Method for reducing an organic solvent remaining in...

Details Method for reducing an organic solvent remaining in... Method for reducing an organic solvent remaining in...

2005-06-07

2005-06-07

Balasubramanian, Venkataraman (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

Reexamination Certificate

active

06903212

ABSTRACT:
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, 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).

REFERENCES:
patent: 5892065 (1999-04-01), Tsukamoto et al.
patent: 6124454 (2000-09-01), Ikeda et al.
patent: 0 952 155 (1999-10-01), None

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