Peroxide-curable fluoroelastomers and chlorofluoroelastomers hav

Details Peroxide-curable fluoroelastomers and chlorofluoroelastomers hav Peroxide-curable fluoroelastomers and chlorofluoroelastomers hav

1990-04-02

1991-12-31

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526247, 526249, C08F 238

Patent

active

050773593

ABSTRACT:
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 tetrafluoroethylene, 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.

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patent: 4678847 (1987-07-01), Zhang et al.
patent: 4717744 (1988-01-01), Boutevin et al.
patent: 4745165 (1988-05-01), Arcella et al.
patent: 4774302 (1988-09-01), Haruyoshi et al.
patent: 4943622 (1990-07-01), Naraki et al.
patent: 4948853 (1990-08-01), Logothetis

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