Patents by Inventor Kazuaki Hatsusaka

Kazuaki Hatsusaka 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).

  • Patent number: 9771517
    Abstract: The liquid crystal light modulator includes a first substrate (10) and a second substrate (20) disposed between two polarizers, and a pair of electrode structures (24, 24). The substrates include homeotropic alignment films (12) and (22), and at least one of the substrates has a function of aligning C-directors of liquid crystal molecules along one direction. The one direction forms an azimuth angle in the range of 35 to 55 degrees with the direction of the electric field generated by the pair of electrode structures (24, 24). A liquid crystal composition layer (31) contains a ferroelectric liquid crystal composition having a chiral smectic C phase or a liquid crystal composition that has an achiral smectic C phase and negative dielectric anisotropy. Light transmittance is modulated by the electric field generated by the electrode structures (24, 24) changing the birefringence index of the liquid crystal composition layer (31).
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: September 26, 2017
    Assignee: DIC CORPORATION
    Inventors: Toru Fujisawa, Kazuaki Hatsusaka, Kazunori Maruyama, Isa Nishiyama
  • 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
  • Publication number: 20170158793
    Abstract: There is provided a polymerizable liquid crystal composition that enables a film formed through application of the composition and exposure thereof to heat or active energy rays to have an excellent molecular alignment and reduced haze. There is also provided an optically anisotropic body that is produced by using such a polymerizable liquid crystal composition and that has a good transparency. In particular, the present invention provides a polymerizable liquid crystal composition containing a polymerizable haze-reducing agent and a polymerizable liquid crystal compound. Furthermore, the present invention also provides an optically anisotropic body produced by using the polymerizable liquid crystal composition of the present invention.
    Type: Application
    Filed: June 16, 2015
    Publication date: June 8, 2017
    Applicant: DIC CORPORATION
    Inventors: Kouichi Endo, Mika Yamamoto, Kazuaki Hatsusaka
  • Publication number: 20160370626
    Abstract: The present invention provides a liquid crystal display device which can prevent a decrease in a voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID) and solve a problem of a display defect such as white spots, alignment irregularities, burn-in, or the like. The present-invention provides a liquid crystal display device which uses a liquid crystal composition containing a liquid crystal compound having a specific structure as a liquid crystal layer, and an optically anisotropic body obtained by polymerizing a polymerizable liquid crystal composition containing a polymerizable liquid crystal compound having a specific structure at a specific ratio as an in-cell type retardation film.
    Type: Application
    Filed: February 24, 2015
    Publication date: December 22, 2016
    Applicant: DIC CORPORATION
    Inventors: Shinji OGAWA, Yoshinori IWASHITA, Mika YAMAMOTO, Yasuhiro KUWANA, Koichi ENDOU, Kazuaki HATSUSAKA
  • 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
  • Publication number: 20160194561
    Abstract: The present invention provides a novel liquid crystal composition which exhibits a smectic C* phase and in which a fluorine-substituent-introduced liquid crystal compound that exhibits a smectic C* phase is used to enhance the reliability of a liquid crystal device driven by a TFT and to decrease the melting point thereof for expansion of the operation temperature of the liquid crystal device. The liquid crystal composition of the present invention contains at least two liquid crystal compounds each containing a mesogenic group having at least three rings of which at least one is a 2,3-difluorobenzene-1,4-diyl group and two terminal groups having different structures, wherein a compound having a pyrimidine skeleton is not used.
    Type: Application
    Filed: March 23, 2014
    Publication date: July 7, 2016
    Applicant: DIC Corporation
    Inventors: Toru Fujisawa, Kazuaki Hatsusaka, Kazunori Maruyama, Isa Nishiyama
  • Publication number: 20160130502
    Abstract: The present invention relates to a liquid crystal display device that includes a particular color filter containing a material containing chiral liquid crystals and a particular pigment. The present invention provides a liquid crystal display device that can prevent a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and solve the problem of display defects, such as white spots, variations in alignment, and burn-in. Because liquid crystal display devices according to the present invention characteristically prevent a decrease in the voltage holding ratio (VHR) of a liquid crystal layer and reduces the occurrence of display defects, such as burn-in, the liquid crystal display devices are particularly useful as liquid crystal display devices in IPS mode and FFS mode for active-matrix driving and can be applied to household electrical appliances, automobiles, production facilities, measuring and analytical instruments, and communication devices.
    Type: Application
    Filed: June 6, 2014
    Publication date: May 12, 2016
    Applicant: DIC Corporation
    Inventors: Kazuaki Hatsusaka, Hidenari Akiyama, Akira Kimura, Seiji Funakura, Katsunori Shimada
  • Publication number: 20160017226
    Abstract: The liquid crystal light modulator includes a first substrate (10) and a second substrate (20) disposed between two polarizers, and a pair of electrode structures (24, 24). The substrates include homeotropic alignment films (12) and (22), and at least one of the substrates has a function of aligning C-directors of liquid crystal molecules along one direction. The one direction forms an azimuth angle in the range of 35 to 55 degrees with the direction of the electric field generated by the pair of electrode structures (24, 24). A liquid crystal composition layer (31) contains a ferroelectric liquid crystal composition having a chiral smectic C phase or a liquid crystal composition that has an achiral smectic C phase and negative dielectric anisotropy. Light transmittance is modulated by the electric field generated by the electrode structures (24, 24) changing the birefringence index of the liquid crystal composition layer (31).
    Type: Application
    Filed: June 5, 2013
    Publication date: January 21, 2016
    Applicant: DIC CORPORATION
    Inventors: Toru Fujisawa, Kazuaki Hatsusaka, Kazunori Maruyama, Isa Nishiyama
  • Patent number: 9156931
    Abstract: There are provided a radical polymerizable composition having a low viscosity suitable for coating, a cured product obtained by curing the composition, the cured product having a high refractive index and high toughness and being not easily cracked or chipped when cutting, and a plastic lens obtained by curing the composition. A radical polymerizable composition includes phenylbenzyl(meth)acrylate (A), a urethane(meth)acrylate (X) having an aromatic ring in its molecular structure, and a radical polymerization initiator (Y) as essential components.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: October 13, 2015
    Assignee: DIC Corporation
    Inventors: Nobuo Kobayashi, Akihiro Kondo, Atsuhisa Miyawaki, Naoya Ikushima, Kazuaki Hatsusaka
  • Patent number: 9150680
    Abstract: There are provided a radically polymerizable composition that has a low viscosity suitable for use in coating and that forms a cured product having a high refractive index, a cured product formed by curing the composition, and plastic lens formed by curing the composition. The radically polymerizable composition includes, as essential components, phenylbenzyl acrylate (A); and bis[(meth)acryloylmethyl]biphenyl (B) or biphenyl compound (C) having a molecular structure in which biphenyl structures are bonded to each other through a methylene.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: October 6, 2015
    Assignee: DIC Corporation
    Inventors: Akihiro Kondo, Atsuhisa Miyawaki, Nobuo Kobayashi, Naoya Ikushima, Kazuaki Hatsusaka
  • Publication number: 20150259600
    Abstract: There is provided a liquid crystal composition which enables a significant reduction in crystallization temperature as compared with addition of a homologue while having a similar skeleton structure, which has an excellent compatibility, and which enables an increase in the absolute value of negative dielectric anisotropy (??). The liquid crystal composition contains two or more compounds which each have two to four ring structures between two side chains. At least one of the ring structures is a 2,3-difluorobenzene skeleton. The two side chains are bonded to different ring structures. The positions of the 2,3-difluorobenzene skeletons are different from each other, and the number of the ring structures are the same as each other.
    Type: Application
    Filed: June 5, 2013
    Publication date: September 17, 2015
    Applicant: DIC CORPORATION
    Inventors: Toru Fujisawa, Kazuaki Hatsusaka, Kazunori Maruyama, Isa Nishiyama
  • Publication number: 20150057422
    Abstract: There are provided a radically polymerizable composition that has a low viscosity suitable for use in coating and that forms a cured product having a high refractive index, a cured product formed by curing the composition, and plastic lens formed by curing the composition. The radically polymerizable composition includes, as essential components, phenylbenzyl acrylate (A); and bis[(meth)acryloylmethyl]biphenyl (B) or biphenyl compound (C) having a molecular structure in which biphenyl structures are bonded to each other through a methylene.
    Type: Application
    Filed: March 12, 2012
    Publication date: February 26, 2015
    Applicant: DIC CORPORATION
    Inventors: Akihiro Kondo, Atsuhisa Miyawaki, Nobuo Kobayashi, Naoya Ikushima, Kazuaki Hatsusaka
  • Patent number: 8927650
    Abstract: There are provided a radical polymerizable composition having a low viscosity suitable for coating and a cured product and a plastic lens each obtained by curing the composition, the cured product having a high refractive index, good adhesiveness to a plastic film substrate, and good adhesiveness kept even under high-temperature and high-humidity conditions. The radical polymerizable composition includes phenylbenzyl (meth)acrylate (A), an epoxy (meth)acrylate (X) having an aromatic ring in its molecular structure, and a radical polymerization initiator (Y) as essential components.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: January 6, 2015
    Assignee: DIC Corporation
    Inventors: Nobuo Kobayashi, Akihiro Kondo, Atsuhisa Miyawaki, Naoya Ikushima, Kazuaki Hatsusaka
  • Patent number: 8912300
    Abstract: There are provided a radical polymerizable composition having a low viscosity suitable for coating and a cured product and a plastic lens each obtained by curing the composition, the cured product having a high refractive index, good adhesiveness to a plastic film substrate, and good adhesiveness kept even under high-temperature and high-humidity conditions. The radical polymerizable composition includes phenylbenzyl (meth)acrylate (A), an epoxy (meth)acrylate (X) having an aromatic ring in its molecular structure, and a radical polymerization initiator (Y) as essential components.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: December 16, 2014
    Assignee: DIC Corporation
    Inventors: Nobuo Kobayashi, Akihiro Kondo, Atsuhisa Miyawaki, Naoya Ikushima, Kazuaki Hatsusaka
  • Publication number: 20140327862
    Abstract: The present invention relates to a ferroelectric liquid crystal composition and a ferroelectric liquid crystal display element. The present invention provides a ferroelectric liquid crystal composition and a ferroelectric liquid crystal display element using this ferroelectric liquid crystal. The ferroelectric liquid crystal composition of the present invention contains at least one liquid crystal compound and has a chiral smectic C phase, and when the ferroelectric liquid crystal composition is sandwiched between substrates, a layer normal direction of the chiral smectic C phase is 80° to 90° with respect to the substrate surface. According to the ferroelectric liquid crystal composition and the ferroelectric liquid crystal display element of the present invention, since an alignment restoring ability is excellent, the present invention is useful for application in which a pressing force is repeatedly applied.
    Type: Application
    Filed: November 14, 2012
    Publication date: November 6, 2014
    Applicants: DIC CORPORATION, DIC CORPORATION
    Inventors: Kazuaki Hatsusaka, Toru Fujisawa, Kazunori Maruyama, Isa Nishiyama
  • Publication number: 20140313468
    Abstract: A ferroelectric liquid crystal composition having a chiral smectic C-phase is disposed as a liquid crystal composition layer between a first substrate and a second substrate arranged between two polarizing plates of which the planes of polarization are orthogonal to each other. The substrates are provided with vertically oriented films, respectively, and at least one of them is provided with orientation treatment that can form a pretilt angle in a certain direction. The C-director of the liquid crystal molecule is oriented in the certain direction at a portion being in contact with the substrate provided with the orientation treatment and is twisted by at least 180° between the first substrate and the second substrate. At least one of the substrates is provided with a pair of electrode structures generating electric fields approximately parallel to each other.
    Type: Application
    Filed: November 15, 2012
    Publication date: October 23, 2014
    Applicant: DIC CORPORATION
    Inventors: Toru Fujisawa, Kazuaki Hatsusaka, Kazunori Maruyama, Isa Nishiyama
  • Publication number: 20140148525
    Abstract: There are provided a radical polymerizable composition having a low viscosity suitable for coating, a cured product obtained by curing the composition, the cured product having a high refractive index and high toughness and being not easily cracked or chipped when cutting, and a plastic lens obtained by curing the composition. A radical polymerizable composition includes phenylbenzyl(meth)acrylate (A), a urethane(meth)acrylate (X) having an aromatic ring in its molecular structure, and a radical polymerization initiator (Y) as essential components.
    Type: Application
    Filed: March 12, 2012
    Publication date: May 29, 2014
    Applicant: DIC CORPORATION
    Inventors: Nobuo Kobayashi, Akihiro Kondo, Atsuhisa Miyawaki, Naoya Ikushima, Kazuaki Hatsusaka
  • Publication number: 20140128562
    Abstract: There are provided a radical polymerizable composition having a low viscosity suitable for coating and a cured product and a plastic lens each obtained by curing the composition, the cured product having a high refractive index, good adhesiveness to a plastic film substrate, and good adhesiveness kept even under high-temperature and high-humidity conditions. The radical polymerizable composition includes phenylbenzyl (meth)acrylate (A), an epoxy (meth)acrylate (X) having an aromatic ring in its molecular structure, and a radical polymerization initiator (Y) as essential components.
    Type: Application
    Filed: March 12, 2012
    Publication date: May 8, 2014
    Applicant: DIC CORPORATION
    Inventors: Nobuo Kobayashi, Akihiro Kondo, Atsuhisa Miyawaki, Naoya Ikushima, Kazuaki Hatsusaka
  • Publication number: 20140114037
    Abstract: There are provided a radical polymerizable composition having a low viscosity suitable for coating and a cured product and a plastic lens each obtained by curing the composition, the cured product having a high refractive index, good adhesiveness to a plastic film substrate, and good adhesiveness kept even under high-temperature and high-humidity conditions. The radical polymerizable composition includes phenylbenzyl (meth)acrylate (A), an epoxy (meth)acrylate (X) having an aromatic ring in its molecular structure, and a radical polymerization initiator (Y) as essential components.
    Type: Application
    Filed: December 30, 2013
    Publication date: April 24, 2014
    Applicant: DIC CORPORATION
    Inventors: Nobuo Kobayashi, Akihiro Kondo, Atsuhisa Miyawaki, Naoya Ikushima, Kazuaki Hatsusaka
  • Patent number: 8405799
    Abstract: An object of the present invention is to obtain a polymer-stabilized liquid crystal composition which can suppress dependency of a driving voltage on a temperature by decreasing the driving voltage. To a low-molecular liquid crystal compound, a chiral compound, and a specific acrylate and a polymerizable liquid crystal compound as polymerizable acrylate compounds are added, to prepare a polymer-stabilized liquid crystal composition. By subjecting the polymer-stabilized liquid crystal composition to ultraviolet exposure while maintaining a desired alignment state to form a polymer chain in a liquid crystal phase, a polymer-stabilized liquid crystal display device containing a low-molecular liquid crystal in a stabilized alignment state is obtained.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: March 26, 2013
    Assignee: DIC Corporation
    Inventors: Toru Fujisawa, Kiyofumi Takeuchi, Kazuaki Hatsusaka, Isa Nishiyama, Shunsuke Kobayashi