Abstract: Polytetrafluoroethylene (PTFE) fine powder is provided which exhibits both low rheometer extrusion pressure and high adhesion to wire by incorporating into the free powder the combination of perfluoro(alkyl) ethylene such as perfluoro(n-butyl) ethylene with fluoro(alkyl vinyl ether), such as perfluoro(propyl vinyl ether), or fluoroolefin such as hexafluoropropylene as modifiers of the PTFE fine powder. The modified PTFE fine powder is made by aqueous dispersion copolymerization of TFE with the modifying monomers, with the addition of molecular weight reducing agent towards the end of the polymerization reaction.

Abstract: A means for reducing discoloration and/or spotting occurring at air-starved areas of sintered moldings of filled comminuted granular tetrafluoroethylene resin is described which comprises incorporating a silicone into granular comminuted tetrafluoroethylene resin containing a filler material.

Abstract: A means for reducing discoloration or dark spotting occurring at air-starved areas of glass filled agglomerated granular tetrafluoroethylene resin during sintering is described which comprises employing a silicone and an agent that forms a substantially water-soluble complex with iron during the agglomeration of the filled poly-tetrafluoroethylene mixture in liquid.