Expandable polystyrene composition, expanded beads and...

Details Expandable polystyrene composition, expanded beads and... Expandable polystyrene composition, expanded beads and...

C - Chemistry, Metallurgy

08

J

C08J 9/06 (2006.01) C08J 9/00 (2006.01) C08J 9/20 (2006.01) C08K 5/01 (2006.01)

Patent

CA 2276314

The present invention relates to a homogeneous composition of an expandable styrene polymer in the form of beads comprising (a) 100 parts b.w. of a styrene polymer having a weight-average molecular mass of 150,000 to 300,000 and a residual monomer content of less than 2,000 ppm, (b) from 2 to 9 parts by weight of at least one blowing agent comprising n-pentane, (c) from 0.1 to less than 1.0 part by weight of a petroleum wax comprising a mixture of C18 to C80 alkanes, and (d) from 0 to 1.0 part by weight of a nucleating agent chosen from synthetic Fisher-Tropsch or polyolefin waxes. The composition allows the step of pre-expanding the beads to be improved by increasing the rate of expansion of the beads and by improving the productivity of the pre- expansion step, without substantially affecting the final moulding step.

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