| abstract |
Prodn. of electroconductive films on plastics surfaces (I) is carried out by diffusing monomers (II) and oxidant (III) into the region near (I), so that polymerisation takes place in this region. The polymers (IV) formed are intrinsically conductive and may be enhanced by other intrinsically conductive polymers and/or by metals. Pref. (II) are pyrrole, thiophene, furan, acetylene and aniline and (II) is Fe-III or Cu-II salts, I2, Br2 or anil. (II) and (III) are applied as liquids or solns. or in the gas state and pref. are absorbed by the plastics, causing it to swell. (II) and (III) may be applied separately, in either sequence, or simultaneously. The polymer film may be enhanced by repeated treatment with (II) and (III), by anodic polymerisation of (II) or other monomers or by chemo-electroplating with Cu, Ni or Au. USE/ADVANTAGE - The process is claimed for producing electroconductive films on polyolefins, polyamides, polyacrylates, polycarbonates, PVC, polystyrene, ABS, SAN and epoxide resins. It is useful for making housings acting as electro-magnetic screens, without greatly increasing their weight or impairing their impact strength. No additional corrosion protective is necessary. |