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US 5,288,376 AGranted
Preparation of perfluorooligoether iodides
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsMasayuki Oyama, Noriyuki Koike, Toshio Takago
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Abstract
A perfluorooligoether iodide is prepared by exposing a perfluoropolyether carboxylic iodide to UV light.
Claims9
A method for preparing a perfluoropolyether iodide of the formula
- by reacting a perfluoropolyether carboxylic fluoride of the formula ##STR12## with a metal iodide of the formula MIa, wherein M is a metal atom and a is the valence of the metal, to form a perfluoropolyether carboxylic iodide of the formula (I) ##STR13## and exposing the perfluoropolyether carboxylic iodide of formula (I) to ultraviolet light at a wavelength of 220-280 nm at a temperature of 0.degree.-60.degree. C. for about 2 to about 30 hours.
A method for preparing a perfluoropolyether iodide of the general formula (II):
- ##STR14## wherein Rf is a perfluoroalkyl group having 1 to 10 carbon atoms, and
- n is an integer of from 0 to 100,
- said method comprising the steps of reacting a perfluoropolyether carboxylic fluoride of formula (III):
- ##STR15## with a metal iodide of the formula (IV)
- MIa (IV)
- to form a perfluoropolyether carboxylic iodide of formula (I):
- ##STR16## where M is a metal atom, a is the valence of the metal tom, and Rf and n are as defined above, and exposing the perfluoropolyether carboxylic iodide of formula (I) to ultraviolet light at a temperature of 0.degree.-60.degree. C. for about 2-30 hours to produce the perfluoropolyether of formula (II).
4 more elements
Dependencies are inferred from the claim text.