Flame-retardant thermoplastic polyurethane based on metal hydroxides and polyesterols

摘要

The present invention relates to compositions comprising at least one thermoplastic polyurethane, at least one metal hydroxide, and at least one phosphorus-containing flame retardant, where the thermoplastic polyurethane is a thermoplastic polyurethane based on at least one diisocyanate and on at least one polyesterdiol, and has a weight-average molar mass in the range from 50 000 g/mol to 200 000 g/mol, measured by means of GPC. The present invention further relates to the use of compositions of this type for producing cable sheathing.

主权项

1. A composition, comprising:
a thermoplastic polyurethane, a metal hydroxide, a phosphorus-containing flame retardant, and at least one of an organically intercalated phyllosilicate and an organically intercalated hydrotalcite, wherein the thermoplastic polyurethane is a thermoplastic polyurethane based on at least one aromatic diisocyanate and on at least one polyesterdiol, the at least one polyesterdiol is one selected from the group consisting of a polyesterdiol made of ε-caprolactone and a condensate of adipic or sebacic acid with at least one alcohol selected from the group consisting of ethylene glycol, 1,3-propanediol, methyl-1,3-propanediol, 1,4-butanediol, 3-methyl-1,5-pentanediol, and 1,6-hexanediol, and a weight-average molar mass of the thermoplastic polyurethane is from 50 000 g/mol to 200 000 g/mol, measured by GPC, and the composition is free from inorganic oxides of magnesium, calcium, barium, strontium, boron, aluminum, and zinc.