Patents by Inventor Taketoshi Murai

Taketoshi Murai 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: 20240174786
    Abstract: A lignin-modified novolac-type phenol resin having a weight average molecular weight of equal to or more than 5500.
    Type: Application
    Filed: March 25, 2022
    Publication date: May 30, 2024
    Applicant: SUMITOMO BAKELITE CO., LTD.
    Inventors: Taketoshi Murai, Yoshiyuki Go
  • Publication number: 20240166861
    Abstract: A heat-curable resin composition for a friction material includes a lignin-modified novolac-type phenol resin having a weight average molecular weight of equal to or more than 6,000, and a curing agent.
    Type: Application
    Filed: March 25, 2022
    Publication date: May 23, 2024
    Applicant: SUMITOMO BAKELITE CO., LTD.
    Inventor: Taketoshi Murai
  • Patent number: 10138377
    Abstract: A lignin derivative that is extracted from biomass and is used for rubber reinforcement or for use in a molding material is provided. Such a lignin derivative has a number average molecular weight of 300 to 2,000, and contains a component that is soluble in a polar organic solvent, in an amount of 80% by mass or more. When such a lignin derivative is incorporated, a lignin resin composition, a rubber composition, or a molding material, all of which have excellent low hysteresis loss characteristics, elastic modulus, or tensile properties, can be obtained. Furthermore, when a component that is thermofusible is used as the soluble component, a lignin resin composition, a rubber composition, or a molding material, all of which have superior aforementioned characteristics, can be obtained.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: November 27, 2018
    Assignee: SUMITOMO BAKELITE CO., LTD.
    Inventors: Taketoshi Murai, Hiroshige Nakagawa, Mitsutaka Matsumoto
  • Patent number: 10059793
    Abstract: Provided is a lignin resin composition including a lignin derivative having a weight-average molecular weight of 500 or more and 4000 or less and a novolac-type phenolic resin having a weight-average molecular weight of 1000 or more and 3000 or less, in which the content of the lignin derivative is not higher than the content of the novolac-type phenolic resin. In particular, the cured product (molded product) of a lignin resin composition obtained by melt-mixing such a lignin resin composition, adding hexamethylenetetramine thereto and then heating the resulting mixture has a high bending strength. Such a lignin resin composition is utilizable as a thermosetting resin substituting a phenolic resin.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: August 28, 2018
    Assignee: SUMITOMO BAKELITE CO., LTD.
    Inventors: Hiroshige Nakagawa, Mitsutaka Matsumoto, Taketoshi Murai
  • Publication number: 20170342188
    Abstract: Provided is a lignin resin composition including a lignin derivative having a weight-average molecular weight of 500 or more and 4000 or less and a novolac-type phenolic resin having a weight-average molecular weight of 1000 or more and 3000 or less, in which the content of the lignin derivative is not higher than the content of the novolac-type phenolic resin. In particular, the cured product (molded product) of a lignin resin composition obtained by melt-mixing such a lignin resin composition, adding hexamethylenetetramine thereto and then heating the resulting mixture has a high bending strength. Such a lignin resin composition is utilizable as a thermosetting resin substituting a phenolic resin.
    Type: Application
    Filed: November 18, 2015
    Publication date: November 30, 2017
    Applicant: SUMITOMO BAKELITE CO., LTD.
    Inventors: Hiroshige Nakagawa, Mitsutaka Matsumoto, Taketoshi Murai
  • Publication number: 20170253740
    Abstract: A lignin derivative that is extracted from biomass and is used for rubber reinforcement or for use in a molding material is provided. Such a lignin derivative has a number average molecular weight of 300 to 2,000, and contains a component that is soluble in a polar organic solvent, in an amount of 80% by mass or more. When such a lignin derivative is incorporated, a lignin resin composition, a rubber composition, or a molding material, all of which have excellent low hysteresis loss characteristics, elastic modulus, or tensile properties, can be obtained. Furthermore, when a component that is thermofusible is used as the soluble component, a lignin resin composition, a rubber composition, or a molding material, all of which have superior aforementioned characteristics, can be obtained.
    Type: Application
    Filed: August 31, 2015
    Publication date: September 7, 2017
    Applicant: SUMITOMO BAKELITE CO., LTD.
    Inventors: Taketoshi Murai, Hiroshige Nakagawa, Mitsutaka Matsumoto
  • Publication number: 20160230008
    Abstract: A resin composition having improved mechanical strength, hardness, and low heat generation property (low fuel consumption property) is developed, and when the same is used particularly in a rubber composition, a rubber composition that has a low tan ? (loss tangent) around 60° C., an improved E? (storage elastic modulus), and a reduced load on the environment is provided. A resin composition containing a lignin derivative (A), as well as either a modified novolac type phenol resin (B) or a cashew resin (B?), is provided. In one or a plurality of embodiments, the modified novolac type phenol resin (B) has a softening point of 150° C. or lower, and the modified novolac type phenol resin (B) is obtained by modification with a plant-derived compound.
    Type: Application
    Filed: October 16, 2014
    Publication date: August 11, 2016
    Applicant: SUMITOMO BAKELITE CO., LTD.
    Inventor: Taketoshi Murai
  • Publication number: 20140242312
    Abstract: A silicone rubber-based curable composition of the present invention contains: a vinyl group-containing organopolysiloxane (A); an organohydrogen polysiloxane (B); silica particles (C); a silane coupling agent (D); and a platinum or platinum compound (E), wherein satisfied is the following requirement X, or both the following requirements X and Y: Requirement X: the vinyl group-containing organopolysiloxane (A) contains both a vinyl group-containing linear organopolysiloxane (A1) and a vinyl group-containing branch organopolysiloxane (A2), Requirement Y: the organohydrogen polysiloxane (B) contains a mixture (B3) of a linear organohydrogen polysiloxane (B1) and a branch organohydrogen polysiloxane (B2), or the branch organohydrogen polysiloxane (B2). This makes it possible to provide a silicon rubber-based curable composition which can produce a silicone rubber having excellent tensile strength and tearing strength.
    Type: Application
    Filed: September 20, 2012
    Publication date: August 28, 2014
    Applicant: SUMITOMO BAKELITE COMPANY LIMITED
    Inventors: Taketoshi Murai, Kazunobu Senoo, Jun Okada, Motoyoshi Tsujimoto