Patents by Inventor Mayumi Tokuoka

Mayumi Tokuoka 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: 11976199
    Abstract: There is provided a novel halogenated zinc phthalocyanine pigment for a color filter, which can form a green color filter having excellent contrast and high luminance. A halogenated zinc phthalocyanine pigment for a color filter shows, in a Raman spectrum, a peak intensity of 3.0% or more at 716±2.2 cm?1 when a peak intensity at 650±10 cm?1 is regarded as 100%.
    Type: Grant
    Filed: April 28, 2020
    Date of Patent: May 7, 2024
    Assignee: DIC CORPORATION
    Inventors: Keisuke Sakamoto, Kentaro Oishi, Ryousuke Asami, Mayumi Tokuoka, Katsunori Shimada, Keisuke Fujisawa
  • Publication number: 20230287218
    Abstract: The halogenated zinc phthalocyanine pigment is for use as a green pigment for color filters and capable of achieving high brightness. In the halogenated zinc phthalocyanine pigment, when a coating film containing 1.00 part by mass of the pigment, 0.95 parts by mass of a benzyl methacrylate-methacrylic acid copolymer, and 0.30 parts by mass of a dimethylaminoethyl methacrylate copolymer is heated at 230° C. for one hour to form an evaluation coating film having a thickness of 4 ?m, an average scattering intensity at scattering angles 2? in a range of 17° to 21° is determined from a two-dimensional scattering image obtained by GI-WAXS measurement of the evaluation coating film, and a normalized average scattering intensity is determined such that the average scattering intensity at an azimuth of 45° is 1, the normalized average scattering intensity at azimuths of 5° to 89° is 0.70 to 1.15.
    Type: Application
    Filed: June 3, 2021
    Publication date: September 14, 2023
    Applicant: DIC Corporation
    Inventors: Keisuke Sakamoto, Yuji Tamura, Kentaro Oishi, Yuta Hidaka, Takeshi Yamada, Ryousuke Asami, Kengo Yasui, Mayumi Tokuoka, Katsunori Shimada
  • Publication number: 20230144572
    Abstract: A method for producing a halogenated zinc phthalocyanine pigment includes a step of forming a halogenated zinc phthalocyanine crude pigment into a pigment. The halogenated zinc phthalocyanine crude pigment is obtained by deposition of a halogenated zinc phthalocyanine, which is synthesized by using a compound that generates an acid by reacting with water, and the step includes a pretreatment step of heating the halogenated zinc phthalocyanine crude pigment in water to obtain a halogenated zinc phthalocyanine prepigment having a pH of 5.0 or more.
    Type: Application
    Filed: April 30, 2020
    Publication date: May 11, 2023
    Applicant: DIC Corporation
    Inventors: Keisuke Sakamoto, Kentaro Oishi, Ryousuke Asami, Mayumi Tokuoka, Katsunori Shimada
  • Publication number: 20230147608
    Abstract: A method for producing a halogenated zinc phthalocyanine pigment according to one embodiment includes a first step of obtaining a halogenated zinc phthalocyanine crude pigment by deposition by extracting a halogenated zinc phthalocyanine, which is synthesized by using a compound that generates an acid by reacting with water; and a second step of forming the halogenated zinc phthalocyanine crude pigment into a pigment.
    Type: Application
    Filed: April 30, 2020
    Publication date: May 11, 2023
    Applicant: DIC Corporation
    Inventors: Keisuke Sakamoto, Ayaka Yamaji, Kazushi Suzuki, Mayumi Tokuoka, Katsunori Shimada
  • Publication number: 20230147454
    Abstract: A method for producing a halogenated zinc phthalocyanine pigment includes a step of forming a halogenated zinc phthalocyanine crude pigment into a pigment. The halogenated zinc phthalocyanine crude pigment is obtained by depositing a halogenated zinc phthalocyanine, which is synthesized by using a compound that generates an acid by reacting with water, and the aforementioned step includes a pretreatment step of dry-crushing the halogenated zinc phthalocyanine crude pigment by using an attritor and then washing the dry-crushed halogenated zinc phthalocyanine crude pigment with water.
    Type: Application
    Filed: April 30, 2020
    Publication date: May 11, 2023
    Applicant: DIC Corporation
    Inventors: Keisuke Sakamoto, Ayaka Yamaji, Nozomi Shimizu, Mayumi Tokuoka, Katsunori Shimada
  • Publication number: 20230141091
    Abstract: A method for producing a halogenated zinc phthalocyanine pigment includes a step of forming a halogenated zinc phthalocyanine crude pigment into a pigment. The halogenated zinc phthalocyanine crude pigment is obtained by depositing a halogenated zinc phthalocyanine, which is synthesized by using an acidic compound or a compound that generates an acid by reacting with water, and the step includes a pretreatment step of kneading the halogenated zinc phthalocyanine crude pigment along with water.
    Type: Application
    Filed: April 30, 2020
    Publication date: May 11, 2023
    Applicant: DIC Corporation
    Inventors: Keisuke Sakamoto, Ayaka Yamaji, Kazushi Suzuki, Mayumi Tokuoka, Katsunori Shimada
  • Publication number: 20220002550
    Abstract: There is provided a novel halogenated zinc phthalocyanine pigment for a color filter, which can form a green color filter having excellent contrast and high luminance. A halogenated zinc phthalocyanine pigment for a color filter shows, in a Raman spectrum, a peak intensity of 3.0% or more at 716±2.2 cm?1 when a peak intensity at 650±10 cm?1 is regarded as 100%.
    Type: Application
    Filed: April 28, 2020
    Publication date: January 6, 2022
    Applicant: DIC Corporation
    Inventors: Keisuke Sakamoto, Kentaro Oishi, Ryousuke Asami, Mayumi Tokuoka, Katsunori Shimada, Keisuke Fujisawa
  • Patent number: 9908991
    Abstract: An organic pigment composition that allows a colored item to have good color saturation and high resistance to a change in hue even when subjected to a thermal history for a prolonged period. A color filter includes an organic pigment composition for color filters in a pixel portion. The organic pigment composition for color filters includes an organic pigment (A) having an average primary particle size of 100 nm or less; and a copolymer (B) of a (meth)acrylic acid ester having a phosphate group and another (meth)acrylic acid ester having no phosphate group, the amount of a nonvolatile component of the copolymer (B) being 0.1 to 15 parts relative to 100 parts of the organic pigment (A) on a mass basis.
    Type: Grant
    Filed: May 16, 2013
    Date of Patent: March 6, 2018
    Assignee: DIC CORPORATION
    Inventors: Masanori Fujimaki, Mayumi Tokuoka, Akira Kimura, Katsunori Shimada, Kayoko Fukushima, Masaharu Takahashi
  • Publication number: 20150315361
    Abstract: Provided is an organic pigment composition that allows a colored item to have good color saturation and high resistance to a change in hue even when subjected to a thermal history for a prolonged period. A color filter includes an organic pigment composition for color filters in a pixel portion. The organic pigment composition for color filters includes an organic pigment (A) having an average primary particle size of 100 nm or less; and a copolymer (B) of a (meth)acrylic acid ester having a phosphate group and another (meth)acrylic acid ester having no phosphate group, the amount of a nonvolatile component of the copolymer (B) being 0.1 to 15 parts relative to 100 parts of the organic pigment (A) on a mass basis.
    Type: Application
    Filed: May 16, 2013
    Publication date: November 5, 2015
    Applicant: DIC CORPORATION
    Inventors: Masanori Fujimaki, Mayumi Tokuoka, Akira Kimura, Katsunori Shimada, Kayoko Fukushima, Masaharu Takahashi