Refrigerant compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorsNeil Andre Roberts, Owen Ross Chambers
Life of this patent
Estimating the term…
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° C. to +35° 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.
Claims12
A nonflammable refrigerant composition consisting of:
- (a) pentafluoroethane in an amount of 83-90% based on the weight of the composition;
- (b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane or a mixture thereof in an amount of 7.5-15% by weight based on the weight of the composition;
- and
- (c) isobutane in an amount of from 1-4% by weight based on the weight of the composition.
A nonflammable refrigerant composition consisting of:
- (a) pentafluoroethane in an amount of 80-90% based on the weight of the composition;
- (b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, or a mixture thereof in an amount of 7.5-15% by weight based on the weight of the composition;
- (c) isobutane in an amount of from 1-4% by weight based on the weight of the composition;
- and
- (d) an additional component comprising either a lubricant, an additive selected from the group consisting of extreme pressure, antiwear improvers, oxidation inhibitors, thermal stability improvers, corrosion inhibitors improvers, viscosity is index improvers, pour point depressants, detergents, anti-foaming agents, and viscosity adjusters;
- or mixtures of the lubricant and the additive.
A nonflammable refrigerant composition consisting of:
- (a) pentafluoroethane in an amount of 80-90% based on the weight of the composition;
- (b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, or a mixture thereof in an amount of 7.5-15% by weight based on the weight of the composition;
- (c) isobutane in an amount of from 1-4% by weight based on the weight of the composition;
- (d) an additional component comprising either a lubricant, an additive selected from the group consisting of extreme pressure, antiwear improvers, oxidation inhibitors, thermal stability improvers, corrosion inhibitors improvers, viscosity is index improvers, pour point depressants, detergents, anti-foaming agents, and viscosity adjusters;
- or mixtures of the lubricant and the additive;
- and
- (e) a hydrofluorocarbon in an amount not exceeding 5% by weight.
A nonflammable refrigerant composition consisting of:
- (a) pentafluoroethane in an amount of 80-90% based on the weight of the composition;
- (b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, or a mixture thereof in an amount of 7.5-15% by weight based on the weight of the composition;
- (c) isobutane in an amount of from 1-4% by weight based on the weight of the composition;
- (d) a hydrofluorocarbon selected from the group consisting of trifluoromethane, difluoromethane and mixtures thereof in an amount not exceeding 5% by weight.
Dependencies are inferred from the claim text.