Patents by Inventor Yoichi IGAWA

Yoichi IGAWA 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).

  • Vinyl polymer microparticles, and masterbatch and resin film containing the same
    Patent number: 11421126
    Abstract: Provided are vinyl polymer microparticle which can reduce an average volume of the microparticles dropping off from a film surface while reducing the friction of the film. The vinyl polymer microparticles satisfy the following (1) to (3): (1) a coefficient of variation of particle sizes is 30% or more on a volume basis; (2) a proportion of vinyl polymer microparticles having a particle size of 1.7 times or more and 2.5 times or less a volume average particle size is 0.040% or less on a number basis; and (3) a volume average particle size is 3.7 ?m or more.
    Type: Grant
    Filed: April 18, 2019
    Date of Patent: August 23, 2022
    Assignee: NIPPON SHOKUBAI CO., LTD.
    Inventors: Ryo Nakamura, Yasutaka Nakatani, Yoichi Igawa, Erina Hanai
  • VINYL POLYMER MICROPARTICLES, AND MASTERBATCH AND RESIN FILM CONTAINING THE SAME
    Publication number: 20190322782
    Abstract: Provided are vinyl polymer microparticle which can reduce an average volume of the microparticles dropping off from a film surface while reducing the friction of the film. The vinyl polymer microparticles satisfy the following (1) to (3): (1) a coefficient of variation of particle sizes is 30% or more on a volume basis; (2) a proportion of vinyl polymer microparticles having a particle size of 1.7 times or more and 2.5 times or less a volume average particle size is 0.040% or less on a number basis; and (3) a volume average particle size is 3.7 ?m or more.
    Type: Application
    Filed: April 18, 2019
    Publication date: October 24, 2019
    Applicant: NIPPON SHOKUBAI CO., LTD.
    Inventors: Ryo NAKAMURA, Yasutaka NAKATANI, Yoichi IGAWA, Erina HANAI