Process for preparing long-chain polymethylene halide telomers
First Claim
1. A process comprising combining in a batchwise, semi-continuous, or continuous manner, or a combination thereof, in the presence of at least one free radical initiator, and at a temperature sufficient to cause said initiator to fragment to form free radicals, (a) at least one telogen selected from (1) fluoroalkyl halides that comprise at least one halomethylene moiety (—
- CHX—
) and, optionally, at least one non-fluorine heteroatom, and (2) perfluoroalkyl halides that comprise at least one halofluoromethylene moiety (—
CFX—
) and at least one non-halogen heteroatom, said halides being selected from iodides and bromides; and
(b) ethylene;
said telogen and said ethylene being combined in total amounts such that the number of moles of ethylene per mole of telogen is at least 4.
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Abstract
A process comprises combining in a batchwise, semi-continuous, or continuous manner, or a combination thereof, in the presence of at least one free radical initiator, and at a temperature sufficient to cause the initiator to fragment to form free radicals, (a) at least one telogen selected from (1) fluoroalkyl halides that comprise at least one halomethylene moiety (—CHX—) and, optionally, at least one non-fluorine heteroatom, and (2) perfluoroalkyl halides that comprise at least one halofluoromethylene moiety (—CFX—) and at least one non-halogen heteroatom, the halides being selected from iodides and bromides; and (b) ethylene; the telogen and the ethylene being combined in total amounts such that the number of moles of ethylene per mole of telogen is at least about 4.
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Citations
20 Claims
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1. A process comprising combining in a batchwise, semi-continuous, or continuous manner, or a combination thereof, in the presence of at least one free radical initiator, and at a temperature sufficient to cause said initiator to fragment to form free radicals, (a) at least one telogen selected from (1) fluoroalkyl halides that comprise at least one halomethylene moiety (—
- CHX—
) and, optionally, at least one non-fluorine heteroatom, and (2) perfluoroalkyl halides that comprise at least one halofluoromethylene moiety (—
CFX—
) and at least one non-halogen heteroatom, said halides being selected from iodides and bromides; and
(b) ethylene;
said telogen and said ethylene being combined in total amounts such that the number of moles of ethylene per mole of telogen is at least 4. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- CHX—
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20. A process comprising combining in a batchwise, semi-continuous, or continuous manner, or a combination thereof, in the presence of at least one free radical initiator selected from azo compounds, peroxides, peresters, and mixtures thereof, under substantially oxygen-free conditions, and at a temperature from 75°
- C. to 125°
C., (a) at least one telogen selected from (1) the class of fluoroalkyl halides that is represented by the following general formula;
R′
CH(R)X
(1)wherein R′
is a fluoroalkyl or perfluoroalkyl group of 1 to 25 carbon atoms that optionally comprises at least one non-fluorine heteroatom;
R is hydrogen or a perfluoroalkyl group of 1 to 6 carbon atoms; and
X is iodine or bromine; and
(2) the class of perfluoroalkyl halides that is represented by the following general formula;
R′
″
CF(R″
)X
(II)wherein R′
″
is a perfluoroalkyl group of 1 to 25 carbon atoms that comprises at least one non-halogen heteroatom;
R″
is fluorine or a perfluoroalkyl group of 1 to 6 carbon atoms; and
X is iodine or bromine; and
(b) ethylene;
said telogen and said ethylene being combined in total amounts such that the number of moles of ethylene per mole of telogen is at least 8.
- C. to 125°
Specification