| 摘要 |
<p>The present invention relates to a thermoplastic composition of a vinylaromatic hydrocarbon polymer having a polymeric component and a fire-retarding component. For a total of 100 parts by weight, the composition comprises from 75 to 96 parts by weight of the polymeric component based on a (co)polymer (A) of a vinylaromatic hydrocarbon having a weight-average molecular mass from 150000 to 400000 and as a fire-retarding component, (1) from 2 to 10 parts by weight of at least one non-halogenated ester of orthophosphoric acid, and (2) from 2 to 15 parts by weight of at least one (co)polymer (B) of a vinylaromatic hydrocarbon, having a weight-average molecular weight from 2000 to 15000. The compositions exhibit good fire behaviour and have improved properties relating to processing or converting it into finished articles. The present invention relates also to a process and masterbatches to prepare the composition, and a process to improve especially the fire-retarding properties of a vinylaromatic polymer.</p> |
