Delayed addition of emulsifying agent in aqueous polymerization of tetrafluoroethylene

Claim 1

IN A PROCESS FOR THE PRODUCTION OF AQUEOUS COLLOIDAL DISPERSIONS OF TETRAFLUOROETHYLENE HOMOPOLYMERS AND COPOLYMERS OF TETRAFLUOROETHYLENE WITH UP TO 25 PERCENT OF AT LEAST ONE MEMBER OF THEGROUP CONSISTING OF VINYL FLUORIDE, VINYLIDENE, FLUORIDE, MONOCHLOROTRIFLUOROETHYLENE, HEXAFLUOROPROPYLENE, HEXAFLUOROCYCLOBUTYLENE, ETHYLENE AND STYRENE IN THE PRESENCE OF A CATALYTIC AMOUNT OF A WATER-SOLUBLE POLYMERIZATION CATALYST, THE IMPROVEMENT WHICH COMPRISES INITIATING POLYMERIZATION OF A MEMBER OF THE GROUP CONSISTING OF TETRAFLUOROETHYLENE AND A MIXTURE OF TETRAFLUOROETHYLENE WITH UP TO 25 PERCENT OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF VINYL FLUORIDE, VINYLIDENE, FLUORIDE, MONOCHLOROTRIFLUOROETHYLENE, HEXAFLUOROPROPYLENE, HEXAFLUOROCYCLOBUTYLENE, ETHYLENE AND STYRENE, IN THE ABSENCE OF AN EMULSIFYING AGENT, AND, ONLY AFTER THE AMOUNT OF POLYMER FORMED EXCEEDS ABOUT 2 PERCENT OF THE AQUEOUS PHASE PLUS POLYMER BUT BEFORE THE AMOUNT OF POLYMER FORMED EXCEEDS ABOUT 10 PERCENT BY WEIGHT OF THE AQUEOUS PHASE PLUS POLYMER, ADDING BETWEEN ABOUT 0.01 AND 0.5 PERCENT BASED ON THE WEIGHT OF WATER OF AN ANIONIC DISPERSING AGENT TO THE COMPOSITION AND EFFECTING FURTHER POLYMERIZATION BY MAINTAINING THE RESULTANT MIXTURE AT THE POLYMERIZING TEMPERATURE TO WHICH IT HAS BEEN HEATED.