| abstract |
(57) [Problem] To provide tetrafluoroethylene having excellent extrusion processability and useful for producing a porous body by stretching. SOLUTION: Tetrafluoroethylene and CF 2 ＣＦCFO It is produced by emulsion polymerization of CF 2 CF 2 CF 2 CF 2 OCF = CF 2, and the polymerization unit based on the latter is 0.5 mol%. A polymer having a standard specific gravity of less than 2.155, including: |