Honeywell International Inc.
Synthesis of 2,3,3,3-tetrafluoropropene/vinylidene fluoride copolymers

Abstract:

Disclosed are aqueous emulsion copolymerization processes for synthesizing 2,3,3,3-tetrafluoropropene/vinylidene fluoride copolymers having 2,3,3,3-tetrafluoropropene as the major monomer unit. The copolymerization process is performed at temperatures of from about 55.degree. C. to about 70.degree. C. with at least one water soluble radical initiator, with preferred initiators including Na.sub.2S.sub.2O.sub.8, K.sub.2S.sub.2O.sub.8, (NH.sub.4).sub.2S.sub.2O.sub.8, Fe.sub.2(S.sub.2O.sub.8).sub.3, K.sub.2S.sub.2O.sub.8/FeSO.sub.4, (NH.sub.4).sub.2S.sub.2O.sub.8/Fe.sub.2O.sub.4, and the like, as well as combinations thereof.