METHODS FOR REGULATING THE FREE EXPLOITATION INDEX IN AN IMPRESSIBLE POLYSTYRENE

摘要

A method comprising operating a high impact polystyrene (HIPS) producing reaction system, which comprises an installation for removing volatiles downstream of the polymerization reactor and from which the HIPS product is obtained, and introducing an antioxidant into the HIPS reaction system before the installation for removing volatiles, the antioxidant being one or more aromatic antioxidants. The HIPS product is obtained by operating the HIPS reaction system to produce the HIPS product, wherein the HIPS reaction system comprises a volatiles removal unit downstream of the polymerization reactor and includes introducing an antioxidant into the HIPS reaction system prior to the volatiles removal unit, the antioxidant comprising one or more aromatic antioxidants. The antioxidant may contain at least one thiol group and / or at least one cresol group. In addition, a system for producing a HIPS product is provided.