Patent ID: 6454983
Filing Date: 2002-09-24
Classification: C08K

Abstract:
A process for single screw extrusion of a polymer composition comprising a copolyester and a quaternary ammonium salt having thermal stability at a temperature greater than 200Â° C., wherein the quaternary ammonium salt is present in an amount ranging from greater than 0.5 to about 10 weight percent, based on the total composition, comprising:(a) passing the copolyester composition through a feed zone of a single screw extruder, the feed zone being maintained at a temperature no greater than 385Â° F.; (b) thereafter passing the resulting composition from (a) through a compression zone of the single screw extruder, the compression zone being maintained at a temperature ranging from about 392Â° F. to about 572Â° F.; (c) thereafter passing the resulting composition from (b) through a metering zone of the single screw extruder, the metering zone being maintained at a temperature ranging from about 392Â° F. to about 572Â° F.; and (d) thereafter passing the resulting composition from (c) through a die which is maintained at a temperature ranging from about 392Â° F. to about 572Â° F.