Expandable polystyrene particles and foams therefrom

摘要

A foamed article is obtained by expanding particles obtainable by a graft polymerization of a styrene type monomer onto cis-rich polybutadiene using a blowing agent containing n-pentane as its main component; the foamed article shows a density of 0.015 - 0.040 g/cm<3>, an average cell diameter of 60 - 300 micrometers and a closed cell foam rate of not less than 50%.