Patent ID: 8809471

Claim:
A process for forming a copolymer of 2,3,3,3-tetrafluoropropene, comprising the step of forming an emulsion polymer by contacting in a reaction zone a mixture comprising: 1) from 1 to 90 wt percent of 2,3,3,3-tetrafluoropropene, based on the total weight of monomers; 2) from 10 to 99 wt percent of one or more other fluoromonomers based on the total weight of monomers; 3) from 0 to 50 wt percent of other ethylenically unsaturated monomers based on the total weight of monomers; 4) a persulfate initiator as the primary initiator; 5) 100 ppm to 2 wt percent, based on the weight of the copolymer solids, of one or more non-fluorinated surfactants, wherein no fluorosurfactants are used in the emulsion polymerization; wherein said contacting is carried out at a temperature of from 50° C. to 135° C., and at a pressure of from 1380 to 8275 kpa; and wherein said copolymer formed has a high molecular weight, having a melt viscosity of greater than 5 Kpoise.