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Polymer Additives

Polymer Stabilization: Developments and Evaluations

SpecialChem / Apr 17, 2001

Recent developments in polymer stabilization are always a core element of Rapra Technology's annual plastics additives conference Addcon, held recently in Basel, Switzerland. This article reports on some of the stabilizers discussed and some methods of assessing their effectiveness. GE Specialty Chemicals reported the development of new amine stabilizers for polypropylene. The company reported that a key feature of Genox EP™ is that they can be used in single component formulations, which can combat the effects of thermo-oxidative degradation during melt processing in polypropylene. Multicomponent blends are often required to overcome feeding irregularities and achieve the right phosphite/phenolic ratio. This assists additive dosing and can improve operating efficiency. The new materials are amine oxides and GE Specialty Chemicals says that it tested Genox EP against several conventional type formulations in multiple pass extrusions. The material is not hygroscopic, is inherently resistant to hydrolysis and is essentially insoluble in water.

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