Patent ID: 7307118

Claim:
A composition defining an air-liquid interface, said composition comprising: a polymerizable bulk material; and a surfactant having opposed ends, one of which has an affinity for said bulk material and the remaining end having a fluorine component, said surfactant having the following formula: wherein R and R′ are identical or different and selected from the group consisting of H and methyl; wherein R″ is an optional sulfonyl linking group —SO 2 N(R′″″), with R′″″ selected from the group consisting of C 1 to C 6 alkyl; wherein (OR′″) z is a poly(oxyalkylene) group comprising at least one type of oxyalkylene unit; wherein R″″ is a terminal group selected from the group consisting of H, methyl, and C 1 to C 4 alkyl; and wherein the ratio of x to y is in a range of 1:2 to 3:1.