| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase the expansion ratio and achieve excellent lightness and thermal insulation, while attaining sufficient impact resistance. <P>SOLUTION: The base resin is a mixture of a polypropylene resin, a styrene-ethylene/butylene-styrene block copolymer and a polyethylene resin. The polypropylene resin has a long chain branched structure and is blended in a blend ratio of 60-80 wt.% of the base resin. The styrene-ethylene/butylene-styrene block copolymer has a styrene content of 15-40% and the blending ratio thereof is 15-35 wt.% of the base resin. The polyethylene resin has a long chain branched structure and a density of 0.930 g/cm<SP POS="POST">3</SP>or less and the blending ratio thereof is 5-25 wt.% of the base resin. <P>COPYRIGHT: (C)2013,JPO&INPIT |
