聚合物中的添加剂是什么？

聚合物中的添加剂是什么？

What is an additive in a polymer?

一些物质通常会被添加到聚合物中，以调整或改善其外观和/或聚合物材料的物理化学性质。根据 REACH 法规第 3 条第 1 款，为保持聚合物稳定性所必需的添加剂必须被视为聚合物的一部分。根据 REACH 法规第 3 条第 1 款，任何其他未绑定的“添加剂”必须被视为混合物的成分，而不是添加剂。因此，如果添加剂是为了保持聚合物的稳定性而添加的，则含有添加剂的聚合物的进口商无需注册这些添加剂。但请注意，对于每年至少 1 吨的聚合物混合物进口物质，进口商有义务注册。单体和聚合物指南提供了详细的指南和实例。

Some substances are commonly added to polymers for the purpose of adjusting or improving their appearance and/or the physicochemical properties of polymeric material.Additives which are necessary to preserve the stability of a polymer must be regarded as a part of the polymer in accordance with Article 3(1) of REACH. Any other unbound "additive" must be regarded as a component of a mixture and not as an additive in accordance with Article 3(1) of REACH.Thus, the importer of a polymer containing additives does not need to register these additives provided that the additives are added to preserve the stability of the polymer. Note however that there is the general obligation to register substances imported in a polymer mixture in quantities of at least 1 tonne per year. Detailed guidance and practical examples are provided in the Guidance for monomers and polymers.