POLYALKYLENE GLYCOL-BASED ETHER PYRROLIDONE CARBOXYLIC ACIDS, AND CONCENTRATES FOR THE PRODUCTION OF SYNTHETIC COOLING LUBRICANTS CONTAINING THE SAME

摘要

The invention relates to ether pyrrolidone carboxylic acids of formula (1), wherein R1 represents a C1-C6-hydrocarbon group containing 1 to 4 oxy groups, R2 represents H, CH3, CH2CH3, (A-O) represents a (poly)alkylene glycol unit containing one or more C2-C4-alkoxy groups or a mixture of several C2-C4-alkoxy groups, wherein at least one alkoxy group is a butoxy or propoxy group, M represents hydrogen, alkali metal, alkaline earth metal, or an ammonium group, y is 1 or 2, and x is 1, 2, 3, or 4.