Patent ID: 7122060

Claim:
A composition of matter comprising: at least one anionic surfactant comprising at least one phosphate group, wherein the anionic surfactant is represented by the formula: wherein R H is C n H 2n+1 wherein n ranges from 1 to 24 or C n F 2n+1 (CH 2 ) m wherein n ranges from 1 to 24 and m ranges from 1 to 24; wherein R F is C n F 2n+1 (CH 2 ) m wherein n ranges from 1 to 24 and m ranges from 1 to 24; and wherein M is selected from the group consisting of K + , Na + , and NR 4+ , wherein R is selected form the group consisting of H, CH 3 , C 6 H 5 , or a combination thereof; and a solvent comprising liquid or supercritical carbon dioxide, wherein at least a portion of the surfactant is soluble in the solvent.