Patents by Inventor Junji Takenaka

Junji Takenaka 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: 20220244428
    Abstract: An ophthalmic medical device including a photochromic polymer having higher transparency under an inactive state through use of a photochromic monomer. An ophthalmic medical device according to one embodiment that includes a photochromic polymer obtained by polymerizing monomer components including a photochromic monomer and a lactam ring-containing monomer, wherein a content ratio of the lactam ring-containing monomer in the monomer components is from 10 wt % to 50 wt %. The ophthalmic medical device is typically a contact lens or an intraocular lens.
    Type: Application
    Filed: June 27, 2019
    Publication date: August 4, 2022
    Applicants: MENICON CO., LTD., TOKUYAMA CORPORATION
    Inventors: Tomomi TOMIDA, Kazuhiko NAKADA, Masaki BABA, Satomu NIIDA, Junji MOMODA, Masayuki MIYAZAKI, Junji TAKENAKA
  • Patent number: 11401276
    Abstract: A chromene compound having at least one indenonaphthopyran moiety which has a group forming a spiro ring together with the 13-position carbon atom and further an oligomer chain group selected from a polyalkylene oxide oligomer chain group having at least three recurring units and a polyester oligomer chain group having at least three recurring units, represented by the following formula and having reduced matrix dependence: wherein R1 and R2 are each a group which may have an oligomer chain group, the ring Z bonded to the 13-position carbon atom of the chromene compound is a Spiro ring group, and R3 and R4 are each an aryl group or heteroaryl group which may have an oligomer chain group. Preferably, the chromene compound has at least one oligomer chain group in the molecule.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: August 2, 2022
    Assignee: TOKUYAMA CORPORATION
    Inventors: Masayuki Miyazaki, Junji Takenaka
  • Publication number: 20220213050
    Abstract: A chromene compound which can exhibit excellent photochromic properties. The chromene compound is represented by the following formula (1). In the formula, at least one of R1 or R2 represents the group having the radical-polymerizable group, wherein the group having a radical-polymerizable group is represented by the following formula (2) (wherein R10 represents a linear or branched alkylene group having 1 to 10 carbon atoms and l represents an integer of from 0 to 50); and the ring Z that is represented by the following formula (Z) and is spiro-bonded to a carbon atom located at position-13 in the formula (1) is preferably an aliphatic cyclic group that may have a substituent, the group having 3 to 20 carbon atoms for forming the ring together with the carbon atom at the 13-position, or the like.
    Type: Application
    Filed: June 8, 2020
    Publication date: July 7, 2022
    Applicant: TOKUYAMA CORPORATION
    Inventors: Masayuki MIYAZAKI, Junji TAKENAKA, Junji MOMODA
  • Publication number: 20220056187
    Abstract: The present invention relates to a curable composition for an optical material, containing (A) 100 parts by mass of a radical polymerizable monomer, (B) 0.1 to 5 parts by mass of an ultraviolet absorber composed of a benzotriazole compound having a specific structure, which has a maximum absorption wavelength of 360 nm or more and less than 380 nm and an absolute value of the difference in solubility parameter (SP value) from the radical polymerizable monomer (A) of 5.5 (cal/cm3)1/2 or less, (C) 1 to 5 parts by mass of an ultraviolet absorber which is at least one selected from a benzotriazole compound, a benzophenone compound and a triazine compound and has a maximum absorption wavelength of less than 360 nm, and (D) 0.05 to 0.5 parts by mass of a radical polymerization initiator.
    Type: Application
    Filed: December 17, 2019
    Publication date: February 24, 2022
    Applicant: TOKUYAMA CORPORATION
    Inventors: Taichi HANASAKI, Ayako OHARA, Junji TAKENAKA, Junji MOMODA
  • Publication number: 20220056170
    Abstract: The present invention is an optical material composition containing (A) 100 parts by mass of a polymerizable monomer, and (B) 0.001 to 0.3 parts by mass of a UV absorbent having a maximum absorption wavelength of 360 nm or more and less than 380 nm and having a specific structure, and an optical material formed of the composition. According to the present invention, there can be provided an optical material composition containing a UV absorbent and having good long-term storage stability, and an optical material formed of the composition, in particular, an optical material composition capable of forming a plastic lens having a high blue light cut rate.
    Type: Application
    Filed: December 17, 2019
    Publication date: February 24, 2022
    Applicant: TOKUYAMA CORPORATION
    Inventors: Ayako OHARA, Taichi HANASAKI, Junji TAKENAKA, Junji MOMODA
  • Publication number: 20220049037
    Abstract: The present invention relates to a curable composition for an optical material, containing (A) 100 parts by mass of a radical polymerizable monomer, (B) 0.005 to 0.5 parts by mass of a tetraazaporphyrin compound having a maximum absorption wavelength in a range of 560 nm or more and 620 nm or less, and (C) 0.1 to 10 parts by mass of an ultraviolet absorber having a maximum absorption wavelength in a range of 330 nm or more and 350 nm or less. According to the present invention, it is possible to provide a curable composition for an optical material, capable of being suitably used as a coating material that can easily provide an optical material having good antiglare properties and excellent weather resistance.
    Type: Application
    Filed: December 17, 2019
    Publication date: February 17, 2022
    Applicant: TOKUYAMA CORPORATION
    Inventors: Ayako OHARA, Taichi HANASAKI, Junji TAKENAKA, Junji MOMODA
  • Publication number: 20210292641
    Abstract: The present invention relates to a photochromic compound including a polyvalent residue on which at least one group having a photochromic moiety is substituted, and at least one long-chain group not containing a photochromic moiety and having a molecular weight of 300 or more is further substituted; and a curable composition containing the same. In accordance with the present invention, it is possible to provide a photochromic compound which has high solubility in a polymerizable compound serving as a matrix while retaining high photochromic characteristics and is hardly affected by the matrix; and a curable composition containing the same.
    Type: Application
    Filed: July 18, 2019
    Publication date: September 23, 2021
    Applicant: TOKUYAMA CORPORATION
    Inventors: Takao NOGUCHI, Junji TAKENAKA, Junji MOMODA, Takayoshi KAWASAKI, Yasutomo SHIMIZU, Masayuki MIYAZAKI
  • Patent number: 11066523
    Abstract: A photochromic polyrotaxane compound which comprises an axial molecule and a plurality of cyclic molecules clathrating the axial molecule, wherein at least one side chain containing a photochromic moiety is bonded to at least one of the cyclic molecules, and a curable composition comprising the photochromic polyrotaxane compound and a polymerizable compound.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: July 20, 2021
    Assignee: TOKUYAMA CORPORATION
    Inventors: Junji Takenaka, Junji Momoda, Takayoshi Kawasaki, Takao Noguchi, Yasutomo Shimizu, Masayuki Miyazaki
  • Publication number: 20210032532
    Abstract: The invention is a photochromic compound having an indenonaphthopyran skeleton, and the indenonaphthopyran skeleton has an alkenyl group having 10 to 30 carbon atoms, and an oligomer chain group A having 3 or more recurring units selected from a polyalkylene oxide oligomer chain group, a polyester oligomer chain group, a polysiloxane chain group and a polyester polyether oligomer chain group. The invention can provide a photochromic compound capable of expressing excellent photochromic characteristics in various cured products and capable of preventing cured products from becoming cloudy.
    Type: Application
    Filed: April 15, 2019
    Publication date: February 4, 2021
    Applicant: TOKUYAMA CORPORATION
    Inventors: Masayuki MIYAZAKI, Junji TAKENAKA
  • Publication number: 20210002545
    Abstract: A photochromic curable composition comprising a radically polymerizable monomer having at least one oxetanyl group in one molecule, a photochromic compound and radically polymerizable monomers other than the above polymerizable monomer, and a photochromic cured body obtained by polymerizing the photochromic curable composition.
    Type: Application
    Filed: March 22, 2019
    Publication date: January 7, 2021
    Applicant: TOKUYAMA CORPORATION
    Inventors: Ayako OHARA, Junji TAKENAKA, Junji MOMODA
  • Publication number: 20210003867
    Abstract: A method of producing a plastic lens having a cured coating layer, comprising the steps of: forming an uncured coating layer from a photocurable coating composition comprising at least a) a photochromic compound, b) a radically polymerizable monomer and c) a photopolymerization initiator on one surface of a plastic lens; and irradiating the plastic lens having the uncured coating layer with light from an LED having an emission peak wavelength of 350 nm or more to less than 450 nm from above the outer surface of the uncured coating layer to cure the uncured coating layer.
    Type: Application
    Filed: March 19, 2019
    Publication date: January 7, 2021
    Applicant: TOKUYAMA CORPORATION
    Inventors: Junji TAKENAKA, Junji MOMODA, Yoshihiro ASAHARA, Takashi TAMUKAI
  • Patent number: 10884334
    Abstract: To provide a photocurable resin composition comprising an N-vinyl amide compound, a polyfunctional (meth)acrylate monomer and a photopolymerization initiator and having excellent adhesion to an optical substrate and free from an appearance defect such as a crack or shrinkage and a laminate having a coat layer obtained by curing the photocurable resin composition.
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: January 5, 2021
    Assignee: TOKUYAMA CORPORATION
    Inventors: Masayuki Miyazaki, Junji Momoda, Junji Takenaka, Takashi Tamukai
  • Publication number: 20200190106
    Abstract: A chromene compound having at least one indenonaphthopyran moiety which has a group forming a spiro ring together with the 13-position carbon atom and further an oligomer chain group selected from a polyalkylene oxide oligomer chain group having at least three recurring units and a polyester oligomer chain group having at least three recurring units, represented by the following formula and having reduced matrix dependence: wherein R1 and R2 are each a group which may have an oligomer chain group, the ring Z bonded to the 13-position carbon atom of the chromene compound is a Spiro ring group, and R3 and R4 are each an aryl group or heteroaryl group which may have an oligomer chain group. Preferably, the chromene compound has at least one oligomer chain group in the molecule.
    Type: Application
    Filed: July 11, 2018
    Publication date: June 18, 2020
    Applicant: TOKUYAMA CORPORATION
    Inventors: Masayuki MIYAZAKI, Junji TAKENAKA
  • Publication number: 20200172681
    Abstract: A photochromic polyrotaxane compound which comprises an axial molecule and a plurality of cyclic molecules clathrating the axial molecule, wherein at least one side chain containing a photochromic moiety is bonded to at least one of the cyclic molecules, and a curable composition comprising the photochromic polyrotaxane compound and a polymerizable compound.
    Type: Application
    Filed: June 18, 2018
    Publication date: June 4, 2020
    Applicant: TOKUYAMA CORPORATION
    Inventors: Junji TAKENAKA, Junji MOMODA, Takayoshi KAWASAKI, Takao NOGUCHI, Yasutomo SHIMIZU, Masayuki MIYAZAKI
  • Publication number: 20180321588
    Abstract: To provide a photocurable resin composition comprising an N-vinyl amide compound, a polyfunctional (meth)acrylate monomer and a photopolymerization initiator and having excellent adhesion to an optical substrate and free from an appearance defect such as a crack or shrinkage and a laminate having a coat layer obtained by curing the photocurable resin composition.
    Type: Application
    Filed: November 10, 2016
    Publication date: November 8, 2018
    Applicant: TOKUYAMA CORPORATION
    Inventors: Masayuki MIYAZAKI, Junji MOMODA, Junji TAKENAKA, Takashi TAMUKAI
  • Publication number: 20180267207
    Abstract: A cured coating layer can be provided to plastic lenses having various shapes with high productivity without causing deformation by providing a plastic lens for light exposure having an uncured coating layer composed of a photocurable composition on one surface and hydrogel adhered to the other surface, curing the uncured coating layer by exposing the uncured coating layer to light, and removing the hydrogel.
    Type: Application
    Filed: January 28, 2016
    Publication date: September 20, 2018
    Applicant: TOKUYAMA CORPORATION
    Inventors: Junji TAKENAKA, Junji MOMODA, Yoshihiro ASAHARA, Takashi TAMUKAI
  • Patent number: 9890324
    Abstract: A curable composition which comprises a carbonate-based polymerizable monomer represented by the following formula, other polymerizable monomers and a photochromic compound, can be used even under high-temperature and high-humidity conditions without any problems and provides a cured product having excellent photochromic properties. wherein A and A? are each a linear or branched alkylene group having 2 to 15 carbon atoms, “a” is an average value of 1 to 20, when there are a plurality of A's, A's may be the same or different, R1 is a hydrogen atom or methyl group, and R2 is a (meth)acryloyloxy group or hydroxyl group.
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: February 13, 2018
    Assignee: TOKUYAMA CORPORATION
    Inventors: Yasutomo Shimizu, Junji Takenaka, Junji Momoda, Katsuhiro Mori
  • Publication number: 20170203526
    Abstract: A photopolymerization device (20) has: a workpiece holding part (1) that holds a workpiece (W); and a photoirradiation device (6) that is arranged above the workpiece holding part (1) and that radiates light toward the workpiece (W). The photopolymerization device (20) is configured such that a reflecting plate (3) that has a reflecting surface that has a specular gloss at angles of 60° of 10-200 is arranged below the workpiece holding part (1) and such that light that arrives at the reflecting surface of the reflecting plate (3) is radiated toward the workpiece (W).
    Type: Application
    Filed: July 21, 2015
    Publication date: July 20, 2017
    Applicant: Tokuyama Corporation
    Inventors: Yoshihiro Asahara, Takashi Tamukai, Junji Takenaka, Junji Momoda, Katsuhiro Mori
  • Patent number: 9588257
    Abstract: A photochromic curable composition comprising, as radically polymerizable component (A), a silsesquioxane component (A1) having a radically polymerizable group and a bifunctional radically polymerizable monomer (A2) represented by the following general formula (1), wherein a is a number of 0 to 30, and b is a number of 0 to 30 on condition that an average value of a+b is 2 to 30, R1, R2, R3 and R4 are each a hydrogen atom or a methyl group, and A is a divalent organic group on condition that the number of carbon atoms is 1 to 20, and a photochromic compound (B).
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: March 7, 2017
    Assignee: Tokuyama Corporation
    Inventors: Toshiaki Otani, Junji Takenaka, Junji Momoda, Shinobu Izumi
  • Patent number: 9447224
    Abstract: A process of producing a urethane (meth)acrylate monomer having a low acid value and a low content of a hardly soluble high-molecular weight impurity which is crosslinked high-dimensionally, comprising the steps of: (1) contacting a first solution containing a urethane (meth)acrylate monomer having an acid value of more than 0.2 mgKOH/g and an organic solvent to a water-containing adsorbent capable of adsorbing an acid component to obtain a second solution containing a urethane (meth)acrylate monomer having an acid value of not more than 0.2 mgKOH/g, the organic solvent and more than 5,000 ppm (mass) of water based on the urethane (meth)acrylate monomer; (2) contacting the second solution to a dehydrating agent to obtain a third solution containing not more than 5,000 ppm (mass) of water based on the urethane (meth)acrylate monomer; and (3) removing the organic solvent from the third solution.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: September 20, 2016
    Assignee: TOKUYAMA CORPORATION
    Inventors: Shinobu Izumi, Mitsuyoshi Sando, Junji Takenaka, Junji Momoda