Processing aids and masterbatches for the same

Abstract

The present invention relates to a processing aid of a non-fluorinated melt-processable polymer and a masterbatch for a processing aid, features the inclusion of a processing aid comprising a fluoropolymer forming clustered secondary particles each having a particle size of 2 μm to 2 mm and being a combination of primary fluoropolymer particles each having a diameter of 0.02 μm to 0.5 μm, and may accelerate the elimination of melt fracture despite the omission of an interfacial agent and decrease extrusion load upon process to thereby enhance productability.

What is claimed is: 
     
         1 . A processing aid comprising a fluoropolymer forming clustered secondary particles each having a particle size of 2 μm to 2 mm and being a combination of primary fluoropolymer particles each having a diameter of 0.02 μm to 0.5 μm and formed of a co-polymer of vinylidene fluoride and hexafluoropropylene. 
     
     
         2 . The processing aid of  claim 1 , further comprising a partitioning agent of one to 20 parts by weight relative to the fluoropolymer of 100 parts by weight. 
     
     
         3 . The processing aid of  claim 2 , wherein the partitioning agent includes one or more of an inorganic powder with a mean particle size of 0.5 μm to 10 μm or an organic powder with a mean particle size of 1 mm or less, wherein the inorganic powder is one or more species selected from the group consisting of talc, silica, and calcium carbonate, and the organic powder is one or more species selected from the group consisting of an antioxidant, an ultraviolet (UV) absorbent, a flame retardant, a heat stabilizer, a photostabilizer, a metal passivant, an enhancer, a plasticizer, a lubricant, an emulsifier, a pigment, an optical brightener, an antistatic agent, and a foaming agent. 
     
     
         4 . A masterbatch for a processing aid, the masterbatch comprising a non-fluorinated melt-processable polymer and the processing aid of  claim 1 . 
     
     
         5 . The masterbatch of  claim 4 , the masterbatch comprising the non-fluorinated melt-processable polymer of 80 weight % to 99.5 weight % and the processing aid of 0.5 weight % to 20 weight %.