epsilon-caprolactone has been polymerized in bulk in a mini-extruder with Al(OiPr)(3) as initiator and benzyl alcohol as transfer agent. Polymer chains have been characterized by H-1 NMR, SEC and Maldi-Tof mass spectroscopy in order to investigate the potentialities of this process in terms of macromolecular engineering. Low temperatures around 75degreesC are enough to perform oligomerization at high conversion with a mean residence time less than 2 minutes. All the polymer chains are actually functionalized by the chemical group issued from the transfer agent. Molecular weight distribution depends on the temperature as well as on the residence time.