Patents by Inventor Hidetoshi Nakata

Hidetoshi Nakata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210223586
    Abstract: The present invention relates to light-scattering liquid crystal devices suited for use in light control glass such as optical shutters and use in segment displays in, for example, clocks. A light-scattering liquid crystal device according to the present invention includes two substrates 1, of which at least one includes an electrode layer 2 and at least one is transparent, and a light control layer 4 held between the substrates, the light control layer 4 containing a liquid crystal material and a polymer substance, wherein the light-scattering liquid crystal device includes, between the substrates and the light control layer, a thin film layer 3 formed by subjecting a thermally curable compound containing a reactive group to thermal curing. According to the present invention, a light-scattering liquid crystal device having dramatically improved adhesion can be provided.
    Type: Application
    Filed: July 23, 2019
    Publication date: July 22, 2021
    Applicant: DIC Corporation
    Inventors: Hidetoshi Nakata, Keumhee Jang, Kazunori Maruyama
  • Publication number: 20210135168
    Abstract: A foldable circular polarizing plate includes a polarizer and a foldable compensation film disposed on one surface of the polarizer, wherein in-plane retardations of the liquid crystal layer at 450 nm, 550 nm, and 650 nm wavelengths satisfy Relationship Equations 1 or 2, the compensation film is configured to absorb light in a wavelength region of less than or equal to 420 nm, and a reflection color in a CIE-Lab color coordinate system satisfies ?a*b*?5.0 and a foldable organic light emitting diode display including the same.
    Type: Application
    Filed: December 22, 2016
    Publication date: May 6, 2021
    Inventors: Tsuyoshi OHYAMA, Seung Hyun LEE, Hyun-Seok CHOI, Hidetoshi NAKATA, Toru ISHII
  • Publication number: 20200264461
    Abstract: An aspect of the present invention provides a light conversion film including light-emitting nanocrystalline particles configured to convert light having a predetermined wavelength into light of any of red, green, and blue and to emit the light, and a wavelength-selective transmission layer disposed on at least one side of the light conversion layer and configured to transmit light in a specific wavelength range.
    Type: Application
    Filed: September 20, 2018
    Publication date: August 20, 2020
    Applicant: DIC CORPORATION
    Inventors: Yasuhiro Kuwana, Hidetoshi Nakata, Hidehiko Yamaguchi, Takayuki Miki, Hirotomo Sasaki, Shunki Sakai
  • Publication number: 20200199452
    Abstract: A polymerizable liquid crystal composition suitable for a heat-resistant, optical film that has a small selective wavelength shift due to thermal history is disclosed. The polymerizable liquid crystal composition contains a bifunctional polymerizable liquid crystal compound represented by the following general formula (I-2), a chiral compound, and an oxime ester polymerization initiator. In formula (I-2), P121 and P122 denote a polymerizable functional group, Sp121 and Sp122 denote a C1-18 alkylene group, a single bond, or the like, X121 and X122 denote —O—, —S—, or the like, q121 and g122 denote 0 or 1, and MG122 denotes a mesogenic group represented by the general formula (I-2-b). In the general formula (I-2-b), A1, A2, and A3 denote a 1,4-phenylene group, a 1,4-cyclohexylene group, or the like, Z1 and Z2 denote —COO—, —OCO—, or the like, and r1 denotes 0, 1, 2 or 3.
    Type: Application
    Filed: May 29, 2018
    Publication date: June 25, 2020
    Applicant: DIC Corporation
    Inventors: Hidetoshi Nakata, Yasuhiro Kuwana
  • Patent number: 10473820
    Abstract: There is provided a compound containing a mesogenic group, which includes a silicon compound at a low concentration, a polymerizable compound containing the mesogenic group, a mixture and a composition using these compounds, a polymerizable mixture having the polymerizable compound, and a polymer, an optically anisotropic body, and a phase difference film using the polymerizable composition. It is possible to obtain the optically anisotropic body and the phase difference film having satisfactory scratch resistance and adhesion, by using the polymerizable composition composed of the compound containing a mesogenic group, which includes a silicon compound at a low concentration.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: November 12, 2019
    Assignee: DIC CORPORATION
    Inventors: Mika Yamamoto, Yasuhiro Kuwana, Hidetoshi Nakata, Koichi Endou, Kunihiko Kotani, Hiroshi Hasebe, Yoshiyuki Ono
  • Patent number: 10351643
    Abstract: An object of the invention is to provide polymerizable compounds having excellent optical characteristics and suited as materials for optically anisotropic articles, compositions containing the polymerizable compounds, polymers obtained by polymerizing the polymerizable compounds, optically anisotropic articles formed of the polymers, and liquid crystal display devices including the optically anisotropic articles.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: July 16, 2019
    Assignee: DIC CORPORATION
    Inventors: Hiroshi Hasebe, Yoshio Aoki, Kunihiko Kotani, Akihiro Koiso, Hidetoshi Nakata
  • Patent number: 10196568
    Abstract: The present invention provides a method for producing a polymerizable liquid crystal composition which produces films being uncolored and having no cissing and good alignment when applied to a substrate, and also provides a polymerizable liquid crystal composition produced by the method and an optically anisotropic body using the polymerizable liquid crystal composition. Specifically, the present invention provides a method for producing a polymerizable liquid crystal composition, the method comprising a step (I) of preparing a polymerizable solution by mixing at least one polymerizable compound having at least one polymerizable functional group and one or two or more organic solvents and heating and stirring the resultant mixture; and a step (II) of mixing the polymerizable solution with a polymerization initiator, and also provides a polymerizable liquid crystal composition produced by the method and an optically anisotropic body using the polymerizable liquid crystal composition.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: February 5, 2019
    Assignee: DIC CORPORATION
    Inventors: Koichi Endou, Yasuhiro Kuwana, Hidetoshi Nakata, Mika Yamamoto, Kunihiko Kotani, Hiroshi Hasebe, Yoshiyuki Ono
  • Patent number: 10106738
    Abstract: An object of the present invention is to provide a polymerizable liquid crystal composition with which two characteristics of smoothness of a surface of an anisotropic optical body and orientation properties of liquid crystals can be simultaneously improved, when preparing an anisotropic optical body to be obtained by photopolymerization of the polymerizable liquid crystal composition. Specifically, an object of the present invention is to provide a polymerizable liquid crystal composition containing specific polymerizable compounds and a fluorine-based surfactant. In addition, an anisotropic optical body, a retardation film, an antireflective film, and a liquid crystal display element prepared using the polymerizable liquid crystal composition of the present invention are also provided.
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: October 23, 2018
    Assignee: DIC CORPORATION
    Inventors: Koichi Endou, Yasuhiro Kuwana, Hidetoshi Nakata, Mika Yamamoto, Kazuaki Hatsusaka
  • Publication number: 20180100105
    Abstract: An anisotropic scattering film includes a liquid crystal material. The anisotropic scattering film includes a plurality of uniaxial horizontal alignment regions of the liquid crystal material and a plurality of vertical alignment regions of the liquid crystal material.
    Type: Application
    Filed: December 1, 2017
    Publication date: April 12, 2018
    Applicant: DIC Corporation
    Inventors: Hiroshi Hasebe, Hidetoshi Nakata
  • Publication number: 20180079959
    Abstract: An object of the present invention is to provide a liquid crystal element which sufficiently optimizes mainly the electrooptical properties of a VA display, has a wide operating temperature range, a high-speed responsiveness at a low temperature, a halftone response speed, a high contrast, a wide viewing angle, a low threshold voltage, and a high resistance value, and includes a small amount of residual monomers and shows a high voltage holding ratio, even after polymerization of a polymerizable liquid crystal compound is performed. As a result of intensive studies to achieve the object described above, the inventors found the optimal configuration of a liquid crystal element and completed the present invention.
    Type: Application
    Filed: March 1, 2016
    Publication date: March 22, 2018
    Applicant: DIC Corporation
    Inventors: Masakazu Kaneoya, Kiyofumi Takeuchi, Hidetoshi Nakata
  • Publication number: 20170355907
    Abstract: The present invention provides a polymerizable liquid crystal composition including a specific polymerizable compound and a fluorosurfactant having specific polyoxyalkylene skeleton and molecular weight. Also, an optically anisotropic body, a phase difference film, an antireflection film, and a liquid crystal display device, which are produced by using the polymerizable liquid crystal composition according to the present invention, are provided. The present invention is useful because three properties, that is, leveling properties of the surface of an optically anisotropic body, offset to a base material, and alignment properties of a liquid crystal can be improved at the same time in the case where the optically anisotropic body is produced by photopolymerizing the polymerizable liquid crystal composition.
    Type: Application
    Filed: December 10, 2015
    Publication date: December 14, 2017
    Applicant: DIC Corporation
    Inventors: Kouichi Endo, Yasuhiro Kuwana, Hidetoshi Nakata, Mika Yamamoto, Kazuaki Hatsusaka
  • Patent number: 9809668
    Abstract: It is an object of the present invention to provide a polymerizable compound suitable as a material for optically anisotropic bodies having excellent optical properties, a composition containing the polymerizable compound, a polymer obtained by polymerizing the polymerizable compound, an optically anisotropic body formed of the polymer, and a liquid crystal display device including the optically anisotropic body.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: November 7, 2017
    Assignee: DIC CORPORATION
    Inventors: Hiroshi Hasebe, Yoshio Aoki, Kunihiko Kotani, Akihiro Koiso, Hidetoshi Nakata
  • Publication number: 20170190819
    Abstract: It is an object of the present invention to provide a polymerizable liquid crystal composition that has an excellent storage stability and that enables a film formed by application of the composition to a base material and the subsequent exposure to heat or active energy rays to have a good adhesion to the base material. It is another object of the present invention to provide an optically anisotropic body that is produced using such a polymerizable composition and that has a good orientation. In particular, the present invention provides a polymerizable liquid crystal composition containing a polymerizable adhesion enhancer and a polymerizable liquid crystal compound. In addition, the present invention also provides an optically anisotropic body containing such a polymerizable liquid crystal composition.
    Type: Application
    Filed: June 16, 2015
    Publication date: July 6, 2017
    Applicant: DIC Corporation
    Inventors: Kouichi Endo, Yasuhiro Kuwana, Hidetoshi Nakata, Mika Yamamoto, Kazuaki Hatsusaka, Isa Nishiyama
  • Patent number: 9676959
    Abstract: A polymerizable composition solution that has good storage stability and allows a polymerizable compound in the polymerizable composition to be aligned well with no defects after application to a base and removal of a solvent by a drying process and also an optically anisotropic body that includes the solution and has good alignment without any defects. A solution containing a polymerizable composition and an organic solvent, wherein the polymerizable composition contains 90 mass % or more of a polymerizable compound intramolecularly having a 2-methyl-1,4-phenylene group as represented by general formula (1) and an optically anisotropic body including the solution.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: June 13, 2017
    Assignee: DIC CORPORATION
    Inventors: Yasuhiro Kuwana, Hidetoshi Nakata, Koichi Endou, Mika Yamamoto, Kunihiko Kotani, Hiroshi Hasebe, Yoshiyuki Ono
  • Publication number: 20170037159
    Abstract: An object of the invention is to provide polymerizable compounds having excellent optical characteristics and suited as materials for optically anisotropic articles, compositions containing the polymerizable compounds, polymers obtained by polymerising the polymerizable compounds, optically anisotropic articles formed of the polymers, and liquid crystal display devices including the optically anisotropic articles.
    Type: Application
    Filed: November 27, 2014
    Publication date: February 9, 2017
    Applicant: DIC CORPORATION
    Inventors: Hiroshi Hasebe, Yoshio Aoki, Kunihiko Kotani, Akihiro Koiso, Hidetoshi Nakata
  • Publication number: 20170029655
    Abstract: It is an object of the present invention to provide a polymerizable compound suitable as a material for optically anisotropic bodies having excellent optical properties, a composition containing the polymerizable compound, a polymer obtained by polymerizing the polymerizable compound, an optically anisotropic body formed of the polymer, and a liquid crystal display device including the optically anisotropic body.
    Type: Application
    Filed: November 27, 2014
    Publication date: February 2, 2017
    Applicant: DIC CORPORATION
    Inventors: Hiroshi HASEBE, Yoshio AOKI, Kunihiko KOTANI, Akihiro KOISO, Hidetoshi NAKATA
  • Publication number: 20170002123
    Abstract: It is an object of the present invention to provide a polymerizable compound suitable as a material for optically anisotropic bodies having excellent optical properties, a composition containing the polymerizable compound, a polymer obtained by polymerizing the polymerizable compound, an optically anisotropic body formed of the polymer, and a liquid crystal display device including the optically anisotropic body.
    Type: Application
    Filed: November 27, 2014
    Publication date: January 5, 2017
    Applicant: DIC CORPORATION
    Inventors: Hiroshi Hasebe, Yoshio Aoki, Kunihiko Kotani, Akihiro Koiso, Hidetoshi Nakata
  • Publication number: 20170003418
    Abstract: There is provided a compound containing a mesogenic group, which includes a silicon compound at a low concentration, a polymerizable compound containing the mesogenic group, a mixture and a composition using these compounds, a polymerizable mixture having the polymerizable compound, and a polymer, an optically anisotropic body, and a phase difference film using the polymerizable composition. It is possible to obtain the optically anisotropic body and the phase difference film having satisfactory scratch resistance and adhesion, by using the polymerizable composition composed of the compound containing a mesogenic group, which includes a silicon compound at a low concentration.
    Type: Application
    Filed: December 18, 2014
    Publication date: January 5, 2017
    Applicant: DIC Corporation
    Inventors: Mika Yamamoto, Yasuhiro Kuwana, Hidetoshi Nakata, Koichi Endou, Kunihiko Kotani, Hiroshi Hasebe, Yoshiyuki Ono
  • Patent number: 9469810
    Abstract: The present invention relates to a polymerizable composition useful as a liquid crystal device, a display, an optical member, a coloring agent, a security marking, and a laser light emitting member and a thin film obtained from the polymerizable composition. The present invention provides a polymerizable liquid crystal composition having excellent solubility into a solvent, exhibiting good adhesion to a base material, and being capable of realizing a thin film having low haze and no variations and, in addition, provides a thin film having excellent appearance by using the polymerizable liquid crystal composition. The polymerizable liquid crystal composition according to the present invention is used and, thereby, a composition and a thin film having low haze and no variations and, at the same time, having excellent adhesion to a base material can be obtained at a low cost.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: October 18, 2016
    Assignee: DIC CORPORATION
    Inventors: Hidetoshi Nakata, Yasuhiro Kuwana, Hiroshi Hasebe, Kunihiko Kotani, Isa Nishiyama
  • Publication number: 20160272888
    Abstract: An object of the present invention is to provide a polymerizable liquid crystal composition with which two characteristics of smoothness of a surface of an anisotropic optical body and orientation properties of liquid crystals can be simultaneously improved, when preparing an anisotropic optical body to be obtained by photopolymerization of the polymerizable liquid crystal composition. Specifically, an object of the present invention is to provide a polymerizable liquid crystal composition containing specific polymerizable compounds and a fluorine-based surfactant. In addition, an anisotropic optical body, a retardation film, an antireflective film, and a liquid crystal display element prepared using the polymerizable liquid crystal composition of the present invention are also provided.
    Type: Application
    Filed: October 7, 2014
    Publication date: September 22, 2016
    Applicant: DIC CORPORATION (TOKYO)
    Inventors: Koichi Endou, Yasuhiro Kuwana, Hidetoshi Nakata, Mika Yamamoto, Kazuaki Hatsusaka