| abstract |
The present invention provides a moisture-curable hot-melt polyurethane composition, which is characterized by containing: a hot-melt polyurethane prepolymer (a) having isocyanate groups and a blowing agent composition (B) comprising N, N' -dinitrosopentamethylenetetramine (B1), urea (B2) and polyol (B3). The present invention also provides a method for producing a foamed and cured product of a moisture-curable hot-melt composition, which comprises heating and melting the hot-melt polyurethane prepolymer (a), mixing the hot-melt polyurethane prepolymer (a) with the blowing agent composition (B), applying the mixture to a substrate, and then subjecting the mixture to a heat treatment at a temperature not lower than the heating and melting temperature of the composition (a) to foam-cure the composition. The present invention addresses the problem of providing a solvent-free foaming system that can obtain a foamed cured product having a good texture and can maintain a good foamed state even in the form of a film. |