Abstract: A composition of matter is provided comprising a mixture of: (i) at least one alkyl aromatic sulfonamide containing from 6 to 40 carbon atoms total and at least six carbon atoms in the alkyl group; and (ii) at least one polyether aromatic sulfonamide different from (i) and having the following structure: Q—[(OCH(R)CH(R))y—NH—SO2—A]z. Q is selected from the following structures: A is an aromatic group containing from 6 to 39 carbon atoms; L is an alkyl group containing from 1 to 20 carbon atoms or A—SO2—NHCH(CH3)CH2—; R is independently hydrogen or linear or branched alkyl groups having from 1 to 4 carbon atoms; x ranges from 0 to 40; y ranges from 2 to 40; z ranges from 1 to 3; and a ranges from 0 to 40. Also provided is a resinous composition comprising a film-forming material and a plasticizer, where the plasticizer comprises (i) or the mixture of (i) and (ii) above.