C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/404, 402/533
C08F 214/26 (2006.01) C08F 259/08 (2006.01) C08L 27/18 (2006.01)
Patent
CA 1037195
ABSTRACT OF THE DISCLOSURE Thermoplastic elastomeric copolymers of tetrafluoroethylene and propylene and terpoly- mers of tetrafluoroethylene, propylene and a cure site monomer are disclosed which have a substantially uniform composition, i. e., a substantially uniform molar ratio of monomeric units and a relatively high molar ratio of tetra- fluoroethylene units to propylene units within the range 1.0:0.11 to 1.0-0.54. The combination of high molar ratio of tetrafluoroethylene/propy- lene units, substantially uniform composition and good elastomeric properties is achieved by using a hybrid batch/continuous process wherein a reactor is initially charged with a mixture of tetrafluoro- ethylene, propylene and, optionally, a cure site monomer having a TFE/propylene molar ratio substan- tially higher than that of the polymer to be pro- duced, i.e., in the range 1.0:0.01 to 1.0:0.087. The polymerization reaction is then initiated and a mixture of the same monomers is fed to the reac- tor at such a rate and in such proportions as to maintain the molar ratio of the unreacted monomers substantially the same as that in the initial charge to the reactor.
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