Complex esters for use with fluorinated refrigerants
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United States of America Patent
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app pub date -
Sep 30, 2003
filing date -
Apr 11, 1997
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Abandoned
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Abstract
The invention concerns refrigerant compositions which comprise a hydrofluorocarbon based refrigerant and, mixed with the refrigerant, a polyol ester based lubricant. According to the invention the polyol ester comprises a diol having a strongly sterically hindered hydrogen attached to the carbon in position 2, said diol being esterified with a mixture of mono- and diabasic carboxylic acids. In particular the diol is 2-ethyl-1,3-hexanediol or 1,4-dimethylol-cyclohexane. The complex esters in refrigerant mixtures have good lubricant properties and good solubility in HFC compounds.
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