Patent ID: 6903212
Filing Date: 2005-06-07
Classification: C07D

Abstract:
1. A process for producing β-form tris-(2,3-epoxypropyl)-isocyanurate crystals containing from 2 to 15 wt % of α-form tris-(2,3-epoxypropyl)-isocyanurate in the interior of the crystals, comprising: (A) reacting cyanuric acid with epichlorohydrin to form an addition product of cyanuric acid and epichlorohydrin, and dehydrochlorinating said product to obtain a reaction solution containing tris-(2,3-epoxypropyl)-isocyanurate, (B) removing epichlorohydrin from said reaction solution, and dissolving tris-(2,3-epoxypropyl)-isocyanurate in an organic solvent, wherein said solvent is acetonitrile, toluene, dioxane or dimethylformamide, to form a solution, (C) gradually cooling the solution of (B) at a cooling rate of at most 20° C./hr for crystallization, and filtering to obtain crystals, and (D) washing and drying said crystals, wherein said crystals have a remaining epichlorohydrin content of at most 100 ppm.