Patent ID: 7709582
Filing Date: 2010-05-04
Classification: C08G,C08J,Y10T

Abstract:
1. An epoxy resin composition for fiber reinforced composite material comprising the following components (1)-(4), and meeting the following conditions (I)-(IV) for mixing ratios: Component (1): an epoxy resin, comprising N,N-diglycidyl aniline or N,N-diglycidyl-o-toluidine, that is liquid at room temperature, Component (2): an aromatic polyamine that is liquid at room temperature, Component (3): diaminodiphenylsulfone, comprising 3,3′-diaminodiphenylsulfone and 4,4′-diaminodiphenylsulfone, and Component (4): 4-tert-butylcatechol as a curing accelerator, Condition (I): the proportion of component (1) relative to the entire epoxy resin in the composition is 60-100 wt %, Condition (II): the total proportion of component (2) and component (3) combined relative to the entire polyamine in the composition is 70-100 wt %, Condition (III): the proportion of component (3) relative to the entire polyamine in the composition is 25-60 wt %, and Condition (IV): the stoichiometric ratio of the entire polyamine to the entire epoxy resin in the composition is 0.7-1.3:1, wherein amounts of Components (1)-(4) are determined so that a theoretical molecular weight between crosslinking points, α, of the cured resin is 250-350 g/mol.