Abstract: Process for the separation of volatile material from particulate polyolefin comprising: (a) feeding the particulate polyolefin to a purge vessel, optionally causing it to move through the vessel in substantially plug-flow mode, (b) heating the particulate polyolefin in the purge vessel to a temperature greater than 30° C. but insufficiently high to cause the particles to become agglomerated, and/or maintaining the polyolefin at a temperature in this range in the purge vessel, (c) feeding air to the purge vessel counter-current to the movement of the particulate polyolefin to remove volatile material therefrom, (d) transferring the particulate polyolefin from the purge vessel to a cooling vessel wherein the particulate polyolefin moves through a cooling zone where it cools to the desired temperature and (e) removing the particulate poly-olefin from the cooling vessel, wherein the particulate polyolefin is a functionalized polyolefin.