Polyamides comprising (per)fluoropolyether and poly(organo siloxane) units

A polyamide (PA) consisting of recurring units derived from monomers (A), (B) and (C) or derivatives thereof wherein:

• monomer (A) is selected from at least one of:
• (i) a mixture of:
• one or more aliphatic, cycloaliphatic or aromatic diamine(s) [amine (NN)] and
• one or more aliphatic, cycloaliphatic or aromatic dicarboxylic acid(s) [acid (AA)];
• and
• (ii) one or more aminoacid(s) [aminoacid (AN)] or lactam(s) [lactam (L)];
• monomer (B) is a functional (per)fluoropolyether selected from at least one of:
• a (per)fluoropolyether dicarboxylic acid (PFPE-AA) and
• a (per)fluoropolyether diamine (PFPE-NN);
• and
• monomer (C) is a functional polyorganosiloxane selected from at least one of:
• a diamino-polyorganosiloxane (PSIL-NN) and
• a dicarboxylic-polyorganosiloxane (PSIL-AA)
• characterized in that the overall amount of recurring units derived from monomers (B) and (C) or derivatives thereof ranges from 0.1 to 20% wt with respect to the overall weight of recurring units derived from monomers (A), (B) and (C).