Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Liquid composition
Reexamination Certificate
2002-06-10
2004-10-19
Webb, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Liquid composition
C510S177000, C510S273000, C510S365000, C510S407000, C510S410000, C510S417000, C252S067000
Reexamination Certificate
active
06806247
ABSTRACT:
FIELD OF THE INVENTION
The present invention provides azeotrope-like compositions of tetrafluoroethane, pentafluoropropane, methylbutane, and water, and uses thereof.
BACKGROUND
Fluorocarbon based fluids have found widespread use in industry in a number of applications, including as refrigerants, aerosol propellants, blowing agents, heat transfer media, and gaseous dielectrics. Because of the suspected environmental problems associated with the use of some of these fluids, it is desirable to use fluids having low or even zero ozone depletion potential, such as hydrofluorocarbons (“HFC's”). Thus, the use of fluids that do not contain chlorofluorocarbons (“CFCs”) or hydrochlorofluorocarbons (“HCFCs”) is desirable. Additionally, the use of single component fluids or azeotropic mixtures, which do not fractionate on boiling and evaporation, is desirable. However, the identification of new, environmentally-safe, non-fractionating mixtures is complicated due to the fact that azeotrope formation is not readily predictable.
The industry is continually seeking new fluorocarbon based mixtures that offer alternatives, and are considered environmentally safer substitutes for CFCs and HCFCs. Of particular interest are mixtures containing both hydrofluorocarbons and non-fluorocarbons, both of low ozone depletion potentials. Such mixtures are the subject of this invention.
REFERENCES:
patent: 2834748 (1958-05-01), Bailey et al.
patent: 2846458 (1958-08-01), Halsuka
patent: 2917480 (1959-12-01), Bailey et al.
patent: 5635098 (1997-06-01), Lunger et al.
patent: 6043291 (2000-03-01), Takeyasu et al.
patent: 6100230 (2000-08-01), Bement et al.
patent: 6288135 (2001-09-01), Bement et al.
patent: 6635686 (2003-10-01), Bogdan et al.
patent: 6686326 (2004-02-01), Bogdan et al.
Saunders, J.H. and Frisch, K.C. Polyurethanes Chemistry and TechnologyInterscience Publishers, vol. XVI, Part I, 219-223 & Part II, 193-201.
Bogdan Mary C.
Cook Kane D.
Knopeck Gary M.
Pham Hang T.
Singh Rajiv R.
Honeywell International , Inc.
Szuch Colleen D.
Webb Gregory
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