Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Reexamination Certificate
2000-05-01
2001-09-11
Cooney, Jr., John M. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C521S131000, C521S155000, C521S170000
Reexamination Certificate
active
06288135
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to azeotrope-like mixtures of 1,1,1,3,3-pentafluoropropane (“HFC-245fa”), water (“H
2
O”) and at least one hydrocarbon. The compositions of the invention are environmentally desirable for use as refrigerants, in centrifugal chillers, aerosol propellants, metered dose inhalers, fire extinguishers, blowing agents for polymer foam, heat transfer media, solvents, and gaseous dielectrics.
BACKGROUND OF THE INVENTION
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 of no ozone depletion potential such as hydrofluorocarbons, (“HFC's”).
Thus, the use of fluids that do not contain chlorofluorocarbons (“CFC's”) or hydrochlorofluorocarbons (“HCFC's” is desirable). Additionally, it is known that the use of single component fluids or azeotropic mixtures, which mixtures do not fractionate on boiling and evaporation, is desirable. However, the identification of new, environmentally safe, azeotropic mixtures is complicated due to the fact that it is difficult to predict azeotrope formation.
The art continually is seeking new fluorocarbon based mixtures that offer alternatives, and are considered environmentally safer substitutes for CFC's and HCFC's. Of particular interest are mixtures containing a fluorocarbon and a non-fluorocarbon, both low ozone depletion potentials. Such mixtures are the subject of this invention.
REFERENCES:
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patent: 2846458 (1958-08-01), Haluska
patent: 2917480 (1959-12-01), Bailey
patent: 5496866 (1996-03-01), Sommerfeld
patent: 5562857 (1996-10-01), Werner
patent: 5646196 (1997-07-01), Sommerfeld
patent: 5672294 (1997-09-01), Lund
patent: 5840212 (1998-11-01), Doerge
patent: 5889066 (1999-03-01), Doerge
Bement Leslie Bruce
Bogdan Mary Charlotte
Logsdon Peter Brian
Pham Hang Thanh
Riegal Ronald
Allied-Signal Inc.
Cooney Jr. John M.
Szuch Colleen D.
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