C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
31/35
C23F 11/14 (2006.01)
Patent
CA 1150044
CORROSION INHIBITED ALCOHOL COMPOSITIONS Abstract of the Invention Corrosion inhibited alcohol compositions can be prepared which are suitable for use as anti-freeze composi- tions in the cooling systems of internal combustion engines. The alcohol is selected from at least one of the group consisting of methanol, ethanol, propanol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and glycerol. The corrosion inhibitor comprises an effective amount of a conventional corrosion inhibitor selected from the group consisting of the alkali metal carbonates, borax, the alkali metal dichromates, the alkali metal silicates, phosphorous acid, phosphoric acid, an alkali metal tungstate, benzotriazole, tolyltriazole, an alkali metal salt of benzoic or toluic acid, an alkali metal salt of a phenol, an alkanolamine and an organo-silicone compound in addition to an alkanolamine phosphate and a heterocyclic nitrogen-con- taining compound. The phosphate is the reaction product of an alkanolamine and phosphoric acid. The heterocyclic nitrogen-containing compound has the formula: Image wherein R1 is individually selected from hydrogen or a monovalent radical selected from the group consisting of a straight or branched chain monovalent alkyl of 1 to 18 carbon atoms, a monovalent cycloalkyl or alkoxy having up to 18 carbon atoms, a monovalent alkylene of 1 to 18 carbon atoms, monovalent aryl, monovalent alkylaryl having 1 to 18 carbon atoms in the alkyl portion thereof or wherein each R1 is combined into a single divalent alkyl radical having 2 to 18 carbon atoms, wherein R2 is a divalent radical selected from the group consisting of at least one of alkyl and alkoxy radicals having 2 to 18 carbon atoms and where alkoxy can be derived from polymerization of at least one alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran; and wherein M is an alkali metal.
360152
Eisenstein Stephen E.
Hirozawa Stanley T.
Maxwell Jerrold F.
Wilson Joe C.
Basf Wyandotte Corporation
Robic Robic & Associes/associates
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