Low viscosity energy efficient polyol-ester based...

C - Chemistry – Metallurgy – 09 – K

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C09K 5/04 (2006.01) C10M 169/04 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2251388

A liquid refrigeration composition is disclosed which comprises (A) at least one-fluorine containing hydrocarbon containing 1 or 2 carbon atoms, further wherein fluorine is the only halogen in said fluorine-containing hydrocarbon; and an effective amount of at least one miscible organic lubricant comprising (B) at least one ester of a carboxylic acid and a polyhydroxy compound characterized by the general formula R[OC(O)R1]n (I) wherein R is a hydrocarbyl group; each R1 is independently (a) hydrogen, (b) a straight chain hydrocarbyl group having from 1 to about 7 carbon atoms, (c) branched chain hydrocarbyl group having from 4 to about 20 carbon atoms, or (d) a straight chain hydrocarbyl group having from 8 to about 14 carbon atoms, provided that when at least one R1 is (d), at least one other R1 is either (a) or (b); n is at least 2; and (C) a performance additive comprising (1) an alkoxylated alcohol or phenol of the formula Image or (2) an alkoxylated glycol of the formula Image wherein R2 is an aliphatic group containing from 1 to 20 carbon atoms or an aromatic or aliphatic substituted aromatic group containing from 6 to 24 carbon atoms, R3 is hydrogen, methyl or ethyl, R13 is a hydroxy alkyl group wherein thealkyl group contains from 2 to 8 carbon atoms, y is an integer of from 1 to 3 and x is an integer of from 2 to 50.

Divulgation d'une composition frigorigène liquide comprenant : A) au moins un hydrocarbure fluoré en C1-C2, dans lequel le fluor est le seul halogène présent; B) une quantité efficace d'au moins un lubrifiant organique miscible renfermant au moins un ester carboxylique de polyol de formule générale R¢OC(O)R1!n (I); et C) un additif de performance renfermant (1) un alcool alcoxylé ou un phénol de formule Image ou (2) un glycol alcoxylé de formule Image , dans laquelle R2 est un groupement aliphatique en C1-C20 ou un groupement aromatique ou aliphatique substitué en C6-C24, R3 est un atome d'hydrogène, un méthyle ou un éthyle, R13 est un groupement hydroxyalkyle en C2-C8, y est un nombre entier allant de 1 à 3 et x est un nombre entier allant de 2 à 50. Dans la formule (I), R représente un groupement hydrocarbyle, chaque R1 représente, de manière indépendante, (a) un atome d'hydrogène, (b) un groupement hydrocarbyle linéaire en C1-C7, (c) un groupement hydrocarbyle ramifié en C4-C20 ou (d) un groupement hydrocarbyle linéaire en C8-C14, à la condition qu'au moins un des R1 soit de type (d), qu'au moins un des R1 soit de type (a) ou de type (b), et que n soit au moins égal à 2.

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