Reactive hot-melt elastic sealant composition

A reactive hot-melt elastic sealant composition comprising:

• (A) a first component consisting essentially of a polyurethane prepolymer which is prepared by reacting a polyether polyol having a hydroxyl group at the terminus and having a weight average molecular weight of 6,000 to 40,000 and an excess amount of a polyisocyanate compound, and
• (B) a second component comprising a thermoplastic urethane multi-block copolymer resin, which is prepared by reacting (a) a polyfunctional ring-containing and active hydrogen-containing compound having a weight average molecular weight of 100 to 4,000 selected from the group consisting of a bisphenol resin, a terpene resin, a coumarone resin, a xylene resin, a rosin ester resin, a styrene resin, a phenol resin, a terpene phenol resin, and a rosin resin, (b) a diol or triol compound selected from the group consisting of ethylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, a polycarbonate diol, a polytetramethylene glycol, a polyacryldiol, a polyalkylene ether diol, a polyoxyalkylene-adduct bisphenol, trimethylolpropane, glycerin, triethylene triol, and a polyoxyalkylene ether triol, and (c) an excess amount of a polyisocyanate compound,
• wherein the reactive hot-melt elastic sealant composition contains 20 to 60% by weight of the polyurethane prepolymer, 5 to 30% by weight of the thermoplastic urethane multi-block copolymer resin, not more than 50% by weight of a filler, not more than 20% by weight of a plasticizer and not more than 10% by weight of other additives, and the first component is different from the second component.