EPOXY RESIN COMPOSITION, PREPREG, AND FIBER-REINFORCED COMPOSITE MATERIAL

• Main Authors: SANO, Kentaro, TAKAIWA, Reo, KURODA, Taiki, HIRANO, Noriyuki
• Format: Patent
• Language: English; French; German
• Published: 01.12.2021
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The present invention provides an epoxy resin composition that serves to produce a cured epoxy resin that simultaneously realizes a high heat resistance, a high elastic modulus, and a low color and to produce a molded article having a good appearance without suffering the formation of white spots on the surface thereof when used as matrix resin in a fiber reinforced composite material. An epoxy resin composition including an epoxy resin as component [A], an aromatic urea [B1] and/or an imidazole compound [B2] as component [B], and a borate ester compound as component [C], containing dicyandiamide in the amount of 0.5 part by mass or less relative to the total quantity of epoxy resins which accounts for 100 parts by mass, and meeting the requirement or given below: meeting the condition (a), condition (b), and condition (c) given below, meeting the condition (d) and condition (e) given below, (a) an isocyanurate type epoxy resin [A1] is contained as component [A] in an amount of 10 to 40 parts by mass relative to the total quantity of epoxy resins which represents 100 parts by mass, (b) an bisphenol type epoxy resin [A2] is contained as component [A] in an amount of 40 to 90 parts by mass relative to the total quantity of epoxy resins which represents 100 parts by mass, (c) resin [A2] has an average epoxy equivalent weight of 220 to 500 g/eq, and (d) an epoxy resin [A3] as represented by specific general formula is contained as component [A] in an amount of 50 to 100 parts by mass relative to the total quantity of epoxy resins which represents 100 parts by mass, and (e) the average epoxy equivalent weight over all epoxy resins is 165 to 265 g/eq.