Coated conductive substrates e.g. electrophoretically coated vehicle parts exposed to gravel impact, coated with a crosslinked composition containing pigment paste, epoxy or polyurethane resin and 6-12C alkyl-amide

摘要

A composition for coating conductive substrates based on (a) pigment paste, (b) polymeric material containing a cationic epoxy, polyurethane or acrylic resin and (d) a crosslinker, also contains (c) a (6-12C alkyl)-amide. An article consisting of a conductive substrate coated with a continuous, monolayer coating with a thickness of at least 50 microns, obtained by crosslinking a composition (I) containing (a) a pigment paste containing pigment(s) and optionally filler(s) dispersed in milling binder(s), (b) a polymeric material containing cationic resin(s) selected from epoxy resins, polyurethane and/or polyurea and/or poly(urethane-urea) resins and acrylic resins, (c) (6-12C alkyl)-amide(s) (preferably linear) and (d) crosslinking agent(s). Independent claims are also included for: (1) a pre-prepared mixture of (a) and (b) as above; (2) an electrophoresis bath containing the above mixture and water; and (3) a method for the production of articles as defined above by immersing a conductive substrate in a crosslinkable coating bath containing (a), (b), (c), water and optionally solvent, depositing a layer with a thickness of at least 50 microns by electrophoresis and then crosslinking the coating.