Patents by Inventor Jing-Cheng Cheng Tsai

Jing-Cheng Cheng Tsai 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).

  • Catalyst composition for preparing high-syndiotactivity polystyrene from styrene or other aryl ethylene monomers and processes using the same
    Patent number: 5914375
    Abstract: An catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR'.sub.1 R'.sub.2 R'.sub.3 R'.sub.4 or TiR'.sub.1 R'.sub.2 R'.sub.3, wherein R'.sub.1, R'.sub.2, R'.sub.3, and R'.sub.4 are, independently, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, a hydrogen atom, or a halogen atom; (b) a cyclopentadienyl complex of silicon (Si), germanium (Ge), or tin (Sn) represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: June 22, 1999
    Assignee: Industrial Technology Research Institute
    Inventors: Jing-Cheng Cheng Tsai, Shian-Jy Wang, Shu-Ling Peng, Mickey Sue