| abstract |
The present invention is polyamide blocks and polyether blocks, and is measured according to ISO 845, 700 kg / m 3 density from 20, preferably closed cell copolymers having 500 kg / m 3, more preferably 300 kg / m 3 from 40 to 20 It relates to a crosslinked foam. Preferably, the foam is either through a) extrusion / kneading by insertion of a blowing agent or expanding gas, followed by b) chemical or physical crosslinking, and c) decomposition of the organic blowing agent added in the first stage, or The supersaturated gas added in one stage is produced by a production method consisting of stages such as foaming through restoration of the equilibrium or through expansion of the gas added directly during extrusion (first stage). Preferably the foam does not undergo any further mechanical or heat treatment. |