US 11,753,500 B2
Epoxy resin solution
Ayumi Yanaka, Uji (JP); Yumeto Fukubayashi, Uji (JP); and Takatoshi Murakami, Uji (JP)
Assigned to UNITIKA LTD., Amagasaki (JP)
Appl. No. 17/426,228
Filed by UNITIKA LTD., Amagasaki (JP)
PCT Filed Jan. 21, 2020, PCT No. PCT/JP2020/001838
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/158493, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 2019-016291 (JP), filed on Jan. 31, 2019; and application No. 2019-108755 (JP), filed on Jun. 11, 2019.
Prior Publication US 2022/0106435 A1, Apr. 7, 2022
Int. Cl. C08G 59/40 (2006.01); C08G 59/42 (2006.01); C08L 63/00 (2006.01); C08J 5/24 (2006.01); B32B 27/38 (2006.01); C08G 59/02 (2006.01); C08G 59/22 (2006.01); C08G 59/32 (2006.01); C08J 5/04 (2006.01)
CPC C08G 59/4042 (2013.01) [C08G 59/022 (2013.01); C08G 59/22 (2013.01); C08G 59/32 (2013.01); C08G 59/4238 (2013.01); C08J 5/04 (2013.01); C08J 5/249 (2021.05); C08L 63/00 (2013.01); C08J 2367/00 (2013.01); C08L 2201/08 (2013.01); C08L 2203/20 (2013.01)] 10 Claims
 
1. An epoxy resin solution containing at least a curing agent and an epoxy resin mixed in an organic solvent, wherein the curing agent comprises an imide group-containing curing agent,
wherein the imide group-containing curing agent is a diimide dicarboxylic acid-based compound having a structure of following general formula (1),
wherein a total formulating amount of the imide group-containing curing agent and the epoxy resin is from 50 to 70% by mass based on a total amount of the epoxy resin solution, and
wherein a reaction rate of a glycidyl group contained in the epoxy resin in the epoxy resin solution is 10% or less,

OG Complex Work Unit Chemistry
in the general formula (1), X1 and X2 each independently represent a structure derived from an aromatic tricarboxylic acid anhydride component, an alicyclic tricarboxylic acid anhydride component, or an aliphatic tricarboxylic acid anhydride component; and R1 represents a structure derived from an aromatic diamine component containing 1 to 2 aromatic rings, an alicyclic diamine component, or an aliphatic diamine component.
 
9. A prepreg, wherein the epoxy resin solution of claim 1 is impregnated into or applied to a reinforcing fiber cloth.
 
10. A laminated body, comprising the prepreg of claim 9 being laminated.