	US 12,435,176 B2
	Curable resin composition
Keisuke Ota, Kuki (JP); Masato Inadome, Kuki (JP); Yukako Ishigami, Kuki (JP); Ryo Ogawa, Kuki (JP); and Tamotsu Nagamatsu, Kuki (JP)
Assigned to ADEKA CORPORATION, Tokyo (JP)
Appl. No. 17/288,372
Filed by ADEKA CORPORATION, Tokyo (JP)
PCT Filed Nov. 7, 2019, PCT No. PCT/JP2019/043676 § 371(c)(1), (2) Date Apr. 23, 2021, PCT Pub. No. WO2020/095995, PCT Pub. Date May 14, 2020.
Claims priority of application No. 2018-210877 (JP), filed on Nov. 8, 2018.
Prior Publication US 2021/0380749 A1, Dec. 9, 2021
Int. Cl. C08G 18/00 (2006.01); C08G 18/10 (2006.01); C08G 18/28 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01); C08G 18/66 (2006.01); C08G 18/80 (2006.01); C08G 59/14 (2006.01); C08L 75/04 (2006.01); C09J 163/00 (2006.01); C09J 175/08 (2006.01)

CPC C08G 18/003 (2013.01) [C08G 18/10 (2013.01); C08G 18/2815 (2013.01); C08G 18/3221 (2013.01); C08G 18/4829 (2013.01); C08G 18/4854 (2013.01); C08G 18/6677 (2013.01); C08G 18/80 (2013.01); C08L 75/04 (2013.01); C09J 163/00 (2013.01); C09J 175/08 (2013.01); C08G 59/14 (2013.01); C08G 2170/00 (2013.01)]

10 Claims

1. A curable resin composition comprising an epoxy resin (A), blocked urethane (C), and an amine-based latent curing agent (D),

wherein the blocked urethane (C) is obtained by reacting a urethane polymer having a terminal isocyanate group with a blocking agent (C-4), the urethane polymer being obtained by reacting a polyisocyanate (C-1), a diol (C-2), and a branching agent (C-3) containing at least three groups that react with an isocyanate group,

the ratio (number of NCO groups/number of NCO reactive groups) between the number of moles of isocyanate groups in the component (C-1) (number of NCO groups) and the total number of moles of hydroxyl groups in the component (C-2) and groups that react with an isocyanate group in the component (C-3) (number of NCO reactive groups) is from 1.4 to 1.6, and

the proportion of the number of moles of groups that react with an isocyanate group in the component (C-3) is from 10 to 41% of the total number of moles of hydroxyl groups in the component (C-2) and groups that react with an isocyanate group in the component (C-3), and

wherein the component (C-3) is at least one member selected from the group consisting of a propylene oxide adduct of glycerin and a propylene oxide adduct of trimethylolpropane.