Patents by Inventor David D. H. Tao

David D. H. Tao 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).

  • Process for preventing gel formation in lattices of hydrogenated, low molecular weight, functionalized elastomers
    Patent number: 7767751
    Abstract: The present invention discloses a process for hydrogenating a latex of a low molecular weight functionalized, unsaturated elastomer to produce a latex of a hydrogenated, low molecular weight, low gel, functionalized elastomer, said process comprising hydrogenating the low molecular weight, functionalized, unsaturated elastomer in the presence of (1) an oxidant selected from the group consisting of oxygen and hydroperoxides, (2) a reducing agent selected from the group consisting of hydrazine and hydrazine hydrates, and (3) a metal ion activator, wherein a hydroxylamine is added to the latex of the low molecular weight, functionalized, unsaturated elastomer or to the latex of the hydrogenated, low molecular weight, functionalized elastomer prior, during, or subsequent to the hydrogenation to produce the latex of the hydrogenated low molecular weight, low gel, functionalized elastomer.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: August 3, 2010
    Assignee: Zeon Chemicals, L.P.
    Inventors: David D. H. Tao, Michael Gozdiff, Edmee Files
  • PROCESS FOR PREVENTING GEL FORMATION IN LATTICES OF HYDROGENATED, LOW MOLECULAR WEIGHT, FUNCTIONALIZED ELASTOMERS
    Publication number: 20080275174
    Abstract: The present invention discloses a process for hydrogenating a latex of a low molecular weight functionalized, unsaturated elastomer to produce a latex of a hydrogenated, low molecular weight, low gel, functionalized elastomer, said process comprising hydrogenating the low molecular weight, functionalized, unsaturated elastomer in the presence of (1) an oxidant selected from the group consisting of oxygen and hydroperoxides, (2) a reducing agent selected from the group consisting of hydrazine and hydrazine hydrates, and (3) a metal ion activator, wherein a hydroxylamine is added to the latex of the low molecular weight, functionalized, unsaturated elastomer or to the latex of the hydrogenated, low molecular weight, functionalized elastomer prior, during, or subsequent to the hydrogenation to produce the latex of the hydrogenated low molecular weight, low gel, functionalized elastomer.
    Type: Application
    Filed: July 21, 2008
    Publication date: November 6, 2008
    Applicant: ZEON CHEMICALS, L.P.
    Inventors: David D.H. Tao, Michael Gozdiff, Edmee Files
  • Process for preventing gel formation in lattices of hydrogenated, low molecular weight, functionalized elastomers
    Patent number: 7411015
    Abstract: The present invention discloses a process for hydrogenating a latex of a low molecular weight functionalized, unsaturated elastomer to produce a latex of a hydrogenated, low molecular weight, low gel, functionalized elastomer, said process comprising hydrogenating the low molecular weight, functionalized, unsaturated elastomer in the presence of (1) an oxidant selected from the group consisting of oxygen and hydroperoxides, (2) a reducing agent selected from the group consisting of hydrazine and hydrazine hydrates, and (3) a metal ion activator, wherein a hydroxylamine is added to the latex of the low molecular weight, functionalized, unsaturated elastomer or to the latex of the hydrogenated, low molecular weight, functionalized elastomer prior, during, or subsequent to the hydrogenation to produce the latex of the hydrogenated low molecular weight, low gel, functionalized elastomer.
    Type: Grant
    Filed: July 8, 2005
    Date of Patent: August 12, 2008
    Assignee: Zeon Chemicals, L.P.
    Inventors: David D. H. Tao, Michael Gozdiff, Edmee Files