Refrigerant compositions
OwnerNeil Robertsinventor
Life of this patent
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Abstract
Refrigerant compositions are disclosed which comprise: (a) pentafluoroethane, octafluoropropane, trifluoromethoxydifluoromethane or nexafluoro-cyclopropane, or a mixture of two or more thereof, in an amount of at least about 35% based on the weight of the composition, (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, 1,1-difluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluoropropane or a mixture of two or more thereof, in an amount of at least bout 30% by weight based on the weight of the composition and (c) n-butane, in an amount from about 2.3 to about 4% by weight based on the weight of the composition.
Claims15
1-27. (canceled)
A refrigerant composition which consisting essentially of:
- a. pentafluoroethane in an amount from 5 to 60% based on the weight of the composition,
- b. at least on second component selected from the group consisting of 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,2,3,3-heptafluoropropane, or a mixture thereof, in an amount from 30 to 94% by weight based on the weight of the composition and
- c. an unsubstituted hydrocarbon of the formula CnHm in which n is at least 4 and m is at least 2n−2, other than methyl propane, in an amount from 1 to 10% based on the weight of the composition.
A composition according to claim 1 in which component (c) is n-butane.
Dependencies are inferred from the claim text.