Patent ID: 8039522
Filing Date: 2011-10-18
Classification: C08G

Abstract:
1. A method for producing a latent curing agent in which an aluminum chelating agent is held in a porous resin obtained by the interfacial polymerization of a polyfunctional isocyanate compound, wherein, when said latent curing agent is incorporated in a curable epoxy resin composition for differential scanning calorimetric (DSC) measurement, the DSC exothermic peak temperature of the curable epoxy resin composition for DSC measurement that contains the latent curing agent that has been treated by immersion in a nonaqueous polar solvent can be brought to not less than the DSC exothermic peak temperature of the curable epoxy resin composition for DSC measurement that contains the latent curing agent that has not been subjected to the immersion treatment, the method comprising: introducing an aqueous solution containing an emulsifying agent into a solution prepared by dissolving an aluminum chelating agent and a polyfunctional isocyanate compound in a volatile organic solvent that is a lower alkyl ester of acetic acid; emulsifying the resulting solution by ultrasonic homogenization; emulsifying and dispersing the resulting emulsion in an aqueous phase that contains a dispersing agent; and thereafter carrying out interfacial polymerization by heating and stirring.