| http://www.w3.org/ns/prov#value | - The powder of the present invention comprising at least two components with oppositely difunctional regulation preferably comprises polyamide or copolyamide whose median particle size d50 is from 10 to 250 ??m, preferably from 30 to 100 ??m, and very particularly preferably from 40 to 80 ??m.
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