Patent ID: 6891017

Claim:
Polymerizable composition for making episulfide based resins comprising: A) at least one episulfide compound bearing at least one episulfide and at least one functional group capable of polymerizing with episulfide groups, and B) an effective amount of a polymerization catalyst system comprising: at least one salt of formula M m p+ Y n − wherein M p+ is a cation selected from the group consisting of alkaline metals, alkaline earth metals, transitions metals and ammonium groups of formula NR + 4 in which R is an alkyl radical, Y − is an anion such as the corresponding acid YH has a pKa fulfilling the condition 0.5≦pKa≦14 with the proviso that when M p+ is an ammonium group, the catalyst system further comprises an electro-donor compound, P is the valency of the cation, n=m×p, and at least one tertiary amine.