The use of copolymers containing structural units derived from the compounds of the formulae 1 and 2 ##STR1## in which R.sup.1 and R.sup.2 are H, C.sub.1 -C.sub.4 alkyl or, with inclusion of the N--CO-- group, form a ring of 5, 6, 7 or 8 ring atoms which in addition to the N--CO-- group, may include further heteroatoms, R.sup.3 is H or C.sub.1 -C.sub.4 alkyl, R.sup.4 is a branched or unbranched C.sub.1 -C.sub.6 alkylene radical, and Y is an alkali metal or ammonium in amounts of from 0.01 to 2% by weight to prevent misting in water-based cooling lubricants.

O uso dos copolymers que contêm as unidades estruturais derivadas dos compostos do STR1 das fórmulas 1 e 2 ## do ## em que R.sup.1 e R.sup.2 são H, C.sub.1 - o alkyl C.sub.4 ou, com inclusion do N -- co -- grupo, dê forma a um anel de 5, 6, 7 ou 8 átomos do anel que além ao N -- co -- grupo, pode incluir uns heteroatoms mais adicionais, R.sup.3 é H ou C.sub.1 - o alkyl C.sub.4, R.sup.4 é um C.sub.1 ramificado ou unbranched - o radical do alkylene C.sub.6, e o Y é um alkali-metal ou um ammonium nas quantidades de 0.01 a 2% pelo peso para impedir misting em lubrificantes refrigerando water-based.

 
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