This formulation was designed to provide broad spectrum (SPF/PFA ≤3), label SPF 50 performance. SolaStay® S1 provides very rapid and efficient excited state quenching of Avobenzone, protecting it from photodegradation. HallBrite® BHB contributes to UV filter solubility and enhances product feel. This formulation was subjected to in vitro analysis and delivered SPF ~ 50, PFA ~ 17 performance with critical wavelength 378 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 2.50 | Photostabilizer |
| Homosalate [Homosalate] | 10.00 | UV Filter / Sunscreen Agent | ||
| Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| B | Butyl Methoxydibenzoylmethane [Avobenzone] | 2.50 | UV Filter / Sunscreen Agent | |
| C | VP/Eicosene Copolymer | 2.00 | Film Former | |
| Glyceryl Stearate | HALLSTAR® GMS PURE | 1.20 | Emulsifier | |
| PEG-100 Stearate | HALLSTAR® PEG 4400 MS | 1.00 | Emulsifier | |
| Potassium Cetyl Phosphate, Hydrogenated Palm Glycerides | 2.50 | Emulsifier | ||
| D | Styrene/Acrylates Copolymer (hollow spherical, 325 nm) | 4.50 | SPF Booster | |
| E | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.30 | Thickener (Aqueous) | ||
| F | Preservative | a.n. | Preservative | |
| Glycerin | 3.00 | Humectant | ||
| G | Acrylamide/Sodium Acryloyldimethyltaurate Copolymer, Isohexadecane, Polysorbate 80 | 0.50 | Viscosity Increasing Agent (Aqueous) |
| 1 | To a secondary vessel add phase A, start mixing, add phase B, heat phase AB to 85°C and then add phase C ingredients in order. |
| 2 | When phase ABC is homogenous and phase EF is complete and at 80°C, add phase D to phase ABC and mix well before combining phases. |
| 3 | Add the water from phase E to the main vessel, dissolve Disodium EDTA with continued mixing, then add the Xanthan Gum. |
| 4 | Mix phase E until fully uniform, then start heating it to 80°C and add premix of phase F with continued mixing. |
| 5 | When both phases are homogeneous and at their designated temperatures, slowly add the oil phase ABCD to the water phase EF with prop mixing. After 2 minutes, homogenize for 3 minutes and then return to prop mixing and begin cooling. |
| 6 | When batch is below 50°C, add phase G and continue mixing and cooling until batch is at room temperature. |
| 7 | Replace any water lost to evaporation, mix batch until smooth and perform quality assurance checks. |
| Appearance | Off-White Lotion |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 3600 - 6000 |
| 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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