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Koji Takaku

Koji Takaku, Kanagawa JP

Patent application numberDescriptionPublished
20080286497LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL DEVICE, REFLECTIVE DISPLAY MATERIAL, AND LIGHT MODULATING MATERIAL - At least one cholesteric liquid crystal composition is mixed with at least one first nematic liquid crystal compound or composition, thereby exhibiting a TGBA phase at room temperature. The first nematic liquid crystal compound or composition preferably includes a compound having a cyano group, a halogen atom, a nitro group, a perfluoroalkoxy group or a perfluoroalkyl group at the terminal thereof. The cholesteric liquid crystal composition preferably contains a second nematic liquid crystal compound or composition and a chiral reagent.11-20-2008
20080292817LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL ELEMENT, REFLECTIVE DISPLAY MATERIAL, LIGHT-CONTROLLING MATERIAL, AND METHOD OF PREPARING LIQUID CRYSTAL COMPOSITION - The present invention provides a liquid crystal composition having at least a liquid crystal and a chiral dopant, in which the chiral dopant is a compound having a liquid crystalline group of a specific structure bonded to a rigid optically active compound. The present invention provides a liquid crystal element having at least a pair of electrodes in which at least one of the electrodes is a transparent electrode, and a liquid crystal layer containing the liquid crystal composition. The present invention also provides a reflective display material and a light-controlling material having at least the liquid crystal element, and a method of preparing the liquid crystal element by adding the chiral dopant to a host liquid crystal.11-27-2008
20090074991LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL DEVICE, REFLECTION DISPLAY MATERIAL, LIGHT MODULATING MATERIAL, AND ANTHRAQUINONE COMPOUND - The liquid crystal composition of the present invention contains a compound represented by the following Formula (1) and a liquid crystal. In Formula (1), at least one among R03-19-2009
20090297735LIGHT MODULATING MATERIAL AND LIGHT MODULATING METHOD - A light modulating material comprising at least one kind of dichroic dye having a substituent represented by the following Formula (1) and at least one kind of host liquid crystal between a pair of electrodes, and changing the transmittance of incident light. In the formula (1), Het is oxygen atom or sulfur atom; B12-03-2009
20100039595LIQUID CRYSTAL DEVICE - A liquid crystal device including a pair of electrodes provided with a vertical alignment film and a liquid crystal layer disposed between the pair of electrodes and including a liquid crystal composition containing a liquid crystal with positive dielectric anisotropy, a dichroic dye and a chiral reagent, with a ratio (P/G) of a chiral pitch length (P) of the liquid crystal composition to a gap (G) between the pair of electrodes being from 0.06 to less than 1.0.02-18-2010
20100103337LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL DEVICE, REFLECTIVE DISPLAY MATERIAL, AND LIGHT MODULATING MATERIAL - The liquid crystal composition of the invention exhibits selective reflection and changes its selective reflection wavelength by a redox reaction induced by an electric field. The liquid crystal device of the invention has a pair of electrodes, at least one of which is a transparent electrode, and a liquid crystal layer containing the liquid crystal composition between the electrodes. The reflective display material and the light modulating material of the invention include the liquid crystal device described above.04-29-2010
20100105937COMPOUND HAVING ASYMMETRIC CARBON ATOM, OXIDATION-REDUCTION REACTION CAUSING PORTION, AND LIQUID CRYSTAL SUBSTITUENT - Disclosed is a compound represented by Formula (1). In Formula (1), * represents an asymmetric carbon atom; L and L′ each independently represent a divalent linking group; Rd represents an oxidation-reduction reaction causing portion; B and B′ each independently represent a liquid crystal substituent; D represents an arylene group, a hetero arylene group, or a divalent alicyclic hydrocarbon group; R represents a substituent; x represents 0 or 1; z represents an integer of from 0 to 3; w represents 0 or 1; n represents 0 or 1; v represents an integer of from 0 to 5; when z is 2 or more, plural B′s may be the same or different; and when v is 2 or more, plural R′s may be the same or different.04-29-2010

Patent applications by Koji Takaku, Kanagawa JP

Koji Takaku, Ashigarakami-Gun JP

Patent application numberDescriptionPublished
20090098314Liquid crystal composition, liquid crystal device, reflective display material and light modulating material - A liquid crystal composition including a liquid crystal and at least three anthraquinone dyes, at least two of the anthraquinone dyes having a substituent represented by the following Formula (I):04-16-2009