This formulation was designed to provide broad spectrum (SPF/PFA <3) label SPF 20 performance. SolaStay® S1 provides very rapid and efficient excited state quenching of Avobenzone, protecting it from photodegradation. SolaStay® S1 also mitigates the photocatalytic and reactive oxygen species generating activities of the oxide to improve sunscreen performance. HallBrite® BHB contributes to UV filter solubility and enhanced product feel. This formulation was subjected to in vitro analysis and delivered SPF ~23, PFA (PPD) ~8, performance with critical wavelength 378 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 1.50 | Photostabilizer |
| Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
| Homosalate [Homosalate] | 10.00 | UV Filter / Sunscreen Agent | ||
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| B | Titanium Dioxide [Titanium Dioxide], Aluminum Hydroxide (60 nm primary particle size) | 2.00 | 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 | 1.20 | Emulsifier | |
| PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 1.20 | Emulsifier | |
| Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 2.20 | Emulsifier | ||
| D | Butyl Methoxydibenzoylmethane [Avobenzone] | 1.50 | UV Filter / Sunscreen Agent | |
| 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 |
| 1 | In secondary vessel add phase A and start mixing. Slowly add phase B to phase A with continued mixing and begin heating to 85°C. |
| 2 | After TiO2 is dispersed, add phase C ingredients to phase AB with mixing, then add phase D to phase ABC and mix until homogenous. |
| 3 | Add the water from phase E to the main vessel, dissolve Disodium EDTA with continued mixing and then add Xanthan Gum, stirring until fully incorporated. Start heating phase E to 80°C and add premix of phase F to phase E. |
| 4 | When both phases are homogeneous and at their designated temperatures, slowly add the oil phase ABCD to the water phase EF with prop mixing. Homogenize for 3 minutes, return to prop mixing and continue to cool and mix until batch is at room temperature. |
| 5 | Replace any water lost to evaporation, mix batch until smooth and perform quality assurance checks. |
| Appearance | Off-White, thick lotion |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 2500 - 4100 |
| 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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