Process aid for melt processable polymers

An extrudable composition for passing through a die, said composition comprising:

• A) a non-fluorinated melt processable polymer;
• B) 25 to 2000 parts per million by weight, based on total weight of the extrudable composition, of a fluoropolymer, said fluoropolymer having a weight average particle size greater than 2 microns and less than 10 microns, as measured at a point immediately preceding the die;
• and
• C) at least an effective amount of interfacial agent to achieve a fluoropolymer weight average particle size greater than 2 microns and less than 10 microns as measured at a point immediately preceding the die, but no more than a 5:1 weight ratio of interfacial agent to fluoropolymer.

A process aid masterbatch comprising:

• A) a non-fluorinated melt processable polymer;
• B) 1 to 50 weight percent, based on total weight of the masterbatch, of fluoropolymer;
• and
• C) at least an effective amount, to improve processability, of interfacial agent, but no more than a 5:1 weight ratio of interfacial agent to fluoropolymer, with the proviso that if the interfacial agent is a poly(oxyalkylene) polymer, it is present at less than a 1:1 weight ratio of poly(oxyalkylene) polymer to fluoropolymer.