| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyisocyanate composition which has a less amounts of urethane bonds in a resin and a low viscosity and is free of low molecular weight compounds lowering in surface tack, and to provide a sealing agent which uses the composition and particularly has a low modulus and excellent weatherability. SOLUTION: The polyisocyanate composition comprises (1) an isocyanate- terminated prepolymer to be obtained from an aliphatic and/or alicyclic diisocyanate and (2) at least two kinds selected from a benzotriazole based ultraviolet absorber, a phosphite based antioxidant, an organic sulfur based antioxidant, a hindered phenol based antioxidant, and a hindered amine light stabilizer, and the sealing medium uses the composition.
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