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AssigneeArkema Inc.
InventorsBrett L. Van Horn, Christopher A. Bertelo, Scott C. Schmidt, Noah E. Macy, George J. Papakonstantopoulos
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The present invention relates to polymeric oil-return agents which solubilize or disperse mineral oil and/or synthetic oil lubricants with hydrofluorocarbon, hydrochlorofluorocarbon, and hydrofluoroolefin-based refrigerants and refrigerant compositions containing them. The polymeric oil-return agents are random copolymers containing less than about 30 wt % fluorine and produced from at least one monomer providing compatibility with the oil phase and at least one monomer providing compatibility with the refrigerant phase. The polymeric oil-return agents provide for more efficient return of mineral oil and/or synthetic oil lubricants from non-compressor zones back to a compressor zone in a refrigeration system.
A refrigerant composition, comprising:
A polymeric oil-return agent concentrate comprising greater than 50 wt % of polymeric oil-return agent comprising a random copolymer containing less than about 30 wt % fluorine and consisting of at least two different monomer types wherein at least on monomer is selected from the group consisting of acrylate monomers and methacrylate monomers and mineral oil and/or alkyl benzene oil.
A method of improving oil return in a heat transfer system containing a halogenated hydrocarbon containing at least one carbon atom and at least one fluorine atom;
Dependencies are inferred from the claim text.