C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/529, 402/535
C08F 214/18 (2006.01) C08F 8/20 (2006.01) C08F 216/12 (2006.01)
Patent
CA 2028428
TITLE PEROXIDE-CURABLE FLUOROELASTOMERS AND CHLOROFLUOROELASTOMERS HAVING BROMINE AND IODINE CURESITES AND THE PREPARATION ABSTRACT OF THE DISCLOSURE Peroxide-curable fluoroelastomers and chlorofluoroelastomers are prepared in the presence of iodinated compounds, with iodine bonding to a substantial number of terminal positions on the fluoroelastomer, and comprising up to 3 weight percent of bromine-containing units selected from fluoroolefins and perfluoroalkyl perfluorovinyl ethers, and complementally at least 97 weight percent of either units of vinylidene fluoride, one or more fluoroolefins, and optionally perfluoroalkyl perfluorovinyl ethers, or units of tetrafluoro- ethylene, perfluoroalkyl perfluorovinyl ether, and ethylene. The resulting fluoroelastomers have improved processability, excellent strength and compression set properties, and are useful in the preparation of injection molded shaft seals, gaskets and other molded parts. The fluoroelastomer is prepared by a continuous emulsion polymerization process. AD-5721
E. I. Du Pont de Nemours And Company
Sim & Mcburney
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