Patents by Inventor Hiroshi AOSHIMA

Hiroshi AOSHIMA 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).

  • Conjugated diene polymer and method for producing conjugated diene polymer
    Patent number: 11377513
    Abstract: The method for producing a conjugated diene-based polymer of the invention comprises step 1 in which a polymerization initiator is added to a monomer including a conjugated diene compound in a hydrocarbon solvent to obtain a polymerization solution, and step 2 in which a polymerization initiator is further added to the polymerization solution either once or two or more times to obtain a polymer with an active end, wherein in step 1 and/or step 2, a modifying agent is added which has a functional group that is copolymerizable with the conjugated diene compound.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: July 5, 2022
    Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventor: Hiroshi Aoshima
  • CONJUGATED DIENE COPOLYMER AND METHOD FOR MANUFACTURING CONJUGATED DIENE COPOLYMER
    Publication number: 20220185919
    Abstract: A conjugated diene copolymer has a covalent bond reversibly dissociated and added by heat, and has at least two peaks in each of curves of molecular weight distributions measured at 40° C. and 60° C. by gel permeation chromatography, wherein a change rate of the proportion of the area of the peak having the lowest molecular weight in measurement at 60° C. to the proportion of the area of the peak having the lowest molecular weight in measurement at 40° C.
    Type: Application
    Filed: March 27, 2020
    Publication date: June 16, 2022
    Applicants: ZS ELASTOMERS CO., LTD., SUMITOMO CHEMICAL COMPANY, LIMITED, ZEON CORPORATION
    Inventors: Hiroshi AOSHIMA, Jesus RODRIGUEZ CASTANON, Hisakatsu HAMA
  • Method for producing modified conjugated diene polymer and method for producing polymer composition
    Patent number: 11046791
    Abstract: The invention relates to a method for producing a modified conjugated diene-based polymer, comprising a step of reacting an organometallic compound with a unit based on a modifying agent, in a conjugated diene-based polymer that has a unit based on a conjugated diene compound-containing monomer and a unit based on a modifying agent having a silicon atom, tin atom, germanium atom or phosphorus atom.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: June 29, 2021
    Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Hiroshi Aoshima, Masako Imai, Katsunari Inagaki
  • METHOD FOR PRODUCING MODIFIED CONJUGATED DIENE POLYMER AND METHOD FOR PRODUCING POLYMER COMPOSITION
    Publication number: 20200216578
    Abstract: The invention relates to a method for producing a modified conjugated diene-based polymer, comprising a step of reacting an organometallic compound with a unit based on a modifying agent, in a conjugated diene-based polymer that has a unit based on a conjugated diene compound-containing monomer and a unit based on a modifying agent having a silicon atom, tin atom, germanium atom or phosphorus atom.
    Type: Application
    Filed: August 4, 2017
    Publication date: July 9, 2020
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Hiroshi AOSHIMA, Masako IMAI, Katsunari INAGAKI
  • CONJUGATED DIENE POLYMER AND METHOD FOR PRODUCING CONJUGATED DIENE POLYMER
    Publication number: 20200031976
    Abstract: The method for producing a conjugated diene-based polymer of the invention comprises step 1 in which a polymerization initiator is added to a monomer including a conjugated diene compound in a hydrocarbon solvent to obtain a polymerization solution, and step 2 in which a polymerization initiator is further added to the polymerization solution either once or two or more times to obtain a polymer with an active end, wherein in step 1 and/or step 2, a modifying agent is added which has a functional group that is copolymerizable with the conjugated diene compound.
    Type: Application
    Filed: March 26, 2018
    Publication date: January 30, 2020
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventor: Hiroshi AOSHIMA