CAVITATION INHIBITING NON-FREEZING COOLING OR HEAT-TRANSFER LIQUIDS AND USE OF A CAVITATION INHIBITING ADDITIVE IN NON-FREEZING COOLING OR HEAT TRANSFER LIQUIDS

摘要

A Cavitation-inhibiting, nonfreezing, cooling and/or heat-transfer liquid, comprising a glycol and a cavitation inhibiting effective amount of at least one phosphonic acid of the formula H2O3P-R-PO3H2 wherein R is phenylene or C1-6-alkylene each optionally substituted by hydroxy, amino or PO3H2 groups, or of the formula wherein R1, R2, and R3 each independently is a C1-4-alkylene group or such a group whose carbon atom chain contains one or more N atoms each of which is attached to one or two groups of the formulae R1-PO3H2, R2-PO3H2 or R3-PO3H2 as defined above.