| abstract |
Gellation resistant aqueous glycol compositions useful as antifreeze compositions are disclosed containing silicates together with other corrosion inhibitors. The silicates are added to the glycol compositions after the other additives have been added and after the composition has been adjusted to a pH range of 7-12. The gellation resistance is obtained or enhanced by the addition of an effective amount of the hydrolyzate of organo-phosphorous-silicon compounds having the formula (RO)3Si(CH2)n-O-P(O)(CH3)-OR wherein R is an alkyl group of 1-4 carbon atoms, and n is an integer of 1-4, A method of improving the gellation resistance of aqueous glycol compositions is also disclosed which comprises adding an effective amount of the above hydrolyzate to the corrosion resistant glycol compositions before or during the silicate addition. |