| 摘要 |
PROBLEM TO BE SOLVED: To provide an open-cell foam of a polyethylene resin composition having a high open cell ratio and excellent recyclability and capable of exhibiting sufficient stress relaxing properties and simultaneously satisfying a small compression set. SOLUTION: This open-cell foam of the polyethylene resin composition is a foam having >=50% open cell ratio, comprises a substrate resin containing >=5 and <50 wt.% of the polyethylene resin composition and has >=30% stress relaxation ratio after passage of 1 min from fixing of the foam at 50% compression, 1-50 kPa compression stress at 25% strain and <=70% compression set at 50% thickness. The open-cell foam has sufficient stress relaxing properties and a small compression set and is capable of causing stress relaxation in the interior of the foam in an early stage together with the passage of time, increasing a contact area with a heavy good, avoiding a further concentrated load and dispersing and supporting the pressure of the heavy good even if the concentrated load is produced in the foam when the heavy good in an indeterminate form of a constant weight is placed on the foam.
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