| abstract |
(57) [Summary] [PROBLEMS] To provide a solventless moisture-curable hot-melt urethane resin composition capable of obtaining a high-performance porous layer having both excellent adhesiveness and durability (particularly hydrolysis resistance and heat resistance); There are provided a foam using the same, a sheet structure having a foam layer on a base material, and a sheet structure in which a foam layer and a leather-like film layer are integrated on the foam layer on the base material. SOLUTION: A solventless moisture-curable hot melt urethane resin composition comprising a urethane prepolymer (A) obtained by reacting a polyol component and a polyisocyanate component, an amine catalyst (B), and water (C). A polyfunctional polyol is used as an essential component for the polyol component of (A), The content of the polyfunctional polyol in the polyol component of (A) is 1 to 50% by weight, and the softening point of (A) is 30 to 16 The polyisocyanate component and the polyol component constituting (A) have a NCO group / OH group equivalent ratio in the range of 1.1 to 5.0. |