	US 11,884,804 B2
	Foam body, polyolefin-based foam sheet, and complex
Tomoya Matayoshi, Ichihara (JP); Takayuki Watanabe, Chiba (JP); Michio Eriguchi, Chiba (JP); and Satoshi Noma, Ichihara (JP)
Assigned to MITSUI CHEMICALS, INC., Tokyo (JP)
Appl. No. 16/481,627
Filed by Mitsui Chemicals, Inc., Tokyo (JP)
PCT Filed Feb. 2, 2018, PCT No. PCT/JP2018/003610 § 371(c)(1), (2) Date Jul. 29, 2019, PCT Pub. No. WO2018/143411, PCT Pub. Date Aug. 9, 2018.
Claims priority of application No. 2017-017820 (JP), filed on Feb. 2, 2017; and application No. 2017-219449 (JP), filed on Nov. 14, 2017.
Prior Publication US 2019/0382572 A1, Dec. 19, 2019
Int. Cl. C08L 23/20 (2006.01); C08J 9/12 (2006.01); C08J 9/08 (2006.01)

CPC C08L 23/20 (2013.01) [C08J 9/08 (2013.01); C08J 9/122 (2013.01); C08J 2201/03 (2013.01); C08J 2203/06 (2013.01); C08J 2207/10 (2013.01); C08J 2323/20 (2013.01); C08L 2203/14 (2013.01)]

5 Claims

1. A polyolefin-based uncrosslinked foam sheet comprising:

70% by mass or more and 90% by mass or less of a 4-methyl-1-pentene-based polymer including a constitutional unit derived from 4-methyl-1-pentene (A1) and a constitutional unit derived from an α-olefin having 2 to 3 carbon atoms (A2), and

5% by mass or more and 30% by mass or less of a foamable modified resin, wherein the foamable modified resin is at least one selected from the group consisting of thermoplastic polyamide-based resins, hydrogenated styrene-based elastomers, acrylic acid, methacrylic acid or maleic acid-modified thermoplastic polyamide-based resins and acrylic acid, methacrylic acid or maleic acid-modified hydrogenated styrene-based elastomers,

wherein a maximum peak height (Rp) of at least one surface of the polyolefin-based uncrosslinked foam sheet, which is measured according to JIS B0601:2001, is 67 μm or more and 190 μm or less,

wherein when a Shore A hardness of at least one surface of the polyolefin-based uncrosslinked foam sheet immediately after measurement, which is measured at 23° C. according to JIS K6253, is HS₀, and a Shore A hardness 15 seconds after the measurement is HS₁,

ΔHS expressed by (HS₀−HS₁) is 30 or more and 60 or less; and

HS₀is 54 or more and 68 or less,

wherein a total of the constitutional unit (A1) derived from the 4-methyl-1-pentene and the constitutional unit (A2) derived from the α-olefin having 2 to 3 carbon atoms is 100 mol %, a content of the constitutional unit (A1) is 72 mol % or more and 90 mol % or less and a content of the constitutional unit (A2) is 10 mol % or more and 28 mol % or less, and

wherein one or more temperatures showing a maximum value of loss tangent (tan δ) of dynamic viscoelasticity of the polyolefin-based uncrosslinked foam sheet exist in at least a range of 10° C. or higher and 40° C. or lower, and the maximum value of the loss tangent is 0.8 or more and 3 or less.