Arylsulfonium salt-solvent mixtures

Claim 1

A stable aryl onium salt-solvent mixture comprising (A) 1% to 75% by weight of aryl onium salt of the formula, [(R).sub.a (R.sup.1).sub.b (R.sup.2).sub.c X].sup.+ [MF.sub.6 ].sup.- and (B) 99% to 25% by weight of a cyclic carbonate selected from the class consisting of ethylene carbonate and propylene carbonate based on the total weight of (A) and (B), where R is a monovalent aromatic organic radical, R 1 is a monovalent organic aliphatic radical, selected from alkyl, cycloalkyl and derivatives thereof, R 2 is a polyvalent organic radical forming a heterocyclic or fused ring structure, selected from aliphatic radicals and aromatic radicals, X is a Group VIa element selected from sulfur and selenium, M is selected from P, As and Sb, a is a whole number equal to 0 to 3 inclusive, b is a whole number equal to 0 to 2 inclusive, c is a whole number equal to 0 or 1 and the sum of a+b+c is equal to 3 or the valence of X.