| abstract |
(57) [Summary] [Purpose] In hot melt adhesives, the temperature is 9 Provided is a polyurethane-based reactive hot-melt adhesive which can be melt-coated at a low temperature of 5 ° C. to 130 ° C. and has a large initial adhesive force and a long bondable time. [Structure] Polyester polyol having a melting point of 40 ° C. or higher and 65 ° C. or lower obtained by a condensation reaction of diol with adipic acid, suberic acid, sebacic acid and diesters thereof, and / or obtained by ring-opening polymerization of lactone ring A lactone polyester polyol having a melting point of 40 ° C. or higher and 65 ° C. or lower is used, and a diol having 10 or less carbon atoms and at least one side chain alkyl group is used as a chain extender, A reactive hot melt adhesive characterized by comprising an isocyanate group-containing prepolymer having an isocyanate group content of 1.5 to 5.5% by weight obtained by reacting the above with an organic isocyanate as a main component. |