Milling process

摘要

The invention pertains to a process for cryogenic milling mixtures of (per)fluoroelastomers and semicrystalline thermoplastic VDF polymers, and to free-flowing micronized pellets obtainable therefrom, said micronized pellets advantageously yielding, after extrusion and compounding, excellent mechanical properties, even improved over those of base fluoroelastomer matrix.

主权项

1. A process for manufacturing micronized pellets of a (per)fluoroelastomer composition, said process comprising milling a composition consisting essentially of at least one (per)fluoroelastomer (A) and at least one thermoplastic semicrystalline vinylidene fluoride polymer (F) at a temperature below glass transition temperature of said (per)fluoroelastomer, wherein the micronized pellets, after 24 hours of storage at room temperature, have a pourability of less than 60 s when measured according to ASTM D1895 standard, using the funnel of Test method B and the cylinder of Test Method A, when measured at room temperature.