Fluorinated greases

摘要

Fluorinated greases comprising (by weight): 15%-50% polytetrafluoroethylene or tetrafluoroethylene copolymers with other ethylenically unsaturated monomers; 30%-84.5% perfluoropolyether oil having a viscosity comprised between 20 and 4000 mm S<-1> (cSt) at 20 DEG C; 0.5%-10% surfactant or dispersant having perfluoropolyether or perfluoroalkyl chain; 0%-10% of an anticorrosion and/or antiwear additive, such that the (per)fluoropolymer particles based on TFE or their aggregates have average sizes lower than one micrometer and show WEAR diameter values, lower that at least 25% with respect to those of the corresponding fluorinated grease of the prior art, the components of the formulation being equal.