Imperial Chemical Industries Limited

Peter Butler

Andrew Doroszkowski

Auguste L Palluel

Michael A Toynton

Thomas N Bowen

A process for coating an article simultaneously with a metal and a film-forming polymer which comprises passing an electric current at a current density of 1 to 35 milliamps cm.sup.-2 between the article as a cathode and a counter-electrode immersed in an aqueous coating composition having an inherent pH of 2.5 to 9.5, comprising:

Coating process and composition

Coating compositions capable of curing at or near to room temperature comprise 90-50% by weight of a specified hydroxyl group-containing addition polymer, 10-50% by weight of an alkylated melamine-formaldehyde crosslinking agent and an acid catalyst consisting of a blend of a C.sub.1-4 alkylated arylsulphonic acid and a C.sub.8-14 alkylated arylsulphonic acid in amounts such that the --SO.sub.3 H group content is 0.70-2.1% of the total weight of the addition polymer and the crosslinking agent. The compositions are particularly suitable for the refinishing of automobile bodies.

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Maidenhead, United Kingdom

Peter Butler