Patent ID: 7683101
Filing Date: 2010-03-23
Classification: C08J

Abstract:
1. Pre-expanded beads of styrene-modified polyolefin-based resin comprising pre-expanded beads of a polyolefin-based resin modified with a polystyrene-based resin, wherein a styrene-based monomer forming a polystyrene-based resin in the beads is used in the range of 120 to 1,000 parts by weight relative to 100 parts by weight of a polyolefin-based resin, a bulk density of each bead is 0.012 to 0.20 g/cm 3 , and an absorbance ratio at 698 cm −1 and 2850 cm −1 (D 698 /D 2850 ) obtained from an infrared absorption spectrum of each bead surface measured by ATR method infrared spectroscopy is in the range of 0.1 to 2.5.