A process for producing -form tris-(2,3-epoxypropyl)-isocyanurate crystals
containing from 2 to 15 wt % of -form tris-(2,3-epoxypropyl)-isocyanurate
in the interior of the crystals, which comprises the following steps (A), (B),
(C) and (D):
- (A) a step of reacting cyanuric acid with epichlorohydrin to form an
addition product of cyanuric acid and epichlorohydrin, followed by dehydrochlorination
to obtain a reaction solution containing tris-(2,3-epoxypropyl)-isocyanurate,
- (B) a step of removing epichlorohydrin from the reaction solution containing
tris-(2,3-epoxypropyl)-isocyanurate obtained in step (A), and dissolving the obtained
tris-(2,3-epoxypropyl)-isocyanurate in a solvent,
- (C) a step of gradually cooling the liquid obtained in step (B) at a
cooling rate within 20 C./hr for crystallization, followed by filtration
to obtain crystals, and
- (D) a step of washing and drying the crystals obtained in step (C).
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