This formulation yields a broad spectrum (SPF/PFA ≤3) sunscreen cream. SolaStay® S1 is incorporated to mitigate the photocatalytic and reactive oxygen species generating activities of Titanium Dioxide and to rapidly and efficiently quench the excited states of Avobenzone. This product was subjected to in vitro analysis and delivered SPF ~55, PFA (PPD) ~30 performance with critical wavelength 379 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 3.00 | Photostabilizer |
| Homosalate [Homosalate] | 10.00 | UV Filter / Sunscreen Agent | ||
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
| B | Titanium Dioxide [Titanium Dioxide], Aluminum Hydroxide (60 nm primary particle size) | 2.10 | UV Filter / Sunscreen Agent | |
| C | Cetearyl Alcohol | HALLSTAR® TA-1618 CETEARYL ALCOHOL | 0.50 | Emulsion Stabilizer |
| VP/Eicosene Copolymer | 1.00 | Film Former | ||
| Glyceryl Stearate | HALLSTAR® GMS PURE | 1.60 | Emulsifier | |
| PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 1.20 | Emulsifier | |
| Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 2.20 | Emulsifier | ||
| D | Butyl Methoxydibenzoylmethane [Avobenzone] | 4.00 | null | |
| E | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.20 | Thickener (Aqueous) | ||
| F | Preservative | a.n. | Preservative | |
| Glycerin | 3.00 | Humectant | ||
| G | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Phenylbenzimidazole Sulfonic Acid [Ensulizole] | 1.50 | UV Filter / Sunscreen Agent | ||
| Sodium Hydroxide (10% aqueous) | 2.15 | pH Adjuster |
| 1 | In secondary vessel combine phase A and start mixing. Slowly add phase B to phase A with continued mixing and fully disperse. |
| 2 | Heat phase AB to 85°C and then add phase C items to it in order with mixing. When homogenous, add phase D to phase ABC with mixing. |
| 3 | Add the water from phase E to the main vessel, dissolve the Disodium EDTA with continued mixing and then add Xanthan Gum, stirring until fully incorporated before continuing. Then start heating phase E to 80°C and add premix phase F to it. |
| 4 | Make phase G solution, bringing its pH to 7.5 - 8.0 by adjusting the Sodium Hydroxide level as needed, and then add it to phase EF. |
| 5 | When both phases are homogeneous and at their designated temperatures, slowly add the oil phase ABCD to the water phase EFG with prop mixing. Homogenize for 3 minutes, then resume prop mixing and cool with mixing until batch is at room temperature. |
| Appearance | Pale Yellow Cream |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 14000 - 24000 |
| pH | 6.0 - 7.0 |
*Patented and Patent Pending
The information presented herein is believed to be accurate and reliable, but no warranty or guarantee, expressed or implied, is made regarding the information or the performance of any product. Further, nothing contained herein shall be taken as any inducement or recommendation to use, manufacture or sell that may infringe any patents or any other proprietary rights now or hereafter in existence, nor to imply compliance with any regulatory requirements
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