US 12,168,741 B2
Urethane prepolymer, adhesive, multilayer body and synthetic leather
Ryo Kawamura, Chuo-ku (JP); Toshiki Yamada, Chuo-ku (JP); and Kazuya Sasaki, Chuo-ku (JP)
Assigned to DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD., Chuo-ku (JP)
Appl. No. 17/639,451
Filed by DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD., Chuo-ku (JP)
PCT Filed Aug. 24, 2020, PCT No. PCT/JP2020/031832
§ 371(c)(1), (2) Date Mar. 1, 2022,
PCT Pub. No. WO2021/044887, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 2019-162001 (JP), filed on Sep. 5, 2019.
Prior Publication US 2022/0325153 A1, Oct. 13, 2022
Int. Cl. C09J 175/06 (2006.01); C08G 18/10 (2006.01); C08G 18/32 (2006.01); C08G 18/42 (2006.01); C09J 7/32 (2018.01); D06N 3/14 (2006.01)
CPC C09J 175/06 (2013.01) [C08G 18/10 (2013.01); C08G 18/3206 (2013.01); C08G 18/4263 (2013.01); C09J 7/32 (2018.01); D06N 3/14 (2013.01); C09J 2467/006 (2013.01); D06N 2211/28 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An adhesive, consisting of a urethane prepolymer having an isocyanate group,
a viscosity at 100° C. of 30 to 600 dPa's before moisture curing, and
a thermal softening temperature after moisture curing of 75 to 155° C.,
wherein 10 to 55% of the total number of moles of the isocyanate group is sealed with a sealant,
wherein the sealant is at least one selected from the group consisting of aliphatic alcohols having 10 or more carbon atoms, aliphatic amines, alicyclic amines, aromatic amines, pyrazoles, and imidazoles,
wherein the urethane prepolymer is a reaction product of a polyol and a polyisocyanate, wherein the polyol is one polyol or a combination of two polyols, and
wherein the polyisocyanate is not 1,6-hexamethylene diisocyanate.