Patent ID: 8053527

Claim:
Melt-mixed composition comprising a dispersion of submicrometer-size particles comprising non-melt flowable polytetrafluoroethylene having a melt creep viscosity of at least 1×10 6 Pa·s at 380° C. in a continuous phase comprising melt-fabricable perfluoropolymer having a melt flow rate of from about 0.1 to 500 g/10 min as measured in accordance with Table 2 of ASTM D-1238-94a, said non-melt flowable polytetrafluoroethylene constituting at least about 4 wt % of the combined weight of said non-melt flowable polytetrafluoroethylene and said melt-fabricable perfluoropolymer, said composition exhibiting thixotropy when being subjected to increasing shear in the molten state.