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US 12,589,534 B2Granted
Polypropylene-based resin expanded beads and molded article thereof
AssigneeJsp Corporation
InventorHisashi Masumoto
Life of this patent
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Abstract
An expanded bead of polypropylene-based resin formed with a through hole that is defined by an inner peripheral surface and that has an average hole diameter of 1 mm or less. The expanded bead has a closed cell content of 85% or more, an average cell diameter of 50 to 300 μm and an inner surface portion that extends along the inner peripheral surface that has an average cell diameter of 5 to 150 μm which is smaller than the average cell diameter of the expanded bead.
Claims11
An expanded bead of polypropylene-based resin, comprising a through hole, and an inner peripheral surface defining said through hole,
- wherein
- said through hole has an average hole diameter d of 1 mm or less,
- said expanded bead has a closed cell content of 85% or more and an average cell diameter La of 50 μm or more and 300 μm or less, and
- said expanded bead has an inner surface portion that extends along the inner peripheral surface to a depth of 300 μm from the inner peripheral surface and that has an average cell diameter Li of 5 μm or more and 150 μm or less, wherein the average cell diameter Li of the inner surface portion is smaller than the average cell diameter La of the expanded bead.
1 more element
Dependencies are inferred from the claim text.