| http://www.w3.org/ns/prov#value | - U1##whereinM.sup.P+ is a cation selected from the group consisting of alkaline metals, alkaline earth metals, transitions metals and ammonium groups of formula NR.sup.+.sub.4 in which R is an alkyl radical,Y.sup.- is an anion such as the corresponding acid YH has a pKa fulfilling the condition 0.5.ltoreq.pKa.ltoreq.14 with the proviso that when the polymerizable compositions comprise an episulfide
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