Halogen-free flame-retardant polymer compositions

Abstract

The present invention relates to a halogen-free flame-retardant polymer composition, in particular a flame-retardant polymer composition containing zirconium phosphate, and further to a wire or cable comprising at least one layer of the above-mentioned flame-retardant polymer composition, and to the use of zirconium phosphate for improving the flame retardancy and / or water absorption of a polymer composition. The flame-retardant polymer composition comprises at least (A) 2.0 to 49.8 wt.-%, based on the total weight of the polymer composition, of an ethylene copolymer containing monomer units with polar groups; (C) 30 to 65 wt.-%, based on the total weight of the polymer composition, of a flame-retardant filler; (D) 2.0 to 10.0 wt.-%, based on the total weight of the polymer composition, of zirconium phosphate, and optionally (B) up to 6.0 wt.-%, based on the total weight of the polymer composition, of an ethylene homo- or copolymer containing units derived from maleic anhydride and / or a propylene homo- or copolymer, and / or further optionally (E) up to 17.0 wt.-%, based on the total weight of the polymer composition, of an ethylene and C4 to C12 alpha-olefin copolymer having a density in the range of 860 to 965 kg / m3, determined according to ISO 1183. 10 an ethylene homo- or copolymer containing units derived from maleic anhydride and / or a propylene homo- or copolymer, and / or further optionally (E) up to 17.0 wt.-%, based on the total weight of the polymer composition, of an ethylene and C4 to C 3 12 alpha-olefin copolymer having a density in the range of 860 to 965 kg / m3, determined according to ISO 1183. 3 12 alpha-olefin copolymer having a density in the range of 860 to 965 kg / m3, determined according to ISO 1183.

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