"benzyl group, an allyl group or an alkyl group with 1 to 5 carbon atoms, A is an epoxy compound residue, and X.sub.1.sup.- is Cl.sup.-, Br.sup.- or CH.sub.3SO.sub.4.sup.-.)Furthermore, It is desirable that the organo-sulfur compound be a compound which has a structural formula expressed by the above general formula (10) or (11).The following compounds may be cited, and are desirable for use, as or" . . . .