C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 5/04 (2006.01) C10M 105/38 (2006.01) C10M 171/00 (2006.01)
Patent
CA 2153388
Refrigeration working fluid compositions are provided herein. Such refrigerant working fluids comprise about 5 to 55 parts by weight of a synthetic polyol ester lubricant and about 95 to 45 parts by weight of 1,1-difluoroethane refrigerant. The ester has a viscosity range of from about 8 cSt to 130 cSt at 40°C and the working fluid has a miscibility value of at least -20°C. In this context, miscibility is defined as the highest temperature at which immiscibility occurs over the composition range of about 10 to 35 parts by weight of the synthetic ester lubricant, and about 90 to 65 parts by weight of the refrigerant. The ester is prepared by reacting: (a) neopentylglycol or trimethylol propane with an acid mixture of branched and linear C7 to C10 alkyl monocarboxylic acids, that acid mixture having a maximum average effective carbon chain length equal to 8.0; or (b) technical grade pentaerythritol with an acid mixture of branched and linear C7 to C10 alkyl monocarboxylic acids, that acid mixture having an average effective carbon chain length of less than 8.0, provided further that when mixtures of linear and branched acids are used with the pentaerythritol, the mixture contains at least 25 wt.% branched acids.
Duncan Carolyn Boggus
Krevalis Martin Anthony
Schlosberg Richard Henry
Borden Ladner Gervais Llp
Exxon Chemical Patents Inc.
Exxonmobil Chemical Patents Inc.
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