Basf Aktiengesellschaft

Klaus Pfitzner

Ladislaus Meszaros

Hans Schrimpf

Michael Gillich

Heinrich Hartmann

Knut Oppenlaender

Friedrich Linhart

Knut Oppenlander

Knut Oppenl&auml;nder

Charalampos Gousetis

Wolfgang Gunther

Fritz Brunnmueller

Wolfgang G&uuml;nther

Michael Kroner

Gert Liebold

Juergen Dehler

Antifreeze concentrates and coolant compositions containing these concentrates for cooling circuits in internal combustion engines

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

Use of quaternized imidazoles as corrosion inhibitors for non-ferrous

Aircraft deicing or antiicing compositions

Phosphate-containing, glycol-based coolant mixtures which are stable in hard water and are free of nitrites, silicates, amines and borates contain

Phosphate containing coolant mixtures which are stable in hard water

Organosilane/silicate copolymers obtainable by reacting an organic phosphosilicon compound of the formula I ##STR1## where n, X, Y, R.sup.1 and R.sup.2 have the meanings stated in the description, with an alkali metal silicate, radiator antifreezes containing these compounds, their use as corrosion inhibitors in radiator antifreezes based on glycol, a method of inhibiting corrosion of aluminum by aqueous cooling media, containing radiator antifreeze based on glycol, during the cooling of internal combustion engines, and the use of organic phosphosilicon compounds for stabilizing silicates.

Phosphosilicone/silicate copolymers and their use as corrosion

Linear, basic polymer powders which contain units of the formula ##STR1## and have a Fikentscher K value of from 10 to 200 are prepared by eliminating the formyl groups from N-vinylformamide polymer powders with a gaseous hydrogen halide in the presence of not more than 5% by weight, based on the polymer used, of water.

Preparation of linear, basic polymer powders

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Ludwigshafen, Germany

Klaus Pfitzner