FIELD: chemistry.
SUBSTANCE: polyurethane and polyisocyanurate are prepared from a reaction mixture consisting of one or more polyisocyanates (A), one or more polyether polyols (B), one or more polyepoxides (C), one or more hidden catalysts (D), if necessary, additives (E) and, if necessary, fillers (F). The viscosity of the reaction mixture is from 20 to 500 mPas⋅ at 25 °C. The ratio of the number of NCO group of components (A) and the number of OH groups of components (B) is from 10:1 to 16:1. The ratio of the number of NCO groups of components (A) and the number of epoxy groups of components (C) is from 2:1 to 25:1 and the ratio of the number of epoxy groups of components (C) and the mole number of the latent catalyst of component (D) is from 1.1:1 to 12:1.
EFFECT: masses are optically transparent and have a good resistance to heat.
5 cl, 2 tbl, 2 ex
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