Method of epoxide or episulfide copolymer polymerization with nitro aromatic compound

Claim 1

IN A METHOD WHICH COMPRISES CONTACTING (A) A MIXTURE OF ORGANIC COMPOUNDS EACH COMPOUND CONTAINING AND POLYMERIZABLE THROUGH A SINGLE CYCLIC ETHER OR THIOETHER GROUP OF FROM 2 TO 3 CARBON ATOMS, AT LEAST 0.5 MOL PERCENT OF THE COMPOUNDS IN SAID MIXTURE CONTAINING ALIPHATIC UNSATURATION AND HAVING AN ATOM SELECTED FROM THE GROUP CONSISTING OF HALOGEN AND NON-CARBONYL OXYGEN ATOMS ATTACHED TO A CARBON ATOM ALPHA TO THE DOUBLE BOND, NONE OF THE COMPOUNDS IN COMPONENT (A) CONTAINING ALIPHATIC UNSATURATION WHEREIN THE ALPHA CARBON IS A PART OF A POLYUNSATURATED RING, NOSE OF THE COMPOUNDS IN COMPONENT (A) CONTAINING ALIPHATIC UNSATURATION WHEREIN THE ALPHA CARBON HAS ATTACHED THERETO A CARBONYL OXYGEN ATOM, (B) AN ORGANOMETALLIC EPOXIDE POLYMERIZATION CATALYST AND (C) A COCATALYST FOR (B), THE IMPROVEMENT WHICH COMPRISES INTRODUCING INTO THE POLYMERIZATION SYSTEM FROM ABOUT 0.01 TO ABOUT 5 MOLS PER MOL OF (B) OF (D) A NITROAROMATIC COMPOUND, WHEREBY GELATION OF (A) IS INHIBITED DURING AND AFTER POLYMERIZATION.