Organophosphate and silicate containing antifreeze

Claim 1

An antifreeze composition concentrate comprising: (a) alcohol, (b) at least one buffer selected from the group consisting of salts of boric, phosphoric benzoic, substituted benzoic, dibasic acids having 6 to 20 carbon atoms, and mixtures thereof, (c) at least one alkylene oxide-containing organophosphate, in a corrosion inhibiting-effective amount, wherein said organophosphate has a molecular weight below about 10,000 and is selected from the group defined by the following structural formulae I, II and III: ##STR4## wherein R'=[RO(PO) x (EO) y ] wherein R=H or alkyl, aryl, alkylaryl, arylalkyl, alkenyl or alkynyl having up to 24 carbon atoms, PO=Propylene oxide radical, EO=Ethylene oxide radical, x=1 to 100, y=0 to 100, k=1 to 3, with the proviso that when k=3, at least one R' group is removed from the phosphate ester by hydrolysis prior to or during use, n=1 to 100, w=0 to 100, with the proviso that when w≧1, x can be zero, z=0 to 100 m=1 to 10, and (d) at least one silicate selected from the group consisting of organic and inorganic silicates, and mixtures thereof.