DMS (derma membrane structure) in foam creams
The invention relates to a foam formulation comprising an emulsion, comprising an oil phase and a water phase, the oil phase comprising at least one membrane-forming substance forming a lamellar membrane in the foam formulation.
1 . A foam formulation comprising an oil-in-water emulsion which comprises an oil phase and a water phase, wherein the oil phase comprises membrane-forming substances that form a lamellar membrane within the emulsion, said membrane-forming substances comprising at least one phospholipid and at least one lipid selected from the group consisting of a triglyceride and a liquid wax ester, wherein the formulation contains less than 1.5% by weight of amphiphilic, micelle-forming compounds having a molecular weight of less than 5000, and wherein said lamellar membrane is characterized by the presence of Maltese crosses when viewed under a polarization microscope.
2 . The foam formulation of claim 1 , wherein the at least one phospholipid is hydrogenated lecithin and the triglyceride is a caprylic/capric acid triglyceride.
3 . The foam formulation of claim 1 , wherein the at least one phospholipid comprises a mixture of lecithin and hydrogenated lecithin.
4 . The foam formulation of claim 1 , wherein the at least one lipid is a liquid wax ester comprising isopropyl myristate.
5 . The foam formulation of claim 1 , wherein the weight ratio of the at least one phospholipid to the at least one lipid is from 1:5 to 1:1.
6 . The foam formulation of claim 1 , further comprising at least one thickening agent selected from the group consisting of hydroxypropylmethyl cellulose and xanthan gum.
7 . The foam formulation of claim 1 , further comprising a stabilizer comprising pentylene glycol.
8 . The foam formulation of claim 1 , further comprising one or more components selected from the group consisting of shea butter, squalane, and ceramide 3.
9 . The foam formulation of claim 1 , wherein the membrane-forming substances have an HLB value between 9 and 11.
10 . The foam formulation of claim 1 , wherein the formulation is a foam cream.