Summary: A process for the solid state polycondensation of PET is proposed. It is shown that by correctly choosing the prepolymerisation conditions it is possible to crystallise the product and to directly polymerise it in a dispersed phase. This process is significantly faster than the “standard” PET processes, and allows one to obtain high molecular weights directly from a prepolymer without the need to use an intermediate solution polymerisation step. Reactor set‐up for precursor preparation and dispersed phase prepolymerisation. magnified image Reactor set‐up for precursor preparation and dispersed phase prepolymerisation.
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Gantillon et al. (2004) studied this question.