Patent ID: 7097705
Filing Date: 2006-08-29
Classification: B01D,B41N,C09B,C09D

Abstract:
1. In a method for applying a coating of a water-based composition to a surface to partially or fully coat the surface, the composition containing an inorganic or organic compound and an effective amount of a surfactant for reducing the dynamic surface tension of the composition, the improvement which comprises employing as the surfactant a mixture of an anionic surfactant and a weak base cationic surfactant having a pK a less than 11.5 and being an amine surfactant selected from the group consisting of where R where R where n is 2–6, m is 0–4, and q is 2–6, and R where the ratio of carbon atoms to nitrogen plus ether and hydroxy oxygen atoms (C:N+O) in the weak base cationic surfactant is 2.5:1 to 10:1, an amount in moles of the mixture demonstrating a dynamic surface tension (DST) which is less than the DST of the same amount in moles of the individual anionic and weak base cationic surfactants, and less than 45 dynes/cm at a concentration of ≦5 wt % in water at 23° C. and 20 bubbles/second or less than 40 dynes/cm at a concentration of ≦0.03M in water at 23° C. and 0.1 bubbles/second according to the maximum-bubble pressure method.