Sealant composition comprising moisture curable isocyanurate containing compound
AssigneeSunstar Engineering Inc.
InventorsShingo Tsuno, Ryuichi Ueda, Masahiro Ito
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Abstract
At least some of the isocyanate groups in the cured polyurethane sealant of this invention have the isocyanurate structure. A moisture-curing sealant composition of the invention comprises an active isocyanato-terminated isocyanate prepolymer containing a polyol component with a molecular weight of 2,000 to 20,000 and an isocyanurating agent. The sealant composition of the present invention is particularly excellent in initial bond strength due to sharp viscosity buildup.
Claims8
A moisture-curing sealant composition which comprises (a) an active isocyanato-terminated urethane prepolymer containing a polyol component with a molecular weight of 2,000 to 20,000 and (b) an isocyanurate catalyst, the sealant composition being able to cure first on isocyanuration, at least in part, under the action of the catalyst, with the residual isocyanato group being then caused to take part in the curing reaction by moisture.
Dependencies are inferred from the claim text.