| abstract |
This moisture-curable polyurethane hot-melt adhesive comprises 100 parts by weight of a urethane pre-polymer which is a product obtained from a reaction between an excessive amount of diphenylmethane diisocyanate and a mixture of a crystalline polyester polyol and a non-crystalline polyester polyol and/or a non-crystalline polyether polyol, and 5-20 parts by weight of a surface-modified silica gel containing an amino group. Preferable as the surface-modified silica gel is a silica gel to which a residual group of a silane oligomer, which is a hydrolytic product of aminoalkyl(di or tri)alkoxysilane, is linked. |