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In-mold foaming article of polypropylene resin composition

  • US 6,326,409 B1
  • Filed: 10/24/2000
  • Issued: 12/04/2001
  • Est. Priority Date: 11/05/1999
  • Status: Active Grant
First Claim
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1. An in-mold foaming article of propylene resin composition having a density of 90 to 300 g/L and an open cell ratio of at most 12% obtained by molding a pre-foamed particle, wherein the pre-foamed particle comprises a resin composition containing (A) 100 parts by weight of polypropylene resin and (B) 0.01 to 20 parts by weight of a hydrophilic polymer as a base material resin, and water as a foaming agent, and the pre-foamed particle has at least two endothermic peaks in a DSC curve obtained in differential scanning calorimetry.

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