| 摘要 |
The composition allows to improve the productivity of the stage of previous expansion of the pearls by increasing the velocity of their expansion, without being considerably affected by the end stage of moulding. The homogenous composition of expanding styrene polymer is in the form of pearls and includes 100 wt. %. styrene polymer with mean weight of the molecular mass of from 150,000 to 300,000and the content of residual monomer of less than 2000 ppm, from 2 to 9 wt. pt. Of at least one pore-forming means, including n-pentane, from 0.1 to less than 1.0 wt. pt. naphthene wax consisting of amixture of C18 to C80 alkanes, and 0-1.0 wt. pt. of nucleophilic means selected from synthetic Fisher-Tropsch or polyolefin wax. |
