Refrigeration working fluid compositions

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 105/38 (2006.01) C09K 5/04 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2122830

There are disclosed refrigeration working fluid compositions comprising tetrafluoroethane refrigerants and certain polyol esters of C7-C10 branched alkanoic acids or mixtures of such branched acids with linear C7-C10 moroalkanoic acids. The polyols are mono-, di- or technical grade pentaerythritol or trimethylolpropane; the esters exhibit suitable viscosity ranges and miscibility with refrigerants over a broad compositional range. The acids have a defined average effective carbon chain length and a certain degree of methyl branching for polyols other than trimethylolpropane.

L'invention concerne des compositions des fluides actifs de réfrigération comprenant des réfrigérants à base de tétrafluoéthane ainsi que certains esters de polyols d'acides alcanoïques C7-C10ramifiés ou de mélanges desdits acides ramifiés avec des acides monoalcanoïques C7-C10 linéaires. Les polyols sont du mono-, di- pentaérythritol ou trimétrhylolpropane ou de qualité industrielle; les esters présentent des viscosités ainsi qu'une miscibilité appropriée avec des réfrigérants sur une large plage de compositions. Les acides présentent une longueur de chaîne de carbone effective moyenne définie et un certain degré de ramification méthylique pour des polyols autre que le triméthylolpropane.

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