| 摘要 |
1. Stable mixtures of N-methylpyrrolidone and chlorofluorinated hydrocarbons, characterised in that they contain a metal salt of an alkylarylsulphonic acid in a proportion of 0.05 to 2.5 % by weight relative to N-methylpyrrolidine, said metal salt corresponding to the formula : (Rm -Ar-SO3 )2 M in which R denotes a straight- or branched chain alkyl radical containing from 1 to 15 carbon atoms, m is an integer ranging from 1 to 3, Ar is an aromatic residue with one or more condensed aromatic nuclei, and M is an atom of zinc or of an alkaline-earth metal. |
