Solid State Polymerization (SSP)
We can increase the molecular weight of your polyester to any required level
Solid State Polymerization (SSP) is an important step, frequently used after melt-polymerization or extrusion for the purpose of enhancing the mechanical and rheological properties of polymers before injection blow molding or extruding. SSP is a process done at high temperatures and at zero oxygen level with nitrogen purging or at deep vacuum, to achieve a desired high molecular weight polyester of uniform and consistent intrinsic viscosity. Increasing the Intrinsic Viscosity (IV) through a solid state polymerization (SSP) process will generally result in a higher added value of the polyester.
Most applications require a high IV polyester in order to increase the end product’s mechanical properties. In our processes we can increase the IV to a maximum of 1.5dl/g.
Usage of recycled content
SSP is an diffusion process to remove polycondensation reaction products and at the same time the volatile contaminants can be removed. That is why it is suitable for processing recycled bottle grade flakes of polyethylene terephthalate (rPET) into food contact approved polyesters.
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