US 12,460,044 B2
Epoxy resin composition, prepreg, and fiber reinforced composite material
Koji Furukawa, Iyo-gun (JP); Kentaro Sano, Iyo-gun (JP); and Junko Kawasaki, Ehime (JP)
Assigned to TORAY INDUSTRIES, INC., Tokyo (JP)
Appl. No. 17/773,694
Filed by TORAY INDUSTRIES, INC., Tokyo (JP)
PCT Filed Nov. 5, 2020, PCT No. PCT/JP2020/041337
§ 371(c)(1), (2) Date May 2, 2022,
PCT Pub. No. WO2021/095629, PCT Pub. Date May 20, 2021.
Claims priority of application No. 2019-206898 (JP), filed on Nov. 15, 2019.
Prior Publication US 2022/0411572 A1, Dec. 29, 2022
Int. Cl. C08G 59/50 (2006.01); C08J 5/24 (2006.01); C08L 63/00 (2006.01)
CPC C08G 59/5033 (2013.01) [C08J 5/243 (2021.05); C08L 63/00 (2013.01); C08J 2363/00 (2013.01); C08J 2463/00 (2013.01)] 4 Claims
 
1. A fiber reinforced composite material comprising a cured product of a laminate of a prepreg, the prepreg comprising a reinforcing fiber and an epoxy resin composition comprising the following components [A] to [C]:
[A]: epoxy resin;
[B]: aromatic diamine; and
[C]: one or more compounds having a boiling point of 130° C. or more, a molecular weight m of 70 or more and 110 or less, no epoxy group in the compound molecule and substantially no ability to cure epoxy resin,
wherein the following conditions (1) to (4) are satisfied:
(1): at least one of the component [C] compounds includes a polar component and a hydrogen bond component wherein a sum of the polar and hydrogen bond components in terms of the Hansen solubility parameter is 10.0 or more;
(2): at least one of the component [C] compounds has a Hansen solubility parameter distance L to the component [A] of 20.0 or less;
(3): a ratio C/E between an amount by mole, E, of epoxy groups of the component [A] and an amount by mole, C, of the component [C] compound or compounds satisfying both the condition (1) and the condition (2) is 0.01 or more and 0.13 or less; and
(4): the epoxy resin composition has a viscosity when held at 70°° C. for 2 hours that is 5.0 times or less an initial viscosity at 70° C.