| 摘要 |
Provided is a soft polyolefin resin, which has an excellent melt tension as compared with a conventional resin, allows the production of foam having an excellent foaming magnitude and cell density, and maintains the properties unique to a thermoplastic resin during a foaming step. The soft polyolefin resin comprises: 65-95 wt% of a crystalline ethylene-propylene-butylene terpolymer segment having a long branch introduced thereto, which has a melt index of 0.1-10 g/10 min., an ethylene content of 0.5-10 wt%, a butylene content of 0.5-10 wt% and a melt strength of at least 200 mN; and 5-35 wt% of an elastic ethylene-propylene copolymer segment having an absolute viscosity of 0.5-5.0 dl/g and an ethylene content of 20-70 wt%.
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