Refrigerant compositions
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United States of America Patent
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Sep 21, 2010
Issued Date -
N/A
app pub date -
Jul 12, 2007
filing date -
Oct 11, 2002
priority date (Note) -
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Abstract
Refrigerant composition are disclosed which comprises: (a) pentafluoroethane, trifluoromethoxydifluoromethane or hexafluorocyclopropane, or a mixture of two or more thereof, in an amount of at least 75% based on the weight of the composition, (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluoropropane or a mixture of two or more thereof, in an amount of from 10 to 20% by weight based on the weight of the composition and (c) an ethylenically unsaturated or saturated hydrocarbon, optionally containing one or more oxygen atoms, with a boiling point from -50.degree. C. to +35.degree. C., or a mixture thereof in an amount from 1% to 4% by weight based on the weight of the composition the weight ratio of component (a):component (b) being at least 4:1.
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