Patent ID: 9212295
Filing Date: 2015-12-15
Classification: B29C,C08G,C08J,C09D

Abstract:
1. A production method for obtaining a fiber-reinforced composite material by impregnating a fiber assembly with an epoxy resin composition and curing, the method comprising preparing the epoxy resin composition including a constitutional element [A], a constitutional element [B], and a constitutional element [C] by blending at a temperature of at least 60° C. and no higher than 80° C., wherein, given that a blending amount of the constitutional element [B] is b parts by mass and a blending amount of the constitutional element [C] is c parts by mass with respect to 100 parts by mass of the constitutional element [A], wherein the epoxy resin composition satisfies equation (2) when the constitutional element [A] has a molecular weight in a range of equation (1), the epoxy resin composition satisfies equation (4) when the constitutional element [A] has a molecular weight in a range of equation (3), and the epoxy resin composition satisfies equation (6) when the constitutional element [A] has a molecular weight in a range of equation (5), wherein the constitutional element [A] is an epoxy resin of a converted molecular weight a; the constitutional element [B] is 3,3′-diaminodiphenyl sulfone; and the constitutional element [C] is 4,4′-diaminodiphenyl sulfone, the converted molecular weight a being defined as follows: in a case of using only one kind of epoxy resin as the epoxy resin [A], the converted molecular weight a is a product of an epoxy equivalent of the epoxy resin used and the number of epoxy groups in a molecule of the epoxy resin; and in a case of using a plurality of kinds of epoxy resin as the epoxy resin [A], the converted molecular weight a is a value obtained by: obtaining a product of an epoxy equivalent and the number of epoxy groups in a molecule of the epoxy resin for each epoxy resin component; and then weighted-averaging, per blending ratios of components composing the epoxy resin [A], the product of the epoxy equivalent and the number of epoxy groups thus obtained for each epoxy resin component.