Patent ID: 8765890

Claim:
A process for preparing an aqueous polyvinylidene fluoride dispersion comprising polymerizing from 50 to 100 mole percent of vinylidene fluoride monomer units and from 0 to 50 mole percent of one or more other fluoromonomers in an aqueous medium comprising from 100 ppm to 2 percent, based on the weight of the fluoropolymer solids formed, of one or more block emulsifier(s) having at least two different blocks, and having the formula: T 1 -[(CH 2 —CH 2 —O—) X ] m —[(CH 2 —C(CH 3 )—O—) Y ] n —[(CH 2 —CH 2 —CH 2 —O—) Z ] k -T 2 wherein, X, Y, and Z are between 2 to 200; and m, n, k are from 0 to 5, T 1 and T 2 are terminal groups selected from hydrogen, hydroxyl, carboxyl, ester, ether and/or hydrocarbon, and wherein no fluorosurfactant is used in the process.