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US 7,001,951 B2Granted
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.
Claims15
A process aid composition for use in an extrudable non-fluorinated melt processable polymer at an extrusion temperature, said process aid composition comprising:
- A) at least 1 weight percent, based on total weight of said process aid composition, of a fluoroelastomer having a Mooney viscosity, measured per ASTM D1646 at 121° C., large rotor, condition ML 1+10 minutes, of 60 to 80;
- and
- B) at least 1 weight percent, based on total weight of said process aid composition, of an interfacial agent in an amount no more than a 5:1 weight ratio of interfacial agent to fluoroelastomer, said interfacial agent being a thermoplastic polymer chemically distinct from said fluoroelastomer and said interfacial agent having a melting point less than said extrusion temperature.
Dependencies are inferred from the claim text.