Hydroxybenzoic acid as pH buffer and corrosion inhibitor for antifreeze containing organosilicone-silicate polymers

Claim 1

A single-phase antifreeze and coolant concentrate consisting essentially of an alcohol selected from the group consisting of methanol, ethanol, propanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and glycerol, an organosilicone-silicate polymer corrosion inhibitor and a hydroxybenzoic acid pH buffer and corrosion inhibitor composition capable of buffering the pH in the range of above about 9 to about 11, wherein said pH buffer is selected from the group consisting of ortho hydroxybenzoic acid, para hydroxybenzoic acid, and mixtures thereof and is present in the amount of about 0.1 to about 1.5 percent by weight based upon the weight of said antifreeze, wherein said organo-silicone-silicate polymer corrosion inhibitor is present in an amount of 0.01 percent to 10 percent by weight of said concentrate, and wherein said polymer consists essentially of: (A) from 10 to 90 parts by weight of siloxane groups represented by the formula: ##EQU4## wherein M is a cation that forms a water-soluble silicate selected from the group consisting of the sodium, potassium, lithium, rubidium and tetra(alkyl)ammonium cations, a is the valence of the cation represented by M and is an integer having a value of at least one, R is a member selected from the group consisting of the unsubstituted divalent hydrocarbon groups, M.sub.1/a OCC substituted divalent hydrocarbon groups, each M.sub.1/a OCC group is connected to the silicon atom through at least 2 carbon atoms of the group represented by R, R 1 is a monovalent hydrocarbon group, b is an integer having a value from 1 to 3 inclusive, c is an integer having a value from 0 to 2 inclusive and (b+c) have a value from 1 to 3 inclusive and (B) from 10 to 90 parts by weight of groups represented by the formula: ##EQU5## wherein M and a have the above-defined meanings and d is an integer having a value from 1 to 3 inclusive, said parts by weight of said groups being based on 100 parts by weight of the organosilicone-silicate polymer.