy group having 1 to 5 carbon atoms.
  • Examples of the polymerizable rod-like liquid crystal compound represented by the general formula (X) are shown below. The present invention is not limited to these.
  • the rod-like liquid crystal compound represented by the general formula (X) is preferably used in combination with at least one compound represented by the following general formula (V).
  • M 1 and M 2 are each independently a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a heterocyclic group, a cyano group, a halogen, —SCN, — CF3, nitro, or represent a Q 1, at least one of M 1 and M 2 represents a group other than Q 1.
  • Q 1 , L 1 , L 2 , L 3 , L 4 , Cy 1 , Cy 2 , Cy 3 and n have the same meaning as the group represented by the general formula (X).
  • P and q are 0 or 1.
  • M 1 and M 2 are preferably a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a cyano group, more preferably , An alkyl group having 1 to 4 carbon atoms, or a phenyl group, and p and q are preferably 0.
  • the compound represented by the general formula (V) in the mixture of the polymerizable liquid crystal compound represented by the general formula (X) and the compound represented by the general formula (V) It is 0.1% to 40%, more preferably 1% to 30%, and still more preferably 5% to 20%.
  • Chiral agent Cholesteric liquid crystal laminate of the present invention, the light reflecting layer Xa is contained right turn of the chiral agent is HTP is 30 [mu] m -1 or more, the left turn the light reflecting layer Xb is HTP is 30 [mu] m -1 or more Contains a chiral agent.
  • the chiral agent may be any of various known chiral agents (for example, Liquid Crystal Device Handbook, Chapter 3-4-3, TN, chiral agent for STN, 199 pages, edited by Japan Society for the Promotion of Science, 42nd Committee, 1989). ) Can be selected.
  • a chiral agent generally contains an asymmetric carbon atom, but an axially asymmetric compound or a planar asymmetric compound containing no asymmetric carbon atom can also be used as the chiral agent.
  • the axial asymmetric compound or the planar asymmetric compound include binaphthyl, helicene, paracyclophane, and derivatives thereof.
  • the chiral agent may have a polymerizable group. When the chiral agent has a polymerizable group and the rod-shaped liquid crystal compound used in combination also has a polymerizable group, it is derived from the rod-shaped liquid crystal compound by a polymerization reaction between the chiral agent having a polymerizable group and the polymerizable rod-shaped liquid crystal compound.
  • the polymerizable group possessed by the chiral agent having a polymerizable group is preferably the same group as the polymerizable group possessed by the polymerizable rod-like liquid crystal compound. Therefore, 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. Particularly preferred.
  • the chiral agent may be a liquid crystal compound.
  • the chiral agent is preferably 1 to 30 mol% with respect to the rod-shaped liquid crystal compound used in combination. A smaller amount of the chiral agent is preferred because it often does not affect liquid crystallinity. Therefore, the optically active compound used as the chiral agent is preferably a compound having a strong twisting power so that a twisted orientation with a desired helical pitch can be achieved even with a small amount. Examples of such a chiral agent exhibiting a strong twisting force include, for example, JP 2010-181852 A, JP 2003-287623 A, JP 2002-80851 A, JP 2002-80478 A, and JP 2002-80478 A. Examples include chiral agents described in JP-A No.
  • isosorbide compounds having a corresponding structure can be used for isosorbide compounds described in these publications, and isosorbide compounds having a corresponding structure can be used for isomannide compounds described in these publications. It can also be used.
  • the right-turning chiral agent a strong twisting force is provided to the market more than the left-turning chiral agent.
  • LC756 manufactured by BASF
  • the HTP of the right-turning chiral agent is preferably 40 ⁇ m ⁇ 1 or more, and more preferably 50 ⁇ m ⁇ 1 or more.
  • the left-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more is not particularly limited, and the chiral agent represented by the following general formulas (1) to (4) can be used even if known ones are used. It may be used.
  • the HTP of the left-turning chiral agent is preferably 33 ⁇ m ⁇ 1 or more, and more preferably 35 ⁇ m ⁇ 1 or more.
  • the left-turning chiral agent is preferably represented by the following general formula (1) or the following general formula (2), and is represented by the following general formula (3) or general formula (4).
  • M each independently represent a hydrogen atom or a substituent
  • R 1 represents any one of the linking groups shown below.
  • * represents the coupling
  • R 3 each independently represents an alkyl group having 1 to 3 carbon atoms or an aryl group having 6 to 10 carbon atoms.
  • R 2 represents any of the following substituents, and two R 2 may be the same or different from each other.
  • Y 1 represents each independently a single bond, —O—, —C ( ⁇ O) O—, —OC ( ⁇ O) —, —OC ( ⁇ O) O—
  • Sp 1 represents each independently A single bond or an alkylene group having 1 to 8 carbon atoms
  • Z 1 independently represents a hydrogen atom or a (meth) acryl group
  • n represents an integer of 1 or more.
  • R a represents one of the following linking groups.
  • * represents the coupling
  • Rb represents the substituent shown below, and two Rb may mutually be same or different.
  • * represents a bonding site with an oxygen atom in the general formula (4)
  • Y 2 represents a single bond, —O— or —OC ( ⁇ O) —
  • Sp 2 represents a single bond or the number of carbon atoms.
  • 1 to 8 represents an alkylene group
  • Z 2 represents a hydrogen atom or a (meth) acryl group.
  • each M independently represents a hydrogen atom or a substituent, and preferably represents a hydrogen atom, a halogen atom, or an alkyl group, alkynyl group, alkenyl group or alkyloxy group having 1 to 12 carbon atoms.
  • the CH 2 group in each group may be independently substituted with an O, S, OCO, COO, OCOO, CO or phenylene group.
  • the CH 2 group in the alkyl group, alkynyl group, alkenyl group or alkyloxy group having 1 to 12 carbon atoms is substituted with an O, S, OCO, COO, OCOO, CO or phenylene group
  • the position of the CH 2 group may be at the end of each group or inside each group.
  • M substantially represents a phenyl group.
  • M substantially represents an ethylcarbonyl group.
  • M substantially represents a propylthio group, and these substituents are all included in M satisfying the general formula (1).
  • alkyl group having 1 to 12 carbon atoms in which the CH 2 group is not substituted examples include linear, branched or cyclic alkyl groups such as a methyl group, an ethyl group, a propyl group, a butyl group, and a pentyl group. Hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group and cyclohexyl group.
  • alkyl group having 1 to 12 carbon atoms in which CH 2 group is substituted by S examples include methylthio group, ethylthio group, propylthio group, butylthio group, pentylthio group, hexylthio group, heptylthio group, octylthio group, nonylthio group, decylthio group And an undecylthio group.
  • the alkyl group having 1 to 12 carbon atoms in which the CH 2 group is substituted by OCO or COO is preferably a linear group having 2 to 6 C atoms.
  • the alkyl group having 1 to 12 carbon atoms in which the CH 2 group is substituted by OCOO may be linear or branched, but is preferably linear and is a known group. Can be used.
  • Examples of the alkyl group having 1 to 12 carbon atoms in which the CH 2 group is substituted with CO include carbonylmethyl group, carbonylethyl group, carbonylpropyl group, carbonylbutyl group, carbonylpentyl group, carbonylhexyl group, carbonylheptyl group, carbonyl Examples thereof include an octyl group, a carbonylnonyl group, a carbonyldecyl group, and a carbonylundecyl group.
  • Examples of the alkyl group having 1 to 12 carbon atoms in which the CH 2 group is substituted with phenylene include a phenyl group.
  • CH 2 group in the alkyl group, alkynyl group, alkenyl group or alkyloxy group having 1 to 12 carbon atoms is substituted with a plurality of the same or different O, S, OCO, COO, OCOO, CO or phenylene groups. May be.
  • Examples of the alkyl group having 1 to 12 carbon atoms in which the CH 2 group is substituted with a plurality of the same or different O, S, OCO, COO, OCOO, CO, or phenylene groups include an alkylphenylcarbonyl group and an alkylphenyloxycarbonyl group And alkylphenylcarbonyloxy group, alkoxyphenylcarbonyl group, alkoxyphenyloxycarbonyl group, alkoxyphenylcarbonyloxy group, alkoxyphenylcarbonyloxy group, alkylthiophenylcarbonyl group, alkylthiophenyloxycarbonyl group, alkylthiophenylcarbonyloxy group and the like.
  • the alkynyl group having 1 to 12 carbon atoms which may be substituted with CH 2 group by O, S, OCO, COO, OCOO, CO or phenylene group includes ethynyl group, 1-propynyl group, 2-propynyl group, 1 -Butynyl, 2-butynyl, 3-butynyl, 1-ethynyl-2-propynyl, 1-methyl-2-propynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, An undecynyl group, a dodecynyl group, a cyclooctynyl group and the like can be mentioned, and a group excluding hydrogen on a triple bond is preferable, and an ethynyl group, a 2-propynyl group, a 3-butynyl group, a
  • the alkenyl group having 1 to 12 carbon atoms that may be substituted with CH 2 group by O, S, OCO, COO, OCOO, CO, or a phenylene group may be linear or branched.
  • it is linear and is vinyl, prop-1- or prop-2-enyl, but-1-,-2- or but-3-enyl, pent-1-, -2-, -3 -Or pent-4-enyl, hex-1-, -2-, -3-, -4- or hex-5-enyl, hept-1-, -2-, -3-, -4-, -5 -Or hept-6-enyl, oct-1-, -2-, -3-, -4-, -5, -6- or oct-7-enyl, non-1-, -2-, -3 -, -4-, -5, -6-, -7- or non-8-enyl, dec-1-, -2-, -3
  • alkenyl groups are vinyl, 1E-propenyl, 1E-butenyl, 1E-pentenyl, 1E-hexenyl, 1E-heptenyl, 3-butenyl, 3E-pentenyl, 3E-hexenyl, 3E-heptenyl, 4-pentenyl, 4Z-hexenyl, 4E-hexenyl, 4Z-heptenyl, 5-hexenyl, 6-heptenyl and the like. Groups having up to 5 C atoms are generally preferred.
  • alkyloxy group having 1 to 12 carbon atoms examples include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, a hexoxy group, a heptoxy group, an octoxy group, a nonoxy group, a deoxy group, an undecoxy group, and a dodecoxy group Can do.
  • M is independently of each other a hydrogen atom, a fluorine atom, a bromine atom or an alkyl group, alkynyl group, alkenyl group or alkyloxy group having 1 to 12 carbon atoms (the CH 2 group therein is Preferably independently O, S, OCO, COO, OCOO, CO or a phenylene group), a hydrogen atom, a fluorine atom, a bromine atom or an alkyl group having 1 to 8 carbon atoms, an alkynyl group, More preferably, it represents an alkenyl group or an alkyloxy group (in which CH 2 groups may be each independently substituted with O, S, OCO, COO, OCOO, CO, or a phenylene group), a hydrogen atom, a fluorine atom , a bromine atom or an alkyl group having 1 to 4 carbon atoms, an alkynyl group, an alkenyl group or an alky
  • M the number of substituents other than hydrogen atoms is 0 to 4, preferably 0 to 2, and more preferably 0.
  • M represents a hydrogen atom.
  • R 1 is a linking group shown below.
  • R 3 independently represents an alkyl group having 1 to 3 carbon atoms or an aryl group having 6 to 10 carbon atoms
  • R 3 is preferably each independently an alkyl group having 1 to 3 carbon atoms or a phenyl group, and more preferably an alkyl group, an aryl group, or an alkenyl group.
  • the chiral agent represented by the general formula (1) is particularly preferably a chiral agent represented by the following general formula (3).
  • R a represents one of the following linking groups.
  • * represents the coupling
  • the present invention is not limited to the following specific examples.
  • the R body or only the S body of the chiral agent represented by the general formula (1) may be exemplified below, the corresponding S body and R body can also be used in the present invention.
  • the chiral agent represented by the general formula (1) is preferably left-turning, but the chiral agent represented by the general formula (1) is high in both R and S forms. In order to show HTP, you may use as a right-turning chiral agent.
  • the chiral agent represented by the general formula (1) can be synthesized by a method described in known literature or in the same manner. For example, Heteroatom Chemistry, 2011 vol. 22, p. It is preferable to synthesize by the method described in 562.
  • the R and S isomers of the chiral agent represented by the general formula (1) can be synthesized by synthesizing only the R isomer or the S isomer as the raw materials.
  • the racemate may be optically resolved by a known method.
  • R 2 represents any of the following substituents, and the two R 2 may be the same as or different from each other.
  • * represents the coupling
  • Y 1 each independently represents a single bond, —O—, —C ( ⁇ O) O—, —OC ( ⁇ O) —, —OC ( ⁇ O) O—, a single bond, —O— , —OC ( ⁇ O) — is preferable, and —O— is more preferable.
  • Sp 1 is preferably independently a single bond or an alkylene group having 1 to 8 carbon atoms, more preferably an alkylene group having 1 to 5 carbon atoms, and an alkylene group having 2 to 4 carbon atoms. Particularly preferred.
  • Z 1 each independently represents a hydrogen atom or a (meth) acryl group, and more preferably a hydrogen atom.
  • n represents an integer of 1 or more, preferably 1 to 3, more preferably 1 or 2, and particularly preferably 1.
  • the chiral agent represented by the general formula (2) is particularly preferably a chiral agent represented by the following general formula (4).
  • R b represents a substituent shown below, and two R b may be the same or different from each other, but are preferably the same.
  • * represents a bonding site with an oxygen atom in the general formula (4).
  • Y 2 represents a single bond, —O— or —OC ( ⁇ O) —, and more preferably —O—.
  • Sp 2 represents a single bond or an alkylene group having 1 to 8 carbon atoms, preferably an alkylene group having 1 to 8 carbon atoms, more preferably an alkylene group having 1 to 5 carbon atoms, 4 alkylene groups are particularly preferred.
  • Z 2 represents a hydrogen atom or a (meth) acryl group, and more preferably a hydrogen atom.
  • the cholesteric liquid crystal laminate of the present invention preferably contains an alignment control agent in the light reflection layer.
  • the alignment control agent that can be used in the present invention include a fluorine-based alignment control agent. Two or more kinds of alignment control agents may be contained.
  • the fluorine-based alignment control agent can reduce the tilt angle of the molecules of the liquid crystal compound or substantially horizontally align it at the air interface of the layer.
  • horizontal alignment means that the major axis of the liquid crystal molecule is parallel to the film surface, but it is not required to be strictly parallel. An orientation with an inclination angle of less than 20 degrees is meant.
  • the liquid crystal compound When the liquid crystal compound is horizontally aligned in the vicinity of the air interface, alignment defects are unlikely to occur, so that the transparency in the visible light region is increased and the reflectance in the infrared region is increased.
  • the molecules of the liquid crystal compound are aligned at a large tilt angle, the spiral axis of the cholesteric liquid crystal phase is shifted from the normal of the film surface, which decreases the reflectivity, generates a fingerprint pattern, increases haze, and increases diffraction. It is not preferable because it shows the property.
  • Examples of the alignment control agent include compounds exemplified in [0092] and [0093] of JP-A-2005-99248, and [0076] to [0078] and [0082] of JP-A-2002-129162. ] To [0085], the compounds exemplified in JP-A-2005-99248, [0094] and [0095], and JP-A-2005-99248, [0096]. The compound is included.
  • a compound represented by the following general formula (I) is also preferred as the fluorine-based alignment control agent.
  • L 11 , L 13 , L 13 , L 14 , L 15 and L 15 are each independently a single bond, —O—, —S—, —CO—, —COO—, —OCO. —, —COS—, —SCO—, —NRCO—, —CONR— (in the general formula (I), R represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms), —NRCO—, — CONR- has the effect of reducing the solubility, and has a tendency to increase the haze value during film formation.
  • the alkyl group which R can take may be linear or branched.
  • the number of carbon atoms is more preferably 1 to 3, and examples thereof include a methyl group, an ethyl group, and an n-propyl group.
  • Sp 11 , Sp 12 , Sp 13 and Sp 14 each independently represent a single bond or an alkylene group having 1 to 10 carbon atoms, more preferably a single bond or an alkylene group having 1 to 7 carbon atoms, and still more preferably A single bond or an alkylene group having 1 to 4 carbon atoms.
  • the hydrogen atom of the alkylene group may be substituted with a fluorine atom.
  • the alkylene group may or may not be branched, but a linear alkylene group having no branch is preferred. From the viewpoint of synthesis, it is preferable that Sp 11 and Sp 14 are the same, and Sp 12 and Sp 13 are the same.
  • a 11 and A 12 are trivalent or tetravalent aromatic hydrocarbons.
  • the carbon number of the trivalent or tetravalent aromatic hydrocarbon group is preferably 6 to 22, more preferably 6 to 14, further preferably 6 to 10, and further preferably 6. More preferred.
  • the trivalent or tetravalent aromatic hydrocarbon group represented by A 11 or A 12 may have a substituent. Examples of such a substituent include an alkyl group having 1 to 8 carbon atoms, an alkoxy group, a halogen atom, a cyano group, or an ester group. For the explanation and preferred ranges of these groups, the corresponding description of T below can be referred to.
  • Examples of the substituent for the trivalent or tetravalent aromatic hydrocarbon group represented by A 11 or A 12 include a methyl group, an ethyl group, a methoxy group, an ethoxy group, a bromine atom, a chlorine atom, and a cyano group. be able to.
  • a molecule having a large number of perfluoroalkyl moieties in the molecule can orient the liquid crystal with a small addition amount, leading to a decrease in haze, so that A 11 and A 12 have a large number of perfluoroalkyl groups in the molecule. It is preferable that it is tetravalent. From the viewpoint of synthesis, A 11 and A 12 are preferably the same.
  • T 11 (X contained in T 11 represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group, a halogen atom, a cyano group or an ester group.
  • Y, Yb, Yc and Yd each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and more preferably And more preferably And even more preferably It is.
  • the alkyl group that X contained in T 11 can have 1 to 8 carbon atoms, preferably 1 to 5 carbon atoms, and more preferably 1 to 3 carbon atoms.
  • the alkyl group may be linear, branched or cyclic, and is preferably linear or branched.
  • Examples of preferable alkyl groups include a methyl group, an ethyl group, an n-propyl group, and an isopropyl group, and among them, a methyl group is preferable.
  • the alkyl moiety of the alkoxy group X contained in the T 11 can be taken, it is possible to refer to the description and the preferred range of the alkyl group X contained in the T 11 can take.
  • Examples of the halogen atom that X contained in T 11 can take include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, and a chlorine atom and a bromine atom are preferable.
  • Examples of the ester group that can be taken by X contained in T 11 include a group represented by R′COO—.
  • R ′ include an alkyl group having 1 to 8 carbon atoms.
  • Specific examples of the ester include CH 3 COO— and C 2 H 5 COO—.
  • the alkyl group having 1 to 4 carbon atoms which Ya, Yb, Yc and Yd can take may be linear or branched.
  • the divalent aromatic heterocyclic group preferably has a 5-membered, 6-membered or 7-membered heterocyclic ring.
  • a 5-membered ring or a 6-membered ring is more preferable, and a 6-membered ring is most preferable.
  • the hetero atom constituting the heterocyclic ring a nitrogen atom, an oxygen atom and a sulfur atom are preferable.
  • the heterocycle is preferably an aromatic heterocycle.
  • the aromatic heterocycle is generally an unsaturated heterocycle. An unsaturated heterocyclic ring having the most double bond is more preferable.
  • heterocyclic rings examples include furan ring, thiophene ring, pyrrole ring, pyrroline ring, pyrrolidine ring, oxazole ring, isoxazole ring, thiazole ring, isothiazole ring, imidazole ring, imidazoline ring, imidazolidine ring, pyrazole ring, pyrazoline Ring, pyrazolidine ring, triazole ring, triazane ring, tetrazole ring, pyran ring, thiyne ring, pyridine ring, piperidine ring, oxazine ring, morpholine ring, thiazine ring, pyridazine ring, pyrimidine ring, pyrazine ring, piperazine ring and triazine ring included.
  • the divalent heterocyclic group may have a substituent.
  • substituents for the explanation and preferred range of examples of such substituents, reference can be made to the explanations and descriptions regarding the substituents that the trivalent or tetravalent aromatic hydrocarbons of A 1 and A 2 can take.
  • Hb 11 represents a perfluoroalkyl group having 2 to 30 carbon atoms, more preferably a perfluoroalkyl group having 3 to 20 carbon atoms, and still more preferably a perfluoroalkyl group having 3 to 10 carbon atoms.
  • the perfluoroalkyl group may be linear, branched or cyclic, but is preferably linear or branched, and more preferably linear.
  • m11 and n11 are each independently 0 to 3, and m11 + n11 ⁇ 1.
  • a plurality of structures in parentheses may be the same or different, but are preferably the same.
  • M11 and n11 in the general formula (I) are determined by the valences of A 11 and A 12 described above, and a preferable range is also determined by a preferable range of the valences of A 11 and A 12 .
  • O and p included in T 11 are each independently an integer of 0 or more, and when o and p are 2 or more, a plurality of X may be the same or different from each other.
  • O contained in T 11 is preferably 1 or 2.
  • P contained in T 11 is preferably an integer of 1 to 4, and more preferably 1 or 2.
  • the compound represented by the general formula (I) may have a symmetrical molecular structure or may have no symmetry.
  • the symmetry here means one corresponding to any of point symmetry, line symmetry, or rotational symmetry
  • asymmetry means one not corresponding to any of point symmetry, line symmetry, or rotational symmetry.
  • the compound represented by the general formula (I) includes the perfluoroalkyl group (Hb 11 ), the linking group-(-Sp 11 -L 11 -Sp 12 -L 12 ) m11 -A 11 -L 13 -and -L 14 -A 12 - (L 15 -Sp 13 -L 16 -Sp 14 -) n11 -, and is preferably a compound which is a combination of T is a divalent group having the excluded volume effect.
  • the two perfluoroalkyl groups (Hb 11 ) present in the molecule are preferably the same as each other, and the linking group present in the molecule — (— Sp 11 -L 11 -Sp 12 -L 12 ) m11 -A 11 -L 13 - and -L 14 -A 12 - (L 15 -Sp 13 -L 16 -Sp 14 -) n11 - is preferably also the same.
  • the terminal Hb 11 -Sp 11 -L 11 -Sp 12 -and -Sp 13 -L 16 -Sp 14 -Hb 11 are preferably groups represented by any one of the following general formulas.
  • a is preferably from 2 to 30, more preferably from 3 to 20, and even more preferably from 3 to 10.
  • b is preferably 0 to 20, more preferably 0 to 10, and still more preferably 0 to 5.
  • a + b is 3 to 30.
  • r is preferably from 1 to 10, and more preferably from 1 to 4.
  • Hb 11 -Sp 11 -L 11 -Sp 12 -L 12 -and -L 14 -Sp 13 -L 16 -Sp 14 -Hb 11 at the terminal of the general formula (I) are any of the following general formulas: It is preferable that it is group represented by these.
  • the amount of the fluorine-based horizontal alignment agent is preferably 0.01 to 10% by mass with respect to the polymerizable liquid crystal compound. It is more preferably from 01 to 5% by mass, particularly preferably from 0.01 to 1% by mass, particularly preferably from 0.01 to 0.09% by mass, and from 0.01 to 0.06%. It is even more particularly preferable that it is mass%.
  • each light reflecting layer used in the cholesteric liquid crystal laminate of the present invention may contain a perfluoroalkyl group from the viewpoint of suppressing the amount of the fluorine-based horizontal alignment agent added to the above range. More preferably, it contains a perfluoroalkyl group having 3 to 10 carbon atoms.
  • Each light reflecting layer used in the cholesteric liquid crystal laminate of the present invention preferably contains a polymerization initiator.
  • the polymerization initiator to be used is preferably a photopolymerization initiator that can initiate the polymerization reaction by ultraviolet irradiation.
  • photopolymerization initiators include ⁇ -carbonyl compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ether (described in US Pat. No. 2,448,828), ⁇ -hydrocarbon substituted aromatics.
  • Group acyloin compounds described in US Pat.
  • the amount of the photopolymerization initiator used is preferably 0.1 to 20% by mass, more preferably 1 to 8% by mass, based on the composition (solid content in the case of a coating solution).
  • Each light reflecting layer used in the cholesteric liquid crystal laminate of the present invention is necessary in addition to the compounds represented by the general formulas (Ia) and (Ib), the fluorine-based horizontal alignment controller and the polymerization initiator.
  • the solvent it may contain a solvent and other additives (for example, cellulose ester).
  • the cholesteric liquid crystal laminate of the present invention preferably has a substrate.
  • a well-known base material can be used, and it is preferable that it is a transparent base material.
  • the transparent substrate is not particularly limited as long as it is an optically transparent transparent substrate, and can be appropriately selected according to the purpose.
  • Examples of the shape include a flat plate shape, and the structure may be a single layer structure or a laminated structure, and the size may be the size of the infrared cut film. It can be appropriately selected according to the above.
  • the material for the substrate is not particularly limited and may be appropriately selected depending on the intended purpose. Examples of the material for the transparent substrate include polyethylene, polypropylene, poly-4-methylpentene-1, and polybutene-1.
  • Polyolefin resins such as polyethylene terephthalate and polyethylene naphthalate; Polycarbonate resins, polyvinyl chloride resins, polyphenylene sulfide resins, polyether sulfone resins, polyethylene sulfide resins, polyphenylene ether resins, styrene resins
  • polyester resins such as polyethylene terephthalate and polyethylene naphthalate
  • Polycarbonate resins polyvinyl chloride resins, polyphenylene sulfide resins, polyether sulfone resins, polyethylene sulfide resins, polyphenylene ether resins, styrene resins
  • a film made of a resin an acrylic resin, a polyamide resin, a polyimide resin, a cellulose resin such as cellulose acetate, or a laminated film thereof.
  • a polyethylene terephthalate film is particularly preferable.
  • the thickness of the substrate is not particularly limited and can
  • the thickness is about 10 ⁇ m to 500 ⁇ m, but it is thinner from the viewpoint of thinning demand. Is preferred.
  • the thickness of the substrate is preferably 10 ⁇ m to 100 ⁇ m, more preferably 20 to 75 ⁇ m, and particularly preferably 35 to 75 ⁇ m. If the thickness of the substrate is sufficiently thick, adhesion failure tends to be difficult to occur.
  • the thickness of the base material is sufficiently thin, when it is bonded to a building material or an automobile, the waist as a material is not too strong and the construction tends to be easy. Furthermore, since the base material is sufficiently thin, raw material costs tend to be suppressed.
  • the cholesteric liquid crystal laminate of the present invention preferably further has at least one of an easy-adhesion layer, a hard coat layer, an ultraviolet absorption layer, an adhesive layer, and a surface protective layer.
  • the cholesteric liquid crystal laminate of the present invention may have an easy adhesion layer as one or both outermost layers.
  • the easy-adhesion layer has a function of improving adhesiveness with an interlayer film for laminated glass, for example. More specifically, the easy-adhesion layer has a function of improving the adhesion between the cholesteric liquid crystal phase light reflection layer and / or substrate and the interlayer film for laminated glass.
  • Examples of a material that can be used for forming the easy-adhesion layer include polyvinyl butyral (PVB) resin.
  • the polyvinyl butyral resin is a kind of polyvinyl acetal produced by reacting polyvinyl alcohol (PVA) and butyraldehyde with an acid catalyst, and is a resin having a repeating unit having the following structure.
  • the easy adhesion layer is formed by coating.
  • coating to the surface of the light reflection layer of a cholesteric liquid crystal phase, and / or the back surface (surface in which the light reflection layer is not formed) of a board
  • one type of polyvinyl butyral resin is dissolved in an organic solvent to prepare a coating solution, and the coating solution is applied to the surface of the light reflecting layer of the cholesteric liquid crystal phase and / or the back surface of the substrate, If desired, it can be heated and dried to form an easy-adhesion layer.
  • a solvent used for preparing the coating solution for example, methoxypropyl acetate (PGMEA), methyl ethyl ketone (MEK), isopropanol (IPA) and the like can be used.
  • PGMEA methoxypropyl acetate
  • MEK methyl ethyl ketone
  • IPA isopropanol
  • the preferred temperature for drying varies depending on the material used for the preparation of the coating solution, but generally it is preferably about 140 to 160 ° C.
  • the drying time is not particularly limited, but is generally about 5 to 10 minutes.
  • the easy-adhesion layer may be a layer made of an acrylic resin, a styrene / acrylic resin, a urethane resin, a polyester resin, or the like, so-called an undercoat layer.
  • An easy adhesion layer made of these materials can also be formed by coating.
  • Some commercially available polymer films are provided with an undercoat layer. Therefore, these commercially available products can be used as a substrate.
  • the thickness of the easy adhesion layer is preferably 0.1 to 2.0 ⁇ m.
  • the cholesteric liquid crystal laminate of the present invention may have an undercoat layer between the light reflecting layer of the cholesteric liquid crystal phase and the substrate. If the adhesion between the cholesteric liquid crystal phase light reflecting layer and the substrate is weak, peeling failure is likely to occur in the process of stacking and manufacturing the cholesteric liquid crystal phase light reflecting layer, and the strength when laminated glass ( Impact resistance). Therefore, a layer that can improve the adhesion between the cholesteric liquid crystal layer and the substrate can be used as the undercoat layer.
  • the substrate or the substrate and the undercoat layer are peeled off and the member such as the intermediate film and the light reflecting layer are integrated, the substrate and the undercoat layer, or the undercoat layer and the light reflecting layer of the cholesteric liquid crystal phase
  • the interface needs to be weak enough to be peelable.
  • materials that can be used to form the undercoat layer include acrylate copolymer, polyvinylidene chloride, styrene butadiene rubber (SBR), aqueous polyester, and the like.
  • the undercoat layer also contains a polyvinyl butyral resin together with the material. It is preferable.
  • a dialdehyde such as glutaraldehyde, 2,3-dihydroxy-1,4-dioxane, or a hardener such as boric acid is used. It is preferable to use the film appropriately.
  • the addition amount of the hardener is preferably 0.2 to 3.0% by mass of the dry mass of the undercoat layer.
  • the thickness of the undercoat layer is preferably 0.05 to 0.5 ⁇ m.
  • the cholesteric liquid crystal laminate of the present invention may have an alignment layer between the light reflecting layer of the cholesteric liquid crystal phase and the substrate.
  • the alignment layer has a function of more precisely defining the alignment direction of the liquid crystal compound in the cholesteric liquid crystal layer.
  • the alignment layer can be provided by means such as a rubbing treatment of an organic compound (preferably a polymer), oblique vapor deposition of an inorganic compound, or formation of a layer having a microgroove.
  • an alignment layer in which an alignment function is generated by application of an electric field, application of a magnetic field, or light irradiation is also known.
  • the alignment layer is preferably formed on the surface of the polymer film by rubbing treatment.
  • the alignment layer is preferably adjacent to the light reflective layer of the cholesteric liquid crystal phase, it is preferably provided between the light reflective layer of the cholesteric liquid crystal phase and the substrate or undercoat layer.
  • the undercoat layer may have a function of an alignment layer.
  • you may have an orientation layer between the light reflection layers.
  • the alignment layer preferably has a certain degree of adhesion to the adjacent light reflecting layer of the cholesteric liquid crystal phase, and the undercoat layer or the substrate.
  • the interface to be peeled may be any interface, but it is preferable to peel at the interface between the alignment layer and the undercoat layer in consideration of making a laminated interlayer sheet in a subsequent step.
  • a polymer of an organic compound is preferable, and a polymer that can be crosslinked by itself or a polymer that is crosslinked by a crosslinking agent is often used. Of course, polymers having both functions are also used.
  • polymers examples include polymethyl methacrylate, acrylic acid / methacrylic acid copolymer, styrene / maleimide copolymer, polyvinyl alcohol and modified polyvinyl alcohol, poly (N-methylol acrylamide) Styrene / vinyl toluene copolymer, chlorosulfonated polyethylene, nitrocellulose, polyvinyl chloride, chlorinated polyolefin, polyester, polyimide, vinyl acetate / vinyl chloride copolymer, ethylene / vinyl acetate copolymer, carboxymethyl cellulose And polymers such as silica, gelatin, polyethylene, polypropylene and polycarbonate, and compounds such as silane coupling agents.
  • Examples of preferred polymers are water-soluble polymers such as poly (N-methylacrylamide), carboxymethyl cellulose, gelatin, polyvir alcohol and modified polyvinyl alcohol, and further gelatin, polyvir alcohol and modified polyvinyl alcohol.
  • water-soluble polymers such as poly (N-methylacrylamide), carboxymethyl cellulose, gelatin, polyvir alcohol and modified polyvinyl alcohol, and further gelatin, polyvir alcohol and modified polyvinyl alcohol.
  • polyvinyl alcohol and modified polyvinyl alcohol can be mentioned.
  • the alignment layer also contains the polyvinyl butyral resin together with the material. It is preferable.
  • the thickness of the alignment layer is preferably 0.1 to 2.0 ⁇ m.
  • the hard coat layer can contain metal oxide particles.
  • the kind and formation method can be selected suitably according to the objective, For example, acrylic resin, silicone resin, melamine resin, urethane resin, alkyd resin And thermosetting or photocurable resins such as fluorine-based resins.
  • the thickness of the hard coat layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1 ⁇ m to 50 ⁇ m.
  • the hard coat layer may contain the metal oxide particles.
  • the cholesteric liquid crystal laminate of the present invention preferably has a layer containing an ultraviolet absorber.
  • the layer containing the ultraviolet absorber can be appropriately selected according to the purpose. However, depending on the type of the ultraviolet absorber, the liquid crystal orientation may be affected, so members other than the light reflecting layer (layer, substrate, etc.) ) Is preferably added.
  • the embodiment of the present invention may take various forms, but it is preferably added to a member into which light enters earlier than the light reflecting layer. For example, it is preferable to add to a layer disposed between the glass plate disposed on the outdoor side and the light reflecting layer of the cholesteric liquid crystal phase.
  • ultraviolet absorbers examples include ultraviolet absorbers such as benzotriazole-based, benzodithiol-based, coumarin-based, benzophenone-based, salicylic acid ester-based, and cyanoacrylate-based materials; titanium oxide, zinc oxide, and the like.
  • ultraviolet absorbers examples include Tinuvin 326, 328, 479 (all manufactured by Ciba Japan).
  • the kind and compounding quantity of a ultraviolet absorber do not have a restriction
  • the member containing the ultraviolet absorber has an effect of reducing the transmittance of ultraviolet rays having a wavelength of 380 nm or less to 0.1% or less, the deterioration of the light reflecting layer can be remarkably reduced, and yellowing due to ultraviolet rays is remarkably reduced. Since it can reduce, it is preferable. Therefore, it is preferable to determine the type and blending amount of the ultraviolet absorber so as to satisfy this characteristic.
  • the cholesteric liquid crystal laminate of the present invention preferably has an adhesive layer (hereinafter also referred to as an adhesive layer).
  • the adhesive layer may include an ultraviolet absorber.
  • the material that can be used for forming the adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose.
  • An adhesive layer made of these materials can be formed by coating.
  • an antistatic agent, a lubricant, an antiblocking agent and the like may be added to the adhesive layer.
  • the thickness of the adhesive layer is preferably 0.1 ⁇ m to 10 ⁇ m.
  • the method for producing the cholesteric liquid crystal laminate of the present invention is not particularly limited and can be appropriately selected depending on the purpose.
  • a near-infrared reflective layer or a near-infrared ray is formed on the surface of the lower layer such as the support.
  • Examples include a method of applying a coating solution for the absorption layer by a dip coater, a die coater, a slit coater, a bar coater, a gravure coater, or the like, a method of aligning the surface by a method such as an LB film method, a self-organization method, or a spray coating method. .
  • the method of applying with a bar coater is preferable.
  • the cholesteric liquid crystal laminate of the present invention is preferably produced by the following method for producing a cholesteric liquid crystal laminate of the present invention.
  • the method for producing a cholesteric liquid crystal laminate of the present invention is performed by coating using a polymerizable liquid crystal composition for the light reflecting layer Xa containing a rod-like liquid crystal compound and a right-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more.
  • a coating film is formed, heat is applied to the polymerizable liquid crystal composition for the light reflecting layer Xa to form a cholesteric liquid crystal phase, and the polymerizable liquid crystal composition for the light reflecting layer Xa is irradiated with actinic radiation to cholesteric.
  • a coating film is formed by coating using a rod-like liquid crystal compound, a polymerizable liquid crystal composition for light reflection layer Xb containing a left-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more, and the light reflection layer Xb Heat is applied to the polymerizable liquid crystal composition to form a cholesteric liquid crystal phase, and the polymerizable liquid crystal composition for the light reflecting layer Xb is irradiated with actinic radiation to fix the cholesteric liquid crystal phase to at least one light reflecting layer.
  • the selective reflection wavelengths of all the light reflection layers Xa and all the light reflection layers Xb are in the range of 400 nm to 750 nm, and the selective reflection wavelength of at least one layer of the light reflection layer Xa and at least one layer of the light reflection layer
  • the selective reflection wavelengths of Xb are equal to each other, and the polymerizable liquid crystal composition for the upper light reflection layer is made of the lower light reflection layer so that the light reflection layers formed by fixing all adjacent cholesteric liquid crystal phases are in contact with each other. It is characterized by being applied directly on top. With such a configuration, the cholesteric liquid crystal laminate of the present invention can be manufactured easily and with high productivity.
  • the method for producing a cholesteric liquid crystal laminate of the present invention is performed by coating using a polymerizable liquid crystal composition for the light reflecting layer Xa containing a rod-like liquid crystal compound and a right-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more.
  • a coating film is formed.
  • the lower layer is not particularly limited, but preferably includes a step of applying the polymerizable liquid crystal composition for the light reflecting layer Xa onto the substrate.
  • the polymerizable liquid crystal composition for the light reflecting layer Xa is not limited to an embodiment in which the polymerizable liquid crystal composition is directly applied to the substrate, and may be applied on another light reflecting layer or an alignment layer.
  • the manufacturing method of the cholesteric-liquid-crystal laminated body of this invention apply
  • each light reflecting layer of the cholesteric liquid crystal laminate of the present invention When forming each light reflecting layer of the cholesteric liquid crystal laminate of the present invention by coating, other additives such as a solvent and a surfactant may be added to the polymerizable liquid crystal composition used as the coating liquid.
  • a solvent and a surfactant may be added to the polymerizable liquid crystal composition used as the coating liquid.
  • organic solvent As a solvent for the composition for forming each light reflecting layer used in the cholesteric liquid crystal laminate of the present invention, an organic solvent is preferably used.
  • organic solvents include amides (eg, N, N-dimethylformamide), sulfoxides (eg, dimethyl sulfoxide), heterocyclic compounds (eg, pyridine), hydrocarbons (eg, benzene, hexane), alkyl halides (eg, , Chloroform, dichloromethane), esters (eg, methyl acetate, butyl acetate), ketones (eg, acetone, methyl ethyl ketone, cyclohexanone), ethers (eg, tetrahydrofuran, 1,2-dimethoxyethane). Alkyl halides and ketones are preferred. Two or more organic solvents may be used in combination.
  • each light reflecting layer of the cholesteric liquid crystal laminate of the present invention by coating, it is preferable to form each light reflecting layer by applying the coating liquid and then drying and solidifying by a known method. As a drying method, drying by heating is preferable.
  • An example of a manufacturing method of each light reflecting layer is (1) Applying a polymerizable liquid crystal composition to the surface of a substrate or the like to bring it into a cholesteric liquid crystal phase; (2) irradiating the polymerizable liquid crystal composition with ultraviolet rays to advance a curing reaction, fixing a cholesteric liquid crystal phase, and forming each light reflection layer; Is a production method comprising at least By repeating the steps (1) and (2) twice on one surface of the substrate, a cholesteric liquid crystal laminate having the same structure as that shown in FIG. 1 can be produced.
  • the direction of rotation of the cholesteric liquid crystal phase can be adjusted by the type of liquid crystal used or the type of chiral agent added, and the helical pitch (that is, the selective reflection wavelength) can be arbitrarily adjusted by the concentration of these materials.
  • the wavelength of a specific region reflected by each light reflecting layer can be shifted by various factors of the manufacturing method.
  • concentration of a chiral agent, etc. when fixing a cholesteric liquid crystal phase Can be shifted depending on conditions such as temperature, illuminance and irradiation time.
  • the polymerizable liquid crystal composition is applied to the surface of the substrate or the lower light reflection layer.
  • the polymerizable liquid crystal composition is preferably prepared as a coating solution in which a material is dissolved and / or dispersed in a solvent.
  • the coating liquid can be applied by various methods such as a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die coating method.
  • a liquid crystal composition can be discharged from a nozzle using an ink jet apparatus to form a coating film.
  • the polymerizable liquid crystal composition applied to the surface to become a coating film is brought into a cholesteric liquid crystal phase.
  • the coating film may be dried and the solvent may be removed to obtain a cholesteric liquid crystal phase.
  • you may heat the said coating film if desired.
  • the cholesteric liquid crystal phase can be stably formed by heating to the temperature of the isotropic phase and then cooling to the cholesteric liquid crystal phase transition temperature.
  • the liquid crystal phase transition temperature of the polymerizable liquid crystal composition is preferably in the range of 10 to 250 ° C., more preferably in the range of 10 to 150 ° C. from the viewpoint of production suitability and the like.
  • a cooling step or the like may be required to lower the temperature to a temperature range exhibiting a liquid crystal phase.
  • a high temperature is required to make the isotropic liquid state higher than the temperature range once exhibiting the liquid crystal phase, which is disadvantageous from waste of thermal energy, deformation of the substrate, and alteration.
  • the coating film in the cholesteric liquid crystal phase is irradiated with ultraviolet rays to advance the curing reaction.
  • a light source such as an ultraviolet lamp is used.
  • the curing reaction of the polymerizable liquid crystal composition proceeds, the cholesteric liquid crystal phase is fixed, and a light reflecting layer is formed.
  • the amount of irradiation energy of ultraviolet rays is not particularly limited, but is generally preferably about 100 mJ / cm 2 to 800 mJ / cm 2 .
  • limiting in particular about the time which irradiates the said coating film with an ultraviolet-ray it will be determined from the viewpoint of both sufficient intensity
  • ultraviolet irradiation may be performed under heating conditions. Moreover, it is preferable to maintain the temperature at the time of ultraviolet irradiation in the temperature range which exhibits a cholesteric liquid crystal phase so that a cholesteric liquid crystal phase may not be disturbed. Also, since the oxygen concentration in the atmosphere is related to the degree of polymerization, if the desired degree of polymerization is not reached in the air and the film strength is insufficient, the oxygen concentration in the atmosphere is reduced by a method such as nitrogen substitution. It is preferable. A preferable oxygen concentration is preferably 10% or less, more preferably 7% or less, and most preferably 3% or less.
  • the reaction rate of the curing reaction (for example, polymerization reaction) that proceeds by irradiation with ultraviolet rays is 70% or more from the viewpoint of maintaining the mechanical strength of the layer and suppressing unreacted substances from flowing out of the layer. Preferably, it is 80% or more, more preferably 90% or more.
  • a method of increasing the irradiation amount of ultraviolet rays to be irradiated and polymerization under a nitrogen atmosphere or heating conditions are effective.
  • a method of further promoting the reaction by a thermal polymerization reaction by maintaining the polymer at a temperature higher than the polymerization temperature, or a method of irradiating ultraviolet rays again (however, irradiation is performed under conditions satisfying the conditions of the present invention).
  • the reaction rate can be measured by comparing the absorption intensity of the infrared vibration spectrum of a reactive group (for example, a polymerizable group) before and after the reaction proceeds.
  • the cholesteric liquid crystal phase is fixed and each light reflecting layer is formed.
  • the state in which the liquid crystal phase is “fixed” is the most typical and preferred mode in which the orientation of the rod-like liquid crystal compound that is a cholesteric liquid crystal phase is maintained.
  • the layer has no fluidity and is oriented by an external field or external force. It shall mean a state in which the fixed orientation form can be kept stable without causing a change in form.
  • the alignment state of the cholesteric liquid crystal phase is preferably fixed by a curing reaction that proceeds by ultraviolet irradiation.
  • the liquid crystal composition may have a high molecular weight due to a curing reaction and may no longer have liquid crystallinity.
  • the combination of the cholesteric liquid crystal laminates of the present invention has a plurality of cholesteric liquid crystal laminates of the present invention, the selective reflection wavelengths of the cholesteric liquid crystal laminates are different from each other, and an adhesive layer between the cholesteric liquid crystal laminates And at least one of adhesive layers. With such a configuration, visible light can be reflected at a wide wavelength range.
  • the selective reflection wavelength of the cholesteric liquid crystal laminate refers to the light reflection layer Xa and the light reflection included in a set of the light reflection layer Xa and the light reflection layer Xb in the cholesteric liquid crystal laminate.
  • the selective reflection wavelength when the selective reflection wavelengths of the layers Xb are equal to each other.
  • the cholesteric liquid crystal laminate has two or more sets of the light reflection layer Xa and the light reflection layer Xb, and the light reflection layer Xa and the light reflection included in each set, respectively.
  • the selective reflection wavelengths of the layers Xb are equal to each other, the selective reflection wavelengths of the light reflection layers Xa included in different sets are different from each other, and the selective reflection wavelengths of the light reflection layers Xb included in different sets are different from each other, Is a selective reflection wavelength when the selective reflection wavelengths of the light reflection layer Xa and the light reflection layer Xb are equal to each other (in this case, there are a plurality of selective reflection wavelengths of the cholesteric liquid crystal laminate). Become).
  • the selective reflection wavelengths of the cholesteric liquid crystal laminates are different from each other means that the selective reflection wavelength difference between the cholesteric liquid crystal laminates exceeds 20 nm.
  • the difference between all the selective reflection wavelengths of one cholesteric liquid crystal laminate and any of the selective reflection wavelengths of the other cholesteric liquid crystal laminate exceeds 20 nm.
  • ⁇ Characteristics of a combination of cholesteric liquid crystal laminates> There is no restriction
  • the maximum transmittance in the range of 420 to 680 nm is preferably 10% or less from the viewpoint of efficiently reflecting light with high human visibility.
  • the number of the cholesteric liquid crystal laminates of the present invention, which are contained in the combination of the cholesteric liquid crystal laminates of the present invention and have different selective reflection wavelengths is preferably 2 to 10, More preferably, it is 6-10.
  • the maximum transmittance in the range of 450 to 500 nm and in the range of 600 to 660 nm is 10% or less, and the transmittance at 550 nm is 20% or more.
  • the number of the cholesteric liquid crystal laminates of the present invention, which are contained in the combination of the cholesteric liquid crystal laminates of the present invention and have different selective reflection wavelengths is preferably 2 to 10, More preferably, it is 2-6.
  • the difference in the selective reflection wavelength (peak wavelength) between the cholesteric liquid crystal laminates of the present invention is not particularly limited, and can be appropriately changed according to the band of the selective reflection wavelength, but is preferably 20 nm or more, for example, 30 nm or more. It is more preferable that the thickness be 40 nm or more.
  • the cholesteric liquid crystal laminate combination of the present invention has at least one of an adhesive layer and an adhesive layer between the cholesteric liquid crystal laminates.
  • An adhesive sheet may be used as the adhesive layer.
  • As the adhesive layer a two-component mixed type, one-component heat curable type or photo-curable type adhesive may be used, and a colorless and transparent adhesive is preferably used. Note that one adhesive layer or one adhesive layer may be used, or two or more may be used. Further, a pressure-sensitive adhesive layer and an adhesive layer may be used in combination.
  • FIG. 3 shows an example of the configuration of the combination of cholesteric liquid crystal laminates of the present invention. In FIG.
  • FIG. 5 is a schematic view of a cholesteric liquid crystal laminate combination 22 in which a second light reflection layer Xb (14b) and a second light reflection layer Xa (14a) are laminated via an adhesive layer 11.
  • the selective reflection wavelengths of the first reflection layer Xa and the first light reflection layer Xb are equal, and the selective reflection wavelengths of the second reflection layer Xa and the second light reflection layer Xb are equal.
  • the selective reflection wavelengths of the first reflection layer Xa and the first light reflection layer Xb are different from each other, and the selective reflection wavelengths of the second reflection layer Xa and the second light reflection layer Xb are different from each other.
  • the cholesteric liquid crystal laminate of the present invention contained in the combination of cholesteric liquid crystal laminates of the present invention may or may not contain the substrate, but the combination of cholesteric liquid crystal laminates of the present invention includes It is preferable from the viewpoint of thinning that the number of layers contained is small, and it is more preferable that the number of layers is one.
  • the method for producing the combination of the cholesteric liquid crystal laminates of the present invention is not particularly limited, but the first reflective layer Xa formed by fixing the cholesteric liquid crystal layer on the substrate and the first cholesteric liquid crystal layer fixed.
  • a first cholesteric liquid crystal laminate in which one light reflecting layer Xb is laminated in this order, and a second reflecting layer Xa formed by fixing a cholesteric liquid crystal layer on a base material and a cholesteric liquid crystal layer are fixed.
  • the second light reflecting layer Xb in the second cholesteric liquid crystal laminate can be bonded onto the adhesive material for production.
  • the first cholesteric liquid crystal laminate and the second cholesteric liquid crystal laminate are bonded by the above procedure. After that, the base material in the second cholesteric liquid crystal laminate can be peeled off for production.
  • Example 1 ⁇ Preparation of cholesteric liquid crystalline mixture (R1)> The following compound 1, compound in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and solvent methyl ethyl ketone were mixed to prepare a coating solution having the following composition. The obtained coating liquid was made into the coating liquid (R1) which is a cholesteric liquid crystalline mixture.
  • ⁇ Preparation of cholesteric liquid crystalline mixture (L1-1)> The compound 1, the compound in the compound group B, a fluorine-based horizontal alignment agent, a chiral agent, a polymerization initiator, and a solvent methyl ethyl ketone were mixed to prepare a coating solution having the following composition.
  • the obtained coating liquid was designated as a coating liquid (L1-1) which is a cholesteric liquid crystalline mixture.
  • undercoat layer coating solution (S1) having the composition shown below was prepared.
  • An alignment layer coating solution (H1) having the composition shown below was prepared.
  • the undercoat layer coating solution (S1) is dried using a wire bar.
  • the wire bar was applied to a thickness of 0.25 ⁇ m.
  • an alignment layer coating solution (H1) was applied on the formed undercoat layer using a wire bar so that the film thickness after drying was 1.0 ⁇ m.
  • the alignment layer was subjected to rubbing treatment (rayon cloth, pressure: 0.1 kgf, rotation speed: 1000 rpm, conveyance speed: 10 m / min, frequency: 1 reciprocation).
  • a liquid crystal film is formed by fixing the cholesteric liquid crystal phase by the following procedure and fixing the cholesteric liquid crystal phase that is a visible light reflecting layer.
  • Manufactured (1) Apply the coating solution (R1) at room temperature on an undercoat layer and an alignment layer formed on the PET film using a wire bar so that the thickness of the dried film is 5 ⁇ m. did. (2) After drying at room temperature for 30 seconds to remove the solvent, the mixture was heated in an atmosphere of 90 ° C. for 2 minutes, and then converted into a cholesteric liquid crystal phase at 35 ° C.
  • a cholesteric liquid crystal film (F1) was prepared. When the film (F1) was placed on black paper, a blue selective reflection color was confirmed. Further, a cholesteric liquid crystal film (F1b-1) was prepared in the same manner as the method for producing the cholesteric liquid crystal film (F1) except that the coating liquid (L1-1) was used instead of the coating liquid (R1).
  • cholesteric liquid crystal laminate ⁇ Production of cholesteric liquid crystal laminate> (1) The coating solution (L1-1) was coated on the film (F1) at room temperature using a wire bar so that the thickness of the dried film was 5 ⁇ m. (2) After drying at room temperature for 30 seconds to remove the solvent, the mixture was heated in an atmosphere of 90 ° C. for 2 minutes, and then converted into a cholesteric liquid crystal phase at 35 ° C. Next, UV irradiation was performed at an output of 60% for 6 to 12 seconds using an electrodeless lamp “D bulb” (90 mW / cm) manufactured by Fusion UV Systems Co., Ltd., and the cholesteric liquid crystal phase was fixed on the PET film. A cholesteric liquid crystal laminate (G1-1) was prepared by fixing two layers.
  • the produced cholesteric liquid crystal laminate (G1-1) was free of significant defects and streaks and had a good surface shape. Further, when the cholesteric liquid crystal laminate (G1-1) was placed on black paper, a strong blue selective reflection color was confirmed. This cholesteric liquid crystal laminate (G1-1) was used as the cholesteric liquid crystal laminate of Example 1.
  • the reflection width means a wavelength range in which the transmittance is 50% or less by selective reflection, and a wider range of light can be reflected as the reflection width is larger.
  • the coating liquid (R1) a result of calculating according to the following equation HTP of a chiral agent used in the coating solution (L1-1), respectively, 55 .mu.m -1, 37 [mu] m -1, and the both HTP is 30 [mu] m -1 or more there were.
  • HTP 1 ⁇ ⁇ (helical pitch length ( ⁇ m)) ⁇ (mass% concentration of chiral agent in solid content) ⁇ (However, the helical pitch length ( ⁇ m) was calculated by (selective reflection wavelength ( ⁇ m)) ⁇ (average refractive index of solid content), and the average refractive index of solid content was calculated assuming 1.5.)
  • Example 2 ⁇ Preparation of cholesteric liquid crystalline mixture (L1-2)> The following compound 1, compound in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and solvent methyl ethyl ketone were mixed to prepare a coating solution having the following composition.
  • the obtained coating liquid was designated as a coating liquid (L1-2) which is a cholesteric liquid crystalline mixture.
  • cholesteric liquid crystal laminate A cholesteric liquid crystal phase was fixed on the film (F1) produced in Example 1 in the same manner as in Example 1 except that the coating liquid (L1-2) was used instead of the coating liquid (L1-1).
  • the produced cholesteric liquid crystal laminate (G1-2) was free of significant defects and streaks and had a good surface shape.
  • This cholesteric liquid crystal laminate (G1-2) was used as the cholesteric liquid crystal laminate of Example 2.
  • a cholesteric liquid crystal film (F1b-2) was produced in the same manner as the cholesteric liquid crystal film (F1b-1) using the coating liquid (L1-2) instead of the coating liquid (L1-1).
  • the cholesteric liquid crystal laminate of Example 2 was evaluated. The results are shown in Table 3 below.
  • the produced cholesteric liquid crystal film (F1b-2) was evaluated in the same manner as in Example 1.
  • Example 3 ⁇ Preparation of cholesteric liquid crystalline mixture (L1-3)> The following compound 1, compound in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and solvent methyl ethyl ketone were mixed to prepare a coating solution having the following composition. The obtained coating solution was used as a coating solution (L1-3) which is a cholesteric liquid crystalline mixture.
  • cholesteric liquid crystal laminate A cholesteric liquid crystal phase was fixed on the film (F1) produced in Example 1 in the same manner as in Example 1 except that the coating liquid (L1-3) was used instead of the coating liquid (L1-1).
  • a cholesteric liquid crystal laminate (G1-3) comprising two cholesteric liquid crystal phases fixed on a PET film was produced.
  • the produced cholesteric liquid crystal laminate (G1-3) had no noticeable defects or streaks and had a good surface shape.
  • This cholesteric liquid crystal laminate (G1-3) was used as the cholesteric liquid crystal laminate of Example 3.
  • a cholesteric liquid crystal film (F1b-3) was produced in the same manner as the cholesteric liquid crystal film (F1b-1) using the coating liquid (L1-3) instead of the coating liquid (L1-1).
  • the cholesteric liquid crystal laminate of Example 3 was evaluated. The results are shown in Table 3 below.
  • the produced cholesteric liquid crystal film (F1b-3) was evaluated in the same manner as in Example 1.
  • a cholesteric liquid crystal phase was fixed on the film (F1) produced in Example 1 in the same manner as in Example 1 except that the coating liquid (L1-4) was used instead of the coating liquid (L1-1).
  • a cholesteric liquid crystal laminate (G1-4) was prepared by fixing two cholesteric liquid crystal phases on a PET film. Defect lines were observed in the produced cholesteric liquid crystal laminate (G1-4). This cholesteric liquid crystal laminate (G1-4) was used as the cholesteric liquid crystal laminate of Comparative Example 1.
  • a cholesteric liquid crystal film (F1b-4) was produced in the same manner as the cholesteric liquid crystal film (F1b-1) using the coating liquid (L1-4) instead of the coating liquid (L1-1).
  • the cholesteric liquid crystal laminate of Comparative Example 1 was evaluated in the same manner as in Example 1. The results are shown in Table 3 below.
  • the produced cholesteric liquid crystal film (F1b-4) was evaluated in the same manner as in Example 1.
  • Example 4 ⁇ Preparation of cholesteric liquid crystalline mixture (R2)> The following compound 1, compound B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and solvent methyl ethyl ketone were mixed to prepare a coating solution having the following composition. The obtained coating liquid was made into the coating liquid (R2) which is a cholesteric liquid crystalline mixture.
  • cholesteric liquid crystalline mixture (L2) ⁇ Preparation of cholesteric liquid crystalline mixture (L2)> The following compound 1, compound in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and solvent methyl ethyl ketone were mixed to prepare a coating solution having the following composition. The obtained coating liquid was made into the coating liquid (L2) which is a cholesteric liquid crystalline mixture.
  • a film (F2) was produced in the same manner as the production of the film (F1) in Example 1 except that the coating liquid (R2) was used instead of the coating liquid (R1), and the coating liquid (L1-1) was used instead.
  • a film (F2b) was produced in the same manner as in the production of the film (F1b-1) in Example 1 except that the coating liquid (L2) was used for the coating liquid, and the coating liquid was used instead of the coating liquid (L1-1). (L2) was used, and the cholesteric liquid crystal phase was applied and fixed in the same manner as in Example 1 except that the film (F2) was used instead of the film (F1), and two layers of cholesteric liquid crystal phase were fixed on the PET film.
  • a cholesteric liquid crystal laminate (G2) was prepared.
  • the produced cholesteric liquid crystal laminate (G2) had no defects or streaks and had a good surface shape.
  • This cholesteric liquid crystal laminate (G2) was used as the cholesteric liquid crystal laminate of Example 4.
  • the cholesteric liquid crystal laminate of Example 4 was evaluated. The results are shown in Table 3 below.
  • the produced cholesteric liquid crystal films (F2) and (F2b) were evaluated in the same manner as in Example 1.
  • Example 5 ⁇ Preparation of cholesteric liquid crystalline mixture (R3)> The following compound 1, compound in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and solvent methyl ethyl ketone were mixed to prepare a coating solution having the following composition. The obtained coating liquid was made into the coating liquid (R1) which is a cholesteric liquid crystalline mixture.
  • cholesteric liquid crystalline mixture (L3) ⁇ Preparation of cholesteric liquid crystalline mixture (L3)> The following compound 1, compound in compound group B, fluorine-based horizontal alignment agent, chiral agent, polymerization initiator, and solvent methyl ethyl ketone were mixed to prepare a coating solution having the following composition. The obtained coating liquid was made into the coating liquid (L3) which is a cholesteric liquid crystalline mixture.
  • a film (F3) was produced in the same manner as the production of the film (F1) in Example 1 except that the coating liquid (R3) was used instead of the coating liquid (R1), and the coating liquid (L1-1) was used instead.
  • a film (F3b) was produced in the same manner as in the production of the film (F1b-1) in Example 1 except that the coating liquid (L3) was used for the coating liquid. Further, instead of the coating liquid (L1-1), the coating liquid was used.
  • a cholesteric liquid crystal phase was applied and fixed in the same manner as in Example 1 except that (L3) was used and the film (F3) was used instead of the film (F1), and two cholesteric liquid crystal phases were fixed on the PET film.
  • a cholesteric liquid crystal laminate (G3) was prepared.
  • the produced cholesteric liquid crystal laminate (G3) had no defects or streaks and had a good surface shape.
  • This cholesteric liquid crystal laminate (G3) was used as the cholesteric liquid crystal laminate of Example 5.
  • the cholesteric liquid crystal laminate of Example 5 was evaluated in the same manner as in Example 1. The results are shown in Table 3 below.
  • the produced cholesteric liquid crystal films (F3) and (F3b) were evaluated in the same manner as in Example 1.
  • the cholesteric liquid crystal laminates of Examples 1 to 5 were obtained by using a relatively small amount of a chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more, no liquid crystal alignment defects, and a haze of the laminate film of 0.5% or less. there were.
  • the HTP of the chiral agent was lower than 30 ⁇ m ⁇ 1, and the selective reflection wavelength was adjusted by increasing the concentration of the chiral agent, resulting in liquid crystal alignment defects and an increase in haze.
  • the selective reflection wavelengths of the cholesteric liquid crystal films (F1b-2), (F1b-3), and (F1b-4) containing the left-turning chiral agent are cholesteric liquid crystal films (F1b1) containing the right-turning chiral agent. ) And both are equal to each other.
  • the selective reflection wavelengths of the cholesteric liquid crystal films (F2b) and (F3b) containing the left-turning chiral agent are the selective reflection wavelengths of the cholesteric liquid crystal films (F2) and (F3) containing the right-turning chiral agent. Each was confirmed to be equal.
  • the selective reflection wavelengths of the light reflection layer containing the left-turning chiral agent and the light reflection layer containing the right-turning chiral agent are equal to each other, and One strong peak was also observed in the transmission spectrum of the body.
  • Example 6 ⁇ Production of cholesteric liquid crystal laminate>
  • rubbing treatment (rayon cloth, pressure: 0.1 kgf, rotation speed: directly on the surface of a PET film (no undercoat layer, manufactured by Fuji Film Co., Ltd., thickness: 50 ⁇ m, size 320 mm ⁇ 400 mm) 1000 rpm, conveyance speed: 10 m / min, number of times: 1 reciprocation)
  • the coating liquid (R4) fixing the cholesteric liquid crystal phase according to the following procedure, and further using the coating liquid (L4)
  • a liquid crystal film formed by fixing two layers of cholesteric liquid crystal phases as light reflecting layers was produced.
  • the coating liquid (R4) was applied on the PET film at room temperature using a wire bar so that the thickness of the dried film was 5 ⁇ m.
  • the mixture was heated in an atmosphere of 90 ° C. for 2 minutes, and then converted into a cholesteric liquid crystal phase at 35 ° C.
  • UV irradiation was performed at an output of 60% for 6 to 12 seconds with an electrodeless lamp “D bulb” (90 mW / cm) manufactured by Fusion UV Systems Co., Ltd. to fix the cholesteric liquid crystal phase.
  • the produced cholesteric liquid crystal film was designated as a cholesteric liquid crystal film (F4).
  • the coating liquid (L4) was applied at room temperature onto the cholesteric liquid crystal film (F4) immobilized in (2) using a wire bar so that the thickness of the dried film was 5 ⁇ m. .
  • (4) After drying at room temperature for 30 seconds to remove the solvent, the mixture was heated in an atmosphere of 90 ° C. for 2 minutes, and then made into a cholesteric liquid crystal phase at 35 ° C. Next, UV irradiation was performed for 6 to 12 seconds at an output of 60% with an electrodeless lamp “D bulb” (90 mW / cm) manufactured by Fusion UV Systems Co., Ltd., and the cholesteric liquid crystal phase was fixed on the PET film.
  • a cholesteric liquid crystal laminate (G4) was prepared by fixing two layers.
  • the prepared cholesteric liquid crystal laminate (G4) had no defects or streaks and had a good surface shape. Further, when the cholesteric liquid crystal laminate (G4) was placed on black paper, a strong selective reflection color was confirmed.
  • a liquid crystal film (F4b) was obtained.
  • the cholesteric liquid crystal laminate shown in Table 5 below was prepared in the same manner as in Example 6 except that the first layer coating solution and the second layer coating solution were changed to those shown in Table 5 below. Produced.
  • the produced cholesteric liquid crystal laminates of Examples 6 to 12 (G4), (G5), (G6), (G7), (G8), (G9), and (G10) have no significant defects or streaks. The condition was good. When placed on black paper, strong selective reflection colors were confirmed for the cholesteric liquid crystal laminates (G4), (G5), (G6), and (G7).
  • the selective reflection wavelengths of the cholesteric liquid crystal films (F5b) to (F10b) containing the left-turning chiral agent are the selective reflection wavelengths of the cholesteric liquid crystal films (F5) to (F10) containing the right-turning chiral agent. Each was confirmed to be equal.
  • Example 13 (Production of cholesteric liquid crystal laminate) A cholesteric liquid crystal phase was applied and fixed on the film (F1) produced in Example 1 in the same manner as in Example 1 except that the coating liquid (R4) was used instead of the coating liquid (L1-1). Furthermore, the cholesteric liquid crystal phase is applied and fixed in the same manner using the coating liquid (L1-1), and finally the cholesteric liquid crystal phase is applied and fixed in the same manner using the coating liquid (L4).
  • a cholesteric liquid crystal laminate (G10-2) obtained by fixing four cholesteric liquid crystal phases on a PET film was prepared. The produced cholesteric liquid crystal laminate (G10-2) had no defects or streaks and had a good surface shape. When the haze value of the cholesteric liquid crystal laminate (G10-2) was measured with a haze meter, the average value measured three times was 0.4 (%).
  • Example 14 (Production of cholesteric liquid crystal laminate) A cholesteric liquid crystal phase was applied and fixed on the film (F1) produced in Example 1 in the same manner as in Example 1 except that the coating liquid (R5) was used instead of the coating liquid (L1-1). Further, a cholesteric liquid crystal phase is sequentially applied and fixed in the same manner using the coating liquid (R7), the coating liquid (L1-1), the coating liquid (L5), and the coating liquid (L7) on the PET film.
  • a cholesteric liquid crystal laminate (G11) was prepared by fixing 6 layers of cholesteric liquid crystal phases. It was confirmed that the produced cholesteric liquid crystal laminate (G11) had no remarkable defects or streaks, had a good surface shape, and exhibited silvery reflection. When the haze value of the cholesteric liquid crystal laminate (G11) was measured with a haze meter, the average value measured three times was 0.6 (%).
  • Example 15 (Production of cholesteric liquid crystal laminates) A cholesteric liquid crystal laminate (G4) prepared in Example 6 was attached to the other adhesive surface on a cholesteric liquid crystal laminate (G1-1) of Example 1 on which a double-sided PSA sheet (PDS-1, manufactured by Lintec) was attached. The coated surfaces were laminated, and the PET film as the base material of the cholesteric liquid crystal laminate (G4) was peeled off to produce a laminated film.
  • PDS-1 double-sided PSA sheet
  • a double-sided pressure-sensitive adhesive sheet (PDS-1, manufactured by Lintec Co., Ltd.) was pasted thereon, and the coated surface of the cholesteric liquid crystal laminate (G6) prepared in Example 8 was bonded to the other adhesive surface to cholesteric liquid crystal laminate (G6 ) Was peeled off to produce a laminated film.
  • the cholesteric liquid crystal laminate (G7) produced in Example 9 was bonded together, and the PET film of the base material of the cholesteric liquid crystal laminate (G7) was peeled off to produce a cholesteric liquid crystal laminate combination (G12). did.
  • the measurement result of the transmission spectrum of the combination G12 of cholesteric liquid crystal laminates produced in Example 15 is shown in FIG.
  • Example 16 (Production of cholesteric liquid crystal laminates) A cholesteric liquid crystal laminate (G4) prepared in Example 6 was attached to the other adhesive surface on a cholesteric liquid crystal laminate (G1-1) of Example 1 on which a double-sided PSA sheet (PDS-1, manufactured by Lintec) was attached. The coated surfaces were laminated, and the PET film as the base material of the cholesteric liquid crystal laminate (G4) was peeled off to produce a laminated film. Further, the cholesteric liquid crystal laminates (G5), (G6), (G7), (G8), (G9), and (G10) are sequentially laminated in the same manner while peeling the PET film of the base material of each cholesteric liquid crystal laminate. A combination (G13) of cholesteric liquid crystal laminates was prepared. The result of measuring the transmission spectrum of the combination G13 of cholesteric liquid crystal laminates produced in Example 16 is shown in FIG.
  • Adhesive layer 12 Base material 14a, 16a Light reflecting layer Xa formed by fixing a cholesteric liquid crystal layer (containing right-turning chiral agent having HTP of 30 ⁇ m ⁇ 1 or more) 14b, 16b Light reflecting layer Xb formed by fixing a cholesteric liquid crystal layer (containing a left-turning chiral agent having an HTP of 30 ⁇ m ⁇ 1 or more) 21 Cholesteric liquid crystal laminate 22 Combination of cholesteric liquid crystal laminate

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  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
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  • Laminated Bodies (AREA)

Abstract

La présente invention concerne des cristaux liquides cholestériques à plusieurs couches qui comprennent au moins une couche réfléchissant la lumière (Xa), qui est une couche réfléchissant la lumière obtenue par fixation d'une phase de cristaux liquides cholestériques et qui contient un agent chiral dextrogyre ayant un HTP d'au moins 30 µm-1, et au moins une couche réfléchissant la lumière (Xb) qui est une couche réfléchissant la lumière obtenue par fixation d'une phase de cristaux liquides cholestériques et qui contient un agent chiral lévogyre ayant un HTP d'au moins 30 µm-1, toutes les couches réfléchissant la lumière (Xa) et toutes les couches réfléchissant la lumière (Xb) ayant une longueur d'onde de réflexion sélective dans la gamme de 400 à 750 nm et la longueur d'onde de réflexion sélective d'au moins une des couches réfléchissant la lumière (Xa) étant égale à la longueur d'onde de réflexion sélective d'au moins une des couches réfléchissant la lumière (Xb), et dans lesquelles toutes les couches réfléchissant la lumière adjacentes obtenues par fixation d'une phase de cristaux liquides cholestériques ont été superposées de façon à se trouver en contact les unes avec les autres. Dans les cristaux liquides cholestériques à plusieurs couches, les couches de cristaux liquides cholestériques dextrogyres et lévogyres, ayant des pouvoirs de torsion contraires, sont superposées de façon à se trouver en contact les unes avec les autres sans application, entre elles, d'un adhésif sensible à la pression. Les cristaux liquides cholestériques à plusieurs couches ont de bonnes propriétés de surface et une bonne transparence, réfléchissent la lumière de manière sélective dans la région de la lumière visible et offrent une haute performance de réflexion.
PCT/JP2013/082726 2012-12-17 2013-12-05 Cristaux liquides cholestériques à plusieurs couches, procédé de fabrication associé et stratifié de cristaux liquides cholestériques à plusieurs couches WO2014097895A1 (fr)

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