Patent ID: 7001634

Claim:
A process for suppressing the foaming of an aqueous system comprising: combining: A) water; and B) at least one defoamer composition comprising the reaction product of: i) at least one starter compound which has active hydrogen atoms; and ii) at least one alkylene oxide chosen from ethylene oxide, propylene oxide, butylene oxide and a mixture or mixtures thereof; wherein i) and ii) have been reacted in the presence of at least one catalyst and wherein the defoamer has a hydroxyl equivalent molecular weight of at least 4000 Da and a cloud point less than or equal to 30° C. in 1% aqueous solution, and wherein propylene oxide is present in the defoamer in an amount within the range of from about 70 to about 90 wt. %, based on the total weight of the defoamer and ethylene oxide is present in the defoamer in an amount within the range of from about 10 to about 30 wt. %, based on the total weight of the defoamer.