Halogen-free flame retardant thermoplastic polyurethane elastomer composition and product and flame retardant package thereof

A halogen-free flame retardant thermoplastic polyurethane elastomer composition comprising a thermoplastic polyurethane and a halogen-free flame retardant composition comprising, based on the weight of the thermoplastic polyurethane:

• inorganic hypophosphite selected from lanthanum hypophosphite, yttrium hypophosphite, or a mixture thereof:
• 10-45 wt %;
• expandable graphite:
• 2-7 wt %;
• melamine or derivatives thereof:
• 7-13 wt %;
• and
• organic phosphorus-based flame retardant:
• 4-25 wt %;
• wherein the organic phosphorus-based flame retardant has the structural formula of
• wherein R is
• or meta-substituted benzene ring;
• n is an integer from 1 to 10;
• X1, X2, X3 and X4 are the same or different and are phenyl or a C6-C18 aryl group containing 1 to 3 C1-C2 alkyl substituent respectively;
• and
• wherein the thermoplastic polyurethane is polyether-based thermoplastic polyurethane.