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US 2004/0204544 A1Published application
Process aid for melt processable polymers
AssigneeDuPont Dow Elastomers L.L.C.
InventorsGeorge Richard Chapman JR., Steven Richard Oriani
Life of this patent
Estimating the term…
Abstract
Extrusion processability of non-fluorinated melt-processable polymers is improved by introducing a fluoropolymer process aid by means whereby the weight average particle size of the fluoropolymer is greater than 2 microns as it reaches the extruder die entrance.
Claims11
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.
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Dependencies are inferred from the claim text.