Liquid phenolic sulphur-containing antioxidants

Details Liquid phenolic sulphur-containing antioxidants Liquid phenolic sulphur-containing antioxidants

C - Chemistry, Metallurgy

09

K

C09K 15/14 (2006.01) C07C 323/52 (2006.01) C10M 135/26 (2006.01) C10M 159/12 (2006.01)

Patent

CA 2506199

The invention relates to liquid sulphur-containing antioxidants obtainable by reacting at least compound of formula (I) with at least one compound of formula (II) and at least one compound of formula (III) where the variables are as defined in the claims. The invention further relates to compositions comprising them. The novel lubricant compositions comprise the reaction product of a selected group of 5-tert-butyl-4-hydroxy-3-methyl(or tert- butyl)phenyl substituted carboxylic acid esters with thiodiethylene glycol and a mono-hydroxy alcohol with a chain length higher than 4 C-atoms. The novel lubricant compositions are highly resistant to oxidative degradation and are capable of reducing negative effects of deposits, such as black sludge, in motor combustion engines, particularly spark ignition internal combustion engines.

Cette invention se rapporte à des antioxydants contenant du soufre liquide et à des compositions comprenant ces antioxydants. Ce nouveau lubrifiant comprend le produit de la réaction d'un groupe sélectionné d'esters d'acide carboxylique substitué par 5-tert-butyl-4-hydroxy-3-méthyle (ou tert-butyl)phényle avec du thiodiéthylène glycol et un alcool mono-hydroxy ayant une longueur de chaîne de carbone supérieure à quatre atomes de carbone. Ces nouvelles compositions de lubrifiants sont hautement résistantes à la dégradation oxydative et sont capables de réduire les effets négatifs des dépôts, par exemple de boues noires, dans les moteurs à combustion interne, notamment les moteurs explosion.

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