| abstract |
A hot melt adhesive composition comprising a thermoplastic polyurethane copolymer, wherein the thermoplastic polyurethane copolymer comprises a reaction product of at least one polyester polyol and at least one polyisocyanate; wherein the polyisocyanate is NCO The molar ratio of the OH group of the base to the polyester polyol is less than 0.95:1; wherein the thermoplastic polyurethane copolymer has a viscosity of from 1,000 to 100,000 mPas at 160 ° C; wherein the thermoplastic polyurethane The copolymer has thermal stability, and wherein the thermal stability is defined as a viscosity change of less than ±10% compared to the initial viscosity of the thermoplastic polyurethane copolymer at 160 ° C after 6 hours. |