This formulation was designed to provide broad spectrum (SPF/PFA <3), label SPF 30 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 and HallTress® DIBA Special contribute to UV filter solubility and enhance product feel while liquid crystal making self-emulsifier Olivem® 1000 contributes to a stable emulsion while imparting sensorial and physiological benefits. This formulation was subjected to in vitro analysis and delivered SPF ~35 , PFA (PPD) ~12 performance with critical wavelength 380 nm.
| Phase | INCI Name [INN/USAN] (Other Information) | Trade Name | % Wt | Function |
|---|---|---|---|---|
| A | Ethylhexyl Methoxycrylene | SolaStay® S1* | 2.00 | Photostabilizer |
| Ethylhexyl Salicylate [Octisalate] | 5.00 | UV Filter / Sunscreen Agent | ||
| Diisobutyl Adipate | HALLTRESS® DIBA SPECIAL | 5.00 | Sunscreen Solvent | |
| Butyloctyl Salicylate | HALLBRITE® BHB* | 5.00 | Sunscreen Solvent / Emollient | |
| B | Ethylhexyl Triazone | 1.15 | UV Filter / Sunscreen Agent | |
| Titanium Dioxide [Titanium Dioxide], Aluminum Hydroxide (60 nm primary particle size) | 4.00 | 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 | 1.50 | Emulsifier | |
| Cetearyl Olivate, Sorbitan Olivate | OLIVEM® 1000 | 3.00 | Self-Emulsifier / Liquid Crystal Maker | |
| D | Butyl Methoxydibenzoylmethane [Avobenzone] | 2.50 | UV Filter / Sunscreen Agent | |
| E | Water (Aqua) (deionized) | up to 100 | Volatile Carrier | |
| Disodium EDTA | 0.05 | Chelating Agent | ||
| Xanthan Gum (pharma grade) | 0.30 | Thickener (Aqueous) | ||
| F | Preservative | a.n. | Preservative | |
| Glycerin | 3.00 | Humectant |
| 1 | To a secondary vessel add phase A and start mixing. Disperse phase B in phase A with continued mixing. |
| 2 | Heat phase AB to 85°C and then add phase C ingredients in order with mixing. |
| 3 | Add phase D to phase ABC, mixing well until phase D is fully dissolved. |
| 4 | Add water of phase E to the main vessel, dissolve Disodium EDTA and, with continued mixing, add Xanthan Gum, mixing until fully incorporated. |
| 5 | Start heating phase E to 80°C and add premixed phase F. |
| 6 | When both phases are homogeneous and at their designated temperatures, slowly add oil phase ABCD to water phase EF with prop mixing. |
| 7 | Homogenize combined phases for 3 minutes and then resume prop mixing and start cooling batch to room temperature. |
| 8 | When batch is at room temperature, replace any water lost to evaporation and mix until batch is smooth. |
| Appearance | Pale yellow lotion |
| Viscosity (Brk, RVDV-II, T-D, 20 rpm, after 24 h at room temperature; mPa·s) | 3500 - 6000 |
| pH | 5 - 6 |
*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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