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US 5,560,861 AGranted
Azeotropic compositions
AssigneeMinnesota Mining and Manufacturing Company
InventorsRichard M. Flynn, Mark W. Grenfell, Frank W. Klink, Daniel R. Vitcak
Life of this patent
Estimating the term…
Abstract
Azeotropic compositions include a perfluorinated alkane or alkene and an organic solvent.
Claims8
An azeotropic composition consisting essentially of:
- (A) 95 weight percent perfluorohexane, and
- (B) 5 weight percent 2,2,4-trimethylpentane, and having a boiling point of about 57.degree. C. at ambient pressure.
An azeotropic composition consisting of:
- (A) about 90 to 99 weight percent of perfluorohexane,
- (B) about 10 to 1 weight percent of 2,2,4-trimethylpentane, and
- (C) a minor, effective amount of surfactant, such that the composition, when fractionally distilled, will yield a distillate fraction that is an azeotrope, the azeotrope consisting of about 95 weight percent perfluorohexane and about 5 weight percent 2,2,4-trimethylpentane and having a boiling point of about 57.degree. C. at ambient pressure.
The method of removing a contaminant from an article, comprising contacting said article with an azeotropic composition consisting of:
- (A) about 90 to 99 weight percent of perfluorohexane,
- (B) about 10 to 1 weight percent of 2,2,4-trimethylpentane, and
- (C) optionally, a minor, effective amount of surfactant, such that the composition, when fractionally distilled, will yield a distillate fraction that is an azeotrope, the azeotrope consisting of about 95 weight percent perfluorohexane and about 5 weight percent 2,2,4-trimethylpentane and having a boiling point of about 57.degree. C. at ambient pressure.
Dependencies are inferred from the claim text.