WO2009101849A1 - 耐水性偏光膜の製造方法 - Google Patents
耐水性偏光膜の製造方法 Download PDFInfo
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- WO2009101849A1 WO2009101849A1 PCT/JP2009/051028 JP2009051028W WO2009101849A1 WO 2009101849 A1 WO2009101849 A1 WO 2009101849A1 JP 2009051028 W JP2009051028 W JP 2009051028W WO 2009101849 A1 WO2009101849 A1 WO 2009101849A1
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- polarizing film
- water
- resistant
- group
- producing
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- 0 C[N+](c1ccc(C(*)=CC(*)C2)c2c1)[N-][C@](CC=C1)c(cc2*)c1cc2N=N* Chemical compound C[N+](c1ccc(C(*)=CC(*)C2)c2c1)[N-][C@](CC=C1)c(cc2*)c1cc2N=N* 0.000 description 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00634—Production of filters
- B29D11/00644—Production of filters polarizing
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B31/00—Disazo and polyazo dyes of the type A->B->C, A->B->C->D, or the like, prepared by diazotising and coupling
- C09B31/02—Disazo dyes
- C09B31/06—Disazo dyes from a coupling component "C" containing a directive hydroxyl group
- C09B31/068—Naphthols
- C09B31/072—Naphthols containing acid groups, e.g. —CO2H, —SO3H, —PO3H2, —OSO3H, —OPO2H2; Salts thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B31/00—Disazo and polyazo dyes of the type A->B->C, A->B->C->D, or the like, prepared by diazotising and coupling
- C09B31/02—Disazo dyes
- C09B31/08—Disazo dyes from a coupling component "C" containing directive hydroxyl and amino groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B63/00—Lakes
- C09B63/005—Metal lakes of dyes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- 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
Definitions
- the present invention relates to a method for producing a water-resistant polarizing film in which an organic dye is oriented.
- a polarizing plate In a liquid crystal panel, a polarizing plate is used to control the optical rotation of light passing through the liquid crystal.
- polarizing plates in which a polymer film such as polyvinyl alcohol is dyed with iodine or a dichroic dye and stretched in one direction are widely used as these polarizing plates.
- the above polarizing plate has a problem that heat resistance and light resistance are not sufficient depending on the type of the dye or the polymer film, and the thickness is considerably thick.
- a method of forming a polarizing film by casting a coating solution containing an organic dye exhibiting lyotropic liquid crystal properties on a substrate such as a glass plate or a polymer film and orienting the organic dye is known.
- Organic dyes exhibiting lyotropic liquid crystal properties form supramolecular aggregates in solution, and when the coating liquid containing them is cast by applying a shear stress, the major axis direction of the supramolecular aggregates becomes the casting direction.
- Patent Document 1 A polarizing film using such an organic dye does not need to be stretched, and since there is no contraction in the width direction due to stretching, it is easy to obtain a polarizing film having a wide width. Moreover, since the film thickness can be remarkably reduced, the future is expected.
- a sulfonate group in which a sulfonate ion (—SO 3 ⁇ ) and a monovalent cation (eg, Li + ) are bonded to a part of the polarizing film in which an organic dye is oriented is imparted with water solubility.
- Organic dyes are used.
- Such a polarizing film has poor water resistance because the sulfonate group of the organic dye is ionized and dissolved in water.
- a water-resistant polarizing film insoluble or hardly soluble in water can be obtained by replacing the monovalent cation of the sulfonate group with a divalent cation insoluble in water and making it water resistant (patent).
- Reference 2 a water-resistant polarizing film insoluble or hardly soluble in water can be obtained by replacing the monovalent cation of the sulfonate group with a divalent cation insoluble in water and making it water resistant (patent).
- JP 2006-323377 A Japanese Patent Laid-Open No. 11-21538
- An object of the present invention is to provide a method for producing a water-resistant polarizing film in which the degree of orientation of an organic dye and the dichroic ratio do not decrease.
- the gist of the present invention is as follows. (1) In the method for producing a water-resistant polarizing film of the present invention, a liquid containing a divalent cation is brought into contact with at least one surface of a polarizing film containing an organic dye having two or more sulfonic acid groups or sulfonate groups. In the method for producing a water-resistant polarizing film including a water-resistant treatment, the organic dye before the water-resistant treatment is an azo compound represented by the following general formula (1) or (2).
- Q 1 and Q 2 represent an aryl group which may have a substituent
- R represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, an acetyl group, a benzoyl group or Represents a phenyl group which may have a substituent
- m represents an integer of 0 to 5
- n represents an integer of 0 to 5 (where m + n ⁇ 5, and at least one of m and n is not 0)
- k represents an integer of 0 to 5
- l represents an integer of 0 to 5 (where k + l ⁇ 5, and at least one of k and l is not 0)
- M represents an element providing a monovalent cation.
- the method for producing a water-resistant polarizing film of the present invention is characterized in that the azo compound is an azo compound represented by the following general formula (3) or (4).
- X represents a hydrogen atom, a halogen atom, a nitro group, a cyano group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or an —SO 3 M group.
- R represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, an acetyl group, a benzoyl group, or an optionally substituted phenyl group
- M represents an element that provides a monovalent cation.
- the method for producing a water-resistant polarizing film of the present invention is characterized in that the ionic radius of the divalent cation is 0.05 nm to 0.2 nm.
- the method for producing a water-resistant polarizing film of the present invention is characterized in that the concentration of the ionic compound providing the divalent cation in the liquid containing the divalent cation is 1% to 40%.
- the method for producing a water-resistant polarizing film of the present invention is characterized in that the liquid temperature of the liquid containing a divalent cation is 5 ° C. to 60 ° C.
- the method for producing a water-resistant polarizing film of the present invention is characterized in that the liquid containing the divalent cation is an aqueous barium chloride solution.
- the water-resistant polarizing film is less likely to have a low dichroic ratio even when water-resistant treatment is performed. Can get.
- the inventors of the present invention have found that in order to obtain a water-resistant polarizing film in which the dichroic ratio is unlikely to decrease, adjacent sulfones in an organic dye used for a polarizing film subjected to water resistance treatment. It was found that the positional relationship between acid groups or sulfonate groups is important.
- An azo compound that has been conventionally used as an organic dye is, for example, an azo compound represented by the following structural formula (5).
- the azo compound 10 shown in the structural formula (5) is close to the position of the adjacent sulfonate ion 11, and therefore, the monovalent cation 12 having a small ionic radius is changed to the ionic radius of the ionic compound.
- the azo compound 10 was bent or twisted to lose linearity, and the dichroic ratio of the obtained water-resistant polarizing film was lowered.
- the azo compound used in the present invention is, for example, an azo compound represented by the following structural formula (6).
- the azo compound 20 shown in the structural formula (6) has a monovalent cation 22 having a small ionic radius because the positions of adjacent sulfonate ions 21 are appropriately separated.
- the linearity of the azo compound 20 is maintained even after ion exchange with the divalent cation 23 having a large ionic radius. As a result, it is possible to prevent the dichroic ratio of the water-resistant polarizing film from being lowered by the water resistance treatment.
- the method for producing a water-resistant polarizing film of the present invention is made water resistant by bringing a liquid containing a divalent cation into contact with at least one surface of a polarizing film containing an organic dye having two or more sulfonic acid groups or sulfonate groups.
- dye before the water resistance process including the process to process is a specific azo compound, It is characterized by the above-mentioned.
- the absolute value of the change rate of the dichroic ratio of the polarizing film due to the water resistance treatment can be preferably 15% or less, more preferably 10% or less.
- the method for producing a water-resistant polarizing film of the present invention is not particularly limited as long as the above characteristics are satisfied, and may include an optional step.
- the method for producing a water-resistant polarizing film of the present invention comprises a step of bringing a liquid containing a divalent cation into contact with at least one surface of the polarizing film, and then washing the adhered liquid with water or drying it. May be included.
- the polarizing film before the water resistance treatment contains an organic dye composed of an azo compound represented by the following general formula (1) or (2).
- Q 1 and Q 2 represent an aryl group which may have a substituent.
- R represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, an acetyl group, a benzoyl group, or an optionally substituted phenyl group.
- m represents an integer of 0 to 5
- n represents an integer of 0 to 5 (where m + n ⁇ 5, and at least one of m and n is not 0).
- M represents an element providing a monovalent cation, and is preferably a hydrogen atom or an alkali metal atom.
- the polarizing film before the water resistance treatment contains the azo compound represented by the general formula (1) or (2), preferably 50% by weight to 100% by weight of the total weight of the polarizing film.
- the positions of the adjacent sulfonate ions are appropriately separated, so that the monovalent cation (M) has a large ionic radius.
- the linearity of the azo compound is maintained even after ion exchange with a valent cation. For this reason, the orientation degree and dichroic ratio of the water-resistant polarizing film are maintained before and after the water resistance treatment.
- the substitution position of the hydroxyl group (—OH) and the amino group (—NHR) is not particularly limited, and may be substituted at an arbitrary position of the naphthalene skeleton.
- the polarizing film before water resistance treatment contains an organic dye composed of an azo compound represented by the following general formula (3) or (4).
- R and M are the same as those in the general formulas (1) and (2), and X is a hydrogen atom, a halogen atom, a nitro group, a cyano group, or an alkyl having 1 to 4 carbon atoms. Group, an alkoxy group having 1 to 4 carbon atoms or a —SO 3 M group.
- An organic dye composed of an azo compound represented by the general formula (3) or (4) exhibits stable liquid crystallinity, and a polarizing film having a high dichroic ratio can be obtained.
- Examples of the azo compounds represented by the general formulas (1) to (4) include diazotization and cupping of an aromatic compound having an amino acid (eg, aniline derivative, aminonaphthalene derivative) and a naphthalenesulfonic acid derivative by a conventional method. It can be obtained by ring reaction to obtain a monoazo compound, further diazotization, and coupling reaction with an aminonaphtholsulfonic acid derivative.
- an amino acid eg, aniline derivative, aminonaphthalene derivative
- a naphthalenesulfonic acid derivative by a conventional method. It can be obtained by ring reaction to obtain a monoazo compound, further diazotization, and coupling reaction with an aminonaphtholsulfonic acid derivative.
- naphthalenesulfonic acid derivative examples include 8-amino-2-naphthalenesulfonic acid, 5-amino-1-naphthol-3-sulfonic acid hydrate, and the like.
- amino naphthol sulfonic acid derivatives examples include 1-amino-8-naphthol-2,4-disulfonate, 7-amino-1,3-naphthalenedisulfonate, 2-naphthol-6,8-disulfonate.
- the polarizing film before water resistance treatment may contain other organic dyes in addition to the azo compounds represented by the general formulas (1) to (4).
- Other organic dyes are, for example, azo compounds, anthraquinone compounds, perylene compounds, quinophthalone compounds, naphthoquine compounds, merocyanine compounds, and the like. These organic dyes are also preferably those having two or more sulfonic acid groups or sulfonic acid groups.
- the polarizing film before the water resistance treatment is typically obtained by casting and drying a coating solution containing the azo compound represented by the above general formulas (1) to (4) and a solvent.
- the azo compound can be oriented by flow when a shear stress is applied in a liquid crystal state.
- the azo compound forms supramolecular aggregates in the coating liquid, and when the coating liquid containing the azo compound is flowed by applying a shear stress, the major axis direction of the supramolecular aggregates is aligned in the flow direction.
- the orientation means may combine orientation treatment such as rubbing treatment or photo-alignment, or orientation by a magnetic field or electric field.
- the solvent used in the present invention is not particularly limited, but a hydrophilic solvent is preferably used.
- the hydrophilic solvent is preferably water, alcohols, cellosolves or a mixed solvent thereof.
- a water-soluble compound such as glycerin or ethylene glycol may be added to the solvent. These additives can be used to adjust the solubility of the azo compound and the drying speed of the liquid crystalline coating solution.
- the water-resistant treatment used in the method for producing a water-resistant polarizing film of the present invention includes divalent cations on at least one surface of a polarizing film containing an organic dye having two or more sulfonic acid groups or sulfonate groups. It is the process which contacts the liquid which contains.
- the divalent cation is not particularly limited, and examples thereof include alkaline earth metal ions and metal ions.
- metal ions include Ba 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Pd 2+ , Cd 2+ , Sn 2+ , Co 2+ , and Mn 2+ .
- the divalent cation may be used alone or in combination of two or more.
- the ionic radius of the divalent cation is preferably 0.05 nm to 0.2 nm, more preferably 0.1 nm to 0.18 nm. If the ionic radius is too large, the linearity of the azo compound may be lost and the dichroic ratio may be reduced. If the ionic radius is too small, ion exchange is not performed and water resistance may not be obtained.
- an aqueous solution of chloride eg, an aqueous barium chloride solution or an aqueous lead chloride solution
- aqueous barium chloride solution e.g., an aqueous barium chloride solution or an aqueous lead chloride solution
- the concentration of the ionic compound providing the divalent cation in the liquid containing the divalent cation is preferably 1% to 40%, more preferably 5% to 40%. If the concentration is too high, handling may be difficult, and if it is too low, the effect of water resistance may not be sufficiently obtained.
- the liquid temperature of the liquid containing the divalent cation is preferably 5 ° C. to 60 ° C., more preferably 10 ° C. to 40 ° C. If the liquid temperature is too high or too low, the water-resistant polarizing film after the water-resistant treatment may be cracked or the water-resistant polarizing film may become white and cloudy.
- the liquid containing the divalent cation is preferably an aqueous barium chloride solution. Since the aqueous barium chloride solution is neutral, there is no fear of corroding the coating coater, and it is easily available industrially.
- the means for bringing the liquid containing the divalent cation into contact with at least one surface of the polarizing film is not particularly limited.
- the polarizing film may be immersed in the liquid containing the divalent cation, A liquid containing a divalent cation may be applied to the surface of the polarizing film.
- the water-resistant polarizing film in the present invention can be obtained by subjecting a polarizing film containing an organic dye composed of an azo compound represented by the general formulas (1) to (4) to the above-mentioned water resistance treatment.
- the water-resistant polarizing film is not particularly limited as long as it includes a compound in which the monovalent cation (M) is substituted with a divalent cation in the general formulas (1) to (4).
- a part of the above monovalent cation (M) may be contained without being substituted, but remaining as the monovalent cation (M).
- the residual amount of monovalent cations (M) is preferably 20 or less per 100 divalent cations.
- the water-resistant polarizing film in the present invention exhibits absorption dichroism in at least one wavelength in the visible light region (wavelength 380 nm to 780 nm).
- the thickness of the water-resistant polarizing film in the present invention is preferably 0.1 ⁇ m to 3 ⁇ m, and the dichroic ratio is preferably 11 or more.
- the water-resistant polarizing film in the present invention is suitably used as a polarizing element.
- Polarizing elements are various liquid crystal panels, such as computers, copiers, mobile phones, watches, digital cameras, personal digital assistants, portable game machines, video cameras, TVs, microwave ovens, car navigation systems, car audio systems, monitor monitors, and monitors. Used in LCD panels for monitors and medical monitors.
- the water-resistant polarizing film in the present invention may be used after being peeled off from the substrate, or may be used while being laminated with the substrate. When used for optical purposes while being laminated with a substrate, the substrate is preferably transparent to visible light. When peeled from the base material, it is preferably used by being laminated on another support or optical element.
- Example 1 4-azoaniline and 8-amino-2-naphthalenesulfonic acid are diazotized by the conventional method (Toyo Hosoda, “Theoretical Manufacturing, Dye Chemistry, 5th Edition”, published on July 15, 1968, Technique Hall, pages 135-152). And a coupling reaction to obtain a monoazo compound.
- the obtained monoazo compound was similarly diazotized by a conventional method, and further subjected to a coupling reaction with 1-amino-8-naphthol-2,4-disulfonic acid lithium salt to obtain a crude compound containing an azo compound of the following structural formula (6).
- a product was obtained and salted out with lithium chloride to obtain an azo compound of the following structural formula (6).
- the azo compound of the above structural formula (6) was dissolved in ion exchange water to prepare a coating solution having an azo compound concentration of 20% by weight.
- the coating solution was collected with a poly dropper, and sandwiched between two slide glasses. When observed with a polarizing microscope at room temperature (23 ° C.), a nematic liquid crystal phase was observed.
- This coating solution is flowed in a thin film using a bar coater (trade name “Mayerrot HS4” manufactured by BUSCHMAN) on the surface of a norbornene polymer film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.) subjected to rubbing treatment and corona treatment. Then, it was naturally dried in a constant temperature room at 23 ° C. to prepare a laminate of a polarizing film and a norbornene polymer film. The thickness of the polarizing film was 0.4 ⁇ m.
- the surface of the polarizing film was subjected to water resistance treatment by washing with water.
- the water-resistant polarizing film thus obtained did not dissolve even when washed with water.
- Table 1 shows the optical characteristics of the laminate having the water-resistant polarizing film. Since the norbornene polymer film of the base material is optically isotropic, the optical characteristics of the laminate are almost equal to the optical characteristics of the water-resistant polarizing film.
- Example 2 A compound of the following structural formula (7) was obtained in the same manner as in Example 1 except that 4-nitroaniline was changed to p-anisidine.
- the azo compound of the structural formula (7) was dissolved in ion exchange water to prepare a coating solution having an azo compound concentration of 20% by weight.
- the coating solution was collected with a poly dropper, and sandwiched between two slide glasses. When observed with a polarizing microscope at room temperature (23 ° C.), a nematic liquid crystal phase was observed.
- Example 1 Using the above coating liquid, a laminate having a polarizing film and a water-resistant polarizing film was obtained in the same manner as in Example 1. Table 1 shows the optical characteristics of the laminate having the obtained water-resistant polarizing film.
- Example 3 A compound of the following structural formula (8) was obtained in the same manner as in Example 1 except that 4-nitroaniline was changed to p-toluidine.
- the azo compound of the structural formula (8) was dissolved in ion-exchanged water to prepare a coating solution having an azo compound concentration of 20% by weight.
- the coating solution was collected with a poly dropper, and sandwiched between two slide glasses. When observed with a polarizing microscope at room temperature (23 ° C.), a nematic liquid crystal phase was observed.
- Example 1 Using the above coating liquid, a laminate having a polarizing film and a water-resistant polarizing film was obtained in the same manner as in Example 1. Table 1 shows the optical characteristics of the laminate having the obtained water-resistant polarizing film.
- Example 4 A compound of the following structural formula (9) was obtained in the same manner as in Example 1 except that 8-amino-2-naphthalenesulfonic acid was changed to 5-amino-1-naphthol-3-sulfonic acid hydrate. .
- the azo compound of the above structural formula (9) was dissolved in ion exchange water to prepare a coating solution having an azo compound concentration of 20% by weight.
- the coating solution was collected with a poly dropper, and sandwiched between two slide glasses. When observed with a polarizing microscope at room temperature (23 ° C.), a nematic liquid crystal phase was observed.
- Example 1 Using the above coating liquid, a laminate having a polarizing film and a water-resistant polarizing film was obtained in the same manner as in Example 1. Table 1 shows the optical characteristics of the laminate having the obtained water-resistant polarizing film.
- the azo compound represented by the structural formula (5) was dissolved in ion-exchanged water to prepare a coating solution having an azo compound concentration of 20% by weight.
- the coating solution was collected with a poly dropper, and sandwiched between two slide glasses. When observed with a polarizing microscope at room temperature (23 ° C.), a nematic liquid crystal phase was observed.
- Example 1 Using the above coating liquid, a laminate having a polarizing film and a water-resistant polarizing film was obtained in the same manner as in Example 1. Table 1 shows the optical characteristics of the laminate having the obtained water-resistant polarizing film.
- the azo compound having the structural formula (10) was dissolved in ion exchange water to prepare a coating solution having an azo compound concentration of 20% by weight.
- the pH of this coating solution was 6.0.
- the coating solution was collected with a poly dropper, and sandwiched between two slide glasses. When observed with a polarizing microscope at room temperature (23 ° C.), a nematic liquid crystal phase was observed.
- Example 1 Using the above coating liquid, a laminate having a polarizing film and a water-resistant polarizing film was obtained in the same manner as in Example 1. Table 1 shows the optical characteristics of the laminate having the obtained water-resistant polarizing film.
- the azo compound represented by the structural formula (11) was dissolved in ion exchange water to prepare a coating solution having an azo compound concentration of 20% by weight.
- the pH of this coating solution was 6.0.
- the coating solution was collected with a poly dropper, and sandwiched between two slide glasses. When observed with a polarizing microscope at room temperature (23 ° C.), a nematic liquid crystal phase was observed.
- Example 1 Using the above coating liquid, a laminate having a polarizing film and a water-resistant polarizing film was obtained in the same manner as in Example 1. Table 1 shows the optical characteristics of the laminate having the obtained water-resistant polarizing film.
- Example 1 When Example 1 (Formula 6), Example 2 (Formula 7), and Example 3 (Formula 8) are compared, the change rate of the dichroic ratio is very high for CH 3 O— (Example 2). Smaller, —NO 2 (Example 1) is next, and CH 3 — (Example 3) is slightly larger. However, the absolute value of the dichroic ratio is large for CH 3 ⁇ (Example 3), and slightly smaller for CH 3 O— (Example 2) and —NO 2 (Example 1). (5) When Example 1 (Equation 6) and Example 4 (Equation 9) are compared, the change rate of the dichroic ratio is very small.
- the absolute values of the dichroic ratio are both small.
- the change rate of the dichroic ratio is slightly larger in CH 3- (Example 3), but is smaller in -NO 2 (Examples 1 and 4) and CH 3 O- (Example 2).
- the absolute value of the dichroic ratio is large for CH 3 — (Example 3, Comparative Example 3), and —NO 2 (Example 1, Example 4, Comparative Example 1) and CH 3 O— (Example). 2, Comparative Example 2) is slightly smaller.
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Abstract
Description
(1)本発明の耐水性偏光膜の製造方法は、スルホン酸基またはスルホン酸塩基を2つ以上有する有機色素を含む偏光膜の少なくとも一方の表面に、2価陽イオンを含む液体を接触させて耐水化処理する工程を含む耐水性偏光膜の製造方法において、前記耐水化処理前の前記有機色素が下記一般式(1)または(2)で表わされるアゾ化合物であることを特徴とする。
(2)本発明の耐水性偏光膜の製造方法は、前記アゾ化合物が下記一般式(3)または(4)で表わされるアゾ化合物であることを特徴とする。
(3)本発明の耐水性偏光膜の製造方法は、前記2価陽イオンのイオン半径が0.05nm~0.2nmであることを特徴とする。
(4)本発明の耐水性偏光膜の製造方法は、前記2価陽イオンを含む液体における、前記2価陽イオンを供するイオン化合物の濃度が1%~40%であることを特徴とする。
(5)本発明の耐水性偏光膜の製造方法は、前記2価陽イオンを含む液体の液温が5℃~60℃であることを特徴とする。
(6)本発明の耐水性偏光膜の製造方法は、前記2価陽イオンを含む液体が塩化バリウム水溶液であることを特徴とする。
本発明の耐水性偏光膜の製造方法は、スルホン酸基またはスルホン酸塩基を2つ以上有する有機色素を含む偏光膜の少なくとも一方の表面に、2価陽イオンを含む液体を接触させて耐水化処理する工程を含み、耐水化処理前の有機色素が特定のアゾ化合物であることを特徴とする。この製造方法によれば、耐水化処理による偏光膜の二色比の変化率の絶対値を、好ましくは15%以下、より好ましくは10%以下にすることができる。本発明の耐水性偏光膜の製造方法は、上記の特徴を満足するものであれば特に制限はなく、任意の工程を含んでいてもよい。例えば、本発明の耐水性偏光膜の製造方法は、偏光膜の少なくとも一方の表面に、2価陽イオンを含む液体を接触させた後、付着した液体を水洗する工程や、乾燥する工程などを含んでいてもよい。
本発明の耐水性偏光膜の製造方法において、耐水化処理前の偏光膜は下記一般式(1)または(2)で表わされるアゾ化合物からなる有機色素を含むことを特徴とする。式(1)および(2)中、Q1およびQ2は置換基を有していてもよいアリール基を表わす。Rは水素原子、炭素数1~3のアルキル基、アセチル基、ベンゾイル基または置換基を有していてもよいフェニル基を表わす。mは0~5の整数、nは0~5の整数を表わす(ただしm+n≦5で、m、nの少なくとも一つは0でない)。kは0~5の整数、lは0~5の整数を表わす(ただしk+l≦5で、k、lの少なくとも一つは0でない)。Mは1価の陽イオンを供する元素を表わし、好ましくは水素原子またはアルカリ金属原子である。
本発明の耐水性偏光膜の製造方法において用いられる耐水化処理は、上記のスルホン酸基またはスルホン酸塩基を2つ以上有する有機色素を含む偏光膜の、少なくとも一方の表面に2価陽イオンを含む液体を接触させる処理である。
本発明における耐水性偏光膜は、上記の一般式(1)~(4)で表わされるアゾ化合物からなる有機色素を含む偏光膜を、上述の耐水化処理することによって得られる。上記の耐水性偏光膜は上記の一般式(1)~(4)中、1価の陽イオン(M)が2価の陽イオンで置換されたものを含むものであれば特に制限はない。例えば、上記の1価の陽イオン(M)の一部が置換されずに1価の陽イオン(M)のままであるものを含んでいてもよい。この場合、1価の陽イオン(M)の残存量は、2価の陽イオン100個に対して20個以下であることが好ましい。
本発明における耐水性偏光膜は、偏光素子として好適に用いられる。偏光素子は各種の液晶パネル、例えばコンピュータ、コピー機、携帯電話、時計、デジタルカメラ、携帯情報端末、携帯ゲーム機、ビデオカメラ、テレビ、電子レンジ、カーナビゲーション、カーオーディオ、店舗用モニター、監視用モニター、医療用モニターなどの液晶パネルに使われる。本発明における耐水性偏光膜は基材から剥離して用いてもよいし、基材と積層したまま用いてもよい。基材と積層したまま光学用途に用いる場合、基材は可視光に透明なものが好ましい。基材から剥離した場合は、好ましくは他の支持体や光学素子に積層して用いられる。
4-ニトロアニリンと8-アミノ-2-ナフタレンスルホン酸とを常法(細田豊著「理論製造 染料化学 第5版」昭和43年7月15日技法堂発行、135ページ~152ページ)によりジアゾ化およびカップリング反応させてモノアゾ化合物を得た。得られたモノアゾ化合物を同様に常法によりジアゾ化し、さらに1-アミノ-8-ナフトール-2,4-ジスルホン酸リチウム塩とカップリング反応させて下記の構造式(6)のアゾ化合物を含む粗生成物を得、これを塩化リチウムで塩析することにより下記の構造式(6)のアゾ化合物を得た。
4-ニトロアニリンをp-アニシジンに変えた以外は、実施例1と同様の方法で下記構造式(7)の化合物を得た。
4-ニトロアニリンをp-トルイジンに変えた以外は、実施例1と同様の方法で下記構造式(8)の化合物を得た。
8-アミノ-2-ナフタレンスルホン酸を5-アミノ-1-ナフトール-3-スルホン酸水和物に変えた以外は、実施例1と同様の方法で下記構造式(9)の化合物を得た。
1-アミノ-8-ナフトール-2,4-ジスルホン酸リチウム塩に代えて、7-アミノ-1-ナフトール-3,6-ジスルホン酸リチウム塩を用いた以外は実施例1と同様の方法で、下記構造式(5)のアゾ化合物を得た。
(1)実施例1(式6)と比較例1(式5)を比較すると、-SO3Liの位置の違いにより、二色比の変化率が大きく異なる。しかし変化前の二色比の差は比較的少ない。
(2)実施例2(式7)と比較例2(式10)を比較すると、-SO3Liの位置の違いにより、二色比の変化率が大きく異なる。しかし変化前の二色比の差は比較的少ない。
(3)実施例3(式8)と比較例3(式11)を比較すると、-SO3Liの位置の違いにより、二色比の変化率が大きく異なる。しかし変化前の二色比の差は比較的少ない。
(4)実施例1(式6)、実施例2(式7)、実施例3(式8)を比較すると、二色比の変化率は、CH3O-(実施例2)が非常に小さく、-NO2(実施例1)がそれに次ぎ、CH3-(実施例3)はやや大きい。しかし二色比の絶対値はCH3-(実施例3)が大きく、CH3O-(実施例2)と-NO2(実施例1)はやや小さい。
(5)実施例1(式6)と実施例4(式9)を比較すると、二色比の変化率はどちらも非常に小さい。しかし二色比の絶対値はどちらも小さめである。
(6)二色比の変化率は、CH3-(実施例3)がやや大きいが、-NO2(実施例1、実施例4)とCH3O-(実施例2)は小さい。
(7)二色比の絶対値は、CH3-(実施例3、比較例3)が大きく、-NO2(実施例1、実施例4、比較例1)とCH3O-(実施例2、比較例2)はやや小さい。
[液晶相の観察]
コーティング液を少量ポリスポイトで採取し、二枚のスライドガラス(松浪ガラス社製 商品名「MATSUNAMI SLIDE GLASS」)に挟み偏光顕微鏡(オリンパス社製 商品名「OPTIPHOT-POL」)を用いて室温(23℃)で観察した。
偏光膜の一部を剥離し、三次元非接触表面形状計測システム(菱化システム社製 製品名「Micromap MM5200」)を用いて段差を測定し、厚みを求めた。
グラントムソン偏光子を備えた分光光度計(日本分光社製 商品名「V-7100」)を用いて測定した値により下式により算出した。
二色比={-log(1-P/100)×Ys/100}/{-log(1+P/100)×Ys/100}
P={(Yp-Yc)/(Yp+Yc)}1/2×100
ここで、Ysは単体透過率、Ypは平行透過率、Ycは直交透過率である。
11 スルホン酸イオン
12 1価の陽イオン
13 2価の陽イオン
20 本発明に用いられるアゾ化合物
21 スルホン酸イオン
22 1価の陽イオン
23 2価の陽イオン
Claims (6)
- スルホン酸基またはスルホン酸塩基を2つ以上有する有機色素を含む偏光膜の少なくとも一方の表面に、2価陽イオンを含む液体を接触させて耐水化処理する工程を含む耐水性偏光膜の製造方法において、前記耐水化処理前の前記有機色素が下記一般式(1)または(2)で表わされるアゾ化合物であることを特徴とする耐水性偏光膜の製造方法。
- 前記2価陽イオンのイオン半径が0.05nm~0.2nmであることを特徴とする請求項1または2に記載の耐水性偏光膜の製造方法。
- 前記2価陽イオンを含む液体における、前記2価陽イオンを供するイオン化合物の濃度が1%~40%であることを特徴とする請求項1または2に記載の耐水性偏光膜の製造方法。
- 前記2価陽イオンを含む液体の液温が5℃~60℃であることを特徴とする請求項1または2に記載の耐水性偏光膜の製造方法。
- 前記2価陽イオンを含む液体が塩化バリウム水溶液であることを特徴とする請求項1または2に記載の耐水性偏光膜の製造方法。
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CN2009801010169A CN101861536B (zh) | 2008-02-13 | 2009-01-23 | 耐水性偏光膜的制造方法 |
US12/866,596 US8491823B2 (en) | 2008-02-13 | 2009-01-23 | Process for producing water-resistant polarizing film |
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Cited By (5)
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JP2012058427A (ja) * | 2010-09-08 | 2012-03-22 | Nitto Denko Corp | 耐水化された光学異方性フィルムの製造方法、及び画像表示装置 |
JP2013156665A (ja) * | 2008-06-20 | 2013-08-15 | Nitto Denko Corp | 耐水性偏光膜の製造方法 |
WO2015115296A1 (ja) * | 2014-01-30 | 2015-08-06 | 日東電工株式会社 | 偏光板及び偏光板の製造方法 |
US9387507B2 (en) | 2011-12-07 | 2016-07-12 | Nitto Denko Corporation | Method for manufacturing water resistant optically anisotropic film, and water resistant optically anisotropic film |
JP2020003823A (ja) * | 2014-01-30 | 2020-01-09 | 日東電工株式会社 | 偏光板及び偏光板の製造方法 |
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JP5695298B2 (ja) * | 2009-02-05 | 2015-04-01 | 日東電工株式会社 | 液晶性コーティング液および偏光膜 |
JP2010197760A (ja) * | 2009-02-26 | 2010-09-09 | Nitto Denko Corp | 耐水性偏光膜の製造方法 |
US9079289B2 (en) * | 2011-09-22 | 2015-07-14 | Toyo Tire & Rubber Co., Ltd. | Polishing pad |
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KR20100068439A (ko) | 2010-06-23 |
US20130277871A1 (en) | 2013-10-24 |
US8491823B2 (en) | 2013-07-23 |
KR101169235B1 (ko) | 2012-08-02 |
TWI407160B (zh) | 2013-09-01 |
CN101861536B (zh) | 2011-11-09 |
US20100314784A1 (en) | 2010-12-16 |
JP5153436B2 (ja) | 2013-02-27 |
CN101861536A (zh) | 2010-10-13 |
JP2009217230A (ja) | 2009-09-24 |
TW200949318A (en) | 2009-12-01 |
US8741190B2 (en) | 2014-06-03 |
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