Patents by Inventor Paul Ling-Kong Hung

Paul Ling-Kong Hung 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).

  • Polyurethane coating compositions
    Publication number: 20030158327
    Abstract: A coating composition containing a polyisocyanate compound having an isocyanate functionality of greater than 1, a polyol compound having an average hydroxyl functionality of greater than 1, wherein the relative amounts of polyisocyanate compound and polyol compound are in an amount effective to provide from 0.5 to 1.5 equivalents of isocyanate groups per equivalent of hydroxyl groups, from 0.0002 to 5 parts by weight of an organometallic curing catalyst selected from organobismuth, organozirconium or organoaluminum curing catalysts per 100 parts by weight of the polyisocyanate compound and from 0.0001 to 2.5 parts by weight of a moisture scavenger per 100 parts by weight of the polyisocyanate compound exhibits improved resistance to surface imperfections due to the phenomenon of “solvent popping”.
    Type: Application
    Filed: January 21, 2003
    Publication date: August 21, 2003
    Inventors: Qiwen Han, Paul Ling-Kong Hung
  • Method for scavenging moisture in polyisocyanates and formulations thereof
    Patent number: 6291577
    Abstract: Scavenging moisture from a polyisocyanate useful for preparing thermosetting polyurethane coatings therefrom is accomplished by admixing with the polyisocyanate a t-butylated hydroxytoluene and an alkyl ester of toluenesulfonic acid in which the alkyl ester comprises at least 90% para ester, thereby improving the shelf life of the polyisocyanate.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: September 18, 2001
    Assignee: Rhodia Inc.
    Inventors: Hui Shirley Yang, Paul Ling-Kong Hung