Use of esters comprising branched alkyl groups as lubricants

Details Use of esters comprising branched alkyl groups as lubricants Use of esters comprising branched alkyl groups as lubricants

C - Chemistry, Metallurgy

10

M

C10M 105/34 (2006.01) C07C 63/34 (2006.01) C07C 69/003 (2006.01) C07C 69/24 (2006.01) C07C 69/36 (2006.01) C07C 69/38 (2006.01) C07C 69/40 (2006.01) C07C 69/42 (2006.01) C07C 69/44 (2006.01) C07C 69/46 (2006.01) C07C 69/48 (2006.01) C07C 69/50 (2006.01) C10M 105/36 (2006.01) C10M 129/70 (2006.01) C10M 129/72 (2006.01)

Patent

CA 2637401

Disclosed is the use of esters which comprise branched alkyl groups and represent reaction products of alcohols of general formula (I) R1OH, wherein R1 represents a branched alkyl radical containing 10 to 40 C atoms, with a) aliphatic dicarboxylic acids of general formula (II) HOOC-R2-COOH, wherein R2 represents a branched or linear, saturated alkyl radical containing 0 to 34 C atoms, or b) saturated monocarboxylic acids of general formula (III) R3-COOH, wherein R3 represents a branched alkyl radical composed of 3 to 39 C atoms, or c) saturated monocarboxylic acids of general formula (III), wherein R3 represents a linear alkyl radical composed of 3 to 29 C atoms, or d) a mixture of at least two of said acid groups a) to c), as lubricants, provided that the esters comprising branched alkyl groups have an oxidation resistance of at least 1000 hours in an oxidation resistance test (e.g. according to DIN EN ISO 4263-3) and are compatible with sealing materials (e.g. according to ASTM D 471). Also disclosed are lubricants containing the inventive esters that comprise branched alkyl groups at amounts of 0.1 to 99.5 percent by weight relative to the total amount of lubricant.

La présente invention concerne l'utilisation d'esters comprenant des groupes alkyle modifiés, qui sont des produits de la réaction d'alcools de formule générale (I) R1OH, dans laquelle R1 est un radical alkyle ramifié comprenant de 10 à 40 atomes de C, avec : a) des acides dicarboxyliques aliphatiques de formule générale (II) HOOC-R2-COOH, dans laquelle R2 est un radical alkyle saturé, ramifié ou non, comprenant de 0 à 34 atomes de C ; ou b) des acides monocarboxyliques saturés de formule générale (III) R3-COOH, dans laquelle R3 est un radical alkyle ramifié comprenant de 3 à 39 atomes de C ; et c) des acides monocarboxyliques saturés de formule générale (III) dans laquelle R3 est un radical alkyle linéaire comprenant de 3 à 29 atomes de C ; ou d) un mélange d'au moins deux groupes acides mentionnés a)-c). Ces esters sont employés comme lubrifiants à la condition qu'ils aient une stabilité à l'oxydation supérieure ou égale à 1000 heures dans le cadre du test relatif à la stabilité à l'oxydation (par exemple selon DIN EN ISO 4263-3), et une certaine tolérance aux matériaux d'étanchéité (par exemple selon ASTM D 471). L'invention concerne aussi des lubrifiants qui contiennent les esters mentionnés en des quantités de 0,1 à 99,5 % en poids rapportés à la quantité totale de lubrifiant.

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