FIELD: chemistry.
SUBSTANCE: composition contains (A) urethane resin containing unsaturated groups, having number-average molecular weight of 1000-100000 and degree of unsaturation of 0.1-1 mol/kg, (B) tetrahydrofurfuryl(meth)acrylate and (C) a photopolymerisation initiator. The urethane resin (A) is obtained by reacting (a) polycarbonate diol, having number-average molecular weight of 500-3000, (b) bifunctional epoxy acrylate or bifunctional epoxy methacrylate. Said epoxy acrylate and epoxy methacrylate have two hydroxyl groups and two ethylenically unsaturated groups in each molecule, and (c) polyisocyanate.
EFFECT: composition of sealing agent demonstrates high curing effectiveness and yields a cured product, having low hardness, high flexibility, high breaking elongation, high physical and mechanical strength and a longer service life.
8 cl, 3 dwg, 2 tbl, 9 ex
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