Patents Assigned to Shiraishi Kogyo Kaisha, Ltd.
  • Patent number: 11939448
    Abstract: A light reflecting body includes a base containing a resin material and a calcium carbonate and includes a metal layer on the surface of the base. The resin material is selected from a polyester resin composition, a polyarylate resin composition, and a mixed resin composition thereof. The calcium carbonate has a BET specific surface area of 1 to 15 m2/g, a pore distribution curve determined by mercury porosimetry that the top of a peak representing interparticle void size is in a pore size range of 0.1 to 1.0 ?m, a particle size distribution determined by using an electron microscope that the proportion of particles having a particle size of 0.1 ?m or less is 10% or less of the calcium carbonate, and the residue on a sieve having a mesh size of 45 ?m after wet sieving of the calcium carbonate is 0.1% or less.
    Type: Grant
    Filed: May 14, 2021
    Date of Patent: March 26, 2024
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Kenichiro Eguchi, Yutaka Minamino
  • Publication number: 20230271845
    Abstract: To produce a calcium carbonate in a controlled form while carbon dioxide gas is efficiently used. A method for producing a calcium carbonate comprises a carbon dioxide gas absorption step of allowing an aqueous sodium hydroxide solution at a concentration of 5 to 21% to absorb carbon dioxide gas to give an aqueous sodium carbonate solution at a concentration of 4 to 24%; a hydration step of reacting calcium oxide with an aqueous sodium hydroxide solution at a concentration of 0 to less than 6% to give a lime milk that is a suspension of calcium hydroxide having a BET specific surface area of 5 to 40 m2/g; and a carbonation step of adding the aqueous sodium carbonate solution to the lime milk and performing reaction.
    Type: Application
    Filed: December 24, 2021
    Publication date: August 31, 2023
    Applicant: Shiraishi Kogyo Kaisha, Ltd.
    Inventors: Hiromitsu Sakaguchi, Sayaka Oguni, Kenichiro Eguchi, Toru Oda, Yasunori Nanri
  • Patent number: 11702530
    Abstract: Provided is a surface-treated calcium carbonate that can make a vinyl chloride-based resin composition less colorable in a weathering test and excellent in impact strength. The surface-treated calcium carbonate is a calcium carbonate subjected to treatment with a surface treatment agent in which a proportion of saturated fatty acid contained in a fatty acid is 85% by mass or more, and has a content of elemental iron of 0.01% by mass or less, a content of elemental zinc of 0.1 to 2% by mass introduced by the treatment with the surface treatment agent, and a BET specific surface area of 5 to 30 m2/g.
    Type: Grant
    Filed: May 20, 2020
    Date of Patent: July 18, 2023
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Yutaka Minamino, Kenichiro Eguchi, Yoshisada Kayano
  • Publication number: 20220220283
    Abstract: Provided is a surface-treated calcium carbonate that can make a vinyl chloride-based resin composition less colorable in a weathering test and excellent in impact strength. The surface-treated calcium carbonate is a calcium carbonate subjected to treatment with a surface treatment agent in which a proportion of saturated fatty acid contained in a fatty acid is 85% by mass or more, and has a content of elemental iron of 0.01% by mass or less, a content of elemental zinc of 0.1 to 2% by mass introduced by the treatment with the surface treatment agent, and a BET specific surface area of 5 to 30 m2/g.
    Type: Application
    Filed: May 20, 2020
    Publication date: July 14, 2022
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Yutaka Minamino, Kenichiro Eguchi, Yoshisada Kayano
  • Patent number: 11384220
    Abstract: Provided is a white resin composition that can maintain a high degree of whiteness even after undergoing a thermal resistance test. A white resin composition contains: a white pigment; a surface-treated calcium carbonate in which particle surfaces of a synthetic calcium carbonate with an average particle diameter of 0.05 to 1 ?m are subjected to surface treatment with a condensed phosphoric acid and an organic modified silicone oil; and a resin, wherein a content ratio between the white pigment and the surface-treated calcium carbonate is, in mass ratio (white pigment to surface-treated calcium carbonate), within a range of 90:10 to 60:40, and a total content of the white pigment and the surface-treated calcium carbonate in the resin composition is within a range of 5 to 70% mass.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: July 12, 2022
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Kenichiro Eguchi, Yutaka Minamino, Masahiro Matsui
  • Publication number: 20220089440
    Abstract: An object is to provide a particle that has properties to seal dentinal tubules, and that exhibits excellent adhesion in dentinal tubules. The object is achieved by a fine hydroxyapatite particle that has a ratio of the diffraction peak intensity around 2?=32° to the diffraction peak intensity around 2?=26° of 0.8 to 1.6 in an X-ray diffraction pattern as measured by using CuK? radiation, and that is an aggregate of particles.
    Type: Application
    Filed: December 27, 2019
    Publication date: March 24, 2022
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Kohei KISHI, Shota UMEMOTO
  • Publication number: 20210355295
    Abstract: A light reflecting body includes a base containing a resin material and a calcium carbonate and includes a metal layer on the surface of the base. The resin material is selected from a polyester resin composition, a polyarylate resin composition, and a mixed resin composition thereof. The calcium carbonate has a BET specific surface area of 1 to 15 m2/g, a pore distribution curve determined by mercury porosimetry that the top of a peak representing interparticle void size is in a pore size range of 0.1 to 1.0 ?m, a particle size distribution determined by using an electron microscope that the proportion of particles having a particle size of 0.1 ?m or less is 10% or less of the calcium carbonate, and the residue on a sieve having a mesh size of 45 ?m after wet sieving of the calcium carbonate is 0.1% or less.
    Type: Application
    Filed: May 14, 2021
    Publication date: November 18, 2021
    Applicant: Shiraishi Kogyo Kaisha, Ltd.
    Inventors: Kenichiro Eguchi, Yutaka Minamino
  • Patent number: 11167998
    Abstract: Provided are a calcium carbonate having a small particle diameter and easily dispersible in polymers and a production method therefor. A calcium carbonate has a magnesium content of 12000 to 120000 ppm, a BET specific surface area of 60 to 120 m2/g, and a crystallite size of (104) plane of 20 to 50 nm, and particles of the calcium carbonate are concatenated.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: November 9, 2021
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Maya Yoshida, Kenichiro Eguchi
  • Patent number: 11066538
    Abstract: A vinyl chloride-vinyl acetate copolymer resin composition which is excellent in storage stability and can reduce the baking temperature is provided. The vinyl chloride-vinyl acetate copolymer resin composition comprises: 70 to 300 parts by mass of surface-treated calcium carbonate obtained by surface-treating calcium carbonate with a fatty acid or a derivative thereof based on 100 parts by mass of a vinyl chloride-vinyl acetate copolymer resin having a vinyl acetate content of 8 to 12% by mass, and it is characterized in that a BET specific surface area of the surface-treated calcium carbonate is 10 to 40 m2/g, and an amount of the calcium carbonate surface-treated is 0.1×10?2 g/m2 to 0.4×10?2 g/m2 per m2/g of the BET specific surface area of the surface-treated calcium carbonate.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: July 20, 2021
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Hiroshi Saito, Nobuyoshi Murakami, Kanehiro Osakabe, Yoshisada Kayano
  • Publication number: 20210155492
    Abstract: Calcium carbonate and a calcium carbonate preparation for food addition use which hardly sediment and are excellent in dispersibility when they are added to foods such as beverages, and which can impart good springiness to fish paste products when they are added to such products; and a food are provided. The calcium carbonate is characterized by having a BET specific surface area in the range of 20 to 45 m2/g, and a volume of voids having a void size of 0.1 ?m or less of 30% or more of the whole volume of voids in a pore size distribution curve (0.01 to 10 ?m) by mercury porosimetry.
    Type: Application
    Filed: July 23, 2018
    Publication date: May 27, 2021
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Shinsuke Nakai, Yoshiki Kuma, Yukari Tanaka, Ryo Chiba
  • Patent number: 10995200
    Abstract: Provided are a kaolin clay for a thermoplastic resin composition that can provide high impact strength and glossiness and a thermoplastic resin composition containing the same. A kaolin clay for a thermoplastic resin composition is subjected to a surface treatment with 0.2 to 10 parts by mass of at least one selected from the group consisting of methyl silicate, ethyl silicate, propyl silicate, and butyl silicate relative to 100 parts by mass of the kaolin clay.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: May 4, 2021
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Kenichiro Eguchi, Yutaka Minamino, Ruriko Nakagawa, Kosuke Kawai, Masahiro Matsui
  • Patent number: 10883952
    Abstract: A method for calculating the dielectric constant of particle-dispersed composite materials that enables an easy evaluation of dispersibility. The composite material is assumed as a cell combination 10 in which unit cells 1 having a length a are combined together in an x-axis, a y-axis, and a z-axis direction and which has a length 1 in the x-axis direction, a length m in the y-axis direction, and a length n in the z-axis direction, the cell combination 10 is created in which a particle element or a medium element is assigned to each of the unit cells 1 Layers have a thickness d in the z-axis direction are combined and layered in the z-axis direction and assigning a capacitance CLayer,h of each of the layers represented by Formula 1 below to Formula 2 to determine a relative dielectric constant ?Total.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: January 5, 2021
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Jusuke Hidaka, Kizuku Kushimoto
  • Publication number: 20200102443
    Abstract: A vinyl chloride-vinyl acetate copolymer resin composition which is excellent in storage stability and can reduce the baking temperature is provided. The vinyl chloride-vinyl acetate copolymer resin composition comprises: 70 to 300 parts by mass of surface-treated calcium carbonate obtained by surface-treating calcium carbonate with a fatty acid or a derivative thereof based on 100 parts by mass of a vinyl chloride-vinyl acetate copolymer resin having a vinyl acetate content of 8 to 12% by mass, and it is characterized in that a BET specific surface area of the surface-treated calcium carbonate is 10 to 40 m2/g, and an amount of the calcium carbonate surface-treated is 0.1×10?2 g/m2 to 0.4×10?2 g/m2 per m2/g of the BET specific surface area of the surface-treated calcium carbonate.
    Type: Application
    Filed: March 12, 2018
    Publication date: April 2, 2020
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Hiroshi Saito, Nobuyoshi Murakami, Kanehiro Osakabe, Yoshisada Kayano
  • Publication number: 20200062608
    Abstract: Provided are a calcium carbonate having a small particle diameter and easily dispersible in polymers and a production method therefor. A calcium carbonate has a magnesium content of 12000 to 120000 ppm, a BET specific surface area of 60 to 120 m2/g, and a crystallite size of (104) plane of 20 to 50 nm, and particles of the calcium carbonate are concatenated.
    Type: Application
    Filed: February 23, 2018
    Publication date: February 27, 2020
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Maya Yoshida, Kenichiro Eguchi
  • Publication number: 20200040158
    Abstract: Provided is a white resin composition that can maintain a high degree of whiteness even after undergoing a thermal resistance test. A white resin composition contains: a white pigment; a surface-treated calcium carbonate in which particle surfaces of a synthetic calcium carbonate with an average particle diameter of 0.05 to 1 ?m are subjected to surface treatment with a condensed phosphoric acid and an organic modified silicone oil; and a resin, wherein a content ratio between the white pigment and the surface-treated calcium carbonate is, in mass ratio (white pigment to surface-treated calcium carbonate), within a range of 90:10 to 60:40, and a total content of the white pigment and the surface-treated calcium carbonate in the resin composition is within a range of 5 to 70% mass.
    Type: Application
    Filed: October 17, 2016
    Publication date: February 6, 2020
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Kenichiro Eguchi, Yutaka Minamino, Masahiro Matsui
  • Patent number: 10422763
    Abstract: A method for measuring the relative dielectric constant of powder in a powder-dispersed composite material. A composite material is assumed as a cell combination in which unit cells having the same length a in each of an x-axis direction, a y-axis direction, and a z-axis direction are combined together and which has a length l in the x-axis direction, a length m in the y-axis direction, and a length n in the z-axis direction, each of the unit cells of the cell combination is considered to be constituted by a single powder element or a single medium element, the cell combination is created in which the powder element or the medium element is assigned to each of the unit cells in consideration of the number-based median particle diameter D50, the maximum diameter Dmax, the minimum diameter Dmin, and the geometric standard deviation ?g.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: September 24, 2019
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Jusuke Hidaka, Kizuku Kushimoto
  • Publication number: 20190177512
    Abstract: Provided are a kaolin clay for a thermoplastic resin composition that can provide high impact strength and glossiness and a thermoplastic resin composition containing the same. A kaolin clay for a thermoplastic resin composition is subjected to a surface treatment with 0.2 to 10 parts by mass of at least one selected from the group consisting of methyl silicate, ethyl silicate, propyl silicate, and butyl silicate relative to 100 parts by mass of the kaolin clay.
    Type: Application
    Filed: May 31, 2017
    Publication date: June 13, 2019
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Kenichiro Eguchi, Yutaka Minamino, Ruriko Nakagawa, Kosuke Kawai, Masahiro Matsui
  • Patent number: 10227441
    Abstract: There are provided a silyl-terminated resin composition and a method for producing the same, the silyl-terminated resin composition being superior in storage stability before curing and providing a cured product which has a low initial modulus and can maintain the low modulus even after a heat-accelerated test. The silyl-terminated resin composition comprises a surface-treated calcium carbonate and a silyl-terminated resin, wherein the surface-treated calcium carbonate is obtained by surface-treating calcium carbonate having a BET specific surface area in the range of 1 m2/g to 60 m2/g with a fatty acid, and has an alkali metal content in the range of 500 ?g/g to 2000 ?g/g and the free fatty acid as determined by ethanol extraction in the range of 1.8 to 2.5% by mass.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: March 12, 2019
    Assignee: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Kanehiro Osakabe, Yoshisada Kayano
  • Publication number: 20180370190
    Abstract: Provided is a light reflector that can achieve high light intensity. The light reflector includes a base material made of a polyester resin composition and a light reflection layer provided on the base material, wherein the polyester resin composition contains calcium carbonate having an average particle diameter of 0.1 to 0.3 ?m.
    Type: Application
    Filed: November 28, 2016
    Publication date: December 27, 2018
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Kenichiro EGUCHI, Yutaka MINAMINO
  • Publication number: 20180292343
    Abstract: A method for calculating the dielectric constant of particle-dispersed composite materials that enables an easy evaluation of dispersibility. The composite material is assumed as a cell combination 10 in which unit cells 1 having a length a are combined together in an x-axis, a y-axis, and a z-axis direction and which has a length 1 in the x-axis direction, a length m in the y-axis direction, and a length n in the z-axis direction, the cell combination 10 is created in which a particle element or a medium element is assigned to each of the unit cells 1 Layers have a thickness d in the z-axis direction are combined and layered in the z-axis direction and assigning a capacitance CLayer,h of each of the layers represented by Formula 1 below to Formula 2 to determine a relative dielectric constant ?Total.
    Type: Application
    Filed: October 12, 2016
    Publication date: October 11, 2018
    Applicant: SHIRAISHI KOGYO KAISHA, LTD.
    Inventors: Jusuke Hidaka, Kizuku Kushimoto