| abstract |
Polytetrafluoroethylene resin, coagulated after aqueous dispersion polymerization, having a fibrillatable character that is observable under high magnification and is manifested by high stretchability and long stress relaxation time under given conditions, is obtained by the aqueous dispersion technique, but with the polymerization initiator and its concentration, and the method of charging the initiator to the aqueous polymerization medium, and the temperature of polymerization being controlled to produce the resin. The resin is useful in applications served by earlier polytetrafluoroethylenes that have been coagulated from aqueous dispersion polymerization and is especially useful where processing conditions require shear or stretching. |