Patent ID: 7238645

Claim:
A surfactant system comprising: a) at least one alkoxylated polyarylphenol phosphate ester of the formula (1): wherein R 1 independently is a straight chain or branched C 2 –C 4 alkylene, R 2 is phenyl, aryl or alkylaryl, wherein the phenyl nucleus in R 2 is unsubstituted or substituted by one to three groups selected from the group consisting of C 1 –C 4 alkyl or C 1 –C 4 alkoxy, and R 3 and R 4 are independently selected from the group consisting of hydrogen, sodium, potassium, and m, is 2 or 3, and n is a number from 1 to 150 inclusive, and b) at least one alkoxylated lignosulfonate salt.