Process for preparing telomers from ethylene and alpha, omega-di

Details Process for preparing telomers from ethylene and alpha, omega-di Process for preparing telomers from ethylene and alpha, omega-di

1993-02-26

1993-10-19

Evans, Joseph E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570139, C07C 1728, C07C 1908

Patent

active

052547736

ABSTRACT:
A process is disclosed wherein a telomer having the formula BrCH.sub.2 CH.sub.2 (CF.sub.2 CFX).sub.n CH.sub.2 CH.sub.2 Br is prepared by reacting a telogen of the formula Br(CF.sub.2 CFX).sub.n CH.sub.2 CH.sub.2 Br with ethylene in the presence of an organic free-radical generator, wherein X is fluorine or a trifluoromethyl radical and n is an integer having a value of 1-5. It has been found that, when at least 0.05 mole of said free-radical generator is used for each mole of said telogen, the conversion of the telogen to the telomer is surprisingly increased.

REFERENCES:
patent: 3055953 (1962-09-01), Smeltz
patent: 4058573 (1977-11-01), Knell
patent: 5068471 (1991-11-01), Paul et al.
Aplied Polymer Symposium No. 22, 103-125 (1973) "High-Temperature Fluorosilicone Elastomers".
J. Fluorine Chem. I (1971/72), 203-218; "The Synthesis of Bis-(Silyl)Polyfluoroalkane Derivatives".
Ber. Bunsen-Ges. Phys. Chem., ; vol. 94 (No. 8), pp. 874-882; (1990); "Krypton Monofluoride . . . ").

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