Basf Aktiengesellschaft

Hans Schrimpf

Klaus Pfitzner

Ladislaus Meszaros

Guenter Frey

Gert Liebold

Hans Krebs

The present invention relates to novel silicate-, borate- and nitrate-free antifreeze concentrates based on alkylene glycols or derivatives thereof which include an inhibitor combination essentially comprising salts of carboxylic acids together with hydrocarbon-triazoles and/or -thiazoles. These antifreeze concentrates are, in particular, entirely free from any salts of inorganic acids as corrosion inhibitors. The invention also relates to ready-to-use aqueous coolant compositions comprising these antifreeze concentrates.

Glycol based antifreeze concentrates inhibited with monocarboxylic acid

Aircraft deicing or antiicing compositions

Deicing/antiicing fluids for aircraft which contain essentially glycols, crosslinked polyacrylic acid, a nonionic surfactant based on alkoxylated C.sub.10 -C.sub.20 alcohols, corrosion inhibitors, a mixture of NaOH and KOH, an antioxidant and water, reduce the loss of lift by having improved runoff characteristics from the wings while giving a refreeze holdover time of not less than 30 minutes.

Deicing or antiicing fluids for aircraft

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Mutterstadt, Germany

Hans Schrimpf