Refrigerating machine oil compositions

A refrigerating machine oil composition, comprising:

• a full ester of a diol or a polyol having 3-20 hydroxyl groups with a fatty acid having 6-20 carbon atoms as a base oil;
• at least one oxygen-containing compound selected from the group consisting of the following (A3), and (A5):
• (A3) Trihydric alcohol having 3-20 carbon atoms not including alkylene oxide adduct of a polyhydric alcohol having 3-6 hydroxyl groups, and
• (A5) Hydrocarbyl ether of dihydric alcohol having 2-20 carbon atoms not including polyalkylene glycol;
• at least one refrigerant selected from the group consisting of HFC refrigerants, perfluoroether, dimethyl ether, hydrocarbon, and mixtures thereof;
• and
• an epoxy compound;
• wherein the refrigerating machine oil composition does not comprise carbon dioxide or ammonia.

A refrigerating machine oil composition, comprising:

• a full ester of a diol or a polyol having 3-20 hydroxyl groups with a fatty acid having 6-20 carbon atoms as a base oil;
• at least one oxygen-containing compound selected from the group consisting of
• (A7) Hydrocarbyl ether of dihydric alcohol having 2-20 carbon atoms not including polyalkylene glycol;
• and
• at least one refrigerant selected from the group consisting of HFC refrigerants, perfluoroether, dimethyl ether, hydrocarbon, and mixtures thereof;
• wherein the refrigerating machine oil composition does not comprise carbon dioxide or ammonia.

A refrigerating machine fluid composition, comprising:

• a full ester of a dial or a polyol having 3-20 hydroxyl groups with a fatty acid having 6-20 carbon atoms as a base oil;
• at least one ester additive selected from propyl myristate, methyl stearate, and methyl palmitate;
• at least one compound or additive selected from phosphorus additives and epoxy compounds;
• and
• at least one refrigerant selected from the group consisting of HFC refrigerants, perfluoroether, dimethyl ether, hydrocarbon, and mixtures thereof;
• wherein the refrigerating machine oil composition does not comprise carbon dioxide or ammonia.

A refrigerating machine fluid composition, comprising:

• a full ester of a diol or a polyol having 3-20 hydroxyl groups with a fatty acid having 6-20 carbon atoms as a base oil;
• at least one oxygen-containing compound selected from the group consisting of the following (A3), (A4), and (A5):
• (A3) Trihydric alcohol having 3-20 carbon atoms not including alkylene oxide adduct of a polyhydric alcohol having 3-6 hydroxyl groups,
• (A4) Dihydric alcohol having 2-20 carbon atoms not including polyalkylene glycol, and
• (A5) Hydrocarbyl ether of (A4);
• and
• at least one refrigerant selected from the group consisting of HFC refrigerants, perfluoroether, dimethyl ether, hydrocarbon, and mixtures thereof;
• wherein the refrigerating machine oil composition does not comprise carbon dioxide or ammonia.

A refrigerating machine fluid composition, comprising:

• a full ester of a diol or a polyol having 3-20 hydroxyl groups with a fatty acid having 6-20 carbon atoms as a base oil;
• at least one oxygen-containing compound selected from the group consisting of the following (A4) and (A7):
• (A4) Dihydric alcohol having 2-20 carbon atoms not including polyalkylene glycol, and
• (A7) Hydrocarbyl ether of (A4);
• and
• at least one refrigerant selected from the group consisting of HFC refrigerants, perfluoroether, dimethyl ether, hydrocarbon, and mixtures thereof;
• wherein the refrigerating machine oil composition does not comprise carbon dioxide or ammonia.