Basf Aktiengesellschaft

Naphtachimie

Jacques Lonchampt

Bernd Wenderoth

Ralf Strauss

Marcel J Tucoulat

Antifreeze concentrates are based on a mixture of at least two different C - to C -dicarboxylic acids, molybdate and a mixture of at least two different triazoles or thiazoles.

Antifreeze concentrates based on dicarboxylic acids, molybdate and triazoles or thiazoles, and coolant compositions comprising them

PCT No. PCT/FR78/00008 Sec. 371 Date Mar. 22, 1979 Sec. 102(e) Date Mar. 22, 1979 PCT Filed July 10, 1978 The invention concerns a process for preventing the formation of deposits on the walls of the heating or cooling circuits of heat exchangers in which an aqueous heat-exchange liquid circulates. This process comprises mixing with the heat-exchange liquids from about 0.3 to about 5% by weight of a product of polyaddition of ethylene oxide and propylene oxide on a monohydric alcohol, water, a diol or a triol, the ethylene oxide representing from 60% to 90% by weight of the fixed alkylene oxides. This process can be used in particular in internal combustion engine cooling circuits.

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Montbeliard, France

Jacques Lonchampt