Hydrogen-containing flourosurfacant and its use in polymerization
AssigneeE. I. Du Pont de Nemours and Company
InventorsAndrew E. Feiring, Ming-Hong Hung, Jose M. Rodriguez-Parada, Roger J. Zipfel
Life of this patent
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Abstract
A partially-fluorinated surfactant having internal methylene groups and having the formula R.sub.f --(CH.sub.2).sub.m --R'.sub.f --COOM wherein m is 1-3, R.sub.f is perfluoroalkyl or perfluoroalkoxy, containing 3-8 carbon atoms, R'.sub.f is linear or branched perfluoroalkylene containing 1-4 carbon atoms, and M is NH.sub.4, Li, Na, K, or H is useful in polymerization of fluorinated monomers. High molecular weight can be achieved in homopolymerization of tetrafluoroethylene.
Claims13
A compound having the formula R.sub.f --(CH.sub.2).sub.m --R'.sub.f --COOY, wherein m is 1-3, R.sub.f is perfluoroalkyl or perfluoroalkoxy containing 3-8 carbon atoms, R'.sub.f is linear or branched perfluoroalkylene containing 1-4 carbon atoms, Y is M or R, M is NH.sub.4, Li, Na, K or H, and R is linear, branched or cyclic alkyl containing 1-8 carbon atoms.
A compound having the formula R.sub.f (CH.sub.2).sub.x --CHI--(CH.sub.2).sub.y --R'.sub.f --COOR, wherein x and y are independently 0 or 1, R.sub.f is perfluoroalkyl or perfluoroalkoxy containing 3-8 carbon atoms, R'.sub.f is linear or branched perfluoroalkylene containing 1-4 carbon atoms, and R is linear, branched or cyclic alkyl containing 1-8 carbon atoms.
A compound having the formula R.sub.f --CH.sub.2 --R'.sub.f --A, wherein R.sub.f is perfluoroalkyl or perfluoroalkoxy containing 3-8 carbon atoms, R'.sub.f is linear or branched perfluoroalkylene containing 1-4 carbon atoms, and A is CF.sub.2 I or CH.sub.2 OH.
A process comprising polymerizing at least one fluorinated monomer in an aqueous medium containing initiator and dispersing agent to obtain an aqueous dispersion of particles of fluoropolymer, wherein said dispersing agent is a compound having the formula R.sub.f --(CH.sub.2).sub.m --R'.sub.f --COOM, wherein m is 1-3, R.sub.f is perfluoroalkyl or perfluoroalkoxy containing 3-8 carbon atoms, R'.sub.f is linear or branched perfluoroalkylene containing 1-4 carbon atoms, and M is NH.sub.4, Li, Na, K, or H.
Dependencies are inferred from the claim text.