US20090269591A1 - Organic Compound, Optical Film and Method of Production thereof - Google Patents

Organic Compound, Optical Film and Method of Production thereof Download PDF

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US20090269591A1
US20090269591A1 US12/426,326 US42632609A US2009269591A1 US 20090269591 A1 US20090269591 A1 US 20090269591A1 US 42632609 A US42632609 A US 42632609A US 2009269591 A1 US2009269591 A1 US 2009269591A1
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organic compound
groups
list
rod
macromolecule
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Irina Kasianova
Darya Yurchenko
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Crysoptix KK
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Crysoptix KK
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Priority to US12/426,326 priority Critical patent/US20090269591A1/en
Assigned to CRYSOPTIX KK reassignment CRYSOPTIX KK ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KASIANOVA, IRINA, YURCHENKO, DARYA
Priority to ES09734122T priority patent/ES2389600T3/es
Priority to JP2011505632A priority patent/JP5599780B2/ja
Priority to PCT/IB2009/051659 priority patent/WO2009130675A1/en
Priority to EP20090734122 priority patent/EP2279233B1/en
Publication of US20090269591A1 publication Critical patent/US20090269591A1/en
Priority to US14/109,850 priority patent/US9212296B2/en
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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
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D177/00—Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D177/06—Polyamides derived from polyamines and polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C09K19/3804—Polymers with mesogenic groups in the main chain
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C09K19/3804—Polymers with mesogenic groups in the main chain
    • C09K19/3809—Polyesters; Polyester derivatives, e.g. polyamides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K2019/0444—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31623—Next to polyamide or polyimide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31725—Of polyamide

Definitions

  • the present invention relates generally to the field of organic chemistry and particularly to the organic films with phase-retarding properties for displays. More specifically, the present invention is related to the conjugated organic compounds capable of forming a rod-like macromolecule and manufacture of the optical films based on these compounds.
  • Liquid crystals are widely used in electronic optical displays.
  • a liquid crystal cell is typically situated between a pair of crossed polarizing plates.
  • light from the backlight source is polarized by a first polarizer and transmitted through a liquid crystal cell, where its polarization state is affected according to the molecular orientation of the liquid crystal that can be controlled by applying a voltage across the cell. Then, light having altered polarization state is transmitted through a second polarizer.
  • the transmission of light from backlight source can be controlled and the grayscale can be obtained.
  • the energy required to provide for this control is generally much lower than that required for controlling the emission from luminescent materials used in other types of display such as cathode ray tubes (CRTs).
  • liquid crystal technology is used in a number of electronic imaging devices, including (but not limited to) digital watches, calculators, portable computers, and electronic games, for which small weight, low power consumption, and long working life are important.
  • the contrast, color reproduction (color rendering), and stable gray scale intensity gradation are important quality characteristics of electronic displays that employ liquid crystal technology.
  • the primary factor determining the contrast of a liquid crystal display (LCD) is the quantity of light transmitted by the display, which is in the dark or “black” pixel state.
  • this light leakage and, hence, the contrast of an LCD also depend on the direction from which the display screen is viewed. Viewing direction is defined as a set of polar viewing angle ⁇ and azimuthal viewing angle ⁇ .
  • the polar viewing angle ⁇ is measured from display normal direction and the azimuthal viewing angle ⁇ is measured in the plane of the display with respect to an appropriate reference direction.
  • the optimum contrast is observed only within a narrow viewing angle range centered about the normal to the display and falls off rapidly as the polar viewing angle ⁇ is increased.
  • Various display image properties such as contrast ratio, color reproduction, and image brightness are the functions of the angles ⁇ and ⁇ .
  • the leakage problem not only decreases the contrast but also causes color or hue shifts with the resulting degradation of color reproduction.
  • LCDs are replacing CRTs as monitors for television (TV) sets, computers (such as, for example, notebook computers or desktop computers), central control units, and various devices, for example, gambling machines, electro-optical displays, (such as displays of watches, pocket calculators, electronic pocket games), and portable data banks (such as personal digital assistants or of mobile telephones). It is also expected that the number of LCD television monitors with a larger screen size will sharply increase in the near future. However, unless problems related to the effect of viewing angle on the coloration, contrast degradation and inversion are solved, the replacement of traditional CRTs by LCDs will be limited.
  • the technological progress poses the task of developing optical elements based on new materials with desired controllable properties.
  • the necessary optical element in modern visual display systems is an optically anisotropic film that is optimised for the optical characteristics of an individual display module.
  • Synthetic rigid rod polyelectrolytes are used as model objects structurally close to natural rigid-rod polymers such as deoxyribonucleic acid (DNA), proteins, polysaccharides, which are highly capable of forming well-ordered structures by spontaneous self-assembly, which is fundamental to invoke their biological functions. Since the natural rigid-rod polyelectrolytes are difficult to extract without denaturation, synthetic analogues can be studied to investigate some aspects of self-assembling properties in aqueous solutions. Shear-induced mesophase organization of synthetic polyelectrolytes in aqueous solution was described by Takafumi Funaki, Tatsuo Kaneko et al. in Langmuir, 2004, val. 20, pp. 6518-6520.
  • PBDT poly(2,2′-disulfonylbenzidine terephtalamide)
  • Rigid rod, water-soluble polymers are described by N. Sarkar and D. Kershner in Journal of Applied Polymer Science, Vol. 62, pp. 393-408 (1996). The authors of this paper pointed out that these polymers are used for many applications such as enhanced oil recovery. For these applications, it is essential to have an extremely water soluble shear stable polymer that can impart high viscosity at very low concentration for economic reasons. It is known that rigid rod polymers can deliver high viscosity at low molecular weight compared with the traditionally used flexible chain polymers such as a hydrolyzed poly-acrylamides. Polymers with helical or double stranded conformations may be considered as truly rigid rod in solution.
  • New sulfonated water soluble aromatic polyamides, polyureas, and polyimides were prepared via interfacial or solution polymerization of sulfonated aromatic diamines with aromatic dianhydrides, diacid chlorides, or phosgene. Some of these polymers had sufficiently high molecular weight ( ⁇ 200,000), extremely high intrinsic viscosity ( ⁇ 65 dL/g), and appeared to transform into a helical coil in salt solution. These polymers have been evaluated in applications such as thickening of aqueous solutions, flocculation and dispersion stabilization of particulate materials, and membrane separation utilizing cast films.
  • poly[N,N′-(sulfo-p-phenylene)terephthalamide] PPT-S
  • DMAC dimethylacetamide
  • the isolated polymer requires heating in water to dissolve; the resulting cooled solutions are viscous or gels at concentrations as low as 0.4%. They are highly birefringent, exhibit circular dichroism properties, and are viscosity-sensitive to salt. Solutions of this polymer mixed with those of guar or hydroxyethyl cellulose give significantly enhanced viscosity.
  • the polymer is relatively low molecular weight, ca. 5000 estimated from viscosity data.
  • Some meta and para isomeric analogs of PPT-S were prepared; these polymers have similar properties except they are more soluble in water, and higher concentrations are required to obtain significant viscosity.
  • Poly[N,N′-(sulfo-p-phenylene)pyromellitimide] (PIM-S) was prepared similarly from 2,5-diaminobenzenesulfonic acid and pyromellitic dianhydride. Its aqueous solution properties are similar to those of PPT-S. It appears that these relatively low-molecular-weight rigid-chain polymers associate in water to form a network that results in viscous solutions at low concentrations.
  • an optical device includes a transparent molecularly oriented highly birefringent polymer.
  • Said highly birefringent polymer comprises repeating molecular units exhibiting high electron density substantially cylindrically distributed about the long axes of the polymer and the repeating units thereof.
  • the highly birefringent polymer is substantially optically uniaxial exhibiting only two indices of refraction.
  • the molecularly oriented highly birefringent polymer comprises recurring units of the formula:
  • R and R 1 are each hydrogen, alkyl, aryl, alkaryl or aralkyl, and A is a divalent radical selected from the group consisting of
  • each W is hydrogen or a substituent other than hydrogen
  • p is an integer from 1 to 3
  • each X is hydrogen or a substituent other than hydrogen
  • r is an integer from 1 to 4, said U, Wp and Xr substitution being sufficient to provide the radical with a non-coplanar molecular configuration
  • each of Y and Z is hydrogen or a substituent other than hydrogen and each t is an integer from 1 to 4, with the proviso that when each Z is hydrogen, at least one Y substituent is a substituent other than hydrogen positioned on the corresponding nucleus ortho with respect to the
  • the moiety of the radical, Z and Yt substitution are sufficient to provide the radical with a non-coplanar molecular configuration.
  • a preferred reaction sequence where a mixture of copolymerizable monomers is utilized involves the preparation of a solution of a first monomer in the amide or urea solvent and the addition thereto of a second or other monomer or a solution thereof in a suitable organic solvent, such as tetrahydrofuran. External cooling of the resulting reaction mixture provides the desired polyamide material in high molecular weight and minimizes the production of undesired side reactions or by-products.
  • the polyamide materials prepared as described can be recovered by combining the polymerization reaction mixture with a non-solvent for the polymer and separating the polymer, as by filtration. This can be effectively accomplished by blending the polymerization mixture with water and filtering the solid polyamide material.
  • the polyamide can be washed with an organic solvent such as acetone or ether and dried, for example, in a vacuum oven.
  • the polymeric materials utilized in the devices according to these references can be formed or shaped into various films, sheets, coatings, layers, fibrils, fibers or the like.
  • a solution of a substituted polyamide as described hereinbefore, in a solvent material such as N,N-dimethylacetamide, optionally containing lithium chloride solubilizing agent can be readily cast onto a suitable support material for the formation of a polymeric film or layer of the polyamide material.
  • the polymeric film can be utilized for the production of a birefringent polymeric film or sheet material which can be utilized in an optical device of the invention.
  • a polymeric film or sheet material can be subjected to stretching so as to introduce molecular orientation and provide a film material having a highly birefringent character.
  • ultra-thin birefringent films can be fabricated using the known methods and technologies to produce optically anisotropic retardation layers composed of organic dye LLC systems.
  • manufacture of thin crystalline optically anisotropic layers based on disulfoacids of the cis- and trans-isomeric mixtures of dibenzimidazoles of naphthalenetetracarboxylic acid has been described by P. Lazarev and M. Paukshto, Thin Crystal Film Retarders (in: Proceeding of the 7th International Display Workshops, Materials and Components, Kobe, Japan, Nov. 29-Dec. 1 (2000), pp. 1159-1160).
  • This technology makes it possible to control the direction of the crystallographic axis of an optical film during application and crystallization of LC molecules on a substrate (e.g., on a glass plate).
  • the obtained films have uniform compositions and high molecular and/or crystal ordering with, which makes them useful optical materials, in particular, for polarizers and birefringent films or retarders (compensators).
  • the present invention provides an organic compound of the general structural formula I
  • Core is a conjugated organic unit capable of forming a rod-like macromolecule
  • n is a number of the conjugated organic units in the rod-like macromolecule
  • G k is a set of ionogenic side-groups
  • k is a number of the side-groups in the set G k ;
  • the set of the ionogenic side-groups provide solubility of the organic compound and its salts and give rigidity to the rod-like macromolecule;
  • the number n provides molecule anisotropy that promotes self-assembling of macromolecules in a solution of the organic compound or its salts, forming lyotropic liquid crystal; and wherein the solution is capable of forming a solid optical retardation layer of positive A-type substantially transparent to electromagnetic radiation in the visible spectral range.
  • the present invention provides an optical film comprising a substrate having front and rear surfaces, and at least one solid retardation layer on the front surface of the substrate, wherein the solid retardation layer comprises at least one organic compound of the general structural formula II
  • Core is a conjugated organic unit capable of forming a rod-like macromolecule
  • n is a number of the conjugated organic units in the rod-like macromolecule
  • G k is a set of ionogenic side-groups
  • k is a number of the side-groups in the set G k
  • X is a counterion selected from a list comprising H + , NH (3-m) R m + (where R is alkyl, m is 1, 2 or 3) Na + , K + , Li + , Cs + , Ba 2+ , Ca 2+ , Mg 2+ , Sr 2+ , Pb 2+ , Zn 2+ , La 3+ , Ce 3+ , Y 3+ , Yb 3+ , Gd 3+ , Zr 4+ and any combination thereof
  • t is the number of counterions; wherein the side-groups and the number k provide solubility of the organic compound and give rigidity to the rod-like macro
  • the present invention provides a method of producing an optical film, comprising the steps of
  • Core is a conjugated organic unit capable of forming a rod-like macromolecule
  • n is a number of the conjugated organic units in the rod-like macromolecule
  • G k is a set of ionogenic side-groups
  • k is a number of the side-groups in the set G k ; wherein the side-groups and the number k provide solubility of the organic compound and its salts and give rigidity to the rod-like macromolecule, and the number n provides molecule anisotropy that promotes self-assembling of macromolecules in a solution of the organic compound or their salt, forming lyotropic liquid crystal;
  • FIG. 1 shows reduced and inherent viscosity measured as a function of polymer concentration in aqueous solution
  • FIG. 2 shows a polarizing microscopy image of the lyotropic liquid crystal solution texture of poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) synthesized in Cs-form (concentration is equal to 5.6 wt. %);
  • FIG. 3 shows a polarizing microscopy image of the optical film comprising solid optical retardation layer produced with Mayer rod coating method and comprising poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide);
  • FIG. 4 shows the refractive indices spectra of the organic retardation layer prepared from poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) (6.0% solution) on a glass substrate;
  • FIG. 5 shows a polarizing microscopy image of the lyotropic liquid crystal solution texture of copolymer of poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) and poly[imino(2-sulfo-1,4-phenylene)iminocarbonyl-1,4-phenylenecarbonyl] synthesized in Cs-form (concentration is approximately 4 wt %);
  • FIG. 6 shows a microscopy image of an optical film comprising a solid optical retardation layer comprising copolymer of poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) and poly[imino(2-sulfo-1,4-phenylene)iminocarbonyl-1,4-phenylenecarbonyl];
  • FIG. 7 schematically shows the cross section of an optical film on a substrate, further comprising adhesive and protective layers
  • FIG. 8 schematically shows the cross section of an optical crystal film with an additional reflective layer
  • FIG. 9 schematically shows the cross section of an optical film with a diffuse or specular reflector as the substrate.
  • visible spectral range refers to a spectral range having the lower boundary approximately equal to 400 nm, and upper boundary approximately equal to 750 nm.
  • retardation layer refers to an optically anisotropic layer which is characterized by three principal refractive indices (n x , n y and n z ), wherein two principal directions for refractive indices n x and n y belong to xy-plane coinciding with a plane of the retardation layer and one principal direction for refractive index (n z ) coincides with a normal line to the retardation layer, and wherein at least two of principal refractive indices are different.
  • a “front surface” of a substrate refers to a surface facing a viewer.
  • a “rear surface” refers to the opposite surface of the front surface.
  • an organic compound of the general structural formula I is provided:
  • Core is a conjugated organic unit capable of forming a rod-like macromolecule
  • n is a number of the conjugated organic units in the rod-like macromolecule
  • G k is a set of ionogenic side-groups
  • k is a number of the side-groups in the set G k .
  • the set of the ionogenic side-groups provide solubility of the organic compound and its salts and give rigidity to the rod-like macromolecule.
  • the number n provides a molecule anisotropy that promotes self-assembling of macromolecules in a solution of the organic compound or its salts, forming lyotropic liquid crystal.
  • the solution is capable of forming a solid retardation layer of positive A-type substantially transparent to electromagnetic radiation in the visible spectral range.
  • the number k is equal to 0, 1, 2, 3, 4, 5, 6, 7, or 8 and the number n belongs to the range from 10 to 100000.
  • the viscosity of the solution decreases down to a value in the range from 10 to 200 mPa ⁇ s.
  • the rod-like macromolecule is a polymeric main rigid-chain, wherein the conjugated organic units are the same.
  • the rod-like macromolecule is a copolymeric main rigid-chain, wherein at least one conjugated organic unit is different from others.
  • the number k is more than 1 and the ionogenic side-groups are the same. In another embodiment of the disclosed organic compound, the number k is more than 1 and at least one said side-group is different from others. In still another embodiment of the disclosed organic compound, at least one conjugated organic unit (Core) of the rod-like macromolecule has the general structural formula III:
  • Core 1 and Core 2 are conjugated organic components
  • Z is selected from the list comprising —O— and —NR—
  • R is a substituent selected from the list comprising hydrogen, linear and branched (C 1 -C 4 )alkyls, phenyl and substituted phenyl, wherein substituents on the phenyl include linear and branched (C 1 -C 4 )alkyls.
  • the conjugated organic components Core1 and Core2 comprise ionogenic groups G independently selected from the structures having general formula I to 2 given in Table 1 and can be the same or different
  • the ionogenic side-groups G are selected from the list comprising —COOH, —SO 3 H, and —H 2 PO 3 , k is equal to 0, 1 or 2, p is equal to 1, 2 or 3.
  • the disclosed organic compound comprises an organic compound which is selected from structures 3-7 shown in Table 2.
  • the disclosed organic compound further comprises additional side-groups independently selected from the list comprising linear and branched (C 1 -C 20 )alkyl, (C 2 -C 20 )alkenyl, and (C 2 -C 20 )alkinyl.
  • at least one of the additional side-groups is connected with the Core via a bridging group A.
  • the bridging group A is selected from the list comprising —C(O)—, —C(O)O—, —C(O)—NH—, —(SO 2 )NH—, —O—, —CH 2 O—, —NH—, >N—, and any combination thereof.
  • the salt is selected from the list comprising alkali-metal salts and ammonium salt.
  • an optical film comprising a substrate having front and rear surfaces. At least one solid retardation layer is provided on the front surface of the substrate.
  • the solid retardation layer comprises at least one organic compound of the general structural formula II:
  • Core is a conjugated organic unit capable of forming a rod-like macromolecule
  • n is a number of the conjugated organic units in the rod-like macromolecule
  • G k is a set of ionogenic side-groups
  • k is a number of the side-groups in the set G k
  • X is a counterion selected from the list comprising H + , NH (3-m) R m + (where R is alkyl, m is 1, 2 or 3) Na + , K + , Li + , Cs + , Ba 2+ , Ca 2+ , Mg 2+ , Sr 2+ , Pb 2+ , Zn 2+ , La 3+ , Ce 3+ , Y 3+ , Yb 3+ , Gd 3+ , Zr 4+ and any combination thereof
  • t is the number of counterions.
  • the side-groups and the number k provide solubility of the organic compound and give rigidity to the rod-like macromolecule.
  • the number n provides molecule anisotropy that promotes self-assembling of macromolecules in a solution of the organic compound or its salts, forming lyotropic liquid crystal.
  • the solid retardation layer is an uniaxial positive A-type layer and is substantially transparent to electromagnetic radiation in the visible spectral range.
  • the number k is equal to 0, 1, 2, 3, 4, 5, 6, 7, or 8 and the number n belongs to the range from 10 to 100000.
  • the viscosity of the solution decreases down to a value in the range from 10 to 200 mPa ⁇ s.
  • the rod-like macromolecule is a polymeric main rigid-chain, wherein the conjugated organic units are the same.
  • the rod-like macromolecule is a copolymeric main rigid-chain, wherein at least one conjugated organic unit is different from others.
  • the number k is more than 1, and the ionogenic side-groups are the same. In another embodiment of the disclosed optical film, the number k is more than 1, and at least one side-group is different from others. In still another embodiment of the disclosed optical film, at least one conjugated organic unit (Core) of the rod-like macromolecule has the general structural formula III:
  • Core 1 and Core 2 are conjugated organic components
  • Z is selected from the list comprising —O— and —NR—
  • R is a substituent selected from the list comprising hydrogen, linear and branched (C 1 -C 4 )alkyls, phenyl and substituted phenyl, wherein substituents on the phenyl include linear and branched (C 1 -C 4 )alkyls.
  • the conjugated organic components Core1 and Core2 comprise ionogenic groups G independently selected from the structures having general formula 1 to 2 shown in Table 1 and can be the same or different.
  • the ionogenic side-groups G are selected from the list comprising —COOH, —SO 3 H, and —H 2 PO 3 , k is equal to 0, 1 or 2, p is equal to 1, 2 or 3.
  • the disclosed optical film comprises an organic compound which is selected from structures 3-7 shown in Table 2.
  • the organic compound further comprises additional side-groups independently selected from the list comprising linear and branched (C 1 -C 20 )alkyl, (C 2 -C 20 )alkenyl, and (C 2 -C 20 )alkinyl.
  • at least one of the additional side-groups is connected with the Core via a bridging group A.
  • the bridging group A may be selected from the list comprising —C(O)—, —C(O)O—, —C(O)—NH—, —(SO 2 )NH—, —O—, —CH 2 O—, —NH—, >N—, and any combination thereof.
  • the salt is selected from the list comprising alkali-metal salts and ammonium salt.
  • the disclosed optical film further comprises inorganic compounds which are selected from the list comprising hydroxides and salts of alkali metals.
  • the substrate is preferably transparent to electromagnetic radiation in the visible spectral range.
  • the substrate may comprise a polymer, for example PET (polyethylene terephthalate).
  • the substrate comprises a glass.
  • the transmission coefficient of the substrate does not exceed 2% at any wavelength in the UV spectral range.
  • the transmission coefficient of the substrate in the visible spectral range is not less than 90%.
  • the rear surface of the substrate is covered with an additional antireflection or antiglare coating.
  • the rear surface of the substrate further contains a reflective layer.
  • the disclosed invention also provides an optical film further comprising an additional adhesive optically transparent layer placed on the reflective layer.
  • the optically clear acrylic adhesives may be used as adhesive material.
  • the optical film further comprises an additional transparent adhesive layer placed on top of the optical film.
  • the transmission coefficients of the adhesive layer do not exceed 2% at any wavelength in the 100-400 nm range.
  • the adhesive layer could be isotropic or anisotropic.
  • the optical film further comprises a protective coating formed on the adhesive transparent layer.
  • the substrate is a specular or diffusive reflector. In another embodiment of the optical film, the substrate is a reflective polarizer. In still another embodiment, the optical film further comprises a planarization layer deposited onto the front surface of the substrate. In yet another embodiment of the invention, the optical film further comprises an additional transparent adhesive layer placed on top of the organic layer. In another possible embodiment of the invention, the optical film further comprises an additional transparent adhesive layer placed on top of the optical film. In one embodiment of the disclosed invention, the optical film further comprises a protective coating formed on the adhesive transparent layer.
  • the transmission coefficient of the adhesive layer does not exceed 2% at any wavelength in the UV spectral range. In another embodiment of the disclosed optical film, the transmission coefficient of the adhesive layer in the visible spectral range is not less than 90%.
  • a method of producing an optical film comprises the following steps:
  • Core is a conjugated organic unit capable of forming a rod-like macromolecule
  • n is a number of the conjugated organic units in the rod-like macromolecule
  • G k is a set of ionogenic side-groups
  • k is a number of the side-groups in the set G k ; wherein the side-groups and the number k provide solubility of the organic compound and its salts and give rigidity to the rod-like macromolecule, and the number n provides molecule anisotropy that promotes self-assembling of macromolecules in a solution of the organic compound or its salt, forming lyotropic liquid crystal;
  • the number k is equal to 0, 1, 2, 3, 4, 5, 6, 7, or 8 and the number n belongs to the range from 10 to 100000.
  • the viscosity of the solution decreases down to a value in the range from 10 to 200 mPa ⁇ s.
  • the alignment step is performed simultaneously with the step of application of the liquid layer to the substrate.
  • the rod-like macromolecule is a polymeric main rigid-chain, wherein the conjugated organic units are the same.
  • the rod-like macromolecule is a copolymeric main rigid-chain, wherein at least one conjugated organic unit is different from others.
  • the number k is more than 1, and the ionogenic side-groups are the same. In another embodiment of the disclosed method, the number k is more than 1, and at least one said side-group is different from others. In still another embodiment of the disclosed method, at least one conjugated organic unit (Core) of the rod-like macromolecule has the general structural formula III:
  • Core 1 and Core 2 are conjugated organic components
  • Z is selected from the list comprising —O— and —NR—
  • R is a substituent selected from the list comprising hydrogen, linear and branched (C 1 -C 4 )alkyls, phenyl and substituted phenyl, wherein substituents on the phenyl include linear and branched (C 1 -C 4 )alkyls.
  • the conjugated organic components Core1 and Core2 comprise ionogenic groups G independently selected from the structures having general formula 1 to 2 shown in Table 1 and can be the same or different:
  • the ionogenic side-groups G are selected from the list comprising —COOH, —SO 3 H, and —H 2 PO 3 , k is equal to 0, 1 or 2, p is equal to 1, 2 or 3.
  • the disclosed method uses an organic compound which has the structure selected from structures 3-7 shown in Table 2.
  • the liquid layer further comprises a solvent selected from the list comprising water, water-miscible solvent, and any combination thereof.
  • the organic compound further comprises the additional side-groups.
  • additional side-groups are independently selected from the list comprising linear and branched (C 1 -C 20 )alkyl, (C 2 -C 20 )alkenyl, and (C 2 -C 20 )alkinyl.
  • at least one of the ionogenic side-groups is connected with the Core via a bridging group A.
  • the bridging group A may be selected from the list comprising —C(O)—, —C(O)O—, —C(O)—NH—, —(SO 2 )NH—, —O—, —CH 2 O—, —NH—, >N—, and any combination thereof.
  • the organic solvent is selected from the list comprising ketones, carboxylic acids, hydrocarbons, cyclohydrocarbons, chlorohydrocarbons, alcohols, ethers, esters, and any combination thereof.
  • the organic solvent is selected from the list comprising acetone, xylene, toluene, ethanol, methylcyclohexane, ethyl acetate, diethyl ether, octane, chloroform, methylenechloride, dichloroethane, trichloroethene, tetrachloroethene, carbon tetrachloride, 1,4-dioxane, tetrahydrofuran, pyridine, triethylamine, nitromethane, acetonitrile, dimethylformamide, dimethulsulfoxide, and any combination thereof.
  • the disclosed solution is a lyotropic liquid crystal solution.
  • the solution is an isotropic solution.
  • the salt is selected from the list comprising alkali-metal salts and ammonium salt.
  • the lyotropic liquid crystal may further comprise inorganic compounds which are selected from the list comprising hydroxides and salts of alkali metals.
  • the substrate is made of a material selected from the list comprising a polymer and a glass.
  • the disclosed method may further comprise a post-treatment step with a solution of any aqueous-soluble inorganic salt with a cation selected from the list comprising H + , Ba 2+ , Pb 2+ , Ca 2+ , Mg 2+ , Sr 2+ , La 3+ , Zn 2+ , Zr 4+ , Ce 3+ , Y 3+ , Yb 3+ , Gd 3+ and any combination thereof.
  • the application of the liquid layer to the substrate step and the post-treatment step are carried out simultaneously.
  • the drying and post-treatment steps are carried out simultaneously.
  • the post-treatment step is carried out after drying.
  • the alignment action on the deposited liquid layer is performed with use of equipment selected from the list comprising Mayer rod, slot die, extrusion, roll coating, curtain coating, knife coating and molding.
  • the external alignment action on the deposited layer is performed with the use of mechanical translation over the layer of at least one aligning tool and the distance from the substrate surface to the edge or the plane of the aligning tool is set so as to obtain desired retardation layer thickness.
  • the aligning tool may be heated.
  • the drying step is executed in airflow and/or elevated temperature.
  • the disclosed method further comprises a pretreatment step before the application onto the substrate.
  • This pretreatment step may comprise the step of making the surface of the substrate hydrophilic.
  • the pretreatment further comprises application of a planarization layer.
  • the sequence of the technological steps are repeated two or more times and the solution used in the fabrication of each subsequent solid retardation layer is either the same or different from that used in the previous cycle.
  • This example describes synthesis of poly(2,2′-disulfo-4,4′-benzidine terephthalamide) cesium salt (structure #3 in Table 2).
  • the emulsion was diluted with 40 ml of water, and the stirring speed was reduced to 100 rpm. After the reaction mass has been homogenized the polymer was precipitated via adding 250 ml of acetone. Fibrous sediment was filtered and dried.
  • GPC Gel permeation chromatography
  • This example describes synthesis of poly(2,2′-disulfo-4,4′-benzidine sulfoterephthalamide) (structure #4 in Table 2).
  • This example describes synthesis of poly(para-phenylene sulfoterephthalamide) (structure #5 in Table 2).
  • This example describes synthesis of poly(2-sulfo-1,4-phenylene sulfoterephthalamide) (structure #6 in Table 2).
  • This example describes synthesis of poly(2,2′-disulfo-4,4′-benzidine naphthalene-2,6-dicarboxamide) cesium salt (structure #7 in Table 2).
  • This example describes the preparation of the organic optical film using a lyotropic liquid crystal solution.
  • the polymer poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) (structural formula #3 in Table 2) was synthesized as described in Example 1.
  • the polymer was synthesized in a Cs-form. Reduced and inherent viscosity was measured as a function of polymer concentration in aqueous solution containing 0.1N NaCl (measurements performed at 25° C.) (see FIG. 1 ). Intrinsic viscosity was found equal to 5.1 dl/g. Such a value indicates rather high molecular weight of the product along with a self-assembling in aqueous solution at low concentration (see FIG.
  • Lyotropic liquid crystal solution was prepared according to the following procedure: 1% water solution was prepared, filtered from mechanical admixtures, and concentrated to approximately 5.6 wt. % via evaporation.
  • Fisherbrand microscope glass slides were prepared for coating by treating in a 10% NaOH solution for 30 min, rinsing with deionized water, and drying in airflow with the aid of a compressor.
  • the obtained solution was applied at a temperature of 23° C. and a relative humidity of 50% onto the glass plate surface with a Mayer rod #4 moved at a linear velocity of 100 mm/s.
  • the liquid layer of the solution was dried at the same humidity and temperature.
  • the made optical film comprising solid retardation layer of approximate thickness of 180 nm is shown in FIG. 3 .
  • the x is a coating direction.
  • the optical transmission and reflection spectra were measured in a wavelength range from approximately 400 to approximately 700 nm using a Cary 500 Scan spectrophotometer.
  • the optical transmission of the solid retardation layer was measured using light beams linearly polarized parallel and perpendicular to the coating direction (T par and T per , respectively), propagating in direction perpendicular to the retardation layer plane.
  • the optical reflection was measured using S-polarized light propagating at an angle 12 degree to the normal of the retardation layer plane and polarized parallel and perpendicular to the coating direction (R par and R per , respectively).
  • the phase retardation of the samples was measured at incident angles 0, 30, 45 and 60 degrees using Axometrics Mueller Matrix polarimeter.
  • the obtained data were used to calculate the refractive indices (n x , n y , and n z ) presented in FIG. 4 .
  • This example describes preparation of the organic optical film using a lyotropic liquid crystal solution.
  • the copolymer comprising approximately 70% of poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) (structural formula #3 in Table 2) and approximately 30% of poly(para-phenylene sulfoterephthalamide) (structural formula #5 in Table 2) was synthesized as described in Example 3.
  • the polymer was synthesized in Cs-form.
  • Lyotropic liquid crystalline solution FIG. 5
  • 1% water solution was prepared, filtered in order to rid of mechanical admixtures and concentrated to 4 wt % via evaporation.
  • Fisherbrand microscope glass slides were prepared for coating by treating in a 10% NaOH solution for 30 min, rinsing with deionized water, and drying in airflow with the aid of a compressor.
  • the obtained solution was applied at a temperature of 23° C. and a relative humidity of 50% onto the glass plate surface with a Mayer rod #4 moved at a linear velocity of 100 mm/s.
  • the liquid layer of the solution was dried at the same humidity and temperature.
  • the made optical film comprising solid retardation layer of approximate thickness 150 nm was optically characterized using the same procedure as described in Example 1.
  • the x is a coating direction.
  • FIG. 7 shows the cross section of an optical film formed on substrate 1 .
  • the film contains solid optical retardation layer 2 , adhesive layer 3 , and protective layer 4 .
  • the solid retardation layer may be manufactured using the methods described in Example 1.
  • the polymer layer 4 protects the optical film from damage in the course of its transportation.
  • This optical film is a semi-product, which may be used as an external retarder in, for example, LCDs. Upon removal of the protective layer 4 , the remaining optical film is applied onto an LCD glass with adhesive layer 3 .
  • an additional reflective layer 6 can be formed on the substrate ( FIG. 8 ).
  • the reflective layer may be obtained, for example, by depositing an aluminium film.
  • the solid retardation layer 2 is applied onto the diffuse or specular semitransparent reflector 6 that serves as a substrate ( FIG. 9 ).
  • the reflector layer 6 may be covered with the planarization layer 7 (optional).
  • Polyurethane or an acrylic polymer or any other material can be used for making this planarization layer.

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US20130251947A1 (en) * 2012-02-10 2013-09-26 Crysoptix Kk Optical film
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US9360596B2 (en) 2013-04-24 2016-06-07 Light Polymers Holding Depositing polymer solutions to form optical devices
US9829617B2 (en) 2014-11-10 2017-11-28 Light Polymers Holding Polymer-small molecule film or coating having reverse or flat dispersion of retardation
US9856172B2 (en) 2015-08-25 2018-01-02 Light Polymers Holding Concrete formulation and methods of making
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US20130251947A1 (en) * 2012-02-10 2013-09-26 Crysoptix Kk Optical film
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US10421239B2 (en) * 2012-12-17 2019-09-24 Nitto Denko Corporation Method for producing an optical laminate comprising a stretched resin film and a polarizing film using a diluted lyotropic liquid crystal compound solution
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