Patent ID: 8852449
Filing Date: 2014-10-07
Classification: C10M,C10N

Abstract:
1. A working fluid for a heat transfer device comprising i) CO ii) a polyol ester lubricant composition having a viscosity index of 130 or higher comprising a mixture of esters of formula I wherein n is an integer of from 1 to 20, each R is independently an alkyl carbonyl of from 5 to 10 carbon atoms, each R and wherein from 70% to 100% of all R groups in the mixture of compounds of formula I are selected from isomers of alkyl carbonyl groups of 5 carbon atoms, at least 50% of all groups R in the compounds of formula I present in the working fluid are n-pentanoyl, and wherein the polyol ester lubricant composition ii) comprises: a) from 20 to 45 wt % compounds of formula I wherein n is 1 and each R b) from 15 to 20 wt % compounds of formula I wherein n is 2 and each R c) from 10 to 15 wt % compounds of formula I wherein n is 3 and each R d) from 30 to 55 wt % compounds of formula I which are pentaerythritol oligomers of 4 or more pentaerythritol monomer groups.