Polymer additives - Additive blend - Plastic Industry | Adeka Palmarole

ABSTRACT:

Smart stabilization of polyolefins has been achieved by “in-situ reactor stabilization technology”, in which an aryloxide derived from phenolic antioxidant with aluminum alkyls was directly fed into polymerization stage of polyolefins. An aryloxide based on special phenolic antioxidant was found to disperse quite evenly into polyolefin powders, and at finishing stage, the aryloxide was easily decomposed to re-generate the phenolic antioxidant. The re-generated phenolic antioxidant was demonstrated to give excellent stabilization performance at one-tenth concentration of the amount of antioxidants typically loading today during pelletization/compounding stage of the polymer production process. Most importantly, no negative interaction on the catalytic polymerization behavior, e.g., catalyst yield (activity), stereospecificity, molecular weight and polydispersity, bulk density of powders, etc was observed. The polymers obtained using the in-situ stabilization technology with the remarkable lower loading of antioxidant are considered more ‘green’ due to additive savings and safer for food contact applications since ‘less in = less out’ with respect to extraction of phenols etc. Furthermore, in-situ stabilization technology allows facile stabilization of melt blow moulding grades which are typically difficult to pelletize due to higher melt flow rate. It is believed that this kind of in-situ stabilization technology will complement post-polymerisation technology to afford optimal stabilization packages for the next generation of polyolefins.

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