Patents by Inventor Nobuo Kawato

Nobuo Kawato 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: 20200148856
    Abstract: A polymerizable composition for an optical material according to the present invention includes (A) phosphite triester represented by Formula (1), (D) a photochromic compound, (E) a polyisocyanate compound, and (F) a difunctional or higher functional active hydrogen compound.
    Type: Application
    Filed: July 2, 2018
    Publication date: May 14, 2020
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Yuuki KASORI, Masaru KAWAGUCHI, Nobuo KAWATO
  • Publication number: 20190211258
    Abstract: Provided is a photochromic lens in which a transmittance at 23° C. after irradiation using a xenon lamp at an illuminance of 50,000 lux for 15 minutes satisfies the following conditions. (1) A transmittance at 550 nm is 25% or less. (2) A transmittance a at 550 nm is larger than a minimum transmittance b between 575 nm and 600 nm, and a difference between the transmittance a and the transmittance b is 5% or more. (3) There are one or more points of inflection in a transmittance curve from 550 nm to 600 nm.
    Type: Application
    Filed: September 28, 2017
    Publication date: July 11, 2019
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Nobuo Kawato, Masaru Kawaguchi, Shinichiro Kadowaki, Yuuki Kasori
  • Patent number: 10344116
    Abstract: Provided is a polymerizable composition for an optical material including (A) a bifunctional amine having two secondary amino groups, (B) a bifunctional thiol having two mercapto groups, and (C) a bifunctional isocyanate having two isocyanato groups, in which the ratio ((a+b)/c) of the total molar number (a+b) of the molar number a of amino groups in the amine (A) and the molar number b of mercapto groups in the thiol (B) with respect to the molar number c of isocyanato groups in the isocyanate (C) is in the range of 0.85 to 1.15, and the ratio (a/c) of the molar number a of amino groups in the amine (A) with respect to the molar number c of isocyanato groups in the isocyanate (C) is in the range of 0.10 to 0.60.
    Type: Grant
    Filed: July 7, 2015
    Date of Patent: July 9, 2019
    Assignee: MITSUI CHEMICALS, INC.
    Inventor: Nobuo Kawato
  • Patent number: 10308756
    Abstract: Provided is a polymerizable composition for an optical material including (A) an amine having two or more secondary amino groups, (B) an isocyanate having two or more isocyanato groups, and (C) a thiol having three or more mercapto groups, in which the ratio (a/b) of the molar number a of amino groups in the amine (A) with respect to the molar number b of isocyanato groups in the isocyanate (B) is in the range of 0.10 to 0.60.
    Type: Grant
    Filed: July 7, 2015
    Date of Patent: June 4, 2019
    Assignee: MITSUI CHEMICALS, INC.
    Inventor: Nobuo Kawato
  • Publication number: 20190048122
    Abstract: A polymerizable composition for an optical material according to the present invention includes a polyisocyanate compound (A), a polyol compound (B) having a number average molecular weight of 100 or more, a difunctional or higher functional active hydrogen compound (C) (but, excluding the compound (B)), a photochromic compound (D), and an ultraviolet absorber (E).
    Type: Application
    Filed: September 16, 2016
    Publication date: February 14, 2019
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Yuuki KASORI, Shinichiro KADOWAKI, Nobuo KAWATO
  • Patent number: 10202483
    Abstract: The polymerizable composition of the present invention includes at least one isocyanate compound (A) having a cyclic structure, selected from compounds represented by the following Formulae (1), (2), and (3), and aliphatic isocyanate compound (B) having 4 to 11 carbon atoms, and a thiol compound (C).
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: February 12, 2019
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Naoki Shinohara, Nobuo Kawato, Dong Gyu Jang, Soo Gyun Roh
  • Publication number: 20180341043
    Abstract: A polymerizable composition for an optical material according to the present invention, including: a monomer mixture (A) including a polymerizable monomer having a (meth) acrylic group, a photochromic compound (B) which is at least one selected from compounds represented by Formulae (1) and (2); and an ultraviolet absorbing agent (C) which is at least one selected from compounds represented by Formulae (a) to (c).
    Type: Application
    Filed: September 16, 2016
    Publication date: November 29, 2018
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Masaru KAWAGUCHI, Nobuo KAWATO
  • Patent number: 10131767
    Abstract: The polymerizable composition for an optical material of the present invention contains (A) at least one kind of isocyanate having two or more isocyanato groups, which contains aromatic isocyanate, (B) at least one kind of alcohol having two or more hydroxyl groups, (C) an acidic phosphoric acid ester represented by the following Formula (1), and (D) a benzotriazole-based compound, in which a ratio of secondary hydroxyl groups to the total molar number of primary and secondary hydroxyl groups contained in the alcohol (B) is equal to or greater than 50%, and the benzotriazole-based compound (D) is contained in an amount of 1 part by weight to 11 parts by weight with respect to a total of 100 parts by weight of the isocyanate (A) and the alcohol (B).
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: November 20, 2018
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Shinsuke Ito, Nobuo Kawato, Kouji Suesugi, Shigetoshi Kuma, Tatsuya Ogawa, Toshiya Hashimoto, Mamoru Tanaka
  • Publication number: 20180258212
    Abstract: A molded product according to the present invention is a molded product obtainable by polymerizing and curing a polymerizable composition including: a polyisocyanate compound (A); a polyol compound (B) which is represented by Formula (1) and which has a number average molecular weight of equal to or greater than 100; a bifunctional or higher functional active hydrogen compound (C) (here, excluding the compound (B)); and a photochromic compound (D), in which a concentration of SH groups measured by an IR analysis method is less than 1.0 wt %.
    Type: Application
    Filed: September 16, 2016
    Publication date: September 13, 2018
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Shinichiro KADOWAKI, Yuuki KASORI, Nobuo KAWATO
  • Publication number: 20170226267
    Abstract: The polymerizable composition of the present invention includes at least one isocyanate compound (A) having a cyclic structure, selected from compounds represented by the following Formulae (1), (2), and (3), and aliphatic isocyanate compound (B) having 4 to 11 carbon atoms, and a thiol compound (C).
    Type: Application
    Filed: August 6, 2015
    Publication date: August 10, 2017
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Naoki SHINOHARA, Nobuo KAWATO, Dong Gyu JANG, Soo Gyun ROH
  • Publication number: 20170204217
    Abstract: Provided is a polymerizable composition for an optical material including (A) a bifunctional amine having two secondary amino groups, (B) a bifunctional thiol having two mercapto groups, and (C) a bifunctional isocyanate having two isocyanato groups, in which the ratio ((a+b)/c) of the total molar number (a+b) of the molar number a of amino groups in the amine (A) and the molar number b of mercapto groups in the thiol (B) with respect to the molar number c of isocyanato groups in the isocyanate (C) is in the range of 0.85 to 1.15, and the ratio (a/c) of the molar number a of amino groups in the amine (A) with respect to the molar number c of isocyanato groups in the isocyanate (C) is in the range of 0.10 to 0.60.
    Type: Application
    Filed: July 7, 2015
    Publication date: July 20, 2017
    Applicant: MITSUI CHEMICALS, INC.
    Inventor: Nobuo KAWATO
  • Patent number: 9678246
    Abstract: A polymerizable composition for an optical material includes: (A) one or more isocyanates having two or more isocyanato groups that contains an aromatic isocyanate; (B) one or more alcohols having two or more hydroxyl groups; and (C) an acid phosphate represented by the following formula (1), in which a ratio of the molar number of a secondary hydroxyl group to the total molar number of primary and secondary hydroxyl groups contained in the alcohol (B) is 50% or higher.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: June 13, 2017
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Nobuo Kawato, Tatsuya Ogawa, Toshiya Hashimoto, Mamoru Tanaka, Shigetoshi Kuma
  • Publication number: 20170129989
    Abstract: Provided is a polymerizable composition for an optical material including (A) an amine having two or more secondary amino groups, (B) an isocyanate having two or more isocyanato groups, and (C) a thiol having three or more mercapto groups, in which the ratio (a/b) of the molar number a of amino groups in the amine (A) with respect to the molar number b of isocyanato groups in the isocyanate (B) is in the range of 0.10 to 0.60.
    Type: Application
    Filed: July 7, 2015
    Publication date: May 11, 2017
    Applicant: MITSUI CHEMICALS, INC.
    Inventor: Nobuo KAWATO
  • Patent number: 9482787
    Abstract: The polymerizable composition of the present invention contains a ketone compound including one or more carbonyl groups, at least one kind of isocyanate compounds and at least one kind of thiol compounds.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: November 1, 2016
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Nobuo Kawato, Toshiya Hashimoto, Koya Kojima
  • Patent number: 9464154
    Abstract: A process for producing a polyurethane resin of the present invention includes a step (i) of obtaining a prepolymer by adding an alcohol (B) to isocyanate (A) such that a ratio of hydroxyl groups to isocyanato groups of the isocyanate (A) falls into a range of 10 mol % to 20 mol % and reacting the isocyanate (A) with the alcohol (B) in the presence of an acidic phosphoric acid ester (C) and a hindered amine-based compound (D), a step (ii) of obtaining a polymerizable composition in a manner in which the alcohol (B) is further added to and mixed with the prepolymer at a temperature of equal to or less than 30° C., and a step (iii) of polymerizing the prepolymer and the alcohol (B) contained in the polymerizable composition. The isocyanate (A) contains an aromatic isocyanate and the alcohol (B) has two or more hydroxyl groups and is further defined.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: October 11, 2016
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Nobuo Kawato, Tatsuya Ogawa, Toshiya Hashimoto, Mamoru Tanaka, Shigetoshi Kuma
  • Publication number: 20160272784
    Abstract: The polymerizable composition for an optical material of the present invention contains (A) at least one kind of isocyanate having two or more isocyanato groups, which contains aromatic isocyanate, (B) at least one kind of alcohol having two or more hydroxyl groups, (C) an acidic phosphoric acid ester represented by the following Formula (1), and (D) a benzotriazole-based compound, in which a ratio of secondary hydroxyl groups to the total molar number of primary and secondary hydroxyl groups contained in the alcohol (B) is equal to or greater than 50%, and the benzotriazole-based compound (D) is contained in an amount of 1 part by weight to 11 parts by weight with respect to a total of 100 parts by weight of the isocyanate (A) and the alcohol (B).
    Type: Application
    Filed: March 26, 2014
    Publication date: September 22, 2016
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Shinsuke ITO, Nobuo KAWATO, Kouji SUESUGI, Shigetoshi KUMA, Tatsuya OGAWA, Toshiya HASHIMOTO, Mamoru TANAKA
  • Patent number: 9290656
    Abstract: A polymerizable composition for polythiourethane optical materials comprising a compound represented by the general formula (1), M(L)n??(1) wherein, in the formula, M is Al, Fe, Cu, Zn, Zr or Bi; L is a dithiocarbamic acid group, a sulfonic acid group, a mono- or di-alkyl phosphoric acid ester group, a substituted acetylacetonato group or a halogen; and n is an integer of 1 to 5, one or two or more isocyanates selected from the group consisting of isocyanate compounds and isothiocyanate compounds, and one or two or more active hydrogen compounds each having a mercapto group. The compounds represented by the general formula (1) exhibit catalytic activity equal to or superior to that of organotin catalysts having been employed as catalysts for the production of polythiourethane optical materials from the past, and have high safety. Further, the thus obtained polythiourethane resins satisfactorily meet the property requirements for optical materials, in particular, excelling in weather resistance.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: March 22, 2016
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Hidetoshi Hayashi, Nobuo Kawato, Masanori Iwazumi, Mamoru Tanaka, Seiichi Kobayashi
  • Publication number: 20150315327
    Abstract: A process for producing a polyurethane resin of the present invention includes a step (i) of obtaining a prepolymer by adding an alcohol (B) to isocyanate (A) such that a ratio of hydroxyl groups to isocyanato groups of the isocyanate (A) falls into a range of 10 mol % to 20 mol % and reacting the isocyanate (A) with the alcohol (B) in the presence of an acidic phosphoric acid ester (C) and a hindered amine-based compound (D), a step (ii) of obtaining a polymerizable composition in a manner in which the alcohol (B) is further added to and mixed with the prepolymer at a temperature of equal to or less than 30° C., and a step (iii) of polymerizing the prepolymer and the alcohol (B) contained in the polymerizable composition. The isocyanate (A) contains an aromatic isocyanate and the alcohol (B) has two or more hydroxyl groups and is further defined.
    Type: Application
    Filed: November 1, 2013
    Publication date: November 5, 2015
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Nobuo KAWATO, Tatsuya OGAWA, Toshiya HASHIMOTO, Mamoru TANAKA, Shigetoshi KUMA
  • Publication number: 20150293265
    Abstract: A polymerizable composition for an optical material includes: (A) one or more isocyanates having two or more isocyanato groups that contains an aromatic isocyanate; (B) one or more alcohols having two or more hydroxyl groups; and (C) an acid phosphate represented by the following formula (1), in which a ratio of the molar number of a secondary hydroxyl group to the total molar number of primary and secondary hydroxyl groups contained in the alcohol (B) is 50% or higher.
    Type: Application
    Filed: November 1, 2013
    Publication date: October 15, 2015
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Nobuo Kawato, Tatsuya Ogawa, Toshiya Hashimoto, Mamoru Tanaka, Shigetoshi Kuma
  • Publication number: 20140107314
    Abstract: The polymerizable composition of the present invention contains a ketone compound including one or more carbonyl groups, at least one kind of isocyanate compounds and at least one kind of thiol compounds.
    Type: Application
    Filed: June 19, 2012
    Publication date: April 17, 2014
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Nobuo Kawato, Toshiya Hashimoto, Koya Kojima