Reactive hot-melt adhesive having low content of monomeric diisocyanates

An adhesive composition comprising at least one isocyanate-functional polyurethane polymer PU,

• wherein the at least one isocyanate-functional polyurethane polymer PU comprises:
• at least one isocyanate-functional polyurethane polymer PU1 obtained by reacting at least one polyester polyol PO1 and at least one diisocyanate P1 at a molar ratio of isocyanate groups to hydroxyl groups of 1.5-2.1, and/or
• at least one isocyanate-functional polyurethane polymer PU2 obtained by reacting at least one polyester polyol PO2 and at least one diisocyanate P2 at a molar ratio of at least 3, and subjecting the thus obtained reaction mixture to a treatment to reduce the amount of residual monomeric diisocyanates, and
• wherein the adhesive composition further comprises at least one acetylated amorphous polyester polyol APO
• or wherein the at least one isocyanate-functional polyurethane polymer PU comprises:
• at least one isocyanate-functional polyurethane polymer PU3 obtained by reacting at least one polyester polyol PO3 and at least one polyurethane prepolymer PUP at a molar ratio of isocyanate groups to hydroxyl groups of 1.9-3.5, and
• wherein the at least one polyester polyol PO3 comprises at least one amorphous polyester polyol PO31 and wherein the adhesive composition optionally further comprises at least one acetylated amorphous polyester polyol APO.