Process for the production of expanded foam particles made of a granule comprising at least a biodegradable polyester, expanded particle foam, process for the production of a piece of mould, this piece of mould, the use of such mold

摘要

The invention relates to a process for the production of expanded foam particles made of a granule comprising at least a biodegradable polyester, comprising the following steps: (I) the production of a suspension that contains a granule in a means of suspension, and (II) The granule in suspension from step (I) with at least one physical agent expansion.In order to obtain a granule laden with expansion agents in suspension, while the mixture is heated under agitation until the temperature of the relaxation IMT, (III) relaxation of the suspension obtained in step (II) after the end of the retention time and the cooling of the suspension relaxed A watery liquid cooling to obtain particulate expanded foam.The process is conducted in an aqueous suspension, the blowing agent in the stage I or in step II is added during the stage of heating or immediately after the warm-up phase and in phase II, the suspension after the heating is maintained for 3 to 100 minutes.At a temperature ranging between IMT and IMT and - 5 u00b0 C and + 2 u00b0 C and the ratio of the quantity of the cooling medium in the middle of the suspension is at least 0,3.