Back to results
US 6,183,661 B2Granted
Composition comprising a hydrofluoroalkane or hydrochlorofluoroalkane and a polyether lubricant
AssigneeImperial Chemical Industries PLC
InventorsPamela Louise Makin, Richard Llewellyn Powell
Life of this patent
Estimating the term…
Abstract
Refrigerant/lubricant compositions comprising a hydrofluoroalkane, e.g. R-134a, and a polyether which is the methyl encapped polooxypropylene ether of glycerol.
Claims7
In a composition for use in a compression type heat transfer device comprising:
- (a) a working fluid consisting essentially of at least one hydrofluoroalkane;
- and
- (b) a lubricant, the improvement wherein the lubricant consists essentially of a sufficient amount to provide lubrication of a polyether having a molecular weight between about 150 and about 3000, said polyether having the general formula
- wherein
- A represents the radical remaining after removing the active hydrogens from glycerol;
- R represents methyl or mixture of hydrogen and methyl;
- Q represents methyl;
- x is 1 or 3;
- and
- n is an integer having a value of at least 1.
7 more elements
A composition comprising:
- (a) a working fluid consisting essentially of at least one hydrofluoroalkane;
- and
- (b) a lubricant consisting essentially of a sufficient amount to provide lubrication of a polyether having a molecular weight between about 150 and about 3000 said polyether having the general formula
- wherein
- R represents a mixture of hydrogen and methyl;
- Q represents methyl;
- n is an integer having a value of at least 2;
- wherein the group A in the polyether is the radical remaining after removing the active hydrogens from butanol and x is 1.
5 more elements
A composition comprising:
- (a) a working fluid consisting essentially of at least one hydrofluoroalkane;
- and
- (b) a lubricant the improvement wherein the lubricant consists essentially of a sufficient amount to provide lubrication of a polyether having a molecular weight between about 150 and about 3000, said polyether having the general formula
- wherein
- A represents the radical remaining after removing the active hydrogens from glycerol or butanol;
- R represents a mixture of hydrogen and methyl;
- Q represents methyl;
- x is 1 or 3;
- and
- wherein n is an integer of at least 2 and the polyether is a copolymer comprising oxyethylene and oxypropylene units.
7 more elements
A composition comprising a working fluid consisting essentially of R-134a and a lubricating amount of a polyether of the formula
- wherein each p is an integer which may be the same or different, such that the viscosity of the polyether at 40° C. is at least 100 cSt.
Dependencies are inferred from the claim text.