Lubricated thermoplastic compositions of polyvinylidene fluoride

Claim 1

A process for molding polyvinylidene fluoride compositions using a lubricated polyinylidene consisting esstentially of: (a) blending said polyvinylidene fluoride composition with from about 0.1 W% to about 10 W% low molecular weight polytetrafluoroethylene wherein from about 0.1 W% to about 0.8 W% low molecular weight polytetrafluoroethylene is used to lubricate high molecular weight polyvinylidene fluoride compositions and from about 0.5 W% to about 10 W% low molecular weight polytetrafluoroethylene is used to lubricate medium and low molecular weight polyvinylidene fluoride compositions, said polytetrafluoroethylene having a molecular weight of about 800,000 or less and being sufficiently low in molecular weight to reduce the viscosity of said polyvinylidene fluoride in its molten state, said polytetrafluorothylene having at least 90 mole percent tetrafluoroethylene groups, and said polyvinylidene fluoride having at least 90 mole percent vinylidenefluoride groups and having a melt index when measured at 250° C. of: (1) from about 50 to 1000 when it is a high molecular weight polymer, (2) from about 1000 to 4000 when it is a medium molecular polymer and (3) over 4000 when it is a low molecular weight polymer; and (b) molding said lubricated polyvinylidene fluoride composition.