	US 12,404,383 B2
	Foam and method for manufacturing foam
Yasuhiro Kawaguchi, Yamaguchi (JP); Yusaku Uchiyama, Yamaguchi (JP); Takehisa Sugaya, Yamaguchi (JP); and Katsuhiro Nakazato, Yamaguchi (JP)
Assigned to SEKISUI CHEMICAL CO., LTD., Osaka (JP)
Appl. No. 17/634,060
Filed by SEKISUI CHEMICAL CO., LTD., Osaka (JP)
PCT Filed Sep. 7, 2020, PCT No. PCT/JP2020/033800 § 371(c)(1), (2) Date Feb. 9, 2022, PCT Pub. No. WO2021/059945, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-177564 (JP), filed on Sep. 27, 2019.
Prior Publication US 2022/0325062 A1, Oct. 13, 2022
Int. Cl. C08J 9/32 (2006.01); B29C 48/00 (2019.01); B29K 101/12 (2006.01)

CPC C08J 9/32 (2013.01) [B29C 48/0012 (2019.02); B29C 48/022 (2019.02); B29K 2101/12 (2013.01); C08J 2205/052 (2013.01); C08J 2205/10 (2013.01); C08J 2300/22 (2013.01); C08J 2300/26 (2013.01)]

6 Claims

1. A foam comprising cells dispersed in an elastomer resin,

the cells having an average diameter of 40 to 60 μm and an average circularity of 0.990 or greater,

wherein the foam has a thickness of 300 μm or greater,

the foam has a surface layer that is a portion from a surface to a depth of 100 μm and a center portion that is a portion other than the surface layer,

the cells in the surface layer have an average circularity of 0.980 or greater,

the cells in the center portion have an average circularity of 0.990 or greater, and

the average circularity is a value obtained by cutting the foam to provide a cross section, subjecting the cross section to an image analysis and measuring a circularity of multiple cells, and then averaging the measured circularities of the multiple cells.