ORGANIC POLYISOCYANATE COMPOSITION, WATER-SEALING MATERIAL FORMING COMPOSITION, AND WATER SWELLING WATER-SEALING MATERIAL

摘要

Disclosed is an organic polyisocyanate composition (A) for a moisture-curable water-sealing material, wherein said composition contains an aromatic isocyanate-terminated prepolymer (a1) and an aliphatic organic polyisocyanate (a2), which is one or more compounds selected from a specific set, and in which the ratio and amount of isocyanate groups contained is within a prescribed range. The aforementioned prepolymer (a1) is the reaction product of aromatic polyisocyanates (a11) and polyether polyols (a12), wherein the aforementioned polyether polyols (a12) comprise polyether polyols (a12-1) with an amount of oxyethylene groups in a specific range and a nominal average functional base number of 2, and polyether polyols (a12-2) with an amount of oxyethylene groups in a specific range and a nominal average functional base number of 3.