US 11,912,859 B2
Epoxy resin composition, prepreg, and fiber-reinforced composite material
Daisuke Konishi, Aichi (JP); Yuichi Yamakita, Ehime (JP); Noriyuki Hirano, Ehime (JP); and Eiki Takahashi, Ehime (JP)
Assigned to TORAY INDUSTRIES, INC., Tokyo (JP)
Appl. No. 16/973,768
Filed by TORAY INDUSTRIES, INC., Tokyo (JP)
PCT Filed Jun. 17, 2019, PCT No. PCT/JP2019/023850
§ 371(c)(1), (2) Date Dec. 10, 2020,
PCT Pub. No. WO2019/244829, PCT Pub. Date Dec. 26, 2019.
Claims priority of application No. 2018-115109 (JP), filed on Jun. 18, 2018; application No. 2018-115110 (JP), filed on Jun. 18, 2018; application No. 2018-115111 (JP), filed on Jun. 18, 2018; and application No. 2018-138178 (JP), filed on Jul. 24, 2018.
Prior Publication US 2021/0253843 A1, Aug. 19, 2021
Int. Cl. C08L 63/00 (2006.01); C08J 5/24 (2006.01)
CPC C08L 63/00 (2013.01) [C08J 5/243 (2021.05); C08J 5/249 (2021.05); C08J 2363/00 (2013.01); C08J 2463/00 (2013.01); C08J 2481/06 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01)] 3 Claims
 
1. An epoxy resin composition comprising:
a component [A] being a trifunctional amine type epoxy resin;
a component [D] including a component [D]-2, the component [D]-2 being an isocyanuric acid type epoxy resin;
a component [E] being a sorbitol type epoxy resin; and
a component [F] being dicyandiamide or a derivative of dicyandiamide,
wherein all of a condition 8, a condition 9, and a condition 10 described below are satisfied,
the condition 8 being that a resin cured product produced by reacting the epoxy resin composition at 130° C. for 90 minutes has a flexural modulus of 4.3 GPa or more,
the condition 9 being that the resin cured product produced by reacting the epoxy resin composition at 130° C. for 90 minutes has a bending strength of 190 MPa or more,
the condition 10 being that the epoxy resin composition includes the component [A] and the component [E] at a total content of 40 parts by mass or more based on 100 parts by mass of all epoxy resins in the epoxy resin composition, and
the component [E] is included at a content of 25 to 40 parts by mass based on 100 parts by mass of all the epoxy resins.