Patents by Inventor Kohei Takeda

Kohei Takeda 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).

  • Publication number: 20140050874
    Abstract: Provided is a pressure-sensitive adhesive sheet formed of at least two layers, including a rubber-based pressure-sensitive adhesive layer (A) and an acrylic pressure-sensitive adhesive layer (B) that are directly laminated, in which the pressure-sensitive adhesive sheet has a large interlayer peel strength. The pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet formed of at least two layers, including a rubber-based pressure-sensitive adhesive layer (A) and an acrylic pressure-sensitive adhesive layer (B) that are directly laminated, in which the pressure-sensitive adhesive sheet has an interlayer peel strength upon peeling of the acrylic pressure-sensitive adhesive layer (B) from the rubber-based pressure-sensitive adhesive layer (A) under conditions of a measurement temperature of 23° C., a tension speed of 0.3 m/min, and a peel angle of 180° C. of 2.0 N/20 mm or more.
    Type: Application
    Filed: April 3, 2012
    Publication date: February 20, 2014
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kohei Takeda, Shinsuke Ikishima, Yuuki Katou
  • Patent number: 8563362
    Abstract: A method for producing a semiconductor chip laminate, which comprises applying an adhesive to a substrate or other semiconductor chip; laminating the semiconductor chip on the substrate or other semiconductor chip via the adhesive; uniformly wetting and spreading the adhesive on an entire region for bonding the semiconductor chip on the substrate or other semiconductor chip; and curing the adhesive. In the application step, an area for applying adhesive is 40% to 90% of the region for bonding the semiconductor chip located on the substrate or other semiconductor chip, immediately after laminating, an area with the adhesive thereon is 60% to less than 100% of the region for bonding the semiconductor chip on the substrate or other semiconductor chip, and in wetting and spreading the adhesive, a viscosity of adhesive between the substrate or other semiconductor chips and the semiconductor chip at 0.5 rpm is 1 Pas to 30 Pas.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: October 22, 2013
    Assignee: Sekisui Chemical Co., Ltd.
    Inventors: Akinobu Hayakawa, Hideaki Ishizawa, Kohei Takeda, Ryohei Masui
  • Publication number: 20120021233
    Abstract: It is an object of the present invention to provide a method for producing a semiconductor chip laminate, which adjusts the amount of an adhesive for semiconductor components extending from a bonded region of a semiconductor chip and provides a smaller but highly-precise and highly-reliable semiconductor chip laminate.
    Type: Application
    Filed: March 10, 2010
    Publication date: January 26, 2012
    Applicant: Sekisui Chemical Co., Ltd.
    Inventors: Akinobu Hayakawa, Hideaki Ishizawa, Kohei Takeda, Ryohei Masui
  • Publication number: 20120016057
    Abstract: It is an object of the present invention to provide an adhesive for electronic components that prevents warpage of electronic components and reflow cracks even in the case of bonding thin electronic components. The present invention relates to an adhesive for electronic components, comprising: an epoxy compound having an aliphatic polyether backbone and a glycidyl ether group; an epoxy group-containing acrylic polymer; an episulfide compound; and a curing agent, wherein the amount of the episulfide compound is 1 parts by weight or more, and less than 30 parts by weight relative to 100 parts by weight of the epoxy compound having an aliphatic polyether backbone and a glycidyl ether group.
    Type: Application
    Filed: January 29, 2010
    Publication date: January 19, 2012
    Inventors: Akinobu Hayakawa, Hideaki Ishizawa, Kohei Takeda, Ryohei Masui
  • Patent number: 7838577
    Abstract: The present invention has its object to provide an adhesive for electronic components, excellent in coatability, having high preventability of stains in bonded electronic components, and capable of providing highly reliable electronic components. The present invention relates to a liquid adhesive for electronic components, containing: a curable compound; a curing agent; and inorganic fine particles, a liquid portion in the liquid adhesive having a solubility parameter (SP value) in the range of 8 to 11 (including 8 and not including 11), the inorganic fine particles including a mixture of at least inorganic fine particles (A) and inorganic fine particles (B), the inorganic fine particles (A) having an average primary particle diameter of 50 nm or less and a hydrophobization degree (M value) in the range of 30 to 50 (including 30 and 50), and the inorganic fine particles (B) having an average primary particle diameter of 50 nm or less and a hydrophobization degree (M value) of 60 or more.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: November 23, 2010
    Assignee: Sekisui Chemical Co., Ltd.
    Inventors: Akinobu Hayakawa, Hideaki Ishizawa, Kohei Takeda, Ryohei Masui
  • Publication number: 20100197830
    Abstract: The present invention has its object to provide an adhesive for electronic components, excellent in coatability, having high preventability of stains in bonded electronic components, and capable of providing highly reliable electronic components. The present invention relates to a liquid adhesive for electronic components, containing: a curable compound; a curing agent; and inorganic fine particles, a liquid portion in the liquid adhesive having a solubility parameter (SP value) in the range of 8 to 11 (including 8 and not including 11), the inorganic fine particles including a mixture of at least inorganic fine particles (A) and inorganic fine particles (B), the inorganic fine particles (A) having an average primary particle diameter of 50 nm or less and a hydrophobization degree (M value) in the range of 30 to 50 (including 30 and 50), and the inorganic fine particles (B) having an average primary particle diameter of 50 nm or less and a hydrophobization degree (M value) of 60 or more.
    Type: Application
    Filed: July 17, 2008
    Publication date: August 5, 2010
    Inventors: Akinobu Hayakawa, Hideaki Ishizawa, Kohei Takeda, Ryohei Masui
  • Publication number: 20100076119
    Abstract: The present invention has its object to provide an adhesive for bonding electronic components with a constant distance between them, which makes it possible to maintain a distance between bonded electronic components at high accuracy and to provide a highly reliable electronic apparatus, and which can be stably and continuously applied with a jet dispenser. The present invention is an adhesive for bonding electronic components, including spacer particles, an epoxy compound (A), and a curing agent. The spacer particles have a CV value of 10% or less. The epoxy compound (A) has a molecular structure including 10 or less monomer units with an aromatic ring in each repeating unit, is in a state of crystalline solid at 25° C., and has a viscosity of 1 Pa·s or less measured by an E-type viscometer at a temperature of 50 to 80° C.
    Type: Application
    Filed: January 11, 2008
    Publication date: March 25, 2010
    Applicant: SEKISUI CHEMICAL CO., LTD.
    Inventors: Hideaki Ishizawa, Akinobu Hayakawa, Kohei Takeda
  • Patent number: D658321
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: April 24, 2012
    Assignee: Mazda Motor Corporation
    Inventors: Kohei Takeda, Kazuhiro Ito