US 12,435,178 B2
Resin composition for fiber-reinforced plastic, and fiberreinforced plastic containing said composition
Kazuhide Morino, Kuki (JP); and Naohiro Fujita, Kuki (JP)
Assigned to ADEKA CORPORATION, Tokyo (JP)
Appl. No. 17/429,501
Filed by ADEKA CORPORATION, Tokyo (JP)
PCT Filed Mar. 4, 2020, PCT No. PCT/JP2020/009066
§ 371(c)(1), (2) Date Aug. 9, 2021,
PCT Pub. No. WO2020/184324, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 2019-042809 (JP), filed on Mar. 8, 2019.
Prior Publication US 2022/0144999 A1, May 12, 2022
Int. Cl. C08G 59/22 (2006.01); C08G 59/24 (2006.01); C08G 59/42 (2006.01); C08G 59/68 (2006.01); C08J 5/24 (2006.01); C08K 5/5435 (2006.01)
CPC C08G 59/226 (2013.01) [C08G 59/245 (2013.01); C08G 59/4238 (2013.01); C08G 59/683 (2013.01); C08G 59/688 (2013.01); C08J 5/243 (2021.05); C08J 5/249 (2021.05); C08K 5/5435 (2013.01); C08J 2363/02 (2013.01)] 9 Claims
 
1. A composition comprising 100 parts by mass of reinforcing fibers and 5 to 150 parts by mass of a resin composition for fiber-reinforced plastic comprising (A) an epoxy resin, (B) an acid anhydride, and (C) a catalyst that is liquid at 25° C.,
the catalyst (C) comprising at least one member selected from the group consisting of (c1) a compound composed of an acid derived from an aromatic compound comprising phenol or nonylphenol and an organic base derived from a cyclic amidine comprising 1,8-diazabicyclo[5.4.0]undec-7-ene or 1,5-diazabicyclo[4.3.0]non-5-ene and (c2) a compound composed of a tetraalkylphosphonium cation and an anion selected from the group consisting of alkylphosphorodithioate, alkyl phosphate, and ethyl sulfate,
wherein the resin composition contains 5.1 to 20 parts by mass of the catalyst (C) per 100 parts by mass of the epoxy resin (A),
wherein the resin composition for fiber-reinforced plastic has a rate of viscosity increase of 200% or less, measured as follows:
a 2000 g portion of the resin composition is put in a container, and its temperature is adjusted to 25° C.; a first viscosity V1 of the resin composition at 25° C. is measured; then an acceleration test is performed on the resin composition, and a second viscosity V2 of the resin composition at 25° C. is measured after the acceleration test to calculate the rate of viscosity increase according to the equation:
rate of viscosity increase (%)=(V2/V1)×100:
wherein the acceleration test is carried out by leaving the container containing the resin composition in a water bath kept at 25° C. for 4 hours,
wherein the acid anhydride (B) comprises an unsaturated alicyclic polycarboxylic acid anhydride which is liquid at 25° C., and the content of the acid anhydride (B) in the resin composition is such that the number of the acid anhydride groups in the acid anhydride is 0.9 to 1.2 per epoxy group in the epoxy resin, and
wherein the epoxy resin (A) comprises a dicyclopentadiene epoxy resin represented by formula (1):

OG Complex Work Unit Chemistry
where R1 and R2 each independently represent a hydrogen atom or a methyl group.