Patent ID: 6475405
Filing Date: 2002-11-05
Classification: C09K,C10M,C10N

Abstract:
A method for effecting lubrication in compression-type refrigerators using 1,1,1,2-tetrafluoroethane as a refrigerant which comprises employing, as a lubricant, a lubricating oil comprising, as a main component, a polyoxyalkyleneglycol derivative of ethyleneoxide-propyleneoxide copolymer represented by the general formula:R6â€”Oâ€”Aâ€”R7 or the general formula:[CH2â€”Oâ€”Aâ€”R8 CHâ€”Oâ€”Aâ€”R9 CH2â€”Oâ€”Aâ€”R10]wherein R6, R7, R8, R9 and R10 are each an alkyl group having 1 to 3 carbon atoms, A is a copolymerization chain of ethyleneoxide and propyleneoxide, consisting of p-times ethyleneoxide units and q-times propyleneoxide units and p and q are numbers satisfying the requirements:0.1&lE;p/q&lE;10, 5&lE;p+q&lE;100.