Blended polyol ester lubricants for refrigerant heat transfer fluids
AssigneeCognis Corporation
InventorNicholas E. Schnur
Life of this patent
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Abstract
An ester blend, including an ester having neopentylglycol and a source of 2-ethylhexanoic acid as its reactive components and an ester having pentaerythritol and a source of 2-ethylhexanoic acid as its reactive components, is especially effective as a lubricant for chlorine-free fluorocarbon refrigerant heat transfer fluids, particularly Refrigerant 134a (1,1,1,2-tetrafluoroethane).
Claims20
A refrigerant working fluid consisting essentially of a substantially chlorine-free fluoro-group containing heat transfer fluid and the balance of a lubricant composition consisting essentially of an ester blend having a viscosity of about 10 centistokes at 40° C. and forming a single phase with said heat transfer fluid below about −40° C., said ester blend consisting essentially of (a) about 78% to about 79% by weight of an ester having neopentylglycol and a source of 2-ethylhexanoic acid as its reactive components and (b) about 21% to about 22% by weight of an ester having pentaerythritol and a source of 2-ethylhexanoic acid as its reactive components and wherein the acid value of the lubricant composition is not greater than about 0.02 mg KOH/g.
A refrigerant working fluid consisting essentially of a substantially chlorine-free fluoro-group containing heat transfer fluid and the balance of a lubricant composition consisting essentially of an ester blend having a viscosity of about 10 centistokes at 40° C. and forming a single phase with said heat transfer fluid below about −55° C., said ester blend consisting essentially of (a) about 78% to about 79% by weight of an ester having neopentylglycol and a source of 2-ethylhexanoic acid as its reactive components and (b) about 21% to about 22% by weight of an ester having pentaerythritol and a source of 2-ethylhexanoic acid as its reactive components and wherein the acid value of the lubricant composition is not greater than about 0.02 mg KOH/g.
A refrigerant working fluid consisting essentially of a substantially chlorine-free fluoro-group containing heat transfer fluid and the balance of a lubricant composition consisting essentially of an ester blend having a viscosity of about 10 centistokes at 40° C. and forming a single phase with said heat transfer fluid below about −70° C., said ester blend consisting essentially of (a) about 78% to about 79% by weight of an ester having neopentylglycol and a source of 2-ethylhexanoic acid as its reactive components and (b) about 21% to about 22% by weight of an ester having pentaerythritol and a source of 2-ethylhexanoic acid as its reactive components and wherein the acid value of the lubricant composition is not greater than about 0.02 mg KOH/g.
Dependencies are inferred from the claim text.