Patent ID: 7648642
Filing Date: 2010-01-19
Classification: C09K

Abstract:
1. A nonflammable refrigerant composition consisting of: (a) pentafluoroethane in an amount from 83% to 90% based on the weight of the composition; (b) 1,1,1,2-tetrafluoroethane in an amount from 7.5% to 15% by weight based on the weight of the composition; and (c) a component that is in an amount of from 1% to 4% by weight based on the weight of the composition, which is at least 70% isobutane and the remaining selected from the group consisting of n-butane, isobutane, n-pentane, isopentane, dimethyl ether, ethylmethyl ether and mixtures thereof.