Stable tetrafluoroethylene copolymers
Preparation of finely divided pulverulent crosslinked copolymers
Polymerization of fluoroolefins
Hydrofluorocarbon solvents for fluoromonomer polymerization
Azeotrope-like compositions of trifluoromethane, carbon dioxide and sulfur hexafluoride
ApplicationNo. 853054 filed on 05/08/1997
US Classes:526/89, Polymerizing in the presence of a specified material other than monomer526/255, Two or more fluorine atoms, e.g., vinylidene fluoride, etc.526/942POLYMERIZATION IN THE PRESENCE OF A LIQUID CO2 DILUENT
ExaminersPrimary: Schofer, Joseph L.
Assistant: Sarofim, N.
Attorney, Agent or Firm
Foreign Patent References
International ClassC08F 002/00
AbstractThe present invention provides a process for making fluorinated polymers and copolymers having stable end groups. The process includes (1) contacting a fluoromonomer, an initiator capable of producing stable end groups on the polymer chain, and a polymerization medium comprising carbon dioxide, and (2) polymerizing the fluoromonomer. The polymerization medium preferably comprises liquid or supercritical carbon dioxide. Advantageously, the process may also include the step of separating the fluoropolymer from the polymerization medium. The present invention also provides polymerization reaction mixtures useful in the processes of the present invention.