Patent ID: 7144622

Claim:
Coating composition, wherein the coating comprises: thermoplastic fluorine-containing polymer; and a thermoplastic polycondensate, wherein the coating has a hardness gradient, wherein the coating hardness generally decreases from a first surface to a second surface, said coating being free from polyamides, polyimides or polyesters, wherein the coating comprises at least one thermoplastic polycondensate with a higher hardness than the thermoplastic fluorine-containing polymer, of which there is at least one, wherein the concentration of the thermoplastic polycondensate increases in the direction of the first surface, wherein, proximal to the first surface, the proportion of fluorine-containing polymer is 0 wt %, wherein the thermoplastic polycondensate is a material selected from the group consisting of polysulfone (PSU), polyphenylethersulfone (PPSU), polyaryletherketone (PAEK), polyetherketone (PEK), polyetheretherketone (PEEK), and mixtures thereof, and wherein the coating is essentially free of polymers other than the selected material from said group of thermoplastic polycondensate and the thermoplastic fluorine-containing polymer.