1. Zinc ammoniate ethylenebis(dithiocarbamate) — poly[ethylenebis(thiuramdisulfide)]

2. 2¿ and b) a dithiocarbamate (II) selected from the group: manganese-ethylene bis(dithiocarbamate) (zinc complex) (IIa); manganese-ethylene bis(dithiocarbamate) (IIb); zinc ammoniate-ethylene bis(dithiocarbamate) (IIc) and zinc-ethylene bis(dithiocarbamate) (IId), and/or c) a carbamate of formula (III) (CH¿3?)