Patent ID: 6677284
Filing Date: 2004-01-13
Classification: C10M,C10N

Abstract:
In a fluid composition for use in compression refrigeration including an ammonia refrigerant and a hydrocarbon lubricant, wherein the improvement comprises adding from about 1 to about 20 weight percent, based on the weight of the hydrocarbon lubricant, of a polyether being the reaction product of a ring opening polymerization of an alkylene oxide of 2 to 5 carbon atoms from a compound Z having from 1 to 8 active hydrogens, wherein Z has a minimum of 6 carbon atoms when Z includes an aryl and a minimum of 10 carbon atoms when Z is aliphatic unless the polyether has at least 50 weight percent repeating units derived from polymerizing 1,2-butylene oxide, in which case Z can also be an aliphatic group of 1 to 9 carbon atoms.