US 11,840,802 B2
Porous layer structure and method for producing same
Ryo Kawamura, Kodaira (JP); Toshiki Yamada, Kita-ku (JP); and Kazuya Sasaki, Abiko (JP)
Assigned to DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD., Chuo-ku (JP)
Appl. No. 17/278,488
Filed by DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD., Chuo-ku (JP)
PCT Filed Sep. 20, 2019, PCT No. PCT/JP2019/037046
§ 371(c)(1), (2) Date Mar. 22, 2021,
PCT Pub. No. WO2020/066920, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-180057 (JP), filed on Sep. 26, 2018.
Prior Publication US 2022/0034027 A1, Feb. 3, 2022
Int. Cl. D06N 3/14 (2006.01); D06N 3/00 (2006.01)
CPC D06N 3/14 (2013.01) [D06N 3/0036 (2013.01); D06N 3/0043 (2013.01); D06N 2211/28 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A porous layer structure, comprising:
a base material and
a urethane foam layer provided on the base material,
wherein the urethane foam layer is a foam layer formed by foaming a urethane prepolymer having an isocyanate group, the urethane foam layer has a density of from 0.10 to 0.60 g/cm3, and the urethane prepolymer substantially contains no volatile component and satisfies at least any one of compositions (A) to (C):
(A) a composition comprising a polyol component (a) having a gel point of 20 ml or more and less than 30 ml in an amount of 50% by mass or more based on all polyol components;
(B) a composition comprising a polyol component (b) having a gel point of 30 mL or more and less than 50 mL in an amount of 30% by mass or more based on all polyol components; and
(C) a composition comprising a polyol component (c) having a gel point of 50 mL or more in an amount of 10% by mass or more based on all polyol components.