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It is isocyanurate formed by trimerization of isocyanates and polyether formed by homopolymerization of epoxides. Once the trimerization of isocyanates occurs, there results materials with extremely higher functionalities which give highly crosslinked, brittle polymer. Therefore in the reactions between polyepoxide compounds and poly-isocyanate compounds, it is essential that the trimerization reaction be controlled by all means.
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