Patent ID: 6197741
Filing Date: 2001-03-06
Classification: A01N,A61K,A61Q,C11D

Abstract:
A stable concentrated microemulsion composition comprising approximately by weight:(a) 3% to 40% of a negatively charged complex, wherein said negatively charged complex comprises at least one anionic surfactant which is an alkali metal salt or an alkaline earth metal salt of a sulfonate or sulfate surfactant which is complexed with an amine oxide surfactant or a zwitterionic surfactant, wherein the ratio of the anionic surfactant to the amine oxide surfactant or zwitterionic surfactant is 7:1 to 0.2 to 1;(b) 2 to 30% of a cosurfactant;(c) 0.4% to 10% of a chemical compound selected from the group consisting of n-dimethyl para-amine octyl benzoate, benzyl benzoate and an insect repellent containing amide linkages;(d) 18% of at least one dicarboxylic acid;1% of phosphoric acid;(f) 0.2% of an aminoalkylene phosphoric acid;(g) 15% of magnesium sulfate heptahydrate;(h) 0.1% to 10% of a Lewis base, neutral polymer being complexed with the chemical compound wherein the Lewis base, neutral polymer is selected from the group consisting of an ethoxylated polyhydric alcohol, a polyvinyl pyrrolidone polymer and a polyethylene glycol; and(i) the balance being water wherein the composition does not contain ethoxylated nonionic surfactants formed from the condensation product of primary or secondary alkanols and ethylene oxide or propylene oxide, an organic compound containing ester groups, an anionic polycarboxylate polymer, an alkylamine, cyclomethicone, proplyene glycol, linear molecularly dehydrated phosphate salts, N-alkyl aldonamides, and alkylene carbonates.