Imperial Chemical Industries Limited

Norman A Coombes

Charles W Bromley

Brian A Cooke

Michael R Wilkinson

Aqueous compositions suitable for forming on a substrate a temporary protective coating, which can subsequently be removed by treatment with an aqueous alkaline solution, comprise a sterically stabilized dispersion in an aqueous medium of particles of size range 0.1-10 .mu.m of a polymer derived from monomers including at least one acrylic monomer and from 5% to 40%, based on the total weight of monomers, of an ethylenically unsaturated monocarboxylic acid, or an equivalent proportion of an unsaturated polycarboxylic acid.

Coating compositions

A washcoat composition suitable for application to tin-plated mild steel consists of an aqueous carrier medium and a binder comprising specified relative proportions of (A) a thermosetting acrylic polymer in the form of a sterically stabilized dispersion in the aqueous medium and (B) an epoxy resin, the composition additionally containing an acid catalyst, in particular phosphoric acid or chromic acid or an ammonium or amine salt thereof.

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Maidenhead, United Kingdom

Norman A Coombes