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Improve the stability of Ewax based emulsion with co-emulsifiers?
As discussed in previous threads I’ve been experimenting with an HLB 8 oil in water emulsion containing benzoyl peroxide, which destabilizes it. Two emulsifiers I’ve tested:
Lotionpro165: Glyceryl Stearate (and) PEG 100 Stearate, is stable without any additional thickeners.Ewax: Cetearyl Alcohol (and) Polysorbate 60, separates after a couple of days at 42C.I’d use lotionpro if it wasn’t for it’s extremely poor absorption, and I don’t want to use gums as they lead to the same issue. Could it work to improve the stability of the ewax formula by adding a low HLB emulsifier? E.g. Glycol Distearate (HLB 1), Glyceryl Stearate (HLB 3.
or Steareth-2 (HLB 4.9)?Or even a pre mixed emulsifier blend such as Polyacrylate 13, Polyisobutene, Polysorbate 20 (Sepiplus 400) or
Acrylates/C10-30 alkyl acrylate crosspolymer (Pemulen TR2)? -
1 Reply
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An interesting example is from Neutrogena on the spot, HLB values in ().
Active: Benzoyl Peroxide (2.5%), Other: Water, Bentonite, Caprylic/Capric Triglyceride (11), Glycerin, Emulsifying Wax Nf, Polysorbate 20 (16.7), Glyceryl Laurate (5.2), Cetyl Dimethicone, Magnesium Aluminum Silicate, Xanthan Gum, Sodium Citrate, Disodium EDTA, Citric Acid, Methylparaben, Propylparaben.They’ve gone a long way to make sure their formula is stable, using two extra co-emulsifiers and two thickeners.
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