| 摘要 |
<p>Expandable modified styrene resin beads (d) produced by incorporating a foaming agent (e) into modified styrene resin beads (c) made of a composition comprising a continuous phase of a styrene resin and rubbery polymer particles (b) dispersed therein, wherein the rubbery polymer particles (b) are dispersed in the continuous phase either in a uniform state over the whole of each bead (d) or in such a state that the density of the rubbery polymer particles (b) in the central part of each bead (d) is higher than that in the surface part thereof, and the modified styrene resin beads (c) are ones produced by copolymerizing styrene polymer beads (a) with a monomer mixture essentially comprising a styrenic major monomer and a conjugated diene minor monomer in such a state that the beads (a) are impregnated with the monomer mixture.</p> |
