Tetrafluoroethylene-containing powder, process for making same, articles molded therefrom and compositions containing such powder

摘要

A tetrafluoroethylene-containing powder contains free flowing particles of a tetrafluoroethylene polymer at least partially encapsulated by a polymer or copolymer selected from polystyrene, poly- alpha -alkylstyrenes, styrene-acrylonitrile copolymers, alpha -alkylstyrene-acrylonitrile copolymers, acrylonitrile-butadiene-styrene copolymers, styrene-butadiene rubbers and their mixtures. The powder is obtained by emulsion polymerization of one or more monomers in the presence of a tetrafluoroethylene polymer and is useful as an additive in polymer compositions and in making molded articles.