| 摘要 |
PURPOSE:To provide an adhesive compsn. having excellent thixotropy and gelation properties and giving a hardened material having excellent waterproofness, which comprises an alpha-cyanoacrylate and a silica gel treated with a silyl isocyanate added thereto. CONSTITUTION:This adhesive compsn. is obtd. by adding a silica gel treated with a silyl isocyanate to an alpha-cyanoacrylate to impart thixotropy and cause gelation. Pref. examples of the silyl isocyanates are compds. of the formula RnSi(NCO)4-n (wherein R is a 1-18C alkyl, aryl or alkenyl group and n is an integer of 1-3). The treatment of a silica gel with a silyl isocyanate is generally conducted in the presence of a low-boiling org. solvent (e.g., hydrocarbon, ester, ketone, etc.) having no active hydrogen.
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