Patents Assigned to Sakai Chemical Industry Co. Ltd.
  • Patent number: 10696563
    Abstract: It is one of objects of the present disclosure to provide hexagonal plate-shaped zinc oxide particles which can be used suitably for a cosmetic, a filler, a resin composition, an infrared radiation reflective material, and a coating composition, and a method for producing the same. Hexagonal plate-shaped zinc oxide particles having a primary particle diameter of 1.1 ?m or more and a D90/D10 of 3.0 or less in particle size distribution.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: June 30, 2020
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Ryohei Yoshida, Satoru Sueda, Mitsuo Hashimoto, Mizuho Wada
  • Patent number: 10227239
    Abstract: It is an object of the present disclosure to provide a method for inexpensively producing a high-performance barium sulfate powder which is obtained by using inexpensive barium sulfide as a raw material, has a high whiteness degree, and can suppress the generation of volatile components. A method for producing a barium sulfate powder comprises a step of heat treating a raw barium sulfate powders obtained by using barium sulfide as a raw material at 600 to 1300° C., wherein a retention time X (minutes) at a heat treatment temperature of t° C. is more than time expressed by the following general formula: X (minutes)=A×106×e(?0.015×t), where A is 8 or more, and an upper limit of X is 3000 minutes in the formula.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: March 12, 2019
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventor: Masayuki Asada
  • Publication number: 20190040233
    Abstract: The invention provides an acetylacetone metal salt having on the surface a coating formed of a hydrocarbon wax having substantially no acid value, wherein the acetylacetone metal salt is at least one selected from the group consisting of calcium salt, magnesium salt and zinc salt.
    Type: Application
    Filed: February 23, 2017
    Publication date: February 7, 2019
    Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Koichi TSUDA, Yasuhiro TAI
  • Patent number: 10080713
    Abstract: The invention provides surface-treated spherical calcium carbonate particles for use in cosmetics which comprise spherical calcium carbonate particles having a volume mean diameter in a range of 0.5 to 20 ?m, and having on their surfaces a hydrous silica coating, and further a silicone oil coating on the hydrous silica coating. The surface-treated spherical calcium carbonate particles for use in cosmetics are obtained by forming a hydrous silica coating on the surfaces of spherical calcium carbonate particles, and then by forming a silicone oil coating on the surfaces of the hydrous silica coating of the particles.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: September 25, 2018
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Hiroyuki Izumikawa, Seiji Sakamoto, Takeshi Nishimura
  • Patent number: 10047239
    Abstract: The invention provides an organic solvent dispersion of titanium oxide particles in a content of 10% by weight or more in an organic solvent except methanol and ethanol, wherein the titanium oxide particles are surface-treated with a surface treating agent comprising a silane coupling agent having the general formula (I) (RO)n—Si—X4-n??(I) wherein R is an alkyl group having carbon atoms of 1-4, n is 2 or 3, X is an alkyl, a fluoroalkyl, a vinyl or a (meth)acryloyloxyalkyl group, and 12-hydroxystearic acid, and wherein the titanium oxide particles in the organic solvent have a D50 in a range of 1 to 30 nm, and wherein the organic solvent dispersion has a transmittance of 2% or more at a wavelength of 500 nm and a transmittance of 70% or more at a wavelength of 800 nm, a viscosity of 10 mPa·s or less at a temperature of 25° C. immediately after production while the increase in the viscosity is 40 mPa·s or less seven days after production as compared to that of the dispersion immediately after production.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: August 14, 2018
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takanori Morita, Atsushi Miyata, Kasumi Onishi
  • Patent number: 10035132
    Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on their surfaces either a coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, or an inner coat layer of an oxide of at least one element selected from silicon, aluminum and zirconium or a composite oxide of at least two elements selected from silicon, aluminum and zirconium in an amount of from 1 to 20 parts by weight per 100 parts by weight of the solid base and an outer coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, and wherein the solid base is hydrotalcite.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: July 31, 2018
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Toshikatsu Umaba, Hiromitsu Shimizu, Kenji Mori, Keiichi Tabata
  • Patent number: 9981248
    Abstract: The invention provides a polycondensation catalyst for producing polyester by an esterification reaction or a transesterification reaction between a dicarboxylic acid or ester-forming derivative thereof and a glycol, wherein the polycondensation catalyst comprises particles of a solid base having on their surfaces either a coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base, or an inner coat layer of an oxide of at least one element selected from silicon, aluminum and zirconium or a composite oxide of at least two elements selected from silicon, aluminum and zirconium in an amount of from 1 to 20 parts by weight per 100 parts by weight of the solid base and an outer coat layer of titanic acid in an amount of from 0.1 to 50 parts by weight in terms of TiO2 per 100 parts by weight of the solid base.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: May 29, 2018
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Toshikatsu Umaba, Hiromitsu Shimizu, Kenji Mori, Keiichi Tabata
  • Patent number: 9976036
    Abstract: The invention provides an organic solvent dispersion of zirconium oxide particles in a content of 20% by weight or more in an organic solvent except methanol and ethanol.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: May 22, 2018
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takanori Morita, Atsushi Miyata, Kasumi Onishi
  • Patent number: 9963355
    Abstract: The invention provides a method for producing an organic solvent dispersion of titanium oxide particles in an organic solvent except methanol and ethanol, comprising: (a) a surface treating process for surface treating an alcohol dispersion of titanium oxide particles in at least one alcohol solvent selected from the group consisting of methanol and ethanol with a surface treating agent comprising a silane coupling agent and 12-hydroxystearic acid thereby surface treating the titanium oxide particles; and (b) a solvent replacing process for replacing the alcohol solvent that is a dispersion medium of the alcohol dispersion of titanium oxide particles by the organic solvent except methanol and ethanol, wherein the silane coupling agent has the general formula (I) (RO)n—Si—X4-n??(I) wherein R is an alkyl group having carbon atoms of 1-4, n is 2 or 3, X is an alkyl, a fluoroalkyl, a vinyl or a (meth)acryloyloxyalkyl group.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: May 8, 2018
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takanori Morita, Atsushi Miyata, Kasumi Onishi
  • Patent number: 9937114
    Abstract: An object of the present disclosure is to investigate fluorescent substance being safe and having a high color developing property, and obtain an inorganic red fluorescent substance consisting of an element which exerts no bad influence upon human bodies. A cosmetic containing inorganic particles consisting of a compound represented by a general formula: MgxTiyO(x+2y+2z):Mn4+z wherein 1.5<x<2.5, 0.5<y?1.5, and 0.0001<z<0.1.
    Type: Grant
    Filed: July 3, 2015
    Date of Patent: April 10, 2018
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Emi Sako, Keita Kobayashi
  • Publication number: 20180029897
    Abstract: The invention provides a method for producing an organic solvent dispersion of titanium oxide particles in an organic solvent except methanol and ethanol, comprising: (a) a surface treating process for surface treating an alcohol dispersion of titanium oxide particles in at least one alcohol solvent selected from the group consisting of methanol and ethanol with a surface treating agent comprising a silane coupling agent and 12-hydroxystearic acid thereby surface treating the titanium oxide particles; and (b) a solvent replacing process for replacing the alcohol solvent that is a dispersion medium of the alcohol dispersion of titanium oxide particles by the organic solvent except methanol and ethanol, wherein the silane coupling agent has the general formula (I) (RO)n—Si—X4-n??(I) wherein R is an alkyl group having carbon atoms of 1-4, n is 2 or 3, X is an alkyl, a fluoroalkyl, a vinyl or a (meth)acryloyloxyalkyl group.
    Type: Application
    Filed: February 23, 2016
    Publication date: February 1, 2018
    Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takanori MORITA, Atsushi MIYATA, Kasumi ONISHI
  • Publication number: 20180030305
    Abstract: The invention provides an organic solvent dispersion of titanium oxide particles in a content of 10% by weight or more in an organic solvent except methanol and ethanol, wherein the titanium oxide particles are surface-treated with a surface treating agent comprising a silane coupling agent having the general formula (I) (RO)n—Si—X4-n ??(I) wherein R is an alkyl group having carbon atoms of 1-4, n is 2 or 3, X is an alkyl, a fluoroalkyl, a vinyl or a (meth)acryloyloxyalkyl group, and 12-hydroxystearic acid, and wherein the titanium oxide particles in the organic solvent have a D50 in a range of 1 to 30 nm, and wherein the organic solvent dispersion has a transmittance of 2% or more at a wavelength of 500 nm and a transmittance of 70% or more at a wavelength of 800 nm, a viscosity of 10 mPa·s or less at a temperature of 25° C. immediately after production while the increase in the viscosity is 40 mPa·s or less seven days after production as compared to that of the dispersion immediately after production.
    Type: Application
    Filed: February 23, 2016
    Publication date: February 1, 2018
    Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takanori MORITA, Atsushi MIYATA, Kasumi ONISHI
  • Publication number: 20180009672
    Abstract: The invention provides a method for producing an aqueous dispersion of titanium oxide particles which comprises: (a) first step for subjecting an aqueous slurry of titanium oxide particles to wet dispersing treatment in the presence of 15 to 250 parts by mole of acetic acid and 15 to 90 parts by mole of nitric acid each relative to 100 parts by mole of titanium oxide with a medium agitating mill or a high pressure dispersing machine to obtaining an aqueous dispersion of titanium oxide particles before washing, and (b) a second step for washing the aqueous dispersion of titanium oxide particles before washing obtained in the first step (a) to obtain an aqueous dispersion of titanium oxide particles. The invention further provides a method for producing an alcohol dispersion of titanium oxide particles which comprises: (c) a third step for replacing the dispersion medium of the aqueous dispersion of titanium oxide particles obtained in the second step by an alcohol solvent.
    Type: Application
    Filed: February 23, 2016
    Publication date: January 11, 2018
    Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventor: Takanori MORITA
  • Patent number: 9856146
    Abstract: An object of the present invention is to provide magnesium oxide particles that have a high heat conductivity and excellent properties as heat-dissipating filler, and can prevent problems such as soft errors in the memory. The magnesium oxide particles have a BET specific surface area of 0.1 to 17 m2/g, and an ? dose of 0.005 c/cm2·Hr or lower, the particles exhibiting a relation between an X-ray diffraction peak intensity y (cps) at a Bragg angle (2?) of 42.80° to 43.00° and the BET specific surface area x (m2/g) as represented by the following inequality (1): y??960x+33000??(1).
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: January 2, 2018
    Assignee: Sakai Chemical Industry Co., Ltd.
    Inventors: Satoshi Komori, Harunobu Saito, Takumi Kawada
  • Publication number: 20170306161
    Abstract: The invention provides an organic solvent dispersion of zirconium oxide particles in a content of 20% by weight or more in an organic solvent except methanol and ethanol.
    Type: Application
    Filed: August 28, 2015
    Publication date: October 26, 2017
    Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Takanori MORITA, Atsushi MIYATA, Kasumi ONISHI
  • Patent number: 9789037
    Abstract: It is one of the objects of the present disclosure to provide hexagonal plate-shaped zinc oxide particles having suitable performances derived from the shape thereof, that is, zinc oxide particles having improved ultraviolet shielding ratio at the wavelength of 400 nm or less without impairing the direct transition properties of electronic excitation thereof and having remarkably improved ultraviolet shielding ratio for UV-B radiation and UV-A radiation. A zinc oxide particle containing a solid solution of a Ti element and/or a Fe element and a Zn element in at least a portion thereof, and having a hexagonal plate shape.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: October 17, 2017
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Satoru Sueda, Mitsuo Hashimoto, Mizuho Wada
  • Patent number: 9775787
    Abstract: It is one of the objects of the present disclosure to provide hexagonal prism-shaped zinc oxide particles having improved ultraviolet shielding ratio at the wavelength of 400 nm or less without impairing the direct transition properties of electronic excitation thereof and having remarkably improved ultraviolet shielding ratio for UV-B radiation and UV-A radiation; and a zinc oxide particle containing a solid solution of a Ti element and/or a Fe element and a Zn element in at least a portion thereof, and having a hexagonal prism shape.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: October 3, 2017
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Satoru Sueda, Mitsuo Hashimoto, Mizuho Wada
  • Patent number: 9771274
    Abstract: The invention provides a method for producing barium titanate powder comprising the steps of: adding an aqueous slurry of anatase hydrous titanium oxide having a BET specific surface area in the range of 200 m2/g to 400 m2/g and a half width of diffraction peak of (101) plane in the range of 2.3° to 5.0° as measured by X-ray diffraction to an aqueous solution of barium hydroxide while maintaining the aqueous solution of barium hydroxide at a temperature in the range from 80° C. to the boiling point thereof under normal pressure to cause a reaction of the barium hydroxide with the hydrous titanium oxide to provide an aqueous slurry of barium titanate precursor; and subjecting the barium titanate precursor thus obtained to hydrothermal treatment over a period of not less than 24 hours to provide barium titanate particles.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: September 26, 2017
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Kazumi Yamanaka, Yuji Baba, Minoru Yoneda, Yukihiro Kuniyoshi, Shinji Ogama
  • Patent number: 9751776
    Abstract: The invention provides a dispersion of zirconium oxide having a content as high as 20% by weight or more, but a low viscosity, and having a high transparency, which has a transmittance of 35% or more at a wave length of 400 nm, a transmittance of 95% or more at a wave length of 800 nm, and a viscosity of 20 mPa·s or less at a temperature of 25° C. Such a dispersion of zirconium oxide can be obtained by reacting a zirconium salt with an alkali in water to obtain a slurry of particles of zirconium oxide; filtering, washing, and repulping the slurry; adding an organic acid to the resulting slurry in an amount of one mole part or more per mole part of the zirconium in the slurry; hydrothermally treating the slurry at a temperature of 170° C. or higher; and washing and concentrating the resulting aqueous dispersion of particles of zirconium oxide.
    Type: Grant
    Filed: November 26, 2009
    Date of Patent: September 5, 2017
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Kenichi Nakagawa, Takanori Morita
  • Patent number: 9695061
    Abstract: The invention provides a method for producing barium titanate powder comprising the steps of: adding an aqueous slurry of anatase hydrous titanium oxide having a BET specific surface area in the range of 200 to 400 m2/g and a half width of diffraction peak of (101) plane in the range of 2.3° to 5.0° as measured by X-ray diffraction to an aqueous solution of barium hydroxide while maintaining the aqueous solution of barium hydroxide at a temperature in the range from 80° C. to the boiling point thereof under normal pressure to cause a reaction of the barium hydroxide with the hydrous titanium oxide to provide an aqueous slurry of barium titanate precursor; and subjecting the barium titanate precursor thus obtained to hydrothermal treatment over a period of time shorter than 24 hours to provide barium titanate particles.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: July 4, 2017
    Assignee: SAKAI CHEMICAL INDUSTRY CO., LTD.
    Inventors: Kazumi Yamanaka, Yuji Baba, Minoru Yoneda, Yukihiro Kuniyoshi, Shinji Ogama