Fremgangsmåde til overtrækning af en genstand samt overtræksmateriale til anvendelse ved fremgangsmåden.

摘要

An article has a layer of a baked primer of a thermosetting resin on its surface, the primer having superimposed thereon a coating of a composition comprising a thermoplastic acrylic polymer of methyl or ethyl methacrylate and a thermosetting resinous interpolymer of an unsaturated carboxylic acid amide and at least one other monomer containing a group, said interpolymer having at least one hydrogen atom per amide unit, attached to amido nitrogen, replaced by the structure wherein R is hydrogen or alkyl having one to four carbon atoms and R1 is hydrogen, alkyl having one to twelve carbon atoms or alkoxyethyl. The thermoplastic polymer preferably comprises at least 70% of ethyl or methyl methacrylate, the balance being acrylonitrile, methacrylonitrile, styrene, an acrylate, another methacrylate, or acrylic, methacrylic, or itaconic acid; the preferred co-monomer is lauryl methacrylate. The thermosetting polymer may be an interpolymer of acrylamide with styrene, vinyl toluene, methylmethacrylate, acrylonitrile, methacrylonitrile, ethyl acrylate, 2-ethylhexyl acrylate, or dibutyl itaconate; some unsaturated acid may also be copolymerized. In this connection reference is made to Specification 826,652. Plasticizers may also be added (many examples are given). The compositions may also contain melamine-formaldehyde resins, alkyd resins, or both, titanium dioxide, metallic oxides, hydroxides, sulphates, sulphides, silicates or chromates, carbon black, organic pigments, metal powders, pearl-essence, talc, barytes, clay or diatomaceous earth, and are dissolved in organic solvents. The primer may be an alkyd resin, an amino-formaldehyde resin, an epoxy resin or mixtures thereof. The compositions may be applied by spraying to phosphatized steel panels, and baked.