Glycol antifreeze mixtures

摘要

A glycol-based antifreeze formulation containing as a defoaming agent, from 0.001% to about 1.0% by weight of the reaction product of a polyglycerol having from 5 to 30 glycerol units, and a glycidyl ether having the formula <IMAGE> wherein n is an integer from 1 to 20, R is hydrogen, methyl or ethyl, and Z is an alkyl group having from 1 to 8 carbon atoms or the group having the formula <IMAGE>