Process aid for melt processable polymers

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

A) a non-fluorinated melt processable polymer, wherein said non-fluorinated melt processable polymer is a hydrocarbon resin selected from the group consisting of i) polyethylenes, ii) polypropylene, iii) polybutene-1, iv) poly(3-methylbutene), v) poly(methylpentene), and vi) copolymers of ethylene with an alpha-olefin; and

B) 25 to 2000 parts per million by weight, based on total weight of the extrudable composition, of 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 wherein said composition is substantially free of interfacial agent.

2. The composition of claim 1 wherein the fluoropolymer is a fluoroelastomer.

3. The composition of claim 2 wherein the fluoroelastomer has a ML(1+10) at 121° C. up to 80.

4. The composition of claim 1 wherein the fluoropolymer is a semi-crystalline fluoropolymer.

5. The composition of claim 4 wherein the semi-crystalline fluoropolymer has a melt index (ASTM D1238, 265° C., 5 kg weight) greater than 0.5 dg/min.

6. The composition of claim 1 wherein the weight average particle size of the fluoropolymer is greater than 4 microns as measured at a point immediately preceding the die.

7. The composition of claim 6 wherein the weight average particle size of the fluoropolymer is greater then 6 microns as measured at a point immediately preceding the die.

8. The composition of claim 1 wherein said copolymers of ethylene with an alpha-olefin are selected from the group consisting of ethylene copolymers of propylene, butene-1, hexene-1, octene-1, decene-1, and octadecene.