US 12,305,014 B2
Expanded particles and expanded molded article
Kohei Tazumi, Osaka (JP); Daichi Kageyama, Osaka (JP); and Mayumi Ando, Osaka (JP)
Assigned to SEKISUI KASEI CO., LTD., Osaka (JP)
Appl. No. 17/278,887
Filed by SEKISUI KASEI CO., LTD., Osaka (JP)
PCT Filed Sep. 23, 2019, PCT No. PCT/IB2019/058012
§ 371(c)(1), (2) Date Mar. 23, 2021,
PCT Pub. No. WO2020/065485, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-185200 (JP), filed on Sep. 28, 2018; application No. 2019-058518 (JP), filed on Mar. 26, 2019; application No. 2019-064060 (JP), filed on Mar. 28, 2019; application No. 2019-067036 (JP), filed on Mar. 29, 2019; and application No. 2019-141409 (JP), filed on Jul. 31, 2019.
Prior Publication US 2022/0010089 A1, Jan. 13, 2022
Int. Cl. C08J 9/18 (2006.01); C08J 9/12 (2006.01); C08J 9/228 (2006.01)
CPC C08J 9/18 (2013.01) [C08J 9/228 (2013.01); C08J 2205/052 (2013.01); C08J 2369/00 (2013.01)] 13 Claims
OG exemplary drawing
 
4. Expanded particles comprising a polycarbonate-based resin as a base resin, wherein said expanded particles have (i) a cell density X of 1.0×107 pieces/cm3 or more and less than 7.6×107 pieces/cm3 where the 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, and D represents an apparent density (kg/m3) of expanded particles, and (ii) an average cell wall thickness of 1 to 15 μm, wherein said average cell diameter C is 20 to 200 μm, said expanded particles have a bulk ratio of 2 to 20 times, and wherein when said average cell diameter of said expanded particles is divided by said bulk ratio of said expanded particles, said expanded particles have a value within a range of 3.0 to 10.0 μm/times.