Patents by Inventor Daisuke Koda

Daisuke Koda 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: 20220306822
    Abstract: To provide surface-modified fibers and reinforcing fibers that are capable of enhancing the adhesiveness to rubber, without the use of resorcinol and formaldehyde, and a molded article using the same. Surface-modified fibers include fibers, and a surface-modifying layer covering at least a part of a surface of the fibers, and have a solid surface zeta potential on a surface of the surface-modifying layer of ?20.0 to 30.0 mV.
    Type: Application
    Filed: November 10, 2020
    Publication date: September 29, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Eiichi ISHIDA, Daisuke KODA, Toru ASADA, Shinichi TAKEMOTO, Shuhei YORIMITSU, Hiroyuki KAWAI
  • Publication number: 20220267537
    Abstract: The present invention provides a modified conjugated diene polymer that has excellent hydrophilicity and is useful for modification of polar polymers. The present invention also provides a modified conjugated diene polymer and a polymer modifier that, when used for modification of a polar polymer, can enhance characteristics, for example, flexibility, of the composition including the polymer and also offer excellent processability and shaping properties. The present invention further provides a polymer composition including such a conjugated diene polymer. A polymer modifier (A) includes a modified conjugated diene polymer (A1) having a hydrophilic group having a polyethylene glycol structure.
    Type: Application
    Filed: July 10, 2020
    Publication date: August 25, 2022
    Applicant: KURARAY CO., LTD.
    Inventor: Daisuke KODA
  • Publication number: 20220220286
    Abstract: A diene rubber may give a crosslinked product or forming a rubber composition which has high levels of both ice grip performance and wet grip performance; a rubber composition may include the diene rubber; a tire member may be formed from the rubber composition or a crosslinked product thereof; and a tire may include the rubber composition or a crosslinked product thereof as at least a portion thereof. A resin modifier may include the diene rubber and give such a resin composition. A diene rubber may include butadiene units and an Mw of 5,000 to 50,000, and may satisfy (i) to (iii): (i) ?cp>0; (ii) ?12>40; and (iii) ?cp/(?12?40)?2, wherein ?12 is the mol % of 1,2-bonded butadiene units, and ?cp is the mol % of specific structural units, both with respect to all butadiene units present in the diene rubber.
    Type: Application
    Filed: May 21, 2020
    Publication date: July 14, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Yoshikazu UENO, Daisuke KODA
  • Publication number: 20220056245
    Abstract: Provided are a rubber composition which can give a crosslinked product with enhanced tensile strength, and a pneumatic tire including the rubber composition as a portion thereof. The rubber composition includes a solid rubber (A), a hydrogenated aromatic vinyl-conjugated diene random copolymer (B), and a filler (C). The random copolymer (B) satisfies the following (i) to (iv). (i) The content of aromatic vinyl units is 10 to 70 mass %. (ii) The vinyl content in conjugated diene units of the random copolymer (B) before hydrogenation is 10 to 70 mol %. (iii) The hydrogenation ratio of the conjugated diene units is not less than 10 mol %. (iv) The weight average molecular weight is 3,000 to 100,000.
    Type: Application
    Filed: December 12, 2019
    Publication date: February 24, 2022
    Inventors: Daisuke KODA, Yoshikazu UENO
  • Publication number: 20220049062
    Abstract: Provided are reinforcing fibers using an adhesive component not containing resorcinol and formaldehyde, which are excellent in adhesiveness to rubber and which can be efficiently produced while preventing contamination of production facilities, and a method for producing them, as well as a molded article using them. The reinforcing fibers have an adhesive component that contains a conjugated diene rubber and an oil, in at least a part of the surfaces thereof, wherein the vapor pressure at 20° C. of the oil is 10 Pa or less.
    Type: Application
    Filed: February 21, 2020
    Publication date: February 17, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Toru ASADA, Daisuke KODA, Shuhei YORIMITSU, Shinichi TAKEMOTO, Hiroyuki KAWAI
  • Patent number: 11124631
    Abstract: Disclosed herein is a rubber composition containing 100 parts by mass of a solid rubber (A), 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound represented by the formula (1), and 20 to 200 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying (i) to (iii): (i) a weight average molecular weight (Mw) is not less than 1,000 and less than 15,000; (ii) a vinyl content is not more than 70 mol %; and (iii) an average number of functional groups per molecule of the modified liquid diene rubber (B) is 1 to 20.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: September 21, 2021
    Assignee: KURARAY CO., LTD.
    Inventors: Hiromi Maeda, Daisuke Koda, Hiroshi Kanbara, Satomi Ohta
  • Publication number: 20210246299
    Abstract: The present invention provides a rubber composition having superior moldability, wear resistance, and grip performance, and tires therewith. The present invention relates to a rubber composition comprising: a copolymer (B) constituted of a vinyl alcohol polymer (B-1) region and a diene polymer (B-2) region; and a rubber component (C), wherein the rubber composition comprises 1 to 20 parts by mass of the copolymer (B) relative to 100 parts by mass of the rubber component (C).
    Type: Application
    Filed: June 7, 2019
    Publication date: August 12, 2021
    Applicant: KURARAYCO., LTD.
    Inventors: Yusuke AMANO, Eiichi ISHIDA, Kazuhiko MAEKAWA, Daisuke KODA, Hiroshi KANBARA
  • Publication number: 20210222036
    Abstract: Reinforcing fibers containing hydrophilic fibers and an adhesive component, wherein at least a part of the surfaces of the hydrophilic fibers have the adhesive component, the adhesive component contains a modified conjugated diene rubber having a hydrogen-bonding functional group in a part of the conjugated diene rubber, and the number of the hydrogen-bonding functional groups in the modified conjugated diene rubber is 2 to 150 per molecule on average; a method for producing the reinforcing fibers; and a molded article using the reinforcing fibers.
    Type: Application
    Filed: May 28, 2019
    Publication date: July 22, 2021
    Applicant: KURARAY CO., LTD.
    Inventors: Toru ASADA, Daisuke KODA, Shinichi TAKEMOTO, Hiroyuki KAWAI, Shuhei YORIMITSU
  • Patent number: 11034821
    Abstract: A rubber composition includes 100 parts by mass of a solid rubber (A), 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound represented by the formula (1), and 20 to 200 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying (i) to (iii) below: (i) The weight average molecular weight (Mw) is 15,000 to 120,000. (ii) The vinyl content is not more than 70 mol %. (iii) The average number of functional groups per molecule of the modified liquid diene rubber (B) is 1 to 30.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: June 15, 2021
    Assignee: KURARAY CO., LTD.
    Inventors: Hiromi Maeda, Daisuke Koda, Hiroshi Kanbara, Satomi Ohta
  • Publication number: 20210017320
    Abstract: The invention provides a modified liquid diene polymer that allows a rubber composition to give a crosslinked product which contains a filler in a dispersed state ideal for attaining enhanced properties and which also exhibits excellent properties such as wet grip and abrasion resistance. The invention also provides a rubber composition including the modified liquid diene polymer, a crosslinked product thereof, and a tire which includes a portion including the composition or the crosslinked product. The modified liquid diene polymer is a product of modification, with a specific silane compound, of a liquid diene block copolymer including a polymer block (b?1) or (b?1) containing butadiene units and a polymer block (b?2) or (b?2). The modified liquid diene polymer has a functional group derived from the silane compound, and satisfies specific conditions.
    Type: Application
    Filed: March 4, 2019
    Publication date: January 21, 2021
    Inventors: Satomi OHTA, Hiroshi KANBARA, Daisuke KODA
  • Publication number: 20210017378
    Abstract: The present invention relates to a block copolymer that contains a polymer block A containing a farnesene-derived monomer unit (a1) and a random copolymer block B containing a C12 or lower conjugated diene-derived monomer unit (b1) and an aromatic vinyl compound-derived monomer unit (b2), the block copolymer having a ratio by mass of the polymer block A to the random copolymer block B (A/B) of 30/70 to 0.5/99.5, a content of the aromatic vinyl compound-derived monomer unit (b2) in the random copolymer block B of 1 to 50% by mass, and a weight average molecular weight (Mw) of 100,000 to 5,000,000.
    Type: Application
    Filed: March 28, 2019
    Publication date: January 21, 2021
    Applicants: KURARAY CO., LTD., AMYRIS, INC.
    Inventor: Daisuke KODA
  • Publication number: 20200392313
    Abstract: The invention provides a high-grip tire rubber composition satisfying wet grip performance, dry grip performance and steering stability in a high and well-balanced manner, and a tire tread, a bead filler, a tire belt and a pneumatic tire which each partially include the composition. The high-grip tire rubber composition includes 100 parts by mass of a solid rubber (A), the solid rubber (A) including not less than 60 mass % of a styrene butadiene rubber with 20 mass % or more styrene content, 0.1 to 90 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 150 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) to (iii): (i) the weight average molecular weight (Mw) is not less than 1,000 and less than 15,000, (ii) the vinyl content is not more than 70 mol %, and (iii) the average number of the functional groups per molecule of the modified liquid diene rubber (B) is 1 to 20.
    Type: Application
    Filed: August 29, 2018
    Publication date: December 17, 2020
    Applicant: Kuraray Co., Ltd.
    Inventors: Hiroshi KANBARA, Daisuke KODA, Yosuke UEHARA
  • Publication number: 20200369802
    Abstract: A modified diene polymer is provided which may be added to a rubber composition together with a filler to allow the filler to be dispersed in a crosslinked product of the composition in a state that is ideal for attaining enhanced properties. A method for producing such modified diene polymers is also provided. The modified linear diene polymer has a specific functional group only at one end thereof, the average number of the functional groups per molecule being 0.8 to 1.
    Type: Application
    Filed: November 30, 2018
    Publication date: November 26, 2020
    Applicant: KURARAY CO., LTD.
    Inventor: Daisuke KODA
  • Publication number: 20200332089
    Abstract: The tire rubber composition includes 100 parts by mass of a solid rubber (A) having a glass transition temperature (Tg) of not more than ?10° C., 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 200 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) to (iv): (i) the weight average molecular weight (Mw) is 15,000 to 120,000, (ii) the vinyl content is not more than 70 mol %, (iii) the average number of the functional groups per molecule of the modified liquid diene rubber (B) is 1 to 30, and (iv) the glass transition temperature (Tg) is not more than 0° C.
    Type: Application
    Filed: August 29, 2018
    Publication date: October 22, 2020
    Applicant: KURARAY CO., LTD.
    Inventors: Hiroshi KANBARA, Daisuke KODA
  • Publication number: 20200332090
    Abstract: The invention provides a heavy-duty tire rubber composition capable of giving heavy-duty tires which exhibit low heat generation properties and have good abrasion resistance, and also provides a tire tread, a bead filler, a tire belt and a heavy-duty tire which each partially include the composition. The heavy-duty tire rubber composition includes 100 parts by mass of a solid rubber (A), 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 200 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) and (ii): (i) the weight average molecular weight (Mw) is not less than 1,000 and not more than 120,000, and (ii) the vinyl content is less than 30 mol %.
    Type: Application
    Filed: August 29, 2018
    Publication date: October 22, 2020
    Applicant: KURARAY CO., LTD.
    Inventors: Daisuke KODA, Hiroshi KANBARA
  • Patent number: 10781298
    Abstract: The present invention relates to a copolymer including a monomer unit (a) derived from isoprene and a monomer unit (b) derived from farnesene; a process for producing the copolymer including at least the step of copolymerizing isoprene with farnesene; a rubber composition including (A) the copolymer, (B) a rubber component and (C) carbon black; a rubber composition including (A) the copolymer, (B) a rubber component and (D) silica; a rubber composition including (A) the copolymer, (B) a rubber component, (C) carbon black and (D) silica; and a tire using the rubber composition at least as a part thereof.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: September 22, 2020
    Assignees: KURARAY CO., LTD., AMYRIS, INC.
    Inventors: Daisuke Koda, Kei Hirata
  • Publication number: 20200254816
    Abstract: The invention provides a heavy-duty tire rubber composition excellent in wet grip performance and steering stability, and a tire tread, a bead filler, a tire belt and a heavy-duty tire which each partially include the composition. The heavy-duty tire rubber composition includes 100 parts by mass of a solid rubber (A), 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 200 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) and (ii): (i) the weight average molecular weight (Mw) is not less than 1,000 and not more than 120,000, and (ii) the vinyl content is not less than 30 mol % and less than 70 mol %.
    Type: Application
    Filed: August 29, 2018
    Publication date: August 13, 2020
    Applicant: KURARAY CO., LTD.
    Inventors: Daisuke KODA, Hiroshi KANBARA
  • Publication number: 20200207957
    Abstract: The invention provides a high-grip tire rubber composition excellent in steering stability, rolling resistance performance and abrasion resistance, and a tire tread, a bead filler, a tire belt and a pneumatic tire which each partially include the composition. The high-grip tire rubber composition includes 100 parts by mass of a solid rubber (A), the solid rubber (A) including not less than 60 mass % of a styrene butadiene rubber with 20 mass % or more styrene content, 0.1 to 90 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 150 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) and (ii): (i) the weight average molecular weight (Mw) is 15,000 to 120,000, and (ii) the vinyl content is not more than 70 mol %.
    Type: Application
    Filed: August 29, 2018
    Publication date: July 2, 2020
    Applicant: KURARAY CO., LTD.
    Inventors: Hiroshi KANBARA, Daisuke KODA, Yosuke UEHARA
  • Publication number: 20200207956
    Abstract: The invention provides a tire rubber composition capable of giving crosslinked products having excellent properties including mechanical strength such as abrasion resistance, a crosslinked product of the composition, and a tire tread, a bead filler, a tire belt and a pneumatic tire which each partially include the composition or the crosslinked product and which each exhibit satisfactory dry grip performance plus excellent wet grip performance and ice grip performance and can attain enhanced steering stability. The tire rubber composition includes 100 parts by mass of a solid rubber (A) having a glass transition temperature (Tg) of not more than ?10° C., 0.
    Type: Application
    Filed: August 29, 2018
    Publication date: July 2, 2020
    Applicant: KURARAY CO., LTD.
    Inventors: Hiroshi KANBARA, Daisuke KODA
  • Patent number: 10550248
    Abstract: The present invention provides a rubber composition capable of producing a rubber molded article that is excellent in rolling resistance performance, steering stability, mechanical strength and abrasion resistance, and a tire obtained by using the rubber composition in at least a part thereof. The present invention relates to a rubber composition including (A) a rubber component including at least one rubber selected from the group consisting of a synthetic rubber and a natural rubber, (B) silica and (C) a modified polymer of farnesene obtained by introducing a functional group into a polymer of farnesene, in which a content of the silica (B) in the rubber composition is from 20 to 150 parts by mass on the basis of 100 parts by mass of the rubber component (A), and a content of the modified farnesene polymer (C) in the rubber composition is from 2 to 10 parts by mass on the basis of 100 parts by mass of the silica (B).
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: February 4, 2020
    Assignees: KURARAY CO., LTD., AMYRIS, INC.
    Inventors: Daisuke Koda, Kei Hirata