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US 4,906,792 AGranted
O-hydroxyalkylation of 1,1-dihydroperfluorinated alcohols
AssigneeMinnesota Mining and Manufacturing Company
InventorsSteven M. Heilmann, Larry R. Krepski, Dean M. Moren, Jerald K. Rasmussen
Life of this patent
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Abstract
Mono O-hydroxyalkylated derivatives of 1,1-dihydroperfluorinated alcohols are prepared by reaction the alcohols with alkylene carbonates. The O-hydroxyalkylated derivatives are useful non-ionic surfactants and emulsifiable compounds for fire extinguishing systems.
Claims15
A process comprising the steps:
- a) reacting
- (1) a 1,1-dihydroperfluorinated alcohol having the formula ##STR6## wherein R.sup.1 is hydrogen or lower alkyl;
- a is 1 or 2 ;
- and
- R.sub.F is a substantially perfluorinated alkyl, cycloalkyl, or aryl group when a is 1, and perfluorinated alkylene when a is 2;
- with
- (2) an alkylene carbonate having the formula ##STR7## wherein R.sub.2 is an alkylene group having 2 to 4 carbon atoms;
- (3) in the presence of an effective amount of a catalyst, wherein said catalyst is a salt containing a basic anion or a nucleophilic anion, and a solubilizing cation;
- and
- b) isolating the resulting O-hydroxyalkylated derivative of said 1,1-dihydroperfluorinated alcohol having the formula ##STR8## wherein R.sup.1, R.sup.2, a, and R.sub.F are as defined above.
7 more elements
Dependencies are inferred from the claim text.