Patent ID: 7854860

Claim:
A microcapsulated epoxy resin hardener comprising at least a core (C) and a shell (S) covering the core, wherein: the core (C) is formed from, as a starting material, particles having an average particle diameter of over 0.3 μm but 12 μm or less, defined as a median diameter, which are made of an epoxy resin hardener (H) which has an amine adduct (A) and a low molecular amine compound (B) as major ingredients, a molecular weight distribution of the epoxy resin hardener (H), defined as a ratio of a weight average molecular weight to a number average molecular weight of the amine adduct (A), being over 1 but 7 or less, and a water content of the epoxy resin hardener (H) being 0.05-3 parts by mass based on 100 parts by mass of the epoxy resin hardener (H), and a content of said low molecular amine compound (B) in said epoxy resin hardener (H) is 0.001-3 parts by mass based on 100 parts by mass of said epoxy resin hardener (H); and the shell (S) has, at least on a surface, a binding group (x) absorbing infrared radiation of wave number 1630-1680 cm −1 , a binding group (y) absorbing infrared radiation of wave number 1680-1725 cm −1 , and a binding group (z) absorbing infrared radiation of wave number 1730-1755 cm −1 .