Compositions of difluoromethane, pentafluoroethane, 1,1,1,2-tetrafluoroethane and hydrocarbons
AssigneeE.I. du Pont de Nemours and Company
InventorsDonald Bernard Bivens, Barbara Haviland Minor, Akimichi Yokozeki
Life of this patent
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Abstract
The present invention relates to azeotrope-like compression refrigerant compositions consisting essentially of difluoromethane (HFC-32), pentafluoroethane (HFC-125), 1,1,1,2-tetrafluoroethane (HFC-134a) and 0.5-5 weight percent of a hydrocarbon selected from the group consisting of: n-butane; isobutane; n-butane and 2-methylbutane; n-butane and n-pentane; isobutane and 2-methylbutane; and isobutane and n-pentane.
Claims6
A nonflammable, azeotrope-like composition consisting essentially of from about 1 to about 19 weight percent difluoromethane (HFC-32), from about 25 to about 60 weight percent pentafluoroethane (HFC-125), from about 24 to about 60 weight percent 1,1,1,2-tetrafluoroethane (HFC-134a) and from about 0.5 to about 5 weight percent of a hydrocarbon selected from the group consisting of:
- n-butane;
- isobutane;
- n-butane and 2-methylbutane;
- n-butane and n-pentane;
- isobutane and 2-methylbutane;
- and isobutane and n-pentane.
Dependencies are inferred from the claim text.