CPC C08G 73/0644 (2013.01) [C07D 405/14 (2013.01); C08G 59/3245 (2013.01); C08G 59/4215 (2013.01); C08G 59/688 (2013.01); C09D 179/04 (2013.01); C09J 179/04 (2013.01); Y10T 428/2982 (2015.01)] | 7 Claims |
1. A method comprising
producing an α-type tris-(2,3-epoxypropyl)-isocyanurate crystal comprising β-type tris-(2,3-epoxypropyl)-isocyanurate in the crystal in a ratio of 2% by mass to 15% by mass and the crystal having a particle diameter of 1 μm to 500 μm, the method comprising:
generating tris-(2,3-epoxypropyl)-isocyanurate as an epichlorohydrin adduct of cyanuric acid by reacting 1 mol of cyanuric acid with 5 mol to 180 mol of epichlorohydrin and subsequently carrying out dehydrochlorination;
forming a tris-(2,3-epoxypropyl)-isocyanurate solution from the generated tris-(2,3-epoxypropyl)-isocyanurate and a solvent that includes one or more of methyl ethyl ketone, acetone, acetonitrile, ethyl acetate, or epichlorohydrin;
separating undissolved β-type tris-(2,3-epoxypropyl)-isocyanurate from the tris-(2,3-epoxypropyl)-isocyanurate solution as a solid to obtain a crystal with an increased content ratio of α-type tris-(2,3-epoxypropyl)-isocyanurate; and
extracting β-type tris-(2,3-epoxypropyl)-isocyanurate contained in the crystal or the tris-(2,3-epoxypropyl)-isocyanurate solution with an additional solvent to obtain a crystal with a further increased content ratio of α-type tris-(2,3-epoxypropyl)-isocyanurate, wherein the additional solvent is one or more of methyl ethyl ketone, acetone, methanol, ethanol, water, or isopropanol.
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