ed or substituted divalent group from an aliphatic or cycloaliphatic hydrocarbon, Z5 and Z6, independently, represent oxygen, sulfur or the ???N(R???) groups, in which R??? is hydrogen or unsubstituted or substituted alkyl, aralkyl or aryl, and R3 is an unsubstituted or substituted alkyl, cycloalkyl or aralkyl group, wherein the coating contains one or more different stabilisers chosen from the gr