C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/403, 402/411
C08F 214/18 (2006.01) C08F 16/24 (2006.01) C08F 214/04 (2006.01) C08F 214/22 (2006.01) C08F 259/00 (2006.01) C08F 259/08 (2006.01) C08L 27/16 (2006.01)
Patent
CA 1037197
ABSTRACT OF THE DISCLOSURE Elastomeric fluorinated copolymers in powder form, suitable in extrusion, injection-molding and similar fabri- cating techniques for the formation of shaped articles are obtained by copolymerizing in aqueous emulsion in the first stage of a two-stage polymerization process vinylidene fluoride with pentafluoropropene, hexafluoropropene, chloro- trifluoroethylene, or a perfluorinated alkyl vinyl ether and optionally with tetrafluoroethylene to at least about 90% monomer conversion to a polymer having a melting point of less than about 60°C.; polymerizing in the same emulsion in the second stage at least one of the same monomers as in the first stage but in such proportions that the second stage polymer if made separately would have a melting point above 120°C.; flocculating the dispersion; and spray-drying at 121-177°C.
213937
Moore Albert L.
Tang Walter K.
E.i. Du Pont de Nemours And Company
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