Patent ID: 7264885

Claim:
A solid hydrophobic surface wetted with an aqueous solution comprising a combination of an ethenoxylated alcohol surfactant and an N-alkyl-2-pyrrolidinone surfactant, wherein: the N-alkyl-2-pyrrolidinone surfactant contains an N-alkyl group having a minimum of eight carbon atoms; the ethenoxylated alcohol surfactant contains a hydrocarbon chain having a minimum of six carbon atoms; the minimum total amount of the ethenoxylated alcohol surfactant and the N-alkyl-2-pyrrolidinone surfactant is about 0.01 percent by weight of the aqueous solution and the maximum total amount of the ethenoxylated alcohol surfactant and the N-alkyl-2-pyrrolidinone surfactant is about 1.0 percent by weight of the aqueous solution; and the N-alkyl-2-pyrrolidinone surfactant and the ethenoxylated alcohol surfactant are present in the aqueous solution in an amount that causes a synergistic increase in the spreading factor on the solid hydrophobic surface.