Patent ID: 8440308

Claim:
A method of manufacturing shoes comprising a pre-step of heating a reactive hot-melt adhesive to melt it and providing the melted adhesive on a joining surface of at least one adherend, an ultraviolet treating step of irradiating the adhesive with ultraviolet light having irradiation energy more than 100 mJ/cm 2 and less than 1200 mJ/cm 2 to polymerize a polyurethane prepolymer, and a joining step of overlaying a joining surface of another adherend on the adhesive to bond both adherends together, wherein the reactive hot-melt adhesive contains the polyurethane prepolymer including a non-crystalline polyol and a crystalline polyol and having an (meth)acryloyl group and an isocyanate group at the end of a molecule, and a photopolymerization initiator, and the viscosity of the reactive hot-melt adhesive at 80° C. is 300 Pa·s or less, wherein the amount of the non-crystalline polyol contained in the polyurethane prepolymer is 20% by mass or more and 90% by mass or less with respect to the whole polyols, wherein the amount of the crystalline polyol contained in the polyurethane prepolymer is 10% by mass or more and 80% by mass or less with respect to the whole polyols, wherein a ratio (NCO/OH) of the isocyanate group (NCO) to a hydroxyl group (OH) in the polyurethane prepolymer is more than 1.5 and 3.0 or less, and wherein a ratio (acryloyl group/isocyanate group) between the total amounts of (meth)acryloyl groups and the total amounts of isocyanate groups, which are respectively present at the end of a molecule of the polyurethane prepolymer, is from 0.1 to 0.6.