Patents by Inventor Joo-Sik Oh

Joo-Sik Oh 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 for preparing graft copolymer of methylmethacrylate-butadiene-styrene having superior anti-stress whitening properties
    Patent number: 6855786
    Abstract: The present invention relates to a method of preparing an impact-reinforcement agent for polyvinylchloride (PVC) resin having superior anti-stress whitening properties, and specifically to a method for preparing a graft copolymer of methyl-methacrylate-butadiene-styrene (MBS) comprising 3 steps of graft-copolymerizing monomers such as alkylmethacrylate, acrylate, and an ethylene-unsaturated aromatic compound to a rubber latex, in sequence.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: February 15, 2005
    Assignee: LG Chemical Co., Ltd.
    Inventors: Joo-Sik Oh, Sung-Koo Noh, Ok-Youl Jeong
  • Method for preparing graft copolymer of methylmethacrylate-butadiene-styrene having superior anti-stress whitening properties
    Publication number: 20030027916
    Abstract: The present invention relates to a method of preparing an impact-reinforcement agent for polyvinylchloride (PVC) resin having superior anti-stress whitening properties, and specifically to a method for preparing a graft copolymer of methyl-methacrylate-butadiene-styrene (MBS) comprising 3 steps of graft-copolymerizing monomers such as alkylmethacrylate, acrylate, and an ethylene-unsaturated aromatic compound to a rubber latex, in sequence.
    Type: Application
    Filed: June 21, 2002
    Publication date: February 6, 2003
    Inventors: Joo-Sik Oh, Sung-Koo Noh, Ok-Youl Jeong