Patent ID: 8128837
Filing Date: 2012-03-06
Classification: C08G,H05K

Abstract:
1. A method for manufacturing a latent curing agent for an epoxy resin, the latent curing agent for an epoxy resin comprising: particles of an adduct formed through adduct reaction of an epoxy-based compound with a particulate imidazole-based compound; and a film of ethyl cellulose crosslinked with a polyfunctional isocyanate, the film covering surfaces of the adduct particles, wherein the ethyl cellulose crosslinked with the polyfunctional isocyanate is derived from an ethyl cellulose in which a degree of substitution of three hydroxyl groups in a cellulose skeleton is 2.25 to 2.60; the method comprising: allowing the epoxy-based compound to undergo the adduct reaction with the particulate imidazole-based compound to give a slurry of adduct particles; cooling the slurry of adduct particles to 80 to 100° C.; following the cooling, adding a polyfunctional isocyanate compound and allowing the polyfunctional isocyanate to crosslink the ethyl cellulose; and separating a particulate latent epoxy resin curing agent from the slurry.