Abstract
15 kinds of pigments on the market have been tested to study the influence of pigments upon thermal degradation of polypropylene. The result indicates that the effects of pigments are so remarkable that careful attention is necessary in practical use. Furthermore, the degradation effect was studied in the same way for various metals and their chlorides and oxides, and it was concluded that this effect could be explained by considering the catalytic effects of metals contained in pigments since both results, mentioned above, had a correlation between them. Furthermore, the interactions between pigments and various kind of stabilizers were studied.
