Tetrahydroquinolines as antioxidants for lubricants

Details Tetrahydroquinolines as antioxidants for lubricants Tetrahydroquinolines as antioxidants for lubricants

C - Chemistry, Metallurgy

10

M

253/136, 253/57

C10M 133/40 (2006.01) C10M 141/00 (2006.01)

Patent

CA 1199623

Tetrahydoquinolines as antioxidants for lubricants Abstract Lubricants can be rendered more resistant to oxidation with the aid of compounds of the formula I Image (I) wherein R1 and R2 independently of one another are each hydrogen, hydroxyl, C1-C18-alkoxy, C3-C4-alkenyloxy, benzyloxy, C1-C18-alkyl or benzyl, R2 is hydrogen or C1-C12-alkyl, or together with R2 it forms a butadienediyl group, and R4 independently of one another are each C1-C18- alkyl, phenyl or benzyl, or R3 and R4 together with the carbon atom to which they are bound form a C5-Cl2-spiro-cycloalkyl ring, R5 is hydrogen or C1-C18-alkyl, and R6 is C1-C18-alkyl, or R5 and R6 together with the two carbon atom to which they are bound are a C5-C12 cycloaliphatic group. In a preferred embodiment, these compounds are combined with a cuctomary phenolic antioxidant.

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