TECHNOLOGY FOCUS - POLYMERS - Preferred Method: A surfactant comprising a fluorosurfactant, preferably fluoroether surfactant is provided in the polymerization medium. Polymerizing produces less than 13 wt.% undispersed fluorinated ionomer based on the total weight of fluorinated ionomer produced. Providing the dispersed fluorinated ionomer particulate in the aqueous polymerization medium is performed by mixing concentrated aqueous liquid dispersion or dispersible powder of the fluorinated ionomer to the aqueous polymerization medium. Preferred Component: The amount of the dispersion particulate of fluorinated ionomer provided in the aqueous polymerization medium comprises less than 15 wt.% fluorinated ionomer solids produced in the aqueous dispersion. The particulate of fluorinated ionomer have a weight average particle size of 2-100 nm. The fluorinated ionomer of the particulate has an ion exchange ratio of 3-53. The fluorinated ionomer of the particulate is highly fluorinated, or perfluorinated. The process fluorinated ionomer of the particulate comprises a polymer backbone with recurring side chains attached to the polymer backbone with the side chains carrying ionic groups. The fluorinated ionomer of the particulate comprises ionic groups having a pKa less than 10. The fluorinated ionomer of the particulate comprises ionic groups including sulfonate, carboxylate, phosphonate, and/or phosphate. The fluorinated ionomer of the particulate comprises sulfonate groups. The recurring side chains are of formula -(O-CF2CFRf)a-(O-CF2)b-(CFR'f)cSO3X, or -O-CF2CF(CF3)-O-CF2CF2-SO3X. The fluorinated ionomer of the particulate in thermoplastic form has a melt flow at 270 degrees C using a 5 kg weight of about 1-500. The fluorosurfactant is of formula (R1-On-L-A-)Y1+. The aqueous medium contains less than 300 ppm perfluoroalkane carboxylic acid or salt fluorosurfactant having greater than or equal to 8C based on the weight of water in the aqueous polymerization medium.Rf, R'f=F, Cl, or 10C perfluorinated alkyl group;a=0-2;b=0-1;c=0-6;X= is H, Li, Na, K, or NH4;R1=linear or branched partially or fully fluorinated aliphatic group which may contain ether linkages;n=0 or 1;L= linear or branched alkylene group which may be nonfluorinated, partially fluorinated or fully fluorinated and which may contain ether linkages;A-=anionic group including carboxylate, sulfonate, sulfonamide anion, or phosphonate; andY1+=H, ammonium, or alkali metal cation.Provided that the chain length of R1-On-L- is not greater than 6 atoms. EXAMPLE - Demineralized water (1750 g), dispersion (1.4) of 20 wt.% aqueous solution of fluorinated ionomer particulate, and a 20 wt.% aqueous solution of dimer acid salt (DAS) (20) were charged to a steel reactor. Agitation was carried out at 110 rpm, and the reactor was heated to 25 degrees C, evacuated, and purged three times with tetrafluoroethylene (TFE). The reactor temperature was increased to 65 degrees C, and is pressured to 30 psig with TFE. About 40 mL freshly prepared aqueous initiator solution containing 0.5% ammonium persulfate (APS) was injected. After 5 g TFE have been consumed, 100 mL perfluoro(3,6-dioxa-4-methyl-7-octene)sulfonic acid was injected followed by 0.25 mL/minute perfluoro(3,6-dioxa-4-methyl-7-octene)sulfonic acid. At the same time, 0.25 mL/minute of 0.2 wt.% APS solution was injected for the remainder of the batch. The TFE feed rate was adjusted to 1.13 g/minute. After 60 minutes, the reaction was terminated. The dispersion was discharged from the reactor at less than 35 degrees C. The solids content of the raw dispersion was 7.1 wt.% and the raw dispersion particle size was 74 nm. The dispersion was coagulated by freezing and thawing. The polymer was isolated by filtering and drying in 150 degrees C convection air oven. The isolated polymer contained 48 wt.% perfluoro(3,6-dioxa-4-methyl-7-octene) sulfonic acid, and had a melt flow rate of 23.4 g/10 minutes.