Expanded particles and expanded molded article
AssigneeSekisui Kasei Co., Ltd.
InventorsKohei TAZUMI, Daichi KAGEYAMA, Mayumi ANDO
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Abstract
The present invention relates to expanded particles and an expanded molded article. More specifically, the present invention relates to expanded particles comprising a polycarbonate-based resin as a base resin, which has a specified cell density X and a specified average cell wall thickness, as well as an expanded molded article. In addition, the present invention relates to expanded particles comprising a polycarbonate-based resin as a base resin, which has a specified bulk ratio and a specified average cell diameter, as well as an expanded molded article.
Claims15
Expanded particles comprising a polycarbonate-based resin as a base resin,
- wherein said expanded particles have
- (i) a cell density X of 1.0×106 pieces/cm3 or more and less than 1.0×108 pieces/cm3
- [a cell density X is calculated by the following expression:
- cell density X=(ρ/D−1)/{(4/3)·π·(C/10000/2)3}
- (wherein C represents an average cell diameter (μm), ρ represents the density (kg/m3) of a polycarbonate-based resin, D represents an apparent density (kg/m3) of expanded particles)], and
- (ii) an average cell wall thickness of 1 to 15 μm.
Expanded particles comprising a polycarbonate-based resin as a base resin,
- wherein when an average cell diameter of said expanded particles is divided by a bulk ratio of said expanded particles, said expanded particles have a value within a range of 2.5 to 12 μm/times.
An expanded molded article obtained from a plurality of expanded particles comprising a polycarbonate-based resin as a base resin,
- wherein when a value of a maximum point stress of a bending test at four points is measured at each temperature of −40° C., 23° C., 80° C., and 140° C., and an average of said value of a maximum point stress of a bending test at four points is calculated, said expanded molded article shows a variability rate of said value of a maximum point stress of a bending test at four points to said average within a range of 0 to 50%.
Dependencies are inferred from the claim text.