| abstract |
A process for polymerizing fine powder type intrinsic tetrafluoroethylene (TFE) copolymer is provided, the copolymer containing polymerized comonomer units of at least one comonomer other than TFE at a concentration of at least 1.0 weight percent or greater than 1.0 weight percent. And the concentration of the polymerization comonomer unit may exceed 5.0 mass percent. The copolymer is stretchable, i.e., the copolymer may be stretched to produce a strong, useful stretched TFE copolymer article having a microstructure of nodes interconnected by fibrils. |