Process for coating plastic or metal surfaces

A surface of plastic or of metal coated by a method comprising treating in one step the plastic or metal surface in question with an aqueous dispersion comprising

• (A) at least one ethylene copolymer having a molecular weight Mn in the range from 2000 to 20 000 g/mol and a melt flow rate (MFR) in the range from 1 to 150 g/10 min, measured at 160° C. under a load of 325 g in accordance with EN ISO 1133, selected from ethylene copolymers comprising as comonomers in copolymerized form
• (a) 15.5% to 19.9% by weight of at least one ethylenically unsaturated C3-C10 carboxylic acid and
• (b) 80.1% to 84.5% by weight of ethylene,
• (B) at least one base,
• and thereafter providing in at least one further step the metal or plastic surface in question with at least one further coat.

An aqueous dispersion having a pH in the range from 7 to 10, comprising

• (A) at least one ethylene copolymer having a molecular weight Mn in the range from 2000 to 20 000 g/mol and a melt flow rate (MFR) in the range from 1 to 150 g/10 min, measured at 160° C. under a load of 325 g in accordance with EN ISO 1133, selected from ethylene copolymers comprising as comonomers in copolymerized form
• (a) 15.5% to 19.9% by weight of methacrylic acid and
• (b) 80.1% to 84.5% by weight of ethylene,
• and
• (B) at least one base selected from alkali metal hydroxide and ammonia.