Patents by Inventor Kouichi Umemoto

Kouichi Umemoto 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: 11046834
    Abstract: To provide a surface-modified nanodiamond including an N-substituted or unsubstituted amino group having excellent reactivity with other compounds; and having excellent dispersibility in dispersion media and resins. The surface-modified nanodiamond according to the present invention is a surface-modified nanodiamond including a surface-modifying group on a surface of a nanodiamond particle, wherein the surface-modifying group includes a group represented by Formula (1) below, wherein reference signs in Formula (1) below are as described in the present specification.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: June 29, 2021
    Assignee: DAICEL CORPORATION
    Inventor: Kouichi Umemoto
  • Patent number: 10988607
    Abstract: A resin composition (X), which is a curable resin composition according to the present invention, contains a curable resin component (10), a surface-modified nanodiamond (20), and an organic medium. The surface-modified nanodiamond (20) includes a ND particle (21), which is a nanodiamond particle, and a silane coupling agent (22). The silane coupling agent (22) has a (meth)acryloyl-containing organic chain and is bonded to the ND particle (21). The resin composition (X) is suitable for forming a nanodiamond-dispersed cured resin portion having both high transparency and high scratch resistance. An optical element according to the present invention has a light-transmitting region and includes a cured resin portion, which is a cured product of the resin composition (X), in at least part of the light-transmitting region. The optical element is advantageous for actually providing an optical element including a cured resin portion or cured resin layer having both high transparency and high scratch resistance.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: April 27, 2021
    Assignee: DAICEL CORPORATION
    Inventors: Kouichi Umemoto, Takahiro Sakakibara
  • Publication number: 20210114882
    Abstract: A nanodiamond particle dispersion including nanodiamond particles highly dispersed in an organic solvent is provided. A nanodiamond particle dispersion of the present invention includes nanodiamond particles dispersed in an organic solvent, in which the nanodiamond particles have a silane compound (excluding a silane compound having a (meth)acryloyl group) bonded to a surface of the nanodiamond particles, the organic solvent has an SP value from 8.0 to 14.0 (cal/cm3)1/2, and the nanodiamond particles are dispersed with a particle diameter (D50) from 2 to 100 nm. The organic solvent is preferably at least one type of organic solvent selected from ketones, ethers, alcohols, and carbonates.
    Type: Application
    Filed: January 15, 2019
    Publication date: April 22, 2021
    Applicant: DAICEL CORPORATION
    Inventors: Kouichi UMEMOTO, Hidekazu TAKEUCHI
  • Publication number: 20210087702
    Abstract: Provided is a plating film that can exhibit a high gloss and a low contact resistance value. The plating film according to an embodiment of the present invention is a plating film including a noble metal matrix and nanodiamond particles dispersed in the noble metal matrix. The plating film according to an embodiment of the present invention preferably has a gloss at an incident angle of 60° of not less than 250 GU and/or a contact resistance value at a load of 50 gf of not greater than 1 m?, and a difference between a contact resistance value at a load of 50 gf and a contact resistance value at a load of 5 gf of not greater than 5 m?. The nanodiamond particles are preferably nanodiamond particles including a surface-modifying group containing a sterically repulsive group and particularly preferably nanodiamond particles including a surface-modifying group containing a polyglycerol chain.
    Type: Application
    Filed: January 28, 2019
    Publication date: March 25, 2021
    Applicant: DAICEL CORPORATION
    Inventors: Norihiro KIMOTO, Tomohiro GOTO, Kouichi UMEMOTO
  • Publication number: 20200282712
    Abstract: An anti-reflection film (X) of the present invention includes a laminated structure including a substrate (11), a hard coat layer (12), and an anti-reflection layer (13). The anti-reflection layer (13) contains a curable resin, low-refractive-index particles, and nanodiamond particles. The anti-reflection layer (13) may further contain a fluorine-containing curable compound. Such an anti-reflection film is suitable for achieving high scratch resistance together with high anti-reflective properties.
    Type: Application
    Filed: August 6, 2018
    Publication date: September 10, 2020
    Applicant: DAICEL CORPORATION
    Inventors: Takahiro SAKAKIBARA, Kouichi UMEMOTO, Ryouta KOJIMA, Hiroki KAGEYAMA
  • Publication number: 20200189916
    Abstract: The present invention is to provide a surface-modified nanodiamond having excellent affinity for an organic solvent and a resin and having high dispersibility in an organic solvent and in a resin. The surface-modified nanodiamond according to an embodiment of the present invention has a structure in which a surface of a nanodiamond particle is modified by a group represented by Formula (1) below. In Formula (1), R1 represents an aliphatic hydrocarbon group having 6 or more carbons. R2 and R3 may be the same or different and are each a hydrogen atom, an aliphatic hydrocarbon group having from 1 to 3 carbons, or a group represented by Formula (2) below.
    Type: Application
    Filed: June 6, 2018
    Publication date: June 18, 2020
    Applicant: DAICEL CORPORATION
    Inventor: Kouichi UMEMOTO
  • Publication number: 20200192001
    Abstract: An anti-reflection film (X) of the present invention includes a laminated structure including a substrate (11), a hard coat layer (12), and an anti-reflection layer (13), and a luminous reflectance of the anti-reflection layer (13) side is 2% or less. The anti-reflection layer (13) includes a surface (13a) having a coefficient of kinetic friction of 0.3 or less and a coefficient of static friction of 0.3 or less. In addition, in the anti-reflection film (X), after a rubbing test performed on the surface (13a) using steel wool #0000 as a rubbing material under conditions of a load of 200 g/cm2, a rubbing stroke length of 10 cm, and reciprocations of 1000 times, a difference of the haze value (%) after the rubbing test from the haze value (%) before the rubbing test is 0.1 or less. Such an anti-reflection film is suitable for achieving high scratch resistance together with high anti-reflective properties.
    Type: Application
    Filed: August 6, 2018
    Publication date: June 18, 2020
    Applicant: DAICEL CORPORATION
    Inventors: Takahiro SAKAKIBARA, Kouichi UMEMOTO, Ryouta KOJIMA, Hiroki KAGEYAMA
  • Publication number: 20200017661
    Abstract: To provide a surface-modified nanodiamond including an N-substituted or unsubstituted amino group having excellent reactivity with other compounds; and having excellent dispersibility in dispersion media and resins. The surface-modified nanodiamond according to the present invention is a surface-modified nanodiamond including a surface-modifying group on a surface of a nanodiamond particle, wherein the surface-modifying group includes a group represented by Formula (1) below, wherein reference signs in Formula (1) below are as described in the present specification.
    Type: Application
    Filed: April 3, 2018
    Publication date: January 16, 2020
    Applicant: DAICEL CORPORATION
    Inventor: Kouichi UMEMOTO
  • Publication number: 20190031874
    Abstract: A resin composition (X), which is a curable resin composition according to the present invention, contains a curable resin component (10), a surface-modified nanodiamond (20), and an organic medium. The surface-modified nanodiamond (20) includes a ND particle (21), which is a nanodiamond particle, and a silane coupling agent (22). The silane coupling agent (22) has a (meth)acryloyl-containing organic chain and is bonded to the ND particle (21). The resin composition (X) is suitable for forming a nanodiamond-dispersed cured resin portion having both high transparency and high scratch resistance. An optical element according to the present invention has a light-transmitting region and includes a cured resin portion, which is a cured product of the resin composition (X), in at least part of the light-transmitting region. The optical element is advantageous for actually providing an optical element including a cured resin portion or cured resin layer having both high transparency and high scratch resistance.
    Type: Application
    Filed: February 22, 2017
    Publication date: January 31, 2019
    Applicant: DAICEL CORPORATION
    Inventors: Kouichi UMEMOTO, Takahiro SAKAKIBARA
  • Patent number: 10072108
    Abstract: Provided is a film, sheet, plate, or other such formed article having excellent transparency made of a copolymer obtained from a cyclic olefin monomer and an ?-olefin monomer. The present invention provides a formed article made from a copolymer having Tg of 170° C. or higher and an Al content of 50 ppm or less that is a copolymer including a structural unit of a cyclic olefin monomer (A) derived from norbornene and a structural unit of a monomer (B) derived from at least one C4-C12 ?-olefin.
    Type: Grant
    Filed: April 20, 2015
    Date of Patent: September 11, 2018
    Assignee: Daicel Corporation
    Inventors: Takayuki Yaegashi, Keiichi Osano, Yoshimichi Okano, Kouichi Umemoto, Takeshi Yagi
  • Publication number: 20170190815
    Abstract: Provided is a film, sheet, plate, or other such formed article having excellent transparency made of a copolymer obtained from a cyclic olefin monomer and an ?-olefin monomer. The present invention provides a formed article made from a copolymer having Tg of 170° C. or higher and an Al content of 50 ppm or less that is a copolymer including a structural unit of a cyclic olefin monomer (A) derived from norbornene and a structural unit of a monomer (B) derived from at least one C4-C12 ?-olefin.
    Type: Application
    Filed: April 20, 2015
    Publication date: July 6, 2017
    Inventors: Takayuki YAEGASHI, Keiichi OSANO, Yoshimichi OKANO, Kouichi UMEMOTO, Takeshi YAGI
  • Patent number: 6455666
    Abstract: A polyester is a polycondensation product of (i) a diol component and (ii) a dicarboxylic acid component. In this polyester, the diol component (i) includes a tricyclo[3.3.1.13,7]decanediol of following Formula (1): wherein n is 0 or a positive integer, and carbon atoms constituting a ring may each have a substituent, or the dicarboxylic acid component (ii) includes a tricyclo[3.3.1.13,7]decanedicarboxylic acid of following Formula (2): wherein m is 0 or a positive integer, and carbon atoms constituting a ring may each have a substituent. The polyester has high heat resistance, low water absorbency, excellent optical characteristics and satisfactory moldability.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: September 24, 2002
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Tadashi Teranishi, Shougang He, Kouichi Umemoto
  • Publication number: 20020042496
    Abstract: A polyester is a polycondensation product of (i) a diol component and (ii) a dicarboxylic acid component. In this polyester, the diol component (i) includes a tricyclo[3.3.1.
    Type: Application
    Filed: October 11, 2001
    Publication date: April 11, 2002
    Inventors: Tadashi Teranishi, Shougang He, Kouichi Umemoto