| 摘要 |
Object: to obtain a stabiliser for rigid and semirigid PVC free from heavy metals (Ba, Cd, Pb, Sn) and zinc, with excellent thermal stability and good colour fastness. Constitution: the composition comprises as fundamental component a) a substance selected from the group consisting of crystalline hydrotalcites, crystalline or amorphous zeolites previously treated with perchloric acid or metal perchlorates, b) a carboxylated metallic salt with M belonging to alkaline or alkaline earth groups in association with substances belonging to c) a group of organic costabilisers and to d) a group of antioxidants. |
