| abstract |
The present invention discloses a composition comprising a lubricant and a refrigerant, wherein the lubricant comprises a polyoxyalkylene glycol derivative of formula (I): R x (R a O) x (R b O) y (R c O ) z R d , wherein: X is O or S, R is a C 3 to C 15 substituent comprising a heterocyclic ring, the heteroatoms of the ring are oxygen and / or sulfur, and R a is C 2 alkyl R b is a C 3 alkylene group, R c is a C 4 alkylene group, R d is the same as R, or H, C 1 -C 20 alkyl or C 1 -C 20 acyl, x, y and z are each independently an integer of 0 or less than or equal to 100 and x + y + z = 4 to 100, but excludes compositions wherein the refrigerant is halogen-free and R contains carbonate groups. The use of borate esters as a dehydrating agent in connection with the lubricant is also disclosed. |