Patents by Inventor Tsi T. Li

Tsi T. Li 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).

  • Thiodiethanol based polyurethane elastomers having improved dynamic properties and method for production thereof
    Patent number: 4349656
    Abstract: A method for the preparation of a polyetherthioether copolymer glycol represented by the formula:H--OC.sub.2 H.sub.4 SC.sub.2 H.sub.4 --.sub.x --OC.sub.4 H.sub.8 --.sub.y OHwherein the mole ratio x/y is in the range of about 45:55 to 60:40, respectively. More specifically, a method for the preparation of a copolymer of thiodiethanol and 1,4-butanediol wherein the mole ratio x/y is about 50:50. Also, the copolymers produced thereby and polyurethane elastomers produced therefrom, particularly those produced from the 50:50 copolymer, and to their use in solid tires having improved dynamic mechanical properties.
    Type: Grant
    Filed: January 26, 1981
    Date of Patent: September 14, 1982
    Assignee: American Cyanamid Company
    Inventors: Volker D. Arendt, Tsi T. Li
  • Thiodiethanol-based polyurethane elastomers having improved dynamic properties and method for production thereof
    Patent number: 4284761
    Abstract: A method for the preparation of a polyetherthioether copolymer glycol represented by the formula:H--OC.sub.2 H.sub.4 SC.sub.2 H.sub.4 --.sub.x --OC.sub.4 H.sub.8 --.sub.y OHwherein the mole ratio x/y is in the range of about 45:55 to 60:40, respectively. More specifically, a method for the preparation of a copolymer of thiodiethanol and 1,4-butanediol wherein the mole ratio x/y is about 50:50. Also, the copolymers produced thereby and polyurethane elastomers produced therefrom, particularly those produced from the 50:50 copolymer, and to their use in solid tires having improved dynamic mechanical properties.
    Type: Grant
    Filed: July 23, 1980
    Date of Patent: August 18, 1981
    Assignee: American Cyanamid Co.
    Inventors: Volker D. Arendt, Tsi T. Li