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AssigneeCognis Performance Chemicals UK Limited
InventorsSimon Lawford, John Robert Moxey, Andrew Small
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A composition is disclosed which comprises a lubricating oil and a refrigerant, wherein the lubricating oil comprises a polyalkyleneglycol derivative of the formula (I): RX(RaO)x(RbO)y(RcO)zRd, wherein: X=O or S, R is a C3 to C15 substituent comprising a heterocyclic ring, in which the heteroatom(s) in said ring is (are) oxygen and/or sulphur, Ra is a C2 alkylene group, Rb is a C3 alkylene group, Rc is a C4 alkylene group, Rd is the same as R, or is H, a C1-C20 alkyl or a C1-C20 acyl, x, y, z are each independently 0 or an integer of 100 or less, and x+y+z=4 to 100, but excluding compositions where the refrigerant is halogen-free and R contains a carbonate group. The use of borate esters as dehydrogenating agents in conjunction with the above lubricating oils is also disclosed.
Composition comprising a lubricating oil and a refrigerant, wherein the lubricating oil comprises a polyalkyleneglycol derivative of the formula (I):
Composition according to any preceding claim wherein each of Ra, Rb and Rc is represented by the formula [—C(Re)(Rf)—C(Rg)(Rh)—]
Composition according to any preceding claim wherein one or two of x, y and z is zero.
Composition according to any preceding claim wherein
Composition according to any preceding claim wherein x+y+z=5 to 50, preferably 15 to 40, and more preferably, 15 to 25.
Composition comprising a refrigerant, a lubricating oil, and a borate ester of the formula (III)
Composition according to any preceding claim wherein the refrigerant comprises 1,1,1,2-tetrafluoroethane (R134a), difluoromethane (R32), pentafluoroethane (R125) or 1,1,1-trifluoroethane (R143a) or blends thereof.
Use of a borate ester of the formula (III) as a dehydrating agent for a lubricating oil used in conjunction with a refrigerant.
Dependencies are inferred from the claim text.