US 11,913,167 B2
Method for manufacturing synthetic leather
Hidetoshi Kajihara, Hokkaido (JP); Yukio Honda, Tokyo (JP); and Tomoyuki Yabe, Tokyo (JP)
Assigned to DAIICHI KASEI CO., LTD, Tokyo (JP); and KAJIHARA DESIGN STUDIO INC, Hokkaido (JP)
Appl. No. 17/606,147
Filed by DAIICHI KASEI CO., LTD., Tokyo (JP); and KAJIHARA DESIGN STUDIO INC, Hokkaido (JP)
PCT Filed Jan. 20, 2021, PCT No. PCT/JP2021/001769
§ 371(c)(1), (2) Date Oct. 25, 2021,
PCT Pub. No. WO2021/157351, PCT Pub. Date Aug. 12, 2021.
Claims priority of application No. 2020-019859 (JP), filed on Feb. 7, 2020.
Prior Publication US 2022/0195661 A1, Jun. 23, 2022
Int. Cl. D06N 3/14 (2006.01); B32B 27/12 (2006.01); B32B 27/40 (2006.01); B32B 38/06 (2006.01); D06P 1/34 (2006.01); D06P 1/52 (2006.01)
CPC D06N 3/14 (2013.01) [B32B 27/12 (2013.01); B32B 27/40 (2013.01); B32B 38/06 (2013.01); D06P 1/34 (2013.01); D06P 1/5285 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for manufacturing synthetic leather having a skin layer on a base cloth, comprising steps of:
(i) coating a mold-releasable substrate with a skin layer composition containing a natural dye and a polyurethane resin and drying the composition to form a skin layer; and
(ii) laminating the skin layer on a base cloth;
wherein the dye is in the form of a dye powder or in both the forms of a dye extract and a dye powder so as to be mixed with the polyurethane resin in step (1).