COMPOSITION FOR PLASTICIZER-FREE THERMOPLASTIC POLYURETHANE ELASTOMER AND POLYURETHANE ELASTOMER HAVING LOW HARDNESS MANUFACTURED THEREFROM

摘要

A composition for a plasticizer-free thermoplastic polyurethane resin is provided to realize excellent reactivity and processability, and to obtain a polyurethane resin having a low Shore hardness of 80 or less. A composition for a plasticizer-free thermoplastic polyurethane resin comprises: 62-76 wt% of at least two polyols having different molecular weights; 20-30 wt% of a diisocyanate; and 4-8 wt% of a chain extender. The two polyols have a number average molecular weight of 1,000-4,000, and the mixed polyol containing at least two polyols having different molecular weights has a number average molecular weight of 1,100-3,900. The polyol includes an ethyleneoxide-capped polyol.