| 摘要 |
Mono- or bistetrazoles of the formula I <IMAGE> (I) wherein n is 1 or 2, R1 represents hydrogen or a monovalent hydrocarbon radical and R represents a monovalent or divalent hydrocarbon radical which can be interrupted by oxygen, NY, sulfur, SO2 and/or CO2 or substituted by OH or SH, and wherein Y represents hydrogen or a monovalent hydrocarbon radical. These compounds, especially when used in combination with epoxy plasticizers and/or metal salt stabilizers, are outstanding heat stabilizers for chlorine-containing thermoplastics, especially for PVC. Particular interest attaches to the combinations of tetrazoles with epoxy plasticizers, for example epoxidized soya bean oil, which constitute a metal-free stabilizer system. |
