Epoxy resin hardner epoxy resin composition and epoxy resin hardener process

摘要

An epoxy resin hardener having in the molecule on average two or more functional groups which may react with epoxy groups, in which on average one or more functional groups are aromatic ester groups derived from aromatic carboxylic acids and hydroxy-aromatic compounds, the ester groups directly connecting the aromatic rings of the acid and the hydroxy compound to each other; an epoxy resin composition which comprises containing therein the epoxy resin hardener defined above. A process for hardening an epoxy resin which comprises using the epoxy resin hardener defined above. A typical example of the aromatic ester is one which is obtained by esterifying more than 50 % of phenolic hydroxyl groups of a polyhydric phenol with benzoic acid or naphthoic acid optionally having substituted groups and/or atoms.