Patent ID: 7060788
Filing Date: 2006-06-13
Classification: B01D,B01F,B29B,C08F

Abstract:
1. A process for stripping volatile constituents from polymer melts comprising introducing the melt into a horizontally oriented cylindrical device having a length to diameter ratio of 0.6 to 2.5 that contains a plurality of perforated disks rotating about a common horizontally oriented, externally driven shaft bringing the melt and disks into contact in a manner calculated to constantly renew the surface of the melt to be stripped, wherein the perforated disks have equal-sized holes having a common size A conforming to A=x (η 2 /( kg 2 m −5 s −2 )) 1/3 wherein x is 2·10 −3 to 3·10 −2 and η is the kinematic melt viscosity in Pas.