Patents by Inventor Dongll Yoon

Dongll Yoon 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).

  • End-modified diene copolymer and rubber composition for tire tread including the same
    Patent number: 6846873
    Abstract: The present invention relates to an end-modified diene copolymer and a rubber composition for tire tread containing the same. More particularly, the present invention relates to a polymer and a rubber composition for tire tread comprising a mixture of the polymer with a vulcanizing agent and an inorganic filler such as carbon black and silica, the polymer being prepared by reacting the active end of a conjugate diene polymer, or a copolymer comprising at least one conjugate diene compound and a vinyl-substituted aromatic compound, polymerization-initiated using an organic lithium catalyst, with a coupling agent. The rubber composition for tire treads comprising the end-modified diene copolymer as an ingredient rubber enhances rolling resistance and wet skid resistance as well as mechanical properties directly concerned to the properties of the tires.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: January 25, 2005
    Assignee: Korea Kumho Petrochemical Co., Ltd.
    Inventors: YoungHoon Ko, Dongll Yoon, DaiSeung Choi, JungSu Park
  • End-modified diene copolymer and rubber composition for tire tread including the same
    Publication number: 20020123554
    Abstract: The present invention relates to an end-modified diene copolymer and a rubber composition for tire tread containing the same. More particularly, the present invention relates to a polymer and a rubber composition for tire tread comprising a mixture of the polymer with a vulcanizing agent and an inorganic filler such as carbon black and silica, the polymer being prepared by reacting the active end of a conjugate diene polymer, or a copolymer comprising at least one conjugate diene compound and a vinyl-substituted aromatic compound, polymerization-initiated using an organic lithium catalyst, with a coupling agent. The rubber composition for tire treads comprising the end-modified diene copolymer as an ingredient rubber enhances rolling resistance and wet skid resistance as well as mechanical properties directly concerned to the properties of the tires.
    Type: Application
    Filed: June 29, 2001
    Publication date: September 5, 2002
    Inventors: YoungHoon Ko, Dongll Yoon, DaiSeung Choi, JungSu Park