Polymerization of n-vinyl lactams

Claim 1

IN THE PROCESS OF PRODUCING POLYMERIZATION PRODUCTS OF N-VINYL LACTAMS WHEREIN AN N-VINYL LACTAM IS MIXED WITH A POLYMERIZATION CATALYST CAPABLE OF SUPPLYING OXYGEN UNDER THE REACTION CONDITIONS AND SELECTED FROM THE CLASS CONSISTING OF INORGANIC PEROXIDES AND ORGANIC PEROXIDES AND THE THUS OBTAINED MIXTURE IS HEATED TO EFFECT POLYMERIZATION; THE METHOD OF REDUCING THE RESIDUAL MONOMER CONTENT OF THE THUS OBTAINED POLYMERIZATION PRODUCT WHEN SAID POLYMERIZATION PRODUCT CONTAINS MORE THAN ONE PER CENT RESIDUAL UNSATURATION, AFTER THE DEGREE OF UNSATURATION OF THE REACTION MIXTURE BECOMES CONSTANT; WHICH COMPRISES ADDING TO THE SAID REACTION MIXTURE AFTER THE DEGREE OF UNSATURATION THEREOF REMAINS CONSTANT AN ADDITIONAL AMOUNT OF SAID CATALYST AND FURTHER HEATING SAID MIXTURE TO THEREBY POLYMERIZE THE N-VINYL LACTAM STILL IN SAID REACTION PRODUCT AND THUS REDUCE THE AMOUNT OF RESIDUAL MONOMER THEREIN.