Patents by Inventor Dong-Won Jun

Dong-Won Jun 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).

  • Method of preparing diene latex having a large particle size by addition of a pretreated seed latex to an agglomerating agent
    Patent number: 6777483
    Abstract: A method of preparing a diene rubber latex having large size particles, good stability and reduced coagulum during polymerization wherein the method comprises: (a) pretreating a seed diene rubber latex with an anionic emulsifier and a non-ionic emulsifier, (b) adjusting the pH of an unsaturated carboxylic acid-containing copolymer latex to about 5 to 11 and adjusting the solids content of the copolymer latex to about 1 to 10% by weight solids content to produce an agglomerating latex solution, and (c) adding the pretreated seed diene rubber latex of step (a) to the agglomerating latex solution of step (b). Step (c) must be carried out by adding the pretreated seed diene rubber latex to the agglomerating latex. If the agglomerating latex is added to the rubber latex, an undesirable level of coagulum is produced.
    Type: Grant
    Filed: August 6, 2002
    Date of Patent: August 17, 2004
    Assignee: Cheil Industries Inc.
    Inventors: Byeong-Do Lee, Ki-bo Chang, Kwang-Yeol Lim, Dong-Won Jun
  • Method of preparing diene latex having a large particle size by addition of a pretreated seed latex to an agglomerating agent
    Publication number: 20020198309
    Abstract: A method of preparing a diene rubber latex having large size particles, good stability and reduced coagulum during polymerization wherein the method comprises:
    Type: Application
    Filed: August 6, 2002
    Publication date: December 26, 2002
    Applicant: CHEIL INDUSTRIES INC.
    Inventors: Byeong-Do Lee, Ki-Bo Chang, Kwang-Yeol Lim, Dong-Won Jun