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

摘要

The subject of the invention is an etherpyrrolidone carboxylic acid of the formula (1); ;in whichR¹ is a C₁-C₆ hydrocarbon group with 1-4 oxy groupsR² is H, CH₃, CH₂CH₃ (A-O) is a (poly)alkylene glycol unit containing one or more C₂-C₄ alkoxy groups or a mixture of plural C₂-C₄ alkoxy groups, at least one alkoxy group being a butoxy or propoxy groupM is hydrogen, alkali metal, alkaline earth metal or an ammonium groupy is 1 or 2x is 1, 2, 3 or 4.