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US 5,290,473 AGranted
Azeotrope-like compositons of 1,1,1,3,3,5,5,5-octafluoropentane, C1-C5 alkanol and optionally nitromethane
AssigneeAlliedSignal Inc.
InventorsRajat S. Basu, Ellen L. Swan
Life of this patent
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Abstract
Stable azeotrope-like compositions of 1,1,1,3,3,5,5,5-octafluoropentane, C.sub.1 -C.sub.5 alkanol and optionally nitromethane have been discovered which are useful as degreasing agents and as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing of printed circuit boards and dry cleaning.
Claims25
Azeotrope-like compositions consisting essentially of from about 90 to about 59 weight percent 1,1,1,3,3,5,5,5-octafluoropentane, from about 10 to about 40 weight percent ethanol and from about 0 to about 1 weight percent nitromethane which boil at about 64.degree. C. at 760 mm Hg;
- from about 92 to about 69 weight percent 1,1,1,3,3,5,5,5-octafluoropentane, from about 8 to about 30 weight percent isopropanol and from about 0 to about 1 weight percent nitromethane which boil at about 66.degree. C. at 760 mm Hg;
- from about 99 to about 84 weight percent 1,1,1,3,3,5,5,5-octafluoropentane, from about 1 to about 15 weight percent n-propanol and from about 0 to about 1 weight percent nitromethane which boil at about 69.degree. C. at 760 mm Hg;
- from about 99 to about 89 weight percent 1,1,1,3,3,5,5,5-octafluoropentane, from about 1 to about 10 weight percent n-butanol and from about 0 to about 1 weight percent nitromethane which boil at about 70.degree. C. at 760 mm Hg;
- from about 90 to about 71 weight percent 1,1,1,3,3,5,5,5-octafluoropentane, from about 10 to about 28 weight percent isobutanol and from about 0 to about 1 weight percent nitromethane which boil at about 70.degree. C. at 760 mm Hg;
- from about 91 to about 71 weight percent 1,1,1,3,3,5,5,5-octafluoropentane, from about 9 to about 28 weight percent t-butanol and from about 0 to about 1 weight percent nitromethane which boil at about 68.degree. C. at 760 mm Hg;
- and from about 99 to about 89 weight percent 1,1,1,3,3,5,5,5-octafluoropentane, from about 1 to about 10 weight percent t-amyl alcohol and from about 0 to about 1 weight percent nitromethane which boil at about 71.0.degree. C. at 760 mm Hg.
3 more elements
Dependencies are inferred from the claim text.