POLYETHER BLOCK AMIDE FOAM

摘要

The present invention concerns a crosslinked foam of a copolymer having polyamide blocks and polyether blocks and a density from 20 to 700 kg/m3. Density is measured according to Method ISO 845. Advantageously the density is from 70 kg/m3 to 400 kg/m3. Advantageously the cell size is from 0.05 to 2.0 mm, preferably from 0.1 mm to 1.0 mm. Advantageously the cells are closed. Preferably the foam does not undergo any further mechanical or thermal treatment. This foam has many advantages and specific features: The compressive strength is from 90 to 170 kPa, preferably from 110 to 150 kPa (measured on foam of 240 kg/m3, at 25% deflection, method according to ISO 844). The shore hardness O is from 20 to 34, preferably from 23 to 32 (measured on foam of 240 kg/m3, internal method). The thermal conductivity is from 0.038 to 0.058 W/m°K, preferably from 0.043 to 0.053 W/m°K (measured on foam of 240 kg/m3, method according to ISO 2581) The energy return is 28 to 40 cm, preferably 31 to 37 cm (measured on foam of 240 kg/m3, method according to ISO 8307). The water vapour transmission is 500 to 10000 g/m2/day, preferably 1000 to 3500 g/m2/day (measured on foam of 240 kg/m3, 2.5 mm thickness, method according to ASTM E96 BW) provided there are enough hydrophilic polyether blocks.