Phenol vs. Phenol Free Stabilization and the Impact of Selected Grades of TiO2, 2007 PLACE Conference

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The preservation of physical properties and aesthetics are two key measures for film products. As such, one needs to be selective in terms of choosing the polymer and stabilization systems that are used to derive robust and attractive film products. For most applications, traditional stabilization systems provide the appropriate level of physical property retention, good processability, and long term thermal stability without compromising the overall aesthetic appearance of the film product. In selected applications, however, it is desirable to have film products that do not discolor during processing; and more importantly, while the product is kept in storage. Under a selected set of circumstances, certain types of phenolics have been shown to be susceptible to discoloration, due to various factors; some of which can be controlled, others not. For example, inadequate stabilizer concentrations, harsh processing conditions, improper selection of white pigments (TiO₂), and/or prolonged storage of the films in an environment containing oxides of nitrogen (pollution).