Patents by Inventor Yasushi Buzojima

Yasushi Buzojima 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: 11891551
    Abstract: A double-sided pressure-sensitive adhesive tape having excellent impact resistance, excellent reworkability, and excellent alcohol resistance. The double-sided pressure-sensitive adhesive tape includes: a base material layer; and pressure-sensitive adhesive layers arranged on both surface sides of the base material layer, wherein the pressure-sensitive adhesive layers are each formed from a pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive composition contains at least one kind selected from the group consisting of a monomer component (m) and a polymer component (P) obtained by polymerizing the monomer component (m), wherein the monomer component (m) contains 50 wt % or more of butyl (meth)acrylate, wherein a ratio of a thickness of the base material layer to a total thickness of the double-sided pressure-sensitive adhesive tape is less than 35%, and wherein the double-sided pressure-sensitive adhesive tape has a force, which is generated at 100% strain at 23° C.
    Type: Grant
    Filed: October 14, 2020
    Date of Patent: February 6, 2024
    Assignee: NITTO DENKO CORPORATION
    Inventors: Takuya Fujita, Hiromichi Sumida, Masahito Niwa, Masataka Nishiwaki, Yasushi Buzojima
  • Publication number: 20230295468
    Abstract: Provided is a novel PSA sheet having good impact resistance as well as an increased refractive index. The present invention provides an adhesively double-faced PSA sheet that consists of a PSA layer and is free of a substrate. The PSA sheet has a refractive index of 1.50 or higher as well as a breaking strength of 10 MPa or less.
    Type: Application
    Filed: January 25, 2021
    Publication date: September 21, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Masataka NISHIWAKI, Kazuki MINOURA, Yasushi BUZOJIMA
  • Publication number: 20230212434
    Abstract: The present invention relates to a pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer containing a base polymer and a pigment, wherein the light transmittance in the wavelength range of 380 to 500 nm is 25% or less and the light transmittance in the wavelength range of 800 to 2,500 nm is 60% or more.
    Type: Application
    Filed: March 17, 2021
    Publication date: July 6, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazuki MINOURA, Masataka NISHIWAKI, Yasushi BUZOJIMA
  • Publication number: 20230132107
    Abstract: The present invention relates to a pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer containing a base polymer and a pigment, wherein the light transmittance in the wavelength range of 380 to 500 nm is 25% or less, the light transmittance in the wavelength range of 800 to 2,500 nm is 60% or more, L* defined by the L*a*b* color space is or less, a* is ?10 or more and 40 or less, and b* is ?20 or more and 30 or less.
    Type: Application
    Filed: March 17, 2021
    Publication date: April 27, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazuki MINOURA, Masataka NISHIWAKI, Yasushi BUZOJIMA
  • Publication number: 20230132305
    Abstract: The present invention relates to a pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer containing a base polymer and a pigment, the pressure-sensitive adhesive sheet having a transmittance for light having wavelengths of 380-600 nm of 25% or less, transmittance for light having wavelengths 800-2,500 nm of 60% or greater, and a change in light transmittance in the wavelength range of 600 to 800 nm of 0.1%/nm or greater.
    Type: Application
    Filed: March 17, 2021
    Publication date: April 27, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Masataka NISHIWAKI, Kazuki MINOURA, Yasushi BUZOJIMA
  • Publication number: 20230128453
    Abstract: To provide a PSA sheet having excellent IR-blocking properties. Provided is a PSA sheet having a substrate layer as well as a PSA layer placed on one face of the substrate layer. The PSA sheet has 5% or lower light transmittance in the thickness direction in a wavelength region of 780 nm to 2500 nm.
    Type: Application
    Filed: March 15, 2021
    Publication date: April 27, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazuki MINOURA, Masataka NISHIWAKI, Yasushi BUZOJIMA
  • Publication number: 20230121495
    Abstract: The PSA sheet provided by this invention has a PSA layer. The PSA layer comprises particles PHRI. The particles PHRI present in the PSA layer has a mean particle diameter of less than 100 nm and a standard deviation of 20 nm or less. Here, the mean particle diameter and the standard deviation are determined from a number-based particle distribution by TEM analysis.
    Type: Application
    Filed: January 25, 2021
    Publication date: April 20, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Masataka NISHIWAKI, Kazuki MINOURA, Yasushi BUZOJIMA
  • Publication number: 20230087412
    Abstract: Provided is a novel pressure-sensitive adhesive sheet that is capable of having good light-blocking properties while having an increased refractive index. The pressure-sensitive adhesive sheet provided by the present invention has a pressure-sensitive adhesive layer comprising a black colorant. The pressure-sensitive adhesive sheet has a refractive index of 1.50 or higher.
    Type: Application
    Filed: January 25, 2021
    Publication date: March 23, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Masataka NISHIWAKI, Kazuki MINOURA, Yasushi BUZOJIMA
  • Publication number: 20230077929
    Abstract: Provided is a PSA sheet having limited light transmission, increased refractive indices for IR light and VIS light with less wavelength dependence of refractive index and good adhesive properties. The PSA sheet provided by this invention has a PSA layer. The PSA sheet has a total light transmittance below 80%. The PSA layer has a first face and a second face on the opposite side to the first face. The PSA layer comprises high-refractive-index particles. The high-refractive-index particles are concentrated in the first face side of the PSA layer. On the first face, the difference between the refractive index nVIS at 500 nm wavelength and the refractive index nIR at 940 nm wavelength is less than 0.03.
    Type: Application
    Filed: February 1, 2021
    Publication date: March 16, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Masataka NISHIWAKI, Kazuki MINOURA, Yasushi BUZOJIMA
  • Publication number: 20230079556
    Abstract: Provided is a novel PSA sheet having limited light transmission and an increased refractive index. The PSA sheet provided by the present invention has a PSA layer. The PSA sheet has a total light transmittance of 80% or lower as well as a refractive index of 1.50 or higher.
    Type: Application
    Filed: January 25, 2021
    Publication date: March 16, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Masataka NISHIWAKI, Kazuki MINOURA, Yasushi BUZOJIMA
  • Publication number: 20230070327
    Abstract: Provided is a PSA sheet having limited light transmission, an increased refractive index and good adhesive properties. The PSA sheet provided by this invention has a PSA layer. The PSA sheet has a total light transmittance below 80%. The PSA layer has a first face and a second face on the opposite side to the first face. The PSA layer comprises high-refractive-index particles. In the PSA layer, the high-refractive-index particles are concentrated in a range that extends from the first face towards the second face side and has a thickness of at least 100 nm, accounting for less than 50% of the PSA layer thickness.
    Type: Application
    Filed: February 1, 2021
    Publication date: March 9, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Masataka NISHIWAKI, Kazuki MINOURA, Yasushi BUZOJIMA
  • Patent number: 11512232
    Abstract: The invention provides a PSA sheet having a PSA layer exhibiting superior light shielding. Provided is a PSA sheet comprising a PSA layer that includes a PSA polymer. Carbon black particles are dispersed in the PSA layer. The average particle size of the carbon black particles dispersed in the PSA layer is 300 nm or smaller. The average particle size is an average particle size determined on the basis of a number-based particle size distribution by TEM observation.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: November 29, 2022
    Assignee: NITTO DENKO CORPORATION
    Inventors: Ryo Morioka, Masataka Nishiwaki, Toshiki Ikami, Yasushi Buzojima
  • Patent number: 11168236
    Abstract: The present invention provides an acrylic PSA composition. The acrylic PSA composition comprises an acrylic polymer as its base polymer and at least one species selected among tackifier resins and (meth)acrylic oligomers. The acrylic polymer has a weight average molecular weight higher than 70×104. The acrylic polymer has a dispersity (Mw/Mn) below 15.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: November 9, 2021
    Assignee: NITTO DENKO CORPORATION
    Inventors: Kenta Jozuka, Naoaki Higuchi, Kenji Furuta, Naohiro Kato, Yasushi Buzojima
  • Publication number: 20210189190
    Abstract: A double-sided pressure-sensitive adhesive tape having excellent impact resistance, excellent reworkability, and excellent alcohol resistance. The double-sided pressure-sensitive adhesive tape includes: a base material layer; and pressure-sensitive adhesive layers arranged on both surface sides of the base material layer, wherein the pressure-sensitive adhesive layers are each formed from a pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive composition contains at least one kind selected from the group consisting of a monomer component (m) and a polymer component (P) obtained by polymerizing the monomer component (m), wherein the monomer component (m) contains 50 wt % or more of butyl (meth)acrylate, wherein a ratio of a thickness of the base material layer to a total thickness of the double-sided pressure-sensitive adhesive tape is less than 35%, and wherein the double-sided pressure-sensitive adhesive tape has a force, which is generated at 100% strain at 23° C.
    Type: Application
    Filed: October 14, 2020
    Publication date: June 24, 2021
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takuya FUJITA, Hiromichi Sumida, Masahito Niwa, Masataka Nishiwaki, Yasushi Buzojima
  • Publication number: 20210163795
    Abstract: A pressure-sensitive adhesive sheet includes a substrate layer, and a pressure-sensitive adhesive layer disposed on or over at least one side of the substrate layer. The substrate layer includes a metal layer having a thickness of 10 to 80 ?m. The pressure-sensitive adhesive sheet has a total thickness of 100 ?m or less, and has an electric field shielding effect of 20 dB or more and a magnetic field shielding effect of 5 dB or more as measured by the KEC method at a frequency of 100 kHz to 1000 kHz. The pressure-sensitive adhesive sheet is used for securing an internal component of a portable electronic device.
    Type: Application
    Filed: November 12, 2020
    Publication date: June 3, 2021
    Applicant: NITTO DENKO CORPORATION
    Inventors: Toshiki IKAMI, Shigeki WATANABE, Yasushi BUZOJIMA, Naohiro KATO
  • Publication number: 20210032503
    Abstract: Provided is a double-sided pressure-sensitive adhesive tape that can express excellent impact resistance. The double-sided pressure-sensitive adhesive tape is a double-sided pressure-sensitive adhesive tape for use in fixing a member to be included in a mobile device, the double-sided pressure-sensitive adhesive tape including a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition, and wherein the pressure-sensitive adhesive composition contains an organic hollow filler.
    Type: Application
    Filed: July 6, 2020
    Publication date: February 4, 2021
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takuya FUJITA, Naohiro KATO, Masahito NIWA, Yasushi BUZOJIMA
  • Patent number: 10800943
    Abstract: Provided is a pressure-sensitive adhesive (PSA) sheet having a low relative dielectric constant, satisfactory metal corrosion preventing property, and excellent member holding performance. The present invention provides a PSA sheet having a PSA layer including a base polymer and a rust inhibitor. The base polymer is an acrylic polymer, and monomeric components constituting the acrylic polymer comprise a (meth)acrylate having an alkyl group having 5 or more carbon atoms at an ester end at 50% by weight or more of the monomeric components. The PSA layer has a relative dielectric constant of 3 or less at 300 kHz.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: October 13, 2020
    Assignee: NITTO DENKO CORPORATION
    Inventors: Hiroki Kigami, Yasushi Buzojima, Kenta Jozuka, Midori Segawa
  • Patent number: 10800944
    Abstract: Provided is a pressure-sensitive adhesive (PSA) sheet including a PSA layer formed from a PSA composition including a base polymer, crosslinking agents of two or more species having mutually different types of crosslinkable functional groups, and an azole-based rust inhibitor. Here, one of the crosslinking agents of two or more species is an isocyanate-based crosslinking agent. Monomeric components constituting the base polymer include a carboxy group-containing monomer. The amount of the azole-based rust inhibitor in the PSA layer is less than 8 parts by weight with respect to 100 parts by weight of the base polymer.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: October 13, 2020
    Assignee: NITTO DENKO CORPORATION
    Inventors: Hiroki Kigami, Yasushi Buzojima, Kenta Jozuka, Midori Segawa, Masataka Nishiwaki, Ryo Morioka
  • Publication number: 20200255701
    Abstract: Provided is a double-sided pressure-sensitive adhesive tape that can express both of excellent impact resistance and excellent oil resistance. The double-sided pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer laminate obtained by laminating “n” or more pressure-sensitive adhesive layers, wherein “n” represents an integer of 2 or more, wherein each of the pressure-sensitive adhesive layers is formed from a pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive composition contains at least one kind selected from the group consisting of a monomer component (m) and a polymer component (P) obtained by polymerizing the monomer component (m), and wherein the monomer component (m) contains 50 wt % or more of butyl acrylate.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 13, 2020
    Applicant: NITTO DENKO CORPORATION
    Inventors: Naohiro KATO, Masahito Niwa, Yasushi Buzojima, Naoaki Higuchi, Masataka Nishiwaki
  • Publication number: 20200254734
    Abstract: Provided is a double-sided pressure-sensitive adhesive tape that can express excellent impact resistance. The double-sided pressure-sensitive adhesive tape of the present invention includes a pressure-sensitive adhesive layer laminate obtained by laminating “n” or more pressure-sensitive adhesive layers, wherein “n” represents an integer of 2 or more, wherein each of the pressure-sensitive adhesive layers is formed from a pressure-sensitive adhesive composition, and wherein the pressure-sensitive adhesive composition contains a low-polarity filler.
    Type: Application
    Filed: January 3, 2020
    Publication date: August 13, 2020
    Applicant: Nitto Denko Corporation
    Inventors: Takuya Fujita, Naohiro Kato, Masahito Niwa, Yasushi Buzojima