Michael Adduct Amino Esters As Total Base Number Boosters For Marine Diesel Engine Lubricating Compositions

摘要

A lubricating composition suited to use in a marine diesel engine includes an oil of lubricating viscosity and an amino carboxylate compound of formula (I): NR¹R²—((CHR³)_xNR⁴)_n—(CHR⁵)₂—COY, where R¹ and R² are independently selected from —(CHR⁶)₂—COY′, H, and C₁C₃ alkyl and wherein at least one of R¹ and R² is —(CHR⁶)₂—COY′; or wherein NR¹R² is a cyclic structure; Y and Y′ are independently selected from —OR⁴, NHR⁷, and —N(R⁷)₂; each R⁷ is independently selected from C₆-C₁₂ alkyl and C₆-C₁₂ alkenyl; R³, R⁵ and R⁶ are independently selected from H and C₁-C₄ alkyl; R⁴ is selected from H, C₁-C₄ alkyl, and (CHR³)_xNH₂; x is from 2 to 4; and n is at least 1, except where NR¹R² is a cyclic structure, where n is at least 0.