Patents by Inventor Xing-yi Dai

Xing-yi Dai 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 preparing a terpolymer of tetrafluoroethylene, ethylene and a third monomer
    Patent number: 4678847
    Abstract: The present invention relates to the process for preparing terpolymer of tetrafluoroethylene (TFE), ethylene (E), and a third monomer. According to the present invention, dicarbonate peroxide is used as initiator, 1,1,2-trichloro-1,2,2-trifluoro-ethane as the reaction medium and compounds of molecular formula C.sub.n R.sub.2n+2, wherein, n=0,1, or 2;R=H, Cl or F, are gaseous chain telomeric agents to control the average molecular weight of copolymers, the formula of third monomer is CF.sub.2 XCOCF.sub.2 X' or ##STR1## wherein X=X'=Cl or F, R.sub.1 =CF.sub.3 or CH.sub.3,R.sub.2 =CF.sub.3, CH.sub.3 or H, and R.sub.3 =H or F, usually the molar ratio of TFE to E is from 60:40 to 40:60 with the content of the third monomer being from 0.1% to 10%, based on the total molar amount of TFE and E.
    Type: Grant
    Filed: April 1, 1986
    Date of Patent: July 7, 1987
    Assignee: Shanghai Institute of Organic Chemistry, Academia Sinica
    Inventors: Yun-xiang Zhang, Xing-yi Dai, Zhi-kang Lu, Sen Zeng