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Process and a composition for coating a metallic substrate with a polymeric film

Image Number 2 for United States Patent #4524092.

There is disclosed the coating of a metallic substrate with a cross-linked polymeric film by contacting the substrate with an aqueous composition containing:at least an acrylic or metacrylic compound which can be defined by the general formula: ##STR1## wherein: R is a straight-line or branched aliphatic hydrocarbon radical, either saturated or unsaturated containing from 2 to 10 carbon atoms, or a cycloaliphatic or an aromatic group;R.sub.1 and R.sub.2, equal to or different from one another, are straight-line or branched alkyl groups, either saturated or unsaturated and containing from 1 to 8 carbon atoms, or cycloaliphatic or aromatic groups;at least one unsaturated organic acid capable of being copolymerized with the compound (I), in an amount of from 5 to 40 parts by weight per 100 parts of the compound (I) or an organic or a mineral acid which cannot be copolymerized with the compound (I) in an amount of from 1 to 10 parts by weight per 100 parts of the compound (I), anda polymerization catalyst preferably selected from among the persulphates, the hydroperoxides, the peracids H.sub.2 O.sub.2 and the peroxides.A metallic substrate coated by the composition of polymeric nature as described above is then heated to a temperature equal to, or lower than C. approximately and for the time which is necessary to originate a polymeric film cross-linked upon said substrate.A film so deposited exhibits optimum properties as to adherence, resistance to bending and shocks and resistance to the saline mist.

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