[go: up one dir, main page]

WO2019225670A1 - Procédé de production de corps multicouche - Google Patents

Procédé de production de corps multicouche Download PDF

Info

Publication number
WO2019225670A1
WO2019225670A1 PCT/JP2019/020354 JP2019020354W WO2019225670A1 WO 2019225670 A1 WO2019225670 A1 WO 2019225670A1 JP 2019020354 W JP2019020354 W JP 2019020354W WO 2019225670 A1 WO2019225670 A1 WO 2019225670A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
group
coating
mass
coating film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/020354
Other languages
English (en)
Japanese (ja)
Inventor
諭司 國安
洋平 濱地
靖和 桑山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
Original Assignee
Fujifilm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujifilm Corp filed Critical Fujifilm Corp
Publication of WO2019225670A1 publication Critical patent/WO2019225670A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present disclosure relates to a method for manufacturing a laminate.
  • a polarizing element used in a liquid crystal display device can be produced by further providing a polarizing film on an alignment film.
  • Discloses a technique for forming a polarizing layer from a second dry film by polymerizing a conductive smectic liquid crystal compound see, for example, JP-A-2017-102479).
  • the polarizing film is formed by applying a coating liquid containing a desired liquid crystal compound, a dichroic dye and a solvent onto the alignment film and drying it.
  • the liquid crystal compounds are aligned side by side on the alignment film, and the dichroic dyes are aligned side by side along with the aligned liquid crystal compounds.
  • Dichroic dyes tend to be easily crystallized while having the property of being relatively easy to line up. Therefore, in some cases, crystallization may proceed due to a slight change in composition due to a temperature change or solvent volatilization.
  • a coating solution in a low concentration range where the solid content concentration is less than 7% by mass. is used.
  • the dichroic dye is disturbed by agglomerating and overlapping each other. May occur.
  • the arrangement of the dichroic dyes is disturbed, haze is generated and there is a problem that the transparency as an optical element is remarkably impaired.
  • the problem to be solved by one embodiment of the present invention is to provide a method for producing a laminate that can produce a laminate having a low haze.
  • ⁇ 1> a first step of forming a coating film by applying a coating liquid containing a liquid crystalline polymer, a dichroic compound, and a solvent that dissolves the liquid crystalline polymer and the dichroic compound on the alignment film; And a second step of reducing the solvent from the coating film while maintaining the film surface temperature of the coating film at 25 ° C. or higher while the solid content concentration of the coating film is 7 mass% or more and 15 mass% or less. It is a manufacturing method.
  • ⁇ 2> The method for producing a laminate according to ⁇ 1>, wherein the temperature of the coating liquid to be applied is 30 ° C. or higher and 50 ° C. or lower.
  • the alignment film is disposed on the substrate, and in the second step, the temperature of the substrate is set to 30 ° C. or more while the solid content concentration is 15% by mass or less after coating. It is a manufacturing method of the laminated body as described in ⁇ 1> or ⁇ 2> which keeps surface temperature at 25 degreeC or more.
  • the film surface is coated with a gas having a temperature of 30 ° C. or higher from the side opposite to the coating film forming surface of the alignment film while the solid content concentration is 15% by mass or less after coating.
  • the method for producing a laminate according to any one of ⁇ 1> to ⁇ 3>, wherein the temperature is maintained at 25 ° C. or higher.
  • the film surface temperature is set to 25 ° C. or higher by allowing the coating film to pass through a region having an atmospheric temperature of 30 ° C. or higher while the solid content concentration is 15% by mass or less after application.
  • the film surface temperature is maintained at 25 ° C. or higher by applying radiant heat to the coating film with an infrared heater while the solid content concentration is 15% by mass or less from the application ⁇ 1> to ⁇ 3>
  • ⁇ 7> The method for producing a laminate according to any one of ⁇ 1> to ⁇ 6>, wherein the thickness of the coating film formed in the first step is 5 ⁇ m to 50 ⁇ m.
  • a method for manufacturing a laminate that can produce a laminate having a low haze.
  • FIG. 1 is a schematic configuration diagram illustrating a schematic configuration example of a manufacturing apparatus for manufacturing a laminate.
  • FIG. 2 is a schematic configuration diagram illustrating another schematic configuration example of a manufacturing apparatus for manufacturing a laminated body.
  • FIG. 3 is a schematic cross-sectional view showing a schematic configuration of the alignment film forming portion.
  • FIG. 4 is a schematic diagram schematically showing a polarizing film.
  • FIG. 5 is a schematic cross-sectional view showing a schematic configuration of the optical film forming portion.
  • FIG. 6 is a schematic diagram schematically showing the state of the dried coating film after cooling after drying.
  • step in the first step and the second step is not only an independent step, but the intended purpose of the step is achieved even when it cannot be clearly distinguished from other steps. If included, it is included in this term.
  • a numerical range indicated by using “to” indicates a range including the numerical values described before and after “to” as the minimum value and the maximum value, respectively.
  • an upper limit value or a lower limit value described in a numerical range may be replaced with an upper limit value or a lower limit value in another numerical range.
  • the upper limit value or the lower limit value described in a certain numerical range may be replaced with the values shown in the examples.
  • a method for producing a laminate according to the present disclosure includes a coating liquid containing a liquid crystalline polymer, a dichroic compound (also referred to as a dichroic dye), and a solvent that dissolves the liquid crystalline polymer and the dichroic compound. While the first step of coating the alignment film to form a coating film and the solid content concentration of the coating film is 7% by mass or more and 15% by mass or less, the film surface temperature of the coating film is maintained at 25 ° C. or more, A second step of reducing the solvent from the coating film. Moreover, the aspect which further provided other processes other than a 1st process and a 2nd process may be sufficient as the manufacturing method of the laminated body of this indication. In addition, when the code
  • haze refers to the degree of white turbidity.
  • the haze is a value measured in accordance with “Industrial Standard (JIS) K7136: 2000: How to Obtain Haze of Plastics—Transparent Material”. Can be measured.
  • a coating method is known as a method of forming a polarizing film on an alignment film.
  • a coating solution is applied on the alignment film, and, for example, a coating film containing a liquid crystalline polymer, a dichroic compound, and a solvent that dissolves the liquid crystalline polymer and the dichroic compound is formed.
  • the liquid crystal compounds are aligned side by side in response to the alignment surface of the alignment film, and the dichroic compounds are aligned side by side along with the aligned liquid crystal compounds.
  • the dichroic dye may be disordered as a result of aggregation and overlapping. When the arrangement of the dichroic dyes is disturbed, haze is generated and the transparency as an optical element tends to be remarkably impaired.
  • the coating liquid used for coating tends to cause crystallization of components such as a dichroic compound when the solid content concentration is 7% by mass or more.
  • a specific solid content region in the drying process that is, in a region where the solid content concentration is 7% by mass to 15% by mass, Since the distance is close, aggregation (crystallization) of the dichroic compound is particularly likely to occur.
  • the temperature of the coating film is determined in advance in a region where aggregation of the dichroic compound easily occurs, that is, a region where the solid content concentration is 7% by mass to 15% by mass. Maintain in the range (ie 25 ° C. or higher). Thereby, the haze fall by aggregation of components, such as a dichroic compound, is suppressed.
  • the manufacturing apparatus 100 shown in FIG. 1 conveys the long base material 11 in the longitudinal direction, and sequentially from the upstream side in the transport direction Dc that is the longitudinal direction of the base material 11, the alignment film forming section 42 and the optical film forming section 43. And. In the manufacturing apparatus 100, the alignment film 13 is first formed in the alignment film formation unit 42, and the liquid crystal polymer, the dichroic compound, the liquid crystal polymer, and the liquid crystal polymer are formed on the alignment film 13 formed in the next optical film formation unit 43.
  • a coating solution containing a solvent that dissolves the dichroic compound is applied to form a coating film, and the coating film is dried to form the optical film (polarizing film) 14, thereby obtaining the laminate 10.
  • the film surface temperature of the coating film is maintained at 25 ° C. or more from the coating film. Reduce solvent.
  • the laminated body in the present disclosure may be manufactured by a manufacturing apparatus 102 that further includes a first protective layer forming unit 41 and a second protective layer forming unit 44, as shown in FIG.
  • the first protective layer forming unit 41 forms the first protective layer 12 on the substrate 11.
  • the alignment film forming unit 42 forms the alignment film 13 on the first protective layer 12
  • the optical film forming unit 43 forms the optical film (polarizing film) 14 on the alignment film 13 on the first protective film.
  • the second protective layer forming unit 44 forms the second protective layer 15 on the optical film 14 to obtain the stacked body 10.
  • each of the above-described units moves while conveying the long base material 11 in the longitudinal direction using a conveyance mechanism (such as a conveyance roller and a conveyance roller driving mechanism) (not shown).
  • the laminated body 10 is manufactured by forming a film or a layer on the substrate 11 that is present.
  • the laminated body may be manufactured in a long shape as in the above-described manufacturing apparatus, or the obtained long laminated body is cut, although not illustrated. May be manufactured in a sheet form.
  • a coating liquid containing a liquid crystalline polymer, a dichroic compound, a liquid crystalline polymer, and a solvent that dissolves the dichroic compound is applied onto the alignment film to form a coating film.
  • the coating film formed by applying the coating liquid is an optical film having a polarizing function after being dried downstream of the manufacturing process.
  • the coating method is not particularly limited, and examples thereof include a coating method using a coating device such as a die coater, a bar coater, a curtain coater, a gravure coater, a roll coater, or a spin coater.
  • a coating device such as a die coater, a bar coater, a curtain coater, a gravure coater, a roll coater, or a spin coater.
  • the solid content concentration (solid content) of the coating solution used for coating is preferably less than 7% by mass from the viewpoint of suppressing crystallization of components such as a dichroic compound, and among them, 6.5% by mass. % Or less is more preferable, and 6 mass% or less is still more preferable.
  • the lower limit of the solid content concentration of the coating solution is not particularly limited, but is preferably 1% by mass or more from the viewpoint of increasing the solid content concentration and ease of application.
  • the temperature of the coating solution to be applied is preferably in the range of 30 ° C. or more and 50 ° C. or less.
  • the coating film temperature should not be lower than a predetermined temperature range (that is, 25 ° C. or more) in the region where the solid content concentration of the coated film is 7% by mass to 15% by mass. is important. Therefore, by adjusting the temperature of the coating solution to 30 ° C. or more in advance, for example, after leaving the coating device where the temperature of the coating solution is controlled, for example, heat exchange with the base material or heat of vaporization when the solvent is volatilized It is possible to suppress the temperature drop of the coating film caused by the cooling action and the like.
  • the temperature of the coating solution in the above range is suitable for effectively maintaining the temperature of the coating film at 25 ° C. or higher. Moreover, it is advantageous at the point that foaming (boiling) of a coating liquid is suppressed as the temperature of a coating liquid is 50 degrees C or less.
  • the temperature of the coating solution used for coating is more preferably in the range of 30 ° C. or higher and 40 ° C. or lower for the same reason as described above.
  • the temperature of the coating liquid refers to the temperature of the coating liquid existing in the apparatus part in contact immediately before leaving the coating apparatus.
  • the temperature of the coating liquid at the die immediately before leaving the die. is there.
  • the temperature of the coating solution can be measured by a conventional method using a thermometer capable of measuring the liquid temperature.
  • the thickness of the coating film (liquid film) formed on the alignment film can be 1 ⁇ m to 50 ⁇ m, preferably 5 ⁇ m to 50 ⁇ m, and more preferably 5 ⁇ m to 15 ⁇ m.
  • the coating solution contains a liquid crystalline polymer, a dichroic compound, a solvent that dissolves the liquid crystalline polymer and the dichroic compound, and optionally contains other components such as an interface improver or an additive. be able to.
  • the coating liquid in the present disclosure contains at least one liquid crystalline polymer.
  • the liquid crystalline polymer is a polymer having a mesogenic group in the main chain or side chain, and has a flexible main chain 22 and a side chain 24 having a mesogenic group 23 as shown in FIG. 21 is preferred.
  • the mesogenic group is aligned along a certain direction (for example, the X direction in FIG. 4) by the alignment film in the manufacturing process, and the main chain 22 is oriented in the direction perpendicular to the X direction (for example, the Y direction in FIG. 4).
  • the liquid crystalline polymer is arranged in a ladder shape or a network shape, and preferably includes voids including an aggregate 32 including one or two or more dichroic compounds depending on a main chain and a mesogenic group. 26 is formed.
  • liquid crystalline polymer examples include a thermotropic liquid crystalline polymer described in JP2011-237513A, a polymer having thermotropic liquid crystal described in JP2016-4055A, and the like.
  • the liquid crystalline polymer may have a crosslinkable group (for example, acryloyl group, methacryloyl group, etc.) at the terminal.
  • a liquid crystalline polymer having thermotropic properties and crystallinity is preferable.
  • the liquid crystalline polymer having a thermotropic property is a high-molecular liquid crystal compound that exhibits a transition to a liquid crystal phase due to a temperature change.
  • the liquid crystalline polymer may exhibit either a nematic phase or a smectic phase, and preferably exhibits at least a nematic phase from the viewpoint of increasing the degree of alignment of the polarizing film and making it difficult to observe haze.
  • the temperature range showing the nematic phase is preferably room temperature (23 ° C.) to 200 ° C., and more preferably 50 ° C. to 150 ° C. from the viewpoint of handleability and production suitability.
  • a liquid crystalline polymer having crystallinity is a polymer that exhibits a transition to a crystalline layer due to a temperature change.
  • the liquid crystalline polymer having crystallinity may exhibit a glass transition in addition to the transition to the crystal layer.
  • a liquid crystalline polymer is a liquid crystal compound having a transition from a crystal phase to a liquid crystal phase when heated (there may be a glass transition in the middle), or a crystal phase when the temperature is lowered after being brought into a liquid crystal state by heating. It is preferably a liquid crystal compound having a transition to (which may have a glass transition in the middle).
  • the presence or absence of crystallinity of the liquid crystalline polymer is evaluated as follows. Two polarizers of an optical microscope (Nikon Corporation ECLIPSE E600 POL) are arranged so as to be orthogonal to each other, and a sample stage is set between the two polarizers. Then, a small amount of liquid crystalline polymer is placed on the slide glass, and the slide glass is set on the hot stage placed on the sample stage. While observing the state of the sample, the temperature of the hot stage is raised to a temperature at which the liquid crystalline polymer exhibits liquid crystallinity to bring the liquid crystalline polymer into a liquid crystal state.
  • the behavior of the liquid crystal phase transition is observed while gradually decreasing the temperature of the hot stage, and the temperature of the liquid crystal phase transition is recorded.
  • the liquid crystalline polymer exhibits a plurality of liquid crystal phases (for example, a nematic phase and a smectic phase)
  • all the transition temperatures are recorded.
  • DSC differential scanning calorimeter
  • the method for obtaining the crystalline polymer is not particularly limited, and for example, a liquid crystalline polymer containing a structural unit represented by the following formula (1) (also referred to as structural unit (1) in the present specification) is used.
  • a method is preferable, and among them, a method using a preferred embodiment in the liquid crystalline polymer containing the structural unit (1) is more preferable.
  • the crystallization temperature of the liquid crystalline polymer is preferably 0 ° C. or higher and lower than 150 ° C., more preferably 0 ° C. or higher and 120 ° C. or lower, further preferably 15 ° C. or higher and lower than 120 ° C., 15 ° C. It is particularly preferably 95 ° C. or lower.
  • the crystallization temperature of the liquid crystalline polymer is preferably less than 150 ° C. from the viewpoint of reducing haze.
  • the crystallization temperature is obtained from the temperature of the exothermic peak due to crystallization in DSC.
  • the liquid crystalline polymer is preferably a liquid crystalline polymer containing a structural unit (structural unit (1)) represented by the following formula (1).
  • P1 represents the main chain of the structural unit
  • L1 represents a single bond or a divalent linking group
  • SP1 represents a spacer group
  • M1 represents a mesogenic group
  • T1 represents a terminal group.
  • main chain of the structural unit represented by P1 include groups represented by the following formulas (P1-A) to (P1-D).
  • Group represented by the following formula (P1-A) is preferred from the standpoint of properties and easy handling.
  • R 1 represents a hydrogen atom or a methyl group.
  • R 2 represents an alkyl group.
  • the group represented by the formula (P1-A) is preferably a unit of a partial structure of poly (meth) acrylate obtained by polymerizing (meth) acrylate.
  • the group represented by the formula (P1-B) is preferably an ethylene glycol unit obtained by polymerizing ethylene glycol.
  • the group represented by the formula (P1-C) is preferably a propylene glycol unit obtained by polymerizing propylene glycol.
  • the group represented by the formula (P1-D) is preferably a siloxane unit of a polysiloxane obtained by condensation polymerization of silanol.
  • Examples of the divalent linking group represented by L1 include —C (O) O—, —OC (O) —, —O—, —S—, —C (O) NR 3 —, —NR 3 C (O). -, -SO 2- , -NR 3 R 4- and the like.
  • R 3 and R 4 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms which may have a substituent (for example, substituent W described later).
  • P1 is a group represented by the formula (P1-A)
  • L1 is preferably a group represented by —C (O) O—.
  • P1 is a group represented by the formulas (P1-B) to (P1-D)
  • L1 is preferably a single bond.
  • the spacer group represented by SP1 is at least one selected from the group consisting of an oxyethylene structure, an oxypropylene structure, a polysiloxane structure, and a fluorinated alkylene structure, because it easily exhibits liquid crystallinity and availability of raw materials. It is preferable that the structure is included.
  • the oxyethylene structure represented by SP1 is preferably a group represented by * — (CH 2 —CH 2 O) n1 — *.
  • n1 represents an integer of 1 to 20, and * represents a bonding position with L1 or M1 in the formula (1).
  • n1 is preferably an integer of 2 to 10, more preferably an integer of 2 to 4, and most preferably 3.
  • the oxypropylene structure represented by SP1 is preferably a group represented by * — (CH (CH 3 ) —CH 2 O) n2 — *.
  • n2 represents an integer of 1 to 3, and * represents a bonding position with L1 or M1.
  • the polysiloxane structure represented by SP1 is preferably a group represented by * — (Si (CH 3 ) 2 —O) n3 — *.
  • n3 represents an integer of 6 to 10
  • * represents a bonding position with L1 or M1.
  • the fluorinated alkylene structure represented by SP1 is preferably a group represented by * — (CF 2 —CF 2 ) n4 — *.
  • n4 represents an integer of 6 to 10, and * represents a bonding position with L1 or M1.
  • the mesogenic group represented by M1 is a group showing the main skeleton of liquid crystal molecules that contribute to liquid crystal formation.
  • the liquid crystal molecules exhibit liquid crystallinity that is an intermediate state (mesophase) between a crystalline state and an isotropic liquid state.
  • the mesogenic group is not particularly limited. For example, “Flushage Kristall in Tablen II” (VEB Manual Verlag fur Grundoff Industrie, Leipzig, published in 1984), in particular, pages 7 to 16; You can refer to the Liquid Crystal Handbook (Maruzen, published in 2000), especially the description in Chapter 3.
  • As the mesogenic group for example, a group having at least one cyclic structure selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group is preferable.
  • the mesogenic group preferably has an aromatic hydrocarbon group, more preferably has 2 to 4 aromatic hydrocarbon groups, and still more preferably has 3 aromatic hydrocarbon groups.
  • the mesogenic group is preferably a group represented by the following formula (M1-A) or formula (M1-B) from the viewpoints of liquid crystallinity expression, adjustment of liquid crystal phase transition temperature, raw material availability, and synthesis suitability. And a group represented by the formula (M1-B) is more preferable.
  • A1 is a divalent group selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group. These divalent groups may be substituted with a substituent such as an alkyl group, a fluorinated alkyl group, an alkoxy group, or a substituent W described later.
  • the divalent group represented by A1 is preferably a 4- to 6-membered ring.
  • the divalent group represented by A1 may be monocyclic or condensed. * Represents a binding position with SP1 or T1.
  • Examples of the divalent aromatic hydrocarbon group represented by A1 include a phenylene group, a naphthylene group, a fluorene-diyl group, an anthracene-diyl group, and a tetracene-diyl group. From the viewpoint of properties, a phenylene group or a naphthylene group is preferable, and a phenylene group is more preferable.
  • the divalent heterocyclic group represented by A1 may be either aromatic or non-aromatic, and a divalent aromatic heterocyclic group is preferred from the viewpoint of improving the degree of orientation.
  • Examples of atoms other than carbon constituting the divalent aromatic heterocyclic group include a nitrogen atom, a sulfur atom and an oxygen atom.
  • the aromatic heterocyclic group has a plurality of atoms constituting a ring other than carbon, these may be the same or different.
  • divalent aromatic heterocyclic group examples include pyridylene group (pyridine-diyl group), pyridazine-diyl group, imidazole-diyl group, thienylene (thiophene-diyl group), quinolylene group (quinoline-diyl group), Isoquinolylene group (isoquinoline-diyl group), oxazole-diyl group, thiazole-diyl group, oxadiazole-diyl group, benzothiazol-diyl group, benzothiadiazole-diyl group, phthalimido-diyl group, thienothiazole-diyl group, thia Examples include a zolothiazole-diyl group, a thienothiophene-diyl group, and a thienoxazole-diyl group.
  • divalent alicyclic group represented by A1 examples include a cyclopentylene group and a cyclohexylene group.
  • a1 represents an integer of 1 to 10.
  • the plurality of A1s may be the same or different.
  • A2 and A3 each independently represent a divalent group selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group. Specific examples and preferred embodiments of A2 and A3 are the same as those of A1 in the formula (M1-A), and thus description thereof is omitted.
  • a2 represents an integer of 1 to 10, and when a2 is 2 or more, a plurality of A2s may be the same or different, and a plurality of LA1s may be the same or different. Good.
  • a2 is preferably an integer of 2 or more, and more preferably 2.
  • LA1 represents a divalent linking group
  • each of the plurality of LA1 independently represents a single bond or a divalent linking group
  • At least one of LA1 in the above represents a divalent linking group.
  • a2 it is preferable that one of the two LA1s is a divalent linking group and the other is a single bond.
  • the divalent linking group represented by LA1 includes —O—, — (CH 2 ) g —, — (CF 2 ) g —, —Si (CH 3 ) 2 —, — (Si (CH 3 ) 2 O).
  • LA1 may be a group obtained by combining two or more of the above groups. Among these, LA1 is preferably —C (O) O—.
  • M1 include the following structures, for example.
  • “Ac” represents an acetyl group.
  • Examples of the (meth) acryloyloxy group-containing group include, for example, -LA (L represents a single bond or a linking group. Specific examples of the linking group are the same as those of L1 and SP1 described above.
  • A represents (meth) Group represented by acryloyloxy group).
  • T1 is preferably an alkoxy group having 1 to 10 carbon atoms, more preferably an alkoxy group having 1 to 5 carbon atoms, and further preferably a methoxy group.
  • the terminal group may be further substituted with a group exemplified above or a polymerizable group described in JP 2010-244038 A.
  • the number of atoms in the main chain of T1 is preferably 1-20, more preferably 1-15, still more preferably 1-10, and particularly preferably 1-7. When the number of atoms in the main chain of T1 is 20 or less, the degree of orientation of the polarizing film is further improved.
  • the “main chain” in T1 means the longest molecular chain bonded to M1, and hydrogen atoms and branched carbon atoms are not included in the number of atoms in the main chain of T1. For example, when T1 is an n-butyl group, the number of atoms in the main chain is 4, and when T1 is a sec-butyl group, the number of atoms in the main chain is 3.
  • the content of the structural unit (1) is preferably 20% by mass to 100% by mass, more preferably 30% by mass to 99.9% by mass with respect to 100% by mass of all the structural units of the liquid crystalline polymer, and 40% by mass. % To 99.0% by mass is more preferable.
  • the structural unit (1) may be an embodiment in which two or more structural units are included in addition to an embodiment in which the liquid crystalline polymer is included alone. Especially, the aspect in which a liquid crystalline polymer contains 2 types of structural units (1) is preferable.
  • one of the structural units (1) is an alkoxy group at the terminal group represented by T1
  • the other (structural unit B) is The terminal group represented by T1 is preferably a group other than an alkoxy group.
  • the terminal group represented by T1 in the structural unit B is preferably an alkoxycarbonyl group, a cyano group, or a (meth) acryloyloxy group-containing group, and more preferably an alkoxycarbonyl group or a cyano group.
  • the ratio (A / B; mass basis) of the content of the structural unit A to the content of the structural unit B in the liquid crystalline polymer is preferably 50/50 to 95/5, and preferably 60/40 to 93. / 7 is more preferable, and 70/30 to 90/10 is even more preferable.
  • the weight average molecular weight (Mw) of the liquid crystalline polymer is preferably 1,000 to 500,000, and more preferably 2,000 to 300,000.
  • the weight average molecular weight (Mw) of the liquid crystalline polymer is preferably 10,000 or more, and more preferably 10,000 to 300,000.
  • the weight average molecular weight (Mw) of the liquid crystalline polymer is preferably less than 10,000, and more preferably 2,000 or more and less than 10,000.
  • the weight average molecular weight is a value measured by the gel permeation chromatograph (GPC) method under the following conditions.
  • Solvent eluent
  • N-methylpyrrolidone Device name TOSOH HLC-8220GPC
  • Substituent W The substituent W in this specification is demonstrated below.
  • the substituent W include a halogen atom, an alkyl group (for example, a tert-butyl group; including a cycloalkyl group, a bicycloalkyl group, and a tricycloalkyl group), an alkenyl group (including a cycloalkenyl group and a bicycloalkenyl group).
  • a liquid crystalline polymer may be used individually by 1 type, and may use 2 or more types together. There is no restriction
  • the coating liquid in the present disclosure contains at least one dichroic compound.
  • a dichroic compound is a compound having a so-called dichroism, and is a compound that produces a difference in the absorption intensity of each linearly polarized light when irradiated with two linearly polarized lights having different polarization directions by 90 °.
  • the dichroic compound preferably has a property (so-called associative property) in which two or more are bonded in a regular arrangement by intermolecular force under specific conditions. Therefore, as shown in FIG.
  • the dichroic compound 31 when the liquid crystalline polymer traps (captures) the dichroic compound 31 having two or more associative properties in the void 26, the dichroic compound 31 associates in the manufacturing process.
  • the aggregates 32 are formed and aligned, and the alignment is uniform.
  • at least one of the dichroic compound 31 trapped in the gap 26 and the aggregate 32 of the dichroic compound 31 is oriented in the same direction as the mesogenic group 23.
  • dichroic compounds include visible light absorbing materials (dichroic dyes), luminescent materials (fluorescent materials, phosphorescent materials), ultraviolet absorbing materials, infrared absorbing materials, nonlinear optical materials, carbon nanotubes, and inorganic materials (eg, quantum rods).
  • dichroic dyes visible light absorbing materials
  • luminescent materials fluorescent materials, phosphorescent materials
  • ultraviolet absorbing materials infrared absorbing materials
  • nonlinear optical materials carbon nanotubes
  • inorganic materials eg, quantum rods
  • a conventionally known dichroic substance can be used.
  • Examples of the dichroic compound include paragraphs [0067] to [0071] of JP 2013-228706 A, paragraphs [0008] to [0026] of JP 2013-227532 A, and JP 2013-209367 A.
  • the dichroic material may have a crosslinkable group.
  • the crosslinkable group include (meth) acryloyl group, epoxy group, oxetanyl group, styryl group and the like, and (meth) acryloyl group is preferable. Specific compound examples are shown below.
  • Two or more dichroic compounds may be used in combination, for example, at least one dichroic compound having a maximum absorption wavelength in the wavelength range of 370 nm to 550 nm and a maximum absorption wavelength in the wavelength range of 500 nm to 700 nm. It is preferable that at least one dichroic compound having a combination is used.
  • a dichroic compound may be used individually by 1 type, and may use 2 or more types together. There is no restriction
  • the coating liquid in the present disclosure contains at least one solvent that dissolves at least the liquid crystalline polymer and the dichroic compound.
  • solvent examples include ketone solvents (eg, acetone, 2-butanone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, etc.), ether solvents (eg, dioxane, tetrahydrofuran, cyclopentyl methyl ether, etc.), aliphatic hydrocarbons.
  • ketone solvents eg, acetone, 2-butanone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, etc.
  • ether solvents eg, dioxane, tetrahydrofuran, cyclopentyl methyl ether, etc.
  • aliphatic hydrocarbons examples of the solvent.
  • Solvent for example, hexane
  • alicyclic hydrocarbon solvent for example, cyclohexane
  • aromatic hydrocarbon solvent for example, benzene, toluene, xylene, trimethylbenzene, etc.
  • halogenated carbon solvent for example, dichloromethane)
  • Trichloromethane chloroform
  • dichloroethane dichlorobenzene
  • chlorotoluene etc.
  • ester solvents eg, methyl acetate, ethyl acetate, butyl acetate, etc.
  • alcohol solvents eg, ethanol, isopropanol, butanol, sucrose
  • cellosolve solvents eg, methyl cellosolve, ethyl cellosolve, and 1,2-dimethoxyethane
  • cellosolve acetate solvents eg, sulfoxide solvents (eg, dimethyl sul
  • a solvent may be used individually by 1 type and may use 2 or more types together.
  • the content of the solvent in the coating solution is preferably 70% by mass to 99.5% by mass, more preferably 80% by mass to 99% by mass, and more preferably 85% by mass to 97% by mass with respect to the total mass of the coating solution. Is more preferable.
  • the coating liquid in the present disclosure preferably includes an interface improver.
  • the interface improving agent By including the interface improving agent, the surface smoothness of the coating film is improved, the degree of orientation is improved, the occurrence of cissing and unevenness is suppressed, and the uniformity of orientation in the plane is expected to be improved.
  • the interface improver those that orient liquid crystal polymers are preferable.
  • the compounds (horizontal alignment agents) described in paragraphs [0253] to [0293] of JP2011-237513A and JP2007-272185A are disclosed.
  • fluorine (meth) acrylate polymers described in paragraphs [0018] to [0043].
  • the content of the interface improver is 0.001 mass relative to a total of 100 parts by mass of the liquid crystalline polymer and the dichroic compound in the coating liquid in the present disclosure. Part to 5 parts by weight, preferably 0.01 part to 3 parts by weight.
  • the coating liquid can contain components other than those described above. Examples of other components include a polymerization initiator and various additives.
  • the compound (namely, photoinitiator) which has photosensitivity is preferable.
  • the photopolymerization initiator is not particularly limited, and examples thereof include ⁇ -carbonyl compounds (compounds described in US Pat. No. 2,367,661 or US Pat. No. 2,367,670) and acyloin ethers (US Pat. No. 2,448,828). Compound), ⁇ -hydrocarbon substituted aromatic acyloin compound (compound described in US Pat. No. 2,722,512), polynuclear quinone compound (US Pat. No. 3,046,127 or US Pat. No.
  • the content of the polymerization initiator in the coating liquid is 0.01 parts by mass to 30 parts by mass with respect to 100 parts by mass in total of the liquid crystalline polymer and the dichroic compound.
  • 0.1 to 15 parts by mass is more preferable.
  • the content of the polymerization initiator is 0.01 parts by mass or more, the durability of the polarizing film becomes better, and when it is 30 parts by mass or less, the orientation of the polarizing film becomes better.
  • the optical film (polarizing film) 14 is formed on the alignment film 13 by sequentially passing through the alignment film forming unit 42 and the optical film forming unit 43.
  • the laminated body made can be manufactured.
  • the alignment film forming part 42 includes a coating film forming part 61, a drying part 62, and a light irradiation part 63.
  • the coating film forming unit 61 is formed on the base material 11 (the first protective layer 12 provided on the base material 11 when the manufacturing apparatus 102 shown in FIG. 2 is used).
  • a coating film 67 is formed by applying a photoisomerization coating liquid 66 containing the above solvent.
  • the photoisomerization coating solution 66 is a solution in which an azo compound is dissolved in a solvent.
  • the drying unit 62 reduces the solvent from the coating film 67 by heating, blowing, natural drying, or a combination of these methods, and drying the coating film 67, thereby forming the photoisomerized film 68 that is a dry coating film. Form long.
  • the light irradiation unit 63 provided downstream of the drying unit 62 in the transport direction Dc is for forming the alignment film 13.
  • the light irradiation unit 63 includes a plurality of light sources 71 and a polarizer unit 72.
  • a plurality of light sources 71 are provided in a state of being arranged in the depth direction of the paper surface of FIG. 3, and the plurality of light sources 71 extend in the depth direction of the paper surface of FIG.
  • the support member 73 is supported.
  • the light source unit 76 includes a light source 71, a support member 73, a chamber 74, a cover glass 75, and the like.
  • the light source 71 may be an LED (light emitting diode). LEDs generate less heat than metal halide lamps and mercury lamps. Therefore, deformation of the polarizer unit 72 is further suppressed even when continuous irradiation is performed, that is, when irradiation is performed for a long time. As a result, an alignment film having a highly uniform alignment degree in the longitudinal direction is obtained.
  • the polarizer unit 72 is disposed between the light source 71 and the transport path.
  • the polarizer unit 72 includes a reflective polarizer, and makes light emitted from the light source 71 linearly polarized light.
  • the photoisomerization film 68 being conveyed formed on the substrate 11 passes through the light irradiation unit 63, so that linearly polarized light is irradiated to the photoisomerization film 68.
  • the azo compound contained in the photoisomerization film 68 is photoisomerized and aligned, and the alignment film 13 is generated.
  • the azo compound is isomerized from the trans form to the cis form.
  • the alignment film can be formed as described above.
  • the formed alignment film can also make the degree of alignment in the polarizing film, which is an optical film laminated on the alignment film, uniform in the longitudinal direction.
  • the next optical film forming unit 43 includes a coating film forming unit 91, a drying unit 92, and a temperature management unit 93.
  • a coating solution 94 containing a liquid crystalline polymer, a dichroic compound, and a solvent for dissolving the liquid crystalline polymer and the dichroic compound is continuously applied.
  • the coating film 96 for forming the polarizing film which is an optical film is formed on the alignment film.
  • the drying of the coating film will be described in detail in the second step below.
  • the coating liquid 94 is in a state where the liquid crystalline polymer and the dichroic compound are dissolved in a solvent.
  • the film surface temperature of the coating film is kept at 25 ° C. or more while the solid content concentration (solid content amount) of the coating film formed in the first step is 7% by mass or more and 15% by mass or less. Reduce the solvent from the coating. That is, the coating film is dried in a solid concentration range where components such as a dichroic compound are likely to be crystallized in a temperature range of 25 ° C. or higher.
  • a coating film containing a liquid crystalline polymer, a dichroic compound, and a solvent for dissolving them when the solid content concentration of the coated film (for example, in the drying process) is 7% by mass or more, the intermolecular distance of the components Therefore, the aggregation (crystallization) of components such as a dichroic compound tends to occur, and haze tends to occur. Therefore, in the area
  • the film surface temperature of the coating film is kept at 25 ° C. or higher in the region where the solid content concentration is 15% by mass or less.
  • the film surface temperature of the coating film is preferably maintained at 27 ° C. or higher, more preferably 28 ° C. or higher.
  • the film surface temperature of the coating film is a value measured using a radiation thermometer whose emissivity is calibrated with a temperature value measured with a non-contact thermometer.
  • the measurement is performed in a state where there is no reflector within 10 cm from the surface on the opposite side (back side) to the measurement surface.
  • the solid content concentration of the coating film can be measured online by measuring the optical thickness from the point of application to the dry film using an infrared spectral interference film thickness meter SI-T80 manufactured by Keyence Corporation. Specifically, first, the optical thickness from the time of application to the dry film is measured. Next, the thickness of the dried film (dry film) is measured with a contact-type thickness meter. The thickness of the measured dry film is divided by the optical thickness, and the thickness of the wet film (coating film) is calculated from the optical thickness. Then, the amount of solvent at the measurement point is obtained. Solvent mass is calculated
  • the method for maintaining the film surface temperature of the coating film at 25 ° C. or higher is not particularly limited, and can be appropriately selected from methods for raising the film surface temperature of the coating film.
  • the method is not limited to the method in which the film surface of the coating film is directly heated to set the film surface temperature to 25 ° C. or higher, but the exposed surface is heated from the side opposite to the film surface exposed through the coating film. And a method of heating the inside of the film to raise the film surface temperature to 25 ° C. or higher.
  • the solid content concentration of the coating film is 15 after coating. It is preferable that the film surface temperature of the coating film be kept at 25 ° C. or higher by setting the temperature of the base material to 30 ° C. or higher while the content is less than or equal to mass%. That is, a coating film is formed on a substrate having a temperature of 30 ° C. or higher. Thereby, the liquid temperature fall of the coating liquid which occurs when the coating liquid contacts the alignment film or after the contact is suppressed, and the film surface temperature of the coating film is easily kept at 25 ° C. or more.
  • “from application” means the time after the application of the application liquid to the alignment film is started. The same applies to the following.
  • the temperature of the substrate can be obtained by measuring the temperature of the surface of the substrate opposite to the side where the alignment film is disposed. Specifically, it can be performed by a method in which a thermocouple is brought into contact with the surface of the substrate opposite to the side on which the alignment film is disposed, a method in which measurement is performed using a non-contact type thermometer, or the like.
  • a base material that has been heated to 30 ° C. or higher in advance may be used, or the transported base material may be heated before application. You may adjust temperature to 30 degreeC or more.
  • the gas at a temperature of 30 ° C. or higher is opposite to the coating film forming surface of the alignment film while the solid content concentration of the coating film is 15% by mass or less after coating. It is preferable to keep the film surface temperature at 25 ° C. or higher by applying to the surface.
  • a gas having a temperature of 30 ° C. or higher is allowed to flow on the opposite side of the substrate on which the alignment film is disposed (that is, on the opposite side of the alignment film to the coating surface).
  • the film surface temperature is preferably kept at 25 ° C. or higher.
  • Inert gas such as air and nitrogen gas, etc. can be used.
  • a method of applying a gas having a temperature of 30 ° C. or higher to the substrate for example, a method using a warm air heater may be mentioned.
  • the film surface temperature of the coating film is 15% by mass or less after coating, it is preferable to keep the film surface temperature at 25 ° C. or higher by passing the coating film through a region where the ambient temperature is 30 ° C. or higher.
  • the components in the coating film are likely to be crystallized, so that the coating film is passed through an atmosphere heated to 30 ° C. or higher. Is preferred. Thereby, since the atmosphere of 30 ° C. or higher is in direct contact with the film surface, the film surface temperature is easily maintained at 25 ° C. or higher.
  • the atmospheric temperature may be appropriately selected according to the temperature of the coating film, the conveyance distance in the region where the atmospheric temperature is 30 ° C. or higher, the conveyance speed, and the like.
  • the upper limit of atmospheric temperature it is the temperature which does not produce thickness nonuniformity in a coating film, and it is preferable to consider the boiling point of the solvent contained in a coating film.
  • the upper limit of the atmospheric temperature can be, for example, 80 ° C. or less, preferably 50 ° C. or less, and more preferably 45 ° C. or less.
  • Examples of the region where the atmospheric temperature is 30 ° C. or higher include a drying chamber or a drying zone in which the temperature of the internal air atmosphere is adjusted to 30 ° C. or higher.
  • a method for adjusting the atmospheric temperature to 30 ° C. or higher a method of supplying air or the like heated to 30 ° C. or higher to a drying chamber or a drying zone, and an atmosphere inside the drying chamber or drying zone are added using a heater. The method of heating etc. are mentioned.
  • the film surface temperature is also preferable to keep the film surface temperature at 25 ° C. or higher by applying radiant heat to the coating film with an infrared heater while the solid content concentration of the coating film is 15% by mass or less after coating.
  • an infrared heater commercially available products can be appropriately selected and used.
  • the coating film is formed.
  • a specific region that is, a region of 7% by mass or more and 15% by mass or less
  • the surface temperature is kept at 25 ° C. or more
  • the drying method of the coating film there is no particular limitation on the drying method of the coating film, and drying can be promoted by appropriately applying a known method.
  • the drying temperature when the solid content concentration of the coating film is not in a specific region can be in the range of 30 ° C to 200 ° C.
  • the drying time after the solid content concentration of the coating exceeds 15% by mass is not particularly limited, and is preferably 0.1 minute to 10 minutes, more preferably 0.2 minutes to 5 minutes. is there.
  • the coating film 96 on the alignment film by the optical film forming unit 43 is dried.
  • a solvent is reduced from the coating film 96 by the method of heating, ventilation, natural drying, or the method which combined these methods.
  • the film surface temperature of a coating film shall be 25 degreeC or more during the period when the solid content concentration of a coating film is 7 mass% or more and 15 mass% or less with respect to the coating film on an orientation film.
  • a process of reducing the solvent from the coating film while maintaining the condition is provided.
  • a laminate having a polarizing film with low haze can be obtained.
  • the temperature management unit 93 in the optical film forming unit 43 raises or lowers the temperature of the dried coating 97, which is a coating with reduced solvent, or maintains a specific temperature band.
  • the dry coating film 97 is aged.
  • the temperature management unit 93 is responsible for temperature management, the orientation of the liquid crystalline polymer and the dichroic compound in the dry coating film 97 is more precisely adjusted.
  • the polarizing film 14 which is an optical film having a function as a polarizer is obtained.
  • the solvent may remain in the dry coating film at the end of the drying process.
  • symbol 110 in FIG. 5 is an intermediate
  • the liquid crystalline polymer 21 is solidified while the mesogenic group 23 approaches a regular alignment state according to the alignment film 13 more strictly as shown in FIG. As a result, the air gap 26 becomes clearer.
  • the dichroic compound 31 follows the alignment direction of the mesogenic groups 23 in the voids 26 and is solidified while maintaining a substantially constant alignment state, and is in a phase-separated state with respect to the liquid crystalline polymer 21. As a result, the dried coating film 97 obtains a function as a uniform polarizer as a whole.
  • the mesogenic group 23 of the liquid crystalline polymer 21 is gradually moved while maintaining the alignment state of the liquid crystalline polymer 21 and the dichroic compound 31 (see FIG. 6). Get sex.
  • the mesogenic group 23 follows the alignment film better.
  • the dichroic compound becomes mobile when the association promotion temperature is reached beyond the crystallization temperature, but the other dichroic compounds in the same void 26 are not removed without removing the void 26 formed by the mesogenic group or the like. The probability of contact with a sex compound increases. As a result, the association of the dichroic compounds proceeds in each void 26, and the degree of orientation of the dried coating film 97 is further improved as shown in FIG.
  • the 1st protective layer formation part 41 is provided before the above-mentioned 1st process and 2nd process, and the above-mentioned 1st process.
  • the 2nd protective layer formation part 44 is provided after a 2nd process.
  • the first protective layer forming unit 41 includes a coating film forming unit and a drying unit (not shown).
  • the coating film forming unit continuously applies a coating solution in which, for example, polyvinyl alcohol (PVA) is dissolved in a solvent on the base material 11 moving in the transport direction Dc to form a coating film.
  • PVA polyvinyl alcohol
  • the drying unit reduces the solvent from the coating film by heating, blowing, natural drying, or a combination of these methods, and dries the coating film to form the first protective layer on the substrate 11.
  • the 2nd protective layer formation part 44 is provided with the coating-film formation part and drying part which are not shown in figure.
  • the coating film forming unit is a polarizing film that is an optical film by applying a coating solution containing an epoxy monomer polymer that is a material for forming the second protective layer, and a solvent that dissolves the epoxy monomer polymer. Apply on the film to form a coating.
  • a drying part reduces a solvent from a coating film by the method of heating, ventilation, natural drying, or these methods, and dries a coating film, and forms a 2nd protective layer on a polarizing film.
  • the laminate in the present disclosure can be manufactured.
  • the laminate in the present disclosure preferably includes a substrate, an alignment film provided on the substrate, and a polarizing film provided on the alignment film.
  • the laminate in the present disclosure may further have a ⁇ / 4 plate on the polarizing film.
  • the laminate in the present disclosure may further have a barrier layer between the polarizing film and the ⁇ / 4 plate. Since the polarizing film is as described above, the description thereof is omitted.
  • each layer in the laminate in the present disclosure will be described.
  • a base material it can select suitably, For example, glass and a polymer film are mentioned.
  • the light transmittance of the substrate is preferably 80% or more.
  • a polymer film it is preferable to use an optically isotropic polymer film.
  • the base material include polyester base materials (polyethylene terephthalate, polyethylene naphthalate films or sheets), cellulose base materials (diacetyl cellulose, triacetyl cellulose (TAC) films or sheets), polycarbonate base materials, and the like.
  • Poly (meth) acrylic base materials (polymethyl methacrylate film or sheet), polystyrene base materials (polystyrene, acrylonitrile styrene copolymer film or sheet), olefin base materials (polyethylene, polypropylene, cyclic or Polyolefin or ethylene propylene copolymer film or sheet having a norbornene structure), polyamide base material (polyvinyl chloride, nylon, aromatic polyamide film or sheet) G), polyimide base material, polysulfone base material, polyether sulfone base material, polyether ether ketone base material, polyphenylene sulfide base material, vinyl alcohol base material, polyvinylidene chloride base material, polyvinyl butyral base Examples thereof include a base material, a transparent base material such as a poly (meth) acrylate base material, a polyoxymethylene base material, and an epoxy resin base material, or a base material made of a blend poly
  • JP-A-2002-22294 can be applied. Moreover, even if it is a polymer which is easy to express birefringence, such as a conventionally known polycarbonate and polysulfone, the one whose expression is lowered by modifying the molecule described in International Publication No. 2000/26705 should be used. You can also.
  • the alignment film is a film for aligning a liquid crystalline polymer.
  • a rubbing treatment of an organic compound (preferably a polymer) on the film surface, oblique deposition of an inorganic compound, formation of a layer having a microgroove, or Langmuir jet It can be formed by means such as accumulation of organic compounds (eg, ⁇ -tricosanoic acid, dioctadecylmethylammonium chloride, methyl stearylate) by the method (LB film).
  • an alignment film in which an alignment function is generated by application of an electric field, application of a magnetic field, or light irradiation is also known.
  • an alignment film (photo-alignment film) formed by light irradiation is preferable from the viewpoint of alignment uniformity.
  • Rubbing treatment alignment film examples of the polymer material used for the alignment film formed by rubbing treatment include polyvinyl alcohol or a derivative thereof, polyimide or a derivative thereof.
  • the thickness of the rubbing-treated alignment film is preferably 0.01 ⁇ m to 10 ⁇ m, and more preferably 0.01 ⁇ m to 1 ⁇ m.
  • Photo-alignment film examples include, for example, JP-A-2006-285197, JP-A-2007-76839, JP-A-2007-138138, JP 2007-94071 A, JP 2007-121721 A, JP 2007-140465 A, JP 2007-156439 A, JP 2007-133184 A, JP 2009-109831 A, Patent No. 3883848. Azo compounds described in JP-A No. 4151746, aromatic ester compounds described in JP-A No. 2002-229039, light described in JP-A No. 2002-265541 or JP-A No.
  • the photo-alignment film can be produced by irradiating a film (photoisomerization film) formed using the photo-alignment material with linearly polarized light or non-polarized light. Irradiation with linearly polarized light or non-polarized light is an operation for causing a photoreaction in the photoalignment material.
  • the wavelength of light varies depending on the photo-alignment material and is not particularly limited as long as it is a wavelength necessary for the photoreaction.
  • the peak wavelength of light used for light irradiation is preferably 200 nm to 700 nm, and more preferably ultraviolet light having a peak wavelength of light of 400 nm or less.
  • Examples of the light source used for light irradiation include lamps (for example, tungsten lamps, halogen lamps, xenon lamps, xenon flash lamps, mercury lamps, mercury xenon lamps, and carbon arc lamps), laser light sources (for example, semiconductor lasers, helium neon). Laser, argon ion laser, helium cadmium laser, YAG (yttrium, aluminum, garnet) laser, etc.), light emitting diode, and cathode ray tube.
  • lamps for example, tungsten lamps, halogen lamps, xenon lamps, xenon flash lamps, mercury lamps, mercury xenon lamps, and carbon arc lamps
  • laser light sources for example, semiconductor lasers, helium neon.
  • light emitting diode and cathode ray tube.
  • a method using a polarizing plate for example, an iodine polarizing plate, a dichroic material polarizing plate, a wire grid polarizing plate, etc.
  • a prism system element for example, a Glan-Thompson prism
  • a Brewster angle is used.
  • a method using light emitted from a laser light source having polarized light is used.
  • the light irradiation may be performed by a method of irradiating light from the top surface or the back surface to the alignment film from the vertical or oblique direction to the alignment film surface.
  • the incident angle of light varies depending on the photo-alignment material, but is preferably 0 ° to 90 ° (vertical), more preferably 40 ° to 90 °.
  • non-polarized light it is preferable to irradiate the alignment film with non-polarized light obliquely.
  • the incident angle is preferably 10 ° to 80 °, more preferably 20 ° to 60 °, and still more preferably 30 ° to 50 °.
  • the light irradiation time is preferably 1 minute to 60 minutes, and more preferably 1 minute to 10 minutes.
  • the ⁇ / 4 plate is a plate having a ⁇ / 4 function, and specifically, a plate having a function of converting linearly polarized light having a specific wavelength into circularly polarized light (or circularly polarized light into linearly polarized light).
  • a stretched polymer film, a retardation film having an optically anisotropic layer having a ⁇ / 4 function on a support, and the like can be mentioned.
  • a broadband ⁇ / 4 plate in which a ⁇ / 4 plate and a ⁇ / 2 plate are laminated can be cited.
  • the ⁇ / 4 plate and the polarizing film may be provided in contact with each other, or another layer may be provided between the ⁇ / 4 plate and the polarizing film.
  • the other layer include a pressure-sensitive adhesive layer or an adhesive layer for ensuring adhesion, or a barrier layer.
  • the barrier layer is provided between the polarizing film and the ⁇ / 4 plate.
  • a barrier layer is between a polarizing film and other layers, for example. Can be provided.
  • the barrier layer is also called a gas barrier layer or an oxygen barrier layer, and has a function of protecting the polarizing film from a gas such as oxygen in the atmosphere and moisture, or a compound contained in an adjacent layer.
  • the barrier layer for example, paragraphs [0014] to [0054] of JP-A-2014-159124, paragraphs [0042] to [0075] of JP-A-2017-121721, paragraph of JP-A-2017-115076 [0045] to [0054], paragraphs [0010] to [0061] of JP 2012-213938 A, paragraphs [0021] to [0031] of JP 2005-169994 A can be referred to.
  • the display element provided in the image display device is not particularly limited, and examples thereof include a liquid crystal cell, an organic electroluminescence (sometimes abbreviated as “EL”) display panel, and a plasma display panel.
  • a liquid crystal cell or an organic EL display panel is preferable. That is, as the image display device, a liquid crystal display device using a liquid crystal cell as a display element and an organic EL display device using an organic EL display panel as a display element are preferable.
  • liquid crystal display device which is an example of the image display device
  • an embodiment having a polarizing film and a liquid crystal cell is preferably mentioned, and more preferably, a laminate (provided not having a ⁇ / 4 plate) and a liquid crystal cell in the present disclosure.
  • a liquid crystal display device having the aspect provided with the laminated body in this indication as a polarizing element of a front side among the polarizing elements provided in the both sides of a liquid crystal cell is preferable, and the aspect provided with the laminated body in this indication as a polarizing element of a front side and a rear side Is more preferable.
  • the liquid crystal cell used in the liquid crystal display device is preferably in a VA (Vertical Alignment) mode, an OCB (Optically Compensated Bend) mode, an IPS (In-Plane-Switching) mode, or a TN (Twisted Nematic) mode. It is not limited to these.
  • a TN mode liquid crystal cell rod-like liquid crystal molecules are substantially horizontally aligned when no voltage is applied, and are twisted and aligned at 60 to 120 °.
  • a TN mode liquid crystal cell is most frequently used as a color TFT (Thin Film Transistor) liquid crystal display device, and is described in many documents.
  • a VA mode liquid crystal cell rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied.
  • the VA mode liquid crystal cell includes: (1) a narrowly defined VA mode liquid crystal cell in which rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied, and substantially horizontally when a voltage is applied (Japanese Patent Laid-Open No. Hei 2-). In addition to 176625, see (2) Liquid crystal cell (SID97, Digest of tech. Papers 28 (1997) 845) in which the VA mode is multi-domained (in MVA mode) for widening the viewing angle.
  • a liquid crystal cell in which rod-like liquid crystalline molecules are substantially vertically aligned when no voltage is applied and twisted multi-domain alignment is applied when a voltage is applied (Preliminary collections 58-59 of the Japan Liquid Crystal Society) (See 1998)), and (4) SURVIVAL mode liquid crystal cells (see the presentation at LCD International 98).
  • any of a PVA (Patterned Vertical Alignment) type, a photo-alignment type (Optical Alignment), and a PSA (Polymer-Stained Alignment) may be used. Details of the modes are described in JP-A-2006-215326 and JP-T-2008-538819.
  • JP-A-10-54982, JP-A-11-202323, and JP-A-9-292522 are methods for reducing leakage light during black display in an oblique direction and improving the viewing angle using an optical compensation sheet. No. 11-133408, No. 11-305217, No. 10-307291, and the like.
  • an organic EL display device which is an example of an image display device, for example, an aspect having a polarizing film, a ⁇ / 4 plate, and an organic EL display panel in this order from the viewing side is preferable, and more preferably.
  • the laminated body in the present disclosure having a ⁇ / 4 plate and the organic EL display panel are arranged in this order.
  • the laminated body has a base material, an alignment film, a polarizing film, a barrier layer provided as necessary, and a ⁇ / 4 plate arranged in this order from the viewing side.
  • the organic EL display panel is a display panel using an organic EL element in which an organic light emitting layer (organic electroluminescence layer) is sandwiched between electrodes (between a cathode and an anode).
  • organic light emitting layer organic electroluminescence layer
  • the weight average molecular weight is a value measured by the gel permeation chromatograph (GPC) method under the aforementioned conditions.
  • Example 1 As a substrate, a long triacetyl cellulose (TAC) film having a thickness of 40 ⁇ m was prepared. The TAC film was loaded into the production apparatus shown in FIG. 2, and a laminate was produced as follows.
  • TAC triacetyl cellulose
  • a first protective layer-forming coating solution having the following composition was prepared, and the first protective layer-forming coating solution was applied onto a TAC film and dried to form a first protective layer having a dry thickness of 1.3 ⁇ m.
  • an alignment film forming coating solution having the following composition was prepared, and the alignment film forming coating solution was applied onto the first protective layer and dried to form a photoisomerized film. Thereafter, the photoisomerized film is irradiated with linearly polarized ultraviolet rays (illuminance: 4.5 mW, irradiation amount: 500 mJ / cm 2 ) using a polarized ultraviolet exposure apparatus, and azobenzene is photoisomerized and oriented. An alignment film having a thickness of 0.3 ⁇ m was formed.
  • Photo-alignment material having the following structure: 0.3 parts by mass 2-butoxyethanol: 41.6 parts by mass Dipropylene glycol monomethyl ether: 41.6 parts by mass Pure water: 16.5 parts by mass
  • a polarizing film forming coating solution having the following composition was prepared, and the polarizing film forming coating liquid adjusted to 27 ° C. was applied onto the alignment film with a die coater, and the coating film having a liquid film thickness of 5.1 ⁇ m. Formed.
  • the film surface temperature of the coating film was maintained at 25 ° C. while the solid content concentration was 7 mass% to 15 mass%. It was. After the solid content concentration exceeded 15% by mass, the coating film was heated to raise the film surface temperature to 140 ° C. and held for 30 seconds, after which the heating was stopped and the coating film was cooled to room temperature. In this way, a polarizing film was formed on the alignment film.
  • the measurement of the solid content concentration of the coating film was performed using an infrared spectral interference film thickness meter (SI-T80, manufactured by Keyence Corporation). Was measured online, and the thickness of the dried film (dry film) was further measured with a contact-type thickness meter. The thickness of the measured dry film was divided by the optical thickness, the thickness of the coating film (wet film) was calculated from the optical thickness, and the amount of solvent at the measurement point was obtained. The solvent mass was calculated
  • the film surface temperature of the coating film was measured using a radiation thermometer (FT-H10, manufactured by Keyence Corporation) whose emissivity was calibrated with the temperature value measured with a non-contact thermometer.
  • FT-H10 radiation thermometer
  • a coating solution for forming a second protective layer having the following composition was prepared, and the coating solution for forming the second protective layer was applied onto the polarizing film and dried to form a second protective layer having a dry thickness of 0.7 ⁇ m. .
  • the haze was measured with the following method. The measurement results are shown in Table 1. Using a haze meter (NDH2000) manufactured by Nippon Denshoku Industries Co., Ltd., the measurement was performed in accordance with JIS K7136: 2000 “How to determine haze of plastic and transparent material”. The haze value is a practically acceptable range of 1.0% or less.
  • Example 1 Comparative Example 1
  • Example 2 Comparative Example 1
  • Example 2 Comparative Example 1
  • a laminate was prepared in the same manner as in Example 1, and the same measurements and evaluations were made. Went. The results of measurement and evaluation are shown in Table 1.
  • Example 4 In Example 1, a portion of the substrate where the coating liquid is transferred from the die coater (coating portion) by applying hot air of 30 ° C. to the surface of the TAC film that is the substrate opposite to the surface on which the coating film is formed A laminate was prepared in the same manner as in Example 1 except that the temperature of the base material at the time when the coating solution was transferred to the coated part was adjusted to 30 ° C., and the same measurement and evaluation were performed. The results of measurement and evaluation are shown in Table 1.
  • Example 5 In Example 1, it was the same as Example 1 except that the coating film was passed through a drying zone having an air atmosphere of 30 ° C. from the time of application until the solid content concentration of the coating film reached 15% by mass. Then, a laminate was prepared, and the same measurement and evaluation were performed. The results of measurement and evaluation are shown in Table 1.
  • Example 6 In Example 1, a laminate was prepared in the same manner as in Example 1 except that the coating film was radiantly dried with an infrared heater until the solid content concentration of the coating film reached 15% by mass from the time of application. Similar measurements and evaluations were made. The results of measurement and evaluation are shown in Table 1.
  • the laminated body in this indication can be used as a polarizing element (polarizing plate), for example, and is suitable as a linear polarizing plate or a circularly polarizing plate, for example.
  • polarizing plate polarizing plate
  • the laminate in the present disclosure does not have an optically anisotropic layer such as a ⁇ / 4 plate
  • the laminate in the present disclosure can be used as a linear polarizing plate.
  • the laminated body in this indication has (lambda) / 4 board
  • the laminated body in this indication can be used as a circularly-polarizing plate.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

Un mode de réalisation de la présente invention concerne un procédé de production d'un corps multicouche, qui comprend : une première étape dans laquelle un liquide de revêtement, qui contient un polymère à cristaux liquides, un composé dichroïque et un solvant dans lequel sont dissous le polymère à cristaux liquides et le composé dichroïque, est appliqué sur un film d'alignement, formant ainsi un film de revêtement ; et une seconde étape dans laquelle le solvant dans le film de revêtement est éliminé en maintenant la température de surface de film du film de revêtement à une température supérieure ou égale à 25 °C pendant que la concentration du contenu en extrait sec du film de revêtement passe de 7 % en masse à 15 % en masse (inclus).
PCT/JP2019/020354 2018-05-23 2019-05-22 Procédé de production de corps multicouche Ceased WO2019225670A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-099021 2018-05-23
JP2018099021 2018-05-23

Publications (1)

Publication Number Publication Date
WO2019225670A1 true WO2019225670A1 (fr) 2019-11-28

Family

ID=68617032

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/020354 Ceased WO2019225670A1 (fr) 2018-05-23 2019-05-22 Procédé de production de corps multicouche

Country Status (1)

Country Link
WO (1) WO2019225670A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024048272A1 (fr) * 2022-08-30 2024-03-07 富士フイルム株式会社 Film anisotrope d'absorption de lumière, procédé de fabrication de film anisotrope d'absorption de lumière, stratifié et dispositif d'affichage d'image

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005520668A (ja) * 2001-07-09 2005-07-14 プラスティック ロジック リミテッド 溶液に影響される整列
JP2005257922A (ja) * 2004-03-10 2005-09-22 Fuji Photo Film Co Ltd 光学補償シート及びその製造方法
JP2007332260A (ja) * 2006-06-14 2007-12-27 Dainippon Printing Co Ltd 液晶組成物、カラーフィルタ及び液晶表示装置
JP2008224968A (ja) * 2007-03-12 2008-09-25 Fujifilm Corp 光学補償フィルムの製造方法及び光学補償フィルム
JP2009025789A (ja) * 2007-06-19 2009-02-05 Fujifilm Corp 光学補償フィルムの製造方法および光学補償フィルム、偏光板、液晶表示装置
JP2009157226A (ja) * 2007-12-27 2009-07-16 Nitto Denko Corp 配向基材並びに傾斜配向位相差フィルムの製造方法
JP2010083950A (ja) * 2008-09-30 2010-04-15 Fujifilm Corp 塗布組成物、光学フィルムの製造方法、光学フィルム、偏光板、及び、ｏｃｂ、ｔｎ、ｖａ、ｉｐｓモードの液晶表示装置
JP2011201300A (ja) * 2010-03-03 2011-10-13 Fujifilm Corp 光散乱シート及びその製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005520668A (ja) * 2001-07-09 2005-07-14 プラスティック ロジック リミテッド 溶液に影響される整列
JP2005257922A (ja) * 2004-03-10 2005-09-22 Fuji Photo Film Co Ltd 光学補償シート及びその製造方法
JP2007332260A (ja) * 2006-06-14 2007-12-27 Dainippon Printing Co Ltd 液晶組成物、カラーフィルタ及び液晶表示装置
JP2008224968A (ja) * 2007-03-12 2008-09-25 Fujifilm Corp 光学補償フィルムの製造方法及び光学補償フィルム
JP2009025789A (ja) * 2007-06-19 2009-02-05 Fujifilm Corp 光学補償フィルムの製造方法および光学補償フィルム、偏光板、液晶表示装置
JP2009157226A (ja) * 2007-12-27 2009-07-16 Nitto Denko Corp 配向基材並びに傾斜配向位相差フィルムの製造方法
JP2010083950A (ja) * 2008-09-30 2010-04-15 Fujifilm Corp 塗布組成物、光学フィルムの製造方法、光学フィルム、偏光板、及び、ｏｃｂ、ｔｎ、ｖａ、ｉｐｓモードの液晶表示装置
JP2011201300A (ja) * 2010-03-03 2011-10-13 Fujifilm Corp 光散乱シート及びその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024048272A1 (fr) * 2022-08-30 2024-03-07 富士フイルム株式会社 Film anisotrope d'absorption de lumière, procédé de fabrication de film anisotrope d'absorption de lumière, stratifié et dispositif d'affichage d'image

Similar Documents

Publication Publication Date Title
CN110168051B (zh) 液晶性组合物、高分子液晶化合物、吸光各向异性膜、层叠体及图像显示装置
JP6932184B2 (ja) 液晶組成物、光吸収異方性膜、積層体および画像表示装置
JP6616489B2 (ja) 着色組成物、光吸収異方性膜、積層体および画像表示装置
JP7291814B2 (ja) 偏光子および画像表示装置
WO2021153510A1 (fr) Composition de cristaux liquides, film anisotrope absorbant la lumière, stratifié, et dispositif d'affichage d'image
US20230035147A1 (en) Optical laminate, viewing angle control system, image display device
JP6976336B2 (ja) 液晶組成物、光吸収異方性膜、積層体および画像表示装置
WO2022202268A1 (fr) Système de commande d'angle de visualisation, dispositif d'affichage d'image, couche optiquement anisotrope et stratifié
WO2019225670A1 (fr) Procédé de production de corps multicouche
US12163083B2 (en) Liquid crystal composition, light absorption anisotropic film, laminate, and image display device
WO2019225517A1 (fr) Procédé de production de produit stratifié
JP7108051B2 (ja) 液晶組成物、高分子液晶性化合物の製造方法、光吸収異方性膜、積層体および画像表示装置
WO2024043149A1 (fr) Film anisotrope d'absorption de lumière, film optique et dispositif d'affichage
JP7169352B2 (ja) 偏光子、および、画像表示装置
JP2023004859A (ja) 光学積層体、視野角制御システム及び画像表示装置
JP7454695B2 (ja) 光配向膜用組成物、光配向膜および光学積層体
WO2020121992A1 (fr) Composition de cristaux liquides, film anisotrope absorbant la lumière, laminé et dispositif d'affichage d'image
CN111656233B (zh) 液晶性组合物、侧链型高分子液晶性化合物、吸光各向异性膜、层叠体及图像显示装置
US20230422616A1 (en) Light absorption anisotropic film, laminate, image display device, and liquid crystal composition
US20230332048A1 (en) Light absorption anisotropic film, optical film, and liquid crystal display device
WO2025143020A1 (fr) Composition de cristaux liquides, film anisotrope absorbant la lumière, stratifié et dispositif d'affichage d'image
WO2024048193A1 (fr) Film anisotrope absorbant la lumière, son procédé de fabrication, stratifié et dispositif d'affichage d'image
JP2023032330A (ja) 長尺フィルム積層体の製造方法、画像表示装置の製造方法、および、長尺フィルム積層体
CN116635466A (zh) 光吸收各向异性膜、层叠体、图像显示装置及液晶组合物
JP2020176270A (ja) 液晶組成物、光吸収異方性膜、積層体および画像表示装置

Legal Events

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

Ref document number: 19808008

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19808008

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP