| 摘要 |
<p>The present invention relates to a process for the production of an expandable polystyrene, in particular an expandable polystyrene which comprises at least a primary flame retardant additive and a secondary flame retardant additive, said process comprising:
(1) mixing a formed polystyrene (a) with a first masterbatch of one or more additives other than flame retardant additives and (b) with a blowing agent, at a temperature of at least 175°C to form a blended melt,
(2) mixing said blended melt with the primary flame retardant additive at temperature of less than 175°C,
(3) subsequently mixing said melt with the secondary flame retardant additive at a temperature of less than 150°C, and
(4) granulating the final blended polystyrene.</p> |
