Patents by Inventor Kenta Imazato

Kenta Imazato 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: 20210047463
    Abstract: A polycarbonate resin containing a structural unit originating from a dihydroxy compound represented by formula (1), having a boric-acid content of 100 ppm or lower and/or a tertiary-amine content of 1000 ppm by weight or lower, and having a terminal phenyl group originating from a diester carbonate represented by formula (2), wherein the concentration of the terminal phenyl group is equal to or greater than 30 ?eq/g. In formula (1), R1, R2, R3, and R4 each independently represent a hydrogen atom, a C1-C10 alkyl group, a C1-C10 alkoxy group, a C3-C20 cycloalkyl group, a C6-C20 cycloalkoxy group, a C6-C10 aryl group, a C7-C20 aralkyl group, a C6-C10 aryloxy group, a C7-C20 aralkyloxy group, or a halogen atom, and the cyclobutane ring indicates a cis-trans isomer mixture, a cis isomer alone, or a trans isomer alone. In formula (2), R5 and R6 each independently represent a substituted or non-substituted aromatic group.
    Type: Application
    Filed: February 22, 2019
    Publication date: February 18, 2021
    Applicant: TEIJIN LIMITED
    Inventors: Hideyuki TSUNEMORI, Kenta IMAZATO, Takeshi FURUNO, Katsuhiro YAMANAKA
  • Patent number: 10919923
    Abstract: An organic phosphorus-based compound which satisfies the following requirements (i) to (viii) and is represented by the following formula (1): (i) the organic purity should be not lower than 98%; (ii) the solubility in 20° C. water should be not higher than 0.1 g/100 g of water; (iii) the total halogen component content should be not higher than 1,000 ppm; (iv) the total volatile organic matter content should be not higher than 800 ppm; (v) the ? pH value should be not larger than 1.0; (vi) the volume standard median diameter should be not larger than 30 ?m; (vii) the maximum particle diameter should be not larger than 200 ?m; and (viii) the standard deviation represented by the following formula should be not larger than 20 ?m. Standard deviation=(d84%+d16%)/2; wherein d84%: particle diameter at a point where the cumulative curve becomes 84% (?m), and d16%: particle diameter at a point where the cumulative curve becomes 16% (?m).
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: February 16, 2021
    Assignee: TEIJIN LIMITED
    Inventors: Katsuhiro Yamanaka, Kenta Imazato, Naoshi Takahashi
  • Publication number: 20200316928
    Abstract: A multilayer body includes at least one layer (A) made of a polycarbonate resin (A) whose main repeating units include a unit (a-1) composed of an ether diol residue represented by the following formula (1) and a unit (a-2) composed of a diol residue represented by the following formula (2), and at least one layer (B) containing an aromatic polycarbonate resin (B), wherein the molar ratio of the unit (a-1) is 50 to 96 mol % and the molar ratio of the unit (a-2) is 4 to 50 mol %, with respect to 100 mol % of the total repeating units of the polycarbonate resin (A) and the proportion of the aromatic polycarbonate resin (B) in the layer (B) containing an aromatic polycarbonate resin (B) is 30% by weight or more, and the multilayer body is excellent in heat resistance, impact resistance, surface hardness, adhesion, and chemical resistance.
    Type: Application
    Filed: December 12, 2018
    Publication date: October 8, 2020
    Applicant: TEIJIN LIMITED
    Inventors: Tomohiro NAKAZAKI, Kenta IMAZATO, Katsuhiro YAMANAKA
  • Publication number: 20200283571
    Abstract: The present invention provides a polycarbonate copolymer having low specific gravity and high surface hardness.
    Type: Application
    Filed: June 20, 2018
    Publication date: September 10, 2020
    Applicant: TeiJin Limited
    Inventors: Hideyuki TSUNEMORI, Kenta IMAZATO, Katsuhiro YAMANAKA
  • Publication number: 20190352502
    Abstract: A multilayer body includes at least one layer (C) including a resin composition; and at least one layer (D) including a thermoplastic resin, in which the resin composition includes a polycarbonate resin (A) and an acrylic resin (B) in a weight ratio of 40:60 to 99:1, the polycarbonate resin (A) includes, as main repeating units, a unit (a-1) represented by the following formula (a-1): and a unit (a-2) represented by the following formula (a-2): wherein W represents an alkylene group having 1 to 20 carbon atoms or a cycloalkylene group having 6 to 20 carbon atoms, R represents a branched or linear alkyl group having 1 to 20 carbon atoms, or a cycloalkyl group having 6 to 20 carbon atoms and optionally having a substituent, and m represents an integer of 0 to 10, and the molar ratio of the unit (a-1) and the unit (a-2) (a-1/a-2) is 40/60 to 95/5. The multilayer body has excellent transparency, chemical resistance, surface hardness, and adhesion.
    Type: Application
    Filed: January 30, 2018
    Publication date: November 21, 2019
    Applicant: TEIJIN LIMITED
    Inventors: Kenta IMAZATO, Shoichi MAEKAWA, Katsuhiro YAMANAKA
  • Publication number: 20190218237
    Abstract: An organic phosphorus-based compound which satisfies the following requirements (i) to (viii) and is represented by the following formula (1): (i) the organic purity should be not lower than 98%; (ii) the solubility in 20° C. water should be not higher than 0.1 g/100 g of water; (iii) the total halogen component content should be not higher than 1,000 ppm; (iv) the total volatile organic matter content should be not higher than 800 ppm; (v) the ? pH value should be not larger than 1.0; (vi) the volume standard median diameter should be not larger than 30 ?m; (vii) the maximum particle diameter should be not larger than 200 ?m; and (viii) the standard deviation represented by the following formula should be not larger than 20 ?m. Standard deviation=(d84%+d16%)/2; wherein d84%: particle diameter at a point where the cumulative curve becomes 84% (?m), and d16%: particle diameter at a point where the cumulative curve becomes 16% (?m).
    Type: Application
    Filed: March 10, 2017
    Publication date: July 18, 2019
    Applicant: TEIJIN LIMITED
    Inventors: Katsuhiro YAMANAKA, Kenta IMAZATO, Naoshi TAKAHASHI
  • Patent number: 10138355
    Abstract: A flame retardant resin composition containing 1 to 100 parts by weight of (B) an organophosphorus compound (component B) represented by the following formula (1) per 100 parts by weight of (A) a resin component (component A) containing at least 60 wt % of an acrylic resin has high flame retardancy, high transparency and satisfactory physical properties: wherein X1 and X2 are the same or different, and represent alkyl groups substituted with aromatic groups represented by the following formula (2): ALAr)n??(2) wherein AL represents a branched or linear aliphatic hydrocarbon group having 1 to 5 carbon atoms, Ar represents a phenyl group, a naphthyl group, or an anthryl group each optionally substituted, n represents an integer of 1 to 3, and Ar can be bonded to any carbon atom in AL.
    Type: Grant
    Filed: January 19, 2016
    Date of Patent: November 27, 2018
    Assignee: TEIJIN LIMITED
    Inventors: Katsuhiro Yamanaka, Tsuyoshi Takeda, Kenta Imazato
  • Publication number: 20180282540
    Abstract: Provided is a resin composition comprising: a polycarbonate resin (A) containing, as main repeating units, a unit (a-1) represented by the following formula (a-1) and a unit (a-2) represented by the following formula (a-2) (wherein, W represents a C1-20 alkylene group or a C6-20 cycloalkylene group, R represents a branched or linear-chain C1-20 alkyl group or a C6-20 cycloalkyl group optionally substituted, and m represents an integer of 0 to 10) and an acrylic resin (B), and the polycarbonate resin and the acrylic resin are in a weight ratio of 40:60 to 99:1, wherein the resin composition has a single glass transition temperature, which is in the range of 90° C. to 150° C., and the resin composition has excellent transparency, chemical resistance, surface hardness and heat resistance, and has a low photoelastic coefficient.
    Type: Application
    Filed: September 21, 2016
    Publication date: October 4, 2018
    Applicant: TEIJIN LIMITED
    Inventors: Kenta IMAZATO, Shoichi MAEKAWA, Katsuhiro YAMANAKA
  • Patent number: 10035336
    Abstract: Provided is a multilayer body excellent in terms of heat resistance, low water absorbency, shock resistance, surface hardness, and adhesion, including: at least one layer made of a polycarbonate resin (A) whose main repeating units include a unit (a-1) represented by the following formula: and a unit (a-2) represented by the following formula: (wherein R1, R2, R3, and R4 are each a hydrogen atom or a C1-5 monovalent alkyl group), the unit (a-1) and the unit (a-2) being in a molar ratio (a-1/a-2) of 32/68 to 70/30; and at least one layer made of an aromatic polycarbonate resin (B).
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: July 31, 2018
    Assignee: TEIJIN LIMITED
    Inventors: Kenta Imazato, Katsuhiro Yamanaka
  • Publication number: 20180022880
    Abstract: A film having high transparency, weather resistance, moist heat resistance, excellent tensile characteristics, a good hue and high surface hardness. The film comprises: (a) 100 parts by weight of a polycarbonate resin (component a) containing a carbonate unit (A) represented by the following formula (A) and having a specific viscosity measured from a 20° C. methylene chloride solution of 0.2 to 0.5; (b) 0.03 to 2.5 parts by weight of at least one ultraviolet absorbent (component b) selected from the group consisting of an ultraviolet absorbent having a benzotriazole skeleton and an ultraviolet absorbent having a triazine skeleton; (c) 0.0001 to 0.02 part by weight of a coloring agent (component c); and (d) 0.
    Type: Application
    Filed: March 14, 2016
    Publication date: January 25, 2018
    Applicant: TEIJIN LIMITED
    Inventors: Naoshi TAKAHASHI, Tetsuya MOTOYOSHI, Kenta IMAZATO, Toshiyuki SHIMIZU, Shoichi MAEKAWA, Katsuhiro YAMANAKA
  • Publication number: 20180009967
    Abstract: A flame retardant resin composition containing 1 to 100 parts by weight of (B) an organophosphorus compound (component B) represented by the following formula (1) per 100 parts by weight of (A) a resin component (component A) containing at least 60 wt % of an acrylic resin has high flame retardancy, high transparency and satisfactory physical properties: wherein X1 and X2 are the same or different, and represent alkyl groups substituted with aromatic groups represented by the following formula (2): ?AL??Ar?n??(2) wherein AL represents a branched or linear aliphatic hydrocarbon group having 1 to 5 carbon atoms, Ar represents a phenyl group, a naphthyl group, or an anthryl group each optionally substituted, n represents an integer of 1 to 3, and Ar can be bonded to any carbon atom in AL.
    Type: Application
    Filed: January 19, 2016
    Publication date: January 11, 2018
    Applicant: TEIJIN LIMITED
    Inventors: Katsuhiro YAMANAKA, Tsuyoshi TAKEDA, Kenta IMAZATO
  • Publication number: 20170203556
    Abstract: Provided is a multilayer body excellent in terms of heat resistance, low water absorbency, shock resistance, surface hardness, and adhesion, including: at least one layer made of a polycarbonate resin (A) whose main repeating units include a unit (a-1) represented by the following formula: and a unit (a-2) represented by the following formula: (wherein R1, R2, R3, and R4 are each a hydrogen atom or a C1-5 monovalent alkyl group), the unit (a-1) and the unit (a-2) being in a molar ratio (a-1/a-2) of 32/68 to 70/30; and at least one layer made of an aromatic polycarbonate resin (B).
    Type: Application
    Filed: January 29, 2015
    Publication date: July 20, 2017
    Applicant: TEIJIN LIMITED
    Inventors: Kenta IMAZATO, Katsuhiro YAMANAKA
  • Publication number: 20160075823
    Abstract: A molded article such as a resin window or a lamp lens for vehicles which is formed from a polycarbonate and excellent in heat resistance, weather resistance, low water absorption, surface hardness and low-temperature impact properties. The molded article is formed from a polycarbonate which contains a unit (A) represented by the following formula (A) in an amount of 50 mol % or more based on the total of all recurring units and has a maximum impact energy of 20 J or more in a high-speed surface impact test based on ASTM D3763 in a ?20° C. environment and a brittle fracture rate of 50% or less.
    Type: Application
    Filed: February 21, 2014
    Publication date: March 17, 2016
    Inventors: Kenta IMAZATO, Tsuyoshi TAKEDA, Hiroshi OKAMOTO, Tetsuya MOTOYOSHI, Takushi TANI, Katsuhiro YAMANAKA
  • Patent number: 9096710
    Abstract: A polycarbonate resin which is excellent in heat resistance, boiling water resistance and surface hardness and has a low water absorption coefficient. The polycarbonate resin comprises a unit (A) represented by the following formula and a unit (B) represented by the following formula as main recurring units, wherein the molar ratio (A/B) of the unit (A) to the unit (B) is 30/70 to 99/1. In the above formula, X is an alkylene group having 3 to 20 carbon atoms or cycloalkylene group having 3 to 20 carbon atoms, R is an alkyl group having 1 to 20 carbon atoms or cycloalkyl group having 3 to 20 carbon atoms, and “m” is an integer of 1 to 10.
    Type: Grant
    Filed: December 25, 2012
    Date of Patent: August 4, 2015
    Assignee: TEIJIN LIMITD
    Inventors: Tetsuya Motoyoshi, Kenta Imazato, Katsuhiro Yamanaka
  • Publication number: 20150087804
    Abstract: A copolycarbonate having a low water absorption coefficient and excellent heat resistance, low temperature characteristics and surface hardness. The copolycarbonate (Z) of the present invention contains a unit (A) represented by the following formula and a unit (B) represented by the following formula (B) as main recurring units, the (A/Bn=1) molar ratio of the unit (A) and the unit (Bn=1) being 40/60 to 99/1. The unit (Bn=1) is a single unit constituting a block. (R1) is an alkylene group or cycloalkylene group, all of which may be substituted by an aromatic group having 6 to 12 carbon atoms. R2 is an alkylene group, cycloalkylene group or arylene group, all of which may be substituted by an aromatic group having 6 to 12 carbon atoms. “r” and “s” are each independently an integer of 0 to 4 “l” is 0 or 1. “m” is 0 or 1. “n” is an integer of 1 to 100.
    Type: Application
    Filed: April 18, 2013
    Publication date: March 26, 2015
    Inventors: Tetsuya Motoyoshi, Kenta Imazato, Katsuhiro Yamanaka
  • Publication number: 20140350208
    Abstract: A polycarbonate resin which is excellent in heat resistance, boiling water resistance and surface hardness and has a low water absorption coefficient. The polycarbonate resin comprises a unit (A) represented by the following formula and a unit (B) represented by the following formula as main recurring units, wherein the molar ratio (A/B) of the unit (A) to the unit (B) is 30/70 to 99/1. (In the above formula, X is an alkylene group having 3 to 20 carbon atoms or cycloalkylene group having 3 to 20 carbon atoms, R is an alkyl group having 1 to 20 carbon atoms or cycloalkyl group having 3 to 20 carbon atoms, and “m” is an integer of 1 to 10.
    Type: Application
    Filed: December 25, 2012
    Publication date: November 27, 2014
    Inventors: Tetsuya Motoyoshi, Kenta Imazato, Katsuhiro Yamanaka