Thermoplastic compositions in powder form on the basis of polyamides, their preparation process and their use for coating of metallic substrats.

摘要

The invention relates to thermoplastic compositions in powder form based on polyamide and/or polyetheresteramide and containing resins obtained by polycondensation of aromatic sulphonamide compounds and of aldehydes or of dicarboxylic acids. The invention also relates to a number of processes for obtaining these powders and to their use for coating metal substrates without the need for any adhesion primer.