Patent ID: 8246851

Claim:
A refrigerant composition wherein the refrigerant component consists essentially of: (a) pentafluoroethane in an amount from 60% to 70% by weight based on the weight of the refrigerant component; (b) a mixture of 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane in an amount from 26% to 36% by weight based on the weight of the refrigerant component; and (c) from 1% to 4% by weight based on the weight of the refrigerant component of a hydrocarbon-containing component selected from the group consisting of n-butane, isobutane, n-pentane, isopentane, ethyl methyl ether, dimethyl ether and mixtures thereof; wherein the hydrocarbon-containing component includes at least one oxygen-containing compound selected from the group consisting of ethyl methyl ether and dimethyl ether, and at least 80% by weight of the hydrocarbon-containing component is isobutane; said refrigerant composition optionally comprising (d) at least one lubricant; and optionally comprising (e) at least one additive selected from the group consisting of extreme pressure additives, antiwear additives, oxidation and thermal stability improvers, corrosion inhibitors, viscosity index improvers, pour point depressants, detergents, anti-foaming agents, and viscosity adjusters.