abstract |
A method for inhibiting the polymerisation of vinyl-aromatic or vinyl-aliphatic cpds. (I) at elevated temp. in the absence of air comprises adding, as inhibitor, 4-hydroxy- or 4-acetylamino-2,2,6,6-tetramethyl-piperidin-N-oxyl (II or (III) or a mixt. thereof with p-nitrosophenol (IV) or 2-methyl-4-nitroso-phenol (V). |